JP2015057012A - Dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dynamo-electric machine in which iron loss can be reduced by lowering the magnetic flux density of a stator core facing a permanent magnet in the radial direction, while avoiding the shortening of insulation distance between the stator core and a stator winding.SOLUTION: A dynamo-electric machine 1 includes a rotor core 21 formed by laminating a plurality of magnetic steel sheets 22, and having a plurality of permanent magnets 27 embedded while spaced apart in the circumferential direction, a stator core 31 formed annularly by laminating a plurality of magnetic steel sheets 32, and having a plurality of teeth 35 projecting radially inward, and a stator winding 36 wound around the stator core 31. The length of the permanent magnet 27 in the rotation axis direction is set shorter than those of the rotor core 21 and stator core 31. A portion in the circumferential direction of the projection tip of the teeth 35 has the length in the rotation axis direction that is set equal to that of the permanent magnet 27.

Description

  The present invention relates to a rotating electrical machine that is mounted on a vehicle or the like and used as an electric motor or a generator.

  Conventionally, as a rotating electrical machine mounted and used in a vehicle, a rotor core having a plurality of magnets embedded at a distance in the circumferential direction, and arranged in a circumferential direction arranged opposite to the rotor core in the radial direction It is generally known to include a stator core having a plurality of slots and a stator winding housed in the slots and wound around the stator core. As the rotor core and the stator core, those formed by a plurality of electromagnetic steel plates laminated in the direction of the rotation axis are usually employed in order to reduce iron loss.

  And in patent document 1, the rotor core which has several magnet insertion holes which consist of several electromagnetic steel plates laminated | stacked on the rotating shaft direction and was formed in the circumferential direction at intervals, and each magnet insertion of a rotor core A rotor (rotor) of a motor (rotary electric machine) including a plurality of permanent magnets housed in holes is disclosed. In this rotor, the permanent magnet accommodated in the magnet insertion hole is fixed to the wall surface of the magnet insertion hole with a resin material, and the openings at both ends in the rotation axis direction of the magnet insertion hole are closed with the resin material. Therefore, the permanent magnet of the rotor is configured such that the length in the rotation axis direction is shorter than the lamination thickness of the rotor core (length in the rotation axis direction) so as not to protrude from the magnet insertion hole.

JP 2011-254677 A

  By the way, when the length of the permanent magnet in the rotation axis direction is made shorter than the laminated thickness of the rotor core as in the rotor disclosed in Patent Document 1, the magnitude relationship with the laminated thickness of the stator core is as follows. There are three ways. In the first case, as shown in FIG. 21, (the length of the permanent magnet 927 in the rotation axis direction) <(stacking thickness of the rotor core 921) <(stacking thickness of the stator core 931). In this case, the magnetic steel sheet on which the rotor core 921 is laminated opens in the direction of the rotation axis due to the magnetic flux of the stator core 931, which causes a problem of a decrease in strength of the rotor core 921.

  In the second case, as shown in FIG. 22, (stacking thickness of the stator core 931) ≦ (length in the rotation axis direction of the permanent magnet 927) <(stacking thickness of the rotor core 921). In this case, the magnetic steel sheet on which the stator core 931 is laminated is opened in the direction of the rotation axis due to the magnetic flux of the permanent magnet 927, and the insulation distance from the stator winding 936 is shortened. There is.

  In the third case, as shown in FIG. 23, (the length in the rotation axis direction of the permanent magnet 927) <(stacking thickness of the stator core 931) ≦ (stacking thickness of the rotor core 921). In this case, there is a problem that a magnetic flux density distribution is generated in the direction of the rotation axis of the stator core 931, and iron loss is increased in a high magnetic flux density portion.

  The present invention has been made in view of the above circumstances, and avoids the shortening of the insulation distance between the stator core and the stator winding while the stator core facing the permanent magnet in the radial direction. An object of the present invention is to provide a rotating electrical machine that can reduce iron loss by reducing magnetic flux density.

  The present invention made in order to solve the above-mentioned problems is made up of a plurality of permanent magnets (27, 127, 27) formed by a plurality of electromagnetic steel plates (22) stacked in the direction of the rotation axis and embedded at a distance in the circumferential direction. 227, 327, 427, 527) and a plurality of electromagnetic steel plates (32, 132, 232, 332) stacked in the direction of the rotation axis and arranged in the circumferential direction. A stator core (31, 131, 231 and 331) which has a plurality of slots (33) and is arranged radially opposite to the outer side of the rotor core, and is wound around the stator core A stator winding (36), wherein the length of the permanent magnet in the rotational axis direction is shorter than the length of the rotor core and the stator core in the rotational axis direction. Protrudes radially inward A plurality of teeth (35) that divide the slot on both sides in the circumferential direction are provided, and a part of the protruding tip of the teeth in the circumferential direction has a rotational axis length equal to the rotational axis length of the permanent magnet. It is characterized by being set to the same.

  In the present invention, a part in the circumferential direction of the protruding tip of the tooth may not necessarily be exactly the same with respect to the fact that the length in the rotation axis direction is set to be the same as the length in the rotation axis direction of the permanent magnet. Good. For example, an inevitable dimensional tolerance of members such as a rotor core and a stator core, and a backlash set on a bearing that rotatably supports a rotating shaft of the rotor are acceptable ranges.

  According to the present invention, in the rotating electrical machine in which the length of the permanent magnet in the rotational axis direction is shorter than the length of the rotor core and the stator core in the rotational axis direction, the stator core protrudes inward in the radial direction. The teeth have a plurality of teeth that divide the slots on the side surfaces on both sides in the direction, and a portion in the circumferential direction of the protruding tip of the teeth is set to have the same length in the rotation axis direction as that of the permanent magnet. Therefore, the magnetic flux density distribution in the rotation axis direction of the stator core is equalized by drawing the magnetic flux of the permanent magnet into the portion of the stator core that does not face the permanent magnet. Thereby, since an average magnetic flux density falls, an iron loss can be reduced.

  Further, according to the present invention, since the length of the permanent magnet in the rotation axis direction is shorter than the length of the rotor core and the stator core in the rotation axis direction, the stator core is laminated by the magnetic flux of the permanent magnet. It is possible to prevent the electromagnetic steel sheet from opening in the direction of the rotation axis. Therefore, shortening of the insulation distance between the stator core and the stator winding can be avoided.

  In addition, the code | symbol in the parenthesis after each member and site | part described in this column and the claim shows the correspondence with the specific member and site | part described in embodiment mentioned later.

FIG. 3 is a cross-sectional view in the rotation axis direction of the rotating electrical machine according to the first embodiment. FIG. 3 is a cross-sectional view in the rotation axis direction showing the configuration of the rotor core, the permanent magnet, and the stator core of the rotating electrical machine according to the first embodiment. 1 is an overall perspective view of a stator according to Embodiment 1. FIG. It is a partial top view which shows the teeth of the 1st-3rd electromagnetic steel plate which comprises the stator core which concerns on Embodiment 1, (a) shows the teeth of a 1st electromagnetic steel plate, (b) is the 3rd electromagnetic steel plate. (C) shows the teeth of the second electromagnetic steel sheet. It is a partial side view which shows the teeth of the 1st-3rd electromagnetic steel plate which comprises the stator core which concerns on Embodiment 1, Comprising: (a) shows the teeth of a 1st electromagnetic steel plate, (b) is the 3rd electromagnetic steel plate. (C) shows the teeth of the second electromagnetic steel sheet. FIG. 6 is an explanatory diagram showing a state where conductor segments are inserted into slots of the stator core in the first embodiment. FIG. 3 is a connection diagram of a stator winding according to the first embodiment. FIG. 3 is an explanatory diagram showing a magnetic flux density distribution in a rotation axis direction in “B section” of teeth in the first embodiment. In Embodiment 1, it is explanatory drawing which shows the magnetic flux density distribution of the rotating shaft direction in "A part" and "A part + B part" of teeth. It is a rotating shaft direction sectional view which shows the structure of the rotor core of the rotary electric machine which concerns on Embodiment 2, a permanent magnet, and a stator core. It is a rotating shaft direction sectional view showing composition of a rotor core of a rotary electric machine concerning a modification 1, a permanent magnet, and a stator core. It is a rotating shaft direction sectional drawing which shows the structure of the rotor core of the rotary electric machine which concerns on Embodiment 3, a permanent magnet, and a stator core. It is a rotating shaft direction sectional drawing which shows the structure of the rotor core of the rotary electric machine which concerns on the modification 2, a permanent magnet, and a stator core. It is a rotating shaft direction sectional drawing which shows the structure of the rotor core of the rotary electric machine which concerns on Embodiment 4, a permanent magnet, and a stator core. FIG. 10 is a cross-sectional view in the direction of the rotation axis showing the configuration of a rotor core, a permanent magnet, and a stator core of a rotating electrical machine according to a fifth embodiment. It is a rotating shaft direction sectional drawing which shows the structure of the rotor core of the rotary electric machine which concerns on Embodiment 6, a permanent magnet, and a stator core. It is a fragmentary top view which shows the teeth of the 1st and 3rd electromagnetic steel plate which comprises the stator core which concerns on the modification 3, Comprising: (a) shows the teeth of a 1st electromagnetic steel plate, (b) is the 3rd electromagnetic steel plate. Teeth are shown. It is a partial top view which shows the teeth of the 1st and 3rd electromagnetic steel plate which comprises the stator core which concerns on the modification 4, Comprising: (a) shows the teeth of a 1st electromagnetic steel plate, (b) is the 3rd electromagnetic steel plate. Teeth are shown. It is the fragmentary top view which shows the teeth of the 1st and 3rd electromagnetic steel plate which comprises the stator core which concerns on the modification 5, Comprising: (a) shows the teeth of a 1st electromagnetic steel plate, (b) is the 3rd electromagnetic steel plate. Teeth are shown. It is a fragmentary top view which shows the teeth of the 1st and 3rd electromagnetic steel plate which comprises the stator core which concerns on the modification 6, Comprising: (a) shows the teeth of a 1st electromagnetic steel plate, (b) is the 3rd electromagnetic steel plate. Teeth are shown. FIG. 4 is an explanatory diagram showing a configuration having a relationship of (length in the rotation axis direction of a permanent magnet) <(layer thickness of a rotor core) <(layer thickness of a stator core) in a rotating electric machine. FIG. 6 is an explanatory diagram showing a configuration having a relationship of (stacking thickness of stator core) ≦ (length in the rotation axis direction of permanent magnet) <(stacking thickness of rotor core) in the rotating electrical machine. FIG. 5 is an explanatory diagram showing a configuration having a relationship of (length in the rotation axis direction of a permanent magnet) <(stacking thickness of stator core) ≦ (stacking thickness of rotor core) in a rotating electrical machine.

  Hereinafter, embodiments of a rotating electrical machine according to the present invention will be specifically described with reference to the drawings.

Embodiment 1
The rotating electrical machine 1 according to the present embodiment is used as a vehicle motor. As shown in FIG. 1, the rotating electrical machine 1 includes a housing 10 in which a pair of bottomed cylindrical housing members 10 a and 10 b are joined at openings, and the housing 10 is rotatable via bearings 11 and 12. A rotating shaft 13 supported on the rotor, a rotor 20 fitted and fixed to the outer periphery of the rotating shaft 13, and a stator fixed to the inner surface of the housing 10 and disposed radially opposite the rotor 20 30.

  As shown in FIG. 2, the rotor 20 is embedded in a rotor core 21 formed by laminating a plurality of electromagnetic steel plates 22 in the direction of the rotation axis and an outer peripheral portion of the rotor core 21 at a distance in the circumferential direction. And a plurality of permanent magnets 27. Eight magnet housing holes 23 penetrating in the rotation axis direction are formed in the outer peripheral portion of the rotor core 21 at a distance in the circumferential direction. Each magnet accommodation hole 23 accommodates one permanent magnet 27 formed in a prismatic shape. These eight permanent magnets 27 form a plurality of magnetic poles (in this embodiment, eight poles (N pole: 4, S pole: 4)) having different polarities in the circumferential direction.

  The permanent magnet 27 accommodated in each magnet accommodation hole 23 is fixed to the wall surface of the magnet accommodation hole 23 by a resin material 28 filled in the magnet accommodation hole 23. As these permanent magnets 27, magnets whose length in the rotation axis direction is shorter than the laminated thickness of the rotor core 21 (length in the rotation axis direction) are adopted. In the case of the present embodiment, the permanent magnet 27 is located at the central portion in the rotation axis direction of the magnet accommodation hole 23, and the openings at both ends in the rotation axis direction of the magnet accommodation hole 23 are closed by the resin material 28.

  As shown in FIG. 3, the stator 30 includes an annular stator core 31 having a plurality of slots 33 arranged in the circumferential direction, and a three-phase coil housed in the slot 33 and wound around the stator core 31. (U-phase, V-phase, W-phase) stator winding 36.

  The stator core 31 is an integral type formed by laminating a plurality of annular electromagnetic steel plates 32 in the rotation axis direction. The stator core 31 includes an annular back core 34 and a plurality of teeth 35 protruding radially inward from the back core 34 and defining slots 33 on both sides in the circumferential direction. In the present embodiment, 48 slots 33 are arranged at equal intervals in the circumferential direction so as to accommodate the three-phase stator winding 36.

  As shown in FIG. 2, the stator core 31 has a lamination thickness (length in the rotation axis direction) shorter than the rotation axis direction length of the rotor core 21 and is longer than the rotation axis direction length of the permanent magnet 27. Longer ones are used. A part of the protruding tip of each tooth 35 in the circumferential direction (in this embodiment, both ends in the circumferential direction) is set to have the same rotational axis length as the rotational axis length of the permanent magnet 27. Hereinafter, a portion where the rotation axis direction length of the protruding tip portion of each tooth 35 is set to be the same as the length of the permanent magnet 27 in the rotation axis direction is referred to as “A portion”, and “A” of the protruding tip portion of each tooth 35 is referred to as “A portion”. Parts other than “part” are referred to as “part B”.

  The plurality of electromagnetic steel plates 32 constituting the stator core 31 are composed of a plurality of first electromagnetic steel plates 321 arranged on one side in the rotation axis direction (upper side in FIG. 2) and the other side in the rotation axis direction (lower side in FIG. 2). And a plurality of third electromagnetic steel plates 323 arranged in the central portion in the rotation axis direction are combined and laminated.

  As shown in FIGS. 4A and 5A, the first electromagnetic steel plate 321 is a “first portion” 321 a that is tilted to the other side in the rotational axis direction (the lower side in FIG. 2) in “A portion”. Have Further, as shown in FIG. 4C and FIG. 5C, the second electromagnetic steel plate 322 is secondly tilted to the one side (upper side in FIG. 2) in the rotation axis direction in “A part”. Part 322a.

  The first fall part 321 a and the second fall part 322 a are provided at both ends in the circumferential direction of the protruding tip part of the tooth 35. Note that the tips of the first fallen part 321a and the second fallen part 322a are formed so as to coincide with the protruding tips of the teeth 35 after they are fallen down. In addition, the circumferential widths of the first falling portion 321a and the second falling portion 322a are set to about 1/4 of the circumferential width of the entire protruding tip portion of the tooth 35. Therefore, the circumferential width of a portion other than the first falling portion 321a and the second falling portion 322a of the protruding tip portion of the tooth 35 is about ½ of the circumferential width of the entire protruding tip portion of the tooth 35.

  Further, as shown in FIG. 4B and FIG. 5B, the third electromagnetic steel sheet 323 has the portions corresponding to the first fall part 321a and the second fall part 322a removed in “A part”. A removal unit 323a is included. The circumferential width of the removal part 323a is larger than the circumferential widths of the first fall part 321a and the second fall part 322a, and the first fall part 321a, the second fall part 322a, and the third electromagnetic steel plate 323 are formed. It is made not to interfere.

  In this case, the first electromagnetic steel plate 321 and the second electromagnetic steel plate 322 are each laminated to a thickness of about ½ of the length of the permanent magnet 27 in the rotation axis direction. Moreover, the 1st fall part 321a of the 1st electromagnetic steel plate 321 and the 2nd fall part 322a of the 2nd electromagnetic steel plate 322 which were arrange | positioned adjacently in the rotation-axis direction center part have the front-end | tip parts of a radial inside side. It is in contact. In the present embodiment, the removal part 323a of the third electromagnetic steel sheet 323 is provided, so that the first to third parts 321a and 322a do not interfere with the third electromagnetic steel sheet 323 without first to third interference. The electromagnetic steel plates 321 to 323 can be stacked, and thereby the “A part” can be set.

  Moreover, the 1st fall part 321a, the 2nd fall part 322a, and the removal part 323a are each provided in the circumferential direction both ends of the teeth 35 of the 1st-3rd electromagnetic steel plates 321-323. And the protrusion front-end | tip part of the teeth 35 is formed in the shape symmetrical with respect to the straight line L1 which passes along the circumferential direction center of the teeth 35, and extends in the radial direction of the stator core 31.

  The stator winding 36 wound around the stator core 31 is configured by joining open ends of a plurality of U-shaped conductor segments 50 to each other by welding. The conductor segment 50 is formed in a U-shape with a rectangular wire composed of a conductor having a rectangular cross section and an insulating film covering the outer peripheral surface of the conductor. As shown in FIG. 6, the conductor segment 50 includes a pair of straight portions 51 and 51 that are parallel to each other, and a turn portion 52 that connects one ends of the pair of straight portions 51 and 51 to each other. A top step 53 extending along the end surface 31 a of the stator core 31 is provided at the center of the turn portion 52, and a predetermined amount with respect to the end surface 31 a of the stator core 31 is provided on both sides of the top step 53. An inclined portion inclined at an angle of is provided. Reference numeral 24 denotes an insulator that electrically insulates between the stator core 31 and the stator winding 36.

  FIG. 6 shows a pair of conductor segments 50A and 50B that are inserted and arranged in two adjacent slots 33A and 33B of the same phase. In this case, in the two conductor segments 50A and 50B, the pair of straight portions 51 and 51 are not inserted into the same slot 33 but into the adjacent two slots 33A and 33B separately from one end in the axial direction. The That is, in the two conductor segments 50A and 50B on the right side of FIG. 6, one conductor segment 50A has one straight portion 51 inserted in the outermost layer (eighth layer) of one slot 33A and the other straight line segment 50A. The portion 51 is inserted into the seventh layer of another slot (not shown) separated by one magnetic pole pitch (NS magnetic pole pitch) in the counterclockwise direction of the stator core 30.

  In the other conductor segment 50B, one straight portion 51 is inserted into the outermost layer (eighth layer) of the slot 33B adjacent to the slot 33A, and the other straight portion 51 extends in the counterclockwise direction of the stator core 30. It is inserted into the seventh layer of another slot (not shown) separated by one magnetic pole pitch (NS magnetic pole pitch). That is, the two conductor segments 50A and 50B are arranged in a state shifted by one slot pitch in the circumferential direction. In this way, the straight portions 51 of the predetermined number of conductor segments 50 are inserted and arranged in all the slots 33. In the case of this embodiment, a total of eight straight portions 51 are stacked and arranged in one row in the radial direction in each slot 33.

  The open ends of the pair of linear portions 51, 51 extending from the slot 33 toward the other axial end are opposite to each other in the circumferential direction so as to be obliquely inclined with respect to the end surface 31a of the stator core 31 at a predetermined angle. Twisted to the side, a twisted portion having a length corresponding to about a half magnetic pole pitch is formed. Then, on the other end side in the axial direction of the stator core 31, the tips of the predetermined twisted portions of the conductor segment 50 are joined together by welding and electrically connected in a predetermined pattern. As a result, when the predetermined conductor segments 50 are connected in series, two phase windings (U 1, U 2, V 1) wound spirally in the circumferential direction along the slots 33 of the stator core 31. , V2, W1, W2) are formed.

  For each phase of the stator winding 36, a winding (coil) that makes eight turns around the stator core 31 is formed by the basic U-shaped conductor segment 50. However, for each phase of the stator winding 36, a segment having an output lead wire and a neutral lead wire integrally, and a segment having a turn portion connecting the first and second rounds are basically The conductor segment 50 is composed of a deformed segment (not shown). Using these irregularly shaped segments, as shown in FIG. 7, the winding ends of the respective phases of the stator winding 36 are connected by star connection.

  In the rotating electrical machine 1 of the present embodiment configured as described above, when the stator winding 36 is energized, the rotor 20 rotates in a predetermined direction and starts operation. FIG. 8 shows the magnetic flux density distribution in the direction of the rotation axis in the “B part” of the tooth 35 when the rotating electrical machine 1 is operated. In this case, the magnetic flux does not flow at both ends of the teeth 35 in the rotation axis direction that are not opposed to the permanent magnet 27 in the radial direction, and is constant at the rotation axis direction central portion that is opposed to the permanent magnet 27 of the teeth 35 in the radial direction. A magnetic flux of density is flowing. That is, a magnetic flux having a constant density flows in the range of the teeth 35 in the direction of the rotational axis corresponding to the length of the permanent magnet 27 in the direction of the rotational axis.

  9 shows the magnetic flux density distribution in the direction of the rotation axis in the “A part” of the tooth 35 when the rotating electrical machine 1 is operated. In this case, the magnetic flux does not flow through the third electromagnetic steel plate 323 having the removal portion 323a disposed at the central portion in the rotation axis direction of the tooth 35, and the first and second falling portions 321a facing the permanent magnet 27 in the radial direction, By drawing the magnetic flux of the permanent magnet 27 through 322a, the magnetic flux having a constant density flows through the entire first and second electromagnetic steel sheets 321 and 322.

  The right side of FIG. 9 shows the magnetic flux density distribution in the direction of the rotation axis in which the “A part” and the “B part” of the tooth 35 are combined (“A part + B part”). In the case of the present embodiment, by providing the “A part”, the magnetic flux density is reduced from the maximum to about half in the range where the third electromagnetic steel sheet 323 at the center part in the rotation axis direction of the tooth 35 is disposed. It will be lowered. Further, at both ends of the teeth 35 in the rotation axis direction, the magnetic flux density is pushed up to about half of the maximum. As a result, the magnetic flux density distribution in the rotation axis direction of the stator core 31 is equalized, so that the average magnetic flux density is reduced and iron loss can be reduced.

  Therefore, according to the rotating electrical machine 1 of the present embodiment, a part of the protruding tip of the tooth 35 in the circumferential direction (both ends in the circumferential direction) has the same rotational axis length as the rotational axis length of the permanent magnet 27. Since it is set, the magnetic flux density distribution in the rotation axis direction of the stator core 31 is equalized by drawing the magnetic flux of the permanent magnet 27 into a portion of the stator core 31 that does not face the permanent magnet 27. Thereby, since an average magnetic flux density falls, an iron loss can be reduced.

  In the present embodiment, the length of the permanent magnet 27 in the rotation axis direction is shorter than the length of the rotor core 21 and the stator core 31 in the rotation axis direction. It is possible to prevent the 31 electromagnetic steel plates 32 stacked from being opened in the rotation axis direction. Therefore, shortening of the insulation distance between the stator core 31 and the stator winding 36 can be avoided.

  In the present embodiment, the length of the stator core 31 in the rotation axis direction is shorter than the length of the rotor core 21 in the rotation axis direction. Therefore, when electromagnetic force is applied to the rotor core 21 in the direction of the rotation axis by the stator winding 36, it is possible to prevent the electromagnetic steel plate 22 on which the rotor core 21 is laminated from opening in the direction of the rotation axis. Thereby, the strength reduction of the rotor core 21 can be avoided.

  In addition, the stator core 31 of the present embodiment includes a plurality of first electromagnetic steel plates 321 having a first falling portion 321a, a plurality of second electromagnetic steel plates 322 having a second falling portion 322a, and a plurality having a removal portion 323a. The third electrical steel sheet 323 is laminated in a predetermined state. Therefore, a desired “A part” can be easily formed on the teeth 35 of the stator core 31.

  Further, in the present embodiment, the protruding tip portion of the tooth 35 is formed in a shape that is symmetric with respect to a straight line L <b> 1 that passes through the center in the circumferential direction of the tooth 35 and extends in the radial direction of the stator core 31. Therefore, the same performance such as torque and ripple can be easily obtained in both the forward and reverse rotation directions of the rotor 20.

[Embodiment 2]
The basic configuration of the rotating electrical machine according to the second embodiment is the same as that of the first embodiment, but the arrangement position of the permanent magnet 127 and the configuration of the electromagnetic steel sheet 132 that constitutes the stator core 131 are the same as those of the first embodiment. Different from the one. Therefore, the detailed description about the member and structure which are common in Embodiment 1 is abbreviate | omitted, and demonstrates a different point and an important point with reference to FIG. 10 below. In addition, the same code | symbol is used about the member and structure which are common in Embodiment 1. FIG.

  The permanent magnet 127 according to the second embodiment is the same as the permanent magnet 27 according to the first embodiment. However, the permanent magnet 127 is closer to the other side (the lower side in FIG. 10) of the rotor core 21 in the rotation axis direction. This is different from the first embodiment in that it is arranged at a different position. In this case, the permanent magnet 127 is fixed to the wall surface of the magnet accommodation hole 23 by the resin material 28 filled in the magnet accommodation hole 23. Further, the openings at both ends of the magnet housing hole 23 in the rotation axis direction are closed by the resin material 28.

  The electromagnetic steel plate 132 constituting the stator core 131 of the second embodiment includes a plurality of first electromagnetic steel plates 321 arranged on one side (the upper side in FIG. 10) in the rotation axis direction and the other end portion (see FIG. And a plurality of third electromagnetic steel plates 323 arranged at the lower end portion of (10). The first and third electromagnetic steel plates 321 and 323 of the second embodiment are the same as those used in the first embodiment. Thereby, also in the case of Embodiment 2, the circumferential direction part (circumferential direction both ends) of the protrusion front-end | tip part of each teeth 35 sets the rotation axis direction length to be the same as the rotation axis direction length of the permanent magnet 127. Has been.

  According to the rotating electrical machine of the second embodiment configured as described above, a part of the protruding tip portion of the tooth 35 in the circumferential direction (both ends in the circumferential direction) has a rotational axis direction length of the permanent magnet 127. Since it is set to be the same as the length, the magnetic flux density distribution in the direction of the rotation axis of the stator core 31 is equalized. Thereby, since an average magnetic flux density falls, an iron loss can be reduced and there exists an effect | action and effect similar to Embodiment 1.

  In particular, in the case of the second embodiment, the permanent magnet 127 is disposed at a position close to the other side in the rotation axis direction of the magnet accommodation hole 23, and thus the permanent magnet 127 is fixed to the magnet accommodation hole 23 with the resin material 28. Work becomes easier.

[Modification 1]
In the second embodiment, the permanent magnet 127 is disposed at a position close to the other side (the lower side in FIG. 10) in the rotation axis direction of the magnet housing hole 23. However, as in Modification 1 shown in FIG. The permanent magnet 127 may be arranged at a position close to one side (upper side in FIG. 11) in the rotation axis direction of the magnet accommodation hole 23.

  In this case, the electromagnetic steel plate 132 constituting the stator core 131 includes a plurality of second electromagnetic steel plates 322 arranged on the other side in the rotation axis direction (lower side in FIG. 11) and one end portion in the rotation axis direction (FIG. 11). And a plurality of third electromagnetic steel sheets 323 arranged at the upper side end portion). Note that the second and third electromagnetic steel plates 322 and 323 of the first modification are the same as those used in the first embodiment. Thereby, also in the case of the modification 1, the circumferential direction part (circumferential direction both ends) of the protrusion front-end | tip part of each tooth | gear 35 sets the rotation axis direction length to be the same as the rotation axis direction length of the permanent magnet 127. Thus, the same operations and effects as those of the second embodiment are achieved.

[Embodiment 3]
The rotating electrical machine according to the third embodiment has the same basic configuration as that of the first embodiment, but differs from that of the first embodiment in that the permanent magnet 227 is divided into two. That is, as shown in FIG. 12, the permanent magnet 227 of the third embodiment is obtained by simply dividing the permanent magnet 27 of the first embodiment into two in the rotation axis direction. End surfaces facing each other in the direction of the rotation axis are arranged in contact with each other or close to each other (resin material 28 exists between two permanent magnets 227). In addition, since structures other than the permanent magnet 227 of the rotating electrical machine according to the third embodiment are the same as those of the first embodiment, common members are denoted by the same reference numerals, and detailed descriptions thereof are omitted.

  Therefore, also in the case of the rotating electrical machine of the third embodiment, a part of the protruding tip of the tooth 35 in the circumferential direction (both ends in the circumferential direction) has the same rotational axis direction length as the rotational axis direction length of the permanent magnet 227. Since it is set, the same operations and effects as those of the first embodiment can be achieved, such as equalizing the magnetic flux density distribution in the rotation axis direction of the stator core 31 and reducing iron loss.

  In particular, in the case of the third embodiment, the permanent magnet 227 is divided into two pieces and is made smaller. Therefore, the permanent magnet 227 can be easily handled and work efficiency can be improved.

  In the third embodiment, only the permanent magnet 227 embedded in the magnet accommodation hole 23 of the rotor core 21 is divided into two pieces in the rotation axis direction. However, the entire rotor core 21 including the permanent magnet 227 is divided. The rotor core 21 of the third embodiment can be formed by forming the two divided cores in the direction of the rotation axis and then stacking and fixing the two divided cores in the direction of the rotation axis.

  In this case, since the two split cores are symmetrical with respect to the plane perpendicular to the axis passing through the center of the rotor core 21 in the rotation axis direction, one of the two split cores formed in the same shape is inverted. Thus, the rotor core 21 can be formed. In this way, the rotor core 21 can be formed more easily.

[Modification 2]
The permanent magnet 227 of the third embodiment is obtained by dividing the permanent magnet 27 of the first embodiment into two pieces in the rotation axis direction. However, as in the second modification shown in FIG. 27 may be divided into three pieces in the rotation axis direction. Although not shown, the permanent magnet 27 of the first embodiment may be divided into four or more in the rotation axis direction.

[Embodiment 4]
The rotating electrical machine according to the fourth embodiment has the same basic configuration as that of the second embodiment, but differs from that of the second embodiment in that the permanent magnet 327 is divided into two. That is, as shown in FIG. 14, the permanent magnet 327 of the fourth embodiment is obtained by simply dividing the permanent magnet 127 of the second embodiment into two in the direction of the rotation axis. It arrange | positions in the position which approached the other side edge part (lower side of FIG. 14). In this case, the two permanent magnets 327 are arranged in a state in which end surfaces facing each other in the rotation axis direction are in contact with each other or close to each other (the resin material 28 exists between the two permanent magnets 327). The total length in the rotation axis direction of the two permanent magnets 327 in the fourth embodiment is shorter than the length in the rotation axis direction of the permanent magnet 127 in the second embodiment.

  Moreover, the electromagnetic steel plate 232 which comprises the stator core 231 of Embodiment 4 has the some 1st electromagnetic steel plate 321 arrange | positioned in the rotation-axis direction center part (up-down direction center part of FIG. 14), and the rotation-axis direction both ends ( A plurality of third electromagnetic steel plates 323 respectively arranged at both ends in the vertical direction in FIG. 14 are combined and laminated. The first and third electromagnetic steel plates 321 and 323 of the fourth embodiment are the same as those used in the first embodiment. Thereby, also in the case of Embodiment 4, the circumferential direction part (circumferential direction both ends) of the protrusion front-end | tip part of each teeth 35 sets the rotation axis direction length to be the same as the rotation axis direction length of the permanent magnet 327. Has been.

  In addition, since the other structure of the rotary electric machine which concerns on Embodiment 4 is the same as Embodiment 2, the same code | symbol is attached | subjected to a common member and those detailed description is abbreviate | omitted. Also in the case of the rotating electrical machine of the fourth embodiment configured as described above, the same operations and effects as those of the second embodiment are achieved.

[Embodiment 5]
The rotating electrical machine according to the fifth embodiment has the same basic configuration as that of the third embodiment, but the arrangement position of the permanent magnet 427 divided into two parts and the first to third parts constituting the stator core 31. The combination of the electromagnetic steel sheets 321 to 323 is different from that of the third embodiment. Therefore, detailed descriptions of members and configurations common to the third embodiment are omitted, and different points and important points will be described below.

  In the third embodiment, the two permanent magnets 227 are arranged in contact with or close to the central portion of the magnet housing hole 23 in the rotation axis direction. However, in the fifth embodiment, as shown in FIG. Permanent magnets 427 are arranged in a state of being separated from both ends of the magnet housing hole 23 in the rotation axis direction. A resin material 28 is filled between the two permanent magnets 427.

  Further, the stator core 31 of the fifth embodiment includes a plurality of third electromagnetic steel plates 323, a plurality of second electromagnetic steel plates 322, which are sequentially stacked from one side of the rotation axis direction (the upper side in FIG. 15). A plurality of first electromagnetic steel plates 321 and a plurality of third electromagnetic steel plates 323 are configured. In this case, the first electromagnetic steel plate 321 and the second electromagnetic steel plate 322 are laminated to the same thickness as the length of the permanent magnet 427 in the rotation axis direction. Further, the third electromagnetic steel plates 323 arranged at both ends in the rotation axis direction are laminated to a thickness of about ½ of the length in the rotation axis direction of the resin material 28 filled between the two permanent magnets 427. ing.

  Also in the case of the rotating electric machine according to the fifth embodiment configured as described above, a part of the protruding tip portion of the tooth 35 in the circumferential direction is set to have the same rotational axis length as that of the permanent magnet 427. Therefore, the same operations and effects as those of the third embodiment are obtained.

  The rotor core 21 according to the fifth embodiment is formed by dividing the entire rotor core 21 including the permanent magnet 227 according to the third embodiment into two in the rotation axis direction, and then inverts both of the two divided cores. In this state, it can be formed by stacking and fixing in the direction of the rotation axis. In this way, the rotor core 21 can be formed more easily. The number of divided cores to be stacked may be three or more.

[Embodiment 6]
The rotating electrical machine according to the sixth embodiment has the same basic configuration as that of the fourth embodiment, but the arrangement position of the permanent magnet 527 divided into two is different from that of the fourth embodiment. That is, in the sixth embodiment, as shown in FIG. 16, the two permanent magnets 527 are arranged in a state of being separated from each other at a position close to the other side (the lower side in FIG. 16) of the magnet housing hole 23 in the rotation axis direction. Has been. In this case, the resin material 28 is filled between the two permanent magnets 527. The permanent magnet 527 on one side in the rotation axis direction is arranged so that the end surface on the other side in the rotation axis direction is located at the center of the magnet housing hole 23 in the rotation axis direction.

  In addition, in the electromagnetic steel plate 332 constituting the stator core 331 of Embodiment 6, a plurality of first electromagnetic steel plates 321 and a plurality of third electromagnetic steel plates 323 are alternately combined in order from one side in the rotation axis direction. Have been stacked. The first and third electromagnetic steel plates 321 and 323 of the sixth embodiment are the same as those used in the first embodiment. Accordingly, also in the case of the sixth embodiment, a part of the protruding tip of each tooth 35 in the circumferential direction (both ends in the circumferential direction) has the same rotational axis length as the rotational axis length of each permanent magnet 327. Is set.

  In addition, since the other structure of the rotary electric machine which concerns on Embodiment 6 is the same as Embodiment 4, the same code | symbol is attached | subjected to a common member and those detailed description is abbreviate | omitted. In the case of the rotating electrical machine of the sixth embodiment configured as described above, the same operations and effects as those of the fourth embodiment are obtained.

  The rotor core 21 according to the sixth embodiment is formed by dividing the entire rotor core 21 including the permanent magnet 527 into two in the rotation axis direction, and then stacking and fixing the two divided cores in the rotation axis direction. Can be formed. In this case, since the two split cores have the same shape, the rotor core 21 can be manufactured easily and at low cost. The number of divided cores to be stacked may be three or more.

Other Embodiment
The present invention is not limited to the above-described embodiments and modifications, and various modifications can be made without departing from the spirit of the present invention. Hereinafter, the electromagnetic steel plates 31 constituting the stator core 31 will be described in detail with reference to Modifications 3 to 6. In addition, in FIGS. 17-20 which concern on the modifications 3-6, the 1st electromagnetic steel plate and the 3rd electromagnetic steel plate are shown, About the 2nd electromagnetic steel plate, the 1st electromagnetic steel plate and the fall direction of a fall part are opposite. Since it differs only in the point which becomes a side, illustration and description are abbreviate | omitted. Moreover, the same code | symbol is used about the member and site | part which are common in Embodiment 1. FIG.

[Modification 3]
As for the 1st electromagnetic steel plate 321 of the modification 3, the 1st fall part 321a is provided in the circumferential direction center part of the protrusion front-end | tip part of the teeth 35, as shown to Fig.17 (a). That is, in the first embodiment, the first falling portion 321a is an outwardly inclined type provided at both ends in the circumferential direction of the protruding tip portion of the tooth 35, whereas the first falling portion 321a of Modification 3 is inclined inwardly. Of the type. In this case, the circumferential width of the first falling part 321a is set to be slightly less than ½ of the circumferential width of the entire protruding tip of the tooth 35. In addition, the circumferential width of the protruding tip portion of the tooth 35 on both sides in the circumferential direction of the first fallen portion 321a is set to about ¼ of the circumferential width of the entire protruding tip portion of the tooth 35.

  On the other hand, as shown in FIG. 17B, the third electromagnetic steel plate 323 of Modification 3 is a removal in which a portion corresponding to the first falling portion 321 a is removed at the circumferential center portion of the protruding tip portion of the tooth 35. Part 323a. The circumferential width of the removing portion 323a is set to about ½ of the circumferential width of the entire protruding tip of the tooth 35. The removing portion 323a is larger than the circumferential width of the first falling portion 321a so that the first falling portion 321a and the third electromagnetic steel plate 323 do not interfere with each other.

  In addition, the 1st electromagnetic steel plate 321 and the 3rd electromagnetic steel plate 323 of the modification 3 are the same as Embodiment 1, and the protrusion front-end | tip part of the teeth 35 passes along the circumferential direction center of the teeth 35, and is radial direction of the stator core 31. It is formed in a shape that is symmetric with respect to the extending straight line L1.

[Modification 4]
As shown in FIGS. 18A and 18B, Modification 4 is different from Embodiment 1 in the circumferential width of the first fall part 321 a of the first electromagnetic steel plate 321 and the removal part 323 a of the third electromagnetic steel plate 323. Is changed to be smaller. In the modified example 4, the circumferential width of the first falling portion 321a and the removing portion 323a is set to about 1/7 of the circumferential width of the entire protruding tip portion of the tooth 35. However, the circumferential width of the removal portion 323a is set larger than the circumferential width of the first falling portion 321a so that the first falling portion 321a and the third electromagnetic steel plate 323 do not interfere with each other.

  Further, the circumferential width of the protruding tip portion of the tooth 35 between the first falling portions 321a of the first electromagnetic steel sheet 321 is set to about ½ of the circumferential width of the entire protruding tip portion of the tooth 35.

  In addition, as for the 1st electromagnetic steel plate 321 and the 3rd electromagnetic steel plate 323 of the modification 4, the protrusion front-end | tip part of the teeth 35 passes the center of the circumferential direction of the teeth 35 in the radial direction of the stator core 31 similarly to Embodiment 1. It is formed in a shape that is symmetric with respect to the extending straight line L1.

[Modification 5]
As illustrated in FIGS. 19A and 19B, the fifth modification has a circumferential width of the first fall portion 321 a of the first electromagnetic steel plate 321 and the removal portion 323 a of the third electromagnetic steel plate 323 with respect to the first embodiment. Has been changed to be larger. In the modified example 5, the circumferential width of the first falling part 321a and the removing part 323a is set to about １ ／ of the circumferential width of the entire protruding tip of the tooth 35. However, the circumferential width of the removal portion 323a is set larger than the circumferential width of the first falling portion 321a so that the first falling portion 321a and the third electromagnetic steel plate 323 do not interfere with each other.

  Further, the circumferential width of the protruding tip portion of the tooth 35 between the first collapsed portions 321a of the first electromagnetic steel sheet 321 is set to be about 1/3 of the circumferential width of the entire protruding tip portion of the tooth 35. . However, the circumferential width of the protruding tip portion of the tooth 35 between the first falling portions 321a is slightly smaller than the circumferential width of the first falling portion 321a.

  In addition, as for the 1st electromagnetic steel plate 321 and the 3rd electromagnetic steel plate 323 of the modification 5, the protrusion front-end | tip part of the teeth 35 passes along the circumferential direction center of the teeth 35 in the radial direction of the stator core 31 similarly to Embodiment 1. It is formed in a shape that is symmetric with respect to the extending straight line L1.

[Modification 6]
As shown in FIG. 20A, the first electromagnetic steel plate 321 of Modification 6 has a first falling part 321 a provided on one side in the circumferential direction of the protruding tip of the tooth 35 (left side in FIG. 20). The circumferential width of the first fallen portion 321a is set to be a little less than ½ of the circumferential width of the entire protruding tip of the tooth 35. Further, the circumferential width of the protruding tip portion of the tooth 35 on the other circumferential side of the first fallen portion 321a is also set to about ½ of the circumferential width of the entire protruding tip portion of the tooth 35.

  On the other hand, as shown in FIG. 20B, the third electromagnetic steel plate 323 of Modification 6 corresponds to the first falling portion 321a on one side in the circumferential direction (left side in FIG. 20) of the protruding tip portion of the tooth 35. It has the removal part 323a from which the site | part was removed. The circumferential width of the removing portion 323a is set to about ½ of the circumferential width of the entire protruding tip of the tooth 35. The removing portion 323a is larger than the circumferential width of the first falling portion 321a so that the first falling portion 321a and the third electromagnetic steel plate 323 do not interfere with each other.

  Note that the first electromagnetic steel plate 321 and the third electromagnetic steel plate 323 of Modification 6 differ from the above-described embodiment and modification in that the protruding tip of the tooth 35 passes through the center in the circumferential direction of the tooth 35 and the stator core 31. It is formed in an asymmetric shape with respect to the straight line L1 extending in the radial direction. Therefore, performance such as torque and ripple can be easily obtained in accordance with the positive rotation direction of the rotor 20.

  In the above-described embodiment and modification, the example in which the rotating electrical machine according to the present invention is applied to a motor for a vehicle has been described. However, the present invention is not limited to a generator or a motor as a rotating electrical machine mounted on a vehicle. Can also be applied to rotating electrical machines that can selectively use both.

  DESCRIPTION OF SYMBOLS 1 ... Electric motor for vehicles (rotary electric machine), 20 ... Rotor, 21 ... Rotor core, 22 ... Electromagnetic steel plate, 23 ... Magnet accommodation hole, 27, 127, 227, 327, 427, 527 ... Permanent magnet, 30 ... Fixed Child, 31, 131, 231, 331 ... Stator core, 32, 132, 232, 332 ... Electromagnetic steel plate, 321 ... First electromagnetic steel plate, 321a ... First fall part, 322 ... Second electromagnetic steel plate, 322a ... Second Falling part, 323 ... third magnetic steel sheet, 323a ... removal part, 33 ... slot, 35 ... teeth, 36 ... stator winding.

Claims (5)

Rotor core having a plurality of permanent magnets (27, 127, 227, 327, 427, 527) formed by a plurality of electromagnetic steel plates (22) stacked in the rotation axis direction and embedded at a distance in the circumferential direction (21) and a plurality of slots (33) formed in an annular shape and arranged in the circumferential direction by a plurality of electromagnetic steel plates (32, 132, 232, 332) stacked in the rotation axis direction, A stator core (31, 131, 231 and 331) disposed on the outer side of the child core in a radial direction, and a stator winding (36) wound around the stator core, In the rotating electrical machine in which the length in the rotation axis direction of the permanent magnet is shorter than the length in the rotation axis direction of the rotor core and the stator core,
The stator core has a plurality of teeth (35) projecting inward in the radial direction and defining the slots on the side surfaces on both sides in the circumferential direction. A rotating electric machine characterized in that a direction length is set to be the same as a length in a rotation axis direction of the permanent magnet.   2. The rotating electrical machine according to claim 1, wherein a length of the stator core in a rotation axis direction is shorter than a length of the rotor core in a rotation axis direction.   The stator core is tilted to one side in the rotational axis direction at a part of the circumferential direction where the length of the protruding tip portion of the tooth is set to be the same as the length of the permanent magnet in the rotational axis direction. At least one of the first electromagnetic steel plate (321) having the first fallen portion (321a) and the second electromagnetic steel plate (322) having the second fallen portion (322a) tilted to the other side in the rotation axis direction A third electromagnetic steel sheet (323) having a removal portion (323a) from which a portion corresponding to the first and second collapsed portions has been removed is laminated in combination in a predetermined state. Item 3. The rotating electrical machine according to Item 1 or 2.   The protruding tip of the teeth is formed in a shape that is symmetrical with respect to a straight line (L1) that extends in the radial direction of the stator core through the circumferential center of the teeth. The rotating electrical machine according to any one of 3.   The protruding tip of the teeth is formed in an asymmetric shape with respect to a straight line (L1) extending in the radial direction of the stator core through the circumferential center of the teeth. The rotating electrical machine according to any one of 3.

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