JP2009240057A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric motor which can improve the torque density. <P>SOLUTION: An inner circumferential side rotor 6 having an inner circumferential side permanent magnet 9B, and an outer circumferential side rotor 5 having an outer circumferential side permanent magnet 9A are arranged coaxially, and the relative phase is suitably changed by a phase-change means. A stator 2 is arranged on the outer circumferential side of the outer circumferential side rotor 5. On the opposite sides of the outer circumferential side permanent magnet 9A in the axial direction, sub-permanent magnets 36, having the same magnetic pole as that on the outer side surface of the outer circumferential side permanent magnet 9A in the radial direction, are arranged facing each other, at positions that are radial outside the outer circumferential side permanent magnet 9A. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric motor having a permanent magnet in a rotor, and more particularly to an electric motor capable of changing the field characteristics of a permanent magnet of a rotor.

  As an electric motor, an inner rotor and an outer rotor each having a permanent magnet are arranged coaxially, and both rotors are rotated relative to each other in the circumferential direction by an actuator (relative to both rotors). It is known that the field characteristics of the entire rotor can be changed by changing the phase (for example, see Patent Document 1).

In this electric motor, the permanent magnets of the outer and inner rotors are opposed to each other with different polarities (with the same polarity arrangement), thereby strengthening the field of the entire rotor and increasing the induced voltage constant. On the contrary, the permanent magnets of the outer peripheral rotor and the inner peripheral rotor are opposed to each other with the same polarity (with a counter electrode arrangement), thereby weakening the field of the entire rotor and reducing the induced voltage constant.
JP 2004-72978 A

  However, in the above-described conventional electric motor, the stator core is disposed in the radially outer region of the permanent magnet of the outer peripheral side rotor, and the magnetic flux enters and exits between the permanent magnet and the stator yoke in the radial direction of the outer peripheral side rotor. Although it is performed through the outer air gap, the magnetic flux generated from the permanent magnet does not necessarily go to the radially outer side (stator yoke), and a part of the magnetic flux is separated from the ends on both axial sides of the outer rotor. Run away in the direction. And if the escape amount of the magnetic flux increases, there is a concern that the torque density of the electric motor decreases and the motor efficiency decreases.

  Accordingly, the present invention is intended to provide an electric motor capable of improving the torque density.

The invention according to claim 1, which solves the above problem, is an inner peripheral rotation in which an inner peripheral permanent magnet (for example, an inner peripheral permanent magnet 9B in an embodiment described later) is disposed along the circumferential direction. A rotor (for example, an inner circumferential rotor 6 in an embodiment described later) and an outer circumferential side along the circumferential direction are disposed coaxially and relatively rotatably on the outer circumferential side of the inner circumferential rotor. An outer rotor (for example, an outer rotor 5 in an embodiment described later) on which a permanent magnet (for example, an outer permanent magnet 9A in an embodiment described later) is disposed, and the inner rotor and outer periphery A phase changing means (for example, a rotating operation mechanism 11 in an embodiment described later) that rotates the rotor relative to each other to change the relative phase between them, and is arranged in a non-contact state on the outer peripheral side of the outer peripheral rotor. Electromagnetic windings (for example, in the embodiments described later). In an electric motor including a stator (for example, a stator 2 in an embodiment described later) having an electromagnetic winding 2a), it is radially outer than the outer peripheral permanent magnet on both axial sides of the outer peripheral permanent magnet. A secondary permanent magnet (for example, a secondary permanent magnet 36 in an embodiment described later) facing each other with the same magnetic pole as the magnetic pole on the radially outer side surface of the outer peripheral permanent magnet is disposed at a position.
The magnetic flux generated from the outer peripheral side permanent magnet is prevented from escaping to both sides in the axial direction by the secondary permanent magnets arranged on both sides in the axial direction, and is directed toward the stator. Further, the secondary permanent magnet and the outer peripheral side permanent magnet form a Halbach arrangement.

According to a second aspect of the present invention, in the electric motor according to the first aspect, the secondary permanent magnet is formed from both axial ends of a stator yoke of the stator (for example, a stator yoke 2b in an embodiment described later). Is also arranged outside.
As a result, the sub permanent magnet is arranged while making the most of the axial width of the stator yoke facing the outer rotor.

  According to a third aspect of the present invention, in the electric motor according to the first or second aspect, the phase changing means is an annular housing (for example, an annular housing in an embodiment described later) provided integrally with the inner circumferential rotor. 15), an inner movable member (for example, a vane rotor 14 in an embodiment to be described later) disposed so as to be relatively rotatable on the radially inner side of the annular housing, the inner circumferential side rotor, and side end portions of the annular housing. A pair of end plates (for example, a drive plate 16 in an embodiment to be described later) for connecting the outer peripheral rotor and the axially opposite ends of the inner movable member across the straddle, and between the annular housing and the inner movable member A liquid chamber (for example, an advance side working chamber 24 and a retard side working chamber 25 in an embodiment described later), and supply and discharge hydraulic fluid to and from the liquid chamber. A structure for relatively rotating the inner periphery side rotor and the child, the auxiliary permanent magnet is characterized in that disposed in the end plate of the opposite sides.

According to a fourth aspect of the present invention, in the electric motor according to the third aspect, the end plate is made of a non-magnetic material, and abuts the outer peripheral side permanent magnet in contact with an axial end of the outer peripheral side permanent magnet. It is characterized by positioning.
As a result, the end plates on both sides hold the secondary permanent magnet and position the outer peripheral permanent magnet. Since the end plate is made of a non-magnetic material, the magnetic flux of the permanent magnet and the sub permanent magnet is difficult to leak through the end plate.

According to a fifth aspect of the present invention, in the electric motor according to any one of the first to fourth aspects, at least one of the outer peripheral side permanent magnet and the inner peripheral side permanent magnet is the same size and the same as the sub permanent magnet. It is characterized in that a plurality of standard permanent magnets are arranged.
Permanent magnets of the same size and standard can be used as secondary permanent magnets, outer peripheral side permanent magnets and inner peripheral side permanent magnets. Further, in the outer peripheral side permanent magnet and the inner peripheral side permanent magnet configured by arranging a plurality of permanent magnets, it is difficult for eddy currents to flow at the minute gaps or joints between the magnets.

  According to the first aspect of the present invention, the auxiliary permanent magnets are arranged on both sides in the axial direction of the outer peripheral side permanent magnet so as to form a Halbach arrangement with the outer peripheral side permanent magnet. While suppressing escape, a large field strength can be obtained by the magnetic lens effect. Therefore, according to the present invention, the torque density can be improved.

  According to the second aspect of the present invention, the auxiliary permanent magnet can be disposed while maximally utilizing the axial width of the stator yoke facing the outer rotor, so that the torque density can be increased more advantageously. it can.

  According to the third aspect of the present invention, since the auxiliary permanent magnets are arranged on the pair of end plates that connect the end portions on both sides in the axial direction of the outer peripheral rotor and the inner movable member, the increase in the number of parts and the increase in the size are increased. The secondary permanent magnet can be arranged at the optimum position without incurring.

  According to the fourth aspect of the present invention, the permanent magnet can be positioned and the secondary permanent magnet can be held without causing leakage of magnetic flux by the end plate made of non-magnetic material.

  According to the invention described in claim 5, since the permanent magnet of the same size and the same standard can be used as the sub permanent magnet, the outer peripheral side permanent magnet, and the inner peripheral side permanent magnet, the product cost can be reduced. In the present invention, since the outer peripheral side permanent magnet and the inner peripheral side permanent magnet are configured by arranging a plurality of permanent magnets, it is difficult for the eddy current to flow due to minute gaps or joints between the magnets. An increase in loss can be suppressed.

Embodiments of the present invention will be described below with reference to the drawings. In each embodiment described below, the same portions are denoted by the same reference numerals, and a part of overlapping description is omitted.
First, a first embodiment of the present invention shown in FIGS. 1 to 5 will be described.
The electric motor 1 shown in FIGS. 1 to 5 is used as a driving source for a hybrid vehicle or an electric vehicle. The electric motor 1 is an inner rotor type brushless motor in which a rotor unit 3 is disposed on the inner peripheral side of an annular stator 2. The stator 2 has a plurality of phases of electromagnetic windings 2a, and the rotor unit 3 has a rotating shaft 4 at the shaft core. Further, the rotational force of the electric motor 1 is transmitted to a wheel drive shaft (not shown) via a transmission (not shown). In this case, if the electric motor 1 functions as a generator when the vehicle is decelerated, it can be recovered as regenerative energy in the electric storage device. Further, in the hybrid vehicle, the rotating shaft 4 of the electric motor 1 can be further connected to a crankshaft (not shown) of the internal combustion engine so that it can be used for power generation by the internal combustion engine.

  The rotor unit 3 includes an annular outer circumferential rotor 5 and an annular inner circumferential rotor 6 disposed coaxially inside the outer circumferential rotor 5, and includes the outer circumferential rotor 5 and the inner circumferential surface. The side rotor 6 is rotatable within a set angle range.

The outer circumferential side rotor 5 and the inner circumferential side rotor 6 are formed by annularly forming rotor main bodies 7 and 8 by laminating a plurality of silicon steel plates in the axial direction. Magnet mounting slots 7a ..., 8a ... are formed along the circumferential direction. Each of the magnet mounting slots 7a and 8a is mounted with a flat plate-like outer peripheral side permanent magnet 9A and inner peripheral side permanent magnet 9B magnetized in the thickness direction. The magnet mounting slots 7a and 8a form a set of two circumferentially adjacent ones on the outer peripheral rotor 5 and the inner peripheral rotor 6, and each set of magnet mounting slots 7a and 8a. Corresponding outer peripheral side permanent magnets 9A and inner peripheral side permanent magnets 9B are mounted so that the same magnetic poles face in the same direction. Moreover, the direction of the magnetic poles of the outer peripheral side permanent magnets 9 </ b> A mounted in the adjacent sets of magnet mounting slots 7 a on the outer peripheral side rotor 5 are opposite to each other, and the adjacent sets of magnets on the inner peripheral side rotor 6. The directions of the magnetic poles of the inner peripheral side permanent magnets 9B mounted in the mounting slot 8a are also opposite to each other. In other words, in the outer rotor 5, pairs of outer permanent magnets 9 </ b> A having an N pole on the outer periphery and pairs of outer permanent magnets 9 </ b> A having an S pole are alternately arranged in the circumferential direction. In the inner circumferential side rotor 6, pairs of inner circumferential side permanent magnets 9B having N poles on the outer circumferential side and pairs of inner circumferential side permanent magnets 9B having S poles are alternately arranged.
A magnetic flux barrier hole 31 for controlling the flow of magnetic flux is formed between the pair of adjacent magnet mounting slots 7 a of the outer rotor 5, and the adjacent magnet mounting slot 8 of the inner rotor 6. A notch 10 for controlling the flow of magnetic flux is formed between the pair.

  The same number of magnet mounting slots 7a and 8a are provided for the outer rotor 5 and the inner rotor 6, and the permanent magnets 9A and 9B of the rotors 5 and 6 correspond to each other on a one-to-one basis. . Accordingly, the permanent magnets 9A and 9B in the magnet mounting slots 7a and 8a of the outer peripheral rotor 5 and the inner peripheral rotor 6 are opposed to each other with the same polarity (disposed in different polarities), thereby providing a rotor unit. 3 is able to obtain a field weakening state in which the entire field is weakened most, and the permanent magnets 9A and 9B in the magnet mounting slots 7a and 8a of the outer rotor 5 and the inner rotor 6 are mutually connected. By making the different poles face each other (with the same polarity arrangement), it is possible to obtain a strong field state in which the field of the entire rotor unit 3 is most enhanced.

  In the rotor unit 3, the outer peripheral side rotor 5 and the inner peripheral side rotor 6 are relatively rotated by a rotation operation mechanism 11. The rotation operation mechanism 11 is operated by the hydraulic pressure of a hydraulic control device (not shown). In this embodiment, the rotation operation mechanism 11 and the hydraulic control device constitute phase changing means for changing the relative phases of the inner circumferential rotor and the outer circumferential rotor.

  The rotation operation mechanism 11 includes a vane rotor 14 (inner movable member) that is spline-fitted to the outer periphery of the rotation shaft 4 and an annular housing 15 that is rotatably disposed on the outer periphery side of the vane rotor 14. The annular housing 15 is integrally fitted and fixed to the inner peripheral surface of the inner circumferential rotor 6, and the vane rotor 14 has side end portions on both sides in the axial direction of the annular housing 15 and the inner circumferential rotor 6. It is integrally coupled to the outer peripheral rotor 5 via a pair of disk-shaped drive plates 16 and 16 (end plates) straddling. Therefore, the vane rotor 14 is integrated with the rotary shaft 4 and the outer peripheral rotor 5, and the annular housing 15 is integrated with the inner peripheral rotor 6.

  In the vane rotor 14, a plurality of vanes 18 projecting radially outward are provided at equal intervals in the circumferential direction on the outer periphery of a cylindrical boss portion 17 that is spline-fitted to the rotary shaft 4. On the other hand, the annular housing 15 is provided with a plurality of concave portions 19 on the inner peripheral surface at equal intervals in the circumferential direction, and the corresponding vanes 18 of the vane rotor 14 are accommodated in the concave portions 19. Each recess 19 is constituted by a bottom wall 20 having an arc surface that substantially matches the rotational trajectory of the tip of the vane 18 and a substantially triangular partition wall 21 that separates the adjacent recesses 19, 19. The vane 18 can be displaced between the one partition wall 21 and the other partition wall 21 during relative rotation of the annular housing 15. In the case of this embodiment, the partition wall 21 also functions as a stopper that restricts the relative rotation of the vane rotor 14 and the annular housing 15 by contacting the vane 18. A seal member 22 is provided along the axial direction at the tip of each vane 18 and the tip of the partition wall 21, and the vane 18, the bottom wall 20 of the recess 19, and the partition wall 21 are provided by these seal members 22. And the outer peripheral surface of the boss portion 17 are liquid-tightly sealed.

  Further, the base portion 15a of the annular housing 15 fixed to the inner peripheral rotor 6 is formed in a cylindrical shape having a constant thickness, and is also provided with respect to the inner peripheral rotor 6 and the partition wall 21 as shown in FIG. Projects outward in the axial direction. Each end projecting outward of the base portion 15a is slidably held in an annular guide groove 16a formed in the drive plate 16, and the annular housing 15 and the inner peripheral rotor 6 are connected to the outer peripheral rotor. 5 and the rotating shaft 4 are supported in a floating state.

  The drive plates 16 and 16 on both sides connecting the outer rotor 5 and the vane rotor 14 are slidably in close contact with both side surfaces (both end surfaces in the axial direction) of the annular housing 15, and the side of each recess 19 of the annular housing 15. Respectively. Therefore, each recessed part 19 forms the independent space part by the boss | hub part 17 of the vane rotor 14, and the drive plates 16 and 16 on both sides, and this space part is an introduction space into which oil is introduced. Each introduction space is divided into two chambers by the corresponding vanes 18 of the vane rotor 14. One chamber is an advance working chamber 24 (liquid chamber) and the other chamber is a retard working chamber 25 (liquid chamber). Room). The advance side working chamber 24 rotates the inner circumferential side rotor 6 relative to the outer circumferential side rotor 5 in the advance direction by the pressure of the oil introduced therein. The inner rotor 6 is rotated relative to the outer rotor 5 in the retarding direction by the pressure of the oil introduced into the outer periphery. In this case, “advance angle” refers to advancing the inner rotor 6 in the rotation direction of the electric motor 1 indicated by the arrow R in FIG. Means that the inner rotor 6 is advanced with respect to the outer rotor 5 in the direction opposite to the rotation direction R of the electric motor 1.

  In addition, oil is supplied to and discharged from each of the advance side working chambers 24 and the retard side working chambers 25 through the rotary shaft 4. Specifically, the advance side working chamber 24 is connected to the advance side supply / discharge passage 26 of the hydraulic control device, and the retard side operation chamber 25 is connected to the retard side supply / discharge passage 27 of the hydraulic control device. However, as shown in FIG. 1, a part of the advance side supply / discharge passage 26 and the retard side supply / discharge passage 27 are formed by passage holes 26a, 27a formed along the axial direction of the rotary shaft 4, respectively. It is configured. The end portions of the passage holes 26a and 27a are connected to annular grooves 26b and 27b formed at positions offset in the axial direction of the outer peripheral surface of the rotating shaft 4, and the annular grooves 26b and 27b are connected to the vane rotor 14. Are connected to a plurality of conduction holes 26c,..., 27c. Each conduction hole 26c of the advance side supply / discharge passage 26 connects the annular groove 26b and each advance side working chamber 24, and each conduction hole 27c of the retard side supply / exhaust passage 27 connects to the annular groove 27b and each retard side. The working chamber 25 is connected.

Here, in the case of the electric motor 1 of this embodiment, when the inner circumferential rotor 6 is at the most retarded position with respect to the outer circumferential rotor 5, the outer circumferential rotor 5 and the inner circumferential rotor 6 are permanent. When the magnets 9 are opposed to each other with different polarities and are in a strong field state, and the inner circumferential rotor 6 is in the most advanced position with respect to the outer circumferential rotor 5, the outer circumferential rotor 5 and the inner circumferential The permanent magnets 9 of the side rotor 6 are set so as to face each other with the same poles and to be in a field weakening state.
The electric motor 1 can arbitrarily change the state of the strong field and the state of the weak field by controlling the supply and discharge of hydraulic oil to and from the advance side working chamber 24 and the retard side working chamber 25. Thus, when the strength of the magnetic field is changed, the induced voltage constant is changed accordingly, and as a result, the characteristics of the electric motor 1 are changed. That is, when the induced voltage constant increases due to the strong field, the allowable rotational speed at which the motor 1 can be operated decreases, but the maximum torque that can be output increases. Conversely, when the induced voltage constant decreases due to the weak field, Although the maximum torque that can be output from the electric motor 1 decreases, the allowable rotational speed at which the motor 1 can operate increases.

  By the way, the drive plates 16 and 16 on both sides connecting the vane rotor 14 and the outer rotor 5 are formed of aluminum which is a non-magnetic material, and are rotated on the outer periphery in a state where they are bolted to the side of the outer rotor 5. The outer peripheral side permanent magnet 9A accommodated in each magnet mounting slot 7a of the child 5 is in contact with the axial end portion. Each outer peripheral permanent magnet 9 </ b> A is positioned in the axial direction by a drive plate 16.

On the outer peripheral edge of each drive plate 16 facing the outer rotor 5, the same number of magnet mounting grooves 35 as the pairs of outer permanent magnets 9 </ b> A on the outer rotor 5 are formed. The secondary permanent magnet 36 is fixedly fitted to the base. The magnet mounting groove 35 is provided on the axial side of the pair of outer peripheral permanent magnets 9A on the outer rotor 5 and at a position slightly offset radially outward from the pair of outer permanent magnets 9A. ing. The auxiliary permanent magnets 36 and 36 disposed on both sides in the axial direction with the pair of outer peripheral side permanent magnets 9A interposed therebetween are opposed to each other by the same magnetic pole as the magnetic pole on the radially outer surface of the pair of outer peripheral side permanent magnets 9A. It is supposed to be. That is, when the magnetic poles on the radially outer side surfaces of any pair of outer peripheral permanent magnets 9A are N poles, the secondary permanent magnets 36, 36 on both sides thereof face each other, and the pair of outer peripheral permanent magnets 9A faces. When the magnetic poles on the outer surface in the radial direction are S poles, the sub permanent magnets 36 on both sides face each other. Accordingly, each outer permanent magnet 9A on the outer rotor 5 and the auxiliary permanent magnets 36, 36 on both sides in the axial direction form a Halbach arrangement, and the field of each outer permanent magnet 9A is a magnetic lens by this Halbach arrangement. It will be strengthened by the effect.
Further, the axial width of the outer rotor 5 is formed to be the same as the axial width of the stator yoke 2b around which the electromagnetic winding 2a is wound, and is mounted on the drive plates 16 and 16 on both sides. The sub-permanent magnet 36 is disposed in a radially inner region outside the stator yoke 2b in the axial direction (an inner region of the electromagnetic winding 2a protruding from the axial end of the stator yoke 2b).

  In the above configuration, when the field characteristics of the electric motor 1 are changed, the hydraulic fluid is supplied to one of the advance side working chamber 24 and the retard side working chamber 25 by supplying and discharging the hydraulic fluid by the hydraulic pressure control device. At the same time, the hydraulic fluid is discharged from the other side. When the supply / discharge of the hydraulic fluid is controlled in this way, the vane rotor 14 and the annular housing 15 are relatively rotated, and accordingly, the relative phases of the outer peripheral rotor 9A and the inner peripheral rotor 9B are operated.

  When the inner circumferential side rotor 4 is operated to the retard side with respect to the outer circumferential side rotor 5, the outer circumferential side permanent magnet 9A and the inner circumferential side permanent magnet 9B are opposed to each other with different magnetic poles so At this time, as shown in FIG. 4, the secondary permanent magnet 36 guides the magnetic flux generated from the outer peripheral side permanent magnet 5 in the direction of the stator yoke 2b, and further strengthens the field by the magnetic lens effect. . On the other hand, when the inner rotor 4 is operated toward the advance side with respect to the outer rotor 5, the outer permanent magnet 9A and the inner permanent magnet 9B face each other and weaken. At this time, as shown in FIG. 5, the secondary permanent magnet 36 induces the magnetic flux generated from the outer peripheral side permanent magnet 5 in the direction of the stator rotor 2b and further weakens the field. Function.

  In the electric motor 1, the outer side permanent magnet 9 </ b> A is opposite to the outer side permanent magnet 9 </ b> A in the radial direction outside the outer side permanent magnet 9 </ b> A so as to face each other with the same magnetic pole as the magnetic pole on the outer side surface of the outer side permanent magnet 9 </ b> A. Since the secondary permanent magnet is disposed 36, the magnetic flux generated from the outer peripheral side permanent magnet 9A can be prevented from escaping outward in the axial direction by the magnetic action of the secondary permanent magnet 36. A large field effect can be obtained by the magnetic lens effect by the Halbach arrangement of the permanent magnets 36. Therefore, since the electric motor 1 can cause the magnetic flux generated from the outer peripheral side permanent magnet 9A to act on the stator 2 without loss, the torque density can be improved.

  Further, in this electric motor 1, the secondary permanent magnet 36 is attached to the drive plate 16, and is disposed in the radially inner region outside the axial end of the stator yoke 2b. The magnetic flux can be prevented from escaping from the axial direction without pressing the axial width of the stator yoke 2b where the magnetic flux enters and exits. Therefore, the torque density can be further increased.

  Furthermore, in the case of the electric motor 1, the auxiliary permanent magnet 36 is attached to the outer peripheral edge of the drive plate 16 that connects the vane rotor 14 and the outer rotor 5, so that a dedicated attachment member or the like is not necessary, and the number of parts is increased. An increase in the size of the entire apparatus can be avoided.

  In addition, in this electric motor 1, since the drive plate 16 that holds the secondary permanent magnet 36 is formed of aluminum that is a non-magnetic material, the secondary permanent magnet 36 that passes through the drive plate 16 and the outer peripheral permanent magnet 9A Magnetic flux leakage can be prevented. In the case of the electric motor 1 of this embodiment, the axial end face of the outer peripheral side permanent magnet 9A is abutted against the drive plate 16, and the outer peripheral side permanent magnet 9A is positioned in the axial direction by the drive plate 16. Therefore, it is possible to eliminate the dedicated positioning parts for the outer peripheral side permanent magnet 9A and reduce the number of parts.

FIG. 6 shows a second embodiment of the present invention.
The basic configuration of the electric motor 101 of this embodiment is substantially the same as that of the first embodiment, but the configuration of the outer peripheral side permanent magnet 109A and the inner peripheral side permanent magnet 109B is different from that of the first embodiment. Yes.
That is, the outer peripheral side permanent magnet 109A and the inner peripheral side permanent magnet 109B of this embodiment are configured by joining a plurality of permanent magnets p having the same size and the same standard as the sub permanent magnet 36.

  The electric motor 101 of this embodiment can obtain the same effects as those of the first embodiment described above, and the outer peripheral permanent magnet 9A and the inner peripheral permanent magnet 9B have the same size and the same standard as the sub permanent magnet 36. Therefore, the secondary permanent magnet 36, the outer peripheral side permanent magnet 9A, and the inner peripheral side permanent magnet 9B can be covered with only a single type of permanent magnet p. it can. Therefore, the cost of the permanent magnet p can be reduced.

  Further, since the outer peripheral side permanent magnet 9A and the inner peripheral side permanent magnet 9B are joined with a plurality of permanent magnets p and the magnet elements are insulated by an adhesive or a minute gap, the outer peripheral side permanent magnet 9A or The eddy current generated in the inner peripheral side permanent magnet 9B can be reduced. Therefore, this configuration can suppress an increase in iron loss.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary.

Sectional drawing of the electric motor of 1st Embodiment of this invention. The side view of the rotor unit which removed some components which show the embodiment. The disassembled perspective view of the rotor unit of the embodiment. Sectional drawing which expanded the principal part of the electric motor of the embodiment. Sectional drawing which expanded the principal part of the electric motor of the embodiment. Sectional drawing which expanded the principal part of the electric motor of 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric motor 2 ... Stator 2a ... Electromagnetic winding 2b ... Stator yoke 5 ... Outer side rotor 6 ... Inner side rotor 9A, 109A ... Outer side permanent magnet 9B, 109B ... Inner side permanent magnet 11 ... Time Dynamic operation mechanism (phase change means)
14 ... Vane rotor (inner movable member)
15 ... annular housing 16 ... drive plate 24 ... advance side working chamber (liquid chamber)
25 ... retarded-side working chamber (liquid chamber)
36 ... Sub permanent magnet

Claims (5)

An inner rotor on which inner permanent magnets are arranged along the circumferential direction;
An outer peripheral rotor on which an outer peripheral permanent magnet is disposed along the circumferential direction, coaxially and relatively rotatably disposed on the outer peripheral side of the inner peripheral rotor,
Phase changing means for changing the relative phase of the inner and outer rotors by relatively rotating the inner and outer rotors;
A non-contact state disposed on the outer peripheral side of the outer peripheral rotor, and a stator having an electromagnetic winding,
In an electric motor with
Sub-permanent magnets facing each other with the same magnetic poles as the magnetic poles on the radially outer side surface of the outer peripheral side permanent magnet are disposed on both sides in the axial direction of the outer peripheral side permanent magnet at a radially outer position than the outer peripheral side permanent magnet. An electric motor characterized by that.   2. The electric motor according to claim 1, wherein the secondary permanent magnet is disposed outside both axial end portions of the stator yoke of the stator. The phase changing means includes an annular housing provided integrally with the inner circumferential rotor, an inner movable member disposed so as to be rotatable relative to a radial inner side of the annular housing, and the inner circumferential rotor. A pair of end plates that connect end portions on both sides in the axial direction of the outer peripheral rotor and the inner movable member across a side end portion of the annular housing, and a liquid provided between the annular housing and the inner movable member And a configuration for rotating the outer peripheral side rotor and the inner peripheral side rotor relative to each other by supplying and discharging hydraulic fluid to and from the liquid chamber,
The electric motor according to claim 1, wherein the sub permanent magnet is disposed on the end plates on both sides.   4. The electric motor according to claim 3, wherein the end plate is made of a non-magnetic material, and abuts against an axial end portion of the outer peripheral side permanent magnet to position the outer peripheral side permanent magnet.   5. At least one of the outer peripheral side permanent magnet and the inner peripheral side permanent magnet is configured by arranging a plurality of permanent magnets having the same size and the same standard as the sub permanent magnet. The electric motor according to item.

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