JP4120347B2 - Rotating electric machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating electrical machine including a permanent magnet in a rotor.
[0002]
[Prior art]
Conventionally, in an electric motor in which a permanent magnet is embedded in a rotor, there is an electric motor that moves the rotor in the axial direction in accordance with the rotational speed of the rotor, thereby reducing the interlinkage magnetic flux to the stator and suppressing the induced power during high-speed rotation. (For example, refer to Patent Document 1). In the prior art, a weight (weight) that rotates together with the rotor body is provided, and centrifugal force is generated in the weight by the rotation of the rotor. Furthermore, the rotor body connected by the weight and the wire moves in the axial direction by utilizing the centrifugal force acting on the weight. By suppressing the induced voltage during high-speed rotation, the current can be reduced and the efficiency is improved. Further, the output can be slightly increased.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 5-300712 (FIG. 1)
[0004]
[Problems to be solved by the invention]
However, in the prior art, a mechanism for moving a very heavy rotor is required. Also, it is not easy to provide a large power source for this mechanism, and the dimensions of the mechanism also increase.
[0005]
The present invention provides a simple device that reduces the interlinkage magnetic flux to the stator and suppresses the induced power during high-speed rotation.
[0006]
[Means for Solving the Problems]
The present invention provides a rotating electrical machine comprising a stator having a stator core and a stator winding provided on the stator core, and a rotor having a plurality of permanent magnets that can rotate with respect to the stator. The permanent magnet has a cylindrical shape and a magnetization direction substantially perpendicular to the direction of the central axis of the permanent magnet, and is arranged substantially parallel to the rotation axis of the rotor, and at least one permanent magnet is arranged at the center of the permanent magnet. a drive mechanism for rotating relative to said rotor about an axis, characterized by increasing or decreasing the flux linkage with respect to the stator by rotating the pre-Symbol least one permanent magnet to the rotor.
[0007]
[Action / Effect]
According to the present invention, the magnetization direction of a cylindrical permanent magnet can be rotated with respect to the stator. For this reason, the flux linkage with respect to the stator can be easily increased or decreased.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. The embodiment will be described for an electric motor.
[0009]
FIG. 1 is a sectional side view in the axial direction of an electric motor according to a first embodiment of the present invention. FIG. 2 shows a cross section perpendicular to the axial direction of the rotor according to the first embodiment of the present invention, which is a cross section taken along the line II-II in FIG.
[0010]
1 and 2, the electric motor includes a rotating shaft 1, a rotor 3 disposed around the rotating shaft 1, a stator 5 disposed around the rotor 3, and a case 7 for housing the stator 5. ing. The rotor 3 and the stator 5 each have a cylindrical shape extending in the axial direction. Further, a gap called an air gap exists between the rotor 3 and the stator 5 and does not contact each other. The stator core 6 of the stator 5 is provided with a winding 11. A rotating magnetic field generated by an alternating current flowing through the winding 11 exerts a reaction force on the permanent magnet 9, and the rotor 3 rotates together with the rotating shaft 1.
[0011]
In the vicinity of the outer peripheral surface of the rotor 3, a plurality of cylindrical permanent magnets 9 are embedded substantially parallel to the rotating shaft 1 and on substantially the same circumference with respect to the axis of the rotating shaft 1. Here, the columnar shape may be a cylindrical shape as long as the outer shape is a columnar shape and the inside is a cavity. The case 7 includes a cylindrical plate 7a that contacts and fixes the stator 5 and side plates 7b and 7c that block openings at both axial ends of the cylindrical plate 7a. Both ends of the rotating shaft 1 are supported by side plates 7 b and 7 c of the case 7 via bearings 16 and can rotate with respect to the stator 5 and the case 7. A rotation sensor 12 that detects the rotation speed (the number of rotations per unit time) of the rotating shaft 1 is attached to the outer surface of one side plate of the case 7.
[0012]
The electric motor further includes a magnet drive mechanism 10 that rotates the cylindrical permanent magnet 9 around its central axis 4. Therefore, the cylindrical permanent magnet 9 revolves around the rotation axis 1 together with the rotor, and rotates (tilts) around its own central axis 4. Although not shown in the drawing, in order for the cylindrical permanent magnet 9 to rotate smoothly, a slight gap is provided between the shaft hole 3a of the rotor 3 and the permanent magnet 9 inserted therein. The magnetization direction (magnetization direction) 20 of the permanent magnet 9 is substantially perpendicular to the direction of the central axis 4, and is also perpendicular to the direction of the rotation axis 1. The magnetization direction 20 of the permanent magnet 9 is also tilted. The magnetization direction 20 is indicated by an arrow in FIG.
[0013]
As shown in FIG. 2, two adjacent permanent magnets 9a and 9b form a magnet pair 8, and the magnet pair 8 constitutes one magnetic pole (S or N pole). The magnet pairs 8 are arranged at predetermined intervals (for example, 45 °) in the circumferential direction of the rotor 3 so that adjacent magnetic poles are different from each other. Here, the distance between two permanent magnets 9a and 9b belonging to a certain magnet pair 8 is considerably smaller than the distance between adjacent magnet pairs 8 and 8 ', and the magnet pair 8 is regarded as one magnet. be able to. Further, since all the permanent magnets 9a and 9b are arranged at substantially the same distance in the radial direction of the rotor from the rotor central shaft 13, the two permanent magnets 9a and 9b are arranged in plane symmetry with respect to it. A central plane 14 extending in the diametric direction of the rotor is defined.
[0014]
Of course, it is possible to form one magnetic pole as usual with one magnet without arranging two permanent magnets 9a and 9b as a pair and constituting one magnetic pole. Moreover, one magnetic pole can also be comprised with three or more magnets.
[0015]
Here, a “tilt angle (rotation angle)” θ indicating the degree of rotation of the permanent magnet 9 relative to the rotor 3 is defined. The reference of the tilt angle θ is set in the direction of the central plane 14 extending in the diameter direction between the two permanent magnets 9a and 9b, and the tilt angle θ of the permanent magnet 9a and the permanent magnet 9b is determined by the magnetization direction and the central plane 14. Is defined as the angle between. That is, when the direction of magnetization of the permanent magnet is parallel to the center plane 14, the tilt angle θ is zero, and when it is perpendicular, the tilt angle θ is 90 °.
[0016]
FIG. 3 is a diagram showing a cylindrical magnet embedded in the rotor of the electric motor according to the first embodiment of the present invention. As shown in FIG. 3, a magnet end gear 15 is attached to one side of the permanent magnet 9. At the other end, a magnet support plate 17 is attached to be wound around the magnet so as to form a columnar shape. The permanent magnet 9 is rotatably supported with respect to the rotor 3 by the magnet end gear 15, the shaft portion 18 of the magnet end gear 15, and the magnet support plate 17. The rotor 3 is provided with a hole (not shown) that fits the shaft portion 18 of the magnet end portion gear 15 to support the shaft portion 18.
[0017]
Next, the magnet drive mechanism 10 will be described in detail with reference to FIGS. 4 and 5 in addition to FIG.
[0018]
The magnet drive mechanism 10 includes a hydraulic actuator 19 that is operated by hydraulic pressure transmitted through an oil passage 27 provided in the rotary shaft 1 of the rotor 3. The hydraulic actuator 19 includes a rack 21 (bar gear) that expands and contracts according to the hydraulic pressure, and a pinion 23 (circular gear) that engages with the rack 21. The pinion 23 is pivotally supported by the rotor 3 and is rotatable with respect to the rotor 3. Moreover, since the tip of the rack 21 is connected to a spring 29 as an elastic body coupled to the rotor 3, the rack 21 can be moved by a distance substantially proportional to the hydraulic pressure. In this case, the tilt angle is also substantially proportional to the hydraulic pressure.
[0019]
The racks 21 extend radially from the axis of the rotary shaft 1, that is, the rotor central shaft 13, and are arranged at equal angular intervals. Further, the rack 21 is movable in the radial direction along the sliding groove 22 (sliding hole) formed in the rotor 3 so as to be positioned in the middle of the magnet pair 8. The spring 29 is coupled to the end surface of the sliding groove 22 and the end portion of the rack 21 and is disposed in the sliding groove 22.
[0020]
The pinion 23 rotates due to the expansion and contraction of the rack 21, and the magnet end gear 15 that engages with the pinion 23 also rotates. In this embodiment, by providing teeth on both side surfaces of the rack 21, the two pinions 23 provided on both side surfaces of the rack 21 are driven by one rack 21. When the rack 21 extends due to an increase in hydraulic pressure, the two pinions 23 rotate in opposite directions, and further tilt in the opposite direction to the pinions with which the two permanent magnets 9a and 9b forming the magnet pair 8 are engaged. (Rotate.
[0021]
As described above, the change in the position of the rack 21 in the linear direction, that is, the axial direction using the hydraulic pressure is converted into the change in the rotation direction using the gear, so that the magnetization direction of the permanent magnet 9 is not affected by the rotation of the rotor 3. Can be changed relative to the rotor 3.
[0022]
When one magnetic pole is constituted by one magnet as usual, one of the permanent magnets 9a and 9b may be deleted, and a structure in which teeth are provided only on one side of the rack 21 is sufficient. Furthermore, the magnet drive mechanism 10 may be configured to tilt only the permanent magnets 9 belonging to some of the poles.
[0023]
Next, with reference to FIG. 6, the control apparatus of an electric motor is demonstrated.
[0024]
The motor control device includes the above-described magnet drive mechanism 10, a hydraulic pump 41 that supplies hydraulic pressure to the magnet drive mechanism 10, and an oil passage 27 of the magnet drive mechanism 10 that is coupled to the hydraulic pump 41 via a fixing seal. Piping 43 coupled through an exercise seal, an inverter 45 for supplying a current to the electric motor 50, a current sensor 47 for detecting the current, a voltage sensor 49 for detecting a voltage applied to the electric motor 50 from the inverter 45, And a controller 60 for controlling the inverter 45 and the hydraulic pump 41. In the present embodiment, the inverter 45 supplies an alternating current to the electric motor in a three-phase three-wire system, the current sensor 47 detects a line current, and the voltage sensor 49 detects a line voltage. Signals from the rotation sensor 12, the current sensor 47, and the voltage sensor 49 are input to the controller 60 via an input / output interface. The hydraulic pump 41 supplies hydraulic pressure as a driving force to the magnet driving mechanism 10 and functions as a driving force source for the magnet driving mechanism 10.
[0025]
The controller 60 is composed of a microcomputer having a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and an input / output interface (I / O interface) which are coupled to each other via a bus. ing.
[0026]
The controller 60 sets a three-phase alternating current to be supplied from the inverter 45 and outputs a current command value corresponding to this current to the inverter 45. The inverter 45 supplies current to the electric motor 50 based on the current command value. Further, the controller 60 determines the hydraulic pressure that should be generated by the hydraulic pump 41 and outputs a hydraulic pressure command value corresponding to this hydraulic pressure to the hydraulic pump 41. The inverter 45 and the hydraulic pump 41 are electrically coupled to the controller 60 and have an interface for receiving commands from the controller 60. The controller 60 sets a target tilt angle θ according to at least one of the rotational speed of the rotor 3 detected by the rotation sensor 12, the current value detected by the current sensor 47, and the voltage value detected by the voltage sensor 49, The hydraulic pressure for realizing the tilt angle θ is determined with reference to a map, function, etc. (not shown). The hydraulic pressure may increase monotonously with the target value of the tilt angle θ. In general, an increase in the rotational speed of the rotor 3 causes an increase in the current and voltage supplied from the inverter 45, so that the current value and voltage value are an indication of the rotational speed. For this reason, it is possible to reduce the induced voltage in the high rotation region by detecting the current value or the voltage value and setting the tilt angle θ accordingly without detecting the rotation speed.
[0027]
A control routine for controlling the tilt angle of the permanent magnet 9 executed by the controller 60 will be described with reference to the flowchart of FIG. The controller 60 repeatedly executes a control routine every predetermined time during operation of the electric motor.
[0028]
In step S1, the rotational speed of the rotor, the current supplied to the motor, or the voltage supplied to the motor is read.
[0029]
In step S2, the map is referred to. When the rotational speed is detected, the map in FIG. 8A showing the relationship between the tilt angle θ and the rotational speed is referred to. When the current is detected, the map between the tilt angle θ and the current is shown in FIG. When the map of b) is referred to and the voltage is detected, the map of FIG. 8C showing the relationship between the tilt angle θ and the voltage is referred to. In these maps, the tilt angle θ increases with increasing rotational speed, current or voltage. That is, the relationship between the tilt angle θ and the rotation speed, current, or voltage is set such that the induced voltage generated in the stator winding 11 in the high rotation region decreases due to the reduction of the linkage flux. The map of FIG. 8A, the map of FIG. 8B, and the map of FIG. 8C are stored in the ROM of the microcomputer. These maps are shown as examples, and various changes can be made depending on the characteristics of the motor.
[0030]
In step S3, a target value of the tilt angle θ (rotation angle) is determined according to the read rotation speed, current, or voltage.
[0031]
In step S4, the hydraulic pump 41 is commanded to apply a hydraulic pressure corresponding to the target value of the tilt angle θ, and the hydraulic actuator 19 of the magnet drive mechanism 10 is controlled. In this way, the permanent magnet 9 rotates.
[0032]
With reference to FIG. 9 and FIG. 10, the effect by the tilt angle control of said permanent magnet 9 is demonstrated concretely.
[0033]
Referring to FIG. 9A, the induced voltage decreases as the tilt angle θ increases. That is, by increasing the tilt angle θ in the high rotation region, the magnetic flux linked to the winding 11 of the stator 5 can be reduced, and accordingly, the induced voltage generated in the winding 11 of the stator 5 is reduced in the high rotation region. it can.
[0034]
FIG. 9B shows how the magnetization direction of the permanent magnet 9 rotates with the tilt angle θ. In this embodiment, one magnetic pole is composed of two permanent magnets 9a and 9b, and the tilt angle θ of each magnet changes at the same angle (in the same phase). The interlinkage magnetic flux can be easily changed greatly.
[0035]
Referring to FIGS. 10A and 10B, when the permanent magnet 9 is rotated according to the rotor rotational speed, the efficiency of the electric motor is compared with the case where the permanent magnet 9 remains fixed to the rotor 3. And the maximum output increases.
[0036]
With reference to FIG. 11 and FIG. 12, 2nd embodiment which concerns on the magnet drive mechanism 10 is described. In FIG. 11, the axially movable portion 53 and the rotating shaft 1 are drawn with a part omitted.
[0037]
In the present embodiment, the magnet drive mechanism 10 includes an axially movable portion 53 that can slide relative to the rotational shaft 1 in the axial direction of the rotational shaft 1 by hydraulic pressure, and a helical shaft screw 55 of the axially movable portion 53. On the other hand, it includes a rotationally movable portion 57 connected by a corresponding cylindrical screw (not shown) provided on the inner peripheral portion, and an axial drive unit 61 that moves the axially movable portion 53 in the axial direction by hydraulic pressure. The rotational direction movable part 57 does not move in the axial direction but is displaced in the rotational direction. The rotationally movable portion 57 converts the movement of the axially movable portion 53 in the axial direction of the rotational shaft 1 into rotation around the rotational shaft 1. The rotation direction movable portion 57 includes an annular gear 59 provided on the outer periphery, and tilts the permanent magnet 9 by transmitting rotation through the pinion 23 engaged with the rotation direction movable portion 57. However, in order to rotate the permanent magnets 9 a and 9 b forming a pair in opposite directions, the pinion 23 a that transmits the rotation to the permanent magnet 9 a is further engaged with another idler gear 24. The rotation of the permanent magnet 9 a is transmitted from the idler gear 24 via the magnet end gear 15.
[0038]
Referring to FIG. 12, the axially movable portion 53 moves in the rotational axis direction by the hydraulic pressure from the hydraulic pump 41 via the axial direction drive unit 61. Although the axial drive unit 61 is fixed to the case 7, the axially movable portion 53 rotates together with the rotary shaft 1. The axial direction drive unit 61 includes a hydraulic piston 62, and the piston rod 63 of the hydraulic piston 62 holds a cylindrical or ball-shaped rolling element 67 that comes into contact with the disk portion 53a of the axially movable portion 53 so as to allow rolling. A bearing 64 is configured. An annular piston rod 63 of the hydraulic piston 62 presses the disk portion 53a through the thrust bearing 64 from the axial direction. The axial drive unit 61 further includes another thrust bearing 64 ′ on the opposite side of the disk portion 53 a from the hydraulic piston 62, and this thrust bearing 64 ′ is connected to the axial drive unit 61 via a return spring 65. Is coupled to the body. The hydraulic pressure is controlled in the same manner as in the first embodiment according to the rotor rotational speed. Moreover, you may use the structure provided with the roller rotatably supported with respect to the piston rod 63 instead of a thrust bearing.
[0039]
With reference to FIG. 13, 3rd embodiment which concerns on the magnet drive mechanism 10 is described.
[0040]
In the present embodiment, the magnet drive mechanism 10 includes an axially movable portion 71 that is movable in the direction of the rotation shaft 1 by hydraulic pressure, and a grooved gear 73 that is rotated by an axial displacement of the axially movable portion 71. The axially movable portion 71 includes a cylindrical body portion 71a that is parallel to the axial direction and a rod-like engagement portion 71b that has a pointed tip 71c and extends in the rotor radial direction. The grooved gear 73 is formed in a spiral shape in which a cylindrical gear portion 73 a that engages with the magnet end gear 15 of the permanent magnet 9 and a tip 71 c of the engaging portion 71 b of the axially movable portion 71 slide. It is comprised from the substantially cylindrical groove part 73b which has a groove | channel on an outer peripheral surface.
[0041]
As in the second embodiment, the axial drive unit 61 moves in the axial direction by pressing the disk portion 71d of the axially movable portion 71 via the thrust bearing 64 in the axial direction.
[0042]
FIG. 14A is a side view of the grooved gear 73 illustrating how the grooved gear 73 rotates due to the axial position change of the axially movable portion 71. The tip 71c of the axially movable portion 71 is in contact with the bottom of the groove and moves in the axial direction from the end surface of the groove 73b toward the gear portion 73a, and the grooved gear 73 rotates 90 °. Further, referring to FIG. 14B, according to this movement of the axially movable portion 71, the permanent magnet 9 rotates until the tilt angle θ changes from 0 ° to 90 °. Since it is sufficient for the permanent magnet 9 to rotate 90 °, the groove of the groove 73b only needs to be formed over 90 ° in the circumferential direction of the groove 73b.
[0043]
With reference to FIG. 15, a fourth embodiment relating to the tilting of the permanent magnet will be described.
[0044]
In the first embodiment, the permanent magnets 9a and 9b provided in pairs are tilted synchronously with the same tilt angle by the common magnet drive mechanism 10, but the magnet drive mechanism 10 is individually provided with respect to the permanent magnets 9a and 9b. As shown in FIG. 15A, the permanent magnets 9a and 9b can be tilted with different phases, that is, with different tilt angles. Further, in addition to providing the magnet drive mechanism 10 individually for the permanent magnets 9a and 9b, the permanent magnets 9a and 9b can be individually controlled by the controller 60 by providing an oil passage and a hydraulic pump individually. Is possible. Further, the permanent magnets 9a and 9b can be tilted with different phases by making the pitches of the gears provided on both side surfaces of the rack 21 different.
[0045]
Referring to FIG. 15B, in consideration of the rotation direction of the rotor 3, etc., the permanent magnets 9a, 9b are preferably controlled in different phases, compared with the case where the permanent magnets 9a, 9b are controlled in the same phase. The maximum torque of the motor can be increased.
[0046]
In the above embodiment, two permanent magnets are provided per one pole, but one pole may be composed of one, three, or more permanent magnets. Although the stator winding is not defined, the stator winding may be concentrated winding or distributed winding. Although the stator core has a monolithic structure, the stator core may have a split structure. Moreover, although the number of poles of the electric motor is eight, the present invention can be applied to electric motors having other numbers of poles. Furthermore, the present invention can be applied to a rotating electrical machine that operates as an electric motor, a generator, or both, regardless of whether it is AC or DC.
[0047]
The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.
[Brief description of the drawings]
FIG. 1 is a sectional side view in an axial direction of an electric motor according to a first embodiment of the present invention. However, a part of the rotor is cut away so that the permanent magnet and the pinion can be seen directly.
2 is a cross-sectional view perpendicular to the axial direction of the rotor according to the first embodiment, showing a cross-section along the line II-II in FIG.
FIG. 3 is a perspective view showing a permanent magnet of the rotor of the electric motor according to the first embodiment.
4 is a cross-sectional view taken along line IV-IV in FIG. 1 and perpendicular to the axial direction of the rotor according to the first embodiment, and shows a cross section of a magnet drive mechanism of a permanent magnet provided in the rotor. FIG.
FIG. 5 is a perspective view of a magnet drive mechanism according to the first embodiment.
FIG. 6 is a schematic view showing a motor control device.
FIG. 7 is a flowchart showing a control routine for tilt angle control of a permanent magnet.
FIG. 8A is a map showing the relationship between the tilt angle θ of the permanent magnet and the rotational speed of the rotor. (B) It is a map which shows the relationship between the inclination angle (theta) of a permanent magnet, and the electric current of an electric motor. (C) It is a map which shows the relationship between the inclination angle (theta) of a permanent magnet, and the voltage of an electric motor.
FIG. 9A is a graph showing the relationship between the tilt angle θ of the permanent magnet and the induced voltage. (B) It is a figure which shows a mode that the direction of magnetization of a permanent magnet rotates with inclination-angle (theta).
FIG. 10A is a graph showing the efficiency of the electric motor when the permanent magnet is tilted according to the rotational speed of the rotor and when the permanent magnet remains fixed to the rotor. (B) It is a graph which shows the maximum output of the electric motor when a permanent magnet is tilted according to the rotational speed of a rotor, and a permanent magnet is fixing with respect to a rotor.
FIG. 11 is a perspective view showing a part of a magnet drive mechanism according to a second embodiment.
FIG. 12 is a schematic cross-sectional view in the axial direction showing a magnet drive mechanism according to a second embodiment.
FIG. 13 is a schematic sectional view in the axial direction showing a magnet drive mechanism according to a third embodiment.
FIG. 14A is a side view of the grooved gear for explaining a state in which the grooved gear of the magnet drive mechanism rotates due to the axial position change of the axially movable portion. (B) It is a figure which shows a mode that a permanent magnet tilts by the position change of the axial direction of an axial direction movable part.
FIG. 15A is a diagram illustrating a state in which two permanent magnets forming a pair are tilted in different phases or in the same phase. (B) It is a figure which shows the maximum torque of an electric motor in case two permanent magnets incline in another phase or the same phase.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating shaft 3 Rotor 4 Permanent magnet central axis 5 Stator 6 Stator core 8 Magnet pair 9 which comprises one pole from two permanent magnets 9 Cylindrical permanent magnet 11 Stator winding 12 wound around stator core Rotation sensor 15 Magnet end gear DESCRIPTION OF SYMBOLS 19 Hydraulic actuator 20 The arrow 23 which shows the direction of magnetization of a permanent magnet 23 Pinion 27 Oil path 41 Hydraulic pump 45 Inverter 47 Current sensor 49 Voltage sensor 50 Electric motor 60 Controller

Claims (11)

In a rotating electrical machine comprising a stator having a stator core and a stator winding provided on the stator core, and a rotor having a plurality of permanent magnets rotatable with respect to the stator,
The plurality of permanent magnets have a columnar shape and a magnetization direction substantially perpendicular to the central axis direction of the permanent magnet, and are arranged substantially parallel to the rotation axis of the rotor,
A drive mechanism for rotating at least one permanent magnet relative to the rotor about a central axis of the permanent magnet;
Rotary electric machine characterized by increasing or decreasing the flux linkage with respect to the stator by rotating the pre-Symbol least one permanent magnet to the rotor.   The rotating electrical machine according to claim 1, wherein at least one magnetic pole of the rotor is composed of a plurality of permanent magnets.   At least one magnetic pole of the rotor is arranged symmetrically with respect to the central plane in the diametrical direction of the rotor and is constituted by two adjacent magnets, and the magnetization directions of the two magnets are in the central plane. The rotating electrical machine according to claim 2, wherein the rotating electrical machines have equal angles to each other.   The rotating electrical machine according to claim 1, wherein the drive mechanism is controlled by a control device outside the rotating electrical machine.   The said control apparatus is provided with the drive force source which supplies the drive force of the said drive mechanism, and the controller which controls a drive force by electrically couple | bonding with the said drive force source. The rotating electrical machine described. The control device includes a rotation sensor that detects a rotation speed of the rotor and outputs the rotation speed to the controller.
The controller of the control device controls the driving force according to the rotation speed, whereby the magnetization direction of the at least one permanent magnet changes with the rotation speed. Rotating electric machine. The control device includes a current sensor that detects a current flowing through the rotating electrical machine and outputs the current to the controller;
6. The rotation according to claim 5, wherein the controller of the control device controls the driving force according to the current, whereby the magnetization direction of the at least one permanent magnet changes according to the current. Electric. The control device includes a voltage sensor that detects a voltage supplied to the rotating electrical machine and outputs the voltage to the controller.
6. The rotation according to claim 5, wherein the controller of the control device controls the driving force according to the voltage, so that the magnetization direction of the at least one permanent magnet changes according to the voltage. Electric. The driving force source supplies a driving force in a linear direction to the driving mechanism;
The rotating electrical machine according to claim 5, wherein the driving mechanism includes an actuator that expands and contracts by the driving force in the linear direction, and a gear that rotates by the expansion and contraction of the actuator.   The rotating electrical machine according to claim 5, wherein the driving force source is a hydraulic pump, and the driving force is hydraulic.   The rotating electrical machine according to claim 2, wherein the permanent magnets constituting at least one magnetic pole of the rotor are rotated at different rotation angles by the drive mechanism.

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