JP5128840B2 - Manufacturing method of embedded permanent magnet rotor and embedded permanent magnet rotor using the manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a permanent magnet embedded rotor for an electric motor used in a hermetic compressor, and a permanent magnet embedded rotor using the manufacturing method.

  A conventional rotor has a rotor structure as shown in Patent Document 1 (Japanese Utility Model Laid-Open No. 5-18246). This application is shown in FIG. The rotor 90 is composed of a rotor core 10 in which thin electromagnetic steel plates are laminated. A permanent magnet 20 is attached to the outer peripheral portion of the laminated rotor core 10 and a can 50 is fitted over the permanent magnet 20. The end plates 40a and 40b are arranged from both sides of the laminated rotor core 10, the caulking pin 80 is inserted into a through hole penetrating the rotor core 10, and the caulking pin 80 is extended to one end side in the rotor axial direction. By attaching the oil separator 70 via the opening, an opening 300b is provided between the oil separator 70 and the end plate 40a.

  As a result, the mixed gas containing the refrigerant and the refrigerating machine oil wound up from the compression mechanism in the hermetic compressor is brought into contact with the oil separator 70 and the rotor circle from the opening 300b opened between the end plate 40a and the oil separator 70. The refrigerating machine oil is separated by being blown in the circumferential direction so that the refrigerating machine oil returns to the oil sump portion, so that the refrigerating machine oil is rolled up so as not to flow out of the discharge pipe in the compressor to the refrigerant circuit.

Japanese Utility Model Publication No. 5-18246

  However, end plates 40a and 40b are arranged on both sides of the rotor core 10 laminated as shown in FIG. 5, and caulking pins 80 are inserted into through holes penetrating the rotor core 10, and caulking pins 80 are arranged on one end side in the rotor axial direction. In the permanent magnet surface rotor 90 in which the opening 300b is provided between the oil separator 70 and the end plate 40a via the spacer 60, the opening 300b is provided between the end plate 40a and the oil separator 70. Therefore, a spacer 60 is inserted into the caulking pin 80. As described above, in the permanent magnet surface rotor 90 of FIG. 5, the spacers 60 are inserted into the caulking pins 80 one by one, which is troublesome and poor in workability. Of course, the material cost as a separate member of the spacer 60 is also involved. Further, since the caulking pin 80 protrudes from the end plate 40a, the caulking pin 80 is easily bent.

  In view of this, the present invention relates to a method for manufacturing a permanent magnet embedded rotor that has good workability and can reduce material costs with respect to the installation of an oil separator in a permanent magnet embedded rotor, and a permanent using the manufacturing method. A magnet embedded rotor is provided.

The present invention is a rotor of an electric motor mounted on a hermetic compressor that compresses a mixed gas containing refrigerant and refrigerating machine oil, and the rotor is composed of a rotor core in which thin electromagnetic steel plates are laminated, and the rotor The iron core is provided with a magnet housing hole for inserting a permanent magnet from the rotor axial direction. After inserting the permanent magnet into the magnet housing hole, both ends of the rotor core in the axial direction are covered with end plates. At least one of the axial ends of the rotor core is provided with a balance weight for correcting the unbalance amount of the compression mechanism having an eccentric portion eccentrically around at least one of the axial ends of the rotor core. In the permanent magnet embedded rotor in which the oil separator for separating the refrigerating machine oil from the refrigerant compressed by the compression mechanism is attached and fixed integrally by a plurality of fastening members,
Fastening member has been made to the fastening to the side where the oil separator is attached by caulking together with the inserted oil separator side in the opposite direction to the rotor core,
The oil separator is provided with a permanent magnet embedded rotor in which a cutout portion provided in the oil separator is provided at at least one position on the oil separator side facing the fastening portion where the balance weight is not fastened by the fastening member. And a manufacturing method of a permanent magnet embedded rotor in which a fastening jig for a fastening member is inserted and fastened integrally from the notch, and a permanent magnet embedded rotor using the manufacturing method.

  By using the method for manufacturing an embedded permanent magnet rotor according to the present invention, a mixed gas containing refrigerant and refrigerating machine oil is coated with end plates that cover both axial ends of the rotor core, and the rotor shaft of the compression mechanism section. Balance weight attached to at least one of axial ends of the rotor core and oil attached on at least one balance weight to correct the unbalance amount of the eccentric part eccentric about the center. By making the separator and the permanent magnet embedded rotor integrated in the fastening member, an opening can be provided between the end plate and the oil separator without using an extra spacer, thereby reducing material costs. The work of passing the spacer through the fastening member can also be reduced.

  Furthermore, the length of the fastening member can be shortened by providing a notch portion in which the oil separator is notched on the oil separator side facing the fastening portion of the fastening member to which the balance weight is not fastened. As a result, when the fastening member is fixed, the fastening member does not protrude from the end of the rotor, so that the fastening can be performed stably, and the fastening member does not buckle. In addition, this notch part may be a notch part notched concavely from the outer diameter of the oil separator, or a shape having a hole from the rotor axial direction of the oil separator.

  On the other hand, since it has a notch structure in which the oil separator is cut out, a jig for fixing the fastening member can be inserted up to the end of the rotor core (position where the end plate is mounted). Can be fixed stably and easily. Thereby, the buckling defect of a fastening member can be reduced.

  The present invention will be described with reference to the drawings. FIG. 1 shows a cross-sectional view of a hermetic compressor equipped with a permanent magnet embedded rotor 9 of this embodiment.

  The main structure of the compressor 100 is a compressor 100 including a compression mechanism unit 102, an accumulator 103, a stator 110, and a rotor 9 (permanent magnet embedded rotor). The compression mechanism unit 102 and the electric motor are disposed inside the sealed container 101, and the sealed container 101 is provided with a suction pipe 105 and a discharge pipe 104. The mixed gas containing the refrigerant and the refrigerating machine oil compressed by the compression mechanism unit 102 includes a passage 110a (hole, notch) formed in the stator 110 and a passage 9a (hole, notch) provided in the rotor 9. Part), the gap 110b (gap) between the stator 110 and the rotor 9 and the like, and the like.

  In particular, in the type of the compressor 100 shown in FIG. 1 installed in the vertical type, if the mixed gas containing the refrigerating machine oil is discharged from the discharge pipe 104 as it is, the refrigerating machine oil in the sealed container 101 disappears and the compression mechanism. Lubrication of the part 102 is deteriorated, and the temperature rises and the compression mechanism part 102 is seized. Therefore, an oil separator 7 is attached to the rotor 9 and the like so as to separate the refrigerant and the refrigeration oil so that the mixed gas containing the refrigeration oil is not discharged from the discharge pipe 104 of the compressor 100 as much as possible.

  In the oil separator 7, a mixed gas containing refrigerant and refrigerating machine oil compressed by the compression mechanism 102 in the compressor 100 is provided in the rotor 9 from the lower part of the electric motor, and the gap between the passage 9 a and the stator 110 and the rotor 9 is provided. After ascending through 110b and hitting the oil separator 7, the rotor 9 rotates to be centrifuged in the circumferential direction of the rotor 9 and separated into refrigerant and refrigerating machine oil. The refrigerating machine oil thus separated returns to the oil sump section 106 from the passage 110a provided in the stator 110 or the like.

  In this way, the oil separator 7 attached to the rotor 9 is rotated so as to be centrifugally separated and the refrigerant and the refrigerating machine oil are blown in the circumferential direction of the rotor 9, so that the end plates attached to the oil separator 7 and the rotor core 1 are used. It is necessary to provide an opening 300a that opens in the direction of the outer diameter of the rotor.

FIG. 2 shows a permanent magnet embedded rotor 9 according to this embodiment.
The embedded permanent magnet rotor 9 shown in FIG. 2 comprises a rotor iron core 1 formed by laminating thin electromagnetic steel plates. The rotor core 1 is provided with a permanent magnet accommodation hole 3 penetrating in the axial direction of the rotor core 1 so that the permanent magnet 2 can be inserted in the axial direction of the rotor core 1. After the permanent magnet 2 is inserted into the permanent magnet accommodation hole 3 of the rotor core 1, end plates 4 a and 4 b are arranged so as to close both ends of the rotor core 1.

  The compression mechanism 102 of the compressor 100 has an eccentric rotor that is driven by the rotation shaft 500. In order to correct the unbalance amount of the eccentric rotor of the rotating shaft 500, a balance weight 400a is attached on the end plate 4a attached to the rotor core 1. Thereby, the unbalance amount of the eccentric rotor driven by the rotating shaft 500 can be corrected.

  On the end face of the balance weight 400a, the mixed gas containing the refrigerant compressed by the compression mechanism 102 of the previous compressor 100 and the refrigerating machine oil is not ejected and discharged directly to the refrigerant circuit outside the compressor 100. Thus, an oil separator 7 is attached. As a result, the mixed gas containing the refrigerant and the refrigerating machine oil wound up by the rotation of the rotor 9 collides with the oil separator 7, and the outer diameter direction of the rotor 9 provided between the balance weight 400 a and the oil separator 7. The refrigerant and the refrigerating machine oil are centrifuged by being blown off in the circumferential direction from the opening 300a that is opened to the center. Thereafter, the refrigerating machine oil returns to the oil sump section 106 from a passage 110a provided in the stator 110 and the like.

  In order to integrate the thus configured rotor 9, fastening members 8 a to 8 d are inserted into through holes provided in the rotor 9 from the anti-oil separator side and fastened on the oil separator 7 side. In this case, when caulking pins are used as the fastening members 8a to 8d, the caulking pins are inserted from the anti-oil separator side and caulked on the oil separator 7 side to be integrally fixed. As a result, when fastening the fastening members 8a to 8d, the temporary core integrated with the fastening jig base 201 from the anti-oil separator side is prevented so that the inner diameter of the rotor core 1 does not fall down and the rotary shaft 500 cannot be inserted. The shaft 510 can be inserted to fasten the fastening members 8a to 8d. By doing so, the temporary shaft 510 can be inserted without the oil separator 7 interfering. After the fastening members 8a to 8d are fastened, the temporary shaft 510 integrated with the fastening jig base 201 can be pulled out. (See Figure 4)

  The oil separator 7 has a circular shape that does not protrude from the outer peripheral shape of the rotor 9, and the oil separator 7d is not fastened to the balance weight 400a on the oil separator side. 7 is provided with a notch 7a. The notch 7a may have a concave shape cut out from the outer diameter of the oil separator 7 or a hole shape cut out from the rotor axial direction of the oil separator 7. By doing in this way, a fastening jig can be inserted from the notch part 7a provided in the oil separator 7, and the fastening member 8d can be stabilized and fastened. A plurality of the notches may be provided. It depends on the fixed position and method of the balance weight 400a.

  FIG. 3 is a view of the embedded permanent magnet rotor 9 shown in FIG. An end plate 4a is attached to the end of the rotor core 1, and an oil separator 7 is placed on the balance weight 400a and fastened by fastening members 8a to 8d. 2 and 3, the length of the fastening members 8a to 8d is different from the length when the balance weight 400a is fixed to the rotor core 1 and the length when the balance weight 400a is not fixed. Yes. The outer diameter of the oil separator 7 at the position of the fastening member 8d to which the balance weight 400a is not fixed, that is, at the fastening location where the fastening member 8d directly fastens the end plate 4a attached to the end of the rotor core 1. A notch portion 7a that is notched in a concave shape is provided.

  As a result, the fastening member 8d does not protrude from the end plate 4a attached to the end of the rotor core 1, so that when the fastening member 8d is fixed, it becomes unstable and the fastening member 8d does not buckle. Further, the length of the fastening member 8d can be shortened, no extra member such as an extra spacer is required, and the length of the fastening member itself can be shortened, so that the material cost can be reduced.

In order to achieve such a structure of the rotor 9, a fastening jig 200d for fastening the fastening member 8d is inserted and fastened from the notched portion 7a of the oil separator 7. Yes.
FIG. 4 shows the structure of the fastening jig 200d. Two fastening members 8a to 8c to which the balance weight 400a of the embedded permanent magnet rotor 9 shown in FIGS. 2 to 3 is fastened and one fastening member 8d to which the balance weight 400a is not fastened are respectively provided. Are fastened by fastening jigs 200a to 200d which are in a relative relationship with the fastening members.

  Four fastening jigs 200 a to 200 d protrude from the fastening jig base 202. The lengths protruding from the fastening jig base 202 are different. Three of the fastening jigs 8a to 8c having a relative relationship with the balance weight 400a are configured to be shorter than one of the fastening jigs 8d having a relative relationship with a position where the balance weight 400a is not fastened. The protruding length X of the fastening jig 200d from the fastening jig base 202 is substantially the same as the total length of the balance weight 400a and the oil separator 7.

  As shown in FIG. 4, the fastening jig 200d is inserted from a concave notch 7a provided in the oil separator 7, and fixes the fastening member 8d. As described above, since the difference is provided by the difference in height between the balance weight 400a and the oil separator 7, the four fastening members 8a to 8d of the embedded permanent magnet rotor 9 can be fixed simultaneously. . Accordingly, the fastening members 8a to 8d of the permanent magnet embedded rotor 9 can be fixed simultaneously without fixing them one by one, and the number of work steps can be greatly reduced. A plurality of notches may be provided. Depending on the fixing position and method of the balance weight 400a, the fastening positions of the fastening members 8a to 8d and the fastening method differ.

  The notch 7a of the oil separator 7 has a stator 110 after the permanent magnet 2 embedded in the permanent magnet housing hole 3 of the rotor core 1 of the embedded permanent magnet rotor 9 is incorporated in the hermetic compressor 100. When the magnet is magnetized as a magnetized yoke, it can be used as a mark groove for positioning the magnetization of the embedded permanent magnet rotor 9.

The figure explaining a hermetic compressor. The figure of the permanent magnet embedded rotor of this embodiment. The A arrow directional view of the permanent magnet embedded rotor of FIG. The figure for fastening a fastening member with a fastening jig. The figure of the conventional permanent magnet surface type rotor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,10 ... Rotor core 2, 20 ... Permanent magnet 3, 30 ... Permanent magnet accommodation hole 4a, 4b, 40a, 40b ... End plate 7, 70 ... Oil separator 7a ... Notches 8a to 8d, 80 ... Fastening member 9 ... Embedded permanent magnet rotor 9a ... Rotor passage 50 ... SUS pipe 60 ... Spacer 90 ... Permanent magnet surface Type rotor 100... Hermetic compressor 101... Hermetically sealed container 102... Compression mechanism 103... Accumulator 104 ... discharge pipe 105 ... suction pipe 106. .. Stator 110a ... Stator passage 110b ... Gap 200a-200d ... Fastening jigs 201, 202 ... Fastening jig bases 300a, 300b ... Openings 400a, 400b ... Balance weight 500 ... Rotation axis 510 ... temporary shaft

Claims (2)

In the rotor of an electric motor mounted on a hermetic compressor that compresses a mixed gas containing refrigerant and refrigeration oil, the rotor is composed of a rotor core in which thin electromagnetic steel plates are laminated, and the rotor core is permanent. A magnet housing hole for inserting a magnet from the rotor axial direction is provided, and after inserting a permanent magnet into the magnet housing hole, both axial end portions of the rotor core are covered with end plates, and the rotor is a part of the compression mechanism section. A balance weight is attached to at least one of the axial ends of the rotor core in order to correct the unbalance amount of the eccentric portion eccentric about the rotor axis.
In at least one of the balance weights, an oil separator for separating the refrigerating machine oil from the refrigerant compressed by the compression mechanism is attached, and the permanent magnet embedded rotor in which they are integrally fixed by a plurality of fastening members ,
The fastening member, to the side of the oil separator is mounted be one fastened by caulking together with inserted from the side opposite to the rotor core the oil separator side,
The oil separator is provided with at least one cutout portion on the oil separator facing the fastening portion where the balance weight is not fastened by the fastening member ,
A manufacturing method of a permanent magnet embedded rotor, wherein a fastening jig is inserted from the notch portion and crimped integrally with the fastening member. A permanent magnet embedded rotor manufactured by using the manufacturing method according to claim 1.

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