JP2009273247A - Rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating electric machine capable of suppressing an increase in induced counter-electromotive force due to the temperature of permanent magnets. <P>SOLUTION: The rotating electric machine includes permanent magnets in either of a stator or a rotor. The amount of magnetic flux of the stator or the rotor mounted with the permanent magnets is changed in response to the temperature of the permanent magnets. When the permanent magnets are mounted in the rotor, the rotor 20 includes an outer circumferential side rotation part 22 having the permanent magnets 34 and coils 36 and an inner circumferential side rotation part 24. In response to the temperature of the permanent magnets, switching is performed between an integrated rotation state in which the inner circumferential side rotation part 24 and a rotor rotating shaft 18 are integrally rotated and a relative rotation state in which the outer circumferential side rotation part 22 and the inner circumferential side rotation part 24 are relatively rotated by separating the inner circumferential side rotation part 24 from the rotor rotating shaft 18 and a change in magnetic flux passing through the coils 36 on the outer circumferential side rotation part 22 is generated so that the coils 36 are heated due to electromagnetic induction and the heat is applied to the permanent magnets 34. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine, and more particularly to a rotating electrical machine including a permanent magnet.

  In a rotating electrical machine in which a permanent magnet is provided in either the stator or the rotor, when the amount of magnetic flux of the stator or rotor having the permanent magnet is changed, the generated torque is changed and the induced counter electromotive voltage is changed. If this induced counter electromotive voltage becomes excessive, the coil of the rotating electrical machine, the inverter circuit element that controls the rotating electrical machine, and the like may be damaged.

  Therefore, for example, in Patent Document 1, as a magnetic flux amount variable magnet type rotor, an excessive armature induced voltage is generated during high-speed rotation if a sufficiently large magnet magnetic field is ensured to ensure low-speed torque. Is used to move the permanent magnet of the rotor in the axial direction to deviate from the rotor core and demagnetize it.

  Further, in Patent Document 2, in a rotating field generator using a permanent magnet as a rotor, a wide portion is provided on the outer peripheral side in the radial direction and a narrow portion is provided on the inner peripheral side between the four permanent magnets of the rotor. Disclosed is a configuration in which grooves each having a portion are provided and a magnet that can be moved by a centrifugal force in a radial direction in a narrow portion and a spring for resisting the centrifugal force are disposed. As a result, it is stated that the magnetic flux of the four magnets can be reduced by moving the magnet toward the wide portion as the rotational speed increases.

JP 2004-336880 A JP 7-288940 A

  The magnetic field generated by the permanent magnet depends on the temperature characteristics of the material, but generally weakens on the high temperature side. This phenomenon is sometimes referred to as high temperature side demagnetization, but conversely, the magnetic field generated by the permanent magnet becomes strong on the low temperature side. Therefore, when the rotating electrical machine having a permanent magnet operates on the low temperature side, the induced back electromotive force increases. In this state, for example, when a failure occurs in the control system under high-speed rotation of the rotating electrical machine, there is a risk that the circuit elements of the inverter that controls the rotating electrical machine will be damaged.

  In the prior art, it is described that the amount of magnetic flux during high-speed rotation is suppressed, but there is no mention of suppression of the induced back electromotive force due to the strong magnetic field generated by the permanent magnet at low temperatures.

  The objective of this invention is providing the rotary electric machine which can suppress the increase in the induced back electromotive force by the temperature of a permanent magnet.

  A rotating electrical machine according to the present invention includes: a permanent magnet provided in either the stator or the rotor; and a magnetic flux amount changing unit that changes the magnetic flux amount of the stator or the rotor provided with the permanent magnet according to the temperature of the permanent magnet. It is characterized by providing.

  Further, in the rotating electrical machine according to the present invention, the permanent magnet is provided on the rotor and includes detection means for detecting the temperature of the permanent magnet. The rotor is disposed on the rotor rotating shaft side and has a plurality of protrusions on the outer peripheral side. And an outer periphery having an inner periphery-side rotating portion made of a magnetic material, a stator disposed on the outer periphery side of the inner periphery-side rotating portion, facing the stator, rotating with the rotor rotating shaft, and having a permanent magnet and a coil through which magnetic flux passes. And a magnetic flux amount changing means that integrally rotates the inner peripheral side rotating unit and the rotor rotating shaft according to the detected temperature, and passes the coil from the permanent magnet of the outer peripheral side rotating unit. Is in a fixed state, and the inner peripheral side rotating part is separated from the rotor rotating shaft, and the outer peripheral side rotating part and the inner peripheral side rotating part are relatively rotated to pass through the coil of the outer peripheral side rotating part. Magnetic flux changes and electromagnetic induction causes the coil to move Heated thereby is preferably relative rotation state where the permanent magnets are heated, a switching unit for switching between the.

  Further, in the rotating electrical machine according to the present invention, the permanent magnet is provided on the rotor and includes detection means for detecting the temperature of the permanent magnet. The rotor is disposed on the rotor rotating shaft side, has a coil through which the magnetic flux passes, Including an inner peripheral side rotating part constituted by a body and an outer peripheral side rotating part which is arranged to face the stator on the outer peripheral side of the inner peripheral side rotating part and rotates together with the rotor rotating shaft and has a permanent magnet. According to the detected temperature, the changing means integrally rotates the inner peripheral side rotating part and the rotor rotating shaft, and the integrated rotating state in which the magnetic flux passing through the coil from the permanent magnet of the outer peripheral side rotating part is constant. And the inner peripheral side rotating part is separated from the rotor rotating shaft and the outer peripheral side rotating part and the inner peripheral side rotating part are relatively rotated, and a change in magnetic flux passing through the coil of the inner peripheral rotating part occurs, and the coil is generated by electromagnetic induction. Generates heat and the permanent magnet Relative rotation condition heated, is preferably a switching unit for switching between the.

  Further, in the rotating electrical machine according to the present invention, the permanent magnet is provided in the rotor, and the magnetic flux amount changing means is provided in a slot in which the permanent magnet of the rotor is arranged, and expands and contracts according to the temperature of the permanent magnet and It is preferable that the heat expansion / contraction member changes the position of the permanent magnet.

  In the rotating electrical machine according to the present invention, the permanent magnet is provided on the rotor and includes detection means for detecting the temperature of the permanent magnet, and the stator has an inner peripheral side shape that is inclined along the axial direction of the rotor rotating shaft. The rotor has an outer peripheral side shape that is inclined along the axial direction of the rotor rotation axis, corresponding to the inner peripheral side shape of the stator, and the magnetic flux amount changing means changes the rotor according to the detected temperature. It is preferable to move along the axial direction of the rotor rotation shaft to change the facing area between the stator and the rotor.

  With the above configuration, the rotating electrical machine is provided with a permanent magnet in either the stator or the rotor, and changes the amount of magnetic flux of the stator or the rotor in which the permanent magnet is provided according to the temperature of the permanent magnet. Therefore, regarding the fact that the magnetic field generated by the permanent magnet becomes strong at low temperatures, the amount of magnetic flux of the stator or rotor provided with the permanent magnet can be changed to suppress an increase in induced back electromotive force due to the temperature of the permanent magnet. .

  Further, in the rotating electrical machine, when the permanent magnet is provided on the rotor, the rotor is divided into an inner peripheral side rotating portion having a plurality of protrusions on the outer peripheral side and an outer peripheral side rotating portion having a coil through which the permanent magnet and magnetic flux pass. Separately configured to detect the temperature of the permanent magnet, and in accordance with the detected temperature, an integrated rotation state in which the inner peripheral side rotation part and the rotor rotation shaft are integrated and rotated, and from the rotor rotation shaft to the inner periphery side The rotating part is separated and the outer peripheral side rotating part and the inner peripheral side rotating part are rotated relative to each other, and a change in magnetic flux passing through the coil of the outer peripheral side rotating part is generated, and the coil is heated by electromagnetic induction, thereby heating the permanent magnet. Switch between relative rotation states. As a result, when the permanent magnet is at a low temperature and the magnetic field generated is strong, the permanent magnet is heated as a relative rotational state, suppressing the strength of the magnetic field generated by the permanent magnet, and increasing the induced back electromotive force. Can be suppressed.

  Further, in the rotating electrical machine, when the permanent magnet is provided on the rotor, the rotor is divided into an inner peripheral side rotating part having a coil for passing magnetic flux and an outer peripheral side rotating part having a permanent magnet, and the temperature of the permanent magnet In an integrated rotation state in which the inner peripheral side rotating part and the rotor rotating shaft are rotated integrally according to the detected temperature, and the outer peripheral side rotating part by separating the inner peripheral side rotating part from the rotor rotating shaft. Relative rotation state in which the inner peripheral side rotating portion is relatively rotated, the magnetic flux passing through the coil of the inner peripheral side rotating portion is changed, the coil generates heat by electromagnetic induction, and thereby the permanent magnet is heated. Switch between them. As a result, when the permanent magnet is at a low temperature and the magnetic field generated is strong, the permanent magnet is heated as a relative rotational state, suppressing the strength of the magnetic field generated by the permanent magnet, and increasing the induced back electromotive force. Can be suppressed.

  Further, in a rotating electrical machine, when a permanent magnet is provided on a rotor, a thermal expansion / contraction member that expands and contracts in accordance with the temperature of the permanent magnet in a slot in which the permanent magnet of the rotor is arranged to change the position of the permanent magnet in the radial direction of the rotor Is provided. As a result, when the permanent magnet is at a low temperature and the generated magnetic field is strong, the thermal expansion / contraction member can move the permanent magnet in the direction away from the stator side, thereby reducing the amount of magnetic flux of the rotor provided with the permanent magnet. Thus, an increase in induced counter electromotive force can be suppressed.

  In the rotating electrical machine, when a permanent magnet is provided on the rotor, the stator has an inner peripheral shape that is inclined along the axial direction of the rotor rotation shaft, and the rotor corresponds to the inner peripheral shape of the stator. The outer peripheral shape is inclined along the axial direction of the rotor rotating shaft, the temperature of the permanent magnet is detected, and the rotor is moved along the axial direction of the rotor rotating shaft according to the detected temperature. The opposing area between the stator and the rotor is changed. Accordingly, when the permanent magnet is at a low temperature and the generated magnetic field is strong, the amount of magnetic flux directed from the rotor provided with the permanent magnet to the stator can be reduced to suppress an increase in the induced back electromotive force.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, a rotary electric machine having a type in which a permanent magnet is provided on the rotor side will be described, but a type in which a permanent magnet is provided on the stator side may be used. In addition, the number of permanent magnets, the arrangement position, and the like described below are examples for explanation, and can be appropriately changed according to the application of the rotating electrical machine.

  In the following, similar elements are denoted by the same reference symbols in all the drawings, and redundant description is omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram showing a configuration of rotating electrical machines 10 and 11 that have a temperature detection means 29 and can change the amount of magnetic flux of the rotor 20 in accordance with the detected temperature. In FIG. 1, the state at room temperature on the upper side is a state of the rotating electrical machine 10, and the state at a lower temperature is shown as the rotating electrical machine 10, and a sectional view is provided on the left side and a permanent magnet 34 is provided on the right side. A side view of the resulting rotor is shown.

  The rotating electrical machines 10 and 11 are distinguished when the temperature states are different, and the elements constituting the same are the same. Therefore, first, the configuration of the rotating electrical machine 10 at room temperature will be described using the upper part of FIG. 1, and then the temperature of the rotating electrical machine 11 including the state of the rotating electrical machine 11 at a low temperature shown in the lower part of FIG. We will describe how these factors change in response to changes.

  The rotating electrical machine 10 includes a housing 12, a stator 14, a rotor rotating shaft 18, a rotor 20, a temperature detecting means 29, and an electromagnet 30 that operates according to the temperature detected by the temperature detecting means 29. Is done. Here, the rotor 20 is divided into an outer peripheral side rotating part 22 and an inner peripheral side rotating part 24, and a permanent magnet 34 and a coil 36 used for electromagnetic induction described later are provided on the outer peripheral side rotating part 22.

  The housing 12 is a case body of the rotating electrical machine 10 and has a function of supporting the rotor rotating shaft 18 rotatably with the stator 14 fixedly attached. As the casing 12, for example, an appropriate metal material formed into a desired shape and processed can be used.

  The stator 14 is a stator of the rotating electrical machine 10 and includes a magnetic core and a plurality of stator coils 16 wound around the core. As the core, for example, a laminate obtained by punching electromagnetic steel sheets into a desired shape can be used.

  The stator coil 16 is a coil that is wound around the core of the stator 14 and generates a magnetic field by passing an electric current. A number corresponding to the specifications of the rotating electrical machine 10 is arranged in the circumferential direction of the stator 14. For example, in the case of a three-phase, twelve-pole rotating electric machine, a total of twelve poles of the stator coil 16 are arranged on each of the three phases U phase, V phase, and W phase. As the stator coil 16, a conductor wire coated with an insulating coating, which is wound in a ring shape a plurality of times, or the like can be used.

  The stator coil 16 is connected to an inverter (not shown), and in the above example, drive signals having a phase difference of 120 ° are supplied to the three phases U phase, V phase, and W phase, respectively. Is done. Thereby, a rotating magnetic field can be generated in the circumferential direction of the stator 14. Note that the inverter is an AC / DC conversion circuit, and includes a plurality of high-power switching elements such as IGBTs (Insulated Gate Bipolar Transistors) and a plurality of diodes.

  The rotor rotating shaft 18 is an output shaft to which a rotor 20 that is a rotor of the rotating electrical machine 10 is attached and that extracts torque due to rotation of the rotor 20 driven by a drive signal of the stator 14. The rotor rotation shaft 18 can be rotated by being connected to a rotation load such as an axle of a vehicle, for example.

  Here, the rotor 20 is configured by being divided into an outer peripheral side rotating part 22 disposed facing the stator 14 and an inner peripheral side rotating part 24 disposed on the rotor rotating shaft 18 side. Since the outer periphery side rotation part 22 is connected with the rotor rotating shaft 18 by the end plate 26, when the rotor rotating shaft 18 rotates, it rotates according to it. The inner peripheral side rotation unit 24 can rotate integrally with the rotor rotation shaft 18, or can be separated from the rotor rotation shaft 18 and fixed to the housing 12.

  As described above, the outer peripheral side rotating portion 22 is a member that is disposed to face the stator 14 on the outer peripheral side of the inner peripheral side rotating portion 24 and can rotate together with the rotor rotating shaft 18 via the end plate 26. A side view of the rotor 20 from which the end plate 26 is omitted is shown on the right side of the upper stage of FIG. 1, but the outer peripheral side rotating part 22 is used for electromagnetic induction heating through a permanent magnet 34 and a magnetic flux described later. It is illustrated as an annular member on which the coil 36 is disposed.

  As the outer peripheral side rotating part 22, a magnetic steel sheet is punched into a predetermined shape, a plurality of these are laminated to form a core, a permanent magnet 34 is disposed in a through hole provided in the core, and a coil 36 is disposed on the iron core window. What was wound can be used.

  The end plate 26 attached to the outer peripheral side rotating portion 22 is an annular end plate having a function of preventing the laminated electric steel plates from being separated and preventing the permanent magnet 34 from jumping out of the through hole. The end plate 26 is fixedly attached to the rotor rotating shaft 18 on the inner peripheral side thereof. As a result, the outer peripheral side rotation unit 22 rotates according to the rotation of the rotor rotation shaft 18 and stops according to the rotation of the rotor rotation shaft 18. The end plate 26 can be made of a nonmagnetic material having an appropriate strength.

  In addition, since the inner peripheral side rotation part 24 of the rotor 20 may move in the axial direction of the rotor rotating shaft 18, the shape of the inner peripheral side of the end plate 26 is formed so as not to prevent this movement. Further, in FIG. 1, the end plate 26 is illustrated so as to be disposed only on one end face among the end faces on both sides along the axial direction of the outer peripheral side rotating part 22. By providing an annular ring on the outermost periphery and fixing the end plate to the annular ring, the end plates can be provided on both end faces of the outer peripheral side rotating portion 22.

  The permanent magnets 34 arranged along the circumferential direction of the outer peripheral side rotating part 22 are means for generating a magnetic flux, and the rotor 20 is produced by the cooperation of the magnetic flux and the drive current that flows through the stator coil 16 of the stator 14. Rotational force can be generated. In the example of FIG. 1, eight permanent magnets 34 are arranged as an eight-pole configuration. As described above, these permanent magnets 34 are arranged by being inserted into through-holes that are opened in the axial direction in the outer peripheral side rotating portion 22, that is, in the direction parallel to the axial direction of the rotor rotating shaft 18. As such a permanent magnet, for example, a ceramic magnet such as a neodymium magnet can be used.

  The coil 36 disposed along the circumferential direction of the outer peripheral side rotating portion 22 is a winding that passes the magnetic flux of the permanent magnet 34 and is an isolated coil to which both terminals are connected. It has a function to warm up. The contents of heat generation by electromagnetic induction will be described in detail later.

  One coil 36 is arranged in correspondence with each of the eight permanent magnets 34 in the outer peripheral side rotating section 22, and is arranged on the inner peripheral side of the arrangement position of the corresponding permanent magnet 34. As described above, the coil 36 passes through the core wire provided in the core of the outer peripheral side rotating portion 22, that is, the opening formed on both sides of the portion corresponding to the iron core, and the insulated wire is passed through the iron core. It can be constituted by winding a plurality of times around a portion extending corresponding to and shorting both terminals. In the example of FIG. 1, the radial direction connecting the permanent magnet 34 and the rotor rotating shaft 18 is the direction in which the portion corresponding to the iron core extends, and the conductive wire is wound around the winding shaft with this direction as the winding shaft. Thus, the coil 36 is formed.

  As described above, the inner peripheral side rotating portion 24 of the rotor 20 is disposed on the rotor rotating shaft 18 side and can rotate together with the rotor rotating shaft 18, and is separated from the rotor rotating shaft 18 and fixed to the housing 12. A member that can also be made. As shown in the right side view of FIG. 1, the inner peripheral side rotating portion 24 has a plurality of protrusions 25 on the outer peripheral side facing the outer peripheral side rotating portion 22. The plurality of protrusions 25 are intended to make it easier for the magnetic flux from the permanent magnets 34 to pass through the inner peripheral side rotating part 24, and correspond to the arrangement of the permanent magnets 34 and the coils 36 of the outer peripheral side rotating part 22. The same number as the number is arranged. In the example of FIG. 1, the number of the permanent magnets 34 and the number of the coils 36 is eight, and therefore the number of the protrusions 25 is eight, that is, arranged every 45 ° along the circumferential direction. As this inner peripheral side rotation part 24, what laminated | stacked multiple sheets which punched the electromagnetic steel plate in the predetermined | prescribed shape can be used.

  The restraint key 28 shown in FIG. 1 restrains the rotation between the inner peripheral side rotating portion 24 and the rotor rotating shaft 18. The inner peripheral side rotating portion 24 and the rotor rotating shaft 18 are provided with the restricting key 28. Corresponding to each, a groove 27 is provided.

  The temperature detection means 29 is a means for detecting the temperature of the rotating electrical machines 10 and 11, particularly the temperature of the permanent magnet 34. For example, the temperature detecting means 29 is a sensor for detecting the outside air temperature θ that is the temperature of the environment where the rotating electrical machines 10 and 11 are placed. is there. Instead of detecting the outside air temperature, it is more accurate to detect the temperature inside the rotating electrical machines 10 and 11. In the case of detecting the outside air temperature, it is preferable that a correlation with the temperature of the permanent magnet 34 is determined in advance. In addition to the temperature sensor, a device that can indirectly detect the temperature state of the permanent magnet 34 can be used as the temperature detection means 29. For example, the counter electromotive voltage generated in the stator coil 16 of the stator 14 may be normalized by the number of rotations of the rotor 20 and used as a value corresponding to the temperature of the permanent magnet 34.

  The electromagnet 30 operates according to the detection result of the temperature detection means 29, and has a function of attracting the inner peripheral side rotating portion 24 of the rotor 20 and moving it in the axial direction by the operation. The spring 32 is a biasing unit that applies a biasing force that resists the attractive force of the electromagnet 30 to the inner circumferential side rotating portion 24 of the rotor 20. When the electromagnet 30 is not in operation, the urging force of the spring 32 is set to zero, and the inner peripheral side rotating portion 24 of the rotor 20 is set to an initial position along the axial direction of the rotor rotating shaft 18. When the electromagnet 30 is actuated, the inner peripheral side rotating part 24 of the rotor 20 moves along the axial direction of the rotor rotating shaft 18 against the biasing force of the spring 32. When the operation of the electromagnet 30 is stopped, the inner circumferential side rotating portion 24 of the rotor 20 is automatically returned to the initial position by the biasing force of the spring 32.

Specifically, it is determined by a control unit (not shown) whether or not the outside air temperature θ detected by the temperature detecting means 29 is equal to or lower than a preset threshold temperature θ ₀ . When it is determined that the temperature is equal to or lower than the threshold temperature θ ₀ , the electromagnet 30 is energized, and the inner circumferential side rotating portion 24 of the rotor 20 is electromagnet along the axial direction of the rotor rotating shaft 18 against the biasing force of the spring 32. It moves to the side of 30 and is fixed to the housing 12 by the attractive force of the electromagnet 30. When it is determined that the detected temperature θ of the temperature detecting means 29 has exceeded the threshold temperature θ ₀ , the energization of the electromagnet 30 is stopped, and the urging force of the spring 32 automatically causes the inner peripheral side rotating portion 24 of the rotor 20 to be in the initial position. Returned to

  As described above, the electromagnet 30 and the spring 32 are actuators that operate according to the detection result of the temperature detection unit 29 and have a function of attracting and moving the inner peripheral side rotating portion 24 of the rotor 20 in the axial direction by the operation. . The actuator having such a function may have a configuration other than the electromagnet 30 and the spring 32. For example, it is good also as what moves according to the detection result of the temperature detection means 29 using an appropriate plunger, presses the inner peripheral side rotation part 24 of the rotor 20, and moves to an axial direction. Moreover, it is good also as what operate | moves according to the detection result of the temperature detection means 29 using a suitable vacuum suction apparatus, and attracts and moves the inner peripheral side rotation part 24 of the rotor 20 to an axial direction by the action | operation. Further, instead of using the temperature detection means, a member that deforms according to temperature, such as bimetal, may be used to move the inner peripheral side rotating portion 24 of the rotor 20 in the axial direction of the rotor rotating shaft 18.

  Next, the operation of the above configuration, particularly how each element operates according to the temperature change, has been described in relation to the lower part of FIG. 1, FIG. 2, which is a partially enlarged view of FIG. This will be described with reference to FIG. 3 which is a flowchart showing the processing procedure of the control unit.

Here, the description proceeds according to the flowchart of FIG. First, when the rotating electrical machine (MG) is started (S10), the outside air temperature θ is detected by the temperature detecting means 29. Then, it compared with the threshold temperature theta ₀ set in advance, whether or not the detected temperature is a threshold temperature theta ₀ or less or not (S12). If the determination in S12 is affirmed, the process proceeds to S14, and the rotational speed of the rotating electrical machine is acquired. Then, it is compared with a preset threshold rotational speed N ₀ to determine whether the acquired rotational speed is equal to or higher than the threshold rotational speed (S14).

Since the determination of S12 and S14 is for determining whether the induced counter electromotive force in the stator 14 is excessive, the setting of the threshold temperature θ ₀ and the threshold rotation speed N ₀ is related to each other. The threshold temperature θ ₀ can be set in consideration of the material characteristics of the permanent magnet 34, the inductance of the stator coil 16, the withstand voltage characteristics of the inverter elements, and the like. As the threshold rotational speed N ₀ , when the specifications of the rotating electrical machine are roughly classified as a low speed rotational speed, a medium speed rotational speed, and a high speed rotational speed, the value of the high speed rotational speed can be used. For example, the threshold temperature θ ₀ can be set to about −30 ° C., and the threshold rotation speed N ₀ can be set to about 5000 rpm.

  If the determination of either S12 or S14 is negative, the process returns to S10 or S12 again, and the above procedure is repeated. If the determinations in S12 and S14 are both affirmed, in S16, the rotation of the inner peripheral side rotating portion 24 of the rotor 20 is restricted (S16). Specifically, an energization command is issued to the electromagnet 30. As a result, the inner peripheral rotating portion 24 of the rotor 20 slides toward the electromagnet 30 along the axial direction of the rotor rotating shaft 18 against the biasing force of the spring 32 by the attractive force of the electromagnet 30. At this time, the restricting key 28 is removed from the groove 27, and thereby the inner peripheral side rotating part 24 of the rotor 20 is separated from the rotor rotating shaft 18 with respect to the rotation. Therefore, regardless of the rotation of the rotor rotation shaft 18, the rotor inner circumferential side rotation unit 24 is fixed to the housing 12 by the attractive force of the electromagnet 30 and does not rotate. At this time, the outer peripheral side rotating portion 22 of the rotor 20 rotates together with the rotor rotating shaft 18 via the end plate 26.

  As described above, in the state before S16, the restraint key 28 engages with the groove 27, and the inner peripheral side rotating portion 24 of the rotor 20 rotates integrally with the rotor rotating shaft 18, and the outer peripheral side rotation of the rotor 20 also occurs. The part 22 also rotates integrally with the rotor rotating shaft 18 via the end plate 26. This can be called an integrated rotation state. On the other hand, after S <b> 16, the restraint key 28 is separated from the groove 27, and the inner peripheral side rotating portion 24 of the rotor 20 is fixed to the casing 12 regardless of the rotation of the rotor rotating shaft 18, while the outer periphery of the rotor 20 is The side rotating portion 22 rotates integrally with the rotor rotating shaft 18 via the end plate 26. That is, in the rotor 20, the outer peripheral side rotating part 22 rotates relative to the inner peripheral side rotating part 24. This can be referred to as a relative rotational state.

  Therefore, the process of S16 can be referred to as a switching process for switching the rotor 20 from the integrated rotation state to the relative rotation state. In that sense, the electromagnet 30 can be referred to as switching means that switches the rotor 20 between an integrated rotation state and a relative rotation state. The processing of S12, S14, and S16 is executed by the function of the control unit that performs processing related to the temperature detection unit 29 and the electromagnet 30.

  A state of the rotating electrical machine 11 in which the rotor 20 is in a relative rotation state is illustrated in the lower part of FIG. Here, the electromagnet 30 is energized, and the inner circumferential side rotation part 24 of the rotor 20 moves along the rotor rotation shaft 18 to the electromagnet 30 side in the direction of the arrow. A state of coming off from the groove 27 is shown.

  The upper part of FIG. 1 shows a state in which the rotor 20 is in an integrally rotated state. Here, the eight protrusions 25 of the inner peripheral side rotating part 24 of the rotor 20 and the eight of the outer peripheral side rotating part 22 are shown. One coil 36 and eight permanent magnets 34 are arranged in a straight line passing through the center point of the rotor rotating shaft 18. Therefore, the state of the magnetic flux passing through the coil 36 is not changed by the rotation of the rotor rotating shaft 18 and is always constant.

  This is shown in the diagram on the left side of FIG. Here, most of the magnetic flux 38 from the permanent magnet 34 passes through the protrusion 25 of the inner peripheral rotation part 24 of the rotor 20, passes through the inner rotation part 24, and is again adjacent to the protrusion 25. To return to the adjacent permanent magnet 34. Since the coil 36 is located on a straight line connecting the permanent magnet 34 and the protrusion 25, most of the magnetic flux 38 from the permanent magnet 34 passes through the coil 36. However, since the outer periphery side rotation part 22 and the inner periphery side rotation part 24 are in an integrated rotation state, the temporal change of the magnetic flux passing through the coil 36 does not occur.

  The lower part of FIG. 1 shows a state at a certain moment of relative rotation. Here, the eight protrusions 25 of the inner peripheral side rotating portion 24 of the rotor 20, the eight coils 36 of the outer peripheral side rotating portion 22, and the eight permanent magnets 34 are linear shapes that pass through the center point of the rotor rotating shaft 18. Not lined up. Such a discrepancy is an example, and the outer peripheral side rotating part 22 rotates relative to the inner peripheral side rotating part 24, so the position of the protrusion 25 of the inner peripheral side rotating part 24 and the outer peripheral side rotating part 22. The discrepancy between the permanent magnet 34 and the position of the permanent magnet 34 fluctuates periodically. Therefore, the state of the magnetic flux passing through the coil 36 varies depending on the rotation of the rotor rotating shaft 18.

  The state of the magnetic flux passing through the coil 36 fluctuates due to the rotation of the rotor rotating shaft 18, and happens to coincide with the position of the protrusion 25 of the inner peripheral side rotating part 24 coincident with the position of the permanent magnet 34 of the outer peripheral side rotating part 22. The state on the left side of FIG. 2 is reached, and most of the magnetic flux 38 from the permanent magnet 34 passes through the coil 36. On the other hand, an example of a state when the position of the protrusion 25 of the inner peripheral side rotating part 24 is different from the position of the permanent magnet 34 of the outer peripheral side rotating part 22 is shown in the right side of FIG. Here, since the magnetic flux 39 from the permanent magnet 34 flows through the core of the outer peripheral side rotating portion 22 rather than flowing through the protrusion 25 of the inner peripheral side rotating portion 24, the magnetic resistance 39 is smaller. The passing magnetic flux is low.

  Thus, in the relative rotation state, the magnetic flux passing through the coil 36 varies with time. When there is a temporal change in the magnetic flux passing through the coil 36, a current flows through the coil 36 and heat is generated by the resistance component of the coil 36. This phenomenon is called induction heating. In the integrated rotation state, there is no temporal change in the magnetic flux passing through the coil 36, so that the induction heating phenomenon does not occur.

  Returning to FIG. 3 again, when the rotation restraining process inside the rotor is performed in S16, an induction heating phenomenon occurs in the coil 36 as described above (S18), and the coil 36 generates heat, which causes the permanent magnet 34 to move. Heat transfer is performed (S20), and the temperature of the permanent magnet 34 rises. When the temperature of the permanent magnet 34 rises, the magnetic field generated by the permanent magnet 34 becomes weak, and the back electromotive force in the stator coil 16 of the stator 14 is reduced (S22). Thus, according to the said structure, the increase in the induced counter electromotive force by low temperature of the permanent magnet 34 can be suppressed.

  In the above description, both the permanent magnet and the induction heating coil are provided on the outer peripheral side rotating portion of the rotor, but the induction heating coil may be provided on the inner peripheral side rotating portion of the rotor. 4 and 5 are diagrams for explaining the state of the rotating electrical machines 40 and 41 having such a configuration. 4 is a diagram corresponding to FIG. 1, and FIG. 5 is a diagram corresponding to FIG. Here, the state at room temperature is indicated by the rotating electrical machine 40, and the state at a low temperature is indicated by the rotating electrical machine 41.

  As in the case of FIG. 1, the configuration of the rotating electrical machine 40 at room temperature will be described first. The rotating electrical machine 40 is different from the rotating electrical machine 10 of FIG. That is, the contents of the casing 12, the stator 14, the stator coil 16, the rotor rotating shaft 18, the end plate 26, the groove 27, the restraint key 28, the temperature detecting means 29, the electromagnet 30, and the spring 32 are described with reference to FIG. Is the same as Here, the rotor 42 is composed of an outer peripheral side rotating part 44 and an inner peripheral side rotating part 46. The outer peripheral side rotating part 44 is provided with a permanent magnet 48, and the induction heating coil 50 is provided on the inner peripheral side. Provided in the rotating unit 46.

  Therefore, the outer peripheral side rotating portion 44 can be formed by punching an electromagnetic steel sheet into a predetermined shape, laminating a plurality of them into a core, and arranging a permanent magnet 48 in a through hole provided in the core. The contents of the permanent magnet 48 are the same as those of the permanent magnet 34 described in FIG.

  Unlike the inner peripheral side rotating part 24 of FIG. 1, the inner peripheral side rotating part 46 is not provided with a protrusion on the outer peripheral side thereof. However, although a protrusion can be provided in some cases, a case where no protrusion is provided will be described below. An electromagnetic induction coil 50 is provided in the inner peripheral side rotation unit 46. As the inner peripheral side rotating part 24, a core obtained by stacking a plurality of electromagnetic steel sheets punched into a predetermined shape is used as a core, and a coil 50 wound around an iron core window provided in the core is used. it can.

  The coil 50 is a winding through which the magnetic flux of the permanent magnet 48 passes, as in the coil 36 of FIG. 1, and is an isolated coil to which both terminals are connected. Corresponding one by one. This coil 50 is a core window provided in the core of the inner peripheral side rotation part 46, that is, a lead wire insulated and passed through openings opened on both sides of a portion extending corresponding to the iron core, and corresponds to the iron core. It can be configured by winding a plurality of times around the extending portion and shorting both terminals. In the example of FIG. 4, the circumferential direction orthogonal to the radial direction connecting the permanent magnet 34 and the rotor rotating shaft 18 is the direction in which the portion corresponding to the iron core extends, and this direction is taken as the winding axis and around the winding axis. A conducting wire is wound to form the coil 50. That is, the winding direction of the coil 50 is different from that of the coil 36 of FIG.

The operation of the above configuration can also be described according to the flowchart of FIG. That is, the rotary electric machine (MG) is started and (S10), and compared the outside air temperature theta detected by the temperature detecting means 29 and the threshold temperature theta _0, whether or not the detected temperature is a threshold temperature theta ₀ or less is determined (S12). If S12 in judgment is affirmative, the process proceeds to S14, and compares the rotation speed of the rotary electric machine is obtained a threshold rotational speed N _0, whether the acquired speed is above the threshold speed is determined (S14). If the determinations in S12 and S14 are both affirmed, in S16, the rotation of the inner circumferential side rotation portion 46 of the rotor 42 is restricted (S16). Specifically, an energization command is issued to the electromagnet 30 and the rotor 42 is switched from the integrated rotation state to the relative rotation state.

  The lower part of FIG. 4 shows a state of the rotating electrical machine 41 in which the rotor 42 is in a relative rotation state. Here, the electromagnet 30 is energized, and the inner circumferential side rotation portion 46 of the rotor 42 moves along the rotor rotation shaft 18 to the electromagnet 30 side in the direction of the arrow, and the restraint key 28 is moved accordingly. A state of coming off from the groove 27 is shown.

  4 shows a state in which the rotor 42 is in an integrally rotated state. Here, the eight coils 50 of the inner peripheral side rotating portion 46 of the rotor 42 and the eight coils of the outer peripheral side rotating portion 44 are shown. The permanent magnet 34 rotates integrally with the relative positional relationship fixed. Therefore, the state of the magnetic flux passing through the coil 50 is not changed by the rotation of the rotor rotating shaft 18 and is always constant.

  This is shown in the diagram on the left side of FIG. Here, most of the magnetic flux 52 from the permanent magnet 48 passes through the inner peripheral side rotating portion 46 of the rotor 20 and returns to the adjacent permanent magnet 48 again. Since the coil 50 is disposed at an intermediate position between the adjacent permanent magnets 48, much of the magnetic flux 52 from the permanent magnet 48 passes through the coil 50. However, since the outer periphery side rotation part 44 and the inner periphery side rotation part 46 are in an integrated rotation state, the temporal change of the magnetic flux passing through the coil 50 does not occur.

  The lower part of FIG. 4 shows a state at a certain moment of relative rotation. Here, the eight coils 50 of the inner peripheral side rotation part 46 of the rotor 42 and the eight permanent magnets 48 of the outer peripheral side rotation part 44 are periodically cycled relative to each other as the rotor rotation shaft 18 rotates. Change. Therefore, the state of the magnetic flux passing through the coil 50 varies depending on the rotation of the rotor rotating shaft 18.

  The state of the magnetic flux passing through the coil 50 varies depending on the rotation of the rotor rotating shaft 18, and it happens that the position of the coil 50 of the inner peripheral side rotating part 46 is just an intermediate position between the adjacent permanent magnets 48 in the outer peripheral side rotating part 22. 5, the state on the left side of FIG. 5 is reached, and most of the magnetic flux 52 from the permanent magnet 48 passes through the coil 50. On the other hand, an example of a state when the position of the coil 50 of the inner peripheral side rotation part 46 is shifted from the intermediate position of the adjacent permanent magnet 48 of the outer periphery side rotation part 44 is shown in the right side of FIG. . Here, since the magnetic flux 53 from the permanent magnet 48 flows through the coil 50 because the magnetic flux 53 flowing through the core of the outer peripheral rotating portion 22 is smaller than the magnetic flux 53 flowing through the inner peripheral rotating portion 46. Magnetic flux is low.

  As described above, also in the configuration of FIG. 4, the magnetic flux passing through the coil 50 varies with time in the relative rotation state. Therefore, a current flows through the coil 36 due to the temporal change of the magnetic flux passing through the coil 36, and heat is generated by the resistance component of the coil 36. That is, as shown in the flowchart of FIG. 3, when the rotation restraining process inside the rotor is performed in S <b> 16, an induction heating phenomenon occurs in the coil 50 (S <b> 18), and the coil 50 generates heat, thereby causing the permanent magnet 48. Is heated by heat transfer (S20), and the temperature of the permanent magnet 48 rises. When the temperature of the permanent magnet 48 rises, the magnetic field generated by the permanent magnet 48 becomes weak, and the back electromotive force in the stator coil 16 of the stator 14 is reduced (S22). Thus, also in the said structure, the increase in the induced back electromotive force by the low temperature of the permanent magnet 48 can be suppressed.

  In the above, the rotor has a double structure in the radial direction, and when the temperature of the permanent magnet becomes low using the temperature detection means, the electromagnet is energized to change the double structure of the rotor from the integrated rotation state to the relative rotation state. The magnetic flux from the permanent magnet passing through the electromagnetic induction coil is changed over time. In addition to this, it is possible to use a configuration in which the distance between the stator coil and the rotor permanent magnet is changed by using a member that expands and contracts depending on the temperature, and the amount of magnetic flux from the rotor is changed. According to this configuration, there is no need for the rotor to have a double structure, and there is no need for a temperature detection means or an actuator such as an electromagnet that is operated by the temperature detection means.

  FIG. 6 is a diagram illustrating a configuration of the rotating electrical machines 60 and 61 using the thermal expansion / contraction member 66 that expands and contracts according to temperature. FIG. 6 is a diagram corresponding to FIG. 1 or FIG. 4, in which a state at a normal temperature is indicated by a rotating electrical machine 60 and a state at a low temperature is indicated by a rotating electrical machine 61.

  As in the case of FIGS. 1 and 4, the configuration of the rotating electrical machine 60 at room temperature will be described first. The rotating electrical machine 60 is different from the rotating electrical machine 10 in FIG. 1 and the rotating electrical machine 40 in FIG. 4 only in the configuration of the rotor 62. That is, the contents of the housing 12, the stator 14, the stator coil 16, and the rotor rotating shaft 18 are the same as those described in FIG. Here, the rotor 62 is provided with a permanent magnet 64, and a heat expansion / contraction member 66 is provided in a through hole in which the permanent magnet 64 is provided.

  The thermal expansion / contraction member 66 is a member made of a material having a large positive coefficient of thermal expansion. For example, a plastic material or the like that has heat resistance, expands at a high temperature, contracts at a low temperature, and has a large thermal expansion coefficient can be used. The thermal expansion / contraction member 66 is disposed on the inner peripheral side of the permanent magnet 64 in the through hole into which the permanent magnet 64 is inserted. And the leaf | plate spring 68 as a biasing member is arrange | positioned rather than the permanent magnet 64 in the through-hole (refer FIG. 7). That is, in the through hole penetrating along the axial direction of the rotor 62, the thermal expansion / contraction member 66 is disposed on the inner peripheral side and the leaf spring 68 is disposed on the outer peripheral side with the permanent magnet 64 as the center.

  The thickness of the thermal expansion / contraction member 66 is set to a value obtained by subtracting the radial thickness of the permanent magnet 64 and the plate thickness of the leaf spring 68 from the opening size in the radial direction of the through-hole at room temperature, or a thickness slightly smaller than this. The In other words, at a normal temperature, the heat expansion / contraction member 66 is in an expanded state as compared with a low temperature, and the permanent magnet 64 is pressed against the outer peripheral side of the through hole against the urging force of the leaf spring 68. By doing in this way, the permanent magnet 64 is brought close to the outer peripheral side of a through-hole at normal temperature. In the upper diagram of FIG. 6, the distance between the stator 14 and the permanent magnet 64 at room temperature is indicated as d1.

  Next, the low temperature state will be described with reference to the lower diagram of FIG. 6 and FIG. 7 which is a partially enlarged view thereof. These show a thermal expansion / contraction member 67 that has shrunk at a low temperature and has a reduced thickness. Then, the permanent magnet 64 is moved by the leaf spring 68 in the direction of the arrow shown in the lower diagram of FIG. In the lower diagram of FIG. 6, the distance between the stator 14 and the permanent magnet 64 at a low temperature is shown as d2. d2-d1 corresponds to a value obtained by subtracting the thickness of the thermal expansion / contraction member 67 at a low temperature from the thickness of the thermal expansion / contraction member 66 at a normal temperature. FIG. 7 shows a state in which the permanent magnet 64 is pressed against the heat expansion / contraction member 66 side by the urging force of the leaf spring 68 and is moved toward the inner peripheral side of the rotor 62.

  FIG. 8 shows a plan view and a cross-sectional view of the leaf spring 68. The plate spring 68 is formed by cutting a plurality of U-shaped or U-shaped cuts into a plate material 70 made of an elastic material, and raising the cut portions from the plate material 70 to form a plurality of cantilever plate springs 72. , 73 are formed. As the plate member 70, a metal thin plate or a heat-resistant plastic thin plate can be used.

  In this manner, the distance between the stator 14 and the permanent magnet 64 can be changed from d1 at normal temperature to d2 having a value larger than d1 at low temperature. As a result, the amount of magnetic flux supplied to the stator 14 by the magnetic field generated by the permanent magnets 64 at a low temperature can be suppressed as compared with the state where the distance d1 remains unchanged. An increase in induced counter electromotive force can be suppressed.

  The operation can be explained in time series by the flowchart of FIG. That is, depending on whether or not the outside air temperature has dropped from room temperature (S30), when it falls from room temperature, it becomes a time-series state change after S32, and when it is at room temperature, it becomes a time-series state change after S33.

  In S30, when it is assumed that the outside air temperature has decreased, the heat expansion / contraction member 66 at room temperature is contracted from the temperature to decrease the thickness, resulting in the heat expansion / contraction member 67 having a reduced thickness (S32). Thereby, the position of the permanent magnet 64 is moved to the inner peripheral side of the rotor 62 by the biasing force of the leaf spring 68. That is, as described above, the distance between the stator 14 and the permanent magnet 64 is d2 larger than d1 from d1 at room temperature. Under the low temperature, the rotating electrical machine 61 is started in this state (S36). Accordingly, the amount of magnetic flux supplied from the permanent magnet 64 of the rotor 62 to the stator 14 is reduced compared to the distance d1 between the stator 14 and the permanent magnet 64 when the heat expansion / contraction member is not used, and the stator of the stator 14 The interlinkage magnetic flux in the coil 16 is reduced (S38), and the induced back electromotive force in the stator coil 16 is reduced (S40).

  On the other hand, when the outside air temperature is not lowered in S30, the heat expansion / contraction member 66 remains as it is (S33), the thickness does not decrease, and the position of the permanent magnet 64 remains at the normal position (S35). The distance between the permanent magnet 64 remains d1. The rotating electrical machine 60 is started in this state at room temperature (S37). Therefore, the amount of magnetic flux supplied from the permanent magnet 64 of the rotor 62 to the stator 14 is as designed, the interlinkage magnetic flux in the stator coil 16 of the stator 14 remains at the normal value as designed (S39), and the stator coil 16 The induced back electromotive force at is also a normal value as designed (S41).

  In the above description, it is assumed that the inner diameter of the stator and the outer diameter of the rotor are not changed in size along the axial direction of the rotor rotation shaft. FIG. 10 shows that the stator has an inner peripheral side shape that is inclined along the axial direction of the rotor rotation axis, and the rotor is inclined along the axial direction of the rotor rotation axis corresponding to the inner peripheral side shape of the stator. It is a figure explaining the structure which can change the magnetic flux amount of a rotor according to the temperature of a permanent magnet in the rotary electric machine which has an outer peripheral side shape. Here, the state at room temperature is indicated by the rotating electrical machine 80 in the left side of FIG. 10, and the state at a low temperature is indicated by the rotating electrical machine 81 in the right side of FIG.

  As in the case of FIG. 1, FIG. 4, and FIG. 6, the configuration of the rotating electrical machine 80 at room temperature will be described first. The rotating electrical machine 70 differs from the rotating electrical machine 10 in FIG. 1 and the rotating electrical machine 40 in FIG. 4 only in the stator 82, the stator coil 84, the rotor 86, the end plate 88, and the permanent magnet 90. is there. That is, the contents of the housing 12, the rotor rotating shaft 18, the temperature detecting means 29, the electromagnet 30, and the spring 32 are the same as those described in FIG.

  Here, the stator 82 has an inner peripheral side shape that is inclined along the axial direction of the rotor rotating shaft 18, and accordingly, the stator coil 84 is also inclined and disposed along the axial direction of the rotor rotating shaft 18. The rotor 86 has an outer peripheral side shape that is inclined along the axial direction of the rotor rotation shaft 18 corresponding to the inner peripheral side shape of the stator 82, and the shape of the end plate 88 is also rotated accordingly. The shapes of both ends of the shaft 18 in the axial direction are different from each other, and the permanent magnet 90 is also inclined and disposed along the axial direction of the rotor rotation shaft 18. In addition, the inclination is set so that the side on which the electromagnet 30 is provided is large and the opposite side is small when the inner peripheral side shape of the rotor 86 is described.

Next, a state at a low temperature will be described with reference to the right side of FIG. Here, similarly to S10, S12, and S14 in the flowchart of FIG. 3, when the rotating electrical machine (MG) is started, the outside air temperature θ detected by the temperature detecting means 29 is compared with the threshold temperature θ ₀ to detect the detected temperature. Is determined to be equal to or lower than the threshold temperature θ ₀ . When the determination is affirmative, compared rotational speed of the rotary electric machine is obtained a threshold rotational speed N _0, whether the acquired speed is above the threshold speed is determined. If this determination is also affirmed, an energization command is next issued to the electromagnet 30. Thus, the rotor 86 moves against the biasing force of the spring 32 in the direction of the arrow shown in the right side of FIG. 10, that is, in the direction of the electromagnet 30, along the axial direction of the rotor rotating shaft 18. It is fixed to the housing 12 by the electromagnet 30.

  The right side of FIG. 10 shows the state of the rotor 87 moved to the electromagnet 30 side at a low temperature. As described above, the rotor 87 moves along the axial direction of the rotor rotation shaft 18 at a low temperature, so that the facing area between the stator 82 and the rotor 87 can be smaller than the facing area at normal temperature. As a result, the amount of magnetic flux supplied from the rotor 87 to the stator 82 can be suppressed compared to that at normal temperature, and an increase in the induced back electromotive force in the stator coil 84 of the stator 82 can be suppressed.

It is a figure explaining the structure of the rotary electric machine in embodiment which concerns on this invention. It is the elements on larger scale of FIG. In embodiment which concerns on this invention, it is a flowchart which shows the process sequence of the control part relevant to an electromagnet. In embodiment which concerns on this invention, it is a figure explaining the structure of another rotary electric machine. It is the elements on larger scale of FIG. In embodiment which concerns on this invention, it is a figure explaining the structure of the rotary electric machine using a heat | fever expansion-contraction member. It is the elements on larger scale of FIG. In embodiment which concerns on this invention, it is a figure explaining the structure of the leaf | plate spring used with a heat | fever expansion-contraction member. In embodiment which concerns on this invention, it is a flowchart which shows the time-sequential change relevant to a thermal expansion-contraction member. In embodiment which concerns on this invention, it is a figure explaining the structure of the rotary electric machine using the stator and rotor which inclined.

Explanation of symbols

  10, 11, 40, 41, 60, 61, 80, 81 Rotating electric machine, 12 Housing, 14, 82 Stator, 16, 84 Stator coil, 18 Rotor rotating shaft, 20, 42, 62, 86, 87 Rotor, 22, 44 Outer peripheral side rotating part, 24, 46 Inner peripheral side rotating part, 25 Protruding part, 26, 88 End plate, 27 Groove, 28 Restraint key, 29 Temperature detecting means, 30 Electromagnet, 32 Spring, 34, 48, 64 , 90 Permanent magnet, 36, 50 Coil, 38, 39, 52, 53 Magnetic flux, 66, 67 Thermal expansion / contraction member, 68 Leaf spring, 70 Plate material, 72, 73 Cantilever leaf spring.

Claims (5)

A permanent magnet provided on either the stator or the rotor;
Magnetic flux amount changing means for changing the magnetic flux amount of the stator or rotor provided with the permanent magnet according to the temperature of the permanent magnet,
A rotating electric machine comprising: In the rotating electrical machine according to claim 1,
The permanent magnet is provided on the rotor,
A detecting means for detecting the temperature of the permanent magnet;
The rotor
An inner peripheral side rotating part that is arranged on the rotor rotating shaft side, has a plurality of protrusions on the outer peripheral side, and is made of a magnetic material;
An outer peripheral side rotating part that is disposed facing the stator on the outer peripheral side of the inner peripheral side rotating part, rotates with the rotor rotating shaft, and has a permanent magnet and a coil that passes magnetic flux;
Including
The magnetic flux amount changing means is
Depending on the detected temperature,
An integrated rotating state in which the inner peripheral side rotating part and the rotor rotating shaft are integrally rotated and the magnetic flux passing through the coil from the permanent magnet of the outer peripheral side rotating part is in a constant state;
The inner peripheral side rotating part is separated from the rotor rotating shaft, the outer peripheral side rotating part and the inner peripheral side rotating part are rotated relatively, and a change in magnetic flux passing through the coil of the outer peripheral side rotating part occurs, and the coil generates heat by electromagnetic induction. Then, the relative rotation state in which the permanent magnet is heated,
A rotating electrical machine characterized in that it is a switching unit that switches between the two. In the rotating electrical machine according to claim 1,
The permanent magnet is provided on the rotor,
A detecting means for detecting the temperature of the permanent magnet;
The rotor
An inner peripheral side rotation unit that is disposed on the rotor rotation axis side, has a coil that passes magnetic flux, and is made of a magnetic material;
An outer peripheral side rotating part that is disposed facing the stator on the outer peripheral side of the inner peripheral side rotating part, rotates with the rotor rotating shaft, and has a permanent magnet;
Including
The magnetic flux amount changing means is
Depending on the detected temperature,
An integrated rotating state in which the inner peripheral side rotating part and the rotor rotating shaft are integrally rotated and the magnetic flux passing through the coil from the permanent magnet of the outer peripheral side rotating part is in a constant state;
The inner peripheral side rotating part is separated from the rotor rotating shaft, the outer peripheral side rotating part and the inner peripheral side rotating part are rotated relatively, and a change in the magnetic flux passing through the coil of the inner peripheral rotating part occurs, and the coil generates heat by electromagnetic induction. Then, the relative rotation state in which the permanent magnet is heated,
A rotating electrical machine characterized in that it is a switching unit that switches between the two. In the rotating electrical machine according to claim 1,
The permanent magnet is provided on the rotor,
The magnetic flux amount changing means is
A rotating electrical machine, characterized in that it is a thermal expansion / contraction member that is provided in a slot in which a permanent magnet of a rotor is arranged and expands and contracts in accordance with the temperature of the permanent magnet to change the position of the permanent magnet in the radial direction of the rotor. In the rotating electrical machine according to claim 1,
The permanent magnet is provided on the rotor,
A detecting means for detecting the temperature of the permanent magnet;
The stator has an inner peripheral side shape that is inclined along the axial direction of the rotor rotation shaft,
The rotor has an outer peripheral side shape that is inclined along the axial direction of the rotor rotation axis, corresponding to the inner peripheral side shape of the stator,
The magnetic flux amount changing means is
A rotating electrical machine that moves a rotor along an axial direction of a rotor rotation shaft in accordance with a detected temperature to change a facing area between the stator and the rotor.

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