JP2015195671A - rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary machine capable of more surely reducing an induction voltage during stop.SOLUTION: A rotary machine 10 includes: a rotor 1 which is rotated around a rotary shaft 11; a plurality of stators 2 disposed oppositely to the rotor 1 and including a movable stator 22; and a stator drive unit 3 capable of driving the movable stator 22 when stopping the rotary machine 10. The plurality of stators 2 are disposed in such a manner that numbers of slots are equal to each other and that positions in a circumferential direction of the rotor 1 are matched to each other during operation of the rotary machine 10. The stator drive unit 3 rotates the movable stator 22 at a predetermined angle in the circumferential direction of the rotor 1 in such a manner that a phase of an induction voltage generated in the movable stator 22 is deviated from a phase of an induction voltage generated in the other stator 21.

Description

  The present invention relates to a rotating machine.

  2. Description of the Related Art Conventionally, starter generators provided in automobiles, aircraft, and the like are widely known. The starter generator functions as an electric motor that supplies power to the engine when the engine is started. On the other hand, when the battery needs to be charged after the engine is started, the starter generator functions as a generator that generates electricity according to the rotation of the engine.

  As a rotating machine that can be used for a starter generator, for example, Patent Document 1 discloses a rotating machine that includes a stator that is rotatably supported in a case. In the rotating machine of Patent Document 1, when the rotor is rotating at a low speed or an intermediate speed, the stator is fixed so as not to rotate by fastening a brake provided in the case. Thereby, an induced voltage corresponding to the absolute rotational speed of the rotor is generated in the winding. On the other hand, when the rotor rotates at high speed, the brake is released and the stator rotates freely. Thereby, since the relative rotational speed of the rotor with respect to the stator becomes small, it is possible to prevent the induced voltage from increasing even when the absolute rotational speed of the rotor is large.

JP 2007-174757 A

  Incidentally, the rotating machine disclosed in Patent Document 1 releases the brake and freely rotates the stator even when an abnormality is detected in the rotating machine itself, the battery, or the electric system, etc., thereby suppressing the generation of the induced voltage. ing. However, with the configuration as in Patent Document 1, it is difficult to reliably reduce the induced voltage when the rotating machine is stopped.

  Then, this invention makes it a subject to provide the rotary machine which can reduce the induced voltage at the time of a stop more reliably.

  The rotating machine according to the present invention is for solving the above-described problem, and includes a rotor that rotates about a rotation axis, a plurality of stators that are arranged to face the rotor, and that include at least one movable stator, A stator driving unit capable of driving at least one movable stator when the machine stops. The plurality of stators have the same number of slots, and are arranged such that the positions in the circumferential direction of the rotor coincide with each other during operation of the rotating machine. The stator driving unit rotates at least one movable stator by a predetermined angle in the circumferential direction of the rotor so that the phase of the induced voltage generated in the at least one movable stator is shifted from the phase of the induced voltage generated in the other stator.

  When the rotating machine stops, the stator driving unit can rotate the movable stator by a predetermined angle in the circumferential direction of the rotor. Thereby, in the movable stator, an induced voltage having a phase different from the induced voltage generated in the other stators is generated. Thereby, the induced voltage of the other stator can be canceled by the induced voltage of the movable stator, and the induced voltage of the entire stator can be reliably reduced.

  In the rotating machine, at least one movable stator may be configured such that the amplitude of the induced voltage to be generated is equal to that of the other stator. According to this configuration, it is possible to improve the canceling effect between the induced voltage generated in the movable stator and the induced voltage generated in the other stator as compared with the case where the amplitudes of the induced voltages of the movable stator and the other stator are different. Therefore, the induced voltage as the whole stator can be further reduced. When the rotating machine has a plurality of movable stators and / or a plurality of other stators, the amplitude of the combined voltage of the induced voltages in all the movable stators and the amplitude of the combined voltage of the induced voltages in all the other stators are substantially equal. Are preferably identical.

  When the rotating machine is stopped, the relative rotation angle of the at least one movable stator with respect to another stator may be (360 ° / number of poles of the rotor). When the position of the movable stator is shifted from the position of the other stator in the circumferential direction of the rotor (360 ° / number of poles of the rotor), the induced voltage of the movable stator has an opposite phase to the induced voltage of the other stator. Therefore, according to such a configuration, the induced voltage generated in the movable stator and the other stators can be canceled more reliably, and the induced voltage as the whole stator can be further reduced.

  Stators other than the movable stator may be configured to rotate at a predetermined angle in a direction opposite to the at least one movable stator when the rotating machine stops. That is, when the rotating machine is stopped, the movable stator and other stators may rotate in the reverse direction. According to this configuration, although both the movable stator and the other stator rotate, the rotation range can be reduced.

  According to the present invention, it is possible to more reliably reduce the generation of an induced voltage when the rotating machine is stopped.

FIG. 1 is a schematic diagram showing both side surfaces and a vertical cross section of a rotating machine according to a first embodiment of the present invention. FIG. 2 is a schematic diagram illustrating a state of the rotating machine according to the first embodiment at the time of stopping. FIG. 3 is a diagram illustrating a relationship between the induced voltage and the rotation angle of the rotor when the rotating machine according to the first embodiment is stopped. FIG. 4 is a diagram illustrating a relationship between the induced voltage and the rotation angle of the movable stator in the rotating machine according to the first embodiment. FIG. 5 is a diagram illustrating a relationship between the induced voltage of the rotating machine and the rotation angle of the rotor according to the comparative example of the first embodiment. FIG. 6 is a schematic view showing a vertical cross section of a rotating machine according to the second embodiment of the present invention. FIG. 7 is a diagram illustrating a relationship between the induced voltage and the rotation angle of the rotor when the rotating machine according to the second embodiment is stopped. FIG. 8 is a diagram illustrating a relationship between an induced voltage of a rotating machine and a rotation angle of a rotor according to a comparative example of the second embodiment. FIG. 9 is a diagram illustrating a relationship between the induced voltage and the rotation angle of the rotor when the rotating machine according to the modification of the first embodiment is stopped. FIG. 10 is a diagram showing the relationship between the induced voltage of the rotating machine and the rotation angle of the rotor according to a comparative example of the above modification.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same or corresponding components are denoted by the same reference numerals, and the same description is not repeated.

[First Embodiment]
First, a first embodiment of the present invention will be described.

{Configuration of rotating machine}
FIG. 1 is a schematic diagram illustrating a primary side (P side) side surface, a vertical cross section, and a secondary side (S side) side surface of a rotating machine 10 according to the first embodiment of the present invention. The rotating machine 10 can be applied to, for example, a vehicle-mounted motor, an aircraft starter generator, a wind power generator, a hydraulic power generator, or the like. As shown in FIG. 1, the rotating machine 10 includes a rotor 1, a plurality of stators 2, a stator driving unit 3, and a case 4.

  The rotor 1 is disposed inside the plurality of stators 2. That is, the rotating machine 10 in this embodiment is an inner rotor type rotating machine. The rotor 1 is accommodated in the case 4. The case 4 has a cylindrical case main body 41 and end plates 42 a and 42 b that seal both ends of the case main body 41.

  The rotor 1 rotates about the rotation shaft 11. The rotating shaft 11 extends in the central axis direction of the case body 41 and penetrates the end plates 42a and 42b. The P-side end and the S-side end of the rotary shaft 11 are rotatably supported by end plates 42a and 42b, respectively. Bearings 51a and 51b are provided between the P-side end of the rotating shaft 11 and the end plate 42a, and between the S-side end of the rotating shaft 11 and the end plate 42b, respectively.

  A load (not shown) such as an aircraft engine is connected to the P-side end of the rotating shaft 11. A sensor 6 is provided at the S-side end of the rotating shaft 11. The sensor 6 detects the rotation angle of the rotor 1 and outputs it to the control unit 20.

  The rotor 1 includes a columnar rotor body 12 and permanent magnets 13 a to 13 d disposed in the rotor body 12. The permanent magnets 13 a to 13 d are magnetized in the radial direction of the rotor body 12. More specifically, the permanent magnets 13a and 13b are magnetized from the radially outer side to the inner side of the rotor body 12, and the permanent magnets 13c and 13d are moved from the radially inner side of the rotor body 12 to the outer side. Magnetized.

  The plurality of stators 2 are accommodated in the case 4. The plurality of stators 2 are opposed to the rotor 1. More specifically, the plurality of stators 2 have a through hole extending in the central axis direction of the case body 41, and the rotor 1 is disposed in the through hole.

  The plurality of stators 2 include a fixed stator 21 and a movable stator 22. The fixed stator 21 is fixed to the inner peripheral surface of the case main body 41. The movable stator 22 is supported on the inner peripheral surface of the case body 41 so as to be rotatable in the circumferential direction of the rotor 1. The movable stator 22 is driven by the stator driving unit 3.

  Bearings 52 a and 52 b are provided between the movable stator 22 and the inner peripheral surface of the case body 41. The bearings 52a and 52b only have to make the movable stator 22 easy to rotate with respect to the inner peripheral surface of the case body 41, and may be, for example, a rolling bearing, a magnetic bearing, or a sliding bearing. In addition, by using high-pressure cooling oil on the outer peripheral surface of the movable stator 22 without forming the bearings 52a and 52b, and forming an oil film, the movable stator 22 can be easily rotated with respect to the inner peripheral surface of the case body 41. You can also.

  The fixed stator 21 and the movable stator 22 have the same number of slots. In the slots 211 and 221 of the fixed stator 21 and the movable stator 22, U-phase, V-phase, and W-phase windings 212 and 222 are formed in a distributed winding format. The number of turns of the winding 212 is equal to the number of turns of the winding 222. The windings 212 and 222 may be formed in a concentrated winding form in the slots 211 and 221 of the fixed stator 21 and the movable stator 22. The rotating machine 10 of the present embodiment is a three-phase rotating machine, but the present invention can also be applied to a single-phase or two-phase rotating machine or a rotating machine having four or more phases.

  The fixed stator 21 and the movable stator 22 have the same characteristics except for the number of slots and the number of winding turns. Here, the “same characteristics” are not limited as long as the design characteristics are the same, and errors caused in manufacturing are allowed.

  The stationary stator 21 and the movable stator 22 normally coincide with each other in the circumferential direction of the rotor 1. That is, when viewed from the P side or the S side, the positions of the slots 211 and 221 and the positions of the windings 212 and 222 of the phases of the fixed stator 21 and the movable stator 22 are the same.

  The stator driving unit 3 is configured to rotate the movable stator 22 in the circumferential direction of the rotor 1. The method by which the stator driving unit 3 rotates the movable stator 22 is not particularly limited. For example, the stator driving unit 3 may rotate the movable stator 22 by an actuator, or may rotate the movable stator 22 using a clutch. When the movable stator 22 is rotated by the actuator, a gear mechanism or a bearing mechanism may be provided between the movable stator 22 and the inner peripheral surface of the case body 41.

  The control unit 20 controls the operation of the rotating machine 10. The rotation angle of the rotor 1 detected by the sensor 6 is input to the control unit 20. The control unit 20, the fixed stator 21 (winding 212), and the movable stator 22 (winding 222) are electrically connected. The fixed stator 21 and the movable stator 22 may be connected in parallel or in series. The controller 20 supplies a three-phase alternating current corresponding to the rotation angle of the rotor 1 to the windings 212 and 222 during operation of the rotating machine 10.

  Control unit 20 includes an inverter. The rotating machine 10 has a plurality of stators 2 (a fixed stator 21 and a movable stator 22), but the control unit 20 only needs to have one inverter. This is because it is necessary to cancel the induced voltages of the fixed stator 21 and the movable stator 22 when the rotating machine 10 is stopped. The operation when the rotating machine 10 is stopped will be described later.

{Operation of rotating machine}
Next, the operation of the rotating machine 10 configured as described above will be described.

(During driving)
First, the operation during operation of the rotating machine 10 will be described. Here, “when the rotating machine 10 is in operation” refers to a time when current is supplied to the windings 212 and 222 and the rotor 1 is rotating. For example, when the rotating machine 10 is used as a starter generator, when the rotating machine 10 is in operation, the rotating machine 10 functions as an electric motor and supplies power to the engine to start or assist the engine. And when the rotating machine 10 is functioning as a generator after the engine is started.

  In FIG. 1, a reference point A1 of the fixed stator 21 and a reference point A2 of the movable stator 22 are shown. The reference points A1 and A2 are points shown in FIG. 1 and FIG. 2 described later for the sake of convenience in order to easily recognize the positional deviation between the fixed stator 21 and the movable stator 22. The reference points A1 and A2 are located at the upper ends of the fixed stator 21 and the movable stator 22 in FIG. In other words, when the rotating machine 10 is in operation (the state shown in FIG. 1), the position of the movable stator 22 in the circumferential direction of the rotor 1 matches that of the fixed stator 21.

  The control unit 20 supplies the windings 212 and 222 with a three-phase alternating current required when the rotating machine 10 is operated. For example, when the rotating machine 10 is used as a starter generator, the direction of the three-phase alternating current when the rotating machine 10 functions as an electric motor is opposite to the direction of the three-phase alternating current when the rotating machine 10 functions as a generator. It is. Further, the magnitude of the three-phase alternating current when the rotating machine 10 functions as an electric motor is larger than the magnitude of the three-phase alternating current when the rotating machine 10 functions as a generator.

  When the rotating machine 10 functions as an electric motor, the slots 211 and 221 of the fixed starter 21 and the movable starter 22 are excited by the three-phase alternating current supplied to the windings 212 and 222, and the rotor 1 rotates. At this time, power is generated in the rotating machine 10, and this power is supplied to a load such as an engine.

  On the other hand, when the rotating machine 10 functions as a generator, the rotor 1 rotates due to the rotation of a load (not shown) connected to the rotating shaft 11 and the three-phase alternating current supplied to the windings 212 and 222. At this time, electric power is generated in the rotating machine 10, and this electric power is supplied to a battery (not shown).

(When stopped)
Next, the operation when the rotating machine 10 is stopped will be described. The following operation may be performed when the rotating machine is normally stopped, but may not be performed when the rotating machine is normally stopped, and may be performed only when it is necessary to stop the rotating machine urgently.

  When stopping the rotating machine 10, the control unit 20 stops supplying the three-phase alternating current to the rotating machine 10. The stator driving unit 3 drives the movable stator 22.

  As shown in FIG. 2, the stator driving unit 3 rotates the movable stator 22 by a predetermined angle in the circumferential direction of the rotor 1 (around the rotation shaft 11) and stops it at a predetermined position. As a result, the position of the movable stator 22 is shifted from the position of the fixed stator 21 in the circumferential direction of the rotor 1. The rotation angle of the movable stator 22 at this time is preferably (360 ° / the number of poles of the rotor 1). In the example of FIG. 2, since the rotor 1 has four poles, the movable stator 22 is rotated by 90 °. That is, the reference point A2 located at the upper end of the movable stator 22 in FIG. 1 has moved to the right end of the movable stator 22 in FIG.

  Here, when the movable stator 22 is rotated by (360 ° / the number of poles of the rotor 1), the induced voltages V1 and V2 generated in the fixed stator 21 and the movable stator 22 respectively, and the combined voltage Vc of both induced voltages V1 and V2. An example of the waveform is shown in FIG. The induced voltages V1 and V2 shown in FIG. 3 and FIG. 5 to be described later are generated in the fixed stator 21 and the movable stator 22 in a state where no current is supplied to the windings 212 and 222 and the rotor 1 is rotating. This is a no-load induced voltage.

  As shown in FIG. 3, when the movable stator 22 is rotated by (360 ° / the number of poles of the rotor 1), the induced voltage V <b> 2 generated in the movable stator 22 has an opposite phase to the induced voltage V <b> 1 generated in the fixed stator 21. . In the present embodiment, since the characteristics of the fixed stator 21 and the movable stator 22 are the same, the amplitudes of the induced voltages V1 and V2 of the fixed stator 21 and the movable stator 22 are substantially equal. In this way, the fixed stator 21 and the movable stator 22 have the same characteristics, and the rotation angle of the movable stator 22 is set to (360 ° / number of poles of the rotor 1). The amplitude of the combined voltage Vc of the induced voltage V1 of the stator 21 and the induced voltage V2 of the movable stator 22 can be made substantially zero.

  The relative rotation angle of the movable stator 22 with respect to the fixed stator 21 may be smaller than (360 ° / number of poles of the rotor 1). Even when the relative rotation angle is smaller than (360 ° / the number of poles of the rotor 1), the phase of the induced voltage of the movable stator 22 can be shifted from the phase of the induced voltage of the fixed stator 21. Thereby, the induced voltages of the fixed stator 21 and the movable stator 22 cancel each other to some extent, and the combined voltage of both induced voltages can be reduced as shown in FIG.

  On the other hand, when the rotating machine 10 is stopped, the movable stator 22 does not rotate in the circumferential direction of the rotor 1 (as shown in FIG. 1, the positions in the circumferential direction of the rotor 1 coincide between the fixed stator 21 and the movable stator 22. 5), the phase of the induced voltage V2 of the movable stator 22 matches the phase of the induced voltage V1 of the fixed stator 21 as shown in FIG. Therefore, the induced voltage V1 of the fixed stator 21 and the induced voltage V2 of the movable stator 22 do not cancel each other, and the combined voltage Vc of both induced voltages V1 and V2 increases.

{Effect of the first embodiment}
As described above, in the rotating machine 10 according to the first embodiment, the stator driving unit 3 rotates the movable stator 22 in the circumferential direction of the rotor 1 when stopped. Thereby, the phase of the induced voltage of the fixed stator 21 and the phase of the induced voltage of the movable stator 22 are shifted, and the induced voltage of the fixed stator 21 and the induced voltage of the movable stator 22 are offset. For this reason, when the rotating machine 10 is stopped, the induced voltage generated as a whole of the stator 2 can be reduced.

  As described above, when the movable stator 22 is rotated by the stator driving unit 3, the induced voltage generated as a whole of the stator 2 is reliably reduced, so that the power generation by the rotating machine 10 can be stopped quickly. Therefore, it is particularly preferable that the stator driving unit 3 is operated when the rotating machine 10 is urgently stopped.

  Even when the rotating machine 10 is in operation, the movable stator 22 may be driven by the stator driving unit 3 as necessary. For example, the rotating machine 10 functions as an electric motor, and the magnet magnetic flux can be weakened by rotating the movable stator 22 when the rotating machine 10 rotates at a high speed. Thereby, it becomes unnecessary to perform field-weakening control by current control, and the efficiency of the system to which the rotating machine 10 is applied can be improved.

  As described above, in the rotating machine 10 according to the first embodiment, the induced voltage at the time of stopping is reduced by rotating the movable stator 22. For this reason, the rotor 1 is not provided with a mechanism for adjusting the magnetic flux. Thereby, since the centrifugal strength strength of the rotor 1 is ensured, the rotating machine 10 can be rotated at a high speed and the diameter can be increased.

  In the rotating machine 10 according to the first embodiment, the fixed stator 21 and the movable stator 22 have the same characteristics. For this reason, when the movable stator 22 rotates in the circumferential direction of the rotor 1 when the rotating machine 10 is stopped, the amplitude of the no-load induced voltage of the fixed stator 21 and the amplitude of the no-load induced voltage of the movable stator 22 are substantially equal. Become. Therefore, the induced voltage generated in the fixed stator 21 can be effectively canceled by the induced voltage generated in the movable stator 22 when the rotating machine 10 is stopped. As a result, the induced voltage generated as a whole of the stator 2 can be further reduced.

  In the first embodiment, the movable stator 22 is configured to rotate by an angle of (360 ° / number of rotor poles) from the position during operation when the rotating machine 10 stops. With this rotation angle, the no-load induced voltage of the movable stator 22 is in reverse phase with the no-load induced voltage of the fixed stator 21. For this reason, the induced voltage of the movable stator 22 and the induced voltage of the fixed stator 21 are surely offset. Therefore, the induced voltage generated as a whole of the stator 2 can be more reliably reduced.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.

  As shown in FIG. 6, the rotating machine 10A according to the second embodiment is different from the rotating machine 10 according to the first embodiment in that it includes three stators 2A.

  The three stators 2A include two fixed stators 21Aa and 21Ab and a movable stator 22. Each fixed stator 21Aa, 21Ab is fixed to the inner peripheral surface of the case main body 41, like the fixed stator 21 of the first embodiment. The movable stator 22 is disposed between the fixed stator 21Aa and the fixed stator 21Ab.

  The fixed stators 21Aa and 21Ab and the movable stator 22 have the same number of slots. Windings 212Aa and 212Ab are formed in the slots 211Aa and 211Ab of the fixed stators 21Aa and 21Ab, respectively. The number of turns of each of the windings 212 </ b> Aa and 212 </ b> Ab is half the number of turns of the winding 221 in the movable stator 22.

  The fixed stator 21Aa (winding 212Aa), the fixed stator 21Ab (winding 212Ab), and the movable stator 22 (winding 221) are electrically connected to the control unit 20A. The fixed stator 21Aa, the fixed stator 21Ab, and the movable stator 22 may be connected in parallel or may be connected in series.

  The control unit 20A controls the operation of the rotating machine 10A. Basic control by the control unit 20A is the same as in the first embodiment. That is, the control unit 20A supplies a three-phase alternating current to the three stators 21A (windings 212Aa, 212Ab, 221) during operation of the rotating machine 10A, and the windings 212Aa, Current supply to 212Ab and 221 is stopped. Hereinafter, only the operation when the rotating machine 10A is stopped will be described.

  When stopping the rotating machine 10A, the stator driving unit 3 rotates the movable stator 22 by a predetermined angle in the circumferential direction of the rotor 1 (around the rotation axis 11) and stops at a predetermined position, as in the first embodiment. Thereby, in the circumferential direction of the rotor 1, the position of the movable stator 22 is shifted from the positions of the fixed stators 21Aa and 21Ab. The rotation angle of the movable stator 22 is preferably (360 ° / the number of poles of the rotor 1), as in the first embodiment.

  Here, when the movable stator 22 is rotated by (360 ° / the number of poles of the rotor 1), induced voltages V1a and V1b generated in the fixed stators 21Aa and 21Ab, an induced voltage V2 generated in the movable stator 22, and three inductions, respectively. An example of the waveform of the combined voltage Vc of the voltages V1a, V1b, and V2 is shown in FIG. The induced voltages V1a, V1b, and V2 shown in FIG. 7 and FIG. 8 to be described later are not supplied to the windings 212Aa, 212Ab, and 221 and the rotor 1 is rotating, and the fixed stators 21Aa, 21Ab and This is a no-load induced voltage generated in each of the movable stators 22.

  As shown in FIG. 7, the induced voltage V2 generated in the movable stator 22 is in the opposite phase to the induced voltages V1a and V1b generated in the fixed stators 21Aa and 21Ab, as in the first embodiment. The amplitude of the combined voltage Vc of the induced voltages V1a and V1b of the fixed stators 21Aa and 21Ab and the induced voltage V2 of the movable stator 22 is substantially zero.

  On the other hand, when the rotating machine 10A is stopped, the movable stator 22 does not rotate in the circumferential direction of the rotor 1, and the positions in the circumferential direction of the rotor 1 are the same in the fixed stators 21Aa, 21Ab and the movable stator 22. As shown in FIG. 8, the phases of the induced voltages V1a, V1b, V2 of the fixed stators 21Aa, 21Ab and the movable stator 22 coincide with each other. Therefore, the induced voltages V1a and V1b of the fixed stators 21Aa and 21Ab and the induced voltage V2 of the movable stator 22 are not canceled out.

  As described above, even in the rotating machine 10A including the two fixed stators 21Aa and 21Ab and the movable stator 22, the induced voltage of the fixed stators 21Aa and 21Ab and the induction of the movable stator 22 are obtained by rotating the movable stator 22 when stopped. The voltage can be offset. Therefore, the rotating machine 10A according to the second embodiment can also reduce the induced voltage of the entire stator 2A.

  The rotating machine of the present invention can also include four or more stators. The plurality of stators may include three or more fixed stators, and may include two or more movable stators. Regardless of the number of fixed stators and movable stators, the movable stator may be rotated in the circumferential direction of the rotor to shift the position of the fixed stator and the position of the movable stator in the circumferential direction of the rotor.

[Modification]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In the first embodiment, the number of turns of the winding 212 in the fixed stator 21 and the number of turns of the winding 222 in the movable stator 22 are the same, but the number of turns may be different. Even if the number of turns of the stator theta 21 and the number of turns of the movable stator 22 are different, if the movable stator 22 is rotated in the circumferential direction of the rotor 1, the fixed stator 21 and the movable stator Since the phase of the induced voltage 22 is shifted, the induced voltages of the fixed stator 21 and the movable stator 21 cancel each other.

  9 and 10 show no-load induced voltages V1, V2 of the fixed stator 21 and the movable stator 22 when the number of turns of the winding 212 of the stator stator 21 and the number of turns of the winding 222 of the movable stator 22 are different. In addition, an example of the waveform of the combined voltage Vc of both induced voltages V1 and V2 is shown. However, FIG. 9 shows a voltage waveform when the rotation angle of the movable stator 22 is 0 °, and FIG. 10 shows a voltage waveform when the rotation angle of the movable stator 22 is (360 ° / number of poles of the rotor 1). Show. As shown in FIGS. 9 and 10, by rotating the movable stator 22, the induced voltages V1 and V2 of the fixed stator 21 and the movable stator 21 are canceled out, and the induced voltages V1 and V2 of the fixed stator 21 and the movable stator 21 are reduced. The amplitude of the composite voltage Vc is small. Thus, even if the number of turns of the winding 212 of the stator stator 21 and the number of turns of the winding 222 of the movable stator 22 are different, the induced voltage of the stator 2 as a whole can be reduced.

  In each of the above embodiments, the plurality of stators 2 and 2A are accommodated in one case 4, but the plurality of stators can be separately accommodated in two or more cases.

  In each of the embodiments described above, the inner rotor type rotating machines 10 and 10A have been described. It can be applied to a rotating machine. When the present invention is applied to an axial motor, a rotor is disposed between the fixed stator and the movable stator, and the movable stator may be rotated in the circumferential direction of the rotor (around the rotation axis of the rotor).

  The configuration of the rotor in the present invention is not particularly limited. For example, in each of the above embodiments, the rotor 1 having one rotor body 12 is used, but a rotor having a shape in which two or more rotor bodies are connected and the rotation axes of the rotor bodies are connected can also be used. . Further, for example, various types of rotors such as an SPM type rotor, an IPM type rotor, and a type of rotor in which a magnetic flux is short-circuited in the rotor can be used in the present invention.

  In each of the above embodiments, the stators (fixed stators 21, 21Aa, 21Ab) other than the movable stator 22 are fixed to the case 4, but the stators other than the movable stator can also rotate in the circumferential direction of the rotor (around the rotating shaft 11). It can be configured as follows. In this case, when stopping the rotating machine, not only the movable stator but also a stator other than the movable stator is rotated. As a result, similarly to the above embodiments, the induced voltages of the movable stator and other stators can be shifted in phase, and the induced voltages of the movable stator and other stators can be offset. Also in this case, it is preferable that the deviation (relative rotation angle) of the angle of the movable stator with respect to the stator other than the movable stator is (360 ° / the number of poles of the rotor). By rotating the stator other than the movable stator, the rotation range of the movable stator can be reduced.

10, 10A Rotating machine 1 Rotor 11 Rotating shaft 2, 2A Multiple stators 22 Movable stator 21 Fixed stator (other stator)
3 Stator drive

Claims (4)

A rotating machine,
A rotor that rotates about a rotation axis;
A plurality of stators arranged to face the rotor and including at least one movable stator;
A stator driving unit capable of driving the at least one movable stator when the rotating machine stops;
With
The plurality of stators have the same number of slots, and are arranged so that the positions in the circumferential direction of the rotor coincide with each other during operation of the rotating machine,
The stator driving unit rotates the at least one movable stator by a predetermined angle in the circumferential direction of the rotor so that the phase of the induced voltage generated in the at least one movable stator is shifted from the phase of the induced voltage generated in another stator. , Rotating machine. The rotating machine according to claim 1,
The rotating machine, wherein the at least one movable stator is configured such that an amplitude of an induced voltage to be generated is equal to that of the other stator. The rotating machine according to claim 1 or 2,
When the rotating machine is stopped, the relative rotating angle of the at least one movable stator with respect to the other stator is (360 ° / the number of poles of the rotor). The rotating machine according to any one of claims 1 to 3,
The other stator rotates at a predetermined angle in a direction opposite to the at least one movable stator when the rotating machine stops.

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