JP2013038872A - Rotary electric machine rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable imbalance of a rotary electric machine rotor to be reliably adjusted with a smaller number of steps.SOLUTION: A rotary electric machine rotor 10 comprises: a rotational shaft 12; a rotor core 14 in which permanent magnets are buried and disposed; a flange part 20 which is a connection member connecting the rotational shaft 12 with the rotor core 14; and a balance weight 40. The flange part 20 includes a shaft holding part 24 having a center hole 22 in a center portion in which the rotational shaft 12 is fixed thereto, and includes a core holding part 26 which holds the rotor core 14 in an outer peripheral side. A hub part 28 between the shaft holding part 24 and the core holding part 26 is a circular hollow 32 from a viewpoint of the whole flange part 20. The hollow 32 is used as a balance weight attachment part in which balance weights 40 and 44 are fitted therein.

Description

  The present invention relates to a rotating electrical machine rotor, and more particularly, to a rotating electrical machine rotor including a balance weight.

  A rotor called a rotor of a rotating electrical machine does not rotate smoothly if there is a deviation in mass or the like with respect to the center of rotation. Therefore, in order to correct the bias, a part of the rotor is shaved or an additional mass is added to a part of the rotor.

  For example, in Patent Document 1, as a balance structure of a rotor, a plurality of balance weight mounting holes are provided in end plates arranged at both axial ends of the rotor body, and the balance weight fitting site is fitted into the mounting holes. It is disclosed.

  Patent Document 2 discloses using a metal end plate having a bent portion as a kind of flange as a rotor manufacturing method. Here, a metal end plate and a shaft are press-fitted and fixed, a steel plate portion B having a large inner diameter is disposed at a bent portion of the metal end plate, and a steel plate portion A having a small inner diameter is disposed on the outer periphery of the shaft. Deploy. These are placed in a mold, and an end plate-like resin end plate is formed on the axial end side of the steel plate portion A by injection molding, and an annular shape is formed on the outer diameter side of the bent portion of the metal end plate. A resin end plate is formed, and a filling portion connected to the end plate-like end plate is formed between the metal end plate and the steel plate portion A. It is stated that this makes it possible to form an integrated rotor core without caulking the electrical steel sheet.

  In Patent Document 3, in a DC brushless motor used for a hermetic compressor, a sleeve having a lower flange for a balance weight and a shaft are shrink-fitted, the lower side is supported by the lower flange, and an annular shape is formed on the outer peripheral side of the sleeve. A configuration is disclosed in which a ferrite magnet is arranged, an upper flange for a balance weight is arranged on the upper side of the annular ferrite, and these are fixed in the axial direction by bolts.

  Patent Document 4 describes a configuration in which a magnet is disposed on the outer periphery of a rotor and has a magnet rotor having a hollow portion, and a cylindrical spacer member provided inside the magnet rotor. Here, an opening is provided on one end face of the spacer member, and a balance correction hole extending from the opening to the other end face along the axial direction is provided. And it is disclosed that the putty which is a balance correction material is inserted toward the balance correction hole from the opening.

JP 2005-218293 A JP 2006-115659 A Japanese Patent Laid-Open No. 61-277348 JP 2004-15871 A

  As described above, the rotor unbalance adjustment is roughly divided into a method of scraping a part of a part and a method of attaching a balance weight. In the former partial scraping method, the strength of the shaved portion is insufficient, or conversely, the strength of the portion that is not ground is excessive. Moreover, it takes time and effort to cut, and chips that become residue are generated. In the latter balance weight attachment method, when the balance weight is standardized, the number of balance weight attachments does not become constant depending on the degree of unbalance, so the number of assembly steps increases and decreases. In addition, when putting putty is used as a balance weight, it is easy to cope with variations in unbalance, but it takes time to harden the putty. Further, when the rotor rotates, the attached balance weight may come off and fly off.

  The objective of this invention is providing the rotary electric machine rotor which can adjust an unbalance more reliably with few man-hours.

  The rotating electrical machine rotor according to the present invention includes a rotating shaft, a rotor core fixedly disposed on the outer diameter side with respect to the rotating shaft, and a position on the outer diameter side of the rotating shaft and on the inner diameter side of the rotor core. A balance weight mounting portion provided with a mounting space for mounting the balance weight, and a balance weight fixed to the balance weight mounting portion, having an outer shape corresponding to the shape of the mounting space of the balance weight mounting portion, And an integrated balance weight whose mass center is previously biased.

  The rotating electrical machine rotor according to the present invention further includes a flange portion having a center hole for attaching the rotation shaft to the center portion and a core holding portion for holding the rotor core on the outer peripheral side. It is preferable to be provided.

  In the rotating electrical machine rotor according to the present invention, the balance weight mounting portion is a hub portion that is annularly recessed between the center portion of the flange portion and the holding portion, and the balance weight is in the annular recess of the hub portion. It is preferable that the annular member is arranged and fixed.

  With the above configuration, the rotating electrical machine rotor is provided with a balance weight mounting portion at a position on the outer diameter side of the rotation shaft and on the inner diameter side of the rotor core, and has an outer shape corresponding to the shape of the mounting space of the balance weight mounting portion. And an integrated balance weight whose mass center is biased in advance. Thereby, balance adjustment can be reliably performed by a simple method of arranging the integrated balance weight in the mounting space.

  Further, in the rotating electrical machine rotor, a flange portion having a center hole for attaching the rotation shaft to the center portion and having a core holding portion for holding the rotor core on the outer peripheral side is used, and the balance weight attaching portion is provided on the flange portion. Thereby, balance adjustment can be performed using a flange part effectively.

  In the rotating electrical machine rotor, the balance weight mounting portion is a hub portion that is annularly recessed between the center portion of the flange portion and the holding portion, and the balance weight is disposed and fixed in the annular recess of the hub portion. It is an annular member. Since balance adjustment is performed by fixing the annular member to the annular recess, even if the rotor rotates, the annular member as the balance weight is unlikely to come off from the annular recess as the attachment space.

In embodiment which concerns on this invention, it is a figure which shows a mode that an integral balance weight is attached to a rotary electric machine rotor. It is sectional drawing of the rotary electric machine rotor of embodiment which concerns on this invention. In embodiment which concerns on this invention, it is a figure which shows the other integrated balance weight. It is a figure which shows the example which performs balance adjustment by drilling in a rotor core in a prior art. In a prior art, it is a figure which shows the example which adds a balance weight to a rotor core and performs balance adjustment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Hereinafter, a configuration having a rotating shaft, a flange portion, and a rotor core as a rotor of the rotating electrical machine will be described. This is an exemplary configuration for explanation, and the rotor core is disposed on the outer side of the rotating shaft. Any configuration is acceptable, a configuration in which the flange portion is integrated with the rotating shaft, a configuration in which the flange portion is integrated with the rotor, a configuration in which the rotating shaft and the rotor core are integrated, a configuration in which other elements are added in addition to the flange portion, etc. It may be.

  In the following, the rotating electrical machine rotor is described as having a configuration in which the permanent magnet is embedded in the rotor core. However, this is an example for explanation, and even if the permanent magnet is configured on the outer peripheral surface of the rotor core. The configuration may be a reluctance type rotor core in which the magnetic resistance is periodically changed along the circumferential direction of the rotor core without using a permanent magnet. In addition, although a laminate of electromagnetic steel sheets is described as the rotor core, this is an illustrative example, and an integrated rotor core using sintered magnetic powder or the like may be used.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  1 and 2 are views showing the rotating electric machine rotor 10, FIG. 1 is a perspective view showing a state when the balance weights 40 and 44 are attached, and FIG. 2 is a rotation view with the balance weight 40 attached. 2 is a cross-sectional view of the electric rotor 10. FIG.

  The rotating electrical machine rotor 10 is one of the members constituting the rotating electrical machine, and is disposed in a hole on the inner peripheral side of an annular rotating electrical machine stator that is fixedly attached to a case of the rotating electrical machine. The case is rotatably supported. A coil is wound around the rotating electric machine stator, and the rotating electric machine rotor 10 is provided with a magnet (not shown). The rotating electrical machine rotor 10 rotates with respect to the rotating electrical machine stator by the cooperation of the magnetic field generated by energizing the coils of the rotating electrical machine stator and the magnet of the rotating electrical machine rotor.

  The rotating electrical machine rotor 10 includes a rotating shaft 12, a rotor core 14 (not shown) in which a permanent magnet is embedded, a flange portion 20 that is a member connecting the rotating shaft 12 and the rotor core 14, and a balance weight. 40 is comprised.

  The rotating shaft 12 is a shaft member that serves as an output shaft of the rotating electrical machine when configured as a rotating electrical machine. The rotor core 14 includes an annular core body 16 in which a plurality of electromagnetic steel plates are laminated, and both end sides along the axial direction of the core body 16, and also includes annular end plates 18 and 19. The end plates 18 and 19 are configured as a rotating electric machine, and when the rotating electric machine rotor 10 rotates, a function of sandwiching the core body 16 in the axial direction so that the laminated electromagnetic steel plates are not separated by a centrifugal force or the like. Have

  Although not shown in FIGS. 1 and 2, a plurality of permanent magnet insertion holes are disposed in the core body 16 along the circumferential direction. Each permanent magnet insertion hole is extended and opened along the axial direction, and a permanent magnet is inserted in the permanent magnet insertion hole.

  The flange portion 20 is an annular member having a shaft holding portion 24 having a center hole 22 for attaching the rotating shaft 12 to the center portion and having a core holding portion 26 for holding the rotor core 14 on the outer peripheral side. The shaft holding unit 24 has a predetermined holding length along the axial direction in order to hold the rotating shaft 12. Similarly, the core holding portion 26 has a predetermined holding length longer than the thickness along the axial direction of the rotor core 14 in order to firmly hold the inner peripheral side of the annular rotor core 14.

  In the flange portion 20, the hub portion 28 between the shaft holding portion 24 and the core holding portion 26 is a disc portion having an appropriate thickness. The shaft holding portion 24 has a predetermined holding length along the axial direction, and the core holding portion 26 also has a predetermined holding length along the axial direction, but the hub portion 28 is necessary in terms of strength. What is necessary is just to have thickness. Accordingly, when viewed as a whole of the flange portion 20, the hub portion 28 becomes an annular recess 32 between the shaft holding portion 24 at the center of the flange portion 20 and the core holding portion 26 on the outer peripheral side.

  The recess 32 functions as a mounting space in which the balance weights 40 and 44 are fitted and fixed. That is, the recess 32 is used as a balance weight attaching portion for attaching the balance weights 40 and 44. The balance hole 30 shown in FIGS. 1 and 2 is a hole that is opened in advance in order to facilitate balance adjustment of the rotating electrical machine rotor 10.

  Here, the balance adjustment is configured as a rotating electric machine, and when the rotating electric machine rotor 10 rotates, when the rotation is uneven due to mass deviation around the central axis of the rotating shaft 12, The balance weights 40 and 44 are attached and adjusted so that the non-uniform rotation becomes a uniform rotation. The balance hole 30 is used to compensate for the mass deviation in advance when the rotary electric machine rotor 10 is designed to be completely symmetrical around the central axis of the rotary shaft 12 before the balance weights 40 and 44 are attached. Is provided. The balance hole 30 is provided in the hub portion 28 corresponding to the recess 32 as an oval hole at a position eccentric from the position of the central axis. The balance hole 30 is also used as a mark for positioning a mass-biased portion when the balance weights 40 and 44 are fitted into the recess 32. In some cases, the balance hole 30 can be omitted.

  The balance weights 40, 44 are integral members having an outer shape corresponding to the shape of the recess 32, which is a mounting space for the balance weight mounting portion, with the center of mass biased in advance. The integral type means that a single balance member is used instead of a single balance weight, and a single member is used.

  Since the recess 32 has an annular shape, the balance weights 40 and 44 are plate members having an annular outer shape. When the indentation 32 has an annular shape other than an annular shape, the balance weights 40 and 44 also have an outer shape corresponding to the annular shape. For example, when the indentation 32 has a polygonal outer peripheral shape and an annular shape with a circular inner periphery, the balance weights 40 and 44 also have an outer shape that can be fitted into the indentation 32.

  Regarding the fitting, the outer shape of the balance weights 40 and 44 is set to be larger than the shape of the depression 32 so that it can be placed in the depression 32 by being pushed. Thereby, it is possible to prevent the balance weight fitted in the recess 32 from being displaced or detached.

  The balance weights 40 and 44 are a plurality of members having different mass center deviation amounts. The mass center deviation amount is the mass center deviation amount with respect to the central axis of the balance weights 40 and 44. In order to vary the amount of deviation of the center of mass, the balance weights 40 and 44 shown in FIG. 1 are provided with holes 42 and 46 in the annular plate material so that the center of mass is deviated from the position of the central axis. The sizes of the holes 42 and 46, that is, the amount of mass to be deleted are made different.

  In FIG. 1, two types of balance weights 40 and 44 having different mass center deviation amounts are shown. Of course, more types having different mass center deviation amounts can be provided. The balance adjustment is performed using one of a plurality of balance weights. In the example of FIG. 2, the balance weight 40 is selected and fitted into the recess 32 to perform balance adjustment. In some cases, the balance adjustment may be performed using a plurality of types of balance weights or using a plurality of balance weights of the same type.

  FIG. 3 is a diagram illustrating examples of other types of balance weights 50 and 54. The balance weights 50 and 54 cut out a part of the outer periphery of the annular plate material to cause a deviation in the center of mass. By making the sizes of the cutout shapes 52 and 54 different, it is possible to obtain different mass center deviation amounts.

  4 and 5 are diagrams showing a balance adjustment method in the prior art. In FIG. 4, an appropriate number of drill holes 64, 66, 68 are formed in the rotor core 14 as the balance adjusting means 62. In this method, the strength of the rotor core 14 may be insufficient. In order to prevent this, if the portion where the balance adjusting means 62 may be provided is designed to be thick in advance, or if the entire portion is designed to be thick in advance, the strength is excessive for the thick portion. Moreover, in order to cut the rotor core 14, equipment capable of precision machining is required. Further, since the unbalance amount is different in each rotating electric machine rotor 10, the number of the drilling holes 64, 66, 68 or the hole diameter may be different, and the processing time for balance adjustment is not constant. Furthermore, since the chips generated when opening the cutting holes 64, 66, 68 become residues, a device for sucking out is required.

  FIG. 5 is a diagram illustrating an example in which the balance adjustment is performed by providing additional masses 74, 76, and 78 as the balance adjusting means 72 in the rotor core 14. The additional masses 74, 76, 78 can be formed by depositing an appropriate putty material. In this method, the amount of unbalance differs among the individual rotating electrical machine rotors 10, so the size and quantity of the additional masses 74, 76, and 78 are not constant. In addition, when putting putty materials, it takes time for the putty materials to cure. Moreover, when the rotary electric machine rotor 10 comprised as a rotary electric machine rotates, additional mass 74,76,78 may detach | leave from the rotor core 14 with a centrifugal force, and may scatter.

  On the other hand, according to the configuration described with reference to FIGS. There is no generation of chips. The strength of the rotor core 14 does not become insufficient or excessive. By preparing multiple balance weights with different mass deviations, balance adjustment can be completed with a certain number of balance weights even when the unbalance amount of each rotating electrical machine rotor 10 is different. Become. Further, since the balance adjustment is performed by firmly fitting the balance weight into the recess 32, the balance weight is not detached from the recess 32 by centrifugal force when the rotating electrical machine rotor 10 configured as a rotating electrical machine rotates. Therefore, it does not scatter.

  The rotating electrical machine rotor according to the present invention can be used for a rotating electrical machine mounted on a vehicle.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine rotor, 12 Rotating shaft, 14 Rotor core, 16 Core main body, 18, 19 End plate, 20 Flange part, 22 Center hole, 24 Shaft holding part, 26 Core holding part, 28 Hub part, 30 Balance hole, 40 , 44, 50, 54 Balance weight, 42, 46 hole, 52, 54 Notch shape, 62, 72 Balance adjusting means, 64, 66, 68 Drilled hole, 74, 76, 78 Additional mass.

Claims (3)

A rotation axis;
A rotor core fixed on the outer diameter side with respect to the rotation shaft;
A balance weight mounting portion provided at a position on the outer diameter side of the rotation shaft and on the inner diameter side of the rotor core, and having a mounting space for mounting the balance weight;
A balance weight that is fixed to the balance weight mounting portion, has an outer shape corresponding to the shape of the mounting space of the balance weight mounting portion, and has an integrated balance weight that is preliminarily offset from the center of mass,
A rotating electrical machine rotor comprising: In the rotating electrical machine rotor according to claim 1,
The center portion has a center hole for attaching the rotation shaft, and includes a flange portion having a core holding portion for holding the rotor core on the outer peripheral side,
The rotating electrical machine rotor, wherein the balance weight mounting portion is provided on the flange portion. The rotating electrical machine rotor according to claim 2,
The balance weight mounting portion is a hub portion that is recessed in an annular shape between the center portion of the flange portion and the holding portion,
The rotating electrical machine rotor, wherein the balance weight is an annular member disposed and fixed in an annular recess of the hub portion.

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