JPH11113202A - Cooling structure of rotor with permanent magnet - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To suppress a decrease in output due to a rise in temperature of a field iron core or a permanent magnet of a rotor with a permanent magnet. The A field iron bars pieces 1 are embedded a plurality pieces of permanent magnet 2 to the composed field core laminate, the outside of the end plate 4 for fixing the field iron bars arranged on both sides of the field core A plurality of blade pieces 5 are provided on the side surface, and the armature windings 1 on the outer side are provided by the blade pieces 5.
7, a cooling air flow path is formed by providing a gap between the inner surface of the end plate 4 and the outer surface of the field iron core. At both ends of the permanent magnet, an axial ventilation passage 3a is disposed in contact with the surface of the permanent magnet, and cooling air is sucked in from one end plate side through the ventilation passage 3a, and the other end plate is cooled. In order to form a cooling passage so as to discharge from the side, a suction port 6 and a discharge port 7 are provided in each end plate, and cooling air is brought into direct contact with the surface of the field iron core or the permanent magnet to cool.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for a rotor with a permanent magnet in which a permanent magnet is embedded in a field iron core of a rotor such as a generator.

[0002]

2. Description of the Related Art A generator having a field core formed by laminating field core pieces each having a storage hole in which a permanent magnet is embedded at a position close to the outer periphery and having a permanent magnet embedded in the storage hole is provided. In the rotor, the field iron core is heated by radiant heat from the armature as the generator operates, and the radiant heat lowers the output of the generator due to a rise in the temperature of the permanent magnet.

As described above, in the conventional rotor, the flow of cooling air in the field core in which the field core pieces are stacked is insufficient, the cooling efficiency is low, and an increase in the output of the generator cannot be expected. In particular, in the case where the permanent magnet was embedded, the temperature rise was remarkable.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to reduce the temperature of a field iron core forming a rotor or a permanent magnet embedded in a field iron core due to radiant heat from an armature. An object of the present invention is to provide a cooling structure for a rotor with a permanent magnet, in which a field iron core and a permanent magnet are efficiently cooled in order to improve a decrease in output, and a decrease in output of a generator due to an increase in temperature is suppressed.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a plurality of permanent magnets embedded in a field core formed by laminating field core pieces. A plurality of blades are provided on an outer surface of an end plate which is disposed on both sides of the core and fixes the field core, and a rotation with a permanent magnet which causes a flow of cooling air to an armature winding on the outside by the blades is provided. A gap is provided between the inner surface of the end plate and the outer surface of the field iron core to form a cooling air flow path, and both ends of the permanent magnet of the field iron are in contact with the surface of the permanent magnet. In order to form cooling passages, cooling air is sucked in from one end plate side and discharged from the other end plate side through the ventilation passages. The above object can be achieved by a configuration in which a suction port and a discharge port are provided.

[0006] Further, a concave groove provided with a suction port which is closed on the outer peripheral surface side and opened on the axial center side is formed on the inner side surface of the outer peripheral edge of both end plates of the field iron core, The recesses having discharge ports each having an open surface are alternately arranged at equal intervals, and the recesses of the other end plate are arranged opposite to the positions of the recessed grooves of one end plate. A magnetic core is sandwiched between both end plates, and ventilation paths formed at both ends of a permanent magnet embedded in a long hole formed in the field iron core piece face the recesses and grooves of the end plate. The fan around the concave groove and the concave peripheral protrusion formed radially from the outer wing pieces and the axis of the both end plates with the rotation of the rotor and fixed from both side surfaces of the core. By the effect, cooling air is discharged to the outer peripheral side from a gap formed between the inner side surface of the end plate and the outer side surface of the field core, and The field core and the permanent magnet are sucked from the suction port of the groove, pass through the ventilation passage formed at both ends of the permanent magnet, and are discharged from the discharge port of the end plate recess on the opposite side to the groove. The above object can be achieved by a cooling configuration.

Further, a plurality of partition walls are provided between the concave groove provided inside the end plate and the concave portion or between the suction ports of the end plate.
When the height of the partition wall is the same as the height of the protrusion around the concave groove or the recess, and when this end plate is sandwiched from both sides of the laminated field core, the outside of the field core contacting this end plate This can be achieved by a configuration in which a gap is formed with the side surface, and cooling air is discharged from the gap as the rotor rotates.

In the cooling structure for a rotor with permanent magnets according to the present invention, a plurality of permanent magnets are buried in a field core formed by laminating field core pieces, and the permanent magnets are arranged on both side surfaces of the field core. A rotor with permanent magnets, comprising a plurality of blades on an outer surface of an end plate for fixing a magnetic core, and generating a flow of cooling air to an outer armature winding by the wings, the outer surface of the end plate. A baffle that protrudes in the rotation direction on one end plate and an anti-rotation direction on the other end plate is arranged on the outer peripheral edge of the plurality of wing pieces protruding at equal intervals in the vicinity of this baffle plate. Vent holes are drilled on the axial center side, and the positions of the vent holes on both end plates are made to coincide with the ventilation holes at both ends where permanent magnets of the field core formed by laminating the field core pieces are embedded. And the end plate that protrudes in the direction of rotation with the rotation of the rotor. Cooling air that has found the through air passage at both ends of the permanent magnet, a structure for cooling the opposite flow magnetic iron-core and the permanent magnet field to form a cooling air discharges from the vent.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A generator (welding generator) using a rotor with a permanent magnet according to the present invention will be described below. In the cooling structure of the rotor with the permanent magnet of the present invention, the blade pieces protrude from the outer surfaces of both end plates of the rotor, and cooling air flows between the inner surface of the end plate and the outer surface of the field core. Since a ventilation path is formed at both ends of the permanent magnet embedded in the field core while forming a gap, as shown in FIG. 13, cooling air is forced to flow in from the intake hole of the outer casing cover. A part of the cooling air flows into the clearance between the outer surface of the field core inside the end plate and the inlet of the groove, and passes through the outer surface of the field core to the permanent magnet. Through the adjacent ventilation passages (see FIG. 12), while cooling the field iron core and the permanent magnets, via the outer recesses on the inner surface of the opposite end plate (rear surface). To the outside through the discharge port, directly cooling the surface of the permanent magnet as well as the field iron core. Suppress a decrease in the output of the generator because it can be.

Another part of the cooling air forms a gap between the outer surface of the field iron core of the rotor and the inner surfaces of the front and rear end plates, which serves as a ventilation path due to peripheral projections such as partition walls and concave grooves. As a result, the partition wall, the concave groove, and the protrusion around the concave portion exert the same effect as the blade of the fan (fan effect), and discharge from the center of the field core to the outside through this gap, and The cooling efficiency of the side of the magnetic core and the side of the permanent magnet is improved. Furthermore, the end plates fixed to both sides of this field iron core are:
Since the grooves and recesses are alternately arranged on the inner surface at equal intervals, if one is inverted and shifted by one pitch around the axis center, the grooves and recesses can be assembled facing each other, so the shape of the end plates will be Can be identical. Therefore, both end plates can be manufactured by one mold. In addition, the cooling structure of the rotor with the permanent magnet of the present invention has a structure in which the outer peripheral edges of the blades on both side end plates are provided in order to take in more cooling air into the ventilation passage formed at both ends of the permanent magnet of the field iron core. The cooling air can be taken into the ventilation hole by the overhanging baffle plate, and can be discharged to the outside through the ventilation passage of the permanent magnet through the ventilation hole of the opposite end plate, so that the cooling efficiency can be improved. . In addition, a reinforcing flange is formed on the outer peripheral surface on the inner peripheral side (axial side peripheral edge) of the end plate, and the flatness of the end plate is maintained by this flange, and the field core is firmly fixed from both sides. Can be.

FIG. 1 is a side view of a partial cross section of a rotor with a permanent magnet according to the present invention. FIG. 2 is a plan view of a field iron core piece used in the rotor with a permanent magnet of the present invention. FIG. 3 is a partially enlarged plan view of the outer peripheral edge of the field iron core of the rotor with permanent magnet of the present invention. FIG. 4 is a perspective view of a rotor with a permanent magnet of the present invention. FIG. 5 is a perspective view of an end plate of the rotor with a permanent magnet of the present invention. FIG. 6 is a plan view of the inside surface of FIG. FIG.
6A is a cross-sectional view of the end plate of FIG. 6, FIG.
(B) is GG sectional drawing, (c) is HH sectional drawing.
8 to 11 are partially enlarged cross-sectional views of the rotor with permanent magnet of the present invention. FIG. 12 is an enlarged view as viewed from an arrow E in FIG. FIG. 13 is a partial cross-sectional side view of a generator incorporating the rotor with a permanent magnet of the present invention. FIG. 14 is a front view of the rotor with permanent magnets provided with an outer casing cover. FIG. 15 is a partially enlarged plan view of another embodiment of the field iron core of the present invention.
FIG. 16 is an outer side view in which a baffle plate is provided on an end plate used in the rotor with a permanent magnet of the present invention. FIG. 17 is an inner side view of FIG. FIG. 18 is an explanatory diagram showing the flow of air in the rotor with permanent magnets of FIG.

Reference numeral 1 denotes a field core piece in which a plurality of long through holes 3 for burying a permanent magnet 2 are formed in the vicinity of the outer periphery, and a plurality of general trapezoidal holes are formed. is there. By laminating a plurality of these, and inserting the permanent magnet 2 into the through hole 3, the ends 3a, 3a are formed at both ends. Cooling air flows through the trapezoidal hole in the through-hole in the field core in which the field core pieces 1 are stacked. Reference numeral 4 denotes an end plate sandwiched from both sides of the field core in which the field core pieces 1 are stacked. On the outer periphery of the end plate 4, wing pieces 5 are provided projecting at equal intervals.
A concave groove 6 having a predetermined width whose axial side is open and its outer peripheral side is closed, and recesses 7 whose outer peripheral side is open and its axial side is closed are formed at equal intervals on the inner side surface. These grooves 6 and recesses 7
Are alternately arranged at equal intervals adjacent to each other. In this alternate arrangement, two grooves 6 are adjacent to each other as shown in FIG.
Two recesses 7 may be arranged next to and adjacent to each other. This number is determined in consideration of the balance of the field core pieces 1.

Reference numeral 8 denotes a partition wall protruding from the end plate 4 at a predetermined interval. The height of the peripheral protrusion 6a of the concave groove 6, the peripheral protrusion 7a of the recess 7 and the height of the partition wall 8 are the same, and are in contact with the side surfaces of the field iron core piece 1. A gap 21 surrounded by the partition wall 8 and each of the peripheral projections 6a, 7a is adapted to generate an air flow between the side wall of the field iron core piece 1. Reference numeral 10 denotes a bolt hole provided in the end plate 4 into which the bolt 9 for fixing the field iron core piece 1 is inserted. Reference numeral 11 denotes an outer casing cover surrounding the rotor, and a large number of intake holes 12 and exhaust holes 13 for taking in air are formed. The field core piece 1 is formed by radially arranging a caulking portion 14, a guide groove 15 when the field core pieces 1 are stacked and assembled, and the field core piece 1.
A mark groove 16 for visually recognizing the reversal situation is formed. A flange 22 is provided to protrude outside the inner peripheral side of the end plate 4.

A cooling structure for a rotor with a permanent magnet according to the present invention will be described with reference to the drawings. Through hole 3 in field iron core piece 1
Are formed so that both ends are narrower than the central portion, and a step is provided to position the permanent magnet 2 to be inserted therein, and the ends 3a, 3a are formed at both ends. An oblique line 3b is formed on the outer peripheral side of the end portions 3a of the through-hole 3, and the strength of the field iron core piece 1 on the outer peripheral edge is maintained.
The space 1a between the through holes 3 and 3 'is provided to be narrow. A rectangular permanent magnet 2 is loaded in a wide part of the central portion of the through hole 3. The shape of the permanent magnet 2 is not specified. A plurality of the field core pieces 1 are stacked along the guide groove 15, and the field core pieces 1 are inverted and stacked to form a plurality of field irons while confirming with the mark grooves 16. The end plate 4 is sandwiched from both front and rear sides of the field core with the wing pieces 5 outside, and bolts 9 are inserted into bolt holes 10 and fixed. At this time, the rear end plate 4 is positioned so that the recess 7 of the rear end plate 4 faces the inner concave groove 6 of the front end plate 4. That is, the position of the inner surface of the end plate 4 having the same shape is opposed to one pitch position (see FIG. 1), and the field iron core is sandwiched and fixed. These recesses 6 and recesses 7 are formed at the ends 3a, 3 'of the through hole 3 of the field iron core piece 1 and the through hole 3' adjacent thereto.
a (see FIG. 12).

The cooling structure of the rotor with a permanent magnet according to the present invention comprises one groove 6 provided in the end plate 4, the end 3a of the through hole 3 of the field core piece 1 and the end 3 of the through hole 3 '. The end 3a, 3'a corresponds to one recess 7 of the rear end plate 4, and a discharge port is opened on the outer peripheral surface. As a result, all the grooves 6 and the recesses 7 of the end plate 4 communicate with each other through the ends 3a and 3'a of the field iron core piece 1 (see FIG. 12). With such a configuration, when the rotor rotates, the cooling air is generated by the fan effect caused by the rotation of the blade pieces 5 protruding from the outer surface of the end plate 4, the partition walls 8 on the inner surface, and the peripheral protrusions 6a, 7a. Is sucked from the air intake hole 12 of the outer casing cover 11 and is sucked into the through passage formed by the trapezoidal hole of the field core. A part of the cooling air is sucked in from the shaft center side of the rotor, enters through the concave groove 6 of the end plate 4, and the particles such as air inside are pushed out by centrifugal force. Through the end portions 3a and 3'a of the through holes 3 and 3 ', the gas is discharged from the discharge port on the outer peripheral side of the recess 7. Another part of the cooling air generates a flow of wind passing through the gap 21 surrounded by the partition wall 8, the peripheral protrusions 6 a of the respective concave grooves 6, and the peripheral protrusions 7 a of the respective concave portions 7. Therefore, the surface of the permanent magnet 2 is directly cooled, and the wind of the cooling air also cools the armature winding 17 outside the rotor.

The flow of the cooling air that has flowed through the air intake holes 12 of the outer casing cover 11 is mainly applied to the surface of the field core piece 1 by the wing pieces 5 of the end plate 4 as shown in FIG. While contacting, the air is exhausted to the outer armature winding 17 side. On the other hand, part of the cooling air is discharged from the inner recess 7 through the concave groove 6 and the ventilation passage of the ends 3a and 3'a of the adjacent through holes 3 and 3 '(see FIG. 9). . Further, the other part is discharged from the concave groove 6 of the inner end plate 4 through the through holes 3 and 3 'and from the outer concave portion 7 (see FIG. 10). Furthermore,
The other part passes through the gap 21 defined by the partition wall 8 of the front and rear end plates 4 and the respective peripheral protrusions 6a, 7a of the respective concave grooves 6, and the respective concave portions 7, and the side surface of the field iron core piece 1 and the permanent Magnet 2
The ink is discharged outward while directly contacting the side surface (see FIG. 11). By the flow of the cooling air, the side surface of the field iron core piece 1 and the side surface of the permanent magnet 2 are directly cooled, so that the cooling efficiency is excellent and the temperature rise thereof can be suppressed. FIG. 9-
The arrow 12 indicates the flow of the wind. 12 indicate the direction in which wind is flowing from the back side to the front side of the drawing.

In the rotor with a permanent magnet of the present invention, both ends of the through hole 3 are formed narrower than the center portion as positioning means for positioning the permanent magnet 2, and a step is provided. The permanent magnet 2 can be fixed by inserting the non-magnetic member 18 while leaving a partial space, that is, a ventilation path that forms a passage for the cooling air, at the both ends 3a, 3a (see FIG. 15). In this case, the non-magnetic body 18 is fixed to the axial center side of the end 3a. The non-magnetic member 18 is attached to both ends of the permanent magnet 2 so as to be fixed. By positioning with such a non-magnetic body 18, the permanent magnet 2 to be inserted into the through hole 3 can be of various sizes and different sizes, regardless of the size of the through hole 3.

As shown in FIG. 16, a baffle plate 19 is attached to the outer peripheral edge of each wing piece 5 of the end plate 4 on both sides of the rotor by extending the baffle plate 19 in the direction of rotation. A vent hole 20 is formed below the plate 19, that is, on the axial center side. By sandwiching the front and rear end plates 4 from both sides of the field iron core, the other end plate 4 prevents the baffle plate 1 in the anti-rotation direction.
9 will overhang. When the rotor with a permanent magnet thus formed rotates, it is sucked from the ventilation port 20 by the baffle plate 19 of the wing piece 5, passes through the adjacent ends 3 a, 3 ′ a forming the ventilation path of the permanent magnet 2, and faces each other. The cooling air is discharged from the ventilation port 20 of the side end plate 4 (see FIG. 18). By such a flow of wind, the side surfaces of the field core and the permanent magnet 2 are directly cooled, and the cooling efficiency can be improved.

As shown in FIG. 15, a baffle plate 19 extends in the rotational direction on each wing 5 of the end plate 4, so that cooling air is sucked in from one direction and flows to the opposite side. The vent hole 20 is formed at a position slightly apart from the position of the wing piece 5 and close to the baffle plate 19 in view of the strength of the wing piece 5.

The rotor with permanent magnets of the present invention has a laminated field even if a gap is provided between the field iron core and both end plates with the same height of the partition wall, the concave groove and the peripheral projection of the concave portion. The magnetic core is firmly fixed, and the permanent magnet can be positioned in the axial direction.

[0021]

According to the cooling structure of the rotor with permanent magnet of the present invention, the cooling air flows in contact with the field core, and in particular, the cooling air flows in direct contact with the buried permanent magnet, so that the cooling air flows. Since not only the magnetic core pieces but also the permanent magnets can be cooled, the temperature rise of the field iron core and the like due to the radiant heat from the armature can be suppressed, and the decrease in the output of the generator can be suppressed. Further, since end plates having the same shape are used on both sides of the field iron core, there is an advantage that not only the combination is easy but also a single mold is required.

[Brief description of the drawings]

FIG. 1 is a side view of a partial cross section of a rotor with a permanent magnet of the present invention.

FIG. 2 is a plan view of a field iron core piece used in the rotor with a permanent magnet of the present invention.

FIG. 3 is a partially enlarged plan view showing a state where a permanent magnet is embedded in a field core of a rotor with a permanent magnet according to the present invention.

FIG. 4 is a perspective view of a rotor with a permanent magnet of the present invention.

FIG. 5 is a perspective view of an end plate of the rotor with a permanent magnet of the present invention.

FIG. 6 is a plan view of the inside surface of FIG. 5;

7A and 7B are cross-sectional views of the end plate of FIG. 6, wherein FIG. 7A is a cross-sectional view taken along line FF, FIG. 7B is a cross-sectional view taken along line GG, and FIG.

8 is a partially enlarged cross-sectional view of the rotor with permanent magnet according to the present invention, taken along the line AA in FIG. 1;

FIG. 9 is a partially enlarged cross-sectional view taken along the line BB of FIG. 1 showing a flow of cooling air of the rotor with a permanent magnet of the present invention.

10 is a partially enlarged cross-sectional view taken along the line CC of FIG. 1 similar to FIG. 9;

FIG. 11 is a partially enlarged cross-sectional view taken along the line DD of FIG. 1 similar to FIG. 9;

12 is a diagram showing a flow of cooling air of the rotor with a permanent magnet of the present invention, and FIG. 12 (a) is an enlarged view as viewed from an arrow E in FIG. 9;
FIG. 12B is an enlarged cross-sectional view taken along the line II of FIG.
FIG. 12C is an enlarged cross-sectional view taken along the line JJ of FIG.

FIG. 13 is a partial cross-sectional side view of a generator incorporating the rotor with a permanent magnet of the present invention.

FIG. 14 is a front view of the rotor with a permanent magnet of the present invention provided with an outer casing cover.

FIG. 15 is a partially enlarged plan view in which a non-magnetic material is embedded at both ends of a permanent magnet of the field iron core piece of the present invention.

FIG. 16 is an outer side view in which a baffle plate is provided on an end plate used in the rotor with a permanent magnet of the present invention.

FIG. 17 is an inner side view of FIG. 16;

FIG. 18 is an explanatory diagram showing the flow of air in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Field iron core piece 2 ... Permanent magnet 3 ... Through-hole 3a ... End 4 ... End plate 5 ... Wing plate 6 ... Concave groove 6a ... Peripheral protrusion 7 ... Concave 7a ... Peripheral protrusion 8 ... Partition wall 9 ... Bolt 10… Bolt hole 11… Outer housing cover 12… Intake hole 13… Exhaust hole 14… Crimping portion 15… Guide groove 16… Mark groove 17… Armature winding 18… Non-magnetic material 19… Baffle plate 20… Vent hole 21 … Gap 22… Flange

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI H02K 9/08 H02K 9/08 B

Claims (4)

[Claims] 1. A plurality of field iron cores formed by laminating field iron core pieces.
A plurality of permanent magnets are embedded, and a plurality of blades are provided on the outer surface of an end plate that is disposed on both side surfaces of the field core and fixes the field core. In the rotor with a permanent magnet for generating a flow of cooling air, a gap is provided between an inner surface of the end plate and an outer surface of the field core to form a cooling air flow path, and the permanent magnet of the field iron is formed. At both ends, an air passage in the axial direction is provided in contact with the surface of the permanent magnet, and cooling air is sucked in from one end plate side and discharged from the other end plate side through the air passage. A cooling structure for a rotor with a permanent magnet, wherein suction ports and discharge ports are provided in each end plate to form a cooling passage in the rotor. 2. A groove provided on the inner surface of the outer peripheral edge of both end plates of the field core with a suction port having an outer peripheral surface closed and an axial center opened, and an axially closed outer periphery closed on the axial side. The recesses having discharge ports each having an open surface are alternately arranged at equal intervals, and the recesses of the other end plate are arranged opposite to the positions of the recessed grooves of one end plate. A magnetic core is sandwiched between both end plates, and ventilation paths formed at both ends of a permanent magnet embedded in a long hole formed in the field iron core piece face the recesses and grooves of the end plate. The fan around the concave groove and the concave peripheral protrusion formed radially from the outer wing pieces and the shaft center of the both end plates with the rotation of the rotor, and fixed at both end plates from both side surfaces of the iron core. By the effect, cooling air is discharged to the outer peripheral side from a gap formed between the inner side surface of the end plate and the outer side surface of the field core, and Inhaled from the inlet,
The field core and the permanent magnet are cooled by passing through ventilation paths formed at both ends of the permanent magnet and being discharged from a discharge port of an end plate recess opposite to the concave groove. Item 2. A cooling structure for a rotor with a permanent magnet according to item 1. 3. A plurality of partition walls are provided between a concave groove provided inside the end plate and a concave portion or between inlets of the end plate, and the height of the partition wall is set to the concave groove or the concave portion. When the end plate is clamped from both sides of the laminated field core, a gap is formed between the end plate and the outer surface of the field core that contacts the end plate. The cooling structure for a rotor with a permanent magnet according to claim 2, wherein cooling air is discharged from the gap as the rotor rotates. 4. A plurality of permanent magnets are buried in a field core formed by laminating field core pieces, and are disposed on both side surfaces of the field core, and an outer surface of an end plate for fixing the field core. A rotor having a permanent magnet that causes a cooling air flow to the armature winding on the outside by the wings, wherein the plurality of wings protrude from the outer surface of the end plate at equal intervals. A baffle that protrudes in the rotation direction on one end plate and in the anti-rotation direction on the other end plate is disposed on the outer peripheral edge of the end plate, and a vent hole is formed in the axial center side near the baffle plate. At the same time, the positions of the ventilation holes of the both end plates are made to correspond to the ventilation openings at both ends where the permanent magnets of the field iron core formed by laminating the field iron core pieces are embedded, and with the rotation of the rotor, The cooling air sucked in from the ventilation hole on the shaft center side by the baffle plate of the end plate protruding in the rotation direction Through the air passage of the ends of the stones, the cooling structure of a rotor with permanent magnets, characterized in that cooling the opposite flow magnetic iron-core and the permanent magnet field to form a cooling air discharges from the vent.