JP2007318860A - Rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating electric machine which can change field magnetic flux according to the magnitude of a load irrespective of the rotational speed of a rotor, without causing unnecessary loss, with a rotor simple in structure. <P>SOLUTION: In the motor provided with the rotor R having field magnets at rotor cores, the rotor R comprises the fixed-side rotor core 1 fixed to a rotating shaft 5, and the turnable-side rotor core 2 attached to the fixed-side rotor core 1 so as to be turnable relatively to the core. The fixed-side rotor core 1 has recesses 1b formed at a face side opposing the turnable-side rotor core 2, and a plurality of pins 6 which are press-fixed to the recesses 1b along the circumferential direction. The turnable-side rotor core 2 has: a step 2a which is formed so as to be engaged with the recesses 1b of the fixed-side rotor core 1; protrusions 2b which are formed so as to be protrusive in a plurality of pieces at the inside-diameter side of the step; a coil spring 8 which is inserted into a guide groove 2c between the plurality of protrusions 2b; and a spring sheet 7 which is inserted into the guide groove 2c between the coil spring 8 and the protrusions 2b, has holes 7a for locking the pins 6, and is energized by the coil spring 8. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine having a rotor in which a field magnet is installed on a rotor core.

In a conventional rotating electric machine having a rotor having an embedded magnet structure, a field magnet is generally fixed to the rotor. Since the induced voltage of such a rotating electrical machine is proportional to the field magnetic flux and the rotational speed of the rotor, the relationship between the induced voltage and the rotational speed has a characteristic as shown by the straight line ab in FIG. Therefore, if an electric motor whose power source voltage is limited by the voltage c is taken as an example, the maximum rotational speed of the electric motor is a narrow operating range limited by the rotational speed d.
Therefore, a rotating electrical machine having a rotor with an embedded magnet structure that changes the field magnetic flux in accordance with the rotational speed of the rotor has been proposed (see, for example, Patent Document 1).
FIG. 13 is an exploded perspective view of a rotating electrical machine having a rotor with an embedded magnet structure showing the first prior art, where (A) shows a low rotation and (B) shows a high rotation.
The rotating electrical machine in FIG. 13 has a stator having a winding for generating a rotating magnetic field in a plurality of stator magnetic poles (not shown), and a field that rotates with respect to the plurality of stator magnetic poles and is fixed to the rotating shaft 100. The phases of the plurality of rotors 101 and 102 having the magnets 103 and 104 and the combined magnetic poles of the plurality of rotors are changed with the rotation of the second rotor 102 with respect to the magnetic poles of the first rotor 101. The mechanism includes a long groove 105 provided in the second rotor 102, a long hole 108 provided in the governor fixing plate 106, and a tip connected by a governor 107 and an elastic member 110 so that they are attracted by their elastic force. The movable side shaft 109 moves along the long hole 108 and the long groove 105. Specifically, the first field magnet 103 installed on the first rotor 101 and the second field magnet 104 installed on the second rotor 102 are shown in FIG. As shown in FIG. 13B, magnetic poles of the same polarity are aligned in the axial direction. When the rotational speed is high, magnetic poles of different polarities are aligned in the axial direction using the mechanism as shown in FIG. It has a structure. According to this technique, when the rotational speed of the rotor is high, the magnetic flux of the field magnet cancels out, so that the induced voltage can be lowered and the high-speed operation region can be expanded accordingly.
On the other hand, a rotating electrical machine that has a rotor with a surface magnet structure and changes the field magnetic flux in accordance with the rotation speed of the rotor is proposed in addition to the rotor with the embedded magnet structure described above (for example, Patent Documents). 2).
FIG. 14 is a front view of a rotating electric machine having a rotor having a surface magnet structure showing the second prior art.
In FIG. 14, a field magnet 123 is fixed to the surface of the rotor core 122 of the movable rotor 121 attached to the rotating shaft 120,
1148446411610_0
As shown, a pair of spiral guide grooves 124 for rotation are provided. The grooves 124 are arranged 180 degrees symmetrically,
1148446411610_1
Then, it turns counterclockwise as it goes outward in the radial direction. A weight 125 is inserted into each groove 124 in the axial direction, and the weight 125 can freely slide or rotate in the groove. With such a configuration, the field magnetic flux is changed according to the rotational speed of the rotor using the weight 120 and the helical spring 126.
JP-A-10-155262 (page 9, FIG. 3) Japanese Patent Laying-Open No. 2004-242461 (page 9, FIG. 3)

However, the prior art has the following problems.
In the rotary electric machine having the rotor of the embedded magnet structure of the first prior art, it is difficult to understand in the exploded perspective view of FIG. 13, but a mechanism for changing the field magnetic flux according to the rotation speed of the rotor is provided inside the rotor core. When assembled by insertion, the mechanism does not completely fit in the axial length of the rotor core, and is configured to protrude from the rotor core, increasing the axial length of the entire rotor. However, it was disadvantageous for downsizing of the rotating electrical machine. Further, since the number of parts constituting the mechanism for changing the field magnetic flux in accordance with the rotational speed of the rotor is large, the structure of the rotating electrical machine has only been complicated.
In the rotating electric machine having the rotor of the surface magnet structure of the second prior art, the magnetic flux by the field magnet is not short-circuited in the rotor core when the rotational speed of the rotor is high. Although it becomes possible to cancel the magnetic flux and widen the high-speed operation range, the reduction of iron loss generated in the stator is insufficient. For this reason, there is a problem that as the rotational speed of the rotor increases, the efficiency decreases due to an increase in iron loss, and the rotating electrical machine becomes hot and the rated output decreases.
In the first and second prior arts, a large field magnetic flux is obtained regardless of the magnitude of the load at the time of low rotation. For this reason, there is a problem in that the starting torque of the rotor increases or the positioning accuracy deteriorates with loss torque even in a state close to no load. In addition, there is a problem that labor is required for ensuring the durability of the governor mechanism, suppressing abnormal vibration, and reducing costs.
The present invention has been made in view of such problems, and can change the field magnetic flux in accordance with the magnitude of the load regardless of the rotational speed of the rotor and is accompanied by unnecessary loss. It is an object of the present invention to provide a rotating electrical machine having a small and simple rotor with no structure.

In order to solve the above problems, the present invention is configured as follows.
The invention according to claim 1 is a rotating electrical machine having a stator formed by winding a stator winding around a stator core, and a rotor having a field magnet in the rotor core. A fixed-side rotor core fixed to the shaft, and a rotating-side rotor core mounted adjacent to the fixed-side rotor core in the axial direction so as to be rotatable relative to the fixed-side rotor core; The rotating rotor core rotates relative to the fixed rotor core in accordance with electromagnetic torque acting on the rotor.
According to a second aspect of the present invention, in the rotating electrical machine according to the first aspect, the fixed-side rotor core is formed with a recess formed on a surface facing the rotating-side rotor core, and a circle is formed in the recess. A plurality of pins that are press-fitted and fixed along a circumferential direction, and the rotating-side rotor core is provided with a stepped portion that fits into a recessed portion of the fixed-side rotor core; and the stepped portion A convex portion formed on the inner diameter side of the plurality of convex shapes, a coil spring inserted into a guide groove between the plurality of convex portions, and a guide groove between the coil spring and the convex portion. And a spring seat having a hole for locking the pin and biased by the coil spring. It is characterized by having.
According to a third aspect of the present invention, in the rotating electric machine according to the first or second aspect, the field magnets provided on the two sets of rotor cores have magnetic poles having different polarities sequentially in the rotation direction. It is characterized by that.
According to a fourth aspect of the present invention, in the rotating electrical machine according to the first or second aspect, the rotating-side rotor core has a small field magnetic flux when the torque is small, and a field magnet when the torque is large. The magnetic flux rotates relative to the fixed-side rotor core so as to increase the magnetic flux.
According to a fifth aspect of the present invention, in the rotating electrical machine according to the first or second aspect, when the torque is small, the rotor acts between the two sets of rotor cores or the coil spring. Due to the urging force, the two magnetic poles of the two sets of rotor cores rotate relative to each other so as to be aligned in the axial direction, and the field magnetic flux is reduced.
According to a sixth aspect of the present invention, in the rotating electrical machine according to the second aspect of the present invention, the guide groove into which the coil spring is inserted is filled with grease, and the step portion of the rotating side rotor core is provided. A seal member for preventing leakage of the grease is provided on the surface facing the fixed-side rotor core.
Further, the invention according to claim 7 is the rotating electrical machine according to claim 1 or 2, wherein the load-side bearing that axially supports the load side of the rotating shaft at the axial end of the fixed-side rotor core. It is characterized in that a collar portion for fixing the position in the axial direction is provided.
According to an eighth aspect of the present invention, in the rotating electric machine according to the first aspect, the magnetic pole of the rotating magnetic field generated by the stator is the largest relative to the position of the magnetic pole of the rotating side rotor core. It is provided at a position where torque is generated.

According to the first and second aspects of the invention, the rotor has two sets of rotor cores, that is, a fixed side and a rotating side, and the rotating side rotor core is in accordance with electromagnetic torque acting on the rotor. Since the relative rotation with respect to the fixed-side rotor core is performed, the field magnetic flux is changed according to the magnitude of the load, and a rotating electric machine without unnecessary loss can be provided.
According to the third aspect of the present invention, since the rotor core is provided with the field magnets so that each of the rotor cores has sequentially different magnetic poles in the rotation direction, the stator winding can be wound with a small relative rotation. It is possible to greatly change the field magnetic flux linked to the magnetic field.
According to a fourth aspect of the present invention, the rotating-side rotor core has a fixed-side rotor core so that the field magnetic flux is small when the torque is small and the field magnetic flux is large when the torque is large. Therefore, an appropriate field magnetic flux according to the load can be obtained.
According to a fifth aspect of the present invention, when the torque is small, the rotor has two sets of rotor cores by a torque acting between the two sets of rotor cores or an urging force of an installed spring. Therefore, a rotating electrical machine having a rotor with a simple structure and no unnecessary loss can be provided.
According to the sixth aspect of the present invention, grease is filled in the guide groove which is a mounting portion of the coil spring, and the stepped portion of the rotating-side rotor core faces the fixed-side rotor core. The seal member for preventing the leakage of grease is provided on the rotating side rotor core, so that the grease is secured inside the rotor core of the rotating side, the durability of the coil spring and the spring seat in the guide groove is obtained, and the grease damper Abnormal vibration can be suppressed by the effect and the frictional resistance of the seal member provided at the stepped portion.
According to the invention of claim 7, since the flange portion provided on the inner peripheral side of the fixed-side rotor core contacts the inner ring of the load-side bearing and acts as a bearing press, the axial direction of the load-side bearing Can be securely fixed.
According to the invention described in claim 8, the magnetic pole of the rotating magnetic field produced by the stator of the rotating electrical machine is provided at a position where the maximum torque is generated with respect to the position of the magnetic pole of the rotating rotor core. Therefore, an appropriate field magnetic flux can be obtained regardless of the rotation position of the rotation-side rotor core.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an axial sectional view of an electric motor according to a first embodiment of the present invention. FIG. 2 is a front sectional view of the electric motor shown in FIG. It corresponds to the figure seen from the side. FIG. 3 is an exploded perspective view in which the fixed-side rotor core and the rotating-side rotor core constituting the rotor of FIG. 1 are disassembled.
In addition, a present Example assumes the electric motor with which it uses for the use which repeats starting and a stop with high frequency, such as a spindle motor. The electric motor has a structure suitable for driving only the right rotation side when the rotation direction is viewed from the load side of the rotation shaft.
1 to 3, R is a rotor, S is a stator, 1 is a fixed rotor core, 1a is a flange, 1b is a recess, 2 is a rotating rotor core, 2a is a step, and 2b is a step. Convex part, 2c is a guide groove, 3 and 4 are field magnets, 5 is a rotating shaft, 6 is a pin, 7 is a spring seat, 7a is a hole, 8 is a coil spring, 9 and 10 are O-rings, 11 is A stator core, 12 is a stator winding, 20 is a load side bearing, 21 is an anti-load side bearing, 22 is a circuit board, and 23 is a rotational position detector.

The features of the present invention are as follows.
That is, a stator S formed by winding a stator winding 12 around a stator core 11, and a stator S and a magnetic gap, and a rotor having field magnets 3 and 4 on the rotor core. In the electric motor having the rotor R, the rotor R is fixed adjacent to the fixed-side rotor core 1 in the axial direction, as shown in FIG. 1, and the fixed-side rotor core 1 fixed to the rotary shaft 5. There are provided two sets of rotor cores including a rotation side rotor core 2 mounted so as to be rotatable relative to the side rotor core 1. Further, as shown in FIGS. 1 and 3, the fixed-side rotor core 1 is provided with the field magnets 3 so as to have eight magnetic poles that are sequentially different in the rotation direction, and similarly, the rotating-side rotor. The iron core 2 is also provided with field magnets 4 so as to have eight magnetic poles having different polarities in the rotation direction.
Then, as shown in FIGS. 1 to 3, one fixed-side rotor core 1 includes a recess 1 b formed on the surface facing the rotating-side rotor core 2, and the recess 1 b in the circumferential direction. And a plurality of pins 6 that are press-fitted and fixed along. Further, as shown in FIGS. 1 to 3, the other rotating-side rotor core 2 includes a stepped portion 2 a provided so as to be fitted to the recessed portion 1 b of the fixed-side rotor core 1, and an inner diameter of the stepped portion. A convex portion 2b formed on a plurality of convex sides, a coil spring 8 inserted into a guide groove 2c between the plurality of convex portions 2b, and a guide groove 2c between the coil spring 8 and the convex portion 2b. And a spring seat 7 having a hole 7 a for locking the pin 6 and biased by the coil spring 8. The rotating side rotor core 2 rotates relative to the fixed side rotor core 1 according to the electromagnetic torque acting on the rotor R, and the field magnetic flux changes according to the magnitude of the load. It has a structure.
That is, the rotation-side rotor core 2 rotates relative to the fixed-side rotor core 1 so that the field magnetic flux is small when the torque is small and the field magnetic flux is large when the torque is large.
Further, the guide groove 2c into which the coil spring 8 is inserted is filled with grease, and the grease is held on the side of the stepped portion 2a of the rotating side rotor core 2 facing the fixed side rotor core 1. O-rings 9 and 10 are provided as seal members for preventing leakage of grease.
In addition, a flange portion 1 a that fixes the axial position of the load-side bearing 20 that axially supports the load side of the rotary shaft 5 is provided at the axial end portion of the fixed-side rotor core 1.

FIG. 4 is an explanatory view showing the principle of changing the field magnetic flux of the rotor of the first embodiment, where (a) is at low torque, (b) is at torque increase, and (c) is at high torque. This is the case.
As shown in FIG. 4, in a rotor having a fixed-side rotor core 2 having a field magnet 3 and a rotating-side rotor core 4 having a field magnet 4, the rotor is at low torque. Is relatively rotated so that the different magnetic poles of the two sets of rotor cores are approximately aligned in the axial direction due to the torque acting between the two sets of rotor cores or the biasing force of the coil spring. When the torque increases, it rotates in the direction opposite to the biasing force of the spring and in the rotational direction of the rotor, thereby strengthening the field magnetic flux. Further, at the time of high torque, the same magnetic poles of the two sets of rotor cores are aligned in the axial direction, and the field magnetic flux becomes large.

FIG. 5 is an explanatory diagram of the magnetic pole position of the rotating magnetic field according to the first embodiment.
In FIG. 5, θe is a relative rotation angle between the fixed-side field magnet 3 and the rotating-side field magnet 4 shown at the time of low torque in FIG. 4. Proper provision of θe adjusts the no-load maximum rotation speed of the motor and facilitates startup. The magnetic pole of the rotating magnetic field created by the stator flows a load current to the electric motor so as to be provided at an appropriate position with respect to the position of the magnetic pole of the rotating rotor core 2.
5 indicates the relative angle of the magnetic pole center of the rotating magnetic field that is optimal for driving the rotating rotor core 2 with respect to the magnetic pole center of the rotating rotor core 2.
As a method of providing the magnetic field of the rotating magnetic field at an appropriate position with respect to the position of the magnetic pole of the rotating-side rotor core 2, as shown in the rotating position detector 23 shown in FIG. For example, the magnetic pole position of the rotating magnetic field is adjusted to a position where the maximum torque is generated with respect to the magnetic pole position on the rotating side corresponding to the load current of the electric motor investigated in advance. Alternatively, a rotational position detection unit may be provided at a position indicated by 22a on the circuit board 22, and the magnetic pole position on the rotation side may be directly detected, and the magnetic pole position of the rotating magnetic field may be appropriately adjusted with respect to that position.

FIG. 6 is an explanatory diagram of acceleration characteristics of the electric motor according to the first embodiment.
As shown in FIG. 6, the acceleration characteristic F of the electric motor of the present invention can achieve both sufficient acceleration and high rotation. The acceleration characteristic G of a conventional motor that does not change the field magnetic flux is good for acceleration, but cannot be driven to high rotation due to voltage saturation.
The acceleration characteristic H of the electric motor adjusted to a high rotation speed is deteriorated even if a desired high rotation speed is obtained.

FIG. 7 shows the relative rotation angle characteristic of the torque constant of the electric motor according to the first embodiment.
FIG. 7 shows the ratio of the torque constant to the maximum value with respect to the electrical angle of the relative rotation angle θe. As shown in the figure, the torque constant increases as the relative rotation angle increases.

Therefore, in the first embodiment of the present invention, the rotor has two sets of rotor cores, the fixed side and the rotating side, and the rotating side rotor core is fixed on the fixed side according to the electromagnetic torque acting on the rotor. Since it rotates relative to the rotor core, the field magnetic flux is changed according to the magnitude of the load, and a rotating electric machine without unnecessary loss can be provided.
In addition, since the rotor cores are provided with field magnets so that each of them has different magnetic poles in the direction of rotation, the field magnetic flux linked to the stator windings changes greatly with a small relative rotation. Can be made.
Further, a seal member for filling the guide groove, which is a mounting portion of the coil spring, with grease, and preventing leakage of grease on the surface of the stepped portion of the rotating side rotor core facing the fixed side rotor core. Therefore, the grease is secured inside the rotor core of the rotating side, the durability of the coil spring and spring seat in the guide groove can be obtained, the damper effect of grease and the frictional resistance of the seal member provided in the stepped portion Thus, abnormal vibration can be suppressed.
Further, since the flange portion provided on the inner peripheral side of the fixed-side rotor core contacts the inner ring of the load-side bearing and acts as a bearing press, the axial position of the load-side bearing can be reliably fixed. .

FIG. 9 is a front sectional view of a rotor of an electric motor showing a second embodiment of the present invention.
The second embodiment of the present invention differs from the first embodiment in that the two pins 16 fixed to the stationary rotor core and the spring seat 17 inserted in the guide groove of the rotating rotor core are The rotating side rotor core 13 is bidirectionally driven, and the different magnetic poles of the two sets of rotor cores are completely aligned in the axial direction when there is no load.
As in the first embodiment, in order to appropriately adjust the magnetic field of the rotating magnetic field with respect to the field magnet 14 on the rotating side, the magnetic pole is driven positively when driven rightward as shown in the figure. The position of the magnetic field 25 of the rotating magnetic field is used, and when driving to the left rotation side, the position 26 of the magnetic field of the rotating magnetic field during reverse rotation is used.

FIG. 10 shows a rotor of an electric motor according to a third embodiment of the present invention, in which (a) is a front sectional view and (b) is a side sectional view.
The third embodiment of the present invention is different from the first embodiment in that a motor with an embedded magnet structure is used instead of a motor with a surface magnet structure, and in particular, an embodiment that pays attention to reduction of iron loss at high rotation. It is.
Specifically, the rotor is configured by dividing the rotor cores 31 and 32 into which the field magnet 34 is inserted and the holding members 35 and 36 that support the rotor cores 31 and 32. The field magnet 34 is inserted into the two sets of rotor cores 31 and 32 in a V shape to create magnetic poles on the surface of the rotor core.
Although this embodiment is a permanent magnet motor, it can achieve both a high starting torque and a high rotation. Generally, a high motor such as a motor for home appliances such as a vacuum cleaner and an air towel, or a motor for tools such as an impact driver and a grinder is used. It is useful for applications that achieve both starting torque and high rotation.

FIG. 11 is an explanatory diagram of the principle that the field magnetic flux of the rotor of the third embodiment changes.
As shown in the figure, the mechanism for changing the field magnetic flux is the same as that of the first embodiment. As shown in FIG. 11A, the rotation-side rotor core 42 rotates on the fixed side as the drive torque increases. It rotates so that the same magnetic pole as the core iron core 41 is aligned. When the different magnetic poles of the two sets of rotor cores in FIG. 11B are aligned in the axial direction, the magnetic flux of the field magnet is short-circuited in the rotor core, and the field magnetic flux to the outside of the rotor is extremely reduced. Decrease. Therefore, iron loss can be significantly reduced.

FIG. 12 is an explanatory diagram of acceleration characteristics of the electric motor according to the third embodiment.
As shown in the figure, the acceleration characteristic F of the electric motor of the present invention can achieve both sufficient acceleration and high rotation. The acceleration characteristic G of a conventional motor that does not change the field magnetic flux is good in acceleration but cannot be driven to a high speed due to induced voltage saturation. The acceleration characteristic H of a conventional electric motor with a commutator of the same size is inferior in starting torque even if a desired high rotation is obtained, and therefore acceleration is worse.

  By using the present invention for an industrial rotating electrical machine, a magnetic flux can be changed according to the magnitude of the load regardless of the rotational speed of the rotor, and a rotor having a simple structure without unnecessary loss. It becomes possible to provide a rotating electric machine having the above, and workability is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an axial sectional side view of an electric motor showing a first embodiment of the present invention. It is a front sectional view of the electric motor shown in FIG. It is the disassembled perspective view which decomposed | disassembled the fixed side rotor core and the rotation side rotor core which comprise the rotor of FIG. It is explanatory drawing which showed the principle which the magnetic field magnetic flux of the rotor of 1st Example changes, Comprising: (a) at the time of low torque, (b) at the time of torque increase, (c) at the time of high torque. is there. It is explanatory drawing of the magnetic pole position of the rotating magnetic field by 1st Example. It is explanatory drawing of the acceleration characteristic of the electric motor by 1st Example. It is the relative rotation angle characteristic of the torque constant of the electric motor by 1st Example. It is the figure which showed the relationship of the induced voltage with respect to the general rotational speed. It is a front sectional view of a rotor of an electric motor showing a second embodiment of the present invention. FIG. 6 is a rotor of an electric motor showing a third embodiment of the present invention, where (a) is a front sectional view and (b) is a side sectional view. It is principle explanatory drawing in which the field magnetic flux of the rotor of 3rd Example changes. It is explanatory drawing of the acceleration characteristic of the electric motor of 3rd Example. It is a disassembled perspective view of the rotary electric machine which has a rotor of the embedded magnet structure which shows a 1st prior art, Comprising: (A) is a low rotation, (B) is a case of high rotation. It is a front view of the rotary electric machine which has a rotor of the surface magnet structure which shows a 2nd prior art.

Explanation of symbols

R rotor,
S stator,
1 Fixed rotor core,
1a collar part,
1b recess,
2 Rotating side rotor core,
2a steps,
2b convex part,
2c guide groove,
3, 4 field magnets,
5 rotation axis,
6 pins,
7 Spring seat,
7a hole,
8 Coil spring
9, 10 O-ring,
11 Stator core,
12 Stator winding,
20 Load-side bearing 21 Anti-load-side bearing 22 Circuit board 23 Rotation position detection unit 24 Magnetic field of rotating magnetic field 25 Magnetic pole of rotating magnetic field during normal driving 26 Magnetic pole of rotating magnetic field during reverse driving 31 Fixed rotor core 32 Rotating rotor Iron core 34 Rotating side field magnet 35 Fixed side holding member 36 Rotating side holding member 41 Fixed side rotor core 42 Rotating side rotor core

Claims (8)

In a rotating electrical machine having a stator formed by winding a stator winding around a stator core, and a rotor provided with a field magnet on the rotor core,
The rotor includes a fixed-side rotor core fixed to a rotation shaft, and a rotation mounted adjacent to the fixed-side rotor core in the axial direction so as to be rotatable relative to the fixed-side rotor core. A side rotor core and two pairs of rotor cores are provided.
A rotating electrical machine characterized in that the rotating-side rotor core rotates relative to the fixed-side rotor core in accordance with electromagnetic torque acting on the rotor. The fixed-side rotor core is provided with a recess formed on the surface facing the rotating-side rotor core, and a plurality of pins press-fitted and fixed along the circumferential direction in the recess.
The rotating-side rotor core includes a stepped portion provided so as to be fitted to a recessed portion of the fixed-side rotor core, a convex portion formed by forming the inner diameter side of the stepped portion into a plurality of convex shapes, A coil spring inserted into a guide groove between a plurality of convex portions, a hole inserted into the guide groove between the coil spring and the convex portion and for locking the pin, and A spring seat biased by a coil spring; The rotating electrical machine according to claim 1, comprising:   3. The rotating electrical machine according to claim 1, wherein the field magnets provided on the two sets of rotor cores have magnetic poles having different polarities sequentially in a rotation direction.   The rotating-side rotor core rotates relative to the fixed-side rotor core so that the field magnetic flux is small when the torque is small and the field magnetic flux is large when the torque is large. The rotating electrical machine according to claim 1, wherein:   When the torque is small, the rotor is relatively positioned so that different magnetic poles of the two sets of rotor cores are aligned in the axial direction by the torque acting between the two sets of rotor cores or the biasing force of the coil spring. The rotating electrical machine according to claim 1 or 2, wherein the rotating electrical machine rotates to reduce field magnetic flux. Grease is filled in the guide groove into which the coil spring is inserted,
3. The rotating electrical machine according to claim 2, wherein a sealing member for preventing leakage of the grease is provided on a surface of the stepped portion of the rotating side rotor core facing the fixed side rotor core. .   The collar part which fixes the position of the axial direction of the load side bearing which axially supports the load side of the said rotating shaft was provided in the axial direction edge part of the said fixed side rotor core, The Claim 1 or 2 characterized by the above-mentioned. The rotating electrical machine described.   2. The rotating electrical machine according to claim 1, wherein the magnetic pole of the rotating magnetic field generated by the stator is provided at a position where the maximum torque is generated with respect to the position of the magnetic pole of the rotating rotor core.

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