JP5982776B2 - Permanent magnet type rotating electrical machine rotor - Google Patents

Description

  The present invention relates to an assembly structure of a rotor of an inner rotor type permanent magnet type rotating electrical machine intended for an SPM motor (Surface Permanent Magnet Motor).

  As is well known, the rotor of an SPM motor has permanent magnets (square blocks) corresponding to a predetermined number of poles along the circumferential direction on the outer peripheral surface of a laminated core of electromagnetic steel plates or a rotor core integrated with a shaft. In order to prevent permanent magnets from peeling off and scattering from the rotor core during operation of the rotating electrical machine due to poor adhesion, etc. In addition to the method of surrounding the permanent magnets affixed to the outer surface of the rotor and winding the binding tape such as glass tape around the outer peripheral surface of the rotor and tightening it, An assembly structure of a provided rotor is known (see Patent Document 1 and Patent Document 2).

  Here, in the assembly structure disclosed in Patent Document 1, a permanent magnet is disposed on the outer peripheral edge of the core plate located at both axial ends of the permanent magnet with respect to the rotor core configured by a laminated body of core plates (magnetic steel plates). A T-shaped locking piece protruding between adjacent permanent magnets is integrally provided in accordance with the arrangement pitch, and both ends of the permanent magnet are held by this locking piece to prevent scattering of the magnet.

  In Patent Document 2, a dovetail-shaped slit groove is formed along the axial direction on the outer peripheral surface of the rotor yoke in accordance with the arrangement pitch of the permanent magnets, and then a magnet scattering prevention fastener inserted into the slit groove. The permanent magnet is locked and fixed in the centrifugal force direction and the torque direction via (non-magnetic material).

JP 2004-153913 A JP 2005-176572 A

By the way, the conventional magnet scattering prevention means disclosed in the above-mentioned Patent Documents 1 and 2 have the following drawbacks in the production of the rotor, the processing of parts during assembly, and workability.
That is, in the assembly structure of Patent Document 1, the T-shaped locking piece is formed on the periphery of the core plate in accordance with the arrangement pitch of the permanent magnets with respect to the rotor core that is a laminated body of the core plates. Production costs increase due to the need for complicated punching plates, extensive press processing equipment, and labor-intensive assembly work and man-hours.

  Also, in the assembly structure of Patent Document 2, in order to form a dovetail-shaped slit groove for inserting and locking the anti-scattering fastener on the peripheral surface of the rotor yoke, a cutting work facility and an ant that takes time and labor are required. In addition to the groove cutting operation, a laborious operation is also required in the assembly process when the permanent magnet is mounted on the rotor yoke.

  The present invention has been made in view of the above points, and its object is to solve the above-mentioned problems and improve the assembly workability as compared with the conventional structure, while positioning the permanent magnets arranged on the circumferential surface of the rotor core in place. It is an object of the present invention to provide a rotor assembly structure of a permanent magnet type rotating electrical machine that is stably positioned and maintained to improve reliability and reduce manufacturing costs.

To achieve the above object, according to the present invention, the outer peripheral surface of the rotor core, a permanent magnet of the inner rotor type, which is fixed predetermined number of poles of the permanent magnet is juxtaposed arranged at equal intervals along the circumferential direction thereof In rotating electrical machines,
Provided on the outer peripheral surface of the rotor core, in accordance with the arrangement pitch of the permanent magnet, and the magnet retainer made of a metal protrusion piece extending along its axial direction, in the longitudinal direction of the magnet detent member is shape formed at a plurality of positions along the side edges, a concave groove which is welded to the peripheral surface of the Russia stator core, affixed with an adhesive to said rotor core and instrumentation fit therebetween of the magnet detent member Based on the assembly structure (Claim 1) provided with the permanent magnet , specifically, the rotor is assembled and configured in the following manner.

(1) In the magnet detent member, the concave groove is formed by being distributed to the left and right side edges of the magnet detent member (claim 2).
(2) the magnet detent member Ru Ah in projection piece of the non-magnetic metal material (claim 3).
(3) the surrounding said permanent magnets are arranged fixed to the peripheral surface of the rotor core Ru provided a bind tape to Tightened put come wound on the peripheral surface (claim 4).
(4) The rotor core is integral with the shaft, and is provided on the shaft, and is provided with a bowl-shaped magnet retaining step that protrudes from the front and rear ends of the rotor core to the outer peripheral side to restrain and hold the permanent magnet in the axial direction. (Claim 5).
(5) The magnet detent member, and the height of the magnet retaining step portion, Ru der than 1/2 of the maximum thickness of the permanent magnet (claim 6).

According to the assembly structure of the rotor described above, the following effects can be obtained.
(1) By providing a magnet detent member which becomes a metal protrusion on the peripheral surface of the rotor core in accordance with the arrangement pitch of the permanent magnets, this magnet detent member functions as a spacer between the permanent magnets. Thus, it is possible to reliably prevent the permanent magnet from being displaced in the torque direction in combination with the positioning of the permanent magnet to be mounted on the core peripheral surface.

  In addition, when the permanent magnet is mounted, it is only necessary to spread the magnet coated with an adhesive between adjacent magnet rotation-preventing members from the outer peripheral side of the core. Compared to the rotors of the conventional structure (Patent Documents 1 and 2), Compared with the method of sliding the permanent magnet from the axial direction to the T-shaped locking piece and the anti-scattering fastener, the assembly work is simple and efficient, and the core plate has a T-shaped locking piece (Patent Document 1). No need for pressing equipment, punching die, dovetail-shaped slit grooves (Patent Document 2) for inserting anti-scattering fasteners on the peripheral surface of the rotor core (Patent Document 2) Costs can be reduced and productivity can be improved.

 (2) In addition to the above-mentioned magnet detent member, by surrounding the permanent magnet of each pole affixed to the peripheral surface of the rotor core with an adhesive and winding the bind tape around the peripheral surface, the adhesive strength is increased. It is possible to prevent the permanent magnets from being accidentally scattered during operation due to the shortage. In addition, a hook-shaped magnet retaining step is provided on the outer periphery of the shaft with the shaft-integrated rotor core sandwiched from the front and back, thereby preventing the permanent magnet attached to the core peripheral surface from coming off in the axial direction. The permanent magnet can be stably held on the peripheral surface of the rotor core to ensure high reliability.

 (3) Here, the magnet anti-rotation member is welded by forming a concave groove at a plurality of locations on the side edge along the longitudinal direction and welding the concave groove portion to the circumferential surface of the rotor core. By preventing the fillet from protruding from the groove and obstructing the mounting and positioning of the permanent magnet, the groove is distributed and formed on the left and right edges of the magnet detent member so Deformation can be prevented and high positioning accuracy of the permanent magnet can be ensured.

 (4) Further, the magnet detent member and the magnet retainer stepped portion are set to have a projecting height that is ½ or less of the maximum thickness of the permanent magnet, so that the magnet detent member (steel material) Leakage magnetic flux between permanent magnets using the stop step as a magnetic path can be reduced. In addition, the magnetic flux leakage prevention member can be more effectively reduced by using a non-magnetic material for the magnet detent member.

It is a figure showing the assembly structure of the rotor of the permanent magnet type rotary electric machine by the Example of this invention, Comprising: (a) is a partial sectional side view, (b) is XX sectional drawing in (a). It is. FIG. 2 is a structural diagram of a shaft-integrated rotor core in FIG. 1, wherein (a) is a side view and (b) is a cross-sectional view taken along line XX in (a). FIG. 3 is an enlarged view of a magnet rotation preventing member in FIG. 2, where (a) is a plan view and (b) is an end view.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples shown in FIGS.
The rotor 1 in the illustrated embodiment is a rotor with a shaft-integrated structure in which a shaft 2 and a rotor core 3 are integrated. The shaft 3 is pivotally supported by a bearing 4, and the circumferential surface of the cylindrical rotor core 3 is circumferential. Six permanent magnets 5 in a rectangular block having a circular cross-section in the direction are arranged in the circumferential direction and 11 rows in the axial direction, and are attached with an adhesive (number of magnetic poles: 6 poles).

  Here, on the peripheral surface of the rotor core 3, a magnet detent member 6 that is a metal protrusion extending in the axial direction in accordance with the magnet arrangement pitch in the circumferential direction is welded. Is attached to the surface of the rotor core 3 by fitting a permanent magnet 5 coated with an adhesive between adjacent magnet detent members 6.

  Thereby, the permanent magnet 5 of each pole is correctly positioned and held at a predetermined arrangement position. Even when the adhesive strength of the permanent magnet 5 is reduced due to poor adhesion or the like, the permanent magnet 5 is restrained and held in the circumferential direction by the magnet detent member 6, so that the permanent magnet 5 is applied by a torque direction force applied during operation. Displacement does not idle.

  In the illustrated embodiment, the permanent magnets 5 of each pole are surrounded as a backup means for preventing the permanent magnets 5 attached to the rotor core 3 from being scattered due to centrifugal force during operation due to a decrease in the adhesive strength of the adhesive or the like. Then, a bind tape 7 (for example, a glass bind tape) is wound around the circumferential surface of the rotor so as to be tightened.

  Further, as a protective means for preventing the permanent magnet 5 affixed to the rotor core 3 from coming off in the axial direction, the shaft 2 of the illustrated embodiment projects from the both ends of the rotor core 3 to the outer peripheral side and faces the axial end surface of the permanent magnet 5. A bowl-shaped magnet retaining step 8 is integrally formed. The magnet retaining step 8 is formed integrally with the shaft 2 and can be implemented in place of another component such as a C-shaped retaining ring.

  Next, the detailed structure of the magnet detent member 6 will be described with reference to FIG. That is, the magnet detent member 6 is a strip-shaped strip piece (height (plate thickness): a≈3 mm, width: b≈5 mm) made of a non-magnetic material such as steel or aluminum, and its longitudinal length. Along the direction, concave and convex grooves 6a having a groove depth: c≈2 mm and a length: d≈10 mm are distributed and cut out at left and right side edges.

  And when this magnet rotation prevention member 6 is positioned and weld-joined to the surrounding surface of the rotor core 3, the said groove 6a is welded to the rotor core 3 by TIG welding method, for example. Thereby, the welding location can be correctly positioned using the concave groove 6a as a mark, and it is possible to prevent the weld fillet from protruding out of the concave groove 6a and hindering the positioning and sticking of the permanent magnet 6. In addition, by forming the concave grooves 6a alternately along the left and right side edges of the ridge piece, it is possible to effectively prevent warping and deformation of the magnet rotation preventing member accompanying welding.

  Moreover, about the protrusion height a (refer FIG.3 (b)) of this magnet detent | locking member 6, the permanent magnet 6 with which the side surfaces oppose each other in the circumferential direction on both sides of this magnet detent member (steel material) 6 is mutually. In order to reduce the leakage magnetic flux between them, the maximum thickness of the permanent magnet 5 (see FIG. 1B) attached to the peripheral surface of the rotor core 3 is D (D = 18 mm in the illustrated example), and less than half (a <1/2 · D) is set to about 3 mm. Note that the leakage flux can be more effectively reduced by using a non-magnetic material such as aluminum as the material of the magnet detent member 6.

  Further, for the same reason as described above, the magnet retaining step 8 formed at both axial ends of the rotor core also has an overhang height h (FIG. 2A) of the flange-shaped step 8 formed on the shaft 2 in the illustrated embodiment. Is set to about 5 mm which is 1/2 or less of the maximum thickness D of the permanent magnet 6 so as to suppress the leakage magnetic flux between the adjacent permanent magnets to be small.

  In the rotor of the illustrated embodiment, the magnet detent member 6 is welded to the peripheral surface of the shaft-integrated rotor core 3, but also for the rotor core that is a laminated body of core plates (electromagnetic steel plates), It can carry out by welding and joining the magnet detent | locking member used as a protrusion piece to the surrounding surface. Further, after the magnet rotation preventing member 6 is divided in the axial direction, a skew angle in the circumferential direction is set between them, and a step skew is applied between the permanent magnets 6 arranged in the axial direction so that the cogging torque of the rotating electrical machine is obtained. Can be reduced.

DESCRIPTION OF SYMBOLS 1 Rotor 2 Shaft 3 Rotor core core 4 Bearing 5 Permanent magnet 6 Magnet rotation prevention member 6a Concave groove 7 Binding tape 8 Magnet retaining step part

Claims (6)

The outer peripheral surface of the rotor core in its circumferential direction along fixed predetermined number of poles of the permanent magnet is juxtaposed equally spaced the inner rotor type permanent magnet type rotary electric machine,
Provided on the outer peripheral surface of the rotor core, in accordance with the arrangement pitch of the permanent magnet, and the magnet retainer made of a metal protrusion piece extending along its axial direction,
Said plurality of locations longitudinally along the side edges of the magnet detent member to be shape formed, groove which is welded to the peripheral surface of the Russia stator core,
The magnet detent member rotor of the permanent magnet type rotary electric machine, characterized in that by fitting instrumentation therebetween provided, and the permanent magnets which are glued to the rotor core. 2. The rotor according to claim 1, wherein the concave groove is formed by being distributed to the left and right side edges of the magnet detent member. 3. The rotor according to claim 1 or 2, wherein the magnet detent member is a non-magnetic metallic protrusion. The rotor according to claim 1,
The rotor of the permanent magnet type rotary electric machine in which the arranged fixed to the peripheral surface surrounds the permanent magnet, characterized in that a bind tape to Tightened put come wound on the peripheral surface of the rotor core. The rotor according to claim 1,
The rotor core is integral with the shaft;
Provided on the shaft, the rotor of the permanent magnet type rotary electric machine, characterized in that a collar-shaped magnet retaining stepped portion for restraining hold the permanent magnet in the axial direction protrudes from the front and rear end to the outer periphery of the rotor core . In the rotor according to any one of claims 1 to 5, wherein the magnet detent member, and the height of the magnet retaining step portion, said at half or less of the maximum thickness of the permanent magnet A rotor of a permanent magnet type rotating electrical machine.