WO2019026173A1

WO2019026173A1 - Motor, and method for manufacturing rotor

Info

Publication number: WO2019026173A1
Application number: PCT/JP2017/027853
Authority: WO
Inventors: 修也福田; 石園　文彦; 増本　浩二; 裕貴田村
Original assignee: 三菱電機株式会社
Priority date: 2017-08-01
Filing date: 2017-08-01
Publication date: 2019-02-07
Also published as: JPWO2019026173A1; CN211377720U; JP6827544B2

Abstract

This invention comprises a rotor, which includes a rotor core and magnets inserted into the rotor core, and a stator provided around the rotor core. The rotor core includes a shaft hole into which a shaft is inserted, and magnet insertion parts into which the magnets are inserted, the magnet insertion parts extending parallel to the direction of the rotation axis of the shaft and having an elongated shape in cross-section orthogonal to the direction of the rotation axis. The magnets include an outer peripheral surface in contact with a magnet insertion part of the rotor core. The magnet insertion parts include a projection projecting towards a magnet, the projection being formed on a longitudinal end part of the magnet insertion part in a cross-section orthogonal to the direction of the rotation axis. The projections include a top part in contact with the outer peripheral surface of a magnet and a set-apart part set apart from the outer peripheral surface of the magnet.

Description

Motor and rotor manufacturing method

The present invention relates to a motor and a method of manufacturing a rotor, and more particularly to a motor including a rotor including a magnet and a method of manufacturing a rotor including a magnet.

A conventional motor comprises a rotatable rotor provided in the shell of the compressor and having a shaft inserted therein, and a stator provided in the shell of the compressor and provided around the rotor A thing is proposed (for example, refer to patent documents 1). The rotor of the motor of Patent Document 1 includes an elongated magnet including a first surface and a second surface opposite to the first surface, and a rotor core in which a magnet insertion portion is formed. There is. The rotor core is configured by stacking a plurality of disk-shaped core pieces. In the magnet insertion portion of the rotor core of the motor of Patent Document 1, a first wall surface in contact with the first surface of the magnet and a second wall surface in contact with the second surface of the magnet and parallel to the first wall surface And are formed. In the technology described in Patent Document 1, the magnet is fixed to the rotor core by being sandwiched between the first wall surface and the second wall surface.

Japanese Patent Laid-Open No. 9-200982

When the rotor is rotating, a force may be applied to the magnet in a direction orthogonal to the axial direction of the rotor and parallel to the first wall surface of the magnet insertion portion. Since this force is a force to shift the position of the magnet, this force is referred to herein as a shift force. When a shift force is applied to the magnet, a frictional force is generated between the magnet and the magnet insertion portion to prevent the position of the magnet from shifting. The frictional force is generated between the first wall surface and the first surface of the magnet and between the second wall surface and the second surface of the magnet. However, it is likely that the friction between the magnet and the magnet insertion portion alone can not prevent the displacement of the magnet.

The present invention has been made to solve the problems as described above, and it is an object of the present invention to provide a motor and a method of manufacturing a rotor capable of more reliably preventing positional deviation of magnets provided in a rotor core. The purpose is.

A motor according to the present invention comprises a rotor including a rotor core and a magnet inserted in the rotor core, and a stator provided around the rotor core, the rotor core having a shaft hole into which the shaft is inserted, and A magnet insertion portion extending in parallel to the rotation axis direction and elongated in a cross section orthogonal to the rotation axis direction, and including a magnet insertion portion in which a magnet is inserted, the magnet being in contact with the magnet insertion portion of the rotor core The magnet insertion portion includes an outer peripheral surface, the magnet insertion portion is formed at an end portion in the longitudinal direction of the magnet insertion portion in a cross section orthogonal to the rotation axis direction, and includes a protrusion protruding toward the magnet. It includes a top in contact with the surface and a standoff spaced from the outer circumferential surface of the magnet.

According to the present invention, the magnet insertion portion is formed at an end portion in the longitudinal direction of the magnet insertion portion in a cross section orthogonal to the rotation axis direction, and includes a projecting portion protruding toward the magnet. For this reason, even if the displacement force is applied to the magnet, the end of the magnet abuts on the protrusion and the movement of the magnet in the direction of the displacement force is restricted. Therefore, according to the present invention, even if a displacement force is applied to the magnet, it is possible to more reliably prevent the displacement of the magnet.

FIG. 1 is a schematic cross-sectional view of a scroll compressor 1 according to a first embodiment. It is an expansion explanatory view of rotor 4a shown in FIG. FIG. 3 is a cross-sectional view taken along the line AA shown in FIG. FIG. 4 is a cross-sectional view taken along the line BB shown in FIG. It is explanatory drawing of the magnet insertion part 4j of core piece 4c1 of 1st group G1 shown in FIG. It is explanatory drawing of the magnet 4d. It is the figure which showed the state in which the magnet 4d was inserted in the magnet insertion part 4j of core piece 4c1. FIG. 8 is an enlarged view of a protrusion tf1 shown in FIG. 7 and the periphery thereof. It is explanatory drawing of core piece 4c2 of 2nd group G2 shown in FIG. It is the figure which showed the state in which the magnet 4d was inserted in the magnet insertion part 4j of core piece 4c2. FIG. 8 is a cross-sectional view of the rotor core 4c taken along the line CC shown in FIG. 7; When shift | offset | difference force F etc. are added to the magnet 4d, it is a schematic diagram which shows a mode that the motion in the magnet insertion part 4j of the magnet 4d is controlled. 6 is a first modification of the scroll compressor 1 according to the first embodiment. 7 is a second modification of the scroll compressor 1 according to the first embodiment. It is the figure which showed the state in which the magnet 4d was inserted in the magnet insertion part 24j of core piece 4c1. FIG. 16 is an enlarged view of a protrusion tf3 shown in FIG. 15 and the periphery thereof. It is explanatory drawing of the magnet insertion part 34j of the core piece 4c1 of 1st group G1. It is explanatory drawing of the magnet 43d. It is the figure which showed the state in which the magnet 43d was inserted in the magnet insertion part 34j of core piece 4c1. FIG. 10 is a cross-sectional view of a rotor core 4c of a scroll compressor according to Embodiment 4. It is structure explanatory drawing of 1st end side magnet piece Dv2. A state is shown in which the central magnet piece Dv1 is inserted into the magnet insertion portion 44j. A state in which the first end magnet piece Dv2 is inserted into the magnet insertion portion 44j is shown. A state in which the second end magnet piece Dv3 is inserted into the magnet insertion portion 44j is shown. FIG. 20 is a cross-sectional view of a rotor core 4c of a scroll compressor according to Embodiment 5. It is structure explanatory drawing of center magnet piece Dv11. A state in which the first end magnet piece Dv12 is inserted into the magnet insertion portion 45j is shown. A state in which the second end magnet piece Dv13 is inserted into the magnet insertion portion 45j is shown. It shows a state in which the central magnet piece Dv11 is inserted into the magnet insertion portion 45j.

Embodiment 1
Hereinafter, embodiments will be described with reference to the drawings as appropriate. In addition, in the following drawings including FIG. 1, the relationship of the magnitude | size of each structural member may differ from an actual thing.

<Configuration of Embodiment 1>
FIG. 1 is a schematic cross-sectional view of the scroll compressor 1 according to the first embodiment. The scroll compressor 1 compresses the refrigerant to a high temperature and a high pressure. The scroll compressor 1 constitutes an outer shell of the scroll compressor 1 and is provided with a shell 2 having an oil reservoir 3a at its lower portion, and an oil pump 3 housed in the shell 2 and sucking up oil from the oil reservoir 3a And a motor 4 including a stator 4b fixed to the shell 2 and a rotor 4a provided on the The scroll compressor 1 further includes a compression unit 5 including a fixed scroll 30 and a swing scroll 40, a frame 6 accommodating the swing scroll 40, and a shaft 7 fixed to the rotor 4a. . The scroll compressor 1 further includes a suction pipe 11 for guiding the refrigerant into the shell 2 and a discharge pipe 12 for guiding the refrigerant compressed by the compression unit 5 from the inside of the shell 2 to the outside of the shell 2.

The scroll compressor 1 includes a discharge chamber 13 provided on the fixed scroll 30, a valve 13A provided on the discharge chamber 13, and a muffler 14 provided on the discharge chamber 13. The scroll compressor 1 also includes an Oldham ring 15 for restricting the oscillating scroll 40 to rotate, a cylindrical slider 16 provided at the upper end of the shaft 7, and a main provided at the frame 6. A bearing 8 a and a sleeve 17 provided between the main bearing 8 a and the shaft 7 are provided. Furthermore, the scroll compressor 1 includes a first balancer 18 provided on the shaft 7, a sub-frame 20 fixed to the lower part of the shell 2, a sub bearing 8b provided on the sub-frame 20, and a frame 6 and an oil discharge pipe 21 for discharging excess oil.

The shell 2 includes a cylindrical body 2A, a dome-shaped upper shell 2a provided at the upper end of the body 2A, and a dome-shaped lower shell 2b provided at the lower end of the body 2A. ing. The oil pump 3 supplies the oil sucked from the oil reservoir 3 a to an oil passage 7 a formed in the shaft 7. The motor 4 rotates the shaft 7. The motor 4 is provided below the compression unit 5 and above the sub-frame 20. Electric power is supplied to the stator 4 b of the motor 4 from an inverter (not shown). The rotor 4a rotates as power is supplied to the stator 4b. The compression unit 5 compresses the refrigerant. The fixed scroll 30 is fixed to the body 2A of the shell 2. A discharge chamber 13 is provided on the fixed scroll 30. The rocking scroll 40 has a hollow cylindrical boss 40a into which the upper end of the shaft 7 is inserted. A rocking bearing 8c is provided on the inner peripheral portion of the boss 40a. The rocking scroll 40 performs a rocking operation by rotation of the shaft 7. The fixed scroll 30 is provided with a spiral wrap 31, and the oscillating scroll 40 is provided with a spiral wrap 41 for compressing the refrigerant together with the wrap 31. In a space between the wrap portion 31 and the wrap portion 41, a compression chamber 5a in which the refrigerant is compressed is formed. The fixed scroll 30 is formed with a discharge port 30a through which the refrigerant compressed in the compression chamber 5a passes.

The frame 6 is fixed to the shell 2. The frame 6 supports the shaft 7 via the main bearing 8a. Further, the frame 6 supports the oscillating scroll 40. The frame 6 is formed with a suction port 6 a for guiding the refrigerant located below the frame 6 to the compression chamber 5 a. Further, in the frame 6, an Oldham space 15b in which an Oldham ring 15 is provided is formed. Further, a concave space 6 d in which the boss 40 a is disposed is formed in the frame 6. Further, the frame 6 is provided with a thrust bearing 6b on which the oscillating scroll 40 slides. The shaft 7 transmits the rotational force of the rotor 4 a to the oscillating scroll 40. The shaft 7 is rotatably supported by the main bearing 8a and the auxiliary bearing 8b. The suction pipe 11 is provided on the body 2 A of the shell 2, and the discharge pipe 12 is provided on the upper shell 2 a of the shell 2. The discharge chamber 13 is formed with a space 13a into which the refrigerant that has passed through the discharge port 30a of the fixed scroll 30 flows, and a discharge port 13b which communicates with the space 13a and is closed by the valve 13A. When the pressure in the space 13a becomes higher than a predetermined pressure, the valve 13A separates from the discharge port 13b. The muffler 14 suppresses the pulsation of the refrigerant discharged from the discharge chamber 13.

The slider 16 is provided between the oscillating scroll 40 and the upper end of the shaft 7. The slider 16 is provided inside the swing bearing 8c. The first balancer 18 is provided between the frame 6 and the rotor 4a. The first balancer 18 is housed in the cover 18a. The sub-frame 20 supports the shaft 7 via the auxiliary bearing 8b. The upper end of the oil discharge pipe 21 is provided in the Oldham space 15b of the frame 6, and the lower end of the oil discharge pipe 21 is provided along the circumferential surface of the body 2A.

FIG. 2 is an enlarged explanatory view of the rotor 4a shown in FIG. FIG. 3 is a cross-sectional view taken along line AA shown in FIG. FIG. 4 is a cross-sectional view taken along the line BB shown in FIG. As shown in FIG. 2, the rotor 4a has a cylindrical rotor core 4c, a first end plate 4e provided on one end surface of the rotor core 4c, and a second end provided on the other end surface of the rotor core 4c. A plate 4f and a second balancer 4g provided on the second end plate 4f are provided. Further, the rotor 4a includes a rivet 4h1 inserted in the first end plate 4e, the rotor core 4c and the second end plate 4f, a first end plate 4e, a rotor core 4c, a second end plate 4f and a second And a rivet 4h2 inserted into the balancer 4g. As shown in FIG. 4, the rotor core 4 c is configured by stacking a plurality of core pieces. That is, the rotor core 4c includes a plurality of core pieces 4c1 belonging to the first group G1, a plurality of core pieces 4c2 belonging to the second group G2, and a plurality of core pieces 4c3 belonging to the third group G3. There is. The core piece 4c1, the core piece 4c2, and the core piece 4c3 have a disk shape. The core piece 4c1 belonging to the first group G1 corresponds to the first core piece, the core piece 4c3 belonging to the third group G3 corresponds to the second core piece, and the core piece 4c2 belongs to the second group G2 Corresponds to the third core piece. The shape of the core piece 4c1 is the same as the shape of the core piece 4c3, but the shape of the core piece 4c1 is different from the shape of the core piece 4c2. The second group G2 is disposed between the first group G1 and the third group G3. As shown in FIG. 2, a shaft hole 4i into which the shaft 7 is inserted is formed at the central portion of the rotor core 4c. The rotational axis direction Dr1 of the shaft 7 is parallel to the direction in which the core pieces of the rotor core 4c are stacked. Further, as shown in FIGS. 3 and 4, the rotor core 4c is formed with a magnet insertion portion 4j extending in parallel to the rotation axis direction Dr1. The magnet insertion portion 4j is formed in a long shape in a cross section orthogonal to the rotation axis direction Dr1. The magnet insertion portion 4j is formed with a through hole into which the magnet 4d is inserted. Six magnet insertion parts 4j are formed in the rotor core 4c. The two adjacent magnet insertion parts 4j are disposed at an angle of 60 degrees with respect to the center of the rotor core 4c. Further, as shown in FIGS. 3 and 4, a plurality of through holes 4L are formed on the outer peripheral surface side of the position where the magnet insertion portion 4j is formed in the rotor core 4c.

The first end plate 4e and the second end plate 4f prevent the magnet 4d from jumping out of the magnet insertion portion 4j. A shaft hole 4e1 into which the shaft 7 is inserted is formed at the center of the first end plate 4e, and a shaft hole 4e1 into which the shaft 7 is inserted is also formed at the center of the second end plate 4f. The rivet 4h1 is a member for attaching the first end plate 4e and the second end plate 4f to the rotor core 4c. The rivet 4h2 is a member for attaching the first end plate 4e and the second end plate 4f to the rotor core 4c and attaching the second balancer 4g to the second end plate 4f. The second balancer 4 g secures the balance of the shaft 7, the rotor 4 a and the oscillating scroll 40 when the shaft 7, the rotor 4 a and the oscillating scroll 40 are moving.

FIG. 5 is an explanatory view of the magnet insertion portion 4j of the core piece 4c1 of the first group G1 shown in FIG. FIG. 6 is an explanatory view of the magnet 4 d. FIG. 7 is a view showing a state in which the magnet 4 d is inserted into the magnet insertion portion 4 j of the core piece 4 c 1. FIG. 8 is an enlarged view of the protrusion tf1 shown in FIG. 7 and the periphery thereof. The direction Dr2 is a longitudinal direction of the magnet insertion portion 4j when the magnet insertion portion 4j is viewed in a cross section orthogonal to the rotation axis direction Dr1. The configuration of the magnet 4d and the configuration of the core piece 4c1 will be described on the basis of FIGS. 5 to 8 and FIGS. 2 to 4 described above. The core piece 4c3 has the same shape as the core piece 4c1, and therefore the description thereof is omitted.

As shown in FIG. 6, the magnet 4d includes an outer circumferential surface 4D in contact with the magnet insertion portion 4j of the rotor core 4c. The outer peripheral surface 4D includes an inner side surface SF1 which is a plane formed on the shaft hole 4i side, and an outer side surface SF2 which is a plane parallel to the inner side surface SF1. Here, as shown in FIGS. 3 and 6, the distance from the outer side surface SF2 to the shaft hole 4i is longer than the distance from the inner side surface SF1 to the shaft hole 4i. In addition, as shown in FIGS. 4 and 6, the outer peripheral surface 4D has a first contact surface sf1 provided at a first end 4d1 extending in parallel to the rotation axis direction Dr1, and a first end And a second contact surface sf2 provided at a second end 4d2 extending parallel to the portion 4d1. The first end 4d1 is one end in the direction Dr2 of the inner surface SF1 and the second end 4d2 is the other end in the direction Dr2 of the inner surface SF1. The first contact surface sf1 and the second contact surface sf2 have the same shape, and the first contact surface sf1 and the second contact surface sf2 are flat. Furthermore, as shown in FIG. 6, the outer peripheral surface 4D is provided at one end in the direction Dr2 of the outer surface SF2, and is provided at the end face SF3 orthogonal to the outer surface SF2 and the other end in the direction Dr2 of the outer surface SF2. , And an end face SF4 orthogonal to the outer side face SF2. The end face SF3 and the end face SF4 have the same shape, and the end face SF3 and the end face SF4 are flat.

As shown in FIGS. 5 and 7, in the magnet insertion portion 4j, a first surface TF1 facing the inner surface SF1 of the magnet 4d with a gap in between and a second surface TF1 contacting the outer surface SF2 of the magnet 4d. And a surface TF2. The first surface TF1 and the second surface TF2 are planar. Further, as shown in FIGS. 3 and 5, the magnet insertion portion 4j has a protrusion tf1 formed at one end of the magnet insertion portion 4j in the longitudinal direction in a cross section orthogonal to the rotation axis direction Dr1, and the rotation axis direction And a protrusion tf2 formed at the other end in the longitudinal direction of the magnet insertion portion 4j in a cross section orthogonal to the Dr1. The protrusion tf1 protrudes toward the first contact surface sf1, and the protrusion tf2 protrudes toward the second contact surface sf2. As shown in FIGS. 5 to 7, the protrusion tf1 is provided on the first end 4d1 side of the inner side surface SF1, and the protrusion tf2 is provided on the second end 4d2 side of the inner side surface SF1. One of the protrusion tf1 and the protrusion tf2 corresponds to the first protrusion, and the other corresponds to the second protrusion.

Here, the arrangement of the protrusions tf1 and the protrusions tf2 is symmetrical, but the shape of the protrusions tf1 and the shape of the protrusions tf2 are the same. Therefore, the shape of the protrusion tf1 will be mainly described here. As shown in FIG. 8, the protrusion tf1 has a top portion tfa in contact with the first contact surface sf1 of the magnet 4d, a separated portion tfb spaced from the first contact surface sf1 of the magnet 4d, and the magnet And a separation portion tfc which is separated from the first contact surface sf1 of 4d. The top tfa is sandwiched between the separation part tfb and the separation part tfc. Although not shown, the protrusion tf2 has the same shape as the protrusion tf1. That is, the protrusion tf2 is separated from the top tfa in contact with the second contact surface sf2, the separation tfb apart from the second contact surface sf2, and the separation from the second contact surface sf2 And tFC.

FIG. 9 is an explanatory view of the core piece 4c2 of the second group G2 shown in FIG. FIG. 10 is a view showing a state in which the magnet 4 d is inserted into the magnet insertion portion 4 j of the core piece 4 c 2. FIG. 11 is a cross-sectional view when the rotor core 4c is viewed in the CC cross section shown in FIG. Next, the configuration of the core piece 4c2 will be described. The shape of the core piece 4c2 is different from the shape of the core piece 4c1 in the point to be described next, but is otherwise the same. The protrusion tf1 and the protrusion tf2 described above are not formed on the core piece 4c2. That is, as shown in FIGS. 9 and 10, the magnet insertion portion 4j contacts the inner circumferential surface TF3 facing each other without contacting the first contact surface sf1 of the magnet 4d and the second contact surface sf2 of the magnet 4d. The inner surface TF4 facing each other is formed. As shown in FIG. 11, the inner circumferential surface TF3 is provided between the protrusion tf1 of the core piece 4c1 and the protrusion tf1 of the core piece 4c3. Further, the inner peripheral surface TF4 is provided between the protrusion tf2 of the core piece 4c1 and the protrusion tf2 of the core piece 4c3.

As shown in FIG. 11, although the first contact surface sf1 of the magnet 4d is in contact with the protrusion tf1 of the core piece 4c1 of the first group G1 and the protrusion tf1 of the core piece 4c3 of the third group G3. , And the core piece 4c2 of the second group G2 are not in contact. That is, as shown in FIGS. 10 and 11, a gap 4Q is formed between the core piece 4c2 of the second group G2 and the first contact surface sf1. The second contact surface sf2 of the magnet 4d is in contact with the projection tf2 of the core piece 4c1 of the first group G1 and the projection tf2 of the core piece 4c3 of the third group G3, but the second group There is no contact with the core piece 4c2 of G2. That is, a gap 4Q is formed between the core piece 4c2 of the second group G2 and the second contact surface sf2.

Further, the shape of the magnet 4d will be described based on FIG. As shown in FIG. 11, the magnet 4d has an end 4dt whose width parallel to the direction Dr2 is tapered. The magnet 4d is inserted into the magnet insertion portion 4j of the rotor core 4c, while the end 4dt is a portion of the magnet 4d that is first inserted into the magnet insertion portion 4j.

<Operation of Embodiment 1>
The operation of the scroll compressor 1 will be described based on FIG. 1 described above. When the stator 4b receives supply of power from an inverter (not shown), the rotor 4a rotates. As the rotor 4a rotates, the shaft 7 rotates. As the shaft 7 rotates, the oil of the oil reservoir 3 a is pulled up by the oil pump 3 and flows into the oil passage 7 a of the shaft 7. The oil that has flowed into the oil passage 7a is supplied to the space 6d formed in the frame 6 after lubricating the rocking bearing 8c. The oil in the space 6d is supplied to the oldham space 15b while lubricating the thrust bearing 6b. The oil supplied to the Oldham space 15 b lubricates the Oldham ring 15. Further, the oil supplied to the Oldham space 15b returns to the oil reservoir 3a through the oil drainage pipe 21.

The refrigerant flows from the suction pipe 11 into the shell 2. The refrigerant flowing into the shell 2 flows into the compression chamber 5 a through the suction port 6 a of the frame 6. Here, as the rotor 4a rotates, the oscillating scroll 40 oscillates. As the oscillating scroll 40 oscillates, the refrigerant is compressed in the compression chamber 5a. The refrigerant compressed in the compression chamber 5 a flows to the discharge pipe 12 through the discharge port 30 a of the fixed scroll 30, the discharge port 13 b of the discharge chamber 13, and the muffler 14.

FIG. 12 is a schematic view showing how the movement of the magnet 4d is restricted when the shift force F or the like is applied to the magnet 4d. The force that causes the positional displacement of the magnet 4d, such as the displacement force F, occurs when the rotor 4a is rotating. Here, the direction of the shift force F is parallel to the direction from the protrusion tf2 to the protrusion tf1. When the shift force F is applied to the magnet 4d, the magnet 4d receives the reaction force f from the protrusion tf1 because the magnet 4d is in contact with the protrusion tf1. The component fx parallel to the direction Dr2 of the reaction force f is equal to the displacement force F. That is, even if the shift force F is applied to the magnet 4d, the magnet 4d is restricted from moving in the direction of the shift force F because the first contact surface sf1 of the magnet 4d receives the reaction force f from the protrusion tf1. The component fy orthogonal to the direction Dr2 of the reaction force f acts to press the outer surface SF2 of the magnet 4d against the second surface TF2.

Although illustration is omitted, when the direction of the shift force is parallel to the direction from the protrusion tf1 to the protrusion tf2, the magnet 4d strikes the protrusion tf2, and the magnet 4d receives the reaction force f from the protrusion tf2. The movement of the magnet 4d is restricted.

In addition, even if the shift force F2 is applied to the rotor 4a, the magnet 4d abuts on the protrusion tf1 and the protrusion tf2, so that the magnet 4d is restricted from moving in the direction of the shift force F2. The direction of the shift force F2 is the direction from the first surface TF1 to the second surface TF2. Furthermore, even if the shift force F3 is applied to the rotor 4a, since the magnet 4d abuts on the second surface TF2, movement of the magnet 4d in the direction of the shift force F3 is restricted. The direction of the shift force F3 is the opposite direction to the direction of the shift force F2.

<Effect of Embodiment 1>
The magnet insertion part 4j is formed at an end of the magnet insertion part 4j in the longitudinal direction in a cross section orthogonal to the rotation axis direction Dr1, and includes a projection part tf1 projecting toward the magnet 4d. Therefore, even if the shift force F is applied to the magnet 4d, the magnet 4d receives the reaction force f from the projection tf1, and the movement of the magnet 4d in the direction of the shift force F is restricted. Therefore, when the rotor 4a is rotating, the positional deviation of the magnet 4d is more reliably prevented. Further, since the positional deviation of the magnet 4d is more reliably prevented, it is possible to prevent the collision of the magnet 4d and the inner peripheral surface of the magnet insertion portion 4j when the rotor 4a is rotating. As a result, damage to the magnet 4 d and the rotor 4 a and noise generation due to collision between the magnet 4 d and the inner peripheral surface of the magnet insertion portion 4 j are suppressed.

The protrusion tf1 includes a top tfa, a separation part tfb and a separation part tfc. Since the top part tfa contacts the magnet 4d, the separation part tfb and the separation part tfc do not contact the magnet 4d, so the contact area of the core piece 4c1 with the magnet 4d is suppressed. Thus, it is possible to suppress the friction between the outer peripheral surface 4D of the magnet 4d and the inner peripheral surface of the magnet insertion portion 4j when the magnet 4d is press-fitted into the magnet insertion portion 4j. Therefore, the work load when pressing the magnet 4d into the magnet insertion portion 4j is suppressed.

The magnet insertion portion 4j includes a protrusion tf2 having a configuration similar to that of the protrusion tf1, in addition to the protrusion tf1. Therefore, the effect of preventing the positional deviation of the magnet 4d described above, the effect of preventing the collision between the magnet 4d and the inner circumferential surface of the magnet insertion portion 4j, and the press-fitting of the magnet 4d into the magnet insertion portion 4j The effect of reducing the work load when doing is further improved.

The core piece 4c2 of the second group Gr2 includes an inner circumferential surface TF3 spaced from the outer circumferential surface 4D of the magnet 4d and an inner circumferential surface TF4 spaced from the outer circumferential surface 4D of the magnet 4d. For this reason, the core piece 4c2 is reduced in contact area with the magnet 4d by the inner circumferential surface TF3 and the inner circumferential surface TF4. Thus, it is possible to suppress the friction between the outer peripheral surface 4D of the magnet 4d and the core piece 4c2 when the magnet 4d is pressed into the magnet insertion portion 4j. Therefore, the work load when pressing the magnet 4d into the magnet insertion portion 4j is suppressed.

The refrigerant has larger magnetic resistance than iron or the like that constitutes the rotor core 4c. For this reason, the magnetic flux of the magnet 4d does not easily pass through the refrigerant. Here, the outer surface SF2 of the magnet 4d and the second surface TF2 of the magnet insertion portion 4j are in contact with each other. Thus, the refrigerant does not flow between the outer surface SF2 and the second surface TF2. As a result, in the area around the magnet 4d, the portion where the magnetic flux of the magnet 4d is difficult to pass is reduced. Therefore, the motor 4 is prevented from lowering its operating efficiency.

In the description of the first embodiment, the form of the rotor core 4c having the core piece 4c2 different in shape from the core piece 4c1 has been described, but the present invention is not limited to this form. That is, the shape of all the core pieces provided in the rotor core 4c may be the same as the shape of the core piece 4c1. Further, in the description of the first embodiment, the mode in which the motor 4 is applied to the scroll compressor 1 has been described, but the present invention is not limited to this mode. The motor 4 may be applied to an object other than a compressor.

<Modification 1>
FIG. 13 is a first modification of the scroll compressor 1 according to the first embodiment. Although the embodiment in which the protrusion tf1 is formed to have a curved surface is described in the first embodiment, the present invention is not limited to this embodiment. As shown in FIG. 13, the separation part tfb and the separation part tfc may be flat. Thus, the top tfa of the first modification becomes sharper than the top tfa of the first embodiment. As a result, the contact area between the projection tf10 of the first modification and the magnet 4d is smaller than the contact area between the projection tf1 of the first embodiment and the magnet 4d. Even in the first modification, the same effect as that of the first embodiment can be obtained.

<Modification 2>
FIG. 14 is a second modification of the scroll compressor 1 according to the first embodiment. In the first embodiment, protrusion tf1 is formed at one end in the longitudinal direction of magnet insertion portion 4j in a cross section orthogonal to rotation axis direction Dr1, and protrusion tf2 is a cross section orthogonal to rotation axis direction Dr1 in magnet insertion portion 4j. It was formed at the other end in the longitudinal direction. However, it is not limited to this form. In the second modification, a protrusion tf1 is formed at one end in the longitudinal direction of the magnet insertion portion 4j in a cross section orthogonal to the rotation axis direction Dr1. On the other hand, a support surface tf20 is formed at the other end in the longitudinal direction of the magnet insertion portion 4j in the cross section orthogonal to the rotation axis direction Dr1 instead of the protrusion tf2. The support surface tf20 is in contact with the second contact surface sf2 of the magnet 4d. The support surface tf20 may not project toward the second contact surface sf2. Even in the second modification, the same effect as that of the first embodiment can be obtained.

Second Embodiment
In the second embodiment, parts common to the first embodiment are assigned the same reference numerals and explanations thereof will be omitted, and differences from the first embodiment will be mainly described. In the first embodiment, the end of the inner side surface SF1 of the magnet 4d is in contact with the magnet insertion portion 4j. On the other hand, in the second embodiment, the end of the outer surface SF2 of the magnet 42d is in contact with the magnet insertion portion 24j. FIG. 15 is a view showing a state in which the magnet 4d is inserted into the magnet insertion portion 24j of the core piece 4c1. FIG. 16 is an enlarged view of the protrusion tf3 shown in FIG. 15 and the periphery thereof. Since the core piece 4c3 has the same shape as the core piece 4c1, the description of the core piece 4c3 is omitted in the embodiment.

<Configuration of Embodiment 2>
An outer circumferential surface 42D of the magnet 42d is provided with a third contact surface sf3 provided at a third end 4d3 extending parallel to the rotation axis direction Dr1 and a third contact surface sf3 extending parallel to the third end 4d3. And a fourth contact surface sf4 provided at the end 4d4 of the fourth part. The third end 4d3 is an end in the direction Dr2 of the outer surface SF2, and the fourth end 4d4 is the other end in the direction Dr2 of the outer surface SF2. The third contact surface sf3 and the fourth contact surface sf4 have the same shape, and the third contact surface sf3 and the fourth contact surface sf4 are flat. Further, as shown in FIG. 15, the outer peripheral surface 42D includes an end face SF5 provided at one end in the direction Dr2 of the inner side face SF1 and an end face SF6 provided at the other end in the direction Dr2 of the inner side face SF1. Contains. The end face SF5 and the end face SF6 have the same shape, and the end face SF5 and the end face SF6 are flat. The first surface TF1 is in contact with the inner surface SF1, and the second surface TF2 faces the outer surface SF2 with a gap.

The magnet insertion portion 24j has a protrusion tf3 formed at one end in the longitudinal direction of the magnet insertion portion 24j in a cross section orthogonal to the rotation axis direction Dr1, and a magnet insertion portion 24j in a cross section orthogonal to the rotation axis direction Dr1. And a projection tf4 formed at the other end in the longitudinal direction. The protrusion tf3 protrudes toward the third contact surface sf3, and the protrusion tf4 protrudes toward the fourth contact surface sf4. The protrusion tf3 is provided on the side of the third end 4d3 of the outer surface SF2, and the protrusion tf4 is provided on the side of the fourth end 4d4 of the outer surface SF2. Although the arrangement of the protrusions tf3 and the protrusions tf4 is symmetrical, the shape of the protrusions tf3 and the shape of the protrusions tf4 are the same. Therefore, the shape of the protrusion tf3 will be mainly described here. One of the protrusion tf3 and the protrusion tf4 corresponds to the third protrusion, and the other corresponds to the fourth protrusion.

As shown in FIG. 16, the protrusion tf3 has a top portion tfa in contact with the third contact surface sf3 of the magnet 42d, a separated portion tfb spaced from the third contact surface sf3 of the magnet 42d, and the magnet And a separation portion tfc separated from the third contact surface sf3 of 42d. Although not shown, the protrusion tf4 also has the same shape as the protrusion tf3. That is, the protrusion tf4 is separated from the top tfa in contact with the fourth contact surface sf4, the separation portion tfb apart from the fourth contact surface sf4, and the separation from the fourth contact surface sf4. And tFC.

Although illustration is omitted, the shape of the core piece 4c2 is the same as the core piece 4c1 except that the above-mentioned protrusion tf3 and the protrusion tf4 are not formed.

<Effect of Second Embodiment>
The second embodiment also has the same effect as the first embodiment.

The protrusion tf3 and the protrusion tf4 may be in the form as in the first modification of the first embodiment.

Third Embodiment
In the third embodiment, parts common to the first and second embodiments are assigned the same reference numerals and explanations thereof will be omitted, and differences from the first and second embodiments will be mainly described. The third embodiment is a combination of the first embodiment and the second embodiment. FIG. 17 is an explanatory view of the magnet insertion portion 34j of the core piece 4c1 of the first group G1. FIG. 18 is an explanatory view of the magnet 43 d. FIG. 19 is a view showing a state in which the magnet 43d is inserted into the magnet insertion portion 34j of the core piece 4c1.

<Configuration of Embodiment 3>
The outer peripheral surface 43D of the magnet 43d has the first contact surface sf1 described in the first embodiment, the second contact surface sf2 described in the first embodiment, and the third contact surface described in the second embodiment. and sf3 and the fourth contact surface sf4 described in the second embodiment. The outer peripheral surface 43D of the magnet 43d is an end face SF7 formed from the end of the first contact surface sf1 to the end of the third contact surface sf3, and the fourth contact surface from the end of the second contact surface sf2 and an end face SF8 formed to the end of sf4. The end face SF7 and the end face SF8 have the same shape, and the end face SF7 and the end face SF8 are flat. The first surface TF1 faces the inner surface SF1 with a gap, and the second surface TF2 also faces the outer surface SF2 with a gap.

<Effect of Embodiment 3>
The third embodiment also has the following effect in addition to the same effect as the first embodiment. In the third embodiment, the first surface TF1 and the second surface TF2 are not in contact with the magnet insertion portion 34j. Therefore, the contact area between the magnet 43d and the magnet insertion portion 34j is further reduced. Therefore, the work load when pressing the magnet 43d into the magnet insertion portion 34j is further suppressed.

The protruding portion tf1, the protruding portion tf2, the protruding portion tf3, and the protruding portion tf4 may have a form as in the first modification of the first embodiment.

Fourth Embodiment
In the fourth embodiment, parts common to the first to third embodiments are assigned the same reference numerals and explanations thereof will be omitted, and differences from the first to third embodiments will be mainly described.

<Configuration of Fourth Embodiment>
FIG. 20 is a cross-sectional view of a rotor core 4c of a scroll compressor according to a fourth embodiment. FIG. 21 is a configuration explanatory view of the first end side magnet segment Dv2. As shown in FIG. 20, the configuration of all the core pieces of the rotor core 4c of the fourth embodiment is the same as the configuration of the core piece 4c1 described in the first embodiment. Moreover, the magnet 44d is a split type. That is, as shown in FIGS. 20 and 21, the magnet 44d is provided with the elongated central magnet piece Dv1 and the elongated first end side including the end portion Dvt2 tapered in the thickness direction. A magnet piece Dv2 and a second end magnet piece Dv3 having the same shape as the first end magnet piece Dv2 are included.

<Manufacturing Method of Fourth Embodiment>
FIG. 22 shows how the central magnet piece Dv1 is inserted into the magnet insertion portion 44j. FIG. 23 shows how the first end magnet piece Dv2 is inserted into the magnet insertion portion 44j. FIG. 24 shows how the second end magnet piece Dv3 is inserted into the magnet insertion portion 44j. First, a plurality of core pieces 4c1 are stacked to produce a rotor core 4c. The rotor core 4c is provided with a magnet insertion portion 44j into which the magnet 44d is inserted. Next, the central magnet segment Dv1, the first end magnet segment Dv2, and the second end magnet segment Dv3 are prepared. Then, as shown in FIG. 22, the central magnet segment Dv1 is inserted into the magnet insertion portion 44j, and is pressed into the magnet insertion portion 44j. Subsequently, as shown in FIG. 23, the tapered end Dvt2 of the first end magnet piece Dv2 is inserted into the gap Sr1. The gap Sr1 is formed between one end of the central magnet piece Dv1 and the inner circumferential surface of the magnet insertion portion 44j. Then, the first end magnet piece Dv2 is pressed into the gap Sr1. Furthermore, as shown in FIG. 24, the tapered end Dvt3 of the second end-side magnet piece Dv3 is inserted into the gap Sr2. The gap Sr2 is formed between the other end of the central magnet piece Dv1 and the inner circumferential surface of the magnet insertion portion 44j. Then, the second end magnet piece Dv3 is pressed into the gap Sr2.

<Effect of Fourth Embodiment>
The stator generates magnetism when power is supplied to the stator. Interaction between the magnetism of the rotor magnet and the magnetism of the stator causes the rotor to rotate. The magnetism generated by the stator passes through the magnets of the rotor. Therefore, eddy currents are generated in the magnets of the rotor. When an eddy current is generated in the magnet of the rotor, the magnet generates heat to demagnetize the magnet, which lowers the operation efficiency of the motor. Here, the magnitude of the eddy current increases in proportion to the increase of the surface area of the rotor magnet. In the fourth embodiment, since the magnet 44d is divided into three, the surface area of each magnet can be suppressed. That is, the surface area of the central magnet segment Dv1 is smaller than the surface area of the magnet 44d when the magnet 44d is not divided. The surface area of the first end magnet piece Dv2 and the surface area of the second end magnet piece Dv3 are the same. Therefore, the eddy current generated in the central magnet piece Dv1 is smaller than the eddy current generated in the magnet 44d if the magnet 44d is not divided. The same applies to the eddy current generated in the first end magnet piece Dv2 and the eddy current generated in the second end magnet piece Dv3. Thus, in the fourth embodiment, since the eddy current generated in the central magnet segment Dv1 can be suppressed, the heat generation of the central magnet segment Dv1 can be suppressed. Further, since the eddy current generated in the first end magnet piece Dv2 can be suppressed, the heat generation of the first end magnet piece Dv2 can be suppressed. Furthermore, since the eddy current generated in the second end magnet piece Dv3 can be suppressed, the heat generation of the second end magnet piece Dv3 can be suppressed. Therefore, in the fourth embodiment, since the heat generation of each magnet can be suppressed, it is possible to suppress the decrease in the driving efficiency of the motor. Although the magnet 44 d is divided into three in the fourth embodiment, the same effect can be obtained whether the magnet 44 d is divided into two or four or more. That is, even if the magnet 44d is divided into two or four or more, heat generation of each magnet can be suppressed, and a reduction in the operating efficiency of the motor can be suppressed.

When the first end magnet piece Dv2 is press-fitted, not only the friction with the magnet insertion portion 44j but also the friction with the central magnet piece Dv1 occurs in the first end magnet piece Dv2. For this reason, the work load at the time of press-fitting 1st end side magnet piece Dv2 tends to increase. However, the end Dvt2 of the first end magnet piece Dv2 is tapered in the thickness direction. Therefore, the work load when press-fitting the first end-side magnet segment Dv2 into the gap Sr1 can be suppressed. In addition, since the end Dvt3 of the second end magnet piece Dv3 is also tapered in the thickness direction, it is possible to suppress the work load when the second end magnet piece Dv3 is press-fit into the gap Sr2. .

Embodiment 5
In the fifth embodiment, the parts common to the first to fourth embodiments are assigned the same reference numerals and explanation thereof is omitted, and differences from the first to fourth embodiments will be mainly described.

<Configuration of Fifth Embodiment>
FIG. 25 is a cross-sectional view of a rotor core 4c of a scroll compressor according to a fifth embodiment. FIG. 26 is a configuration explanatory view of the central magnet segment Dv11. As shown in FIG. 25, the configuration of all the core pieces of the rotor core 4c of the fifth embodiment is the same as the configuration of the core piece 4c1 described in the first embodiment. Moreover, the magnet 45d is divided into three. That is, as shown in FIG. 25 and FIG. 26, the magnet 45d has a tapered first end magnet piece Dv12, a long second magnet piece Dv13, and a Dr2 width. And an elongated central magnet piece Dv11 having an end Dvt11. The Dr2 direction is a direction orthogonal to the thickness direction of the magnet 45d.

<Manufacturing Method of Fifth Embodiment>
FIG. 27 shows how the first end magnet piece Dv12 is inserted into the magnet insertion portion 45j. FIG. 28 shows how the second end magnet piece Dv13 is inserted into the magnet insertion portion 45j. FIG. 29 shows how the central magnet piece Dv11 is inserted into the magnet insertion portion 45j. First, a plurality of core pieces 4c1 are stacked to produce a rotor core 4c. The rotor core 4c is provided with a magnet insertion portion 44j into which the magnet 44d is inserted. Next, the first end magnet piece Dv12, the second end magnet piece Dv13, and the central magnet piece Dv11 are prepared. As shown in FIG. 27, the end of the first end magnet piece Dv12 is inserted into the magnet insertion portion 45j. Then, the first end magnet piece Dv12 is pressed into the magnet insertion portion 45j. Subsequently, as shown in FIG. 28, the end of the second end magnet piece Dv13 is separated by a predetermined distance Ds between the first end magnet piece Dv12 and the second end magnet piece Dv13. Then, insert it into the magnet insertion part 45j. Then, the second end magnet piece Dv13 is press-fitted into the magnet insertion portion 45j. The distance Ds is set to be narrower than the width dimension in the direction parallel to the direction Dr2 of the central magnet segment Dv11. Furthermore, as shown in FIG. 29, the tapered end Dvt11 of the central magnet piece Dv11 is inserted between the first end magnet piece Dv12 and the second end magnet piece Dv13. Then, the central magnet piece Dv11 is pressed into the magnet insertion portion 45j.

<Effect of Fifth Embodiment>
In the fifth embodiment, since the magnet 45d is divided into three as in the fourth embodiment, the same effect as that of the fourth embodiment can be obtained. That is, since the heat generation of each magnet can be suppressed, it is possible to suppress the decrease in the driving efficiency of the motor.

When the central magnet piece Dv11 is press-fitted, not only the friction with the magnet insertion portion 45j but also the friction with the first end side magnet piece Dv12 and the second end side magnet piece Dv13 occurs in the central magnet piece Dv11. For this reason, the work load at the time of press-fitting central magnet piece Dv11 tends to increase. However, the end Dvt11 of the central magnet piece Dv11 is tapered in width in the Dr2 direction. Therefore, it is possible to suppress the work load when the central magnet piece Dv11 is press-fitted into the magnet insertion portion 45j.

In addition, if the dimensions of the central magnet segment Dv11 are appropriately set, even if the dimensions of the first end magnetic segment Dv12 and the dimensions of the second end magnetic segment Dv13 vary, the magnet 45d is a magnet insertion portion It is possible to prevent backlash within 45j. First, it is preferable to prepare a plurality of central magnet pieces Dv11 having different dimensions in the Dr2 direction. Then, after the first end magnet piece Dv12 and the second end magnet piece Dv13 have been pressed into the magnet insertion portion 45j, the distance Ds is measured. Then, among the central magnet segments Dv11, one having a dimension in the Dr2 direction larger than the interval Ds is selected. Then, the selected central magnet piece Dv11 is inserted between the first end magnet piece Dv12 and the second end magnet piece Dv13. Thereby, it is possible to press-fit the central magnet piece Dv11 of the optimum size into the magnet insertion portion 45j, and it is possible to prevent the magnet 45d from rattling in the magnet insertion portion 45j.

Reference Signs List 1 scroll compressor, 2 shells, 2A body, 2a upper shell, 2b lower shell, 3 oil pump, 3a oil reservoir, 4 motor, 4D outer peripheral surface, 4L through hole, 4Q gap, 4a rotor, 4b stator, 4c rotor core , 4c1 core piece, 4c2 core piece, 4c3 core piece, 4d magnet, 4d1 first end, 4d2 second end, 4d3 third end, 4d4 fourth end, 4dt end, 4e first 1 end plate, 4e1 shaft hole, 4f second end plate, 4g second balancer, 4h1 rivet, 4h2 rivet, 4i shaft hole, 4j magnet insertion portion, 5 compression portion, 5a compression chamber, 6 frame, 6a suction Port, 6b thrust bearing, 6d space, 7 shaft, 7a oil passage, 8a main bearing, 8b sub bearing, 8 Swing bearing, 11 suction pipe, 12 discharge pipe, 13 discharge chamber, 13A valve, 13a space, 13b discharge port, 14 muffler, 15 oldham ring, 15b oldham space, 16 slider, 17 sleeve, 18 first balancer, 18a Cover, 20 subframes, 21 oil drainage pipe, 24j magnet insertion portion, 30 fixed scroll, 30a discharge port, 31 lap portion, 34j magnet insertion portion, 40 rocking scroll, 40a boss portion, 41 lap portion, 42D outer peripheral surface, 42d magnet, 43D outer peripheral surface, 43d magnet, 44d magnet, 44j magnet insertion part, 45d magnet, 45j magnet insertion part, Dv1 central magnet piece, Dv11 central magnet piece, Dv12 first end magnet piece, Dv13 second end Side magnet piece, Dv2 first end side magnet Dv3 second end magnet piece Dvt end Dvt11 end Dvt2 end Dvt3 end G1 first group G2 second group G3 third group Gr2 second group , SF1 inner side, SF2 outer side, SF3 end face, SF4 end face, SF5 end face, SF6 end face, SF7 end face, SF8 end face, Sr1 gap, Sr2 gap, TF1 first face, TF2 second face, TF3 inner circumferential face, TF4 inner surface, sf1 first contact surface, sf2 second contact surface, sf3 third contact surface, sf4 fourth contact surface, tf1 protrusion, tf10 protrusion, tf2 protrusion, tf20 support surface, tf3 Projection, tf 4 Projection, tfa top, tfb separation, tfc separation.

Claims

A rotor including a rotor core and a magnet inserted in the rotor core;
A stator provided around the rotor core;
Equipped with
The rotor core has a shaft hole into which the shaft is inserted, and a magnet inserted in parallel to the rotation axis direction of the shaft and having a cross section perpendicular to the rotation axis direction, and in which the magnet is inserted Including
The magnet includes an outer circumferential surface in contact with the magnet insertion portion of the rotor core,
The magnet insertion portion is formed at an end portion in a longitudinal direction of the magnet insertion portion in a cross section orthogonal to the rotation axis direction, and includes a protrusion protruding toward the magnet,
The protrusion includes a top portion in contact with the outer circumferential surface of the magnet, and a separated portion spaced from the outer circumferential surface of the magnet.
The outer peripheral surface of the magnet is an inner surface formed on the shaft hole side, an outer surface whose distance to the shaft hole is longer than a distance from the shaft hole to the inner surface, and one end of the inner surface A first contact surface provided at a first end that extends parallel to the rotation axis direction,
The motor according to claim 1, wherein the first contact surface is in contact with the top.
The outer circumferential surface of the magnet further includes a second contact surface provided at the other end of the inner surface and at a second end extending parallel to the first end;
The protrusion includes a first protrusion having the top and the separation, and a second protrusion having the top and the separation.
The first contact surface contacts the top of the first protrusion,
The motor according to claim 2, wherein the second contact surface is in contact with the top of the second protrusion.
The outer peripheral surface of the magnet is an inner surface formed on the shaft hole side, an outer surface whose distance to the shaft hole is longer than a distance from the shaft hole to the inner surface, and one end of the outer surface A third contact surface provided at a third end that extends parallel to the rotation axis direction,
The motor according to claim 1, wherein the third contact surface is in contact with the top.
The outer circumferential surface of the magnet further includes a fourth contact surface provided at the other end of the outer surface and at a fourth end extending parallel to the third end;
The protrusion includes a third protrusion having the top and the separation, and a fourth protrusion having the top and the separation.
The third contact surface contacts the top of the third protrusion;
The motor according to claim 4, wherein the fourth contact surface is in contact with the top of the fourth protrusion.
The outer peripheral surface of the magnet is an inner surface formed on the shaft hole side, an outer surface whose distance to the shaft hole is longer than a distance from the shaft hole to the inner surface, and one end of the inner surface A first contact surface provided at a first end extending in parallel to the rotational axis direction, and a second contact surface at the other end of the inner side parallel to the first end A second contact surface provided at the extending second end, and a third end provided at one end of the outer surface and extending parallel to the rotation axis direction And a fourth contact surface provided at a fourth end of the other end of the outer surface, the fourth end extending parallel to the third end,
The protrusion includes a first protrusion having the top and the separation, a second protrusion having the top and the separation, and a third protrusion having the top and the separation. And a fourth protrusion having the top and the spaced portion,
The first contact surface contacts the top of the first protrusion,
The second contact surface contacts the top of the second protrusion,
The third contact surface contacts the top of the third protrusion;
The motor according to claim 1, wherein the fourth contact surface is in contact with the top of the fourth protrusion.
The rotor includes a first end plate provided on one end surface of the rotor core and a second end plate provided on the other end surface of the rotor core,
The rotor core includes a plate-like first core piece provided on the first end plate side, a plate-like second core piece provided on the second end plate side, and the first core piece. A plate-like third core piece provided between the first core piece and the second core piece;
The protrusion is formed on the first core piece and the second core piece,
The third core piece includes an inner circumferential surface provided between the protrusion of the first core piece and the protrusion of the second core piece,
The motor according to claim 1, wherein the inner circumferential surface of the third core piece is separated from the outer circumferential surface of the magnet.
The motor according to any one of claims 1 to 7, wherein the magnet is divided.
A method of manufacturing a rotor,
Producing a rotor core in which a plurality of core pieces are stacked to form a magnet insertion portion for inserting a magnet;
An elongated first end magnet piece having an end tapered in the thickness direction, and an elongated second end including the end tapered in the thickness direction Prepare a magnet piece and a long central magnet piece,
Inserting an end of the central magnet piece into the magnet insertion part;
Press fitting the central magnet piece into the magnet insertion part;
Inserting the tapered end of the first end magnet piece into the gap between one end of the central magnet piece and the inner circumferential surface of the magnet insertion portion;
Press fitting the first end magnet piece into the magnet insertion portion;
Inserting the tapered end of the second end magnet piece into the gap between the other end of the central magnet piece and the inner circumferential surface of the magnet insertion portion;
A method of manufacturing a rotor, comprising: pressing the second end magnet piece into the magnet insertion portion.
A method of manufacturing a rotor,
Producing a rotor core in which a plurality of core pieces are stacked to form a magnet insertion portion for inserting a magnet;
A long strip comprising an elongated first end magnet piece, a elongated second end magnet piece, and an end portion whose width in a direction orthogonal to the thickness direction is tapered. Prepare the central magnet piece and
Inserting an end of the first end magnet piece into the magnet insertion portion;
Press fitting the first end magnet piece into the magnet insertion portion;
The end of the second end magnet piece is inserted into the magnet insertion portion with the first end magnet piece and the second end magnet piece separated by a predetermined distance,
Press fitting the second end magnet piece into the magnet insertion portion;
Inserting the tapered end of the central magnet piece between the first end magnet piece and the second end magnet piece;
A method of manufacturing a rotor, comprising pressing the central magnet piece into the magnet insertion portion.