JP2011125115A - Magnet-embedded rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnet-embedded rotary electric machine that solves a conventional problem, has a simple constitution and ensures low cost and stable magnetic property by being inserted with permanent magnets without damaging the permanent magnets. <P>SOLUTION: The magnet-embedded rotary electric machine has a stator formed of a plurality of winding structures, and a rotor formed by inserting the permanent magnets into insertion grooves of the core structures laminated with electromagnetic steel plates. The rotary electric machine is characterized in that elastic support pieces elastically contacting the permanent magnets are formed at a part of the insertion grooves of the rotor, and the elastic support pieces have pressing parts for receiving external forces by being elastically deformed at the insertion of the permanent magnets so that clearances may be formed against the permanent magnets. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a magnet-embedded rotating electrical machine in which a permanent magnet is embedded in a rotor, and more particularly to a motor capable of generating a large torque suitable for use in a servomotor. The main target is a drive motor for generating a high output and a large torque to realize a high acceleration operation required for an injection shaft of an injection molding machine or a press ram of a press machine.

  The magnet-embedded rotary electric machine is characterized by its robustness and high efficiency, and has been studied and put into practical use with a spindle shaft drive of a processing machine and a drive motor of an electric vehicle. In this structure, a permanent magnet is inserted into a space for inserting a magnet provided in a rotor core made by laminating electromagnetic steel sheets of a predetermined design shape, and a resin or adhesive is filled in the gap and fixed. It is.

  However, this structure takes a long time to manufacture and has disadvantages such as variations in quality due to the filling condition of the adhesive. As an improvement measure, there is a method in which after the magnets are inserted, the abutment plates are arranged from the top and bottom, and these are fastened by caulking, but additional parts are required and lack of convenience.

  In Japanese Patent Application Laid-Open No. 2000-341920, which is Patent Document 1, a fixing spring is press-fitted into the gap of the magnet insertion hole of the rotor, thereby pressing the permanent magnet in one direction to eliminate the variation in position and during operation. The backlash of the magnet was prevented. Japanese Patent Application Laid-Open No. 2004-289904 of Patent Document 2 describes a structure in which an elastic support mechanism is formed in advance around the magnet insertion groove of the rotor and is directly held without separately providing an elastic member. Yes.

JP 2000-341920 A JP 2004-289904 A

  However, the technique disclosed in Patent Document 1 requires a separate part of the fixing spring, which is expensive and requires additional work. Further, in the configuration shown in Patent Document 2, the permanent magnet is press-fitted into the insertion groove in which the elastic force always works by the elastic support mechanism, thereby supporting the permanent magnet by applying the elastic force. There is a problem that the surface of the permanent magnet and the insertion groove is scratched or the paint is peeled off by sliding between metals. That is, if the permanent magnet or the electromagnetic steel sheet has scratches or peeling of the paint, the magnetic quality becomes non-uniform and rusting may occur. In addition, when a plurality of magnets are press-fitted into the insertion groove, there is a problem that insertion is troublesome.

  An object of the present invention is to provide a magnet-embedded rotating electrical machine that eliminates the above-described conventional problems and inserts a permanent magnet without damaging it, which is simple, low-cost, and has stable magnetic characteristics. .

In order to solve the above problems, the present invention includes a stator formed of a plurality of winding structures and a rotor assembled by inserting permanent magnets into insertion grooves of a core structure in which electromagnetic steel sheets are laminated. In a magnet-embedded rotary electric machine having
An elastic support piece that elastically contacts the permanent magnet is formed in a part of the insertion groove of the rotor, and the elastic support piece is elastically deformed when the permanent magnet is inserted so that a gap is formed between the elastic support piece and the permanent magnet. It has the press part which receives external force, It is characterized by the above-mentioned.

  The pressing portion is provided on a non-contact surface of the elastic support piece with the permanent magnet. Moreover, the said press part may be comprised from the convex part provided in the said elastic support piece, and the said press part may be comprised from the recessed part provided in the said elastic support piece.

  According to the present invention, the magnet inserted into the core of the rotor can be easily and reliably fixed, and the characteristics can be stabilized at a low cost.

Sectional drawing which shows the structure of the rotary electric machine of this invention Example 1. FIG. The detail drawing of the insertion part of the permanent magnet of FIG. 1 similarly. Explanatory drawing which similarly shows the state at the time of insertion of a permanent magnet. Explanatory drawing which similarly shows the state after insertion of a permanent magnet. Explanatory drawing of the insertion part of the permanent magnet of this invention Example 2. FIG. Explanatory drawing of the insertion part of the permanent magnet of this invention Example 3. FIG. Explanatory drawing of the insertion part of the permanent magnet of this invention Example 4. FIG.

  Embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 includes a plurality of teeth 3 that are radially projected from the stator back 2 toward the inside in the radial direction, and a slot 5 in which a coil 4 that winds the teeth 3 is inserted. A stator 6 made of an electromagnetic steel plate is a rotor made of an electromagnetic steel plate in which a plurality of rectangular permanent magnets 8 are embedded along the outer peripheral portion so as to face the teeth portion 3.

  FIG. 2 is a detailed view of two insertion portions of the permanent magnet into the rotor 6, 7 is an insertion groove for the permanent magnet 8 provided along the outer periphery, and 9 is a part of the left and right side surfaces of the insertion groove 7. It is the elastic support piece formed by making it cut. The elastic support piece 9 has a plate thickness due to the curved portion 9b cut into a curved shape, a contact portion 9d with the permanent magnet 8 on the back surface of the curved surface 9b, a pressing portion 9a that receives external force, and a curved cut. The thin deformation portion 9c is used.

  The position of the pressing portion 9a is set so that when an external force in the direction of arrow A is applied, the action line (shown by a broken line) intersects the cavity formed by the curved portion 9b. Accordingly, when the pressing portion 9a receives an external force in the direction of arrow A, the deformation portion 9c deforms in the direction of arrow B.

  In the above configuration, the operation of inserting the permanent magnet into the insertion groove will be described. At the time of insertion, first, a wedge-shaped jig (not shown) made of synthetic resin is inserted into both side ends of the insertion groove 7 shown in FIG. 3, and the pressing portion 3a is pushed in the direction of arrow A. The elastic support pieces 9 on both sides are elastically deformed left and right so that both sides of the insertion groove 7 are spread, and the contact surface 9d moves in the direction of arrow B. When the permanent magnet 8 is inserted in this state, a gap 10 is generated between the contact surface 9 d of the elastic support piece 9 and the permanent magnet 8 as shown in FIGS. 2 and 3. Therefore, the magnet 8 is inserted into the insertion groove expanded by the gap 10 and is smoothly inserted without being scratched against the inner wall of the insertion groove 7. As described above, the elastic support piece 9 has the pressing portion 9 a that receives an external force so as to be elastically deformed when the permanent magnet 8 is inserted and to form a gap 10 between the permanent magnet 8.

  Next, when the magnet 8 is inserted to the bottom of the insertion groove 7, the wedge-shaped jig is removed from the insertion groove 7. Then, the external force to the pressing portion 9a is lost, and the elastic support piece 9 returns to the direction of the arrow c as shown in FIG. 4 due to elasticity, and the contact surface 9d comes into contact with both end surfaces of the permanent magnet 8 so that the gap 10 is eliminated. Thus, the permanent magnet 8 is supported in the insertion groove. The contact surface 9d always supports the permanent magnet 8 firmly in the groove from both sides by the elastic force, and no play occurs even when the rotor is suddenly accelerated or decelerated due to the large torque.

  In this manner, the permanent magnet can be fixed in the insertion groove 7 by a simple method, and the magnet and the insertion groove are not scratched during insertion, so that there is no variation in magnetic characteristics and uniform quality can be maintained. it can. In addition to the wedge, a synthetic resin thin plate may be inserted into the insertion groove 7 and pressed in the arrow A direction. Further, since the wedge is made of synthetic resin, it will not be damaged even if it comes into contact with the electromagnetic steel sheet constituting the rotor.

  The pressing portion 9a of the elastic support piece 9 is provided on a non-contact surface other than the contact surface with the permanent magnet, so that the jig does not interfere with magnet insertion when the jig is inserted. Further, although a flat surface is used as the pressing portion 9a, other shapes may be used.

  FIG. 5 is an explanatory diagram of the insertion portion of the permanent magnet according to the second embodiment, and the pressing portion is composed of a circular protruding portion 9e. In this configuration, the point of action of the external force can be limited by setting the top of the projecting portion 9e to a position that is configured by a curved portion and intersects the cavity. By inserting the wedge 11 having a rectangular cross section into the insertion groove 7, the top of the protruding portion 9 e is pressed in the A direction, and the elastic support piece 9 can be reliably deformed. According to this embodiment, since the protruding portion 9e is circular, it is easy to mold.

  FIG. 6 is an explanatory diagram of a permanent magnet insertion portion according to the third embodiment, and the pressing portion includes a convex portion 9f. In this configuration, the point of action of the external force can be limited by setting the protruding portion 9f to a position that is configured by a curved portion and intersects the cavity. As in FIG. 5, by inserting the wedge 11 having a rectangular cross section into the insertion groove 7, the top of the convex portion 9 f is pressed in the A direction, and the elastic support piece 9 can be reliably deformed.

  FIG. 7 is an explanatory diagram of a permanent magnet insertion portion of the fourth embodiment, and the pressing portion is constituted by a concave portion 9g. In this configuration, the point of action of the external force can be limited by setting the concave portion 9g to a position that is configured by a curved portion and intersects the cavity. When the wedge 11 having a rectangular cross section is inserted into the insertion groove 7, a projection that fits into the recess 9 g is formed, the recess 9 g is pressed in the A direction, and the elastic support piece 9 can be reliably deformed. This embodiment has a feature that when the pressing portion is pressed by the wedge 11, it does not slip.

  The curved portion 9b has an effect of facilitating the magnet insertion work by realizing an accurate deformation dimension. However, if the gap is merely generated in principle without considering the ease of the work, the elastic support piece 9b. The same operation and effect can be realized by providing the pressing portion 9f in a portion far from the magnet of the elastic support piece 9 without providing the bending portion 9b.

  In each of the above-described embodiments, the elastic support piece 9 is elastically deformed when the permanent magnet 8 is inserted and presses (9a, 9e, 9f, 9g) that receive an external force so as to generate a gap 10 between the elastic magnet 9 and the permanent magnet 8. Therefore, the manufacturing process of the rotor 6 can be shortened, there is no variation in quality due to the filling condition of the adhesive, and scratches and paint peeling can be prevented on the permanent magnet and the magnetic steel sheet of the insertion groove, Magnetic quality does not become uneven and there is no risk of rusting. Therefore, there is no quality variation, and it is possible to improve the injection performance and control performance of the injection molding machine, and improve the press performance and quality of the press machine.

  DESCRIPTION OF SYMBOLS 1 ... Stator, 6 ... Rotor, 7 ... Insertion groove, 8 ... Permanent magnet, 9 ... Elastic support piece, 9a, 9e, 9f, 9g ... Press part, 9e ... Circular protrusion part, 9f ... Projection part, 9g ... concave portion, 9b ... curved portion, 9c ... deformed portion, 9d ... contact surface, 10 ... gap.

Claims (4)

In a magnet-embedded rotating electrical machine having a stator formed of a plurality of winding structures and a rotor assembled by inserting permanent magnets into insertion grooves of a core structure in which electromagnetic steel sheets are laminated,
An elastic support piece that elastically contacts the permanent magnet is formed in a part of the insertion groove of the rotor, and the elastic support piece is elastically deformed when the permanent magnet is inserted so that a gap is formed between the elastic support piece and the permanent magnet. A magnet-embedded rotary electric machine having a pressing portion that receives an external force.   2. The magnet-embedded rotating electrical machine according to claim 1, wherein the pressing portion is provided on a non-contact surface of the elastic support piece with the permanent magnet.   3. The magnet-embedded rotating electrical machine according to claim 2, wherein the pressing portion is constituted by a convex portion provided on the elastic support piece.   3. The magnet-embedded rotating electrical machine according to claim 2, wherein the pressing portion is constituted by a recess provided in the elastic support piece.

Images