JP5343656B2 - Motor stator core assembly - Google Patents

Description

  The present invention relates to a stator core assembly of a motor used in an electric vehicle such as a hybrid vehicle or an electric vehicle.

  Conventionally, as a motor used for an electric vehicle of a hybrid vehicle or an electric vehicle, for example, a motor described in Patent Document 1 has been proposed. In this motor, an annular stator core is press-fitted into a cylindrical motor case and fixed to the inner surface. One end side of the motor case is closed by an end wall, and a motor case fixing portion for fixing the motor case to peripheral components is provided on the end wall.

  In the motor configured as described above, when vibration is generated from the stator core during driving, the vibration is transmitted to the motor case. The vibration transmitted to the motor case is transmitted to peripheral parts via the motor case fixing portion. For this reason, noise is generated from the peripheral parts.

  Therefore, in Patent Document 1, in order to solve the above problem, in a stator core assembly including a motor case and a stator core, a strip-shaped notch is provided on the entire outer peripheral surface of the stator core. As a result, the contact area between the stator core and the motor case is reduced, so that vibration transmitted from the stator core to the motor case can be suppressed. As a result, the vibration transmitted to the motor case fixing part is also suppressed, so that noise generated from peripheral parts is reduced.

JP 2001-342594 A

  However, in the conventional stator core assembly, in order to reduce the size of the motor, if the distance between the end wall of the motor case and the axial direction of the stator core is shortened, vibration is easily transmitted from the stator core to the end wall of the motor case. Become. As a result, vibration is easily transmitted from the motor case fixing portion to the peripheral components, and there is a possibility that noise generated from the peripheral components may increase.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a stator core assembly of a motor that can reduce noise generated from peripheral components even when the motor is downsized. .

  In order to solve the above-described problems, in the stator core assembly of the motor according to the present invention, vibration reduction means for suppressing vibration transmitted from the stator core is fixed to the peripheral part at a portion of the motor case located on the end wall side of the stator core. And a motor case fixing part for arranging the vibration reducing means so as to be closer to the contact portion with the stator core than the motor case fixing part.

  As a result, in the stator core assembly of the motor of the present invention, in order to reduce the size of the motor, the distance between the end wall of the motor case and the axial direction of the stator core is shortened so that vibration is easily transmitted to the end wall. However, the vibration is suppressed by the vibration reducing means before reaching the motor fixing portion. Therefore, vibration transmitted from the motor case fixing part to the peripheral parts can also be suppressed. Therefore, the stator core assembly of the motor of the present invention can reduce noise generated from peripheral parts even when the motor is downsized.

It is a disassembled perspective view of the stator core assembly which shows the 1st Embodiment of this invention. It is a front view of the motor case which shows the embodiment. It is a longitudinal cross-sectional view of the principal part of the stator core assembly which shows the same embodiment. It is a figure which shows the arrangement | positioning relationship between the through-hole and notch which show the embodiment. It is a disassembled perspective view of the stator core assembly which shows the 2nd Embodiment of this invention. It is a figure which shows the arrangement | positioning relationship between the through-hole and notch which show the embodiment. It is a disassembled perspective view of the stator core assembly which shows the 3rd Embodiment of this invention. It is a front view of the motor case which shows the embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First embodiment:
FIG. 1 is an exploded perspective view of a stator core assembly 1 of a motor showing a first embodiment of the present invention. The stator core assembly 1 includes a motor case 2 and a stator core 3. Below, each structure of the motor case 2 and the stator core 3 is demonstrated.

<Motor case 2>
The motor case 2 is formed in a cylindrical shape. One end of the motor case 2 is closed by an end wall 21. The end wall 21 is formed in a circular shape, and a bearing hole 22 is provided at the center thereof. The bearing hole 22 rotatably supports a rotor shaft (not shown) via a support member (not shown). In the end wall 21, three through holes 23 and three motor case fixing holes 24 are provided around the bearing holes 22.

  The three through holes 23 are vibration reducing means of the present invention. As shown in FIG. 2, the three through holes 23 are arranged at equal intervals over the entire outer peripheral edge portion of the end wall 21. Each through hole 23 is formed in a substantially arc shape along the outer peripheral edge of the end wall 21. As for the intermediate part 23a of each through-hole 23, the inner peripheral surface 23b protrudes in the circular arc shape toward the outer peripheral surface 23c.

  On the other hand, each motor case fixing hole 24 is a motor case fixing portion of the present invention. As shown in FIG. 2, each motor case fixing hole 24 is disposed on the inner peripheral side of the intermediate portion 23 a of each through hole 23. Further, as shown in FIG. 3, a fastening member 10 such as a bolt is inserted into each motor case fixing hole 24. By fixing the fastening member 10 to the peripheral component 11 of the motor, the motor case 2 is fixed to the peripheral component 11.

<Stator core 3>
The stator core 3 is formed in an annular shape as shown in FIG. A large number of tooth portions 31 are provided at equal intervals on the inner peripheral side of the stator core 3. A coil (not shown) is wound around these tooth portions 31. And as shown in FIG. 3, the stator core 3 is press-fitted inside from the other end side of the motor case 2 and is fixed to the inner peripheral surface 2a. A rotor (not shown) is arranged inside the stator core 3 fixed to the inner peripheral surface 2a in this way.

  Further, a specific configuration of the stator core 3 will be described. As shown in FIG. 3, the stator core 3 is formed by laminating a plurality of annular electromagnetic steel plates 30 along the axial direction A of the motor case 2, and the adjacent electromagnetic steel plates 30 and 30 are fastened by caulking or the like. Configured.

  As shown in FIG. 4, three notches 32 are provided on the outer peripheral surface 3 a of the stator core 3. Specifically, the three notches 32 are arranged at equal intervals in the circumferential direction B over the entire outer peripheral surface 3 a of the stator core 3. Further, the three cutout portions 32 are arranged at the same position in the circumferential direction B as the three through holes 23 of the motor case 2.

  Further, as shown in FIG. 3, each notch 32 is cut out at a predetermined portion from the one end facing the end wall 21 of the motor case 2 toward the other end on the outer peripheral surface 3 a of the stator core 3. Is formed. Thus, a gap S is formed between each notch 32 and the inner peripheral surface 2 a of the motor case 2.

  Next, the vibration suppressing action of the stator core assembly 1 configured as described above will be described. When the motor is driven, vibration V1 is generated from the stator core 3 as shown in FIG. The direction of the vibration V <b> 1 is the radial direction C of the stator core 3. This vibration V <b> 1 is transmitted from the stator core 3 to the end wall 21 via the peripheral wall 20 of the motor case 2. The direction of the vibration V <b> 2 generated in the end wall 21 is the radial direction C and the axial direction A of the stator core 3.

  Here, each through hole 23 is disposed at a position closer to the contact portion 20 a with the stator core 3 than each motor case fixing hole 24. For this reason, the vibration V <b> 1 transmitted from the stator core 3 to the peripheral wall 20 is transmitted to each motor case fixing hole 24 via each through hole 23. For this reason, since this vibration V1 is suppressed by each through hole 23 before being transmitted to each motor case fixing hole 24, vibration V2 transmitted from each motor case fixing hole 24 to the peripheral component 11 is also suppressed.

  Therefore, in the stator core assembly 1 of the present embodiment, the distance L between the end wall 21 of the motor case 2 and the axial direction A of the stator core 3 is shortened to vibrate the end wall 21 in order to reduce the size of the motor. Even if V1 is easily transmitted, the vibration V1 is suppressed at each through hole 23 before reaching each motor case fixing hole 24. As a result, vibration V2 transmitted from each motor case fixing hole 24 to the peripheral component 11 is also suppressed. Therefore, the stator core assembly 1 of the present embodiment can reduce noise generated from the peripheral components 11 even when the motor is downsized.

  Furthermore, in the stator core assembly 1 of the present embodiment, the vibration reducing means of the present invention is configured from three through holes 23. Therefore, in the stator core assembly 1 of the present embodiment, the vibration V2 to the peripheral component 11 can be suppressed by simplifying the configuration of the vibration reducing means. Therefore, the stator core assembly 1 of the present embodiment can reduce the noise generated from the peripheral component 11 while suppressing the manufacturing cost.

  Further, in the stator core assembly 1 of the present embodiment, as shown in FIG. 2, the inner peripheral surface 23b of the intermediate portion 23a of each through hole 23 is protruded toward the outer peripheral surface 23c, so that the motor case fixing hole 24 is provided. It was made to provide. Therefore, since the installation range of the motor case fixing hole 24 is expanded, the fixing position of the motor case 2 can be set according to the surrounding situation. Therefore, the stator core assembly 1 of the present embodiment can increase the degree of freedom in installing the motor.

  Each motor case fixing hole 24 is preferably installed in a fan-shaped range D as shown in FIG. This range D is set by connecting the left and right ends of each through hole 23 and the center O of the bearing hole 22, and is a range in which the vibration V <b> 2 generated in the end wall 21 is small.

  Further, in the stator core assembly 1 of the present embodiment, the three cutout portions 32 are provided over the entire outer peripheral surface 3 a of the stator core 3. Thereby, as shown in FIG. 3, a gap S is formed between the stator core 3 and the motor case 2, so that the contact area between the stator core 3 and the motor case 2 is reduced. For this reason, since the vibration transmitted from the stator core 3 to the motor case 2 is further suppressed, the vibration transmitted from the motor case 2 to the peripheral component 11 is further suppressed. Therefore, the stator core assembly 1 of the present embodiment can further reduce the noise generated from the peripheral component 11.

  Furthermore, in the stator core assembly 1 of the present embodiment, as shown in FIG. 4, the through holes 23 and the notches 32 are arranged at the same position in the circumferential direction B. That is, each through hole 23 and each notch 32 are close to each other as shown in FIG. Therefore, the vibration V <b> 1 generated in the portion around each notch portion 32 is suppressed by the through hole 23 as soon as it is transmitted to the portion corresponding to this in the motor case 2. For this reason, in each motor case fixing hole 24, the vibration V2 in the radial direction C is particularly suppressed. As a result, vibration transmitted from each motor case fixing hole 24 to the peripheral component 11 is further suppressed. Therefore, the stator core assembly 1 of the present embodiment can further reduce the noise generated from the peripheral component 11.

  Further, in the stator core assembly 1 of the present embodiment, as shown in FIG. 4, the three cutout portions 32 are partially provided over the entire outer peripheral surface 3 a of the stator core 3. As a result, the stator core assembly 1 of the present embodiment has all the electromagnetic steel sheets 30 attached to the inner peripheral surface 2a of the motor case 2 as compared with the case where the notch is provided in a strip shape over the entire outer peripheral surface of the stator core. Thus, it is possible to suppress vibration transmitted to the peripheral component 11 in a state of being securely fixed. Therefore, the stator core assembly 1 of the present embodiment can reduce the noise generated from the peripheral components 11 while increasing the accuracy of assembly of the stator core 3 with respect to the motor case 2.

  Further, the stator core assembly 1 of the present embodiment increases the accuracy of the assembly of the stator core 3 with respect to the motor case 2, so that even if vibration or impact occurs in the stator core 3 during driving of the motor, the electromagnetic steel plate 30 It becomes possible to prevent the lifting of.

Second embodiment:
FIG. 5 is an exploded perspective view of the stator core assembly 101 of the motor showing the second embodiment of the present invention. The stator core assembly 101 includes a motor case 2 and a stator core 103.

  The structure of the motor case 2 is as described in the first embodiment. The stator core 103 has the same basic structure as the stator core 3 described in the first embodiment. However, as shown in FIG. 6, the three cutout portions 32 provided on the outer peripheral surface 103 a of the stator core 103 are alternately arranged in the circumferential direction B with the through holes 23 of the motor case 2.

  That is, the three through holes 23 and the three cutouts 32 are entirely arranged in the circumferential direction B. For this reason, in the end wall 21 of the motor case 2, the vibration V2 (refer FIG. 3) of radial direction C is suppressed entirely. Thereby, in the motor case fixing hole 24, the vibration V2 in the axial direction A generated based on the vibration V2 in the radial direction C is particularly suppressed. As described above, the stator core assembly 101 according to the present embodiment can further suppress the vibration transmitted to the peripheral component 11 (see FIG. 3), similarly to the stator core assembly 1 according to the first embodiment. The noise generated from the peripheral component 11 can be reduced.

  Further, since the basic structure of the stator core assembly 101 of the present embodiment is the same as described above, the same effects as those described for the stator core assembly 1 of the first embodiment are the same. An effect can be obtained.

Third embodiment:
FIG. 7 is a perspective view of a stator core assembly 201 showing a third embodiment of the present invention. The stator core assembly 201 includes a motor case 202 and a stator core 3.

  The structure of the stator core 3 is as described in the first embodiment. In this embodiment, the motor case 202 will be described. In this motor case 202, the same parts as those of the motor case 2 of the above embodiment are denoted by the same reference numerals, and different parts will be described.

  In the motor case 202, each through hole 223 is provided from the end wall 221 to the peripheral wall 220. This will be specifically described. Each through hole 223 includes a first through hole 223a, a second through hole 223b, and a third through hole 223c.

  The shape of the first through hole 223a is a shape without the intermediate portion 23a of the through hole 23 shown in FIG. The second through hole 223b is formed in a substantially trapezoidal shape. The second through hole 223b is coupled to the outer end side of the first through hole 223a and formed to the outer peripheral edge of the end wall 221. The third through hole 223c is formed in a rectangular shape. The third through hole 223c is coupled to the outer end side of the second through hole 223b and is formed at the outer peripheral edge portion of the peripheral wall 220 on the end wall 221 side.

  As described above, the through hole 223 is provided to extend from the end wall 221 of the motor case 202 to the peripheral wall 220, so that the motor case fixing hole 224 is provided in the first embodiment as shown in FIG. It can be provided on the outer peripheral edge side of the end wall 221 with respect to the described motor case fixing hole 24 (see FIG. 2). That is, the degree of freedom of the installation range of the motor case fixing hole 224 is widened, and the fixing position of the motor case 202 can be set according to the surrounding situation. Therefore, the stator core assembly 201 of the present embodiment can increase the degree of freedom of motor installation.

  Further, since the basic structure of the stator core assembly 201 of the present embodiment is the same as described above, the same effects as those described for the stator core assembly 1 of the first embodiment are the same. An effect can be obtained.

  As mentioned above, although embodiment concerning this invention was illustrated, these embodiments do not limit the content of this invention. Various modifications can be made without departing from the scope of the claims of the present invention.

  For example, in the third embodiment, the through hole 223 is formed from the end wall 221 of the motor case 202 to the peripheral wall 220, but the through hole 223 may be provided toward the peripheral wall 220 of the motor case 202. In each embodiment, the motor case is provided with a through hole as the vibration reducing means of the present invention. However, as another vibration reducing means, a vibration absorbing material such as rubber is fitted into the through hole. Alternatively, a predetermined portion of the end wall or the peripheral wall of the motor case may be made of a vibration absorbing material.

DESCRIPTION OF SYMBOLS 1 Stator core assembly 2 Motor case 2a Inner peripheral surface 3 Stator core 3a Outer peripheral surface 11 Peripheral part 20 Peripheral wall 20a Contact part 21 End wall 23 Through hole 24 Motor case fixing hole 30 Electrical steel plate 32 Notch 101 Stator core assembly 103 Stator core 103a Outer peripheral surface 201 Stator core assembly 202 Motor case 220 Peripheral wall 221 End wall 223 Through hole 224 Motor case fixing hole A Axial direction B Circumferential direction V1 Vibration transmitted from stator core

Claims (7)

A stator core of a motor comprising a motor case formed in a cylindrical shape and having one end closed by an end wall, and an annular stator core that is press-fitted inside from the other end of the motor case and fixed to the inner peripheral surface In the assembly,
A vibration reduction means for suppressing vibration transmitted from the stator core and a motor case fixing part for fixing the motor case to peripheral parts are provided in a portion of the motor case that is positioned on the end wall side of the stator core, and the vibration A stator core assembly for a motor, wherein the reducing means is disposed closer to a contact portion with the stator core than the motor case fixing portion. In the stator core assembly of the motor according to claim 1,
The vibration reducing means is composed of a plurality of through holes that are long in the circumferential direction over the entire outer peripheral side of the end wall of the motor case, and the motor case fixing portion is provided in an inner peripheral side portion of at least one through hole. The stator core assembly of the motor characterized by the above-mentioned. In the stator core assembly of the motor according to claim 2,
The stator core assembly for a motor, wherein the through hole is provided to extend to a peripheral wall of the motor case. In the stator core assembly of the motor according to any one of claims 1 to 3,
A stator core assembly for a motor, wherein a notch is provided over the entire outer peripheral surface of the stator core. In the stator core assembly of the motor according to claim 4,
The stator core is formed by laminating a plurality of annular electromagnetic steel plates along the axial direction of the motor case, and the adjacent electromagnetic steel plates are fixed to each other. A stator core assembly for a motor, wherein a plurality of parts are provided partially over the entire outer peripheral surface of the stator core. In the stator core assembly of the motor according to claim 5,
A stator core assembly for a motor, wherein the number of through holes and the number of cutouts are set to be the same, and the through holes and the cutouts are arranged at the same position in the circumferential direction. In the stator core assembly of the motor according to claim 5,
A stator core assembly for a motor, wherein the number of through holes and the number of notches are set to be the same, and the through holes and the notches are alternately arranged in the circumferential direction.

Images