CN211377720U - Motor with a stator having a stator core - Google Patents

Abstract

The utility model discloses a motor possesses: a rotor including a rotor core and a magnet inserted into the rotor core; and a stator disposed around the rotor core, the rotor core including: a shaft hole into which the shaft is inserted; and a magnet insertion portion that extends parallel to a rotation axis direction of the shaft and is elongated in a cross section orthogonal to the rotation axis direction, into which the magnet is inserted, the magnet including an outer peripheral surface that contacts the magnet insertion portion of the rotor core, the magnet insertion portion including a protrusion that is formed at an end portion in a longitudinal direction of the magnet insertion portion in the cross section orthogonal to the rotation axis direction and protrudes toward the magnet, the protrusion including: a top portion contacting with the outer peripheral surface of the magnet, and a separation portion separated from the outer peripheral surface of the magnet.

Description

Motor with a stator having a stator core

Technical Field

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

Background

A conventional motor is proposed to include: a rotatable rotor provided in a casing of the compressor and into which a shaft is inserted, and a stator provided in the casing of the compressor and around the rotor (see, for example, patent document 1). The rotor of the motor of patent document 1 includes: an elongated magnet including a first surface and a second surface that is a surface opposite to the first surface; and a rotor core formed with a magnet insertion portion. The rotor core is formed 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, there are formed: the magnet includes a first wall surface contacting the first surface of the magnet, and a second wall surface contacting the second surface of the magnet and parallel to the first wall surface. In the technique described in patent document 1, the magnet is sandwiched between the first wall surface and the second wall surface and fixed to the rotor core.

Patent document 1: japanese laid-open patent publication No. 9-200982

When the rotor rotates, a force may be applied to the magnet in a direction perpendicular to the axial direction of the rotor and parallel to the first wall surface of the magnet insertion portion. This force is the force that is intended to displace the position of the magnet and is therefore referred to herein as the displacement force. When a biasing force is applied to the magnet, a frictional force acting so as not to displace the position of the magnet is generated between the magnet and the magnet insertion portion. 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, the possibility that the magnet cannot be prevented from being displaced is increased only by the frictional force between the magnet and the magnet insertion portion.

SUMMERY OF THE UTILITY MODEL

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motor capable of more reliably preventing the position of a magnet provided in a rotor core from shifting.

The utility model discloses a motor possesses: a rotor including a rotor core and a magnet inserted into the rotor core; and a stator disposed around the rotor core, the rotor core including: a shaft hole into which the shaft is inserted; and a magnet insertion portion extending parallel to a rotation axis direction of the shaft, having an elongated shape in a cross section orthogonal to the rotation axis direction, and into which the magnet is inserted, the rotor including: a first end plate provided at one end surface of the rotor core, and a second end plate provided at the other end surface of the rotor core, the magnet including an outer circumferential surface contacting a magnet insertion portion of the rotor core, the magnet insertion portion including a protrusion formed at an end portion in a length direction of the magnet insertion portion in a cross section orthogonal to the rotation axis direction and protruding toward the magnet, the protrusion including: a top portion contacting with the outer peripheral surface of the magnet, and a separation portion separated from the outer peripheral surface of the magnet.

Preferably, the outer peripheral surface of the magnet includes: an inner side surface formed on the shaft hole side; an outer side surface that is longer in distance from the shaft hole than from the shaft hole to the inner side surface; and a first contact surface provided at one end of the inner surface, that is, a first end extending parallel to the rotation axis direction, the first contact surface being in contact with the apex portion.

Preferably, the outer peripheral surface of the magnet further includes a second contact surface provided at the other end portion of the inner side surface, that is, a second end portion extending in parallel with the first end portion, and the protruding portion includes: a first protrusion having the top and the separation portion, and a second protrusion having the top and the separation portion, the first contact surface being in contact with the top of the first protrusion, the second contact surface being in contact with the top of the second protrusion.

Preferably, the outer peripheral surface of the magnet includes: an inner side surface formed on the shaft hole side; an outer side surface that is longer in distance from the shaft hole than from the shaft hole to the inner side surface; and a third contact surface provided at a third end portion extending parallel to the rotation axis direction, which is one end portion of the outer side surface, the third contact surface being in contact with the apex portion.

Preferably, the outer peripheral surface of the magnet further includes a fourth contact surface provided at a fourth end portion extending in parallel with the third end portion, the fourth contact surface being at the other end portion of the outer peripheral surface, and the protruding portion includes: a third protrusion having the top and the separation portion, and a fourth protrusion having the top and the separation portion, the third contact surface being in contact with the top of the third protrusion, the fourth contact surface being in contact with the top of the fourth protrusion.

Preferably, the outer peripheral surface of the magnet includes: an inner side surface formed on the shaft hole side; an outer side surface that is longer in distance from the shaft hole than from the shaft hole to the inner side surface; a first contact surface provided at one end of the inner surface, that is, a first end extending parallel to the rotation axis direction; a second contact surface provided at the other end of the inner surface, that is, a second end extending parallel to the first end; a third contact surface provided at one end of the outer surface, that is, a third end extending parallel to the rotation axis direction; and a fourth contact surface provided at a fourth end portion extending in parallel with the third end portion, which is the other end portion of the outer side surface, the protruding portion including: a first protrusion having the top and the separation portion, a second protrusion having the top and the separation portion, a third protrusion having the top and the separation portion, and a fourth protrusion having the top and the separation portion, the first contact surface being in contact with the top of the first protrusion, the second contact surface being in contact with the top of the second protrusion, the third contact surface being in contact with the top of the third protrusion, and the fourth contact surface being in contact with the top of the fourth protrusion.

Preferably, the rotor core includes: the magnet includes a first core piece having a plate shape provided on the first end plate side, a second core piece having a plate shape provided on the second end plate side, and a third core piece having a plate shape provided between the first core piece and the second core piece, the first core piece and the second core piece having the protruding portions formed thereon, the third core piece including an inner peripheral surface provided between the protruding portion of the first core piece and the protruding portion of the second core piece, the inner peripheral surface of the third core piece being separated from the outer peripheral surface of the magnet.

Preferably, the magnet is of a split type.

According to the present invention, the magnet insertion portion includes a protruding portion that is formed at an end portion in a length direction of the magnet insertion portion in a cross section orthogonal to the rotation axis direction and protrudes toward the magnet. Therefore, even if a biasing force is applied to the magnet, the end of the magnet abuts against the protrusion, and the movement of the magnet in the direction of the biasing force is restricted. Therefore, according to the present invention, even if an offset force is applied to the magnet, the positional offset of the magnet can be prevented more reliably.

Drawings

Fig. 1 is a schematic sectional view of a scroll compressor 1 according to embodiment 1.

Fig. 2 is an enlarged explanatory view of the rotor 4a shown in fig. 1.

Fig. 3 is a sectional view a-a shown in fig. 2.

Fig. 4 is a sectional view B-B shown in fig. 3.

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. 4.

Fig. 6 is an explanatory diagram of the magnet 4 d.

Fig. 7 is a view showing a state where the magnet 4d is inserted into the magnet insertion portion 4j of the core piece 4c 1.

Fig. 8 is an enlarged view of the protrusion tf1 and its surroundings shown in fig. 7.

Fig. 9 is an explanatory view of the core pieces 4c2 of the second group G2 shown in fig. 4.

Fig. 10 is a view showing a state where the magnet 4d is inserted into the magnet insertion portion 4j of the core piece 4c 2.

Fig. 11 is a sectional view of rotor core 4C as viewed in section C-C shown in fig. 7.

Fig. 12 is a schematic diagram showing a case where the movement of the magnet 4d in the magnet insertion portion 4j is regulated when the biasing force F or the like is applied to the magnet 4 d.

Fig. 13 shows a modification 1 of the scroll compressor 1 according to embodiment 1.

Fig. 14 shows a modification 2 of the scroll compressor 1 according to embodiment 1.

Fig. 15 is a view showing a state where the magnet 4d is inserted into the magnet insertion portion 24j of the core piece 4c 1.

Fig. 16 is an enlarged view of the protrusion tf3 and its surroundings shown in fig. 15.

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 4c 1.

Fig. 20 is a sectional view of a rotor core 4c of the scroll compressor according to embodiment 4.

Fig. 21 is a view illustrating the structure of the first end-side magnet piece Dv 2.

Fig. 22 shows a state where the center magnet piece Dv1 is inserted into the magnet insertion portion 44 j.

Fig. 23 shows a state where the first end-side magnet piece Dv2 is inserted into the magnet insertion portion 44 j.

Fig. 24 shows a state where the second end-side magnet piece Dv3 is inserted into the magnet insertion portion 44 j.

Fig. 25 is a sectional view of a rotor core 4c of the scroll compressor according to embodiment 5.

Fig. 26 is a view illustrating the structure of the center magnet piece Dv 11.

Fig. 27 shows a state where the first end side magnet piece Dv12 is inserted into the magnet insertion portion 45 j.

Fig. 28 shows a state where the second end-side magnet piece Dv13 is inserted into the magnet insertion portion 45 j.

Fig. 29 shows a state where the center magnet piece Dv11 is inserted into the magnet insertion portion 45 j.

Detailed Description

Embodiment 1.

Hereinafter, embodiments will be described with reference to the drawings as appropriate. In the following drawings including fig. 1, the relationship between the sizes of the respective components may be different from the actual one.

< Structure of embodiment 1 >

Fig. 1 is a schematic sectional view of a scroll compressor 1 according to embodiment 1. The scroll compressor 1 compresses a refrigerant to have a high temperature and a high pressure. The scroll compressor 1 constitutes an outer contour of the scroll compressor 1, and includes: a casing 2 having an oil reservoir 3a formed at a lower portion thereof; an oil pump 3 housed in the casing 2 and drawing oil from the oil reservoir 3 a; and a motor 4 including a rotor 4a rotatably provided and a stator 4b fixed to the housing 2. Further, the scroll compressor 1 includes: a compression portion 5 including a fixed scroll 30 and an oscillating scroll 40; a frame 6 that houses the orbiting scroll 40; and a shaft 7 fixed to the rotor 4 a. Further, the scroll compressor 1 includes: a suction pipe 11 that guides the refrigerant into the casing 2; and a discharge pipe 12 for guiding the refrigerant compressed by the compression unit 5 from the inside of the casing 2 to the outside of the casing 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. Further, the scroll compressor 1 includes: a cross ring 15 that restricts the orbiting scroll 40 from rotating; a cylindrical slider 16 provided at an upper end of the shaft 7; a main bearing 8a provided to the frame 6; and a sleeve 17 provided between the main bearing 8a and the shaft 7. Further, the scroll compressor 1 includes: a first balancer 18 provided to the shaft 7; a sub-frame 20 fixed to a lower portion of the case 2; a sub-bearing 8b provided to the sub-frame 20; and an oil drain pipe 21 that drains excess oil on the frame 6.

The housing 2 includes: a cylindrical body 2A; a dome-shaped upper case 2A provided at an upper end of the main body 2A; and a dome-shaped lower case 2b provided at a lower end portion of the main body portion 2A. The oil pump 3 supplies the oil pumped up from the oil reservoir 3a to an oil passage 7a formed in the shaft 7. The motor 4 rotates the shaft 7. The motor 4 is provided below the compression portion 5 and above the sub-frame 20. Power is supplied to the stator 4b of the motor 4 from an inverter, not shown. The rotor 4a is rotated by supplying power to the stator 4 b. The compression unit 5 compresses the refrigerant. The fixed scroll 30 is fixed to a body portion 2A of the casing 2. The fixed scroll 30 is provided with a discharge chamber 13. The orbiting scroll 40 includes a hollow cylindrical projection 40a into which the upper end of the shaft 7 is inserted. The inner peripheral portion of the projection 40a is provided with a rocking bearing 8 c. The orbiting scroll 40 performs an orbiting motion by the rotation of the shaft 7. The fixed scroll 30 includes a spiral overlap portion 31, and the orbiting scroll 40 includes a spiral overlap portion 41 that compresses the refrigerant together with the overlap portion 31. A compression chamber 5a for compressing the refrigerant is formed in a space between the overlapping portion 31 and the overlapping portion 41. The fixed scroll 30 is provided with a discharge port 30a through which the refrigerant compressed in the compression chamber 5a passes.

The frame 6 is fixed to the housing 2. The frame 6 supports the shaft 7 via a main bearing 8 a. In addition, the frame 6 supports the oscillating scroll 40. The frame 6 is provided with a suction port 6a for guiding the refrigerant located below the frame 6 to the compression chamber 5 a. In addition, a cross space 15b in which a cross ring 15 is provided is formed in the frame 6. Further, a concave space 6d in which the projection 40a is disposed is formed in the frame 6. Further, the frame 6 is provided with a thrust bearing 6b for sliding the orbiting scroll 40. The shaft 7 transmits the rotational force of the rotor 4a to the oscillating scroll 40. The shaft 7 is rotatably supported by a main bearing 8a and a sub bearing 8 b. Suction pipe 11 is provided in main body 2A of casing 2, and discharge pipe 12 is provided in upper casing 2A of casing 2. The discharge chamber 13 is formed with: a space 13a into which the refrigerant having passed through the discharge port 30a of the fixed scroll 30 flows; and a discharge port 13b communicating with the space 13A and blocked by a valve 13A. When the pressure in the space 13A becomes higher than a predetermined pressure, the valve 13A is separated from the discharge port 13 b. The muffler 14 suppresses pulsation of the refrigerant discharged from the discharge chamber 13.

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

Fig. 2 is an enlarged explanatory view of the rotor 4a shown in fig. 1. Fig. 3 is a sectional view a-a shown in fig. 2. Fig. 4 is a sectional view B-B shown in fig. 3. As shown in fig. 2, the rotor 4a includes: a cylindrical rotor core 4c, a first end plate 4e provided on one end face of the rotor core 4c, a second end plate 4f provided on the other end face of the rotor core 4c, and a second balancer 4g provided on the second end plate 4 f. The rotor 4a further includes: rivets 4h1 inserted into the first end plate 4e, the rotor core 4c, and the second end plate 4 f; and rivets 4h2 inserted into the first end plate 4e, the rotor core 4c, the second end plate 4f, and the second balancer 4 g. As shown in fig. 4, the rotor core 4c is formed 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. The core pieces 4c1, 4c2, and 4c3 are disk-shaped. The iron core sheet 4c1 belonging to the first group G1 corresponds to the first iron core sheet, the iron core sheet 4c3 belonging to the third group G3 corresponds to the second iron core sheet, and the iron core sheet 4c2 belonging to the second group G2 corresponds to the third iron core sheet. The shape of the iron core piece 4c1 is the same as the shape of the iron core piece 4c3, but the shape of the iron core piece 4c1 is different from the shape of the iron core piece 4c 2. The second group G2 is configured 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 in the center of the rotor core 4 c. The rotation axis direction Dr1 of the shaft 7 is parallel to the direction in which the core segments of the rotor core 4c are stacked. As shown in fig. 3 and 4, the rotor core 4c is provided with a magnet insertion portion 4j extending parallel to the rotation axis direction Dr 1. The magnet insertion portion 4j is formed in an elongated shape in a cross section orthogonal to the rotation axis direction Dr 1. The magnet insertion portion 4j is formed with a through hole into which the magnet 4d is inserted. The rotor core 4c is formed with 6 magnet insertion portions 4 j. The adjacent 2 magnet insertion portions 4j are arranged at an angle of 60 degrees with respect to the center of the rotor core 4 c. As shown in fig. 3 and 4, a plurality of through holes 4L are formed in the rotor core 4c on the outer circumferential surface side of the position where the magnet insertion portion 4j is formed.

The first end plate 4e and the second end plate 4f prevent the magnet 4d from flying out of the magnet insertion portion 4 j. A shaft hole 4e1 into which the shaft 7 is inserted is formed in the center of the first end plate 4e, and a shaft hole 4e1 into which the shaft 7 is inserted is also formed in the center of the second end plate 4 f. The rivet 4h1 is a member for attaching the first end plate 4e and the second end plate 4f to the rotor core 4 c. The rivet 4h2 is a member that attaches the first end plate 4e and the second end plate 4f to the rotor core 4c and attaches the second balancer 4g to the second end plate 4 f. The second balancer 4g ensures the balance of the shaft 7, the rotor 4a, and the orbiting scroll 40 when the shaft 7, the rotor 4a, and the orbiting scroll 40 operate.

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. 4. Fig. 6 is an explanatory diagram of the magnet 4 d. Fig. 7 is a view showing a state where the magnet 4d is inserted into the magnet insertion portion 4j of the core piece 4c 1. Fig. 8 is an enlarged view of the protrusion tf1 and its surroundings shown in fig. 7. The direction Dr2 is the 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 Dr 1. The structure of the magnet 4d and the structure of the core piece 4c1 will be described based on fig. 5 to 8 and fig. 2 to 4 described above. The shape of the core piece 4c3 is the same as that of the core piece 4c1, and therefore, the description thereof is omitted.

As shown in fig. 6, the magnet 4D includes an outer peripheral surface 4D that contacts the magnet insertion portion 4j of the rotor core 4 c. The outer peripheral surface 4D includes: an inner surface SF1 which is a plane formed on the shaft hole 4i side, and an outer surface SF2 which is a plane parallel to the inner surface SF 1. Here, as shown in fig. 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 4 i. As shown in fig. 4 and 6, the outer peripheral surface 4D includes: a first contact surface sf1 provided at the first end portion 4d1 extending in parallel with the rotation axis direction Dr1, and a second contact surface sf2 provided at the second end portion 4d2 extending in parallel with the first end portion 4d 1. The first end 4d1 is one end in the direction Dr2 of the inner side surface SF1, and the second end 4d2 is the other end in the direction Dr2 of the inner side surface SF 1. 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 surfaces. Further, as shown in fig. 6, the outer peripheral surface 4D includes: an end face SF3 provided at one end in the direction Dr2 of the outer side face SF2 and orthogonal to the outer side face SF 2; and an end face SF4 provided at the other end portion in the direction Dr2 of the outer side face SF2 and orthogonal to the outer side face SF 2. 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 surfaces.

As shown in fig. 5 and 7, the magnet insertion portion 4j includes: a first face TF1 facing the inner face SF1 of the magnet 4d with a gap therebetween, and a second face TF2 contacting the outer face SF2 of the magnet 4 d. First face TF1 and second face TF2 are planar. As shown in fig. 3 and 5, the magnet insertion portion 4j includes: a protrusion tf1 formed at one end portion in the longitudinal direction of the magnet insertion portion 4j in a cross section orthogonal to the rotation axis direction Dr1, and a protrusion tf2 formed at the other end portion in the longitudinal direction of the magnet insertion portion 4j in a cross section orthogonal to the rotation axis direction Dr 1. The protrusion tf1 protrudes toward the first contact surface sf1, and the protrusion tf2 protrudes toward the second contact surface sf 2. As shown in fig. 5 to 7, the protrusion tf1 is provided on the first end 4d1 side of the inner surface SF1, and the protrusion tf2 is provided on the second end 4d2 side of the inner surface SF 1. 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 protrusion tf1 and the protrusion tf2 is symmetrical, but the shape of the protrusion tf1 is the same as that of the protrusion tf 2. Therefore, the shape of the protrusion tf1 will be mainly described here. As shown in fig. 8, the protrusion tf1 includes: a top portion tfa in contact with the first contact surface sf1 of the magnet 4 d; a separation portion tfb separated from the first contact surface sf1 of the magnet 4 d; and a separating portion tfc separated from the first contact surface sf1 of the magnet 4 d. Top tfa is sandwiched between split tfb and split tfc. Although not shown, the protrusion tf2 has the same shape as the protrusion tf 1. That is, the protrusion tf2 includes: a top tf contacting the second contact surface sf2, a separated portion tfb separated from the second contact surface sf2, and a separated portion tfc separated from the second contact surface sf 2.

Fig. 9 is an explanatory view of the core pieces 4c2 of the second group G2 shown in fig. 4. Fig. 10 is a view showing a state where the magnet 4d is inserted into the magnet insertion portion 4j of the core piece 4c 2. Fig. 11 is a sectional view of rotor core 4C as viewed in section C-C shown in fig. 7. Next, the structure of the core piece 4c2 will be explained. The shape of the core piece 4c2 is different from that of the core piece 4c1 in the following description, but is otherwise the same. The above-described protrusion tf1 and protrusion tf2 are not formed in the iron core piece 4c 2. That is, as shown in fig. 9 and 10, the magnet insertion portion 4j includes: an inner peripheral surface TF3 opposed to the first contact surface sf1 of the magnet 4d without contact; and an inner peripheral face TF4 opposed to the second contact face sf2 of the magnet 4d without contact. As shown in fig. 11, the inner peripheral surface TF3 is provided between the protrusion TF1 of the core piece 4c1 and the protrusion TF1 of the core piece 4c 3. Further, the inner peripheral face TF4 is provided between the protrusion TF2 of the iron core piece 4c1 and the protrusion TF2 of the iron core piece 4c 3.

As shown in fig. 11, the first contact surface sf1 of the magnet 4d is in contact with the protrusion tf1 of the core segment 4c1 of the first group G1 and the protrusion tf1 of the core segment 4c3 of the third group G3, but is not in contact with the core segment 4c2 of the second group G2. That is, as shown in fig. 10 and 11, a gap 4Q is formed between the core piece 4c2 of the second group G2 and the first contact surface sf 1. The second contact surface sf2 of the magnet 4d is in contact with the protrusion tf2 of the core segment 4c1 of the first group G1 and the protrusion tf2 of the core segment 4c3 of the third group G3, but is not in contact with the core segment 4c2 of the second group G2. That is, a gap 4Q is formed between the core piece 4c2 of the second group G2 and the second contact surface sf 2.

The shape of the magnet 4d will be described with reference to fig. 11. As shown in fig. 11, the magnet 4d has an end portion 4dt parallel to the direction Dr2 and having a tapered width. The magnet 4d is inserted into the magnet insertion portion 4j of the rotor core 4c, and the end portion 4dt is a portion of the magnet 4d that is first inserted into the magnet insertion portion 4 j.

Action of embodiment 1

The operation of the scroll compressor 1 will be described based on fig. 1. When the stator 4b receives power supply from an inverter, not shown, the rotor 4a rotates. The rotor 4a rotates, and the shaft 7 rotates. When the shaft 7 rotates, the oil in the oil reservoir 3a is pumped up by the oil pump 3 and flows into the oil passage 7a of the shaft 7. The oil that has flowed into the oil passage 7a lubricates the rocking bearing 8c, and then is supplied to the space 6d formed in the frame 6. The oil in the space 6d is supplied to the cross space 15b while lubricating the thrust bearing 6 b. The oil supplied to the cross space 15b lubricates the cross ring 15. The oil supplied to the cross space 15b is returned to the oil reservoir 3a through the oil drain pipe 21.

The refrigerant flows into the casing 2 from the suction pipe 11. The refrigerant flowing into the casing 2 flows into the compression chamber 5a through the suction port 6a of the frame 6. Here, the orbiting scroll 40 performs an orbiting motion by the rotation of the rotor 4 a. The refrigerant is compressed in the compression chamber 5a by the oscillating movement of the oscillating scroll 40. The refrigerant compressed in the compression chamber 5a flows through the discharge port 30a of the fixed scroll 30, the discharge port 13b of the discharge chamber 13, and the muffler 14 to the discharge pipe 12.

Fig. 12 is a schematic diagram showing a state in which the movement of the magnet 4d is restricted when the biasing force F or the like is applied to the magnet 4 d. The offset force F and the like cause the positional offset of the magnet 4d and are generated when the rotor 4a rotates. Here, the direction of the biasing force F is parallel to the direction from the protrusion tf2 toward the protrusion tf 1. When the biasing force F is applied to the magnet 4d, the magnet 4d abuts on the protrusion tf1, and thus the magnet 4d receives the reaction force F from the protrusion tf 1. The component fx of the reaction force F parallel to the direction Dr2 is equal to the offset force F. That is, even if the biasing force F is applied to the magnet 4d, the first contact surface sf1 of the magnet 4d receives the reaction force F from the protrusion tf1, and therefore, the movement of the magnet 4d in the direction of the biasing force F is restricted. The component fy of the reaction force f orthogonal to the direction Dr2 acts to press the outer surface SF2 of the magnet 4d against the second surface TF 2.

Although not shown, when the direction of the biasing force is parallel to the direction from the protrusion tf1 to the protrusion tf2, the magnet 4d abuts against the protrusion tf2 or the magnet 4d receives the reaction force f from the protrusion tf2, and movement of the magnet 4d is restricted.

Even if the biasing force F2 is applied to the rotor 4a, the magnet 4d is restricted from moving in the direction of the biasing force F2 because the magnet 4d abuts against the protrusions tf1 and tf 2. In addition, the direction of the biasing force F2 is a direction from the first face TF1 toward the second face TF 2. Even if the biasing force F3 is applied to the rotor 4a, the magnet 4d abuts on the second face TF2, and therefore, the movement of the magnet 4d in the direction of the biasing force F3 is restricted. The direction of the biasing force F3 is opposite to the direction of the biasing force F2.

< Effect of embodiment 1 >

The magnet insertion portion 4j includes a protrusion tf1, and the protrusion tf1 is formed at an end portion in the longitudinal direction of the magnet insertion portion 4j in a cross section orthogonal to the rotation axis direction Dr1 and protrudes toward the magnet 4 d. Therefore, even if the biasing force F is applied to the magnet 4d, the magnet 4d receives the reaction force F from the protrusion tf1, and the movement of the magnet 4d in the direction of the biasing force F is restricted. Therefore, the positional displacement of the magnet 4d is more reliably prevented when the rotor 4a rotates. Further, since the position of the magnet 4d is more reliably prevented from being displaced, the magnet 4d can be prevented from colliding with the inner peripheral surface of the magnet insertion portion 4j when the rotor 4a rotates. As a result, the magnet 4d and the rotor 4a are prevented from being damaged, and the generation of noise due to collision of the magnet 4d with the inner peripheral surface of the magnet insertion portion 4j is prevented.

Protrusion tf1 includes top tfa, split tfb, and split tfc. Contact the magnet 4d at the top tfa, but not contact the magnet 4d at the separated portion tfb and the separated portion tfc, thereby suppressing the area of the core piece 4c1 in contact with the magnet 4 d. This can suppress 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 4 j. Therefore, the work load when the magnet 4d is press-fitted into the magnet insertion portion 4j can be suppressed.

The magnet insertion portion 4j includes a protrusion tf2 having the same configuration as the protrusion tf1, in addition to the protrusion tf 1. Therefore, the above-described effect of preventing the positional deviation of the magnet 4d, the effect of preventing the magnet 4d from colliding with the inner peripheral surface of the magnet insertion portion 4j, and the effect of suppressing the work load when the magnet 4d is press-fitted into the magnet insertion portion 4j are further improved.

The ferrochip 4c2 of the second group Gr2 comprises: an inner peripheral face TF3 separated from the outer peripheral face 4D of the magnet 4D, and an inner peripheral face TF4 separated from the outer peripheral face 4D of the magnet 4D. Therefore, the inner peripheral face TF3 and the inner peripheral face TF4 suppress the area of the iron core piece 4c2 in contact with the magnet 4 d. This can suppress friction between the outer peripheral surface 4D of the magnet 4D and the core piece 4c2 when the magnet 4D is press-fitted into the magnet insertion portion 4 j. Therefore, the work load when the magnet 4d is press-fitted into the magnet insertion portion 4j is suppressed.

The magnetic resistance of the refrigerant is larger than the iron or the like constituting the rotor core 4 c. Therefore, the magnetic flux of the magnet 4d does not easily pass through the refrigerant. Here, the outer side surface SF2 of the magnet 4d contacts the second surface TF2 of the magnet insertion portion 4 j. Therefore, the refrigerant does not flow between outer side surface SF2 and second face TF 2. This reduces the portion of the magnet 4d in the region around the magnet 4d where the magnetic flux of the magnet 4d does not easily pass. Therefore, a decrease in the operating efficiency of the motor 4 is suppressed.

In the description of embodiment 1, the embodiment of the rotor core 4c including the core segment 4c2 having a shape different from that of the core segment 4c1 is described, but the invention is not limited to this embodiment. That is, the shape of all the core segments provided in the rotor core 4c may be the same as the shape of the core segment 4c 1. In the description of embodiment 1, the mode in which the motor 4 is applied to the scroll compressor 1 is described, but the invention is not limited to this mode. The motor 4 may be applied to an object other than the compressor.

< modification 1 >

Fig. 13 shows a modification 1 of the scroll compressor 1 according to embodiment 1. In embodiment 1, the embodiment in which the protruding portion tf1 is formed in a curved surface shape has been described, but the embodiment is not limited thereto. As shown in fig. 13, the separating portion tfb and the separating portion tfc may be planar. Thus, the top tfa of modification 1 is sharper than the top tfa of embodiment 1. As a result, the contact area between the protrusion tf10 and the magnet 4d in modification 1 is narrower than the contact area between the protrusion tf1 and the magnet 4d in embodiment 1. Even in modification 1, the same effects as those in embodiment 1 can be obtained.

< modification 2 >

Fig. 14 shows a modification 2 of the scroll compressor 1 according to embodiment 1. In embodiment 1, the protruding portion tf1 is formed at one end portion in the longitudinal direction of the magnet insertion portion 4j in the cross section orthogonal to the rotation axis direction Dr1, and the protruding portion tf2 is formed at the other end portion in the longitudinal direction of the magnet insertion portion 4j in the cross section orthogonal to the rotation axis direction Dr 1. But is not limited to this manner. In modification 2, a protrusion tf1 is formed at one end in the longitudinal direction of the magnet insertion portion 4j in a cross section perpendicular to the rotation axis direction Dr 1. On the other hand, in the cross section orthogonal to the rotation axis direction Dr1, a support surface tf20 is formed at the other end portion in the longitudinal direction of the magnet insertion portion 4j instead of the protrusion portion tf 2. The bearing surface tf20 is in contact with the second contact surface sf2 of the magnet 4 d. Further, the support surface tf20 may not protrude toward the second contact surface sf 2. Even in modification 2, the same effects as those in embodiment 1 can be obtained.

Embodiment 2.

In embodiment 2, the same reference numerals are given to the same portions as those in embodiment 1, and the description thereof is omitted, and the differences from embodiment 1 will be mainly described. In embodiment 1, the end side of the inner surface SF1 of the magnet 4d is in contact with the magnet insertion portion 4 j. On the other hand, in embodiment 2, the end side of the outer side surface SF2 of the magnet 42d is in contact with the magnet insertion portion 24 j. Fig. 15 is a view showing a state where the magnet 4d is inserted into the magnet insertion portion 24j of the core piece 4c 1. Fig. 16 is an enlarged view of the protrusion tf3 and its surroundings shown in fig. 15. Since the shape of the iron core piece 4c3 is the same as that of the iron core piece 4c1, the description of the iron core piece 4c3 is omitted in the embodiment.

< Structure of embodiment 2 >

The outer peripheral surface 42D of the magnet 42D includes: a third contact surface sf3 provided at a third end portion 4d3 extending in parallel with the rotation axis direction Dr1, and a fourth contact surface sf4 provided at a fourth end portion 4d4 extending in parallel with the third end portion 4d 3. The third end 4d3 is one end in the direction Dr2 of the outer side surface SF2, and the fourth end 4d4 is the other end in the direction Dr2 of the outer side surface SF 2. 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 surfaces. As shown in fig. 15, the outer peripheral surface 42D includes: an end face SF5 provided at one end portion in the direction Dr2 of the inner side face SF1, and an end face SF6 provided at the other end portion in the direction Dr2 of the inner side face SF 1. 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 surfaces. First face TF1 is in contact with medial side SF1 and second face TF2 is opposite lateral side SF2 with a gap.

The magnet insertion portion 24j includes: 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 Dr 1; and a protrusion tf4 formed at the other end in the longitudinal direction of the magnet insertion portion 24j in a cross section orthogonal to the rotation axis direction Dr 1. The protrusion tf3 protrudes toward the third contact surface sf3, and the protrusion tf4 protrudes toward the fourth contact surface sf 4. The protrusion tf3 is provided on the third end 4d3 side of the outer side surface SF2, and the protrusion tf4 is provided on the fourth end 4d4 side of the outer side surface SF 2. The arrangement of the protrusion tf3 and the protrusion tf4 is symmetrical, but the shape of the protrusion tf3 is the same as the shape of the protrusion tf 4. 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 includes: a top portion tfa that contacts the third contact surface sf3 of the magnet 42d, a separation portion tfb that separates from the third contact surface sf3 of the magnet 42d, and a separation portion tfc that separates from the third contact surface sf3 of the magnet 42 d. Although not shown, the protrusion tf4 has the same shape as the protrusion tf 3. That is, the protrusion tf4 includes: a top portion tfa contacting the fourth contact surface sf4, a separated portion tfb separated from the fourth contact surface sf4, and a separated portion tfc separated from the fourth contact surface sf 4.

Although not shown, the core piece 4c2 has the same shape as the core piece 4c1 except that the above-described protruding portions tf3 and tf4 are not formed.

< Effect of embodiment 2 >

Embodiment 2 also has the same effect as embodiment 1.

The projections tf3 and tf4 may be the same as those of modification 1 of embodiment 1.

Embodiment 3.

In embodiment 3, the same reference numerals are given to the same parts as those in embodiments 1 and 2, and the description thereof is omitted, and the differences from embodiments 1 and 2 will be mainly described. Embodiment 3 is a combination of embodiment 1 and embodiment 2. 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 4c 1.

< Structure of embodiment 3 >

The outer peripheral surface 43D of the magnet 43D includes: the first contact surface sf1 described in embodiment 1, the second contact surface sf2 described in embodiment 1, the third contact surface sf3 described in embodiment 2, and the fourth contact surface sf4 described in embodiment 2. Further, the outer peripheral surface 43D of the magnet 43D includes: an end face SF7 formed from an end of the first contact face SF1 to an end of the third contact face SF3, and an end face SF8 formed from an end of the second contact face SF2 to an end of the fourth contact face SF 4. 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 surfaces. First face TF1 faces medial side SF1 with a gap therebetween, and second face TF2 faces lateral side SF2 with a gap therebetween.

< Effect of embodiment 3 >

Embodiment 3 has the following effects in addition to the same effects as embodiment 1. In embodiment 3, first face TF1 and second face TF2 do not contact magnet insertion portion 34 j. Therefore, the area of contact between the magnet 43d and the magnet insertion portion 34j is further suppressed. Therefore, the work load when the magnet 43d is press-fitted into the magnet insertion portion 34j is further suppressed.

The projection tf1, the projection tf2, the projection tf3 and the projection tf4 may be the same as those of the modification 1 of embodiment 1.

Embodiment 4.

In embodiment 4, the same reference numerals are given to the same portions as those in embodiments 1 to 3, and the description thereof is omitted, and the differences from embodiments 1 to 3 will be mainly described.

< Structure of embodiment 4 >

Fig. 20 is a sectional view of a rotor core 4c of the scroll compressor according to embodiment 4. Fig. 21 is a view illustrating the structure of the first end-side magnet piece Dv 2. As shown in fig. 20, the configuration of all core segments of the rotor core 4c according to embodiment 4 is the same as the configuration of the core segment 4c1 described in embodiment 1. The magnet 44d is of a split type. That is, as shown in fig. 20 and 21, the magnet 44d includes: the elongated center magnet piece Dv1, the elongated first end-side magnet piece Dv2 including the end portion Dvt2 that is tapered in the thickness direction, and the second end-side magnet piece Dv3 having the same shape as the first end-side magnet piece Dv 2.

< method of manufacturing embodiment 4 >

Fig. 22 shows a state where the center magnet piece Dv1 is inserted into the magnet insertion portion 44 j. Fig. 23 shows a state where the first end-side magnet piece Dv2 is inserted into the magnet insertion portion 44 j. Fig. 24 shows a state where the second end-side magnet piece Dv3 is inserted into the magnet insertion portion 44 j. First, the core pieces 4c1 are laminated in multiple layers to manufacture the rotor core 4 c. A magnet insertion portion 44j into which the magnet 44d is inserted is formed in the rotor core 4 c. Next, the center magnet piece Dv1, the first end-side magnet piece Dv2, and the second end-side magnet piece Dv3 are prepared. Then, as shown in fig. 22, the center magnet piece Dv1 is inserted into the magnet insertion portion 44j and press-fitted into the magnet insertion portion 44 j. Next, as shown in fig. 23, the tapered end Dvt2 of the first end-side magnet piece Dv2 is inserted into the gap Sr 1. The gap Sr1 is formed between one end of the center magnet piece Dv1 and the inner peripheral surface of the magnet insertion portion 44 j. Then, the first end-side magnet piece Dv2 is press-fitted into the gap Sr 1. As shown in fig. 24, the tapered end Dvt3 of the second end-side magnet piece Dv3 is inserted into the gap Sr 2. The gap Sr2 is formed between the other end of the center magnet piece Dv1 and the inner peripheral surface of the magnet insertion portion 44 j. Then, the second end-side magnet piece Dv3 is press-fitted into the gap Sr 2.

< Effect of embodiment 4 >

If power is supplied to the stator, the stator generates magnetism. The magnet of the rotor magnetically interacts with the stator so that the rotor rotates. The magnetic flux generated by the stator passes through the magnets of the rotor. Thus generating eddy currents in the magnets of the rotor. When the magnet of the rotor generates eddy current, the magnet generates heat and the magnet is demagnetized, thereby reducing the operating efficiency of the motor. Here, the magnitude of the eddy current increases in proportion to the increase in the surface area of the magnet of the rotor. In embodiment 4, since the magnet 44d is divided into three, the surface area of each magnet can be suppressed. That is, the surface area of the center magnet piece Dv1 is smaller than the surface area of the magnet 44d in the case where the magnet 44d is not divided. The same applies to the surface area of the first end-side magnet piece Dv2 and the surface area of the second end-side magnet piece Dv 3. Therefore, the eddy current generated by the center magnet piece Dv1 is smaller than the eddy current generated by the magnet 44d if the magnet 44d is not divided. The eddy current generated by the first end-side magnet piece Dv2 is similar to the eddy current generated by the second end-side magnet piece Dv 3. As described above, in embodiment 4, since the eddy current generated in the center magnet piece Dv1 can be suppressed, heat generation of the center magnet piece Dv1 can be suppressed. Further, since the eddy current generated in the first end-side magnet piece Dv2 can be suppressed, heat generation of the first end-side magnet piece Dv2 can be suppressed. Further, since the eddy current generated in the second end-side magnet piece Dv3 can be suppressed, heat generation of the second end-side magnet piece Dv3 can be suppressed. Therefore, in embodiment 4, heat generation of each magnet can be suppressed, and thus a decrease in the operating efficiency of the motor can be suppressed. In embodiment 4, the magnet 44d is divided into three, but the magnet 44d may be divided into two or four or more, and similar effects can be obtained. That is, the magnet 44d may be divided into two or four or more, and heat generation of each magnet can be suppressed, thereby suppressing a decrease in the operating efficiency of the motor.

When the first end-side magnet piece Dv2 is pressed in, friction occurs not only between the first end-side magnet piece Dv2 and the magnet insertion portion 44j, but also between the first end-side magnet piece Dv1 and the center magnet piece Dv 1. Therefore, the work load when the first end-side magnet piece Dv2 is pressed in is likely to increase. However, the end Dvt2 of the first end-side magnet piece Dv2 becomes tapered in the thickness direction. Therefore, the work load when the first end-side magnet piece Dv2 is press-fitted into the gap Sr1 can be suppressed. Further, since the end Dvt3 of the second end-side magnet piece Dv3 is also tapered in the thickness direction, the work load when the second end-side magnet piece Dv3 is press-fitted into the gap Sr2 can be suppressed.

Embodiment 5.

In embodiment 5, the same reference numerals are given to the same portions as those in embodiments 1 to 4, and the description thereof is omitted, and the differences from embodiments 1 to 4 will be mainly described.

< Structure of embodiment 5 >

Fig. 25 is a sectional view of a rotor core 4c of the scroll compressor according to embodiment 5. Fig. 26 is a view illustrating the structure of the center magnet piece Dv 11. As shown in fig. 25, the configuration of all core segments of the rotor core 4c according to embodiment 5 is the same as the configuration of the core segment 4c1 described in embodiment 1. Further, the magnet 45d is divided into three. That is, as shown in fig. 25 and 26, the magnet 45d includes: the elongated first end-side magnet piece Dv12, the elongated second end-side magnet piece Dv13, and the elongated center magnet piece Dv11 that includes the end portion Dvt11 that is tapered in width in the Dr2 direction. The Dr2 direction is a direction orthogonal to the thickness direction of the magnet 45 d.

< method of manufacturing in embodiment 5 >

Fig. 27 shows a state where the first end side magnet piece Dv12 is inserted into the magnet insertion portion 45 j. Fig. 28 shows a state where the second end-side magnet piece Dv13 is inserted into the magnet insertion portion 45 j. Fig. 29 shows a state where the center magnet piece Dv11 is inserted into the magnet insertion portion 45 j. First, the core pieces 4c1 are laminated in multiple layers to manufacture the rotor core 4 c. A magnet insertion portion 44j into which the magnet 44d is inserted is formed in the rotor core 4 c. Next, the first end-side magnet piece Dv12, the second end-side magnet piece Dv13, and the center magnet piece Dv11 are prepared. As shown in fig. 27, the end of the first end-side magnet piece Dv12 is inserted into the magnet insertion portion 45 j. Then, the first end-side magnet piece Dv12 is press-fitted into the magnet insertion portion 45 j. Next, as shown in fig. 28, the end of the second end-side magnet piece Dv13 is inserted into the magnet insertion portion 45j with the first end-side magnet piece Dv12 being spaced apart from the second end-side magnet piece Dv13 by a predetermined distance Ds. Then, the second end-side magnet piece Dv13 is press-fitted into the magnet insertion portion 45 j. The interval Ds is set narrower than the width dimension of the center magnet piece Dv11 in the direction parallel to the direction Dr 2. As shown in fig. 29, the tapered end Dvt11 of the center magnet piece Dv11 is inserted between the first end-side magnet piece Dv12 and the second end-side magnet piece Dv 13. Then, the center magnet piece Dv11 is press-fitted into the magnet insertion portion 45 j.

< Effect of embodiment 5 >

In embodiment 5, as in embodiment 4, since the magnet 45d is divided into three, the same effect as in embodiment 4 can be obtained. That is, since heat generation of each magnet can be suppressed, a decrease in the operating efficiency of the motor can be suppressed.

When the center magnet piece Dv11 is pressed in, friction occurs not only with the magnet insertion portion 45j but also with the first end-side magnet piece Dv12 and the second end-side magnet piece Dv13 in the center magnet piece Dv 11. Therefore, the work load when the center magnet piece Dv11 is pressed in is likely to increase. However, the width of the end Dvt11 of the center magnet piece Dv11 in the Dr2 direction is tapered. Therefore, the work load when the center magnet piece Dv11 is press-fitted into the magnet insertion portion 45j can be suppressed.

Further, if the size of the center magnet piece Dv11 is appropriately set, the magnet 45d can be prevented from wobbling in the magnet insertion portion 45j even if there is a difference between the size of the first end-side magnet piece Dv12 and the size of the second end-side magnet piece Dv 13. First, a plurality of center magnet pieces Dv11 having different dimensions in the Dr2 direction may be prepared. Then, after the first end-side magnet piece Dv12 and the second end-side magnet piece Dv13 are completely pressed into the magnet insertion portion 45j, the interval Ds is measured. Among the central magnet pieces Dv11, the magnet piece having a dimension in the Dr2 direction larger than the spacing Ds is selected. Then, the selected center magnet piece Dv11 is inserted between the first end-side magnet piece Dv12 and the second end-side magnet piece Dv 13. Thus, the center magnet piece Dv11 having an optimum size can be press-fitted into the magnet insertion portion 45j, and the magnet 45d can be prevented from wobbling in the magnet insertion portion 45 j.

Description of the reference numerals

1 … scroll compressor; 2 … shell; 2a … body portion; 2a … upper housing; 2b … lower housing; 3 … oil pump; 3a … oil reservoir; 4 … motor; 4D … outer circumferential surface; 4L … through holes; a 4Q … gap; 4a … rotor; 4b … stator; 4c … rotor core; 4c1 … iron core plate; 4c2 … iron core plate; 4c3 … iron core plate; 4d … magnet; 4d1 … first end; 4d2 … second end; 4d3 … third end; 4d4 … fourth end; 4dt … end; 4e … first end plate; 4e1 … axle hole; 4f … second end panel; 4g … second balancer; 4h1 … rivet; 4h2 … rivet; 4i … shaft hole; 4j … magnet insertion part; 5 … compression part; 5a … compression chamber; 6 … framework; 6a … suction inlet; 6b … thrust bearing; 6d … space; 7 … axes; 7a … oil path; 8a … main bearing; 8b … secondary bearing; 8c … rocking bearings; 11 … suction tube; 12 … discharge pipe; 13 … exit the chamber; a 13a … valve; 13a … space; 13b … discharge port; 14 … a muffler; 15 … cross-shaped ring; 15b … cross space; 16 … sliders; 17 … a sleeve; 18 … a first balancer; 18a … cover; 20 … sub-frames; 21 … oil drain pipe; 24j … magnet insertion; 30 … fixed scroll; 30a … discharge port; 31 … overlap; 34j … magnet insertion part; 40 … oscillating scroll member; 40a … protrusions; 41 … overlap; 42D … outer circumferential surface; a 42d … magnet; 43D … outer circumferential surface; a 43d … magnet; a 44d … magnet; 44j … magnet insertion part; a 45d … magnet; 45j … magnet insertion; dv1 … center magnet piece; dv11 … center magnet piece; a Dv12 … first end side magnet piece; a Dv13 … second end side magnet piece; a Dv2 … first end side magnet piece; a Dv3 … second end side magnet piece; dvt … end portions; dvt11 … end portions; dvt2 … end portions; dvt3 … end portions; g1 … first group; g2 … second group; g3 … third group; gr2 … second group; medial SF1 …; SF2 … lateral side; SF3 … end face; SF4 … end face; SF5 … end face; SF6 … end face; SF7 … end face; SF8 … end face; a Sr1 … gap; a Sr2 … gap; TF1 … first side; TF2 … second side; TF3 … inner peripheral surface; TF4 … inner peripheral surface; sf1 … first contact surface; sf2 … second contact surface; sf3 … third contact surface; sf4 … fourth contact surface; tf1 … projection; tf10 … projection; tf2 … projection; tf20 … bearing surface; tf3 … projection; tf4 … projection; tfa … at the top; tfb … a separating part; part tfc ….

Claims (8)

1. A motor is characterized by comprising:

a rotor including a rotor core and a magnet inserted into the rotor core; and

a stator provided around the rotor core,

the rotor core includes: a shaft hole into which the shaft is inserted; and a magnet insertion portion extending parallel to a rotation axis direction of the shaft, having an elongated shape in a cross section orthogonal to the rotation axis direction, and into which the magnet is inserted,

the rotor includes: a first end plate arranged on one end surface of the rotor core, and a second end plate arranged on the other end surface of the rotor core,

the magnet includes an outer circumferential surface contacting the magnet insertion portion of the rotor core,

the magnet insertion portion includes a protrusion portion 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 protruding toward the magnet,

the protruding portion includes: a top portion contacting the outer circumferential surface of the magnet, and a separation portion separated from the outer circumferential surface of the magnet.

2. The motor of claim 1,

the outer peripheral surface of the magnet includes: an inner side surface formed on the shaft hole side; an outer side surface that is longer in distance from the shaft hole than from the shaft hole to the inner side surface; and a first contact surface provided at one end of the inner surface, that is, a first end extending parallel to the rotation axis direction,

the first contact surface is in contact with the top portion.

3. The motor of claim 2,

the outer peripheral surface of the magnet further includes a second contact surface provided at the other end portion of the inner side surface, i.e., a second end portion extending in parallel with the first end portion,

the protruding portion includes: a first protrusion having the top portion and the separation portion, and a second protrusion having the top portion and the separation portion,

the first contact surface is in contact with the top of the first protrusion,

the second contact surface is in contact with the top of the second protrusion.

4. The motor of claim 1,

the outer peripheral surface of the magnet includes: an inner side surface formed on the shaft hole side; an outer side surface that is longer in distance from the shaft hole than from the shaft hole to the inner side surface; and a third contact surface provided at one end of the outer surface, that is, a third end extending parallel to the rotation axis direction,

the third contact surface is in contact with the top portion.

5. The motor of claim 4,

the outer peripheral surface of the magnet further includes a fourth contact surface provided at a fourth end portion extending in parallel with the third end portion, which is the other end portion of the outer side surface,

the protruding portion includes: a third protrusion having the top and the separation portion, and a fourth protrusion having the top and the separation portion,

the third contact surface is in contact with the top of the third protrusion,

the fourth contact surface is in contact with the top of the fourth protrusion.

6. The motor of claim 1,

the outer peripheral surface of the magnet includes: an inner side surface formed on the shaft hole side; an outer side surface that is longer in distance from the shaft hole than from the shaft hole to the inner side surface; a first contact surface provided at one end of the inner surface, that is, a first end extending parallel to the rotation axis direction; a second contact surface provided at the other end of the inner surface, that is, a second end extending parallel to the first end; a third contact surface provided at one end of the outer surface, that is, a third end extending parallel to the rotation axis direction; and a fourth contact surface provided at a fourth end portion extending in parallel with the third end portion, which is the other end portion of the outer side surface,

the protruding portion includes: a first tab having the top and the separation, a second tab having the top and the separation, a third tab having the top and the separation, and a fourth tab having the top and the separation,

the first contact surface is in contact with the top of the first protrusion,

the second contact surface is in contact with the top of the second projection,

the third contact surface is in contact with the top of the third protrusion,

the fourth contact surface is in contact with the top of the fourth protrusion.

7. The motor of claim 1,

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 a plate-like third core piece provided between the first core piece and the second core piece,

the first core piece and the second core piece are formed with the protruding portion,

the third ferrite piece includes an inner peripheral surface disposed between the protruding portion of the first ferrite piece and the protruding portion of the second ferrite piece,

the inner peripheral surface of the third core piece is separated from the outer peripheral surface of the magnet.

8. The motor according to any one of claims 1 to 7,

the magnet is of a split type.

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