JP2008022637A - Rotary electric machine, and electric motor or dynamoelectric machine using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust the output characteristics of an electric motor by changing a confronted area of a rotor 5 and a stator 14. <P>SOLUTION: The rotor 5 having a magnet 4a is arranged on an outer periphery and the stator 14, to which a coil is wound is arranged on the inner periphery. The stator 14 is disposed in a movable object 17, whose rotation is restricted in the axial circumferential direction and which can freely move in the axis center direction. As a result of this, the movable object 17 is moved in the axis center direction, based on driving of the driving motor 7, and thus the facing area of the rotor 5 and the stator 14 is adjusted, and the characteristics of the motor can be adjusted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to the technical field of a rotating electrical machine whose output characteristics can be freely adjusted and an electric motor or a generator using the rotating electrical machine.

In general, when a rotating electrical machine is used as an electric motor, the output of the electric motor can be adjusted by changing the facing area between the stator and the rotor, where the rotor can be moved in the axial direction. Known (for example, Patent Documents 1 and 2). However, in this case, the output characteristics change in conjunction with the rotational speed (rotational speed) of the rotor, and there is a problem that it is impossible to control the output characteristics to be arbitrary.
On the other hand, there is known a technique in which output characteristics are adjusted by adjusting a gap (gap) between a rotor and a stator (Patent Document 3).
JP-A-5-300712 JP-A-6-141401 JP 2004-135486 A

  However, when the gap is adjusted, the output is sensitively influenced by the gap interval (distance), so that there is a problem that it is difficult to control because the gap adjustment with high accuracy is required. Moreover, since the attraction force between the stator and the rotor is large, there is a problem in that a large force is required to adjust the gap, and there are problems to be solved by the present invention.

The present invention has been created in view of the above-described circumstances and has been created for the purpose of solving these problems. The invention of claim 1 is directed to a rotor and a stator that are opposed to each other with a gap in the radial direction. In the rotating electrical machine comprising the above, the rotating electrical machine is provided with stator moving means for adjusting the axial movement of the stator relative to the rotor, so that the facing area between the stator and the rotor can be adjusted. The rotating electric machine is characterized.
The invention according to claim 2 is the rotating electrical machine according to claim 1, wherein the facing area adjustment range includes a state in which the facing area is zero.
According to a third aspect of the present invention, the stator moving means includes a drive source, a transmission shaft that is disposed at a predetermined outer diameter position from the axis of the rotor, and rotates in conjunction with the drive of the drive source, and a stator. A movable body that moves in the axial direction of the rotor in conjunction with the rotation of the transmission shaft, and a guide body that guides the movable body in the axial direction in a state in which the rotation around the axial core is restricted. The rotating electric machine according to claim 1 or 2, wherein the rotating electric machine is provided.
According to a fourth aspect of the present invention, the stator moving means is provided with a plurality of driven shafts in the circumferential direction at the outer diameter position from the rotor shaft core on which the transmission shaft is arranged. The transmission shaft and the driven shaft are: 4. The rotating electrical machine according to claim 3, wherein the rotating electrical machine is interlocked and connected so as to rotate in conjunction with the rotation of the transmission shaft.
According to a fifth aspect of the present invention, the rotor is provided on the outer peripheral side of the stator, and the transmission shaft and the driven shaft of the stator moving means are provided on the inner peripheral side. The rotating electrical machine according to the item.
The invention according to claim 6 is the electric motor according to any one of claims 1 to 5, wherein the rotating electric machine is an electric motor, and wheels are attached to the rotor.
According to a seventh aspect of the present invention, in the generator according to any one of the first to fifth aspects, the rotating electrical machine is a generator, and a blade is attached to the rotor.

According to the first aspect of the present invention, the rotational speed-torque characteristic of the rotating electrical machine can be easily adjusted and controlled by moving the stator in the axial direction.
According to the invention of claim 2, the rotating electrical machine can reduce the friction to substantially zero while driving is stopped.
According to the invention of claim 3, the stator moving means can be easily formed.
According to the fourth aspect of the present invention, the stator can be moved smoothly and stably.
By setting it as invention of Claim 5, the rotary electric machine which can adjust a characteristic can be manufactured compactly.
According to the sixth aspect of the present invention, the output characteristics can be continuously adjusted, and the electric motor capable of continuously changing the speed can be obtained.
According to the invention of claim 7, continuous power generation characteristics can be adjusted, and power generation corresponding to fluid speed such as wind speed can be performed.

  Next, a first embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 1 denotes a housing (vehicle body), and a flange portion 2 a formed at the base end of a support shaft 2 is integrally fixed to the housing 1. A boss 3c of a rotating body 3 is rotatably supported on the support shaft 2 via bearings 3a and 3b, and a tip end edge of a cylindrical yoke 4 is integrally formed on the outer periphery of the rotating body 3. The plurality of magnets 4a are fixed to the inner peripheral surface of the yoke 4 in the circumferential direction, and thereby the rotor 5 is configured.

  A bracket 6 is integrally fixed to the flange portion 2 a on the side opposite to the side from which the support shaft 2 protrudes, and a drive motor 7 is attached to the bracket 6. A transmission shaft 8 is rotatably supported by a bearing 8a in a state of passing through the flange portion 2a and the bracket 6. The transmission shaft 8 is disposed at a predetermined outer diameter position from the shaft core of the support shaft 2. In addition, an intermediate gear 10a meshing with a drive gear 9 provided in the drive motor 7 and a transmission gear 10 are provided in a state of sandwiching the flange portion 2a, and the drive shaft 7 is driven by the drive motor 7 so that the transmission shaft 8 is connected to the intermediate gear 10a. Along with the gear 10, it rotates around the axis of the transmission shaft 8.

  Reference numeral 11 denotes a driven shaft that is arranged around the axis of the support shaft 2 so as to be located at the same distance as the outer diameter position of the transmission shaft 8 from the axis of the support shaft 2. In the embodiment, two are provided, and the transmission shaft 8 and the driven shaft 11 are arranged at an equal angle of 120 degrees. The driven shaft 11 is rotatably supported around the axis of the driven shaft 11 via a bearing 11a. A driven gear 12 is integrally fixed to the base end portion of each driven shaft 11. Yes. Reference numeral 13 denotes a ring gear whose outer peripheral surface has gear teeth 13a. The gear teeth 13a of the ring gear 13 are engaged with the transmission gear 10 and the driven gear 12, respectively. When the transmission gear 10 rotates in conjunction with the drive of the drive motor 7, the ring gear 13 rotates, and the driven gear 12 and the driven shaft 11 rotate in conjunction with this.

14 is a stator in which a coil 14b is wound around a core 14a. A plurality of the stators 14 are arranged in the circumferential direction with the outer peripheral surface facing the inner peripheral surface of the magnet 4a. 14, the inner peripheral surface side is supported by the support member 15.
On the other hand, the flange portion 2a has a spline groove (guide groove) 16a on the outer diameter side in a state of being located on the outer diameter side of the rotating boss portion 3c and on the inner diameter side of the transmission shaft 8 and the driven shaft 11. Is provided, and a projecting portion (guide portion) 17a formed on the movable body 17 is spline-fitted to the guide body 16 so that the movable body 17 is the axis of the support shaft 2. It is supported in a state in which it can move in the core direction and does not rotate in the direction around the axis (rotation restricted). The support member 15 is integrally connected to an extending portion 17b extending from the movable body 17 in the outer diameter direction.
Further, screw grooves (male screw grooves) 8b and 11b are formed in the distal end portions of the transmission shaft 8 and the driven shaft 11, and the screw grooves 8b and 11b are integrally formed with the extending portion 17b. An engraved screw hole 18 a is screwed into the provided operating body 18. Based on the rotation of the transmission shaft 8 and the driven shaft 11 accompanying the driving of the drive motor 7, the movable body 17 moves in the axial direction together with the stator 14, so that the opposing area between the stator 14 and the magnet 4a is increased. It has come to be adjusted. And in this Embodiment, the opposing area to be adjusted can be adjusted from the zero state (refer FIG. 2) which does not have an opposing surface to the state (refer FIG. 1) which opposes all. The present embodiment is an embodiment of a direct drive system in which wheels 19 are directly attached to the rotor 5 and a rotating electric machine is used as an electric motor.

  In the embodiment of the present invention configured as described above, the wheel 19 rotates together with the rotor 5 that rotates as the current flows through the coil 14b. By performing movement control in the direction, adjustment control can be performed by controlling the size of the opposing area of the rotor 5 and the stator 14. In other words, when the facing area is increased, the motor has low rotation and high torque characteristics, and as a result, it can cope with a case where a large output is required, such as when the vehicle starts, climbs a hill, or accelerates. Thus, the speed is increased, and when a large motor torque is not required, such as when traveling on a flat road at a constant speed, the facing area between the rotor 5 and the stator 14 can be reduced to achieve high speed traveling. Furthermore, when the vehicle is accelerated by its own weight when going down a slope, the rotational speed of the wheel 19 is increased and the rotational speed of the rotor 5 is increased to exceed the unloaded rotational speed on the motor side. Then, the electric motor generates a rotational load by starting regenerative power generation. In such a case, the facing area between the rotor 5 and the stator 14 may be reduced so as not to cause running resistance, and finally the facing area is reduced to zero and free rotation is achieved. In this way, it is possible to realize traveling with continuously variable speed.

  In addition, in this configuration, the movement of the stator 14 in the axial direction is performed by supporting the movable body 15 so as to be movable in the axial direction in a state where the rotation of the movable body 15 is restricted with respect to the support shaft 2 and driving the transmission shaft 8. The structure of the moving means can be simple and compact. In addition, in this case, the plurality of driven shafts 11 are arranged in the circumferential direction at the same diameter position as the transmission shaft 8 and rotate in conjunction with the transmission shaft 8 to move the stator 14 in the axial direction. Sometimes the stator 14 is not misaligned, and smooth and stable movement in the axial direction is possible. In addition, since the stator moving means is disposed on the inner diameter side of the stator 14, compactness can be achieved.

  In addition, this invention is not limited to the said embodiment, A rotary electric machine can be used as a generator like FIG. That is, this is the one in which the rotor 5 is provided with the wing body 20. In this case, for example, when this is a wind power generator, when the wind power is small and difficult to rotate, or when the rotor starts to rotate, the rotor 5 and the stator 14 can be controlled such that the facing area between the stator 14 and the stator 14 is reduced to zero or smaller, and the power generation characteristics are increased by increasing the facing area as the rotation is stabilized. By doing so, efficient power generation can be performed.

FIG. 5 is a cross-sectional side view showing a state where a rotating electric machine is used as an electric motor and a facing area between a rotor and a stator is large. FIG. 5 is a cross-sectional side view showing a state in which a rotating electric machine is used as an electric motor and a facing area between a rotor and a stator is zero. It is a front view of a rotary electric machine. FIG. 5 is a cross-sectional side view in which a rotating electrical machine is used as a power generator, and shows a state in which a facing area between a rotor and a stator is large and a state in which a rotor is in a small state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 5 Rotor 7 Drive motor 8 Drive shaft 11 Drive shaft 13 Ring gear 14 Stator 16 Guide body 17 Movable body 19 Wheel 20 Wing body

Claims (7)

  In a rotating electrical machine configured to include a rotor and a stator facing each other with a gap in the radial direction, the rotating electrical machine is provided with stator moving means for adjusting the movement of the stator in the axial direction relative to the rotor, A rotating electric machine characterized in that an opposing area between a stator and a rotor can be adjusted.   The rotating electric machine according to claim 1, wherein the facing area adjustment range includes a state in which the facing area is zero.   The stator moving means is provided at a predetermined outer diameter position from the drive source and the axis of the rotor, and is provided with a transmission shaft that rotates in conjunction with the drive of the drive source, and a stator, and is linked to the rotation of the transmission shaft. And a movable body that moves in the axial direction of the rotor, and a guide body that guides the movable body in the axial direction in a state in which the rotation around the axial core is restricted. The rotating electrical machine according to claim 1 or 2.   The stator moving means is provided with a plurality of driven shafts in the circumferential direction at the outer diameter position from the rotor shaft center where the transmission shaft is arranged. The transmission shaft and the driven shaft are interlocked with the rotation of the transmission shaft. The rotating electrical machine according to claim 3, wherein the rotating electrical machine is interlocked so as to rotate.   The rotating electrical machine according to any one of claims 1 to 4, wherein a rotor is provided on the outer peripheral side of the stator, and a transmission shaft and a driven shaft of the stator moving means are provided on the inner peripheral side.   The electric motor according to claim 1, wherein the rotating electric machine is an electric motor, and wheels are attached to the rotor.   The generator according to any one of claims 1 to 5, wherein the rotating electrical machine is a generator, and a rotor is attached to the rotor.

Images