JP2012034520A - Rotor and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor capable of improving magnetic balance and hence rotation performance.SOLUTION: A rotor 20 is configured such that a rotor core 22 includes a plurality of magnet fixing parts 22a in a circumferential direction, magnets 23 of one magnetic pole are disposed at the magnet fixing parts 22a, salient poles 22b of the rotor core 22 are disposed between the respective magnets 23 with gaps K, and the salient poles 22b are made to function as the other magnetic pole. The rotor core 22 is formed by disposing a first core member 31 including a first fixing part 31a which is one side in the circumferential direction in the magnet fixing part 22a and a first salient pole part 31b which is the other side in the circumferential direction in the salient pole 22b adjacent to the one side, and a second core member 32 including a second fixing part 32a which is the other side in the circumferential direction in the magnet fixing part 22a and a second salient pole part 32b which is one side in the circumferential direction in the salient pole 22b adjacent to the other side, so as to be in the same planar shape and magnetically separated.

Description

  The present invention relates to a rotor and a motor adopting a continuous pole type structure.

  As a rotor used in a motor, for example, as shown in Patent Document 1, a plurality of magnets of one magnetic pole are arranged in the circumferential direction of the outer peripheral surface of the rotor core, and salient poles integrally formed on the core are each provided. There is known a rotor having a so-called continuous pole type structure in which a gap is provided between magnets and the salient pole functions as the other magnetic pole.

JP 9-327139 A

  By the way, in a rotor having a normal configuration in which all the magnetic poles are composed of magnets, the magnetic flux on the magnet back side (magnet fixing portion) is evenly separated from the circumferential central portion to both sides, and the magnetic balance of the rotor is improved. . On the other hand, in a rotor having a consequent pole type structure as in Patent Document 1, since the salient pole itself does not have a magnetic force forcing (induction), from the occasional positional relationship with the teeth of the opposing stator, A large amount of magnetic flux on the back side of the magnet is guided so as to pass through the salient poles having a small magnetic resistance without separating them in a balanced manner from the circumferential central portion to the salient poles on both sides. In other words, the direction of the magnetic flux and the amount of magnetic flux at the salient pole part become more prominent, so the rotor becomes magnetically unbalanced, which leads to deterioration in rotational performance such as reduction in motor torque and increase in vibration. Yes. Further, in the rotor having a consequent pole type structure as in Patent Document 1, the salient pole ratio tends to be smaller than that of the rotor having the normal configuration.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotor and a motor that can improve the magnetic balance and thus improve the rotational performance. It is in.

  In order to solve the above problems, in the invention according to claim 1, a plurality of magnet fixing portions are provided in the circumferential direction on the outer peripheral surface of the rotor core, and magnets of one magnetic pole are respectively disposed on the magnet fixing portions. The rotor core is configured such that salient poles provided on the rotor core are arranged with gaps between the magnets, and the salient pole functions as the other magnetic pole, and the rotor core is the magnet as viewed in the axial direction. A first fixing portion having a first fixing portion that is one side in the circumferential direction of the fixing portion and a first salient pole portion that is the other side in the circumferential direction of the salient pole adjacent to one side in the circumferential direction of the first fixing portion. A core member, a second fixing portion which is the other circumferential side of the magnet fixing portion when viewed from the axial direction, and a circumferential one of the salient poles adjacent to the other circumferential side of the second fixing portion. A second core member and a second salient pole portions are side is the gist that it is configured so disposed as to magnetically separated in the same plane.

  According to the same configuration, the first core member includes the first fixing portion that is one side in the circumferential direction of the magnet fixing portion and the other in the circumferential direction of the salient pole adjacent to one side in the circumferential direction of the first fixing portion. And a first salient pole portion on the side. The second core member is a second fixing portion that is the other side in the circumferential direction of the magnet fixing portion and a first side that is the one side in the circumferential direction of the salient pole adjacent to the other side in the circumferential direction of the second fixing portion. 2 salient poles. Since the first core member and the second core member are arranged so as to be magnetically separated in the same plane and the rotor core is configured, for example, from the first fixed portion to the second salient pole portion. It is suppressed that the magnetic flux flows or the magnetic flux flows from the second fixed portion to the first salient pole portion, and the bias of the magnetic flux flow can be suppressed. In other words, the magnetic flux can ideally flow from the first fixed portion to the first salient pole portion, and the magnetic flux can ideally flow from the second fixed portion to the second salient pole portion. It can be a typical one. From this, it becomes possible to improve the magnetic balance of the rotor, and thus to improve the rotational characteristics such as torque characteristics and vibration characteristics. Further, the salient pole ratio can be made close to 1 to increase the torque.

  According to a second aspect of the present invention, in the rotor according to the first aspect, the first core member is single by a first central portion provided on one side in the axial direction on the radially inner side of the rotor core. The gist is that the second core member is a single component by a second central portion provided on the other axial side of the rotor core in the radial direction.

According to this configuration, since the first core member and the second core member are each a single component, component management can be facilitated and assemblability can be improved.
The invention according to claim 3 is summarized in that in the rotor according to claim 2, a nonmagnetic material is interposed at the magnetically separated position.

According to this configuration, since the nonmagnetic material is interposed at the magnetic separation position, the rigidity is higher than the configuration in which the magnetic separation is simply performed by the gap.
According to a fourth aspect of the present invention, in the rotor according to the first aspect, the first core member is formed as a single component by a first central portion provided on the radially inner side of the rotor core and is entirely formed. Are formed in the same shape in the axial direction, and the second core member is a plurality of parts each having only one second fixing portion and one second salient pole portion, and the whole is axially formed. The gist is that they are formed in the same shape, and the first core member and the second core member are fixed via a non-magnetic material provided at the magnetic separation position.

  According to this configuration, since the first core member is a single component, component management can be facilitated and assemblability can be improved. In addition, since the first core member and the second core member are formed in the same shape in the axial direction as a whole, the first core member and the second core member are easy to manufacture, and in particular, it is easy to manufacture by stacking core sheets.

According to a fifth aspect of the present invention, in the rotor according to the fourth aspect, the nonmagnetic material is made of a resin material.
According to this configuration, since the non-magnetic body is made of a resin material, the first core member and the second core member can be easily fixed by integral molding, and a rotor core can be easily obtained.

A sixth aspect of the present invention is summarized in that, in the rotor according to the third or fourth aspect, the nonmagnetic material is made of an elastomer.
According to this configuration, since the nonmagnetic material is made of an elastomer, vibration generated in the rotor can be attenuated.

The gist of the seventh aspect of the present invention is that the rotor according to any one of the first to sixth aspects is provided.
According to this configuration, it is possible to provide a motor having the effects of the invention according to any one of claims 1 to 6.

  ADVANTAGE OF THE INVENTION According to this invention, the improvement of a magnetic balance can be aimed at and the rotor and motor which can aim at the improvement of rotation performance by extension can be provided.

The top view of the motor in this Embodiment. The exploded perspective view of the rotor core in this Embodiment. The top view of the rotor in another example. The perspective view of the rotor in another example. The exploded partial sectional view of the rotor core in another example. The top view of the motor in another example.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 shows an inner rotor type brushless motor (hereinafter simply referred to as a motor) M. As shown in FIG. 1, the stator 10 in the motor M includes a stator core 11 having a cylindrical portion 11a and a plurality of teeth (60 in this example) 11b extending inward in the radial direction from the cylindrical portion 11a. . A segment winding 12 as a winding for generating a magnetic field for rotating the rotor 20 is inserted between the teeth 11 b of the stator core 11.

  The segment windings 12 of the stator 10 are multiphase (three phases). The segment winding 12 includes a slot insertion portion 13a disposed in the slot so as to penetrate the slot between the teeth 11b in the axial direction (direction orthogonal to the paper surface), and a slot protrusion (not shown) protruding in the axial direction from the slot. For each phase. The segment conductors 13 for each phase are configured to be electrically connected in the circumferential direction between the slot protrusions. Each segment conductor 13 is formed by bending a conductor plate and is formed in a substantially U shape, and a pair of slot insertion portions 13a corresponding to U-shaped parallel straight portions includes six pieces in the circumferential direction. They are arranged in two slots that are separated from each other across the teeth 11b. That is, the stator 10 has 60 slots and distributed winding.

  In addition, the rotor 20 disposed inside the stator 10 in the motor M has a substantially annular rotor core 22 that is externally fitted to the outer peripheral surface of the rotating shaft 21 as shown in FIG. Five magnet fixing portions 22a are formed in the circumferential direction (at equal angular intervals) on the outer peripheral surface of the rotor core 22, and N-pole magnets 23 are fixed to the magnet fixing portions 22a (five in total). ing. In addition, between the magnets 23, salient poles 22b provided on the outer periphery of the rotor core 22 are arranged with gaps K (having a constant area when viewed in the axial direction in this embodiment) at each boundary with the magnet 23. Has been. That is, the magnets 23 and the salient poles 22b are alternately arranged at equiangular (36 °) intervals, and the rotor 20 is a so-called continuous of 10 poles that causes the salient poles 22b to function as the S poles with respect to the N pole magnets 23. It is composed of pole type.

  Here, as shown in FIGS. 1 and 2, the rotor core 22 of the present embodiment is disposed so that the first core member 31 and the second core member 32 are magnetically separated in the same plane. Has been configured.

  Specifically, the first core member 31 includes a first fixing portion 31a that is one side in the circumferential direction of the magnet fixing portion 22a as viewed from the axial direction (clockwise side in FIG. 1) and the first fixing portion 31a. A first salient pole portion 31b which is the other circumferential side (counterclockwise side in FIG. 1) of the salient pole 22b adjacent to one side in the circumferential direction. As shown in FIGS. 1 and 2, the first core member 31 of the present embodiment has one axial side on the radially inner side of the rotor core 22 (the front side in FIG. In FIG. 2, a single component is formed by an annular first press-fitting portion 31 c as a first central portion provided on the upper side. That is, the first core member 31 of the present embodiment has a shape in which five blocks 31d including the first fixed portion 31a and the first salient pole portion 31b are provided radially from the annular first press-fit portion 31c. Is formed.

  The second core member 32 includes a second fixing portion 32a on the other side (counterclockwise in FIG. 1) in the circumferential direction of the magnet fixing portion 22a when viewed from the axial direction, and the second fixing portion 32a. And the second salient pole part 32b which is one side (clockwise side in FIG. 1) in the circumferential direction of the salient pole 22b adjacent to the other side in the circumferential direction. And the 2nd core member 32 of this Embodiment is the other side of the axial direction in the radial inside of the rotor core 22, as shown in FIG.1 and FIG.2. 2, the lower part) is formed as a single component by an annular second press-fitting portion 32 c as a second central portion. That is, the second core member 32 of the present embodiment has a shape in which five blocks 32d including the second fixing portion 32a and the second salient pole portion 32b are radially provided from the annular second press-fit portion 32c. Is formed. Note that the first core member 31 and the second core member 32 of the present embodiment are formed by sintering magnetic powder.

  The first core member 31 and the second core member 32 are arranged so that the blocks 31d and 32d are alternately arranged with a slight gap S (see FIG. 1) in the circumferential direction, and The first and second press-fit portions 31c and 32c are arranged so as to be overlapped in the axial direction to constitute the rotor core 22. At this time, the first fixing portion 31a and the second fixing portion 32a are arranged in parallel via the gap S to constitute one magnet fixing portion 22a, and the first salient pole portion 31b and the second salient pole. The portions 32b are arranged in parallel via the gap S to constitute one salient pole 22b. Further, the first fixing portion 31a and the second fixing portion 32a of the present embodiment are set to have the same circumferential width, and the gap S is formed at the center in the circumferential direction of the magnet fixing portion 22a. Become. The first salient pole portion 31b and the second salient pole portion 32b of the present embodiment have the same circumferential width, and the gap S is formed at the center of the salient pole 22b in the circumferential direction. become. The magnet 23 having a substantially rectangular parallelepiped shape whose outer side in the radial direction is an arc is fixed to the magnet fixing portion 22a (first and second fixing portions 31a and 32a), and the first and second press-fit portions 31c and 32c. The rotary shaft 21 is press-fitted into.

Next, characteristic effects of the above embodiment will be described below.
(1) The first core member 31 includes a first fixing portion 31a which is one side in the circumferential direction of the magnet fixing portion 22a (clockwise side in FIG. 1) and one side in the circumferential direction of the first fixing portion 31a. 1st salient pole part 31b which is the other side (counterclockwise side in Drawing 1) of the peripheral direction in said salient pole 22b adjacent to. The second core member 32 includes a second fixing portion 32a which is the other side in the circumferential direction of the magnet fixing portion 22a (counterclockwise side in FIG. 1) and the other side in the circumferential direction of the second fixing portion 32a. And the second salient pole portion 32b which is one side in the circumferential direction of the salient pole 22b adjacent to (a clockwise side in FIG. 1). And since the 1st core member 31 and the 2nd core member 32 are arrange | positioned so that it may magnetically isolate | separate on the same plane, the rotor core 22 is comprised, For example, it is 2nd from the 1st fixing | fixed part 31a. This prevents the magnetic flux from flowing through the salient pole portion 32b or the magnetic flux from the second fixed portion 32a to the first salient pole portion 31b, thereby suppressing the bias of the magnetic flux flow. In other words, the magnetic flux can ideally flow from the first fixed portion 31a to the first salient pole portion 31b, and the magnetic flux can ideally flow from the second fixed portion 32a to the second salient pole portion 32b. Can be ideal. As a result, it is possible to improve the magnetic balance of the rotor 20 and thus improve the rotational characteristics such as torque characteristics and vibration characteristics. Further, the salient pole ratio can be made close to 1 to increase the torque.

(2) Since each of the first core member 31 and the second core member 32 is a single component, component management can be facilitated and assemblability can be improved.
The above embodiment may be modified as follows.

  In the above embodiment, the first core member 31 and the second core member 32 are each a single component. However, the present invention is not limited to this, and at least one may be a plurality of components. For example, FIG. And you may change as shown in FIG.

  Specifically, the first core member 41 of this example (see FIGS. 3 and 4) is similar to the first fixed portion 41a and the first salient pole portion 41b (that is, the block 31d of the above embodiment) as in the above embodiment. The same block 41d) and the annular first press-fitting portion 41c as the first central portion constitute a single component and the whole is formed in the same shape in the axial direction.

  Further, the second core member 42 of this example (see FIGS. 3 and 4) has a plurality of parts each having only one second fixing portion 42a and second salient pole portion 42b similar to the above embodiment. (That is, each block is a part similar to the block 32d in the above embodiment) and is formed in the same shape in the axial direction.

  And the 1st core member 41 and the 2nd core member 42 are being fixed via the nonmagnetic body 43 provided in the position isolate | separated magnetically so that it may be magnetically isolate | separated by the same plane shape. . The first core member 41 and the second core member 42 in this example (see FIGS. 3 and 4) are formed by laminating core sheets 41e and 42d (see FIG. 4), respectively. Further, the nonmagnetic material 43 of this example (see FIGS. 3 and 4) is made of a resin material, and the first core member 41 and the second core member 42 are fixed by being integrally formed.

  Even if it does in this way, the effect similar to the effect (1) of the said embodiment can be acquired. Moreover, if it does in this way, since the 1st core member 41 becomes a single component, component management can be made easy or assembly | attachment property can be made favorable. Further, since the first core member 41 and the second core member 42 are formed in the same shape in the axial direction as a whole, the manufacture becomes easy. In particular, the core sheets 41e and 42d are laminated as in this example. And easy to manufacture. Further, since the nonmagnetic material 43 is made of a resin material, the first core member 41 and the second core member 42 can be easily fixed by integral molding, and the rotor core 44 can be easily obtained.

  The first and second core members 31 and 32 of the above-described embodiment (see FIGS. 1 and 2) are formed by sintering magnetic powder, which is another example (see FIGS. 3 and 4). The first and second core members 41 and 42 are formed by laminating the core sheets 41e and 42d, but may be obtained by other configurations or other manufacturing methods, for example, obtained by cutting. It is good also.

  In the above embodiment, although not particularly mentioned, as shown in FIG. 5, the first and second core members 31 and 32 are opposed to the opposing surfaces of the first and second press-fit portions 31c and 32c. Restricting portions (steps) 31e and 32e for restricting rotation may be provided. In this way, the width of the gap S can be maintained with high accuracy.

  The stator 10 of the above embodiment is of distributed winding with 60 slots, but is not limited to this. For example, as shown in FIG. Good. That is, the stator 51 of this example (see FIG. 6) includes a stator core 52 in which 12 teeth 52a extending radially inward are provided in the circumferential direction, and a winding 53 wound around the teeth 52a in concentrated winding. Is provided. Even if it does in this way, the effect similar to the effect of the said embodiment can be acquired. In the above-described embodiment, the number of the magnets 23 (the salient poles 22b) is embodied in the motor M having 5 (that is, 10 magnetic poles), but the number of the magnetic poles may be embodied in another number of motors. Of course, the number of slots may be changed according to the number of magnetic poles.

  In the above embodiment, the first core member 31 and the second core member 32 are magnetically separated in the same plane by the gap S. However, the magnetic separation position (the portion of the gap S) ) May include a non-magnetic material. If it does in this way, rigidity will become high compared with the structure separated only magnetically by the clearance gap S. FIG.

  In addition, the nonmagnetic material of this other example and the nonmagnetic material 43 in the other example (see FIGS. 3 and 4) may be changed to another nonmagnetic material (nonmagnetic material). You may change it to become. If the non-magnetic material is made of an elastomer, vibration generated in the rotor can be attenuated.

  In the above embodiment, the first fixing portion 31a and the second fixing portion 32a are set to have the same circumferential width. However, the present invention is not limited to this, and the circumferential width may be different. . In the above embodiment, the first salient pole portion 31b and the second salient pole portion 32b are set to have the same circumferential width. However, the present invention is not limited to this. May be.

  DESCRIPTION OF SYMBOLS 20 ... Rotor, 22, 44 ... Rotor core, 22a ... Magnet fixing part, 22b ... Salient pole, 23 ... Magnet, 31, 41 ... First core member, 31a, 41a ... First fixing part, 31b, 41b ... First Salient pole part, 31c, 41c ... 1st press-fit part (1st center part), 32, 42 ... 2nd core member, 32a, 42a ... 2nd fixing | fixed part, 32b, 42b ... 2nd salient pole part, 32c ... 2nd press-fit part (2nd center part), 43 ... Nonmagnetic material, K ... Air gap.

Claims (7)

A plurality of magnet fixing portions are provided in the circumferential direction on the outer peripheral surface of the rotor core, and magnets of one magnetic pole are respectively arranged on the magnet fixing portions, and salient poles provided on the rotor core are arranged with gaps between the magnets. A rotor configured to function the salient pole as the other magnetic pole,
The rotor core includes a first fixing portion that is one side in the circumferential direction of the magnet fixing portion when viewed from the axial direction and a second side in the circumferential direction of the salient pole adjacent to one side in the circumferential direction of the first fixing portion. A first core member having a first salient pole part, a second fixing part which is the other side in the circumferential direction of the magnet fixing part when viewed from the axial direction, and a second side in the circumferential direction of the second fixing part A second core member having a second salient pole portion which is one side in the circumferential direction between adjacent salient poles is disposed and configured to be magnetically separated in the same plane. Rotor. The rotor according to claim 1, wherein
The first core member is a single component by a first central portion provided on one side in the axial direction on the radially inner side of the rotor core,
The rotor, wherein the second core member is formed as a single component by a second central portion provided on the other axial side on the radially inner side of the rotor core. The rotor according to claim 2, wherein
A rotor characterized in that a nonmagnetic material is interposed at the magnetically separated position. The rotor according to claim 1, wherein
The first core member is formed as a single part by a first central portion provided radially inward of the rotor core and is formed in the same shape in the axial direction as a whole.
The second core member is a plurality of parts each having only one second fixing portion and one second salient pole portion, and the whole is formed in the same shape in the axial direction.
The rotor, wherein the first core member and the second core member are fixed via a nonmagnetic material provided at the magnetic separation position. The rotor according to claim 4, wherein
The non-magnetic body is made of a resin material. In the rotor according to claim 3 or claim 4,
The rotor, wherein the nonmagnetic material is made of an elastomer.   A motor comprising the rotor according to claim 1.

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