JP6436065B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine.

  Conventionally, as this kind of rotary electric machine, what is provided with a stator and a rotor is proposed (for example, refer to patent documents 1). The stator includes a stator core having a plurality of teeth and a stator coil wound around each tooth. The rotor is configured as a squirrel-cage rotor and includes a rotor core and a conductor bar embedded in the rotor core and extending in the axial direction. In this rotating electrical machine, the width in the circumferential direction of the teeth is formed to be narrower than the central portion in the axial direction at the end in the axial direction of the teeth of the stator core. Thereby, the width of the end portion in the axial direction of the slot formed between the teeth is widened, and the contact between the stator core and the stator coil in the vicinity of the end portion is suppressed.

JP 2010-124637 A

  By the way, in a rotating electric machine of the type in which a permanent magnet is embedded in the rotor, the width in the circumferential direction of the end portion of the teeth is narrowed in order to suppress contact between the stator core and the stator coil in the vicinity of the end portion. Then, the magnetic flux density is increased at the end of the tooth, and the iron loss is increased. It is desirable to suppress such an increase in iron loss.

  The main purpose of the rotating electrical machine of the present invention is to suppress an increase in iron loss at the ends of the teeth.

  The rotating electrical machine of the present invention employs the following means in order to achieve the main object described above.

The rotating electrical machine of the present invention is
A stator formed by winding a coil around a plurality of teeth;
A rotor core configured to be embedded with a magnet extending in the axial direction, and disposed on the inner peripheral side of the stator and attached to a rotating shaft;
With
A rotating electrical machine in which an end portion in the axial direction of the teeth is formed so that a width in a circumferential direction is smaller than a central portion in the axial direction,
The magnet is embedded in a portion corresponding to the central portion of the teeth of the rotor core in the axial direction, and is not embedded in a portion corresponding to the end portions of the teeth of the rotor core.
This is the gist.

  In the rotating electrical machine of the present invention, the rotor is configured by embedding a magnet extending in the axial direction in the rotor core, and is disposed on the inner peripheral side of the stator and attached to the rotating shaft. The end portion of the stator teeth in the axial direction is formed so that the width in the circumferential direction is smaller than the central portion in the axial direction. In the axial direction, the magnet is embedded in a portion corresponding to the center portion of the teeth of the rotor core, and is not embedded in a portion corresponding to the end portion of the teeth of the rotor core. Thereby, the magnetic flux which goes from the edge part of a tooth to a rotor or a rotor to the edge part of a tooth can be decreased, and the increase in the iron loss in the edge part of a tooth can be suppressed.

It is a block diagram which shows the outline of a structure of the motor 20 as one Example of this invention. It is an enlarged view which expands and shows the part enclosed with the broken line of FIG. It is an external view which shows the external appearance which looked at the motor 20 from the axial direction outer side of FIG. It is an enlarged view which shows the periphery of the teeth 34 in an enlarged manner. FIG. 5 is a schematic view showing an outline of a cross section taken along line AA of FIG.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of a configuration of a motor 20 as an embodiment of the present invention. FIG. 2 is an enlarged view showing a portion surrounded by a broken line in FIG. 3 is an external view showing the external appearance of the motor 20 as viewed from the outside in the axial direction of FIG. In FIG. 3, the coil end 36a of the coil 36 is not shown.

  The motor 20 according to the embodiment is configured as a three-phase AC motor, for example, and includes a stator 30 and a rotor 40 as shown in FIG.

  As shown in FIGS. 1 to 3, the stator 30 is configured by laminating a plurality of stator members formed by punching a non-oriented electrical steel sheet. The stator 30 includes a stator core 32 having a plurality of teeth 34 protruding radially inward (inner peripheral side), and a coil 36 having a coil end 36a wound around the teeth 34 and protruding outward in the axial direction. Prepare. FIG. 4 is an enlarged view showing the periphery of the tooth 34 in an enlarged manner. FIG. 5 is a schematic view showing an outline of a cross section taken along line AA of FIG. As shown in FIGS. 4 and 5, the end portions 34 a and 34 b in the axial direction of the teeth 34 are formed so that the circumferential width Wc is smaller than the central portion 34 c. Thereby, the contact between the coil end 36a and the end portions 34a and 34b is suppressed.

  As shown in FIGS. 1 to 3, the rotor 40 includes a rotor core 42 formed by stacking a plurality of rotor members formed by punching a non-oriented electrical steel sheet into a ring shape, and embedded in the rotor core 42 and extending in the axial direction. A plurality of permanent magnets 44 having an existing shape are attached to the rotary shaft 22 by shrink fitting or spline fitting. The permanent magnet 44 is embedded in a portion corresponding to the central portion 34c of the teeth 34 of the rotor core 42 in the axial direction, and is not embedded in portions corresponding to the end portions 34a and 34b of the teeth 34 of the rotor core 42. Since the permanent magnet 44 is not embedded in the portion corresponding to the end portions 34a and 34b of the teeth 34 of the rotor core 42, the end portions 34a and 34b of the teeth 34 to the rotor core 42 or the rotor core 42 to the end portions 34a and 34b of the teeth 34. The magnetic flux toward is reduced. Therefore, an increase in iron loss at the end portions 34a and 34b of the tooth 34 can be suppressed. Further, in the axial direction of the rotor core 42, reluctance torque can be obtained even in a portion where the permanent magnet 44 is not embedded (portion corresponding to the end portions 34 a and 34 b). Therefore, the torque that can be output from the motor 20 can be further increased.

  According to the motor 20 of the embodiment described above, the permanent magnet 44 is embedded in the portion corresponding to the central portion 34c of the tooth 34 of the rotor core 42 in the axial direction, and corresponds to the end portions 34a and 34b of the tooth 34 of the rotor core 42. By not embedding in the part to perform, the increase in the iron loss in the edge parts 34a and 34b of the teeth 34 can be suppressed.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the teeth 34 correspond to “teeth”, the stator 30 corresponds to “stator”, the permanent magnet 44 corresponds to “magnet”, and the rotor 40 corresponds to “rotor”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the manufacturing industry of rotating electrical machines.

 20 motor, 22 rotating shaft, 30 stator, 32 stator core, 34 teeth, 34a, 34b end, 34c center, 36 coil, 36a coil end, 40 rotor, 42 rotor core, 44 permanent magnet.

Claims (1)

A stator formed by winding a coil around a plurality of teeth;
A rotor core configured to be embedded with a magnet extending in the axial direction, and disposed on the inner peripheral side of the stator and attached to a rotating shaft;
With
A rotating electrical machine in which an end portion in the axial direction of the teeth is formed so that a width in a circumferential direction is smaller than a central portion in the axial direction,
The magnet is embedded in a portion corresponding to the central portion of the teeth of the rotor core in the axial direction, and is not embedded in a portion corresponding to the end portion of the teeth of the rotor core.
Rotating electric machine.

Images