WO2024084934A1 - 回転電機用ステータ - Google Patents
回転電機用ステータ Download PDFInfo
- Publication number
- WO2024084934A1 WO2024084934A1 PCT/JP2023/035862 JP2023035862W WO2024084934A1 WO 2024084934 A1 WO2024084934 A1 WO 2024084934A1 JP 2023035862 W JP2023035862 W JP 2023035862W WO 2024084934 A1 WO2024084934 A1 WO 2024084934A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- slot
- coil
- stator
- slot insertion
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
- H02K3/505—Fastening of winding heads, equalising connectors, or connections thereto for large machine windings, e.g. bar windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
Definitions
- This disclosure relates to a stator for a rotating electric machine.
- a technology is known in which one end of each of the multiple coil pieces that form the stator coil is positioned on the outermost side of the stator core within the slot, and the other end is positioned on the innermost side of the stator core within the slot.
- the present disclosure aims to reduce the axial size of the stator while increasing the number of parallel coil sections for each phase to four or more.
- a stator coil in which coil portions for each phase are connected in four or more parallel circuits between a neutral terminal and a power line terminal for each phase; a stator core having a plurality of slots and around which the stator coil is wound; The stator coil is a slot insertion portion to be inserted into each corresponding slot among the plurality of slots; a bridge portion that is exposed from an axial end surface of the stator core and extends in a circumferential direction in a manner to connect between the pair of slot insertion portions,
- a stator for a rotating electric machine is provided in which, in each phase, a first slot insertion portion among the multiple slot insertion portions in each of the four or more sets, which is directly connected to the power line terminal, is located on one axial side of the stator core, on the outermost diameter side of the corresponding slot.
- this disclosure makes it possible to reduce the axial size of the stator while allowing the number of coil parts in parallel for each phase to be four or more.
- FIG. 1 is a plan view of a rotating electric machine (stator) according to an embodiment of the present invention
- FIG. 2 is a circuit diagram of a three-phase coil in a Y-connection according to the present embodiment.
- FIG. 2 is a perspective view of a stator according to the present embodiment.
- FIG. 2 is a side view of the stator according to the present embodiment.
- FIG. 2 is a top view of the stator according to the present embodiment.
- 3A to 3C are diagrams for explaining the configuration of coil pieces that form a stator coil.
- FIG. 2 is a diagram showing the configuration of a U1 coil of a U-phase coil.
- FIG. 4 is a diagram showing the configuration of a U2 coil of a U-phase coil.
- FIG. 1 is a plan view of a rotating electric machine (stator) according to an embodiment of the present invention
- FIG. 2 is a circuit diagram of a three-phase coil in a Y-connection according to the present embodiment.
- FIG. 4 is a diagram showing the configuration of a U3 coil of a U-phase coil.
- FIG. 4 is a diagram showing the configuration of a U4 coil of a U-phase coil.
- FIG. 4 is a diagram showing the arrangement of each terminal of a U-phase coil.
- 13 is a diagram for explaining a second transition portion that connects the slot insertion portions of the first turns on the radially outermost side.
- FIG. 13 is a diagram for explaining a third transition portion that connects the slot insertion portions of the eighth turns on the radially innermost side.
- FIG. FIG. 13 is a perspective view of a stator according to a comparative example.
- FIG. 1 is a plan view of a rotating electric machine (stator) according to this embodiment.
- axial direction refers to the direction along the axis (symbol O) of the stator core 10 (rotor 150) (Z direction: see FIG. 1).
- Z direction refers to the Z1 direction side
- the other side is the Z2 direction side.
- Cyrcumferential direction refers to the circumferential direction (A direction) of the stator core 10.
- A1 direction One side of the circumferential direction
- A2 direction One side of the circumferential direction
- Radial direction refers to the radial direction (B direction) based on the axis of the stator core 10 (rotor 150).
- dial inner side and “inner diameter side” refer to the direction toward the center of the stator core 10 (B1 direction).
- “Radial outer side” and “outer diameter side” refer to the direction toward the outside of the stator core 10 (B2 direction).
- the rotating electric machine 200 includes a stator 100 and a rotor 150.
- the stator 100 and the rotor 150 are each formed in a circular ring shape.
- the stator 100 and the rotor 150 face each other.
- the rotor 150 is disposed radially inside (B1 direction side) the stator 100.
- the rotor 150 is provided with a plurality of permanent magnets (not shown). That is, the rotating electric machine 200 of this embodiment is configured as an inner rotor type rotating electric machine.
- the stator 100 includes a stator core 10.
- the stator core 10 is disposed so as to face the rotor 150 in the radial direction.
- the stator core 10 includes a plurality of slots 11 (for example, 48 slots). Teeth 12 are provided between adjacent slots 11.
- the stator core 10 includes, for example, a plurality of electromagnetic steel plates laminated in the direction of the central axis of rotation (Z1 direction and Z2 direction), and is configured to allow magnetic flux to pass through.
- the stator core 10 may be formed by compression molding magnetic powder.
- the stator core 10 includes end faces 10a on both sides in the axial direction (Z1 direction) and the other side (Z2 direction).
- the stator 100 includes a stator coil 20.
- FIG. 2 is a circuit diagram of a Y-connected three-phase coil according to this embodiment.
- the stator coil 20 is connected to an external power supply and configured to receive power (e.g., three-phase AC power).
- the stator coil 20 is configured to generate a magnetic field when power is supplied to it.
- the stator coil 20 includes a U-phase coil 30, a V-phase coil 40, and a W-phase coil 50, through which three-phase (U-phase, V-phase, and W-phase) AC currents flow.
- the U-phase coil 30 includes a U1 coil section 31, a U2 coil section 32, a U3 coil section 33, and a U4 coil section 34, which are connected in parallel to each other.
- the V-phase coil 40 includes a V1 coil section 41, a V2 coil section 42, a V3 coil section 43, and a V4 coil section 44, which are connected in parallel to each other.
- the W-phase coil 50 includes a W1 coil section 51, a W2 coil section 52, a W3 coil section 53, and a W4 coil section 54, which are connected in parallel to each other.
- the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are Y-connected (star-connected).
- the AC power for each of the U-phase, V-phase, and W-phase is input from the power line terminal 61 to the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50, respectively.
- the output sides of the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are connected to each other via a neutral terminal 62.
- FIG. 3 is a perspective view of the stator 100 according to this embodiment.
- FIG. 3A is a side view of the stator 100 according to this embodiment.
- FIG. 3B is a top view of the stator 100 according to this embodiment.
- FIG. 3C is a diagram for explaining the configuration of the coil pieces 70 that form the stator coil 20.
- the stator coil 20 is wound around the stator core 10.
- the stator coil 20 is in a wave-wound form, with multiple coil pieces 70 (FIG. 3C) arranged in each of the multiple slots 11.
- the stator coil 20 is formed as a wave-wound conductor by connecting multiple coil pieces 70.
- Each of the multiple coil pieces 70 may have an inverted U-shape when viewed with the Z1 side facing up.
- Each of the multiple coil pieces 70 may be in the form of a rectangular cross-section flat conductor wire covered with an insulating coating.
- Each of the multiple coil pieces 70 includes a slot insertion portion 21 and a transition portion 22.
- the slot insertion portion 21 extends in the axial direction (Z direction) and is accommodated in each of the multiple slots 11.
- the transition portion 22 connects a pair of the multiple slot insertion portions 21 together. In other words, the transition portion 22 connects the slot insertion portions 21 housed in different slots 11 together.
- the transition portion 22 is formed on the Z2 direction side and the Z1 direction side, respectively.
- the shape of the transition portion 22 differs for each of the first transition portion 23, the second transition portion 24, and the third transition portion 25 described below.
- the jumper portions 22 on the Z2 side may be bent outward in the circumferential direction and joined to the jumper portions 22 on the Z2 side of different coil pieces 70 by laser joining or the like.
- the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 have substantially the same configuration. Therefore, the following description will mainly focus on the U-phase coil 30.
- the U-phase coil 30 is arranged in the stator core 10 in such a manner that the four sets of the U1 coil section 31, U2 coil section 32, U3 coil section 33, and U4 coil section 34 form a parallel circuit.
- One end of each of the U1 coil section 31, U2 coil section 32, U3 coil section 33, and U4 coil section 34 is connected to a power line terminal 61. AC power is supplied from the power line terminal 61.
- the other end of each of the U1 coil section 31, U2 coil section 32, U3 coil section 33, and U4 coil section 34 is connected to a neutral line terminal 62.
- FIG. 4 is a diagram showing the configuration of the U1 coil section 31 of the U-phase coil.
- FIG. 5 is a diagram showing the configuration of the U2 coil section 32 of the U-phase coil.
- FIG. 6 is a diagram showing the configuration of the U3 coil section 33 of the U-phase coil.
- FIG. 7 is a diagram showing the configuration of the U4 coil section 34 of the U-phase coil.
- FIG. 8 is a diagram showing the arrangement of each terminal (power line terminal 61 and neutral line terminal 62) related to the U-phase coil 30, and shows only a part of the outermost diameter side of the U-phase coil 30 (one turn portion on the outermost diameter side in the radial direction).
- FIG. 8 is a diagram showing the arrangement of each terminal (power line terminal 61 and neutral line terminal 62) related to the U-phase coil 30, and shows only a part of the outermost diameter side of the U-phase coil 30 (one turn portion on the outermost diameter side in the radial direction).
- FIG. 9A is a diagram for explaining the second crossover section 24 that connects the first turn slot insertion sections 21 on the outermost diameter side in the radial direction.
- FIG. 9B is a diagram for explaining the third crossover section 25 that connects the eighth turn slot insertion sections 21 on the innermost diameter side in the radial direction.
- the U1 coil portion 31, U2 coil portion 32, U3 coil portion 33, and U4 coil portion 34 of the U-phase coil 30 are each arranged in slots 11 #1 (hereinafter, "number” will be written as "#"), #6, #7, #12, #13, #18, #19, #24, #25, #30, #31, #36, #37, #42, #43, and #48 of the 48 slots 11.
- the slots 11 of #1 and #48, the slots 11 of #6 and #7, the slots 11 of #12 and #13, the slots 11 of #18 and #19, the slots 11 of #24 and #25, the slots 11 of #30 and #31, the slots 11 of #36 and #37, and the slots 11 of #42 and #43 are two slots 11 adjacent to each other in the circumferential direction (direction A).
- Figs. 4 to 7 are views showing the annular stator core 10 in an expanded form, with the up-down direction being the radial direction (direction B) of the stator core 10 and the left-right direction being the circumferential direction (direction A) of the stator core 10. That is, in Figs. 4 to 7, the left and right ends of the figures are connected to each other.
- the V-phase coil 40 and the W-phase coil 50 are arranged in the stator core 10 with two and four slots 11 shifted from the U-phase coil 30, respectively.
- the multiple slot insertion parts 21 are housed in each of the multiple slots 11 in a state lined up along the radial direction (B direction) of the stator core 10. Specifically, in this embodiment, eight slot insertion parts 21 are arranged in a row in the radial direction in one slot 11. For example, in one slot 11, the slot insertion part 21 arranged on the outermost side (outer diameter side: B2 direction side) is the first turn (first layer), and the slot insertion part 21 arranged on the innermost side (inner diameter side: B1 side) is the eighth turn (eighth layer). Note that in Figures 4 to 7, the slot insertion parts 21 are arranged so that current (current from the power supply to the U-phase coil 30) flows in the order of the white numbers on a black background at positions indicated by white numbers.
- the crossover portion 22 has a first crossover portion 23, a second crossover portion 24, and a third crossover portion 25.
- the crossover portion 22 (first crossover portion 23, second crossover portion 24, and third crossover portion 25) shown by solid lines is disposed on the Z1 direction side of the stator core 10
- the crossover portion 22 (first crossover portion 23) shown by dashed lines is disposed on the Z2 direction side of the stator core 10.
- the crossover portion 22 (first crossover portion 23, second crossover portion 24, and third crossover portion 25) are illustrated typically as straight lines when viewed from the Z direction, but the crossover portion 22 (first crossover portion 23, second crossover portion 24, and third crossover portion 25) may have a curved shape when viewed from the Z direction.
- the first crossover portion 23 connects pairs of slot insertion portions 21 that are located at different radial (B) positions among the multiple slot insertion portions 21 housed in different slots 11. Specifically, the first crossover portion 23 connects the slot insertion portions 21 such that the radial positions (number of turns) of the connected slot insertion portions 21 are changed stepwise in sequence toward one radial side. In other words, the first crossover portion 23 connects pairs of slot insertion portions 21 such that the number of turns increases toward one circumferential side (A1 direction side).
- the first crossover portion 23 and the slot insertion portions 21 form four wave winding portions 20a, 20b, 20c, and 20d, each of which is wave wound around the stator core 10.
- the multiple first crossover sections 23 and the slot insertion section 21 are connected to sequentially connect the slot insertion section 21 arranged on the outermost diameter side (first turn) to the slot insertion section 21 arranged on the innermost diameter side (eighth turn).
- the multiple first crossover sections 23 connect the slot insertion sections 21 in pairs so that the radial position of the connected slot insertion section 21 is changed in stages in sequence from the slot insertion section 21 arranged at the first turn position, which is the end on the other radial side (e.g., the B2 direction side) of the slot 11 to the slot insertion section 21 arranged at the eighth turn position, which is the end on one side (e.g., the B1 direction side).
- the first crossover sections 23 connect the slot insertion sections 21 arranged in pairs, which are arranged in different slots 11 and are shifted from each other radially (in the B direction) to the outside or inside. That is, in each of the wave winding sections 20a to 20d, the first crossover section 23 connects the slot insertion sections 21 while being shifted by one turn in sequence from the 8th turn to the 1st turn.
- the wave winding portions 20a to 20d are arranged to make at least one round trip (two round trips in this embodiment).
- One wave winding portion 20a is wave-wound along one side of the circumferential direction of the stator core 10 (e.g., the A1 direction) by the slot insertion portion 21 and the first crossover portion 23.
- the wave winding portion 20b connected to the wave winding portion 20a is wave-wound along the other side of the circumferential direction toward the other side of the circumferential direction (e.g., the A2 direction) opposite the wave winding portion 20a.
- the wave winding portion 20c and the wave winding portion 20d are similarly wave-wound toward one side and the other side of the circumferential direction, respectively.
- the wave winding portion 20a, the wave winding portion 20b, the wave winding portion 20c, and the wave winding portion 20d are connected in this order to form the U1 coil portion 31, the U2 coil portion 32, the U3 coil portion 33, and the U4 coil portion 34 of the U-phase coil 30 in the stator coil 20. That is, each of the U1 coil section 31, U2 coil section 32, U3 coil section 33, and U4 coil section 34 is arranged on the stator core 10 while folding back three times in the circumferential direction.
- the wave winding sections 20a to 20d are connected to each other by either the second crossover section 24 or the third crossover section 25.
- the second crossover section 24 and the third crossover section 25 each connect a pair of slot insertion sections 21 that are housed in different slots 11 and have the same radial position (number of turns).
- the second crossover section 24 connects the slot insertion sections 21 that are located on the outermost side in the radial direction (first turn) in each of the multiple slots 11.
- the third crossover section 25 connects the slot insertion sections 21 that are located on the innermost side in the radial direction (eighth turn) in each of the multiple slots 11.
- the second crossover section 24 or the third crossover section 25 connects the slot insertion sections 21 in pairs to each other, so that one and the other of one round trip of the wave winding sections 20a to 20d formed by the first crossover section 23 and the slot insertion section 21 are connected so as to fold back.
- the U1 coil section 31 four wave winding sections 20a to 20d, one second crossover section 24, and two third crossover sections 25 form one conductor that is wave wound by folding back multiple times.
- the power line terminal 61 is connected to the slot insertion portion 21 (part marked with white numeral number 1) located on the outermost diameter side (first turn) of the slot 11 of #37.
- the power line terminal 61 may be in the form of an end of the coil piece 70, or may be in the form of a separate member joined to the end of the coil piece 70.
- the first crossover portion 23 extends from #37 to #31 as the crossover portion 22 on the Z2 direction side.
- the first crossover portion 23 is connected to the slot insertion portion 21 (part marked with numeral 2) located in the second turn of the slot 11 of #31, shifted inward from the outermost diameter side. Thereafter, the first crossover portion 23 is alternately connected to the slot insertion portion 21 on the Z1 direction side and the Z2 direction side in the order of the third turn of slot 11 of #25, the fourth turn of slot 11 of #19, and the fifth turn of slot 11 of #13, and is connected up to the eighth turn of slot insertion portion 21 (part number 8) of slot 11 of #43 while increasing the number of turns inward by one. In this way, a wave winding portion 20a connected by eight slot insertion portions 21 and seven first crossover portions 23 is formed.
- the third crossover portion 25 is provided so as to fold back from the 8th turn slot insertion portion 21 of the slot 11 of #43 (part of the white number 8) to the 8th turn slot insertion portion 21 of the slot 11 of #48 (part of the number 9) on the Z1 side of the stator core 10.
- the wave winding portion 20b is formed in the same manner as the wave winding portion 20a from the slot 11 of #48 where the part of the number 9 is provided, to the slot 11 of #42, changing its direction to the circumferential A2 direction side.
- the U1 coil portion 31 is folded back from the wave winding portion 20b to the wave winding portion 20c by the second crossover portion 24 provided on the Z1 side of the stator core 10 from the slot insertion portion 21 of the first turn of the slot 11 of #42 (part of the number 16) to the slot insertion portion 21 of the first turn of the slot 11 of #1 (part of the number 17). Thereafter, the U1 coil section 31 is folded back in the same manner from the wave winding section 20c to the wave winding section 20d by the third crossover section 25. In this way, one U1 coil section 31 is formed by the four wave winding sections 20a to 20d folded back three times.
- the wave winding section 20d is connected to the neutral conductor terminal 62 from the slot insertion section 21 (part numbered 32) of the first turn of the #6 slot 11.
- the neutral conductor terminal 62 may be in the form of the end of the coil piece 70, or may be in the form of a separate member joined to the end of the coil piece 70.
- the first crossover section 23 connects the second turn to the third turn, the fourth turn to the fifth turn, and the sixth turn to the seventh turn, and is positioned on the Z1 direction side.
- the second crossover section 24, which connects the first turns together, and the third crossover section 25, which connects the eighth turns together, are all positioned on the Z1 direction side.
- the power line terminal 61 and the neutral line terminal 62 are also connected on the Z1 direction side.
- the slot insertion portion 21 (the slot insertion portion 21 inserted into slot 11 #37 in the U1 coil portion 31) that is directly connected to the power line terminal 61 among the multiple slot insertion portions 21 is also referred to as the "first slot insertion portion 21A" when distinguishing it from the other slot insertion portions 21.
- the slot insertion portion 21 (the slot insertion portion 21 inserted into slot 11 #6) that is directly connected to the neutral terminal 62 among the multiple slot insertion portions 21 is also referred to as the "second slot insertion portion 21B" when distinguishing it from the other slot insertion portions 21.
- the slot insertion portion 21 (the slot insertion portion 21 inserted into slot 11 #7, #12, #43, #48) that is inserted into the innermost side of the slot 11 (the 8th turn) among the multiple slot insertion portions 21 is also referred to as the "third slot insertion portion 21C" when distinguishing it from the other slot insertion portions 21.
- each slot insertion portion 21 along the current flow direction from the first slot insertion portion 21A to the second slot insertion portion 21B is inserted into the corresponding slot 11 in a manner that has at least one reversal (three times in this example) in the change trend (increase and decrease) of the slot number.
- the "slot number" here means that it increases relatively in sequence in a clockwise or counterclockwise direction along the circumferential direction as viewed in the axial direction with respect to the stator core 10.
- the direction in which the number increases by one from #1 to #48 corresponds to the direction in which the slot number increases, and the direction in which the number changes from #48 to #1 also corresponds to the direction in which the slot number increases. Also, the direction in which the number decreases by one from #48 to #1 corresponds to the direction in which the slot number decreases, and the direction in which the number changes from #1 to #48 also corresponds to the direction in which the slot number decreases.
- the slot insertion section 21 along the current flow direction from the first slot insertion section 21A to the second slot insertion section 21B reverses the increase and decrease of the slot number starting from the third slot insertion section 21C.
- the slot number decreases from the first slot insertion section 21A to the first third slot insertion section 21C (the third slot insertion section 21C inserted into slot 11 #43) in the current flow direction, and the slot number increases from the last third slot insertion section 21C (the third slot insertion section 21C inserted into slot 11 #12) to the second slot insertion section 21B in the current flow direction.
- each slot insertion section 21 along the current flow direction from the first slot insertion section 21A to the second slot insertion section 21B regularly changes its radial position.
- the radial position in the slot 11 shifts radially inward by one turn (see the first crossover section 23).
- the radial position in the slot 11 shifts radially outward by one turn (see the first crossover section 23) or the same radial position is maintained (see the second crossover section 24 and the third crossover section 25).
- the U2 coil section 32, U3 coil section 33, and U4 coil section 34 are each configured as part of the stator coil 20 that is wave-wound by folding back the four wave winding sections 20a to 20d multiple times.
- the power line terminal 61 and neutral line terminal 62 of each of the U2 coil section 32, U3 coil section 33, and U4 coil section 34 are arranged radially outward, similar to the U1 coil section 31. That is, as shown in FIG. 8, the power line terminals 61 and neutral line terminals 62 of each phase are all arranged radially outward of the stator core 10.
- the symbols U, V, and W represent each phase, and the numbers 1 to 4 following the symbols U, V, and W represent a corresponding one of the four sets.
- U1 to U4 represent the U1 coil section 31, U2 coil section 32, U3 coil section 33, and U4 coil section 34, respectively.
- the final "_in” and “_out” represent the power line terminal 61 and neutral line terminal 62, respectively.
- the power line terminals 61 for the U1 coil section 31 and the U2 coil section 32 and the power line terminals 61 for the U3 coil section 33 and the U4 coil section 34 are set at diagonal positions in the circumferential direction as shown in FIG. 3B. This is also the case for the V-phase coil 40 and the W-phase coil 50.
- the first crossover portion 23 forming one of the wave winding portions 20a to 20d and the first crossover portion 23 forming the other of the wave winding portions 20a to 20d connect the slot insertion portions 21 in pairs so that the radial positions of the connected slot insertion portions 21 change stepwise (sloping) in parallel with each other.
- the number (pitch) of slots 11 spanned by the first crossover portion 23 is common in each of the multiple wave winding portions 20a to 20d.
- the first crossover portion 23 connects the slot insertion portions 21 across five slots 11 while connecting the slot insertion portions 21 with one turn shifted.
- the pitch number of the first crossover portion 23 is all "6" in each of the multiple wave winding portions 20a to 20d.
- the first crossover portion 23 has a common pitch on one side (Z1 direction side) and the other side (Z2 direction side) of the stator core 10.
- parallel here means that the radial positions of the slot insertion parts 21 connected to the first crossover parts 23 are parallel when arranged along the circumferential direction. In other words, it means that the positions of the slot insertion parts 21 are parallel when the annular stator core 10 is shown in an expanded form as in Figures 4 to 7.
- the second and third crossover sections 24 and 25 each have two types of pitch numbers: one with a pitch of 5 and the other with a pitch of 7.
- the second crossover section 24 with a pitch number of 7 is provided between slots #42 and #1 of 11
- the third crossover section 25 with a pitch number of 5 is provided between slots #43 and #48 and between #7 and #12.
- the second crossover section 24 with a pitch number of 5 is provided between slots #43 and #48 of 11
- the third crossover section 25 with a pitch number of 7 is provided between slots #42 and #1 and between #6 and #13.
- the second crossover sections 24 or the third crossover sections 25 connected to the slot insertion sections 21 arranged in a common slot 11 and having different pitch numbers are arranged so as to overlap each other when viewed from the axial direction (Z direction).
- the second crossover section 24 or the third crossover section 25 having a larger pitch number is arranged above (Z1 direction side) the second crossover section 24 or the third crossover section 25 having a smaller pitch number.
- the second crossover section 24 and the third crossover section 25 having a pitch number of 7 are arranged so as to cover the second crossover section 24 and the third crossover section 25 having a pitch number of 5 on the upper side, respectively.
- the slot insertion portion 21 forming one of the multiple wave winding portions 20a to 20d for one round trip and the slot insertion portion 21 forming the other of the multiple wave winding portions 20a to 20d for one round trip are each disposed in adjacent slots 11.
- the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are each disposed alternately in a pair of adjacent slots 11 along the radial direction.
- the slot insertion portions 21 forming the wave winding portions 20a-20d are accommodated in two slots 11 that are adjacent to each other in the circumferential direction, namely #1 and #48, #6 and #7, #12 and #13, #18 and #19, #24 and #25, #30 and #31, #36 and #37, and #42 and #43.
- the slot insertion portions 21 are alternately arranged in different slots 11.
- the U-phase U2 coil portion 32, U3 coil portion 33, and U4 coil portion 34 of FIG. 5 to FIG. 7 are also similar to the U-phase U1 coil portion 31. This makes it possible to prevent deviations in the positional relationship between the U-phase U1 coil section 31, U2 coil section 32, U3 coil section 33, and U4 coil section 34 and the permanent magnet (not shown) of the rotor 150.
- the stator coil 20 is formed using seven types of coil pieces 70. That is, three types of coil pieces 70 that constitute a pair of slot insertion parts 21 and a first crossover part 23, two types of coil pieces 70 that constitute a pair of slot insertion parts 21 and a second crossover part 24, and two types of coil pieces 70 that constitute a pair of slot insertion parts 21 and a third crossover part 25 are used.
- the three types of coil pieces 70 that constitute a pair of slot insertion parts 21 and a first crossover part 23 are three types on the Z1 direction side, namely, a coil piece 70 that connects the second turn to the third turn, a coil piece 70 that connects the fourth turn to the fifth turn, and a coil piece 70 that connects the sixth turn to the seventh turn.
- the two types of coil pieces 70 that constitute a pair of slot insertion parts 21 and a second crossover part 24 and the two types of coil pieces 70 that constitute a pair of slot insertion parts 21 and a third crossover part 25 are two types with pitch numbers of 5 and 7.
- FIG. 10 is a perspective view of a stator 100' according to a comparative example.
- the stator 100' according to the comparative example differs in that some of the power line terminals 61' and neutral line terminals 62' are arranged radially inward of the stator core 10.
- the power line terminals 61 and neutral terminals 62 of each phase are all arranged radially outside the stator core 10.
- this configuration it is possible to avoid the inconvenience that occurs when at least one power line terminal 61 is arranged radially inside.
- the power line terminal 61 can be arranged axially inward from the axially outermost position of the transition portion 22 (i.e., the axially outermost position of the coil end, see line L3) when viewed in the radial direction. This prevents an increase in the axial size of the stator 100 caused by the power line terminal 61, and as a result, it is possible to reduce the axial size of the stator 100.
- the wiring connected to the power line terminal 61 and connected to the inverter (e.g., wiring in the form of a cable) can also be arranged axially inward from the axially outermost position of the transition portion 22 when viewed in the radial direction.
- the neutral terminal 62 and the neutral bus bar 63 connecting it can be positioned axially inward from the outermost axial position of the transition section 22 (i.e., the outermost axial position of the coil end, see line L3) when viewed in the radial direction.
- This makes it possible to prevent an increase in the axial size of the stator 100 caused by the neutral terminal 62 and the neutral bus bar 63 connecting it, and as a result, it becomes possible to reduce the axial size of the stator 100.
- the first crossover portion 23 forms wave winding portions 20a to 20d that are wave wound on the stator core 10 together with the slot insertion portions 21 by connecting pairs of the slot insertion portions 21 together so that the radial positions of the connected slot insertion portions 21 are changed stepwise in sequence toward one radial side.
- the slot insertion portions 21 can be connected to each other without providing a portion where the radial positions of the connected slot insertion portions 21 are switched midway. Therefore, it is possible to prevent an increase in the number of types of coil pieces 70 on one axial side of the stator core 10.
- the second crossover portion 24 and the third crossover portion 25 connect the slot insertion portions 21 in pairs, thereby connecting one of the wave winding portions 20a to 20d of one round trip formed by the first crossover portion 23 and the slot insertion portion 21 in a folded-back manner to the other.
- This allows the wave winding portions 20a to 20d to be connected in a folded-back manner by the second crossover portion 24 and the third crossover portion 25, which connect the slot insertion portions 21 that are at the same radial position within the slot 11, to prevent the shape of the folded-back portion from becoming complicated.
- the radial positions of the connected slot insertion portions 21 in one and the other of the wave winding portions 20a to 20d for one round trip are arranged so as to change in stages parallel to each other, so that the shapes of the conductors (coil pieces 70) constituting each of the wave winding portions 20a to 20d for one round trip can be made common. Therefore, even when the wave winding portions 20a to 20d for one round trip are connected in a folded-back manner, the number of types of coil pieces 70 used to form the stator coil 20 can be reduced.
- the wave winding sections 20a to 20d can be formed so that the slot insertion sections 21 are arranged in each of the multiple slots 11 so that they are connected in stages from one end of the radial direction to the other end, and the ends of the wave winding sections 20a to 20d can be arranged on the outermost side in the radial direction. Therefore, when connecting the power line terminals 61 or neutral line terminals 62 to the stator coil 20, the manufacturing process can be prevented from becoming complicated compared to when connecting to a conductor (coil piece 70) midway through the slot 11.
- the stator coil 20 is formed by folding back multiple times and wave-wound using multiple wave winding sections 20a-20d, the second crossover section 24 (outermost coil end section), and the third crossover section 25 (innermost coil end section), so the stator coil 20 can be formed so that it is wave-wound while folding back multiple times at each of the innermost and outermost radial ends of the slot 11. Therefore, even if the number of slot insertion sections 21 housed in one slot 11 is large, the stator coil 20 can be formed by folding back multiple times at each of the innermost and outermost radial ends of the slot 11, so that the number of types of coil pieces 70 that make up the stator coil 20 can be suppressed.
- the stator coil 20 can be formed by connecting pairs of slot insertion parts 21 that are arranged radially outward or inward, one at a time, so that the slot insertion parts 21 can be densely arranged in each of the multiple slots 11. Therefore, the slot insertion parts 21 can be efficiently connected to the multiple slot insertion parts 21 arranged in the slots 11, while being connected in pairs so that the radial positions of the connected slot insertion parts 21 are changed stepwise in sequence toward one radial side.
- the slot insertion portion 21 is arranged in a common slot 11 for both one and the other of the wave winding portions 20a to 20d for one round trip, the positional relationship of the stator coil 20 with respect to the magnet arranged in the rotor 150 facing the stator 100 will be biased, causing bias in the current flowing through the wave winding portions 20a to 20d.
- the slot insertion portion 21 forming one of the wave winding portions 20a to 20d for one round trip and the slot insertion portion 21 forming the other of the wave winding portions 20a to 20d for one round trip are arranged in adjacent slots 11, thereby preventing bias in the current flowing through the wave winding portions 20a to 20d.
- the neutral terminals 62 are also all arranged radially outward, but some or all of the neutral terminals 62 may be arranged radially inward of the stator core 10.
- some or all of the second slot insertion portion 21B may be arranged on the radially innermost side within the slot 11.
- the first crossover portion 23 forming one of the wave winding portions 20a to 20d and the first crossover portion 23 forming the other one of the wave winding portions 20a to 20d have their radial positions of the connecting slot insertion portions 21 changed in stages in parallel to each other, but this is not limited to this.
- the radial positions of the slot insertion portions 21 of one of the wave winding portions and the other one of the wave winding portions do not have to be parallel to each other.
- the wave winding portions 20a to 20d are folded back at the outermost and innermost radial positions, but this is not limited to the above. For example, they may be folded back midway in the radial direction.
- the stator coil 20 is folded three times using four wave winding sections 20a to 20d, but this is not limited to the above.
- the stator coil 20 may be configured to be folded only once using two wave winding sections.
- the first crossover portion 23 connects pairs of slot insertion portions 21 that are arranged in different slots 11 and that are offset from each other by one outward or inward in the radial direction, but this is not limited to the above.
- the first crossover portion 23 may connect slot insertion portions that are offset by two or more slot insertion portions. In other words, it may connect slot insertion portions that are offset from each other by two or more turns.
- the slot insertion portion 21 forming one of the wave winding portions 20a to 20d and the slot insertion portion 21 forming the other of the wave winding portions 20a to 20d are arranged in adjacent slots 11, but this is not limited to the above.
- the slot insertion portion forming one of the wave winding portions for one round trip and the slot insertion portion forming the other of the wave winding portions for one round trip may be arranged in a common slot.
- the slot insertion portion forming one of the wave winding portions for one round trip and the slot insertion portion forming the other of the wave winding portions for one round trip may be arranged in slots spaced apart from each other.
- the stator coil 20 is formed by the inverted U-shaped coil pieces 70, but this is not limited to the above.
- the coil end parts may be formed by joining coil pieces separate from the rod-shaped coil pieces.
- the coil part may be formed by combining inverted U-shaped coil pieces and U-shaped coil pieces from one side and the other side in the axial direction of the stator core 10.
- the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 each constitute a coil with four coils in parallel, but this is not limited to the above.
- each of the U-phase coil, the V-phase coil, and the W-phase coil may be configured with more than six coils in parallel, such as six or eight coils in parallel.
- each slot 11 houses eight slot insertion portions 21 lined up in the radial direction, but this is not limited to this.
- the number of slots in the stator core may be other than 48.
- the number of slot insertion portions housed in one slot may be other than eight.
- stator stator for rotating electric machine
- 20 stator coil
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Windings For Motors And Generators (AREA)
Abstract
Description
複数のスロットを有し、前記ステータコイルが巻装されるステータコアとを備え、
前記ステータコイルは、
前記複数のスロットのうちの、対応する各スロットに挿入されるスロット挿入部と、
前記ステータコアの軸方向端面から露出し、対の前記スロット挿入部の間を接続する態様で周方向に延在する渡り部とを有し、
各相において、前記4組以上の各組における複数の前記スロット挿入部のうちの、前記動力線端子に直接的に接続される第1スロット挿入部は、前記ステータコアの軸方向一方側において、対応するスロットの最外径側に位置する、回転電機用ステータが提供される。
Claims (7)
- 各相に係るコイル部が4組以上の並列回路で中性線端子と各相の動力線端子との間に接続されるステータコイルと、
複数のスロットを有し、前記ステータコイルが巻装されるステータコアとを備え、
前記ステータコイルは、
前記複数のスロットのうちの、対応する各スロットに挿入されるスロット挿入部と、
前記ステータコアの軸方向端面から露出し、対の前記スロット挿入部の間を接続する態様で周方向に延在する渡り部とを有し、
各相において、前記4組以上の各組における複数の前記スロット挿入部のうちの、前記動力線端子に直接的に接続される第1スロット挿入部は、前記ステータコアの軸方向一方側において、対応するスロットの最外径側に位置する、回転電機用ステータ。 - 各相において、前記各組における複数の前記スロット挿入部のうちの、前記中性線端子に直接的に接続される第2スロット挿入部は、前記ステータコアの前記軸方向一方側において、対応するスロットの最外径側に位置する、請求項1に記載の回転電機用ステータ。
- 前記複数のスロットについて、前記ステータコアに対して軸方向視の周方向に沿って時計回り又は反時計回りで順に相対的に増加するスロット番号を付与した場合に、前記ステータコイルにおける一の相に係る各組において、前記第1スロット挿入部から前記第2スロット挿入部までの電流の流れ方向に沿った各スロット挿入部は、スロット番号が増加方向及び減少方向のうちのいずれか一方の第1方向から他方の第2方向へと変化する反転が少なくとも1回生じる態様で、対応するスロットに挿入される、請求項2に記載の回転電機用ステータ。
- 各相において、前記各組における複数の前記スロット挿入部は、前記第1スロット挿入部及び前記第2スロット挿入部に加えて、対応するスロットの最内径側に位置する少なくとも1つの第3スロット挿入部を含み、
前記各組において、前記第1スロット挿入部から前記第2スロット挿入部までの前記流れ方向に沿った各スロット挿入部は、前記第1スロット挿入部から前記流れ方向で最初の前記第3スロット挿入部までスロット番号が前記第1方向に変化する態様、かつ、前記流れ方向で最後の前記第3スロット挿入部から前記第2スロット挿入部までスロット番号が前記第2方向に変化する態様で、対応するスロットに挿入される、請求項3に記載の回転電機用ステータ。 - 前記各組において、前記第1スロット挿入部から前記第2スロット挿入部までの前記流れ方向に沿った各スロット挿入部は、スロット番号が前記第1方向に変化する際はスロット内の径方向位置が径方向内側に1ターン分だけずれる態様、かつ、スロット番号が前記第2方向に変化する際はスロット内の径方向位置が径方向外側に1ターン分だけずれる又は同じ径方向位置が維持される態様で、対応するスロットに挿入される、請求項3に記載の回転電機用ステータ。
- 前記ステータコイルにおける複数の前記中性線端子の間を接続する中性点バスバーを更に備え、
前記中性点バスバーは、径方向に視て、前記渡り部の軸方向最も外側の位置よりも軸方向内側に位置する、請求項1に記載の回転電機用ステータ。 - 前記動力線端子は、径方向に視て、前記渡り部の軸方向最も外側の位置よりも軸方向内側に位置する、請求項1から6のうちのいずれか1項に記載の回転電機用ステータ。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP23879581.9A EP4576507A4 (en) | 2022-10-19 | 2023-10-02 | ROTARY ELECTRIC MACHINE STATOR |
| CN202380066908.XA CN119923784A (zh) | 2022-10-19 | 2023-10-02 | 旋转电机用定子 |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2022167302A JP7806652B2 (ja) | 2022-10-19 | 2022-10-19 | 回転電機用ステータ |
| JP2022-167302 | 2022-10-19 |
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| Publication Number | Publication Date |
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| WO2024084934A1 true WO2024084934A1 (ja) | 2024-04-25 |
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| PCT/JP2023/035862 Ceased WO2024084934A1 (ja) | 2022-10-19 | 2023-10-02 | 回転電機用ステータ |
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| WO (1) | WO2024084934A1 (ja) |
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|---|---|---|---|---|
| WO2025248682A1 (ja) * | 2024-05-29 | 2025-12-04 | Astemo株式会社 | 回転電機の固定子、回転電機 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017034848A (ja) * | 2015-07-31 | 2017-02-09 | 株式会社デンソー | 回転電機の固定子及びその固定子を備えた回転電機 |
| WO2019062914A1 (zh) * | 2017-09-29 | 2019-04-04 | 比亚迪股份有限公司 | 定子组件和具有其的电机和车辆 |
| JP2019201485A (ja) | 2018-05-16 | 2019-11-21 | アイシン精機株式会社 | 回転電機 |
| JP2022136858A (ja) * | 2021-03-08 | 2022-09-21 | 日本電産株式会社 | モータ |
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| CN109586458B (zh) * | 2017-09-29 | 2021-04-20 | 比亚迪股份有限公司 | 定子组件和具有其的电机和车辆 |
| CN111478465B (zh) * | 2020-05-26 | 2025-06-03 | 上海威迈斯新能源有限公司 | 扁线定子组件及电机 |
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2022
- 2022-10-19 JP JP2022167302A patent/JP7806652B2/ja active Active
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2023
- 2023-10-02 EP EP23879581.9A patent/EP4576507A4/en active Pending
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017034848A (ja) * | 2015-07-31 | 2017-02-09 | 株式会社デンソー | 回転電機の固定子及びその固定子を備えた回転電機 |
| WO2019062914A1 (zh) * | 2017-09-29 | 2019-04-04 | 比亚迪股份有限公司 | 定子组件和具有其的电机和车辆 |
| JP2019201485A (ja) | 2018-05-16 | 2019-11-21 | アイシン精機株式会社 | 回転電機 |
| JP2022136858A (ja) * | 2021-03-08 | 2022-09-21 | 日本電産株式会社 | モータ |
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| Title |
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Cited By (1)
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|---|---|---|---|---|
| WO2025248682A1 (ja) * | 2024-05-29 | 2025-12-04 | Astemo株式会社 | 回転電機の固定子、回転電機 |
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| EP4576507A4 (en) | 2025-12-10 |
| JP2024060143A (ja) | 2024-05-02 |
| CN119923784A (zh) | 2025-05-02 |
| EP4576507A1 (en) | 2025-06-25 |
| JP7806652B2 (ja) | 2026-01-27 |
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