JP2008079397A - Variable air gap rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a variable air gap rotary electric machine wherein even when the rotational speed suddenly changes, the air gap of the rotary electric machine can be quickly adjusted and its rotor can be reduced in weight. <P>SOLUTION: The rotor 2 is installed on the rotor shaft 1 of the rotary electric machine so that it can be relatively moved in the axial direction but not in the circumferential direction. Cam members 8, 10 that are expanded and contracted stepwise in the axial direction are attached to the rotor 2. The cam members 8, 10 are cylindrical members having multiple saw tooth-like protrusions 11, 12, different in height in the axial direction, disposed in the circumferential direction. The protrusions 11, 12 of the two cam members 8, 10 are engaged with each other in the axial direction, and one 8 of the cam members is coupled with the rotor 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a variable air gap type rotating electrical machine that can change a gap (air gap) between a rotor that is a rotor and a stator that is a stator.

A gap between the rotor and the stator is called an air gap, and becomes a magnetic resistance of a magnetic circuit formed between the rotor and the stator in order to drive the rotor. As an axial gap type rotating electrical machine capable of arbitrarily changing the air gap according to the operating state of the rotating electrical machine, such as when the rotor rotates at high speed, conventionally, for example, the one described in Patent Document 1 is known. Yes.
In the axial gap type rotating electrical machine described in Patent Document 1, a counter pendulum capable of swinging in the radial direction of the rotating electrical machine is attached to the rotor. As the rotational speed of the rotor increases, a larger centrifugal force acts on the counter pendulum, and the counter pendulum moves in the outer diameter direction. Using this centrifugal force, the rotor position is changed to change the distance of the air gap.
Japanese Patent Laid-Open No. 2002-325412

However, the conventional axial gap type rotating electrical machine has the following problems. That is, in a rotating electrical machine whose rotational speed changes suddenly like a power source of an electric vehicle, the counter pendulum cannot move in response to the rotational speed quickly. Therefore, the adjustment of the air gap distance cannot be performed accurately.
Furthermore, since the rotor must be moved with such a large force as to overcome the strong magnetic force between the rotor and the stator, the counter pendulum must be weighted. In such an axial gap type rotating electrical machine described in Patent Document 1, since the weight and moment of inertia of the rotor are large, it is a power source for an electric vehicle that is required to quickly change the rotational speed of the rotor. It becomes difficult to use.

  In view of the above circumstances, the present invention proposes a variable air gap rotating electrical machine that is light in weight and suitable as a power source for an electric vehicle.

For this purpose, the variable air gap type rotating electrical machine according to the present invention is as described in claim 1,
In the variable air gap type rotating electrical machine in which the air gap between the rotor and the stator changes,
The rotor is attached to the rotor shaft of the rotating electrical machine so as to be relatively movable in the axial direction and not relatively movable in the circumferential direction, and a cam mechanism that expands and contracts stepwise in the axial direction is attached to the rotor.
The cam mechanism includes two cylindrical members in which a plurality of serrated projections having different heights in the axial direction are arranged in the circumferential direction, and the projections of the two cylindrical members are engaged with each other in the axial direction. One of these is connected to a rotor.

  According to such a configuration of the present invention, the rotor position can be moved by relatively rotating the two cylindrical members constituting the cam mechanism with a small force, so that there is no need to attach a weighted counter pendulum to the rotor. The rotor is lighter. Therefore, it can be used as a power source for an electric vehicle that requires a sudden change in rotational speed such as sudden acceleration and sudden deceleration.

Hereinafter, embodiments of the present invention will be described in detail based on examples shown in the drawings.
FIG. 1 is a side view showing a state in which the variable air gap type rotating electrical machine according to the first embodiment of the present invention is viewed from a direction perpendicular to the rotation axis, and shows a state where the air gap interval is narrow (= Da). FIG. 2 is a side view showing a state (= Db) where the air gap interval is wide in the embodiment.

  In the first embodiment, two disk-shaped rotors 2 are provided on one rotor shaft 1 extending along the rotation axis. The rotor shaft 1 and the rotor 2 rotate in a direction indicated by an arrow in FIG. A stator 3 indicated by a broken line is disposed between the two rotors 1, and the rotor 2 and the stator 3 are opposed to each other in the direction of the rotation axis to form a rotary electric machine having an axial gap structure.

  An air gap 6 (gap) is formed between the facing surface 4 facing the stator 3 on the surface of the rotor 2 and the facing surface 5 of the stator 3 facing the facing surface 4. The opposing surface 4 and the opposing surface 5 are parallel, and the distance (air gap interval) is Da as shown in FIG. 1 when the rotational speed of the rotor 2 is in the 0 to medium speed range.

  A hole (not shown) is provided in the center of the rotor 2, and a hollow cylindrical cam member 8 is coupled to the opposite surface 4 side of the center of the rotor 2, and the rotor shaft 1 is passed through the rotor 2 and the cam member 8. In FIG. 1, the cam member 8 is made into a cross section with the dashed-dotted line XX, and the state seen from the direction of the arrow is shown in FIG. The rotor shaft 1 is coupled to the rotor 2 and the cam member 8 via a ball spline 9. That is, the rotor 2 is attached to the rotor shaft 1 via the ball spline 9 so as to be movable in the axial direction but not circumferentially.

  A hollow cylindrical cam member 10 is interposed between the cam members 8 and 8 respectively coupled to the two rotors 2. A plurality of serrated protrusions 12 having different heights in the rotational axis direction are disposed at both ends in the axial direction of the cam member 10 in the circumferential direction. A plurality of serrated protrusions 11 having different heights in the rotational axis direction are also arranged in the circumferential direction at the axial end of the cam member 8 on the side far from the rotor 2. Then, the both 11 and 12 are engaged with each other.

  FIG. 4 is a schematic diagram showing the meshed portion developed in the circumferential direction. FIG. 4A shows a case where the distance between the cam members 8 and 10 is short, and corresponds to FIG. FIG. 4B shows a state in which the distance between the cam members 8 and 10 is longer by one step than in the case of FIG.

The serrated projections 11 formed on the cam member 8 form two projections 11a having the lowest axial height at positions different by 180 degrees in the circumferential direction. The serrated projections 11 are sequentially raised in the circumferential direction. The protrusions at different positions by 180 degrees in the circumferential direction have the same height. The shape of the valley between the adjacent protrusions 11 and 11 is the same as that of the sawtooth protrusion 12.
The sawtooth protrusion 12 formed on the cam member 10 has the same configuration as the sawtooth protrusion 11.

  If the projection 11a having the lowest axial height and the projection 12b having the highest axial height are engaged with each other, in other words, the projection 11b having the highest axial height and the projection having the lowest axial height. When meshed with 12a, the distance between the cam members 8, 10 is the shortest as shown in FIG. When the cam members 8 and 10 are relatively rotated by one protrusion 11 (12), as shown in FIG. 4A, the distance between the cam members 8 and 10 increases by ΔD. Although not shown in the figure, when the cam members 8 and 10 are relatively rotated to engage the projection 11b having the highest axial height and the projection 12b having the highest axial height, The distance becomes the longest. Thus, the cam members 8 and 10 constitute a cam mechanism that expands and contracts stepwise in the axial direction.

As shown in FIGS. 1, 2, and 4, the sawtooth protrusion 11 (12) is formed by combining two oblique sides that are oblique to the axial direction and the circumferential direction. As a result, the cam members 8 and 10 can be relatively rotated in both the forward and reverse directions with a small torque. Further, as shown in FIGS. 1 and 2, the tips of the protrusions 11 (12) where the hypotenuses intersect may be formed flat or rounded so as to be formed smoothly. Accordingly, the cam members 8 and 10 can be relatively rotated with a smaller torque.
Thus, in the first embodiment, the cam members 8 and 10 can be relatively rotated to change the distance between the cam members 8 and 10 stepwise.

  FIG. 5 is a front view showing a state in which the cam member 10 and the stator 3 provided so as to surround the cam member 10 are viewed from the rotation axis direction. Although not shown in FIG. 5, the rotor shaft 1 is inserted into the hole 13 at the center of the cam member 10. The cam member 10 is rotatable relative to the rotor shaft 1. An annular disk rotor 14 is fixed to the outer periphery of the cam member 10 over the entire periphery. Then, a U-shaped caliper 15 is attached to the stator 3 side and disposed so as to straddle the disk rotor 14.

  As shown in FIG. 5, a plurality of stator cores 16 of the stator 3 are arranged in the circumferential direction on the outer diameter side of the disk rotor 14 and the caliper 15. Both ends in the axial direction of the stator core 16 constitute opposing surfaces 5. A coil 17 is wound in the middle of each stator core 16 in the axial direction. On the outer diameter side of the stator core 16 is provided a hollow cylindrical rotating electrical machine case 18 that forms an outer shell of the rotating electrical machine.

  Returning to FIG. 1, a disc spring 20 and a stopper 21 that prevents the disc spring 20 and the rotor 2 from slipping out of the rotor shaft 1 are sequentially arranged on the back surface 19 of the rotor 2 far from the stator 3. . The stopper 21 is fixed to the rotor shaft 1. The disc spring 20 presses the rotor 2 in a direction approaching the stator 3 and applies a compression axial force between the cam members 8 and 10.

The operation of the first embodiment will be described.
During rotation in the direction of the arrow in FIG. 1 in the speed range a where the rotational speed of the rotor 2 is low, the cam members 10 that mesh with the cam members 8 and 8 of the rotor 2 are also rotated together. Keeps the distance of the air gap 6 at Da. When the rotational speed of the rotor 2 increases and the rotational speed exceeds the speed range a, the caliper 15 pinches the disk rotor 14 and applies a braking torque to the cam member 10. At this time, since the cam member 8 rotates together with the rotor 2 without being braked, the rotational speed of the cam member 10 is slower than that of the cam member 8, and both the members 8 and 10 rotate relative to each other.

  Then, as described above with reference to FIGS. 4A and 4B, the distance between the cam members 8 and 10 is increased by ΔD, and the disc spring 20 is compressed and deformed so as to be decreased by ΔD in the axial direction. As a result, the interval of the air gap 6 changes from Da to Db. Db is longer than Da.

  Thus, while the rotation speed of the rotor 2 is rotating in the direction of the arrow in FIG. 2 in the speed range b higher than the speed range a, the cam members 10 that mesh with the cam members 8 and 8 of the rotor 2 are also brought together. The cam member 10 keeps the distance of the air gap 6 at Db.

  When the rotational speed of the rotor 2 further increases and the rotational speed exceeds the upper limit value of the speed range b, the caliper 15 pinches the disk rotor 14 and relatively rotates the cam members 8 and 10 as described above, and the air gap 6 Is changed from Db to Dc. Dc is longer than Db. Although not shown in the drawing, while the rotation speed of the rotor 2 is rotating in the speed range c higher than the speed range b, the cam members 10 meshing with the cam members 8 and 8 of the rotor 2 are also rotated together. Thus, the cam member 10 maintains the distance of the air gap 6 at Dc.

Thus, according to the variable air gap type rotating electrical machine according to the first embodiment, the two cam members 8 and 10 constituting the cam mechanism are relatively rotated with a small braking torque to move the axial position of the rotor 2. It is possible to make it. For this reason, a rotor can be reduced in weight rather than the conventional variable air gap type rotary electric machine. Further, the air gap distance can be adjusted more quickly than the conventional variable air gap type rotating electrical machine. Therefore, the variable air gap type rotating electrical machine according to the first embodiment can be used as a power source for an electric vehicle in which the rotational speed such as sudden acceleration and sudden deceleration changes suddenly.
Further, according to the variable air gap type rotating electrical machine according to the first embodiment, the cam members 8 and 10 can be rotated relative to each other in both the normal rotation direction and the reverse rotation direction. Can be adjusted to increase or decrease.

  Next, a second embodiment of the present invention will be described.

  FIG. 6 is a side view showing a state in which the variable air gap type rotating electrical machine according to the second embodiment is viewed from a direction perpendicular to the rotation axis, and shows a state where the air gap interval is narrow (= Da). FIG. 7 is a side view showing a state (= Db) where the air gap interval is wide in the embodiment. Since the basic configuration of the second embodiment is the same as that of the first embodiment described above, the same members are denoted by the same reference numerals, description thereof is omitted, and different configurations will be described.

  In the second embodiment shown in FIG. 6, the shape of the serrated projections of the cam members 8 and 10 is different from that of the first embodiment shown in FIG. That is, the sawtooth projection 11 (12) is formed by combining two longitudinal sides in the axial direction and two oblique sides obliquely intersecting the axial direction and the circumferential direction as shown in FIGS. Among the sawtooth projections 11 shown in FIG. 6, when the projection A located next to the projection A and having a higher axial height than the projection A is seen from the projection A having the lowest axial height, the projection A A vertical side extends from the tip of the ridge to form a valley, and a hypotenuse extends from this valley to the tip of the protrusion B. The projection C positioned next to the projection B and having an axial height higher than the projection B also has the same combination of the vertical side and the oblique side when the projection C is viewed from the projection B.

The operation of the second embodiment will be described.
The relative rotation of the cam member 8 on the upper side in FIG. 6 as viewed from the cam member 10 is in one direction so as to be in the direction of the arrow attached to the cam member 8, and cannot be rotated in the opposite direction. Therefore, the cam members 8 and 10 can be relatively rotated with a small torque in the direction in which the air gap interval is increased step by step from the narrow state. On the other hand, it is impossible to reduce the air gap interval one step at a time. The air gap interval is relatively rotated by one step from the maximum air gap interval to the minimum state.

  As described above, in the second embodiment, the cam members 8 and 10 can be relatively rotated in only one direction to increase the distance of the air gap 6 stepwise.

  Next, a third embodiment of the present invention will be described.

FIG. 8 is a side view showing a state in which the variable air gap type rotating electrical machine according to the third embodiment is viewed from a direction perpendicular to the rotation axis, and shows a state where the air gap interval is narrow (= Dh). FIG. 9 is a side view showing a state (= Di) where the air gap interval is wide in the embodiment. Comparing the third embodiment with the first embodiment, the cam mechanism comprising the cam members 8 and 10 is moved to the back surface 19 of the rotor 2, and the basic configuration of the third embodiment is the same as that described above. Common to one embodiment. For this reason, about the same member, a common code | symbol is attached | subjected and description is abbreviate | omitted.
The cam member 10 in the third embodiment is pivotally supported so as not to move in the axial direction and to be movable relative to the rotor shaft 1. The disc spring 23 presses the rotor 2 in a direction away from the stator 3 and applies a compression axial force between the cam members 8 and 10.

The operation of the third embodiment will be described.
In FIG. 8, during rotation of the rotor 2 at a low speed range h, the cam member 10 that meshes with the cam member 8 of the rotor 2 is also rotated together and is not braked by the caliper 15. The cam member 10 maintains the distance of the air gap 6 at Dh.
When the rotational speed of the rotor 2 increases and the rotational speed exceeds the speed range h, the caliper 15 pinches the disk rotor 14 and applies a braking torque to the cam member 10. At this time, since the cam member 8 rotates together with the rotor 2 without being braked, the rotational speed of the cam member 10 is slower than that of the cam member 8, and both the members 8 and 10 rotate relative to each other.

  Then, as described above with reference to FIGS. 4A and 4B, the distance between the cam members 8 and 10 is shortened by ΔD, and the cam member 8 and the rotor 2 are moved away from the stator 3 by ΔD in the axial direction. As a result, the interval of the air gap 6 changes from Dh to Di. Di is longer than Dh.

  Thus, while the rotation speed of the rotor 2 is rotating in the speed range i higher than the speed range h, the cam member 10 that meshes with the cam member 8 of the rotor 2 is also rotated together. The gap 6 is kept at Di.

  As is clear from the above description, according to the variable air gap type rotating electrical machine according to the third embodiment, the cam members 8 and 10 can be rotated with a small relative torque in both the forward and reverse directions. The space | interval of the air gap 6 can be adjusted so that it may increase or decrease in steps.

  Next, a fourth embodiment of the present invention will be described.

  FIG. 10 is a side view showing a state in which the variable air gap type rotating electrical machine according to the fourth embodiment is viewed from a direction perpendicular to the rotation axis, and shows a state where the air gap interval is wide (= Di). FIG. 11 is a side view showing a state (= Dh) in which the air gap interval is narrow in the embodiment. Since the basic configuration of the fourth embodiment is the same as that of the third embodiment described above, the same members will be denoted by the same reference numerals, the description thereof will be omitted, and different configurations will be described.

  In the fourth embodiment shown in FIG. 10, the shape of the serrated projections 11 (12) of the cam members 8 and 10 is the same as that of FIG. This is a combination of two oblique sides that obliquely cross the direction. Therefore, the relative rotation of the cam members 8 and 10 is one direction, and the relative rotation in the opposite direction is not possible.

The operation of the fourth embodiment will be described.
Since the relative rotation of the cam members 8 and 10 is limited to one direction, the axial distance between the cam members 8 and 10 can be increased for each step ΔD. That is, the interval of the air gap 6 can be narrowed for each step. On the other hand, it is impossible to increase the air gap interval by one step, and the air gap interval is rotated from the minimum state to the maximum state by one step relative rotation.

  In the rotational range i where the rotational speed of the rotor 2 is high, the air gap interval is widened as Di as shown in FIG. Further, in the rotation range h where the rotation speed of the rotor 2 is low, as shown in FIG. 11, the air gap interval is made narrower as Dh.

  As described above, in the fourth embodiment, the cam members 8 and 10 can be relatively rotated in only one direction to reduce the distance of the air gap 6 in a stepwise manner.

  Next, a fifth embodiment of the present invention will be described.

  FIG. 12 is a side view of the rotor according to the fifth embodiment. Since the basic configuration of the fifth embodiment is the same as that of the first embodiment described above with reference to FIGS. 5 and 6, the stator 3 described above along FIG. 5 can be applied to the rotor shown in FIG. 12 as it is. Of the rotor according to the fifth embodiment, the same members as those of the second embodiment will be denoted by the same reference numerals, description thereof will be omitted, and different configurations will be described.

  In this embodiment, as shown in FIG. 12, the cam member 10m is engaged with the cam member 8m on the upper side of FIG. 12, and the cam member 10n is engaged with the cam member 8n on the lower side of FIG. And these cam members 10m and 10n are made into another member, and it enables relative rotation between cam members 10m and 10n. Further, the arrangement direction of the serrated projections 12 of the cam member 10m and the arrangement direction of the serrated projections 12 of the cam member 10n are aligned in parallel. The cam members 10m and 10n are each provided with a braking device (not shown) composed of the disk rotor 14 and the caliper 15 described above. The rotor shaft 1m of the rotor 2m and the rotor shaft 1n of the rotor 2n are separate members.

  According to the variable air gap type rotating electrical machine according to the fifth embodiment, the air gap 6m of the rotor 2m and the air gap 6n of the rotor 2n can be individually adjusted.

  Next, a sixth embodiment of the present invention will be described.

  FIG. 13: is a longitudinal cross-sectional view which shows the state which cut | disconnected the variable air gap type rotary electric machine which becomes 6th Example by the plane containing a rotating shaft, and represents the state (= Dj) where an air gap space | interval is narrow. . FIG. 14 is a longitudinal sectional view showing a state (= Dk) in which the air gap interval is wide in the embodiment. In the sixth embodiment, both rotors do not move in the axial direction, but one rotor moves in the axial direction described above. In the sixth embodiment, the same members as those in the above-described embodiments will be denoted by the same reference numerals, description thereof will be omitted, and different configurations will be described as appropriate.

In FIG. 13, the rotor shaft 1 and the rotor 2 are movable in the axial direction, and are biased in a direction away from the stator 3 by the disc spring 20.
As viewed from the stator 3, a disk-shaped sub-rotor 22 having a hole 22 h at the center is disposed on the opposite side of the rotor 2. The sub-rotor 22 is attached to the rotating electrical machine case 18 so that it can rotate but cannot move in the axial direction. An annular cam member 10 having a hole 10 h at the center is coupled to the center of the sub-rotor 22. A serrated projection 12 is formed on the cam member 10. The serrated projections 11 formed at the one axial end 8 r of the cam member 8 are engaged with the serrated projections 12.
The hollow cylindrical cam member 8 extends in the axial direction from the above-described sub-rotor 22 to the rotor 2, and sequentially passes through the central hole 10 h of the cam member 10, the central hole 22 h of the sub-rotor 22, and the stator 3. To do. The other end of the cam member 8 on the side opposite to the axial one end 8 r is coupled to the rotor 2.

  The sawtooth protrusion 12 and the sawtooth protrusion 11 shown in FIG. 13 mesh with each other in the state of FIG. 4B described above, and the distance between the cam member 8 and the cam member 10 is long. Therefore, the rotor 2 compresses and deforms the disc spring 23 and is on the right side of FIG. 13, and the interval of the air gap 6 between the rotor 2 and the stator 3 becomes narrow as Dj.

  On the other hand, the sawtooth protrusion 12 and the sawtooth protrusion 11 shown in FIG. 14 mesh with each other in the state shown in FIG. In FIG. 14, the sawtooth protrusion 12 and the sawtooth protrusion 11 are shown to overlap each other. That is, the distance between the cam member 8 and the cam member 10 is short. Therefore, the disc spring 23 moves the rotor 2 to the left in FIG. 13, and the interval of the air gap 6 between the rotor 2 and the stator 3 becomes wider as Dk.

  The switching operation of the air gap 6 is performed by causing a relative current between the cam members 8 and 10 by flowing a composite current through the coil 17 and individually driving the rotor 2 and the sub-rotor 22. That is, a driving current for driving the rotor 2 and a driving AC for driving the sub-rotor 22 are superimposed to generate a composite current, and the composite current is passed through the coil 17 so that the cam members 8 and 10 are connected. Rotate relative. For the composite current, the technique described in Japanese Patent Application Laid-Open No. 11-275826 by the present applicant is used. The number of poles of the sub-rotor 22 and the rotor 2 is made different so that the sub-rotor 22 is driven with a driving AC different from that of the rotor 2. Specifically, the number of permanent magnets 24 arranged on the opposed surface 24 of the sub-rotor 22 is made different from the number of permanent magnets 7 arranged on the opposed surface 4 of the rotor 2.

By the way, according to each of the above-described embodiments, the rotor 2 is attached to the rotor shaft 1 of the rotating electrical machine so as to be relatively movable in the axial direction and not relatively movable in the circumferential direction, and the cam for changing the axial position of the rotor 2 stepwise. Members 8 and 10 are provided. The cam members 8 and 10 are hollow cylindrical members, and a plurality of sawtooth protrusions 11 and 12 having different axial heights are arranged in the circumferential direction at the axial ends of the cam members 8 and 10. The cam members 8 and 10 are coaxially butted so that the serrated protrusions 11 and 12 are engaged with each other so as to be relatively rotatable in the circumferential direction, and one of the two cam members 8 is connected to the rotor 2.
The position of the rotor 2 can be moved by relatively rotating the cam members 8 and 10 with a small force. Therefore, it is not necessary to attach a weighted counter pendulum to the rotor as in the conventional case, and the rotor 2 is reduced in weight. As a result, it can be used as a power source for electric vehicles that require rapid changes in rotational speed such as sudden acceleration and sudden deceleration.

  According to the first to fifth embodiments described above, the other cam member 10 is provided with the braking means comprising the disc rotor 14 and the caliper 15, so that the cam members 8, 10 can be rotated relative to each other. Become.

  According to the first and second embodiments described above, the rotors 2 and 2 are respectively attached to both ends of the rotor shaft 1, and the cam members 8 and 10 are disposed between the rotors 2 and 2. The distance between the air gaps 6 can be adjusted by expanding and contracting the axial distance.

According to the sixth embodiment described above, the auxiliary rotor 22 is attached to the other cam member 10, the auxiliary rotor 22 and the rotor 2 are disposed opposite to the common stator 3, the driving AC for driving the rotor 2, Since the composite current is generated by superimposing the driving alternating current for driving the rotor 22 and the composite current is passed through the coil 17 of the stator 3, the rotor 2 and the sub-rotor 22 are individually driven.
The cam members 8 and 10 can be rotated relative to each other in the forward direction and the reverse direction, and the distance between the air gaps 6 can be freely adjusted. Further, the gap of the air gap 6 can be adjusted regardless of the rotational speed of the rotor shaft 1 and the rotor 2.

  The above description is merely an example of the present invention, and the present invention can be variously modified without departing from the spirit of the present invention.

It is a side view which shows the state which looked at the variable air gap type rotary electric machine which becomes 1st Example of this invention from the direction orthogonal to a rotating shaft, and represents the state (= Da) where an air gap space | interval is narrow. It is a side view showing the state (= Db) where the air gap space | interval is wide in the Example. In the same Example, it is a longitudinal cross-sectional view which shows the state which the air gap changed. In FIG. 1, it is a cross-sectional view which shows the state which made the cam member the cross section by XX and was seen from the direction of the arrow. It is a schematic diagram which expand | deploys and shows the meshing location of the cam members in the Example in the circumferential direction, (a) shows the case where the distance of cam members is short, and respond | corresponds to FIG. (B) shows a state in which the distance between the cam members is increased by one step as compared with the case of (a), and corresponds to FIG. It is a front view which shows the state which looked at the cam member and the stator from the rotating shaft direction. It is a side view which shows the state which looked at the variable air gap type rotary electric machine which becomes 2nd Example of this invention from the direction orthogonal to a rotating shaft, and represents the state (= Da) where an air gap space | interval is narrow. It is a characteristic view which shows the relationship between the axial direction movement amount of a rotor core, and the axial direction force required for the said movement. It is a side view showing the state (= Db) where the air gap space | interval is wide in the Example. It is a side view which shows the state which looked at the variable air gap type rotary electric machine which becomes 3rd Example of this invention from the direction orthogonal to a rotating shaft, and represents the state (= Dh) where an air gap space | interval is narrow. It is a side view showing the state (= Di) where the air gap space | interval is wide in the Example. It is a side view which shows the state which looked at the variable air gap type rotary electric machine which becomes 4th Example of this invention from the direction orthogonal to a rotating shaft, and represents the state (= Di) where an air gap space | interval is wide. It is a side view showing the state (= Dh) where the air gap space | interval is narrow in the Example. It is a side view which shows the rotor which becomes 5th Example of this invention seeing from the direction orthogonal to an axial direction. It is a longitudinal cross-sectional view which shows the state which saw the variable air gap type rotary electric machine which becomes 6th Example of this invention cut | disconnected by the plane containing a rotating shaft, and represents the state (= Dj) with a narrow air gap space | interval. It is a longitudinal cross-sectional view showing the state (= Dk) where the air gap space | interval is wide in the Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor shaft 2 Rotor 3 Stator 4 Rotor facing surface 5 Stator facing surface 6 Air gap 7 Permanent magnet 8 Cam member 9 Ball spline 10 Cam member 11, 12 Serrated projection 14 Disc rotor 15 Caliper 16 Stator core 17 Coil 18 Rotating electrical machine case 19 Rotor back surface 22 Subrotor 24 Subrotor facing surface 25 Permanent magnet

Claims (4)

In a variable air gap type rotating electrical machine comprising a rotor moving means for changing the axial position of the rotor, wherein the air gap between the rotor and the stator changes,
The rotor moving means includes two cylindrical members, and a plurality of sawtooth protrusions having different heights in the axial direction are arranged at the axial ends of the cylindrical members, and the two cylindrical members are coaxially arranged. A variable air gap type rotating electrical machine characterized in that the saw-tooth projections are engaged with each other so as to be relatively rotatable in the circumferential direction, and one of these two cylindrical members is connected to the rotor. In the variable air gap type rotating electrical machine according to claim 1,
A variable air gap type rotating electrical machine characterized in that a braking means for braking rotation is provided on the other of the two cylindrical members. In the variable air gap type rotating electrical machine according to claim 1 or 2,
A variable air gap type rotating electrical machine, wherein the rotor is attached to both ends of a rotor shaft, and the rotor moving means is disposed between the rotors. In the variable air gap type rotating electrical machine according to claim 1,
A sub-rotor is attached to the other of the two cylindrical members, the sub-rotor and the rotor are disposed opposite to a common stator,
A driving current for driving the rotor and a driving AC for driving the sub-rotor are superimposed to generate a composite current, and the composite current is caused to flow through the coil of the stator. A variable air gap rotating electric machine that is individually driven.

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