JP6570983B2 - Rotating electric machine - Google Patents

Description

  Embodiments described herein relate generally to a rotating electrical machine.

  A rotating electrical machine is accompanied by vibration that causes noise during operation. For this reason, various structures for suppressing vibration of the rotating electrical machine have been proposed.

  Here, in recent years, the development of a small and lightweight rotating electrical machine has been promoted while increasing the capacity. However, when the rotating electrical machine is formed thin with a reduction in size and weight, it may be difficult to reduce vibration and noise depending on, for example, assembly accuracy, mounting state, operating conditions, and the like.

JP 2014-107947 A

  The problem to be solved by the present invention is to provide a rotating electrical machine that can reduce vibration and noise regardless of assembly accuracy, mounting state, operating conditions, and the like.

  The rotating electrical machine of the embodiment includes a stator, a rotor, and a rigidity control unit. The stator has an annular yoke portion and a plurality of teeth-like yoke portions. The teeth-like yoke portion protrudes from the annular yoke portion to the inner side in the radial direction of the annular yoke portion, and the stator coil is wound thereon. The rotor is disposed radially inside with respect to the stator. The rigidity control unit is disposed outside in the radial direction with respect to the stator. The rigidity control unit has a jacket and a magnetic field application unit. The jacket surrounds the annular yoke portion from the outside in the radial direction and is filled with a magnetorheological fluid. The jacket is made of a nonmagnetic material. The magnetic field application unit is disposed on the outer side in the radial direction with respect to the jacket and at least in a portion facing the toothed yoke portion, and applies a magnetic field in the radial direction to the magnetorheological fluid.

The top view which looked at the rotary electric machine in 1st Embodiment from the axial direction. The perspective view which shows the rotary electric machine of the state which removed the housing. The partial top view of the rotary electric machine shown in FIG. The enlarged plan view of the rotary electric machine which shows the other structure of 1st Embodiment. The top view of the rotary electric machine in 2nd Embodiment. The perspective view of the rotary electric machine in 3rd Embodiment of the state which removed the housing.

Hereinafter, a rotating electrical machine according to an embodiment will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a plan view of the rotating electrical machine 1 according to the first embodiment viewed from the axial direction.
As shown in FIG. 1, the rotating electrical machine 1 of the present embodiment is, for example, an inner rotor type switched reluctance motor (SR motor). The rotating electrical machine 1 includes a motor main body 11, a rigidity control unit 12, and a housing 13 that houses the motor main body 11 and the rigidity control unit 12. In the following description, the direction along the axis O of the stator 21 (annular yoke portion 33) in the motor body 11 is simply referred to as the axial direction, and the direction orthogonal to the axis O is referred to as the radial direction. The direction is called the circumferential direction.

The motor main body 11 includes a cylindrical stator 21 and a rotor 22 disposed on the inner side in the radial direction with respect to the stator 21.
The rotor 22 has a shaft 23 and a rotor core 24 fixed to the shaft 23.
The shaft 23 extends along the axial direction. Both ends in the axial direction of the shaft 23 are rotatably supported by bearings (not shown).

FIG. 2 is a perspective view showing the rotating electrical machine 1 with the housing 13 removed.
As shown in FIG. 2, the rotor core 24 is configured, for example, by laminating a plurality of magnetic steel plates in the axial direction. Specifically, the rotor core 24 includes a core main body 27 and a plurality of salient pole portions 28 that protrude from the outer peripheral surface of the core main body 27 in the radial direction.
A through-hole 29 that penetrates the core main body 27 in the axial direction is formed in the central portion of the core main body 27 in the radial direction. In the through hole 29, the above-described shaft 23 is fixed by press fitting or the like.

  Each salient pole portion 28 is arranged radially with respect to the axis O in a plan view viewed from the axial direction. In the illustrated example, the salient pole portions 28 are arranged at intervals (for example, every 90 °) in the circumferential direction. Each salient pole portion 28 extends in the radial direction. In plan view, the radially outer end surface of each salient pole portion 28 is formed as a curved surface that is convex outward in the radial direction.

As shown in FIG. 1, the stator 21 has a stator core 31 and a stator coil 32.
The stator core 31 is formed in a cylindrical shape by laminating a plurality of annular magnetic steel plates in the axial direction in a plan view, for example. Specifically, the stator core 31 includes an annular yoke portion 33 and a plurality of teeth-shaped yoke portions 34 that project radially inward from the inner peripheral surface of the annular yoke portion 33.
The annular yoke portion 33 surrounds the rotor 22 described above from the outside in the radial direction.

  Each toothed yoke portion 34 is arranged radially with respect to the axis O in a plan view. Each teeth-shaped yoke portion 34 includes a first teeth-shaped yoke portion 34A and a second teeth-shaped yoke portion 34B. The first teeth-shaped yoke portions 34A and the second teeth-shaped yoke portions 34B are alternately arranged in the circumferential direction. In the illustrated example, six tooth-shaped yoke portions 34 (three first tooth-shaped yoke portions 34A and three second tooth-shaped yoke portions 34B) are arranged at intervals in the circumferential direction (for example, every 60 °). Has been.

  Each toothed yoke portion 34 is formed in the same shape and size. Specifically, each tooth-shaped yoke portion 34 extends in the radial direction. In plan view, the radially inner end surface of each tooth-shaped yoke portion 34 is formed as a curved surface that is recessed toward the radially outer side. A gap is provided in the radial direction between the radially inner end face of the toothed yoke portion 34 and the radially outer end face of the salient pole portion 28 described above.

  The stator coil 32 is wound around each of the above-described toothed yoke portions 34 via an insulator (not shown). In the present embodiment, the stator coil 32 is wound around each of the teeth-shaped yoke portions 34 by salient pole concentrated winding. The stator coil 32 may be wound around each toothed yoke portion 34 by distributed winding.

The rigidity control unit 12 includes a jacket 41 and a magnetic field application unit 42.
The jacket 41 is formed in a cylindrical shape arranged coaxially with the axis O. The jacket 41 is made of a nonmagnetic material (for example, aluminum or a resin material). The jacket 41 is fitted on the stator core 31. Therefore, the jacket 41 surrounds the entire circumference of the stator core 31 from the outside in the radial direction. In the present embodiment, the axial length of the jacket 41 is equivalent to that of the stator core 31.

  A hollow portion 43 is formed in the jacket 41. The hollow portion 43 is defined by a wall portion (outer wall portion 41a and inner wall portion 41b) located on both sides in the radial direction of the jacket 41 and a wall portion (not shown) located on both sides in the axial direction. The hollow portion 43 is formed so as to surround the entire outer peripheral surface of the stator core 31 from the outside in the radial direction.

  The hollow portion 43 is filled with a magnetorheological fluid J. The magnetorheological fluid J is a fluid that increases the viscosity when a magnetic field is applied. In this embodiment, the magnetorheological fluid J is constituted by dispersing ferromagnetic particles covered with a surfactant in a base liquid such as water or oil.

The magnetic field application unit 42 includes a plurality of magnetic circuit parts 51, an iron core coil 52, and a nonmagnetic connection part (second connection part) 53.
Each magnetic circuit unit 51 is configured by laminating a plurality of arc-shaped magnetic steel plates in the axial direction in plan view. The respective magnetic circuit portions 51 are arranged at intervals in the circumferential direction on the outer side in the radial direction with respect to the jacket 41. The magnetic circuit units 51 have the same configuration. Therefore, in the following description, one magnetic circuit part 51 is demonstrated among each magnetic circuit part 51, and the description about the other magnetic circuit part 51 is abbreviate | omitted.

  The magnetic circuit unit 51 includes a region between the first tooth-shaped yoke portion 34A described above and the second tooth-shaped yoke portion 34B adjacent to one side in the circumferential direction with respect to the first teeth-shaped yoke portion 34A (hereinafter referred to as “the first tooth-shaped yoke portion 34A”). , Referred to as a magnetic field application region G1) in the radial direction. Therefore, in this embodiment, the three magnetic circuit parts 51 are arrange | positioned at intervals in the circumferential direction. In addition, as long as the magnetic circuit part 51 is arrange | positioned in the radial direction outer side at least with respect to the teeth-shaped yoke part 34, a shape, a number, etc. can be changed suitably.

The magnetic circuit unit 51 includes a first extending portion 55A, a second extending portion 55B, and a magnetic connecting portion (first connecting portion) 56 that connects the first extending portion 55A and the second extending portion 55B. ,have.
The first extending portion 55A is opposed to the corresponding first teeth-shaped yoke portion 34A in the radial direction with the jacket 41 interposed therebetween. The first extending portion 55A extends in the radial direction. Therefore, the first extending portion 55A and the first teeth-like yoke portion 34A are arranged linearly along the radial direction. The radially inner end surface of the first extending portion 55A is in contact with the outer peripheral surface of the jacket 41 from the radially outer side.

  The second extending portion 55B is opposed to the corresponding second tooth-shaped yoke portion 34B in the radial direction with the jacket 41 interposed therebetween. The second extending portion 55B extends in the radial direction. Therefore, the 2nd extension part 55B and the 2nd teeth-like yoke part 34B are arrange | positioned linearly along the radial direction. The radially inner end surface of the second extending portion 55B is in contact with the outer peripheral surface of the jacket 41 from the radially outer side. The extending portions 55 </ b> A and 55 </ b> B may be separated from the jacket 41 in the radial direction.

The magnetic connection portion 56 is formed in an arc shape in plan view. The magnetic connection part 56 connects the outer ends in the radial direction of the first extension part 55A and the second extension part 55B. In the present embodiment, the magnetic connection portion 56 is located on one side in the circumferential direction with respect to the first extending portion 55A and the first extending portion 55A among the pair of extending portions 55A and 55B adjacent in the circumferential direction. The adjacent second extending portion 55B is connected.
The iron core coil 52 is wound around each of the extending portions 55A and 55B. The iron core coil 52 is supplied with current by a system different from that of the stator coil 32 described above.

  The nonmagnetic connecting portion 53 connects the magnetic circuit portions 51 adjacent to each other in the circumferential direction on the outer side in the radial direction with respect to the jacket 41. Specifically, the nonmagnetic connection portion 53 is opposed to a region between the magnetic field application regions G1 adjacent in the circumferential direction (hereinafter referred to as a non-application region G2) in the radial direction. In the present embodiment, the non-application region G2 includes the first teeth-shaped yoke portion 34A and the second teeth-shaped yoke portion 34B located on the other side in the circumferential direction with respect to the first teeth-shaped yoke portion 34A. It is an area between. Therefore, the magnetic circuit unit 51 and the nonmagnetic connection unit 53 are formed in a cylindrical shape as a whole.

  The nonmagnetic connection portion 53 is formed in an arc shape in plan view. It should be noted that the shape and dimensions of the nonmagnetic connection portion 53 can be changed as appropriate. In this case, the nonmagnetic connecting portion 53 may be in contact with the jacket 41 from the outside in the radial direction.

  The housing 13 is formed in a cylindrical shape arranged coaxially with the axis O. The housing 13 surrounds the motor main body 11 and the rigidity control unit 12 from the outside in the radial direction. The housing 13 is externally fitted to the magnetic circuit part 51 and the nonmagnetic connection part 53 of the rigidity control part 12 by shrink fitting or the like.

Next, the effect | action of the rotary electric machine 1 mentioned above is demonstrated.
In the rotating electrical machine 1, when a current is supplied to the stator coil 32, each toothed yoke portion 34 is excited. Then, the salient pole portion 28 of the rotor 22 is attracted by the magnetic attraction force generated in each tooth-shaped yoke portion 34, so that a rotational force is generated in the rotor 22. Then, by shifting the timing of current supply to the stator coil 32 of each tooth-shaped yoke portion 34 at a predetermined timing, the rotor 22 rotates in a predetermined rotation direction and at a predetermined rotation speed.

  When the rotating electrical machine 1 rotates, an electromagnetic excitation force is applied to the stator 21 from the rotor 22. The stator 21 tends to deform in the radial direction by an electromagnetic excitation force acting from the rotor 22. By repeating this deformation in accordance with the rotation of the rotor 22, the rotating electrical machine 1 is vibrated. Further, when the stator 21 is deformed in the radial direction, the air around the stator 21 is pushed out in the radial direction and released as sound pressure. This sound pressure is transmitted to the surroundings as noise of the rotating electrical machine 1.

  The vibration and noise described above are particularly large in the resonance state of the stator 21 where the frequency of the electromagnetic excitation force by the rotor 22 matches the natural frequency of the stator 21. Further, the vibration mode (deformation mode) of the stator 21 is a mode in which the stator 21 is deformed into an ellipse (ellipse mode (N = 2)), or the entire stator 21 expands or contracts in the radial direction in the same phase. Mode (expansion / contraction mode (N = 0)). Among the vibration modes, for example, the elliptical mode is a mode that is a main component of vibration and noise, and thus the amount of deformation of the stator 21 increases. Note that the vibration mode changes according to the rotational speed of the rotor 22 and the like.

  Here, in the magnetic field application unit 42 of the present embodiment, the magnetic circuit unit 51 corresponding to the portion of the stator 21 where the electromagnetic excitation force acts greatly is excited in accordance with the rotation speed (vibration mode) of the motor body 11. . That is, when a current is supplied to the iron core coil 52 wound around the first extending portion 55A and the second extending portion 55B, the magnetic circuit portion 51 is excited. As a result, a magnetic field is applied to the magnetorheological fluid J in the hollow portion 43.

FIG. 3 is a partial plan view of the rotating electrical machine 1.
As shown in FIG. 3, the magnetic field lines B of the magnetic field applied by the magnetic field applying unit 42 pass through the magnetorheological fluid J and the magnetic connection portion 56 in the hollow portion 43, and the first extending portion 55 </ b> A and the second extending portion. It becomes a closed loop connecting 55B. Specifically, the lines of magnetic force B extend, for example, from the first extending portion 55 </ b> A inward in the radial direction, pass through the outer wall portion 41 a of the jacket 41, and enter the hollow portion 43. The lines of magnetic force B that have entered the hollow portion 43 extend radially inside the hollow portion 43 and then extend circumferentially within the hollow portion 43. Thereafter, the magnetic field lines B again pass through the outer wall portion 41a of the jacket 41 and enter the second extending portion 55B. The lines of magnetic force B incident on the second extending portion 55B extend in the circumferential direction in the magnetic connecting portion 56 and enter the first extending portion 55A.

  Here, since the jacket 41 is made of a nonmagnetic material, the magnetic lines of force B that have entered the hollow portion 43 positively pass through the magnetorheological fluid J. That is, the magnetic flux can be prevented from leaking to the outside through the inner wall portion 41 b of the jacket 41, and the magnetic flux can be concentrated in the magnetorheological fluid J (in the hollow portion 43). Thereby, a magnetic field can be effectively applied to the magnetorheological fluid J.

  When a magnetic field is applied to the magnetorheological fluid J, the direction of the ferromagnetic particles in the magnetorheological fluid J is aligned with the direction in which the magnetic lines of force B extend, so that the rigidity (viscosity) of the magnetorheological fluid J increases. In particular, a magnetic field in the radial direction is applied to the magnetorheological fluid J positioned between the radially extending portions 55A and 55B and the toothed yoke portions 34A and 34B in the magnetorheological fluid J. Then, since the directions of the ferromagnetic particles contained in the magnetic viscous fluid J are aligned in the radial direction, the radial rigidity of the magnetic viscous fluid J (jacket 41) increases. As a result, the jacket 41 can suppress the stator 21 from being deformed outward in the radial direction by the electromagnetic excitation force acting on the stator 21.

  In the present embodiment, the current supply timing to the iron core coil 52 of each of the extending portions 55 </ b> A and 55 </ b> B is shifted at a predetermined timing according to the rotational speed of the rotor 22. For example, among each tooth-shaped yoke portion 34, the magnetic circuit portion 51 corresponding to the tooth-shaped yoke portion 34 being excited (located outside in the radial direction) is excited. Thereby, the radial rigidity of the magnetorheological fluid J corresponding to the portion of the stator 21 where the electromagnetic excitation force acts greatly can be increased.

Thus, in this embodiment, the radial rigidity of the magnetorheological fluid J can be increased by applying the radial magnetic field to the magnetorheological fluid J by the magnetic field application unit 42. Thereby, the magnetic viscous fluid J (jacket 41) can suppress the stator 21 from being deformed outward in the radial direction by the electromagnetic excitation force acting on the stator 21. As a result, vibration and noise of the rotating electrical machine 1 can be reduced.
In particular, in the present embodiment, by controlling the magnetic field by the magnetic field application unit 42, the rigidity of the magnetorheological fluid J can be partially changed to a desired portion at a desired timing. Thereby, compared with the case where the outer side of the stator 21 is enclosed with a highly rigid housing etc., size reduction and weight reduction of radial direction can be achieved. Moreover, the vibration and noise of the rotating electrical machine 1 can be reduced regardless of the assembly accuracy, the mounting state, the operating conditions, and the like.

In the present embodiment, the extending portions 55A and 55B of the magnetic field applying unit 42 and the teeth-shaped yoke portions 34 of the stator 21 are configured to overlap in the radial direction.
According to this configuration, it is possible to increase the radial rigidity of the magnetorheological fluid J around the teeth-like yoke portion 34 where the electromagnetic excitation force acts greatly in the stator 21. Thereby, the further reduction of the vibration and noise of the rotary electric machine 1 can be aimed at.

Furthermore, in this embodiment, the extending portions 55A and 55B of the magnetic field application unit 42 are in contact with the jacket 41 from the outside in the radial direction.
According to this configuration, since the jacket 41 can be supported from the outside in the radial direction by the magnetic field application unit 42, the deformation of the stator 21 and the jacket 41 in the outside in the radial direction can be reliably suppressed.

In this embodiment, it was set as the structure which has the nonmagnetic connection part 53 which connects the magnetic circuit parts 51 adjacent in the circumferential direction.
According to this structure, it can suppress that the magnetic flux which generate | occur | produced in the magnetic circuit part 51 leaks outside. Thereby, magnetic flux can be concentrated on the magnetorheological fluid J, and the rigidity of the magnetorheological fluid J can be effectively improved.
Further, by connecting the magnetic connection portions 56 adjacent in the circumferential direction by the nonmagnetic connection portion 53, deformation and displacement of the magnetic circuit portion 51 can be regulated by the nonmagnetic connection portion 53. Thereby, the vibration and noise of the rotary electric machine 1 can be effectively suppressed over a long period of time.

In the present embodiment, the configuration is such that the strength of the magnetic field applied from the magnetic field application unit 42 is controlled in accordance with the rotational speed of the rotor 22.
According to this configuration, the stiffness of the magnetorheological fluid J can be changed at a desired timing to a desired portion with respect to different vibration modes generated in each rotation speed range. Thereby, vibration and noise can be reliably reduced, and a high-performance rotating electrical machine 1 can be provided.

In the above-described embodiment, the SR motor has been described as an example. However, the present invention is not limited to this, and the configuration of the present embodiment can be applied to various rotating electric machines such as a permanent magnet synchronous type.
Moreover, although the case where the rotary electric machine 1 was used as a motor was demonstrated in embodiment mentioned above, even if it is a case where it uses as a generator not only in this, the structure of this embodiment is applicable.

In the embodiment described above, the configuration in which the magnetic circuit portions 51 are connected to each other by the nonmagnetic connection portion 53 has been described. However, a configuration without the nonmagnetic connection portion 53 may be used. For example, the magnetic circuit unit 51 may be arranged on the inner peripheral surface of the housing 13 with a gap in the circumferential direction.
The magnetic field application unit 42 can be applied in various shapes as long as it can apply a radial magnetic field to a portion of the magnetorheological fluid J that is located radially outside the toothed yoke portion 34. . In this case, if the extending portions 55A and 55B are disposed at least in a portion overlapping the teeth-shaped yoke portion 34 in the radial direction, the extending portion is positioned in a portion located between the adjacent tooth-shaped yoke portions 34 in the circumferential direction. It is also possible to use a configuration in which

FIG. 4 is an enlarged plan view of the rotating electrical machine 1 showing another configuration of the first embodiment.
As in the rotating electrical machine 1 illustrated in FIG. 4, the permanent magnet 70 may be disposed in the magnetic circuit unit 51. Specifically, the magnetic connection portion 56 of the magnetic circuit portion 51 is formed with a recess 71 that is recessed outward in the radial direction. In the recess 71, the permanent magnet 70 is accommodated so as to have a different polarity in the circumferential direction. That is, the permanent magnet 70 is polarized in the direction of the magnetic field generated by the iron core coil 52.

  According to this configuration, it is possible to always apply a bias magnetic field to the magnetic circuit unit 51 and the magnetorheological fluid J by disposing the permanent magnet 70 in the magnetic connection unit 56. Thereby, since the rigidity of the magnetorheological fluid J can be secured in advance, vibration and noise of the rotating electrical machine 1 can be further reduced.

(Second Embodiment)
FIG. 5 is a plan view of the rotating electrical machine 100 according to the second embodiment. In the present embodiment, in the jacket 101, the first partition plate 102 described above in that the partition plate 102 that partitions the magnetic field application region (opposing region) G1 and the non-application region (non-opposing region) G2 in the circumferential direction is provided. This is different from the embodiment. In the following description, the same components as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  In the rotating electrical machine 100 shown in FIG. 5, the partition plates 102 are respectively disposed at the boundary portions between the magnetic field application region G1 and the non-application region G2 in the circumferential direction. In the present embodiment, the partition plate 102 is disposed in a portion of the jacket 101 located on both sides in the circumferential direction with respect to the magnetic circuit unit 51.

  The partition plate 102 extends in the radial direction and the axial direction in the jacket 101. The partition plate 102 is formed integrally with the jacket 41, for example. That is, both ends in the radial direction of the outer peripheral edge of the partition plate 102 are connected to the outer wall 41a and the inner wall 41b of the jacket 41, respectively. On the other hand, both end edges in the axial direction of the outer peripheral edge of the partition plate 102 are connected to wall portions (not shown) located on both sides of the jacket 41 in the axial direction. Therefore, in the jacket 101, the magnetic field application region G1 and the non-application region G2 are partitioned in the circumferential direction by the partition plate 102.

  In the jacket 101, the space on the magnetic field application region G1 side with respect to the partition plate 102 is filled with the magnetorheological fluid J. On the other hand, in the jacket 101, the space on the non-application area G2 side with respect to the partition plate 102 is, for example, an air layer. That is, the space on the non-application area G2 side with respect to the partition plate 102 is not filled with the magnetorheological fluid J. Note that a nonmagnetic material or the like may be disposed in a space on the non-application region G2 side with respect to the partition plate 102. Moreover, if the partition plate 102 is the structure which partitions off between the magnetic field application area | regions G1 adjacent in the circumferential direction, it will be formed over the whole region (non-application area | region G2 whole area) between the magnetic field application areas G1 adjacent in the circumferential direction. It doesn't matter.

  According to this configuration, leakage of magnetic flux to the non-application region G2 can be suppressed when a magnetic field is applied by the magnetic field application unit 42. Thereby, a magnetic flux can be concentrated on the magnetorheological fluid J in the magnetic field application region G1, and the rigidity of the magnetorheological fluid J can be effectively improved.

(Third embodiment)
FIG. 6 is a perspective view of the rotating electrical machine 200 in the third embodiment with the housing 13 removed. This embodiment is different from the above-described embodiment in that a plurality of annular rigidity control units 201 are arranged at intervals in the axial direction. In the following description, the same components as those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the rotating electrical machine 200 shown in FIG. 6, each rigidity control unit 201 is shorter in the axial direction than the motor body 11. Each of the rigidity control units 201 is disposed on the outer side in the radial direction with respect to the jacket 41 with an interval in the axial direction. That is, each rigidity control unit 201 surrounds the jacket 41 from the outside in the radial direction at a different position in the axial direction. In addition, the other structure of each rigidity control part 201 is the same structure as the rigidity control part 12 in 1st Embodiment.

According to this configuration, the rigidity control unit 201 can be selectively disposed at an arbitrary position in the axial direction with respect to the stator 21. Therefore, it is possible to effectively support an arbitrary position in the axial direction of the stator 21 (for example, a portion of the stator 21 where an electromagnetic excitation force is easily applied) from the outside in the radial direction.
Further, by arranging the rigidity control unit 201 at intervals in the axial direction, the rigidity control unit 201 can be reduced in size as compared with the configuration in which the entire axial length of the motor body 11 is covered by the rigidity control unit 201. . As a result, the cost of each stiffness control unit 201 is reduced and the manufacture of each stiffness control unit 201 is facilitated. In addition, the timing which applies a magnetic field to the magnetic circuit part 51 of each rigidity control part 201 can be changed suitably.

  In the third embodiment described above, the case where three rigidity control units 201 are arranged in the axial direction has been described. However, the present invention is not limited to this, and two or more pluralities may be used.

According to at least one embodiment described above, the radial rigidity of the magnetorheological fluid can be increased by applying the radial magnetic field to the magnetorheological fluid by the magnetic field application unit. Thus, the magnetic viscous fluid (jacket) can suppress the stator from deforming outward in the radial direction due to the electromagnetic excitation force acting on the stator. As a result, vibration and noise of the rotating electrical machine can be reduced.
In particular, by controlling the magnetic field by the magnetic field application unit, the rigidity of the magnetorheological fluid can be partially changed to a desired portion at a desired timing. Thereby, compared with the case where the outer side of a stator is enclosed with a highly rigid housing etc., size reduction and weight reduction of radial direction can be achieved. Moreover, the vibration and noise of the rotating electrical machine can be reduced regardless of the assembly accuracy, the mounting state, the operating conditions, and the like.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine, 12 ... Stiffness control part, 21 ... Stator, 22 ... Rotor, 33 ... Annular yoke part, 34 ... Teeth-like yoke part, 41 ... Jacket, 42 ... Magnetic field application unit, 43 ... Hollow part, 52 ... Iron core Coil, 53... Non-magnetic connection part (second connection part), 55 A... First extension part, 55 B... Second extension part, 56 ... Magnetic connection part (first connection part), 70. Rotating electric machine, 101 ... jacket, 102 ... partition plate, 200 ... rotating electric machine, 201 ... rigidity control section

Claims (8)

A stator having a plurality of teeth-like yoke portions around which a stator coil is wound, and the annular yoke portion and the annular yoke portion projecting radially inward from the annular yoke portion;
A rotor disposed inside the radial direction with respect to the stator;
A rigidity control unit disposed outside the radial direction with respect to the stator,
The rigidity control unit is
A jacket made of a non-magnetic material surrounding the annular yoke portion from the outside in the radial direction and filled with a magnetorheological fluid;
A magnetic field application unit that is disposed on the outer side in the radial direction with respect to the jacket, at least in a portion facing the teeth-like yoke portion, and applies the magnetic field in the radial direction to the magnetorheological fluid. ,
Rotating electric machine. In the rotating electrical machine according to claim 1,
The magnetic field application unit includes:
A plurality of extending portions respectively extending in the radial direction at portions facing the plurality of teeth-like yoke portions in the radial direction;
An iron core coil wound around each of the plurality of extending portions; and a first connecting portion that connects a pair of the extending portions adjacent in the circumferential direction of the annular yoke portion among the plurality of extending portions; have,
Rotating electric machine. The rotating electrical machine according to claim 2,
The extending portion is in contact with the jacket from the outside in the radial direction,
Rotating electric machine. In the rotating electrical machine according to claim 2 or claim 3,
The first connection portion is provided with a permanent magnet polarized in the direction of the magnetic field generated in the iron core coil.
Rotating electric machine. In the rotating electrical machine according to any one of claims 2 to 4,
The magnetic field application unit has a second connection portion made of a nonmagnetic material that connects the first connection portions adjacent in the circumferential direction.
Rotating electric machine. In the rotating electrical machine according to any one of claims 2 to 5,
The jacket, the extension portion, and the first connection portion are opposed to each other in the radial direction, and the jacket, the extension portion, and the first connection portion are opposed in the radial direction. A partition wall made of a non-magnetic material that partitions the inside of the jacket in the circumferential direction in the non-opposing region,
The inside of the jacket is filled with the magnetorheological fluid in a portion located in the facing region,
Rotating electric machine. In the rotating electrical machine according to any one of claims 1 to 6,
A plurality of the rigidity control units are arranged at intervals in the axial direction of the annular yoke part.
Rotating electric machine. The rotating electrical machine according to any one of claims 1 to 7,
The rigidity control unit controls the strength of the magnetic field applied from the magnetic field application unit according to the number of rotations of the rotor.
Rotating electric machine.

Images