JP2007259531A - Dynamo-electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamo-electric machine which has a rotor of built-in magnet structure without abnormal vibration, being operating with high efficiency even in a high revolution range, by reducing the magnetic flux of a field without increase of the axial size of the rotor. <P>SOLUTION: The dynamo-electric machine is provided with a third rotor 3 which can relatively rotate adjacently between the first rotor core 1 and the second rotor core 2 fixed to the load side and the anti-load side in the axial direction of a rotating shaft 4, via air gaps from a plurality of stator magnetic poles 17. Furthermore, it is provided with a mechanism which has guide grooves 6a, 7a, and 8a inclined in its circumferential direction, centrifugal plumbs 5 which are inserted in each guide groove and shift within the guide grooves, receiving centrifugal force by the rotation of the rotor, and torsion springs 9 whose one end each is set in each guide groove 8a provided in the retaining member of the third rotor core 3 and whose other end each is set in the groove provided in the rotating shaft 4 and also energizes it in a direction opposite to the rotational direction, witin a plurality of retaining members 6, 7 and 8 which are fixed to the internal perimeters of the rotor cores 1, 2 and 3. The guide grooves and the centrifugal plumbs are as many as the magnetic poles of the rotor cores. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine having a rotor with an embedded magnet structure that changes a field magnetic flux in accordance with the rotational speed of the rotor.

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,
1142846194317_0
As shown, a pair of spiral guide grooves 124 for rotation are provided. The grooves 124 are arranged 180 degrees symmetrically,
1142846194317_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.
Japanese Patent Laid-Open No. 11-46471 (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.
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 mechanism for changing the field magnetic flux in accordance with the rotational speed of the rotor is generally provided, so that a resonance phenomenon due to a frequency unique to the mechanism, so-called abnormal vibration is likely to occur. There was also a problem.
The present invention has been made in view of such a problem, and without increasing the axial size of the rotor, the magnetic field magnetic flux is reduced to operate with high efficiency even in a high rotation operation region, and there is no abnormal vibration. It aims at providing the rotary electric machine which has a rotor of a magnet structure.

In order to solve the above problems, the present invention is configured as follows.
The invention described in claim 1
A fixed rotor fixed to the rotating shaft, and a movable rotor mounted adjacent to the fixed rotor in the axial direction so as to be rotatable relative to the fixed rotor,
In an embedded magnet type motor that is provided inside a rotor core that constitutes each of the rotors and that has a field magnet in a substantially V-shaped magnet insertion hole that is convex radially inward,
A plurality of holding members are fixed to the inner periphery of each of the rotor cores,
Inside the holding member, a plurality of guide grooves inclined in the circumferential direction, and inserted in the guide grooves, and moved in the guide grooves by receiving centrifugal force due to the rotation of the movable rotor. The centrifugal weight and one end are locked inside the guide groove provided in the holding member of the movable rotor, and the other end is locked in the groove provided in the rotating shaft and are opposite to the rotation direction. And a mechanism having a spring biasing in the direction,
The number of the guide grooves and the centrifugal weights is the same as the number of magnetic poles of the rotor core.
The invention according to claim 2 is the rotating electrical machine according to claim 1,
Comprising at least two movable rotors which are mounted adjacent to each other in the axial direction of the rotary shaft and which are rotatable relative to each other;
In an embedded magnet type motor that is provided inside a rotor core that constitutes each of the rotors and that has a field magnet in a substantially V-shaped magnet insertion hole that is convex radially inward,
A plurality of holding members are fixed to the inner periphery of each of the rotor cores,
Inside the holding member, a plurality of guide grooves inclined in the circumferential direction, and inserted in the guide grooves, and moved in the guide grooves by receiving centrifugal force due to the rotation of the movable rotor. The centrifugal weight and one end are locked inside the guide groove provided in the holding member of the movable rotor, and the other end is locked in the groove provided in the rotating shaft and are opposite to the rotation direction. And a mechanism having a spring biasing in the direction,
The number of the guide grooves and the centrifugal weights is the same as the number of magnetic poles of the rotor core.
The invention as set forth in claim 3 is the rotating electrical machine according to claim 1,
In the case where the rotating electrical machine is an electric motor, the circumferential direction of the guide groove provided on the holding member of the movable rotor is the circumferential direction of the guide groove provided on the holding member of the fixed rotor. Conversely, the rotating direction of the movable rotor due to the centrifugal force is opposite to the rotating direction of the rotor of the electric motor.
According to a fourth aspect of the present invention, in the rotating electrical machine according to the first aspect,
In the case where the rotating electrical machine is a generator, the circumferential direction of the guide groove provided in the holding member of the movable rotor is the circumferential direction of the guide groove provided in the holding member of the fixed rotor. On the contrary, the rotating direction of the movable rotor due to the centrifugal force is the rotating direction of the rotor of the generator.
Further, the invention according to claim 5 is the rotary electric machine according to claim 1 or 2,
The mounting portion where the centrifugal weight and the spring in the guide groove constituting the mechanism are arranged is filled with grease,
A fitting portion is provided in an adjacent portion of the holding member provided in the fixed rotor with respect to the holding member of the movable rotor, and a seal member for preventing leakage of the grease is provided in the fitting portion. Yes.

According to the first aspect of the present invention, the mechanism for relatively rotating the movable rotor inside the movable rotor that is relatively rotatable adjacent to the fixed rotor fixed in the axial direction of the rotation shaft. Therefore, the field magnetic flux linked to the stator winding can be greatly changed without increasing the axial size of the rotor.
Also, the rotor balances the rotational force acting on the centrifugal weight with the spring force biased in the direction opposite to the rotational direction, and generates an appropriate field magnetic flux according to the rotational speed of the rotor. Obtainable.
In addition, since each holding member has a guide groove, the shape of each guide groove can be designed to be short in the direction of rotation, and the rotating electrical machine can be designed in a limited space of the rotor.
In addition, since there are as many centrifugal weights as the number of magnetic poles of the rotor core, the required relative rotation angle can be obtained and the mass of the centrifugal weight can be designed to a minimum, and the rotating electrical machine can be installed in a limited space of the rotor. Can design.
According to the second aspect of the present invention, since there is a mechanism for relatively rotating the movable rotors that are mounted to be adjacent to each other in the axial direction of the rotation shaft and that can rotate relative to each other, the size of the rotor in the axial direction is increased. The field magnetic flux interlinking with the stator windings can be changed greatly without increasing.
Also, the rotor balances the rotational force acting on the centrifugal weight with the spring force biased in the direction opposite to the rotational direction, and generates an appropriate field magnetic flux according to the rotational speed of the rotor. Obtainable.
In addition, since each holding member has a guide groove, the shape of each guide groove can be designed to be short in the direction of rotation, and the rotating electrical machine can be designed in a limited space of the rotor.
In addition, since there are as many centrifugal weights as the number of magnetic poles of the rotor core, the required relative rotation angle can be obtained and the mass of the centrifugal weight can be designed to a minimum, and the rotating electrical machine can be installed in a limited space of the rotor. Can design.
According to the invention described in claim 3, the circumferential direction of the guide groove provided in the holding member of the movable rotor is opposite to the circumferential direction of the guide groove provided in the holding member of the fixed rotor, Since the rotating direction of the movable rotor due to the centrifugal force is opposite to the rotating direction of the rotor of the electric motor, the field magnetic flux can be increased as the load torque increases, and the rotation of the rotor An appropriate field magnetic flux can be obtained with respect to speed and load torque.
According to the invention described in claim 4, the circumferential direction of the guide groove provided in the holding member of the movable rotor is opposite to the circumferential direction of the guide groove provided in the holding member of the fixed rotor, Since the rotating direction of the movable rotor due to the centrifugal force is the rotating direction of the generator rotor, the field magnetic flux can be increased as the load torque increases, and the rotational speed of the rotor is increased. Thus, an appropriate field magnetic flux can be obtained with respect to the load torque.
According to the invention described in claim 5, the mounting portion of the centrifugal weight and the spring is filled with grease, and the fitting portion is provided adjacent to the relatively rotating holding member, and the fitting portion has the grease. Since the seal member is provided, the grease is secured inside the holding member, the durability of the sliding portion of the centrifugal weight and the guide groove can be obtained, the damper effect of the grease and the friction resistance of the seal member provided in the fitting portion Thus, abnormal vibration can be suppressed.

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

FIG. 1 is an axial sectional view of a rotating electrical machine showing a first embodiment of the present invention, FIG. 2 is an axial sectional view showing the inside of a holding member of a third rotor core of the present invention, and FIG. It is a disassembled perspective view of the component of a child. In addition, a present Example demonstrates an electric motor.
In the figure, R is a rotor, S is a stator, 1 and 2 are first and second rotor cores constituting a fixed rotor fixed to the load side and the anti-load side of the rotary shaft, and 3 is a movable rotation. 3rd rotor iron core which comprises a child, 4 is a rotating shaft, 5 is a centrifugal weight, 6 is a load side holding member, 6a is a guide groove of a load side holding member, 6b is a collar part of a load side holding member, 6c is holding A fitting portion of the member, 7 is an anti-load side holding member, 7a is a guide groove of the anti-load side holding member, 7b is a collar portion of the anti-load side holding member, 7c is a fitting portion of the holding member, and 8 is a rotation side. A holding member, 8a is a guide groove of the rotating side holding member, 8d is a torsion spring mounting hole of the rotating side holding member, 9 is a torsion spring, 10 is a rotational position detector, 11 is a load side field magnet, and 12 is Anti-load-side field magnet, 13 is a rotation-side field magnet, 14 is an O-ring, 15 is a load-side bearing, 6 is a counter-load-side bearing.

As shown in FIGS. 1 and 2, the stator S includes a plurality of stator magnetic poles 17 and windings 18 for generating a rotating magnetic field wound around the stator magnetic poles 17.
As shown in FIGS. 1 to 3, the rotor R is basically provided via a plurality of stator magnetic poles 17 and gaps, and is fixed to the axial load side and the anti-load side of the rotary shaft 4. The first rotor core 1 and the second rotor core 2 are provided adjacent to the first rotor core 1 and the second rotor core 2, and the first and second rotor cores 1 and 2 are provided in the first and second rotor cores 1 and 2. The third rotor core 3 is configured to be relatively rotatable with respect to the third rotor core 3. In each of the rotor cores 1, 2, 3, field magnets 11, 12 having different magnetic poles sequentially in the circumferential direction in a convex and substantially V-shaped magnet insertion hole provided radially inward. 13 are embedded, and a plurality of holding members 6, 7, 8 are fixed to the inner periphery of the rotor cores 1, 2, 3 respectively.
As shown in FIG. 1, guide members 6a, 7a, 8a inclined in the circumferential direction and guide grooves 6a, 7a, 8a are inserted into the holding members 6, 7, 8 and rotated. The centrifugal weight 5 that receives the centrifugal force by the rotation of the child and moves in the guide groove, and one end locked inside the guide groove 8a provided in the holding member of the third rotor core 3, and the other end Is held in a groove provided on the rotary shaft 4 and a mechanism having a torsion spring 9 that biases in a direction opposite to the rotational direction is provided.

The guide groove and the centrifugal weight 5 provided in the mechanism that relatively rotates the rotor will be described.
The number of guide grooves provided in each holding member is the same as the number of magnetic poles of the rotor core. First, the circumferential direction of the guide groove 8a provided in the rotating side holding member 8 is opposite to the circumferential direction of the guide groove 6a of the load side holding member and the guide groove 7a of the anti-load side holding member. Thus, the rotating direction of the movable rotor due to the centrifugal force is opposite to the rotating direction of the rotor of the electric motor.
Next, as shown in FIG. 3, the number of the centrifugal weights 5 is the same as the number of magnetic poles (eight pieces) of each of the rotor cores 1, 2, and 3, similarly to the guide groove. Therefore, the necessary relative rotation angle can be obtained, and the mass of the centrifugal weight for obtaining the required turning force can be dispersed, which makes it easy to design to the minimum. Further, since the centrifugal weight 5 has a rod shape with a uniform shaft diameter, it can be designed to a minimum size with respect to a required mass, and a mechanism having a required turning force is provided in a limited space of the rotor. Making it easy. In addition, since the shape is simple, it can be manufactured at low cost, and existing parts with high accuracy and high wear resistance such as needle pins of needle bearings can be used to reduce development costs.

  Further, grease is filled in the attachment portion of the centrifugal weight 5 and the torsion spring 9 provided in the guide groove, so that the torsion spring inserted between the rotating shaft and each holding member is lubricated well.

  When assembling the rotor, first, the anti-load side holding member 7 provided with the second rotor core 2 on the outer periphery is press-fitted and fixed to the rotating shaft 4, and the side opposite to the flange portion 7b of the anti-load side holding member is fixed. A torsion spring 9 is inserted into a gap between the rotary shaft 4 and the rotary shaft 4. Next, the rotating side holding member 8 having the third rotor core 3 on the outer periphery is inserted into the rotating shaft 4 so as to be adjacent to the anti-load side holding member 7 and the torsion spring 9. And the load side holding member 6 provided with the 1st rotor core 1 on the outer periphery is inserted in the rotating shaft 4 so that the rotation side holding member 8 and the torsion spring 9 may be adjoined.

  The centrifugal weight 5 provided on the holding member of each of the rotor cores is positioned on the rotating shaft side by the urging of the torsion spring 9 when the rotational speed is low, but when the rotational speed of the rotor increases, the centrifugal weight 5 The centrifugal force acting on the torsion spring 9 exceeds the urging force of the torsion spring 9, and the centrifugal weight 5 moves toward the outer periphery of the rotor to relatively rotate the rotor core. That is, the mechanism rotates the three rotor cores relative to each other as the rotational speed of the rotor changes.

FIG. 9 is an explanatory diagram of the force that the driving torque acts on the centrifugal weight.
In the figure, 8a indicates a guide groove of the movable side holding member, 7a indicates a guide groove of the anti-load side holding member, and 5 indicates a centrifugal weight.
The figure shows a state in which a load torque is generated in a balanced state by a centrifugal force (not shown) acting on the centrifugal weight and a biasing force of the torsion spring 9 at a certain rotational speed. As a reaction of the load torque, a driving torque is generated in the rotating direction of the rotor on the movable side holding member. The driving torque acts as a force that pushes the centrifugal weight back inward in the radial direction from the guide groove 8a of the movable side holding member, and as a result, the movable side holding member rotates so as to be opposite to the rotation direction due to the action of the centrifugal force. To do. Therefore, the field magnetic flux increases as the load torque increases. This action makes it possible to obtain an appropriate field magnetic flux with respect to the rotational speed and load torque of the rotor. In general, when an electric motor is driven at a high speed using vector control, the maximum efficiency control is often performed at a low load, and the maximum output control is often performed at a high load. Increasing the field magnetic flux in response to an increase in load torque can achieve higher efficiency in maximum efficiency control and greater maximum output in maximum output control.

  Although not shown, when one of the holding members is a generator that rotates relative to the rotating shaft of the rotor, the circumferential direction of the guide groove provided in the holding member of the movable rotor is set to hold the fixed rotor. The direction of rotation of the movable rotor due to the centrifugal force of the movable rotor is set to be the direction of rotation of the rotor of the generator, opposite to the circumferential direction of the guide groove provided on the member. The relationship between the load torque and the drive torque is reversed from that in the case of the electric motor, and the field magnetic flux increases as the load torque increases as in the case of the electric motor. This action makes it possible to obtain an appropriate field magnetic flux with respect to the rotational speed and load torque of the rotor.

In FIG. 1, grease is filled in the attachment portion of the centrifugal weight 5 and the torsion spring 9, and the holding members provided in the first rotor core 1 and the second rotor core 2 with respect to the holding member of the third rotor core 3. The adjacent portions have the fitting portions 6c and 7c, and the fitting portion is provided with an O-ring 14 which is a seal member for preventing leakage of grease.
Therefore, grease is secured inside the holding member, the durability of the sliding portion of the centrifugal weight and the guide groove can be obtained, and due to the damper effect of grease and the frictional resistance of the O-ring provided in the fitting portion, Abnormal vibration due to the provision of a mechanism for changing the field magnetic flux in accordance with the rotational speed of the rotor can be suppressed.
In the figure, the holding member 6 and the anti-load-side holding member 7 are a flange portion 6b of the load-side holding member and a flange portion 7b of the anti-load-side holding member, which are shafts of the load-side bearing 15 and the anti-load-side bearing 16. It also has a function to fix the position of the direction.

4A and 4B are diagrams for explaining the state of the rotor at the time of low rotation, where FIG. 4A is a perspective view of the rotor, and FIG. 4B is a front view of FIG. It is shown as an example.
When the rotation speed of the rotor is low, the same magnetic poles of the plurality of rotor cores 1, 2, and 3 are aligned in the axial direction, so that the field magnetic flux is in the maximum state.

5A and 5B are diagrams for explaining the state of the rotor when the rotation is increased, in which FIG. 5A is a perspective view of the rotor, and FIG. 5B is a front view of FIG. It is shown as an example.
When the rotation speed increases, the centrifugal force acting on the centrifugal weight 5 increases, and the relative rotation with respect to the first and second rotor cores 1 and 2 to which the rotation-side rotor core 3 is fixed.

FIGS. 6A and 6B are diagrams for explaining the state of the rotor during high rotation, where FIG. 6A is a perspective view of the rotor, and FIG. 6B is a front view of FIG. It is shown as an example.
When the rotational speed of the rotor is high, the different magnetic poles of the plurality of rotor cores 1, 2, and 3 are aligned in the axial direction, whereby the magnetic flux generated by the field magnet is short-circuited in the rotor core, and the field magnetic flux is reduced. Decrease.
As a result, the iron loss generated in the stator can be sufficiently reduced, and a rotating electrical machine that operates with high efficiency even in a high rotation operation region can be provided.

FIGS. 7A and 7B are explanatory diagrams of the combined magnetomotive force with respect to the relative rotational electrical angle of the plurality of rotor cores. FIG. 7A shows a case of low rotation and FIG.
When the rotation is relatively low, the same magnetic poles are approximately aligned in the axial direction, so that the combined magnetomotive force ratio is large with respect to the magnetomotive force of the field magnet of each rotor core. When the rotation is relatively high, different magnetic poles are roughly aligned in the axial direction, so that the synthesized magnetomotive force ratio is small. Corresponding to the change of the synthetic magnetomotive force, the field magnetic flux changes.

10A and 10B are explanatory views of a rotor of a rotating electrical machine showing a second embodiment of the present invention, in which FIG. 10A is a perspective view thereof, and FIG. 10B is a front view of FIG. This part is schematically shown.
The figure shows the rotor during high rotation, and the components of the rotor and their functions are the same as in the first embodiment. In the electric motor shown in the second embodiment, the difference from the first embodiment is that the shapes of the guide grooves 7a and 8a of the rotor core and 6a (not shown) are changed to be slightly smaller than those of the first embodiment. The maximum value of the relative rotation angle is limited, and the minimum value of the field magnetic flux is restricted by preventing the three magnetic poles of the three rotor cores from rotating until they are completely aligned in the axial direction. This is effective when voltage saturation is used to limit the maximum rotational speed of the electric motor.
Although not shown, the same magnetic poles of the rotor cores 1, 2, and 3 may not be perfectly aligned in the axial direction when the field magnetic flux at the time of low rotation is maximized. This is a case where the relative rotation angle is 0 when the magnetic pole of the rotor core is shifted by an appropriate amount as a countermeasure against cogging torque during low rotation.

FIG. 11 is an explanatory view of a rotor of a rotating electrical machine showing a third embodiment of the present invention.
In FIG. 11, 21 is a first rotating rotor core, 22 is a second rotating rotor core, 23 is a third rotating rotor core, 24 is a rotating shaft, 25 is a centrifugal weight, 26 is a load side plate, 26a is a centrifugal weight guide groove of the load side plate, 27 is an anti-load side plate, 27a is a centrifugal weight guide groove of the anti-load side plate, 28 is a central rotation holding member, and 28a is an inclined groove of the central rotation holding member. , 29 is a load-side rotation holding member, 29a is a slope groove of the load-side rotation holding member, 30 is an anti-load-side rotation holding member, 30a is an anti-load-side rotation holding member, 31 Is a torsion spring, and 32 is an O-ring.
In the first embodiment and the second embodiment, a fixed rotor in which a rotor is fixed to a rotating shaft, and adjacent to the fixed rotor in the axial direction so as to be rotatable relative to the fixed rotor. In the third embodiment, at least two rotors that are mounted adjacent to each other in the axial direction of the rotating shaft are movable relative to each other. This is a point provided with a rotor (in this embodiment, there are three movable rotors). That is, each of the first rotating rotor core 21, the second rotating rotor core 22, and the third rotating rotor core 23 constitutes a movable rotor.
The load side plate 26 and the anti-load side plate 27 are press-fitted and fixed to the rotating shaft 24 of the rotor, and the three holding members 28, 29, and 30 that rotate relatively rotate relative to the rotating shaft of the rotor. The three holding members 28, 29, and 30 that rotate relative to each other regulate the position of relative rotation by the centrifugal weight 25. The ends of the centrifugal weight 25 are attached to the centrifugal weight guide grooves 26a and 27a of the load side plate 26 and the anti-load side plate 27, and transmit the torque of the rotor core to the rotating shaft.
FIG. 11 is an explanatory view of the shape of the guide groove and the centrifugal weight guide groove in which the centrifugal weight 25 is mounted. As shown in the figure, the centrifugal weight guide groove is different from the guide grooves 28a, 29a, 30a that convert the centrifugal force acting on the centrifugal weight provided on the three holding members that rotate relatively to the force in the rotational direction. 26a and 27a have a shape in which the centrifugal weight can move only in the radial direction. This embodiment is effective when it is desired that the magnetic pole of the rotor does not move in the rotation direction with respect to the relative rotation.

By using the present invention for an industrial electric motor, it becomes possible to drive with higher efficiency up to a higher rotation than the conventional one while maintaining the same size as the conventional one, thereby improving workability.
Further, by using the present invention as a wind power generator or a vehicular generator, a desired voltage can always be generated with high efficiency without depending on the rotation speed.

An axial sectional view of the rotating electrical machine showing the first embodiment of the present invention, An axial sectional view showing the inside of the holding member of the third rotor core of the present invention, It is a disassembled perspective view of the component of a rotor. It is a figure explaining the state of the rotor at the time of low rotation, Comprising: (a) is a perspective view of a rotor, (b) is a front view of (a), and showed the site | part of a guide groove and a centrifugal weight typically. thing It is a figure explaining the state of the rotor at the time of rotation rise, Comprising: (a) is a perspective view of a rotor, (b) is a front view of (a), and showed the site | part of a guide groove and a centrifugal weight typically. thing It is a figure explaining the state of the rotor at the time of high rotation, Comprising: (a) is a perspective view of a rotor, (b) is a front view of (a), and showed the site | part of the guide groove and the centrifugal weight typically. thing It is a synthetic magnetomotive force explanatory diagram with respect to the relative rotational electrical angle of the rotor core, (a) at low rotation, (b) at high rotation Graph showing the relationship of induced voltage to rotational speed Explanatory drawing of force that driving torque acts on centrifugal weight FIG. 2 is a rotor of a rotating electrical machine showing a second embodiment of the present invention, in which (a) is a perspective view thereof, and (b) is a front view of (a) schematically showing a portion of a guide groove and a centrifugal weight. thing Axial sectional view of a rotor of a rotating electrical machine showing a third embodiment of the present invention. Illustration of guide groove and centrifugal weight guide groove 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 First rotor core (load side)
2 Second rotor core (on the opposite side)
3 Third rotor core (turning side)
4 Rotating shaft 5 Centrifugal weight 6 Load side holding member 6a Load side holding member guide groove 6b Load side holding member collar 6c Holding member fitting portion 7 Anti-load side holding member 7a Anti-load side holding member guide groove 7b Collar portion 7c of anti-load-side holding member Fitting portion 8 of holding member Rotating-side holding member 8a Guide groove 8d of rotating-side holding member Torsion spring mounting hole 9 of rotating-side holding member Torsion spring 10 Rotation position detector 11 Load-side field magnet 12 Anti-load-side field magnet 13 Rotating-side field magnet 14 O-ring 15 Load-side bearing 16 Anti-load-side bearing 17 Stator magnetic pole 18 Winding 21 Load-side rotating rotor core 22 Anti-load-side rotating rotor core 23 Center-rotating rotor core 24 Rotating shaft 25 Centrifugal weight 26 Load-side plate 26a Centrifugal weight guide groove 27 of load-side plate Anti-load-side plate 27a Anti-load-side play Centrifugal weight guide groove 28 Center rotation holding member 28a Center rotation holding member guide groove 29 Load side rotation holding member 29a Load side rotation holding member guide groove 30 Anti-load side rotation holding member 30a Guide groove 31 of the rotation holding member on the non-load side Torsion spring 32 O-ring

Claims (5)

A fixed rotor fixed to the rotating shaft, and a movable rotor mounted adjacent to the fixed rotor in the axial direction so as to be rotatable relative to the fixed rotor,
In an embedded magnet type motor that is provided inside a rotor core that constitutes each of the rotors and that has a field magnet in a substantially V-shaped magnet insertion hole that is convex radially inward,
A plurality of holding members are fixed to the inner periphery of each of the rotor cores,
Inside the holding member, a plurality of guide grooves inclined in the circumferential direction, and inserted in the guide grooves, and moved in the guide grooves by receiving centrifugal force due to the rotation of the movable rotor. The centrifugal weight and one end are locked inside the guide groove provided in the holding member of the movable rotor, and the other end is locked in the groove provided in the rotating shaft and are opposite to the rotation direction. And a mechanism having a spring biasing in the direction,
The rotating electrical machine according to claim 1, wherein the number of the guide grooves and the centrifugal weights is the same as the number of magnetic poles of the rotor core. Comprising at least two movable rotors which are mounted adjacent to each other in the axial direction of the rotary shaft and which are rotatable relative to each other;
In an embedded magnet type motor that is provided inside a rotor core that constitutes each of the rotors and that has a field magnet in a substantially V-shaped magnet insertion hole that is convex radially inward,
A plurality of holding members are fixed to the inner periphery of each of the rotor cores,
Inside the holding member, a plurality of guide grooves inclined in the circumferential direction, and inserted in the guide grooves, and moved in the guide grooves by receiving centrifugal force due to the rotation of the movable rotor. The centrifugal weight and one end are locked inside the guide groove provided in the holding member of the movable rotor, and the other end is locked in the groove provided in the rotating shaft and are opposite to the rotation direction. And a mechanism having a spring biasing in the direction,
The rotating electrical machine according to claim 1, wherein the number of the guide grooves and the centrifugal weights is the same as the number of magnetic poles of the rotor core.   In the case where the rotating electrical machine is an electric motor, the circumferential direction of the guide groove provided on the holding member of the movable rotor is the circumferential direction of the guide groove provided on the holding member of the fixed rotor. 2. The rotating electrical machine according to claim 1, wherein the rotating direction of the movable rotor due to the centrifugal force is opposite to the rotating direction of the rotor of the electric motor.   In the case where the rotating electrical machine is a generator, the circumferential direction of the guide groove provided in the holding member of the movable rotor is the circumferential direction of the guide groove provided in the holding member of the fixed rotor. 2. The rotating electrical machine according to claim 1, wherein the rotating direction of the movable rotor due to the centrifugal force is the rotating direction of the rotor of the generator. The mounting portion where the centrifugal weight and the spring in the guide groove constituting the mechanism are arranged is filled with grease,
A fitting portion is provided in an adjacent portion of the holding member provided in the fixed rotor with respect to the holding member of the movable rotor, and a sealing member for preventing leakage of the grease is provided in the fitting portion. The rotating electrical machine according to claim 1 or 2.

Images