Motor support structure

Abstract

To provide a support structure of a motor that can suppress vibration of a case integrated with a stator by holding the stator.SOLUTION: A support structure 1 of a motor comprises a case 3 for holding a three-phase AC motor 2 while accommodating the motor 2 having a rotor 6 arranged inside a stator 5, and is provided with a ring section 4 adhered to both an outer peripheral surface of the stator 5 and an inner peripheral surface of the case 3. The ring section 4 has: an inner cylinder ring section 4a brought into surface contact with the outer peripheral surface of the stator 5; an outer cylinder ring section 4b arranged in a concentric circle at a specific interval on an outer peripheral side of the inner cylinder ring section 4a, and having an outer peripheral surface brought into surface contact with the case 3; and multiple partitions 4c arranged at a specific interval in a circumferential direction of the ring section 4 between the inner cylinder ring section 4a and the outer cylinder ring section 4b so as to connect them. The partition 4c is arranged on an outer peripheral side of one specific phase among three phases of the motor 2.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a structure for supporting a stator of a motor on a fixing member such as a case.

Background Art

[0002] Patent Document 1 discloses a stator fixing structure aimed at suppressing an increase in iron loss due to an increase in compressive stress while ensuring a necessary tightening load. In the structure of Patent Document 1, the stator of the motor is fixed to the case via an outer cylinder ring. The stator core of the stator is formed by connecting a plurality of core segments formed in an arc shape in an annular shape, and its outer peripheral surface is fastened so as to be in surface contact with the inner peripheral surface of the outer cylinder ring by shrink fitting. The outer cylinder ring is fixed to the case by being fitted into the case. The outer cylinder ring is formed in a cylindrical shape with substantially the same diameter on the inner peripheral surface. In contrast, the diameter of the outer peripheral surface is smaller at the intermediate portion in the axial direction compared to other portions of the outer peripheral surface. Specifically, the outer diameters of the outer cylinder ring are equal to each other at both ends in the axial direction of the stator, and are smaller than the both ends at the intermediate portion in the axial direction. Further, the outer cylinder ring is housed inside the case and is fixed with a gap from the inner peripheral surface of the case. That is, a resin ring for enhancing the coaxial accuracy between the rotor and the stator is provided on the outer periphery of the axial end of the outer cylinder ring, and the outer cylinder ring is fixed to the case by the resin ring being fitted into the case.

[0003] Patent Document 1 states that with this configuration, a relatively large clamping load can be applied to the stator by the large outer diameters of the outer ring at both ends, thereby ensuring a clamping load sufficient to prevent the stator from coming loose during a collision. Furthermore, by reducing the outer diameter of the intermediate section compared to the outer diameters of the ends, it becomes possible to set the minimum clamping load necessary to hold the stator in the rotational direction against the reaction force generated on the stator when the motor rotates. This avoids an unnecessary increase in the clamping load in the intermediate section, thereby suppressing an increase in iron loss in the stator due to compressive stress. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2010-246259 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] Motors generate vibrations primarily due to fluctuations in electromagnetic force when generating torque. These vibrations are transmitted to other components through the case, generating noise. For example, in the structure described in Patent Document 1, the outer cylinder ring is fixed inside the case, and a resin ring is provided on the outer circumference of the axial end of the outer cylinder ring, interposed between it and the case. As a result, motor vibrations are transmitted to the case through the outer cylinder ring and the resin ring, potentially causing the vibrations and noise described above. Furthermore, since fluctuations in electromagnetic force vary depending on the number of poles of the motor, the vibrations generated in the stator also change accordingly. In other words, the magnitude of vibrations generated in the circumferential direction of the outer cylinder ring may differ, potentially leading to locally increased vibrations and noise in the case.

[0006] This invention has been made in view of the above-mentioned technical problems, and aims to provide a motor support structure that can hold the stator and suppress vibrations of the case integrated with the stator. [Means for solving the problem]

[0007] To achieve the above objective, the present invention provides a motor support structure comprising a case that houses and holds a three-phase AC motor, in which a rotor that rotates by magnetic force is arranged inside a stator having multiple pairs of magnetic poles, and a ring portion that is in close contact with the outer circumferential surface of the stator and the inner circumferential surface of the case, respectively, filling the space between the stator and the case, wherein the ring portion comprises an inner cylindrical ring portion that makes surface contact with the outer circumferential surface of the stator, an outer cylindrical ring portion that is arranged concentrically at a predetermined interval on the outer circumferential side of the inner cylindrical ring portion and whose outer circumferential surface makes surface contact with the case, and a plurality of partition portions that are provided between the inner cylindrical ring portion and the outer cylindrical ring portion at a predetermined interval in the circumferential direction of the ring portion and connect the inner cylindrical ring portion and the outer cylindrical ring portion, wherein the partition portions are arranged on the outer circumferential side of a specific one of the three phases of the motor. The stator has a plurality of teeth that protrude radially inward from the inner circumferential surface with a predetermined clearance, and a plurality of slots which are gaps between two adjacent teeth, the particular phase being a U-phase, the fastening of the stator to the ring portion and the fastening of the case to the ring portion being shrink-fit, and the circumferential width of the partition portion being formed to be the sum of the width of one tooth and the width of two slots. It is characterized by the presence of [something].

[0008] Furthermore, in the present invention, the number of partitions may be formed in a number obtained by multiplying the number of pole pairs, which is the number of pairs of magnetic poles of the motor, by a power of 2, and may be provided at positions that are symmetrical with respect to the rotation center of the motor.

[0009] Furthermore, in the present invention, the number of partitions may be the same as the number of a specific phase in the motor.

[0010] Furthermore, in the present invention, the ring portion may have a gap between the inner cylindrical ring portion and the outer cylindrical ring portion in the radial direction, and the gap may be partitioned in the radial direction by the partition portion, thereby forming a flow path for cooling the motor.

[0011] and, In the present invention, the partition portion may have a bent portion that is folded in the circumferential direction of the ring portion. [Effects of the Invention]

[0013] According to the motor support structure of the present invention, in a three-phase AC inner rotor type motor having multiple pairs of magnetic poles, a ring portion is provided that is in close contact with the outer circumferential surface of the stator and the inner circumferential surface of the case, respectively, filling the space between the stator and the case. The ring portion comprises an inner cylindrical ring portion that makes surface contact with the outer circumferential surface of the stator, an outer cylindrical ring portion that makes surface contact with the inner circumferential surface of the case, and a partition portion that connects the inner cylindrical ring portion and the outer cylindrical ring portion. The partition portion is located on the outer circumferential side of a specific one of the three phases of the motor. During driving and power generation, the motor experiences fluctuations in electromagnetic force due to changes in the current flowing through each coil. Due to these fluctuations in electromagnetic force, vibration components that are regular and different for each phase of the motor are generated in the stator according to the number of poles of the motor and are transmitted to the case via the ring portion. At that time, since the partition portion of the ring portion is provided corresponding to the outer circumferential side of a specific one phase, the magnitude and direction of the vibrations transmitted to the case are suppressed from being different for each partition portion. Therefore, it is possible to suppress the localized amplification of vibrations in the case due to superposition or resonance, and to prevent or suppress the generation of noise caused by those vibrations.

[0014] Furthermore, if the number of partitions is equal to a power of 2 of the number of pairs of magnetic poles in the stator, the vibrations transmitted to the case or variations in their levels can be suppressed even more effectively. In particular, if the number of partitions is the same as a specific phase in the stator, the vibrations transmitted to the case will mainly be limited to those caused by the displacement of that specific magnetic pole. Therefore, the vibrations transmitted to the case and variations in their levels can be further suppressed, and the increase in local vibrations and noise can be further reduced.

[0015] Furthermore, even when the partition forms a flow path for cooling the motor, the increase in local vibrations and noise in the case can be suppressed simply by changing the circumferential position of the partition as described above. In other words, the partition can form a flow path without reducing the cooling performance of the motor.

[0016] Furthermore, if the partition section has a bent section, a radial load is transmitted from the stator to the ring section, causing bending deformation in the bent section. In other words, since the bent section absorbs energy, the vibrations transmitted from the stator to the case via the partition section can be suppressed. [Brief explanation of the drawing]

[0017] [Figure 1] This figure shows an example of a motor support structure in an embodiment of the present invention, and is a cross-sectional view of the motor as seen from the axial direction. [Figure 2] This diagram omits the case from the structure shown in Figure 1 and specifically illustrates the rotor. [Figure 3] This is a comparative diagram showing the vibration level generated in the transaxle case relative to the vibration frequency generated in the stator, in the motor support structure in an embodiment of the present invention and the motor support structure in a comparative example. [Figure 4] This figure shows another example of a motor support structure in an embodiment of the present invention, and is an enlarged view showing only one of a plurality of partitions. [Figure 5] This figure shows yet another example of a motor support structure in an embodiment of the present invention, and is an enlarged view showing only one of a plurality of partitions. [Modes for carrying out the invention]

[0018] The present invention will be described below based on the embodiments shown in the figures. The embodiments described below are merely examples of how the present invention can be implemented and do not limit the present invention.

[0019] FIG. 1 shows an example of a motor support structure 1 according to an embodiment of the present invention. In the example shown in FIG. 1, the motor support structure 1 is applied to a vehicle not shown, and the motor 2 is supported by a transaxle case 3 of the vehicle. The transaxle case 3 is a case that houses a transaxle in which a transmission and a differential gear, both not shown, are integrated between a driving force source such as an engine or the motor 2 and a member on the output side such as a driving wheel on the power transmission path of the vehicle. As shown in FIG. 1, the motor 2 is supported inside a cylindrically formed transaxle case 3 via a ring portion 4. The vehicle may be a vehicle equipped with the motor 2 as a driving force source, such as a conventionally known electric vehicle or a hybrid vehicle.

[0020] The motor 2 is a three-phase alternating current type motor 2 in which a rotor 6 that rotates by magnetic force is arranged inside a stator 5 having a plurality of pairs of magnetic poles. The motor 2 is configured to generate a torque corresponding to the current in the rotor 6 by changing the magnetic field by changing the current flowing through the stator coil of the stator 5. The motor 2 is an inner rotor type motor 2 and has a function as a generator capable of generating electricity not only to assist or apply the driving force of the vehicle but also to regenerate energy. The motor 2 is a three-phase alternating current type 8-pole motor composed of a stator 5 having three-phase coils and a rotor 6 arranged on the inner peripheral side of the stator 5.

[0021] The stator 5 is a stator of the motor 2 and is a cylindrical member arranged with a predetermined radial gap, also called an air gap, between it and the outer peripheral side of the rotor 6. The stator 5 includes a stator core 7 formed of electromagnetic steel sheets and a stator coil (not shown) attached to the stator core 7. The stator core 7 is formed by laminating a plurality of annular electromagnetic steel sheets and connecting them axially, for example, by caulking.

[0022] As shown in Figure 1, the stator core 7 has an annular back yoke (core back) 8 and a plurality of teeth 9 that protrude radially inward from the inner circumference of the back yoke 8. The plurality of teeth 9 are formed at equal intervals with a predetermined clearance in the circumferential direction of the stator core 7, and a slot 10 is formed between two adjacent teeth 9. For the sake of simplicity in the drawings, only one of the plurality of teeth 9 and slot 10 is labeled in Figures 1 and 2.

[0023] The slot 10 has an opening shape that extends radially along the longitudinal direction of the stator core 7 and is provided at equal intervals in the circumferential direction according to the multiple teeth 9. The stator coil is housed in the slot 10. In addition, insulating paper is placed inside the slot 10 to insulate the stator core 7 and the stator coil as needed.

[0024] The stator coil has U-phase coils, V-phase coils, and W-phase coils, and is mounted in slot 10. The stator coil is formed by electrically connecting segment coils (not shown) that are inserted radially in multiple layers inside the slot 10 of the stator core 7. The segment coil is formed by bending a single flat wire (not shown) to form a U-shaped cross-section. The flat wire is a conductor with a rectangular cross-section, and its surface is covered with an insulating coating such as enamel. In the motor 2 shown in Figures 1 and 2, 48 slots 10 are formed, and coils of the same phase, such as segment coils, are inserted in every 6 slots 10 in the circumferential direction. Therefore, for example, a tooth 9 in which a U-phase coil is mounted may be referred to as the U-phase in the motor 2, or the U-phase in the stator.

[0025] Although not shown in the diagrams, the wires connected to the stator coil are electrically connected to the inverter, and the inverter is electrically connected to the battery by another wire. The wires from the inverter are connected to the U terminal, V terminal, and W terminal, which correspond to the U phase, V phase, and W phase, respectively. Sensors detect the driver's operation of the accelerator and brake pedals, and information representing the operation status is communicated to the inverter as an electrical signal via an electronic control unit. When the inverter receives this electrical signal, it instructs the battery to provide power, converts the DC current from the battery into AC current, and supplies power to the motor 2.

[0026] The rotor 6 is the rotor of the motor 2 and is a cylindrical member positioned with a predetermined gap between it and the inner circumference of the stator 5. As shown in Figure 2, the rotor 6 has a rotor core 11 made of multiple laminated electromagnetic steel sheets, an axial hole 12 that penetrates the rotor core 11, multiple magnet holes 14 for embedding multiple permanent magnets 13, and multiple flux barriers 15 which are holes for suppressing magnetic flux leakage from the permanent magnets 13. For the sake of simplifying the drawing, in Figure 2, only some of the multiple permanent magnets 13, multiple magnet holes 14, and multiple flux barriers 15 are labeled with reference numerals.

[0027] The shaft hole 12 is a through hole for fitting a rotor shaft (not shown) that rotates integrally with the rotor core 11, and is formed at the center of the rotor core 11. The rotor shaft is connected, for example, to a vehicle wheel to apply torque. The plurality of magnet holes 14 are holes into which permanent magnets 13 are inserted, and include a plurality of first magnet holes 14a formed so as to extend circumferentially on the outer edge of the rotor core 11, and a pair of second magnet holes 14b arranged on both sides of the first magnet holes 14a in the circumferential direction and provided so as to extend radially on the rotor core 11.

[0028] The flux barrier 15 is provided to suppress the leakage of magnetic flux from the permanent magnet 13 to the side surface of the rotor 6. The flux barrier 15 has a pair of first flux barriers 15a formed adjacent to the first magnet hole 14a and a second flux barrier 15b formed adjacent to the second magnet hole 14b. The pair of first flux barriers 15a are formed near both ends in the circumferential direction of the first magnet hole 14a. The second flux barrier 15b is formed between the radially inner end of one of the pair of second magnet holes 14b and the radially inner end of the other of the pair of second magnet holes 14b.

[0029] As described above, the first magnet hole 14a, a pair of second magnet holes 14b, three permanent magnets 13 inserted into the first magnet hole 14a and the pair of second magnet holes 14b, a pair of first flux barriers 15a and second flux barriers 15b form a set that forms one magnetic pole. The magnetic poles are formed so that the south poles and north poles alternate in the circumferential direction of the rotor core 11. For example, in the motor 2 shown in Figure 1, if the set located at the very top of the rotor core 11 is the north pole, then the sets on both adjacent sides in the circumferential direction of the rotor core 11 will both be south poles. The motor 2 shown in Figure 1 has eight such sets. That is, the motor 2 shown in Figure 1 has 8 poles and therefore 4 pole pairs.

[0030] As shown in Figure 1, the ring portion 4 is interposed to fill the gap between the stator 5 and the transaxle case 3 in order to fix the stator 5 to the transaxle case 3. The ring portion 4 is in close contact with both the stator 5 and the transaxle case 3 and is integrated by shrink-fitting. The ring portion 4 has an inner cylindrical ring portion 4a that is fitted onto the stator 5 by shrink-fitting, an outer cylindrical ring portion 4b that is arranged concentrically on the outer circumference of the inner cylindrical ring portion 4a at a predetermined interval and fitted onto the transaxle case 3 by shrink-fitting, and a plurality of partition portions 4c that extend between the inner cylindrical ring portion 4a and the outer cylindrical ring portion 4b.

[0031] The inner cylinder ring portion 4a is formed to have an axial length approximately the same as the axial length of the stator 5, and is formed to cover the entire outer circumferential surface of the stator 5. The outer cylinder ring portion 4b is formed to have an axial length approximately the same as the axial length of the transaxle case 3, and is formed to cover the entire inner circumferential surface of the transaxle case 3. The radial gap between the inner cylinder ring portion 4a and the outer cylinder ring portion 4b serves as a flow path 4d for the flow of oil (not shown) that cools the motor 2. Each flow path 4d is divided by a partition portion 4c. Because the stator 5 and the inner cylinder ring portion 4a are integrated by shrink fitting, the outer circumferential surface of the stator 5 and the inner circumferential surface of the inner cylinder ring portion 4a are in surface contact. Therefore, the cooling effect of the oil flowing through the flow path on the motor 2 is relatively high.

[0032] As shown in Figures 1 and 2, the multiple partition portions 4c are formed between the inner cylinder ring portion 4a and the outer cylinder ring portion 4b, arranged at predetermined intervals in the circumferential direction of the ring portion 4. Specifically, the intervals between the multiple partition portions 4c are equal, and each of the multiple partition portions 4c is formed to be located radially outward of the same phase among the three-phase coils in the stator 5. In the embodiment shown in Figure 1, the partition portions 4c are formed to overlap the radially outward of the U-phase among the three-phase coils, and the partition portions 4c are provided in positions symmetrical with respect to the rotation center of the motor 2. Specifically, the partition portions 4c are formed radially outward of 8 of the 16 U-phases in the stator 5 that are arranged at equal intervals. That is, the partition portions 4c are located radially outward of the U-phases in which the direction of the current flowing is the same. Furthermore, the circumferential length of the ring portion 4 of the partition portion 4c (width of the partition portion 4c) is formed to be approximately equal to the sum of the width of one tooth 9 and the width of the two slots 10. Note that the U phase in the motor 2 corresponds to one specific phase of the three phases in the embodiment of the present invention.

[0033] In the motor 2 configured in this way, the rotor 6 is rotated by a rotating magnetic field generated when alternating current flows through each coil with different phases, causing the motor 2 to generate torque. At that time, changes in the current flowing through each coil cause fluctuations in the electromagnetic force, resulting in an electromagnetic excitation force that causes the teeth 9 to vibrate. For example, in the case of a motor as shown in Figure 1, four pairs of magnetic poles are formed, so an electromagnetic excitation force with a rotational order that is an integer multiple of 4 is generated. Since the stator 5 is fastened to the transaxle case 3 via the ring portion 4, vibrations due to the electromagnetic excitation force are transmitted from the stator 5 to the transaxle case 3. Furthermore, the vibrations caused by the fluctuations in the electromagnetic force of the stator 5 become regular according to the number of poles of the motor 2, and vibrations with different components occur depending on each phase of the stator 5. Specifically, in the case of an 8-pole motor as shown in Figure 1, larger vibrations may occur near each tooth 9 on which the U-phase coil is attached, compared to other parts in the circumferential direction of the stator 5. If the vibrations transmitted to the transaxle case 3 differ for each ring section 4, it is possible that localized vibrations in the ring section 4 and the transaxle case 3 may increase.

[0034] In contrast, in the motor support structure 1 shown in Figures 1 and 2, a partition portion 4 is formed radially outward of a specific one of the three phases in the motor 2. Specifically, a partition portion 4c is formed radially outward of every other U-phase among the multiple U-phases in the stator. That is, in the stator 5, the partition portion 4c is formed at positions where the vibration levels caused by fluctuations in electromagnetic force are of similar magnitude. The partition portion 4c extends radially and connects the inner cylindrical ring portion 4a, which is shrink-fitted to the stator 5, and the outer cylindrical ring portion 4b, which is shrink-fitted to the transaxle case 3. Therefore, the variation in the magnitude of vibrations transmitted from the stator 5 to the transaxle case 3 via the ring portion 4 can be suppressed by the partition portion 4c. As a result, it is possible to suppress localized increases in vibrations occurring in the ring portion 4 and the transaxle case 3, and to prevent or suppress the generation of noise caused by such vibrations.

[0035] Figure 3 is a comparative diagram showing the vibration levels generated in the transaxle case 3 according to frequency (vibration frequency) when the motor support structure 1 in the embodiment of the present invention is applied and when the motor support structure in the comparative example is applied. In the comparative example, Comparative Example 1, in which the number of partition portions 4c in the ring portion 4 is 6, and Comparative Example 2, in which the number of partition portions 4c in the ring portion 4 is 12 are shown. The structure of the motor 2 in each comparative example is the same as in the embodiment described above, and is a three-phase AC type motor 2 with 8 poles. Therefore, the multiple partition portions 4c in each comparative example include partition portions 4c located radially outside the U-phase of the stator 5 in the circumferential direction, and partition portions 4c located radially outside the V-phase or W-phase.

[0036] In the comparative examples and embodiments described above, when the output torque of the motor 2 is changed to gradually increase the frequency of vibrations generated in the motor 2, as shown in Figure 3, the vibration level increases as the frequency increases in all cases. In the process of the frequency gradually increasing, in the case of Comparative Example 1, where the number of partition portions 4c is 6, the vibration level temporarily increased sharply when the frequency was relatively low, and then temporarily decreased sharply. In the case of Comparative Example 2, where the number of partition portions 4c is 12, the vibration level temporarily decreased sharply, and there were repeated relatively large increases and decreases in the vibration level. In the embodiments of the present invention, the sharp changes in the vibration level like those in Comparative Examples 1 and 2 were not detected. That is, according to the embodiments described above, sharp fluctuations in the vibration level transmitted from the stator 5 to the transaxle case 3 via the ring portion 4 are suppressed. In other words, according to the embodiments shown in Figures 1 and 2, localized increases in vibration and noise of the transaxle case 3 are prevented or suppressed.

[0037] Next, a motor support structure in another embodiment of the present invention will be described. Figure 4 shows a magnified view of the area around one of the multiple partition portions 20c that connect the inner cylindrical ring portion 20a and the outer cylindrical ring 20b of the ring portion 20. The partition portion 20c shown in Figure 4 has a bent portion 21 formed in which the central part of the partition portion 20c is bent in the radial direction.

[0038] Figure 5 is a diagram corresponding to Figure 4, and shows a motor support structure in yet another embodiment of the present invention. In the partition portion 30c shown in Figure 5, a portion with a U-shaped cross-section is formed in the central part of the partition portion 30c in the radial direction. Specifically, the partition portion 30c shown in Figure 5 is formed by a portion that protrudes radially from the inner cylinder ring portion 30a and the outer cylinder ring portion 30b, and a U-shaped curved portion 31 that is bent and curved in the circumferential direction from the protruding portion. The curved portion 31 corresponds to the bent portion in the embodiment of the present invention.

[0039] In other embodiments of the present invention and even further embodiments of the motor support structure 1, there is a partition portion 4c in which a bent portion 21 or a curved portion 31 is formed in the central part in the radial direction. Therefore, when the stator 5 vibrates due to electromagnetic excitation force and the radial vibration of that vibration is transmitted to the inner cylinder ring portion 4a, bending deformation occurs in the bent portion 21 or curved portion 31. Therefore, the partition portion 4c can absorb or attenuate the mainly radial vibration component transmitted from the stator 5. Thus, the vibration transmitted from the stator 5 to the transaxle case 3 via the partition portion 4c can be reduced.

[0040] The bent portion 21 or curved portion 31 may be formed on all of the multiple partition portions 4c formed in the ring portion 4, or it may be formed on only some of the multiple partition portions 4c. If the bent portion 21 is formed on some of the partition portions 4c, it is preferable that the partition portions 4c having the bent portion 21 are formed on the diagonal of the ring portion 4.

[0041] Although embodiments of the present invention have been described above, the present invention is not limited to the examples described above, and may be modified as appropriate within the scope of achieving the objectives of the present invention. For example, the number of partitions 4c, 20c, and 30c is not limited to the numbers shown in Figures 1 and 2, but can be the number obtained by multiplying the number of pole pairs of motor 2 by a power of 2 (i.e., number of pole pairs × 2). (n―1) There may be as many as (n: a natural number). The positions where the partitions 4c, 20c, and 30c are formed only need to be equally spaced in the circumferential direction of the ring portions 4, 20, and 30. In other words, they only need to be formed on the outer circumference of a specific phase in the motor 2. [Explanation of Symbols]

[0042] 1. Motor support structure 2 motors 3. Transaxle Case (Case) 4,20,30 Ring section 4a, 20a, 30a Inner cylinder ring section 4b, 20b, 30b Outer cylinder ring section 5 status 6 rotors 9 Teeth 10 slots 11 recess 21. Bending section 31. Curved section (bent section)

Claims

1. A motor support structure comprising a case that houses and holds a three-phase AC motor, in which a rotor that rotates by magnetic force is arranged inside a stator having multiple pairs of magnetic poles, and a ring portion that is in close contact with the outer circumferential surface of the stator and the inner circumferential surface of the case, respectively, filling the space between the stator and the case, The aforementioned ring portion is The inner cylinder ring portion that makes surface contact with the outer circumferential surface of the stator, An outer ring portion is arranged concentrically on the outer circumference of the inner ring portion at predetermined intervals, and its outer surface is in surface contact with the case. The ring has a plurality of partitions that are provided between the inner ring portion and the outer ring portion at predetermined intervals in the circumferential direction of the ring portion, connecting the inner ring portion and the outer ring portion. The partition portion is arranged on the outer circumference of a specific one of the three phases of the motor. The stator is, Multiple teeth protruding radially inward from the inner circumferential surface with a predetermined clearance, It has a plurality of slots which are gaps between two adjacent teeth among the plurality of teeth, The aforementioned specific phase is the U phase, The fastening of the stator to the ring portion and the fastening of the case to the ring portion are both done by shrink fitting. The circumferential width of the partition is formed to be the sum of the width of one tooth and the width of the two slots. A motor support structure characterized by the following features.

2. A motor support structure according to claim 1, The aforementioned partition is, The number of pole pairs, which is the number of magnetic pole pairs of the motor, is formed in a number obtained by multiplying the number of pole pairs by a power of 2, and It is provided at a position symmetrical with respect to the rotation center of the aforementioned motor. A motor support structure characterized by the following features.

3. A motor support structure according to claim 1 or 2, The number of partitions is the same as the number of a specific phase in the motor. A motor support structure characterized by the following features.

4. A motor support structure according to claim 1 or 2, The ring portion has a gap between the inner cylindrical ring portion and the outer cylindrical ring portion in the radial direction. The gap, partitioned radially by the partition, forms a cooling channel for the motor. A motor support structure characterized by the following features.

5. A motor support structure according to claim 1 or 2, The partition portion has a bent portion that is folded in the circumferential direction of the ring portion. A motor support structure characterized by the following features.

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