WO2023204150A1 - 回転電機用ステータ - Google Patents
回転電機用ステータ Download PDFInfo
- Publication number
- WO2023204150A1 WO2023204150A1 PCT/JP2023/015152 JP2023015152W WO2023204150A1 WO 2023204150 A1 WO2023204150 A1 WO 2023204150A1 JP 2023015152 W JP2023015152 W JP 2023015152W WO 2023204150 A1 WO2023204150 A1 WO 2023204150A1
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- WIPO (PCT)
- Prior art keywords
- coil
- slot
- phase
- slots
- center
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
-
- 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
-
- 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
Definitions
- the present disclosure relates to a stator for a rotating electrical machine.
- stator coil is wound in short segment winding using a plurality of layers (layers in the radial direction within the slot) for each phase.
- the present disclosure aims to reduce circulating current in a configuration in which the stator coil is connected in parallel in two sets for each phase and wound with short-pitch winding.
- a stator core having a plurality of slots;
- a stator coil formed by assembling a plurality of coil pieces for each phase to the stator core over the entire circumference,
- the stator coil has two sets connected in parallel for each phase, and is wound with short-pitch winding,
- the circumferential coil center of the first set of coils and the circumferential coil center of the second set of coils are, respectively,
- a coil center position for each phase which corresponds to each coil center position formed at each magnetic pole pitch over the entire circumference of the stator core, or
- a stator for a rotating electric machine is provided, which is alternately shifted by the same amount along the circumferential direction on one side and the other side with respect to the coil center position for each magnetic pole pitch.
- stator coil is wired in two sets in parallel for each phase and wound with short-pitch winding.
- FIG. 1 is a diagram schematically showing a stator for a rotating electric machine according to an embodiment.
- FIG. 3 is a diagram showing an example of a wiring configuration of a stator coil related to a stator for a rotating electric machine according to a first embodiment.
- FIG. 3 is an overall winding diagram of a stator coil according to Example 1.
- FIG. It is an explanatory view of a coil piece.
- 4 is a winding diagram (a part of FIG. 3) of a general part according to Example 1, and is an explanatory diagram of a repeating pattern.
- FIG. FIG. 3 is a side view (a side view viewed in the radial direction from the radial inside) showing a method of arranging the coil pieces forming the general portion according to the first embodiment.
- FIG. 3 is a diagram showing the positional relationship between coil pieces in the coil end portion according to Example 1, and is a schematic diagram of a part of the stator coil viewed from the inner diameter side.
- FIG. 6 is an explanatory diagram of a stator coil according to a comparative example.
- FIG. 3 is an explanatory diagram of circulating current.
- FIG. 7 is an explanatory diagram of a current waveform based on an analysis result of a comparative example.
- FIG. 7 is an explanatory diagram of a torque waveform based on an analysis result of a comparative example.
- FIG. 3 is an explanatory diagram of a current waveform based on analysis results according to Example 1.
- FIG. FIG. 3 is an explanatory diagram of a torque waveform based on analysis results according to Example 1.
- FIG. 3 is a winding diagram of a portion of a stator coil according to a second embodiment.
- FIG. 7 is a side view (a side view viewed in the radial direction from the inside in the radial direction) showing a method of arranging the coil pieces forming the general part of the stator coil according to the second embodiment.
- FIG. 1 is a diagram schematically showing a stator 10 for a rotating electrical machine according to this embodiment.
- the stator 10 for a rotating electrical machine includes a stator core 112 and a stator coil 114.
- the stator core 112 has a cylindrical shape with a central axis I, and may be formed of, for example, laminated steel plates.
- the configuration of stator coil 114 will be explained in detail below.
- FIG. 2 is a diagram illustrating an example of the connection mode of the stator coil 114 related to the stator 10 for a rotating electric machine of this embodiment.
- the stator coils 114 are electrically connected at the neutral point of the Y-connection in two sets in parallel for each phase.
- the stator coil 114 includes a U-phase first coil (hereinafter also referred to as “U1-phase coil 221 (U1)”) and a U-phase second coil (hereinafter referred to as “U2-phase coil 221 (U2)”). ) are electrically connected in parallel between the neutral point and the U-phase terminal 90U on the power line side.
- U1-phase coil 221 (U1) U-phase first coil
- U2-phase coil 221 (U2) U-phase second coil
- the stator coil 114 has two sets (pairs) of the first coil 221V1 of the V phase and the second coil 221V2 of the V phase in a parallel relationship, and the neutral point and the power line. It is electrically connected to the side V-phase terminal 90V.
- the stator coil 114 includes two sets (pairs) of a W-phase first coil 221W1 and a W-phase second coil 221W2, which are connected in parallel to the neutral point and the W-phase terminal 90W on the power line side. electrically connected between them.
- the U-phase terminal 90U, V-phase terminal 90V, and W-phase terminal 90W are electrically connected to an inverter and a power source (not shown) via a terminal block 59 (see FIG. 1).
- the U1 phase coil 221 (U1) includes eight series-connected coils U1-1 to U1-8, and the same applies to the U2-phase coil 221 (U2), which includes eight series-connected coils U2-1 to U2-. Contains 8. This also applies to the other phases (V phase and W phase).
- FIG. 3 is an overall winding diagram of the stator coil 114 of this embodiment, and is a schematic diagram of the stator coil 114 expanded in the circumferential direction as seen in the axial direction, as well as the U1 phase coil 221 (U1) and the U2 phase coil 221. (U2) are shown separately. Further, in FIG. 3, only a portion of 48 slots is divided into two stages for convenience of viewing. In FIG. 3, the number placed above each slot 23 represents the slot number, and the numbers 1 to 6 placed on the left side of the stator core 112 represent the number of turns. Further, in FIG. 3, the transition portion of the stator coil 114 (see transition portion 54 in FIG. 4) is shown on the lead side by a dashed line, and on the half-lead side is shown by a solid line. This rule is also common to similar figures below (such as FIG. 8, which will be described later).
- FIG. 4 is an explanatory diagram of the coil piece 52.
- FIG. 5 is a winding diagram (a part of FIG. 3) of a general part that does not involve a neutral point, etc., and is an explanatory diagram of a repeating pattern.
- FIG. 6 is a side view (a side view viewed in the radial direction from the inside in the radial direction) showing a method of arranging the coil pieces forming the general part of the stator coil 114.
- the current flowing through the stator coil 114 at a certain point in time is schematically shown by an arrow R5.
- FIG. 6 schematically shows the number of coil pieces and symbols (diagonal lines) indicating the number, as well as welded portions 60 between the coil pieces.
- FIG. 7 is a diagram showing the positional relationship (positional relationship in the axial direction) between the coil pieces at the coil end portion, and shows part of the stator coil 114 (part in the circumferential direction and part in the axial direction) from the inner diameter side.
- FIG. 7 the star mark and numbers indicate slot pitches.
- a coil piece is a coil piece that forms the stator coil 114, and may be a coil piece in a form called a segment coil, for example.
- the coil piece may be a U-shaped coil piece 52 as shown in FIG. 4, for example.
- the slot pitch for N slots (N is a positive integer) is also referred to as N slot pitch.
- a slot pitch for six slots is also referred to as a 6-slot pitch.
- N-1 slots 23 are positioned between two slots 23 forming a slot pitch of N in the circumferential direction.
- one coil piece 52 is formed into a substantially U-shape having a pair of linear slot accommodating parts 50 and a transition part 54 connecting the pair of slot accommodating parts 50. It's fine.
- the transition portion 54 on the other side in the axial direction may be formed by forming in the circumferential direction from the state shown in FIG.
- a coupling portion 40 that is coupled to a coupling portion 40 of the transition portion 54 of another coil piece 52 is set.
- the coupling portion 40 is a portion where an insulating film (not shown) is removed (that is, a portion where a conductor portion related to a linear conductor is exposed).
- the pair of slot accommodating portions 50 are each inserted (wound) into the slot 23 between the teeth 22 in the circumferential direction (see FIG. 3).
- the coil pieces 52 can be assembled, for example, in the axial direction.
- the slot accommodating portions 50 of the coil pieces 52 shown in FIG. 3 are inserted in a number corresponding to the number of turns (in this embodiment, six as an example) in a line in the radial direction. Therefore, at both ends of the stator core 112 in the axial direction, a plurality of transition portions 54 extending in the circumferential direction are arranged in the radial direction. Note that the transition portion 54 (and the coupling portion 40 that is a part thereof) forms a coil end portion that is a portion that projects axially outward from the axial end surface of the stator core 112.
- transition portion 54 on the lower side of the coil piece 52 may have an offset portion 521B that is offset in the direction of being separated from each other by one layer in the radial direction.
- the upper transition section 54 may also have a similar offset section (not shown).
- both the U1 phase coil 221 (U1) and the U2 phase coil 221 (U2) are formed from a plurality of coil pieces.
- the plurality of coil pieces have a plurality of types, and the types differ depending on the circumferential interval (slot pitch) of the pair of inserted slots 23.
- the plurality of types of coil pieces do not necessarily all have a U-shaped form, and may include an I-shaped coil piece (that is, a coil piece having only one slot accommodating part 50), may be in an I-shape.
- the coil piece 52 inserted into one slot 23 means the coil piece 52 having the slot accommodating part 50 inserted into the one slot 23 concerned. Therefore, the U-shaped coil piece 52 having two slot accommodating parts 50 can also be regarded as a combination of a coil piece inserted into one slot 23 and a coil piece inserted into the other slot 23. can.
- the stator coil 114 is wound in short-pitch winding.
- the U1 phase coil 221 (U1) is inserted into a plurality of slots 23 (hereinafter also referred to as “center slots 23c”) that form a 6-slot pitch (corresponding to the magnetic pole pitch) over the entire circumference of the stator core 112.
- first coil piece p6 the slot accommodating portions 50 on both sides in the circumferential direction are inserted into a pair of center slots 23c forming a 6-slot pitch.
- the coil piece is inserted into the slot 23 means that the slot accommodating portion 50 of the coil piece is inserted into the slot 23.
- the U1 phase coil 221 (U1) has coil pieces (hereinafter referred to as "second coil pieces p4" for differentiation) that are inserted into multiple pairs of slots 23 forming a four-slot pitch.
- second coil pieces p4 the slot accommodating portions 50 on both sides in the circumferential direction are inserted into each pair of slots 23 forming a four-slot pitch.
- the U1 phase coil 221 (U1) has coil pieces (hereinafter referred to as "third coil piece p5" for differentiation) that are inserted into multiple pairs of slots 23 forming a five-slot pitch.
- third coil piece p5 the slot accommodating portions 50 on both sides in the circumferential direction are inserted into each pair of slots 23 forming a five-slot pitch.
- the U1 phase coil 221 (U1) has a coil piece (hereinafter referred to as "fourth coil piece p7" for distinction) that is inserted into a plurality of pairs of slots 23 forming a 7-slot pitch.
- fourth coil piece p7 the slot accommodating portions 50 on both sides in the circumferential direction are inserted into each pair of slots 23 forming a seven-slot pitch.
- each triple slot consisting of three slots 23 adjacent in the circumferential direction with the center slot 23c as the center is a first triple slot 301 and a second triple slot 302 alternately in the circumferential direction.
- the first coil piece p6 to the fourth coil piece p7 are arranged in the following relationship as shown in FIGS. 5 and 6.
- the first coil piece p6 In the U1 phase (U1 phase coil 221 (U1)), the first coil piece p6, A third coil piece p5 and a fourth coil piece p7 are inserted. In this case, the slot accommodating portion 50 of each of the first coil piece p6, the third coil piece p5, and the fourth coil piece p7 on one side in the circumferential direction is inserted into the first center slot 301c.
- the second coil piece p4 is provided in a pair with the first coil piece p6. Therefore, the second coil pieces p4 adjacent to each other in the circumferential direction are inserted into each slot 23 on both sides of the center slot 23c. At this time, the second coil piece p4 and the first coil piece p6 are arranged concentrically around the coil center position CT0.
- only one third coil piece p5 and fourth coil piece p7 are arranged every 12 slot pitches, unlike the first coil piece p6 and second coil piece p4. That is, two first coil pieces p6 and two second coil pieces p4 are each provided between a pair of first center slots 301c (or between a pair of second center slots 302c) adjacent in the circumferential direction. Therefore, only one third coil piece p5 and one fourth coil piece p7 are provided. Further, the third coil piece p5 and the fourth coil piece p7 are arranged on the same one side of both sides in the circumferential direction of the first center slot 301c.
- the first triple slot 301 has six slots in total, four in the first center slot 301c and one in each slot 23 on both sides of the first center slot 301c in the circumferential direction.
- the housing portion 50 is inserted.
- six slot accommodating portions 50 in total are inserted into the second triple slot 302, two in the second center slot 302c and two in each slot 23 on both sides of the second center slot 302c in the circumferential direction. be done.
- the U2-phase coil 221 (U2) is a coil piece (the first It has one coil piece p6).
- the center slot 23c is common to the center slot 23c related to the U1 phase coil 221 (U1).
- the slot accommodating portions 50 on both sides in the circumferential direction are inserted into a pair of center slots 23c forming a 6-slot pitch.
- the U2 phase coil 221 (U2) has a coil piece (second coil piece p4) inserted into a plurality of pairs of slots 23 forming a four-slot pitch.
- the slot accommodating portions 50 on both sides in the circumferential direction are inserted into each pair of slots 23 forming a four-slot pitch.
- the U2 phase coil 221 (U2) has a coil piece (third coil piece p5) inserted into a plurality of pairs of slots 23 forming a 5-slot pitch.
- the slot accommodating portions 50 on both sides in the circumferential direction are inserted into each pair of slots 23 forming a five-slot pitch.
- the U2 phase coil 221 (U2) has a coil piece (fourth coil piece p7) inserted into a plurality of pairs of slots 23 forming a 7-slot pitch.
- the slot accommodating portions 50 on both sides in the circumferential direction are inserted into each pair of slots 23 forming a seven-slot pitch.
- the configuration of the U2 phase coil piece is approximately the same as the configuration of the U1 phase coil piece, but the detailed shape may be different.
- the first coil piece p6 of the U2 phase may have a slightly different shape from the second coil piece p4 of the U1 phase.
- each coil piece in the first triple slot 301 is different from the above-mentioned U1 phase (U1 phase coil 221 (U1)).
- the configuration (arrangement and direction of current) of each coil piece in the second three-slot 302 is substantially reversed.
- the first coil piece p6, the third coil piece p5, and the fourth coil piece p7 are inserted into the second center slot 302c.
- the slot accommodating portions 50 of the first coil piece p6, the third coil piece p5, and the fourth coil piece p7 on the other side in the circumferential direction are inserted into the second center slot 302c.
- the second coil piece p4 is provided in a manner to form a pair with the first coil piece p6. Therefore, the second coil pieces p4 adjacent to each other in the circumferential direction are inserted into each slot 23 on both sides of the center slot 23c. At this time, the second coil piece p4 and the first coil piece p6 are arranged concentrically around the coil center position CT0.
- only one third coil piece p5 and fourth coil piece p7 are arranged every 12 slot pitches, unlike the first coil piece p6 and second coil piece p4. That is, two first coil pieces p6 and two second coil pieces p4 are each provided between a pair of first center slots 301c (or between a pair of second center slots 302c) adjacent in the circumferential direction. Therefore, only one third coil piece p5 and one fourth coil piece p7 are provided. Further, the third coil piece p5 and the fourth coil piece p7 are arranged on the same one side of both sides in the circumferential direction of the first center slot 301c. This point is similar to the U1 phase coil 221 (U1).
- the first triple slot 301 has six slots, two in the first center slot 301c and two in each slot 23 on both sides of the first center slot 301c in the circumferential direction.
- the housing portion 50 is inserted.
- six slot accommodating portions 50 are inserted, four in the second center slot 302c and one in each slot 23 on both sides of the second center slot 302c in the circumferential direction. be done.
- the arrangement of the slot accommodating portion 50 of each coil piece in the first triple slot 301 (and the direction of the current), and the arrangement of each coil in the second triple slot 302 The arrangement of the slot accommodating portions 50 (and the direction of the current) of the two pieces are reversed. That is, if one is shifted by six slots and also reversed in the radial direction, it will overlap with the other.
- each coil piece of the stator coil 114 is joined to each other on one side in the axial direction.
- each pair of slots 23 into which each pair of coil pieces to be joined in each phase is inserted is spaced apart in the circumferential direction by a certain number of slots.
- each pair of slots 23 into which each pair of coil pieces to be joined in each phase is inserted is 5 slots, as shown in FIGS. 3 and 6 (see welding section 60). separated by a minute. This allows welding locations to be set at a constant pitch on the welding side (lead side), making it easier to improve the efficiency of the welding process.
- the coil end portion formed by the first coil piece p6 (the portion axially outer than the axial end surface of the stator core 112) is replaced by the coil end portion formed by the second coil piece p4. Extends axially outward from the end portion. This is the same for both the U1 phase coil 221 (U1) and the U2 phase coil 221 (U2). Thereby, it is possible to reduce the size of the coil end portion of the entire stator coil 114.
- FIG. 8 is an explanatory diagram of the stator coil 114' according to a comparative example, with the upper side showing the configuration of the U1 phase coil 221 (U1)', and the lower side showing the configuration of the U2 phase coil 221 (U2)'.
- FIG. 8 shows the configuration of a general part of a comparative example corresponding to FIG. 5.
- FIG. 9 is an explanatory diagram of a circulating current
- FIG. 10 is an explanatory diagram of a current waveform based on the analysis results of a comparative example.
- the horizontal axis represents the rotor rotation angle (electrical angle), and the current waveforms of each phase are shown for 360 degrees.
- FIG. 10 the horizontal axis represents the rotor rotation angle (electrical angle), and the current waveforms of each phase are shown for 360 degrees.
- FIG. 11 is an explanatory diagram of torque waveforms (torque waveforms at specific operating points A and B) based on the analysis results of the comparative example.
- the horizontal axis represents the rotor rotation angle (electrical angle), and each torque waveform for 360 degrees is shown.
- FIG. 12 is an explanatory diagram of a current waveform based on the analysis results of this example, and is compared with FIG. 10.
- FIG. 13 is an explanatory diagram of torque waveforms (torque waveforms at specific operating points A and B) based on the analysis results of this example, and is compared with FIG. 11.
- the stator coil 114' is wound with a short winding, and the arrangement of the slot accommodating portion 50 of each coil piece in the first triple slot 301 (the arrangement for six turns) is
- the arrangement of the slot accommodating portions 50 of each coil piece in the slot 302 (the arrangement for six turns) itself is the same as in this embodiment.
- the U1 phase coil 221 (U1)' and the U2 phase coil 221 (U2)' are wound so as to be shifted from each other by one slot.
- the circumferential coil center CT1' of the U1 phase coil 221 (U1)' related to each magnetic pole and the circumferential coil center CT2' of the U2 phase coil 221 (U2)' related to each magnetic pole are respectively the magnetic poles. It deviates by a certain amount from the coil center position CT0 in the circumferential direction for each pitch. Specifically, as shown in FIG. 8, the circumferential coil center CT1' of the U1 phase coil 221 (U1)' is shifted to one side in the circumferential direction with respect to the coil center position CT0 (see arrow R81).
- each coil center CT1' of the U1 phase is shifted to one side in the circumferential direction with respect to each coil center position CT0
- each coil center CT2' of each U2 phase is shifted to one side in the circumferential direction with respect to each coil center position CT0. If it shifts to the other side in the circumferential direction, a circulating current that circulates within the loop of U1 phase coil 221 (U1)' and U2 phase coil 221 (U2)' that are connected in parallel is likely to occur. Specifically, as schematically shown in FIG. 10, a current flows through the parallel-connected U1 phase coil 221 (U1)' (see current I1 in FIG. 10) and a current flows through the U2 phase coil 221 (U2)'.
- each coil center CT1 of the U1 phase coincides with each coil center position CT0.
- each coil center CT2 of the U2 phase coincides with each coil center position CT0.
- FIG. 14 is a winding diagram of a part of the stator coil 114A according to the second embodiment, and the view of the diagram is the same as that of FIG. 3.
- stator coil 114A is wound with a short winding, and the arrangement of the slot accommodating portion 50 of each coil piece in the first triple slot 301 and the arrangement of each coil piece in the second triple slot 302 are different.
- the arrangement of the slot accommodating portion 50 itself is the same as in the first embodiment described above.
- the U1 phase coil 221A (U1) includes a plurality of fifth coil pieces c5 inserted into a plurality of pairs of slots 23 forming a seven slot pitch (slot pitch one slot larger than the magnetic pole pitch).
- the U1 phase coil 221A (U1) includes a plurality of sixth coil pieces c6 inserted into a plurality of pairs of slots 23 forming a five slot pitch (slot pitch one slot smaller than the magnetic pole pitch).
- each triple slot consisting of three slots 23 adjacent in the circumferential direction with the center slot 23c as the center is a first triple slot 301 and a second triple slot 302 alternately in the circumferential direction.
- the fifth coil piece c5 and the sixth coil piece c6 are arranged in the following relationship.
- the fifth coil piece c5 and the sixth coil piece c6 are inserted into the center slot 23c (first center slot 301c) of the first triple slot 301, and A fifth coil piece c5 and a sixth coil piece c6 are inserted into the slots 23 on both sides of the second triple slot 302.
- the slot accommodating part 50 on one side in the circumferential direction is inserted into the center slot 23c related to the first triple slot 301, and the slot accommodating part 50 on the other side in the circumferential direction is inserted into the center slot 23c related to the first triple slot 301.
- the slot 302 is inserted into the slot 23 on one side in the circumferential direction with respect to the center slot 23c.
- the U2 phase coil 221A (U2) like the above-mentioned U1 phase coil 221A (U1), includes a plurality of fifth coil pieces c5 inserted into a plurality of pairs of slots 23 forming a 7-slot pitch. Further, the U2 phase coil 221A (U2) includes a plurality of sixth coil pieces c6 inserted into a plurality of pairs of slots 23 forming a five-slot pitch.
- each coil piece in the first triple slot 301 is different from the above-mentioned U1 phase (U1 phase coil 221A (U1)).
- the configuration (arrangement and direction of current) of each coil piece in the second three-slot 302 is substantially reversed.
- the fifth coil piece c5 and the sixth coil piece c6 are inserted into the second central slot 302c of the second triple slot 302, and A fifth coil piece c5 and a sixth coil piece c6 are inserted into the slots 23 on both sides of the first triple slot 301.
- the first triple slot 301 in the U2 phase, in the first triple slot 301, three slot accommodating portions 50 in total are inserted into the slots on both sides of the first central slot 301c, six in total.
- the first triple slot 301 no slot accommodating portion 50 is inserted into the first central slot 301c.
- the second triple slot 302 six slot accommodating portions 50 are inserted into the second central slot 302c.
- no slot accommodating portion 50 is inserted into the slots 23 on both circumferential sides of the second central slot 302c.
- the arrangement of the slot accommodating portion 50 of each coil piece in the first triple slot 301 (and the direction of the current), and the arrangement of each coil in the second triple slot 302 The arrangement of the slot accommodating portions 50 (and the direction of the current) of the two pieces are reversed. That is, if one is shifted by six slots and also reversed in the radial direction, it will overlap with the other.
- each pair of slots 23 into which each pair of coil pieces to be joined in each phase is inserted is spaced apart in the circumferential direction by a certain number of slots.
- each pair of slots 23 into which each pair of coil pieces to be joined in each phase is inserted is spaced apart by five slots, as shown in FIG. 14 and the like. This allows welding locations to be set at a constant pitch on the welding side (lead side), making it easier to improve the efficiency of the welding process.
- the types of coil pieces forming the general portion can be reduced. That is, in the first embodiment described above, there are four types of coil pieces that form the general part, even if the slot pitch is different (although the slot pitch may be the same, the detailed parts of the coil pieces may be different). In this embodiment, two types are sufficient for differences in slot pitch. In this way, according to the present embodiment, it is possible to reduce the types of coil pieces for forming the stator coil 114A, and improve manufacturing efficiency.
- FIG. 15 like FIG. 6 described above, is a side view (a side view viewed in the radial direction from the radial inside) showing a method of arranging the coil pieces forming the general part of the stator coil 114A according to the second embodiment.
- the current flowing through the stator coil 114A at a certain point in time is schematically shown by an arrow R5.
- FIG. 15 schematically shows a welded portion 60 between coil pieces.
- FIG. 15 is also an explanatory diagram of the effect of reducing circulating current according to this embodiment, and shows the relationship between the coil centers CT1 and CT2 of the stator coil 114A and the above-mentioned coil center position CT0 (coil center position CT0 for each magnetic pole pitch). Show relationships.
- FIG. 15 is also an explanatory diagram of the effect of reducing circulating current according to this embodiment, and shows the relationship between the coil centers CT1 and CT2 of the stator coil 114A and the above-mentioned coil center position CT0 (coil center position CT0
- FIG. 15 shows a winding diagram of the general part in the same manner as FIG. 14.
- the coil centers CT1 of the coils U1-2 and U1-3 are representatively shown for the U1 phase, but the same applies to the other coils U1-1, U1-4 to U1-8. . This also applies to the U2 phase.
- each coil center CT1 of the U1 phase (the coil center of each coil U1-1 to U1-8) is circumferentially arranged on one side and the other side with respect to each coil center position CT0.
- the coil center CT1 of the coil U1-2 is shifted by the same amount alternately along the circumferential direction (coil U1-3) with respect to the corresponding coil center position CT0. (closer side) by a certain amount ⁇ d (for example, half of one slot pitch).
- the coil center CT1 of the coil U1-3 is shifted by a certain amount ⁇ d toward the other side in the circumferential direction (the side closer to the coil U1-2) with respect to the corresponding coil center position CT0.
- the amount of deviation is the same by a certain amount ⁇ d, and the direction of deviation is alternately opposite in the circumferential direction, so that they are canceled out and a circulating current is less likely to occur.
- the coil center CT2 of the coil U2-2 is shifted by a certain amount ⁇ d to one side in the circumferential direction (the side far from the coil U2-3) with respect to the corresponding coil center position CT0.
- the coil center CT2 of the coil U2-3 is shifted by a certain amount ⁇ d to the other side in the circumferential direction (the side far from the coil U1-2) with respect to the corresponding coil center position CT0.
- the amount of deviation is the same by a certain amount ⁇ d, and the direction of deviation is alternately opposite in the circumferential direction, so that they are canceled out and a circulating current is less likely to occur.
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Abstract
Description
相ごとに複数のコイル片が前記ステータコアに全周にわたり組み付けられることで、形成されるステータコイルとを含み、
前記ステータコイルは、相ごとに2組が並列で結線され、かつ、短節巻きで巻装され、
相ごとに、第1組のコイルの周方向のコイル中心と、第2組のコイルの周方向のコイル中心は、それぞれ、
相ごとのコイル中心位置であって、前記ステータコアに全周にわたって磁極ピッチごとに形成される各コイル中心位置に一致する、又は、
磁極ピッチごとの前記コイル中心位置に対して一方側と他方側とに周方向に沿って交互に同量ずれる、回転電機用ステータが提供される。
図1は、本実施例の回転電機用ステータ10の概略を示す図である。回転電機用ステータ10は、ステータコア112と、ステータコイル114とを有する。ステータコア112は、中心軸Iを有する円筒状の形態であり、例えば積層鋼板により形成されてよい。ステータコイル114の構成は、以下で詳説する。
次に、図14を参照して、他の実施例(以下、区別のため、「実施例2」と称する)に付いて説明する。
Claims (5)
- 複数のスロットを有するステータコアと、
相ごとに複数のコイル片が前記ステータコアに全周にわたり組み付けられることで、形成されるステータコイルとを含み、
前記ステータコイルは、相ごとに2組が並列で結線され、かつ、短節巻きで巻装され、
相ごとに、第1組のコイルの周方向のコイル中心と、第2組のコイルの周方向のコイル中心は、それぞれ、
相ごとのコイル中心位置であって、前記ステータコアに全周にわたって磁極ピッチごとに形成される各コイル中心位置に一致する、又は、
磁極ピッチごとの前記コイル中心位置に対して一方側と他方側とに周方向に沿って交互に同量ずれる、回転電機用ステータ。 - 前記ステータコイルは、軸方向の一方側で複数の前記コイル片が互いに接合され、
各相において接合される各対のコイル片が挿入される各対のスロットは、一定数のスロット分だけ周方向で離間する、請求項1に記載の回転電機用ステータ。 - 複数の前記コイル片は、相ごとに、複数の第1コイル片と、複数の第2コイル片とを含み、
複数の前記第1コイル片は、磁極ピッチごとの前記コイル中心位置を中心として周方向両側に配置される複数の中心スロットであって、磁極ピッチに対応するスロットピッチを形成する複数の中心スロットに、挿入され、
複数の前記第2コイル片は、前記ステータコアに全周にわたって前記コイル中心位置を中心として配置される複数対のスロットであって、磁極ピッチよりも2スロット分だけ小さいスロットピッチを形成する複数対のスロットに、挿入され、
前記第1コイル片によるコイルエンド部は、前記第2コイル片によるコイルエンド部よりも軸方向外側に延在する、請求項1に記載の回転電機用ステータ。 - 複数の前記コイル片は、相ごとに、複数の第3コイル片と、複数の第4コイル片とを更に含み、
複数の前記第3コイル片は、磁極ピッチよりも1スロット分だけ大きいスロットピッチを形成する複数対のスロットに挿入され、
複数の前記第4コイル片は、磁極ピッチよりも1スロット分だけ小さいスロットピッチを形成する複数対のスロットに挿入され、
相ごとに、前記中心スロットを中心として周方向に隣接する3つのスロットからなる各3連スロットを、周方向で交互に第1の3連スロット及び第2の3連スロットとした場合、
前記第1組において、相ごとに、前記第1の3連スロットの前記中心スロットに、前記第1コイル片、前記第3コイル片、及び前記第4コイル片が挿入され、
前記第1組において、相ごとに、前記第2の3連スロットの前記中心スロットに、前記第1コイル片だけが挿入され、
前記第2組において、相ごとに、前記第1の3連スロットの前記中心スロットに、前記第1コイル片だけが挿入され、
前記第2組において、相ごとに、前記第2の3連スロットの前記中心スロットに、前記第1コイル片、前記第3コイル片、及び前記第4コイル片が挿入される、請求項3に記載の回転電機用ステータ。 - 複数の前記コイル片は、相ごとに、複数の第5コイル片と、複数の第6コイル片とを含み、
複数の前記第5コイル片は、磁極ピッチよりも1スロット分だけ大きいスロットピッチを形成する複数対のスロットに挿入され、
複数の前記第6コイル片は、磁極ピッチよりも1スロット分だけ小さいスロットピッチを形成する複数対のスロットに挿入され、
相ごとに、前記ステータコアに全周にわたって磁極ピッチを形成する複数の中心スロットのそれぞれを中心として周方向に隣接する3つのスロットからなる各3連スロットを、周方向で交互に第1の3連スロット及び第2の3連スロットとした場合、
前記第1組において、相ごとに、前記第1の3連スロットの前記中心スロットに、前記第5コイル片が挿入され、かつ、前記第2の3連スロットの両側のスロットに、前記第5コイル片及び前記第6コイル片が挿入され、
前記第2組において、相ごとに、前記第2の3連スロットの前記中心スロットに、前記第5コイル片が挿入され、かつ、前記第1の3連スロットの両側のスロットに、前記第5コイル片及び前記第6コイル片が挿入される、請求項1に記載の回転電機用ステータ。
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|---|---|---|---|
| US18/836,433 US20250141283A1 (en) | 2022-04-21 | 2023-04-14 | Stator for rotating electrical machine |
| CN202380034421.3A CN119032495A (zh) | 2022-04-21 | 2023-04-14 | 旋转电机用定子 |
| EP23791798.4A EP4513721A4 (en) | 2022-04-21 | 2023-04-14 | STATOR OF ROTATING ELECTRIC MACHINE |
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| JP2022070412A JP7687265B2 (ja) | 2022-04-21 | 2022-04-21 | 回転電機用ステータ |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012222983A (ja) * | 2011-04-11 | 2012-11-12 | Hitachi Automotive Systems Ltd | 固定子および回転電機 |
| WO2017014062A1 (ja) * | 2015-07-22 | 2017-01-26 | 日立オートモティブシステムズ株式会社 | 回転電機の固定子及び回転電機 |
| JP2018099010A (ja) * | 2016-12-15 | 2018-06-21 | スズキ株式会社 | 回転電機 |
| JP2021141774A (ja) | 2020-03-09 | 2021-09-16 | 日立Astemo株式会社 | 回転電機の固定子、回転電機、および車両駆動装置 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11575288B2 (en) * | 2020-01-13 | 2023-02-07 | Ford Global Technologies, Llc | Hairpin winding electric machine |
| JP7484467B2 (ja) * | 2020-06-12 | 2024-05-16 | 株式会社デンソー | 回転電機 |
-
2022
- 2022-04-21 JP JP2022070412A patent/JP7687265B2/ja active Active
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2023
- 2023-04-14 WO PCT/JP2023/015152 patent/WO2023204150A1/ja not_active Ceased
- 2023-04-14 US US18/836,433 patent/US20250141283A1/en active Pending
- 2023-04-14 CN CN202380034421.3A patent/CN119032495A/zh active Pending
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012222983A (ja) * | 2011-04-11 | 2012-11-12 | Hitachi Automotive Systems Ltd | 固定子および回転電機 |
| WO2017014062A1 (ja) * | 2015-07-22 | 2017-01-26 | 日立オートモティブシステムズ株式会社 | 回転電機の固定子及び回転電機 |
| JP2018099010A (ja) * | 2016-12-15 | 2018-06-21 | スズキ株式会社 | 回転電機 |
| JP2021141774A (ja) | 2020-03-09 | 2021-09-16 | 日立Astemo株式会社 | 回転電機の固定子、回転電機、および車両駆動装置 |
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| Title |
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| See also references of EP4513721A4 |
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| CN119032495A (zh) | 2024-11-26 |
| JP7687265B2 (ja) | 2025-06-03 |
| JP2023160219A (ja) | 2023-11-02 |
| EP4513721A1 (en) | 2025-02-26 |
| US20250141283A1 (en) | 2025-05-01 |
| EP4513721A4 (en) | 2025-08-13 |
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