JP2017073901A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of driving a DC motor without using a brush nor a commutator.SOLUTION: A rotary electric machine 10 comprises: an inner rotor 11; a first electric motor 31 that has a rotor coil 22 provided in the inner rotor 11, and that serves as a DC motor; and a stator conversion unit 43 that performs a DC/AC conversion operation for converting a storage power of a battery 202 into an AC transmission power having a preliminarily defined frequency. In addition, the rotary electric machine 10 comprises: a non-contact power transmission unit 44 that performs non-contact power transmission via coupling capacitors C1 and C2; and a rotor conversion unit 92 provided in the inner rotor 11, and that performs an AC/DC conversion operation for converting the transmission power into a DC power, and outputs the DC power to the rotor coil 22.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rotating electrical machine.

  The rotating electrical machine includes, for example, a rotor and an electric motor having a rotor coil provided on the rotor (see, for example, Patent Document 1). Japanese Patent Application Laid-Open No. H10-228867 describes that power is supplied to the rotor coil using a slip ring.

JP 2013-215032 A

  Here, in power transmission using a slip ring, there is a concern about wear of the brush. Moreover, when the rotational speed which a slip ring can respond | correspond is predetermined, the rotational speed of a rotary electric machine may be restrict | limited.

  Moreover, there is a direct current drive direct current motor as a kind of electric motor. In order to drive the DC motor, a commutator that switches the power transmission direction is required, and there is a concern that the configuration may be complicated.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a rotating electrical machine capable of driving a DC motor without using a brush or a commutator.

  A rotating electrical machine that achieves the above object includes a rotor, a DC motor having a rotor coil provided in the rotor, and a DC power that converts a DC power source output from a DC power source into an AC power having a predetermined frequency. A first conversion unit that performs an AC conversion operation, a holding electrode that is held so as not to rotate in accordance with the rotation of the rotor and that receives the AC power, and a contact that is provided on the rotor and is not in contact with the holding electrode A non-contact power transmission unit for receiving non-contact power transmission via a coupling capacitor composed of the holding electrode and the rotation electrode, and a rotating electrode for receiving the alternating-current power. A second converter that performs an AC / DC conversion operation for converting AC power received by the rotating electrode into DC power and outputs the DC power to the rotor coil A position grasping unit that grasps the rotational position of the rotor, and the first conversion unit includes a primary side switching element, and the primary side switching element is periodically turned on and off to The second conversion unit has a secondary side switching element, and the secondary side switching element is periodically turned on / off to perform the AC / DC conversion operation. And switching the polarity of the DC power output to the rotor coil according to the delay time of the rise timing of the secondary side switching element with respect to the rise timing of the primary side switching element, The rotating electrical machine includes a control unit that controls the primary side switching element and the secondary side switching element. Both switching elements are periodically turned on and off so that the rising timing of the side switching elements is delayed by a delay time from the rising timing of the primary side switching elements, and based on the grasping result of the position grasping unit By changing the delay time, DC power having a polarity corresponding to the rotational position of the rotor is output from the second conversion unit.

  According to this configuration, non-contact power feeding to the rotor is realized by the non-contact power transmission unit. Thereby, brushless-ization can be achieved. Further, according to this configuration, the delay time is changed according to the rotational position of the rotor, focusing on the fact that the polarity of the DC power output from the second conversion unit is switched according to the delay time. Thereby, the direct-current power of the polarity according to the rotation position of a rotor can be input into a direct-current motor, without providing a commutator. From the above, the DC motor can be driven without providing a brush or a commutator.

  In particular, in this configuration, since a DC motor is employed, it is not necessary to provide an inverter or the like having a switching element between the second conversion unit and the DC motor. Thereby, the configuration of the rotor can be simplified and the number of switching elements can be reduced. In the present specification, DC power means power having a constant power transmission direction, and the DC power includes that whose power value changes periodically.

  For the rotating electrical machine, the control unit has a switching frequency corresponding to the number of rotations of the rotor, the delay time, a positive delay time corresponding to positive DC power, and a negative delay time corresponding to negative DC power. It is preferable to alternately output positive DC power and negative DC power from the second conversion unit to the rotor coil by alternately switching to.

  According to this configuration, positive DC power and negative DC power can be alternately input to the DC motor in accordance with the rotational speed of the rotor. Thereby, rotation of a rotor and the polarity of the direct-current power input into a rotor coil can be synchronized, and a direct-current motor can be rotated suitably. Moreover, the rotation speed of the rotor can be changed by changing the switching frequency.

About the said rotary electric machine, the frequency of the said alternating current power is good to be set higher than the said switching frequency.
According to such a configuration, it is possible to suitably perform non-contact power transmission via the coupling capacitor and drive of the DC motor while suppressing an increase in the size of the non-contact power transmission unit.

  In the rotating electrical machine, the second conversion unit is configured using at least the secondary-side switching element, and includes a bidirectional switch circuit capable of flowing a current bidirectionally, and the bidirectional switch The circuit may be connected in parallel to the rotor coil.

According to this configuration, the polarity of the DC power output from the second conversion unit can be switched by changing the delay time.
In the rotating electrical machine, the primary side switching element is connected in parallel to the DC power source, the secondary side switching element is connected in parallel to the rotor coil, and the first converter is A primary side coil provided between the secondary side switching element and the DC power source and connected in series to the DC power source, and provided between the primary side coil and the coupling capacitor, the primary side switching A primary shunt capacitor connected in parallel to the element, and the second converter is provided between the secondary switching element and the rotor coil, and is connected in series to the rotor coil. A secondary coil, and a secondary shunt capacitor provided between the secondary coil and the coupling capacitor and connected in parallel to the secondary switching element, The rotary electric machine includes a resonance coil that is connected in series with the coupling capacitor and forms a series resonance circuit in cooperation with the coupling capacitor, the series resonance circuit including the primary shunt capacitor and the A class E inverter is configured by the first converter and the series resonant circuit, and a class E converter is configured by the second converter and the series resonant circuit. It is good to be.

  According to such a configuration, since the DC / AC conversion operation and the AC / DC conversion operation are realized by the class E operation, the switching loss of both switching elements can be reduced. Thereby, the efficiency improvement of the electric power transmission from DC power supply to a DC motor can be aimed at.

  Here, in order to realize the class E operation, a series resonance circuit is required. In this regard, according to this configuration, a coupling capacitor that is an essential configuration for performing electric field coupling type non-contact power feeding is employed as a part of the series resonance circuit. The series resonant circuit is used for both the class E inverter and the class E converter. Therefore, the configuration can be simplified.

  According to the present invention, the DC motor can be driven without using a brush or a commutator.

The schematic diagram which shows the outline | summary of a rotary electric machine and a vehicle. Sectional drawing which shows the outline | summary of a non-contact electric power transmission part typically. The circuit diagram which shows the electric constitution of a rotary electric machine. (A) is a time chart which shows the switching mode of both the primary side switching elements in 1 period, (b) is a time chart which shows the switching mode of both the secondary side switching elements in 1 period. The graph which shows the relationship between delay time, the polarity of DC power, and a power value. (A) is a time chart which shows the time change of the rotation angle of an inner rotor, (b) is a time chart which shows the time change of delay time, (c) is the polarity of the direct-current power output from a rotor conversion part. The time chart which shows the time change of. The circuit diagram which shows the rotary electric machine of another example. The circuit diagram which shows the bidirectional | two-way switch circuit of another example. The circuit diagram which shows the bidirectional | two-way switch circuit of another example.

Hereinafter, an embodiment of a rotating electrical machine will be described.
As shown in FIG. 1, the rotating electrical machine 10 of this embodiment is mounted on a vehicle 200 having an engine 201 and a battery (power storage device) 202, and is used for a hybrid transaxle. The battery 202 is a direct current power source, and the stored power of the battery 202 corresponds to “power source power”.

  The rotating electrical machine 10 includes a rotatable inner rotor 11 and an outer rotor 12, and a stator 13 that is held so as not to rotate. For example, the inner rotor 11 is columnar, and the outer rotor 12 and the stator 13 are cylindrical. The rotors 11 and 12 and the stator 13 are arranged concentrically in the order of the inner rotor 11, the outer rotor 12, and the stator 13 from the radially inner side toward the radially outer side.

  The rotating electrical machine 10 includes a housing 14 (see FIG. 2) in which the rotors 11 and 12 and the stator 13 are accommodated. Both rotors 11 and 12 are supported so as to be rotatable with respect to the housing 14, while the stator 13 is fixed to the housing 14. In this case, the inner rotor 11 and the outer rotor 12 are relatively rotatable.

The inner rotor 11 is mechanically connected to the output shaft of the engine 201. The inner rotor 11 rotates when the power of the engine 201 is transmitted.
The inner rotor 11 has a cylindrical inner rotor core 21 and a rotor coil 22 wound around the inner rotor core 21. The rotor coil 22 includes a first coil part 22a and a second coil part 22b connected in series with each other. When the inner rotor 11 rotates, the rotor coil 22 also rotates.

  The outer rotor 12 is mechanically connected to the axle 203 of the vehicle 200. For this reason, the rotational force of the outer rotor 12 is transmitted to the axle 203, and the rotational force of the axle 203 is transmitted to the outer rotor 12.

  The outer rotor 12 includes a cylindrical outer rotor core 23 having an inner peripheral surface facing the outer peripheral surface of the inner rotor core 21, and permanent magnets 24 and 25 embedded in the outer rotor core 23. Both the permanent magnets 24 and 25 are embedded while being displaced in the radial direction. The first permanent magnet 24 embedded inside the permanent magnets 24 and 25 and the inner rotor 11 are opposed to each other.

  The stator 13 includes a cylindrical stator core 26 having an inner peripheral surface facing the outer peripheral surface of the outer rotor 12, and a stator coil 27 wound around the stator core 26. The stator coil 27 is composed of three phase coils. The stator 13 and the second permanent magnet 25 embedded on the outer side of the permanent magnets 24 and 25 face each other.

  According to this configuration, the first electric motor 31 is configured by the inner rotor 11 (specifically, the rotor coil 22) and the outer rotor 12 (specifically, the first permanent magnet 24), and the outer rotor 12 (specifically, the first permanent magnet 24). 2 permanent magnets 25) and the stator 13 (specifically, the stator coil 27) constitute a second electric motor 32. The first electric motor 31 is a DC drive DC motor that rotates the inner rotor 11. The second electric motor 32 is a three-phase motor that rotates the outer rotor 12.

  As shown in FIG. 1, the vehicle 200 is mounted with a stator inverter 33 that converts the stored power of the battery 202 into alternating drive power that can be driven by the second electric motor 32 and outputs the alternating drive power to the stator coil 27. . The stator inverter 33 is fixed to the housing 14 or the vehicle 200 so as not to rotate with the rotation of the rotors 11 and 12. The stator inverter 33 may be integrated with the rotating electrical machine 10 or may be a separate body from the rotating electrical machine 10.

  The rotating electrical machine 10 of the present embodiment includes an electric field coupling type non-contact power feeding system 40 that feeds the DC stored power output from the battery 202 to the first electric motor 31 in a non-contact manner via the coupling capacitors C1 and C2. I have. The electric field coupling type non-contact power feeding system 40 will be described below.

  As shown in FIG. 1, the electric field coupling type non-contact power feeding system 40 includes an electronic unit 42 that is provided in the inner rotor 11 and used to feed power to the rotor coil 22. The electronic unit 42 rotates as the inner rotor 11 rotates.

  The electric field coupling type non-contact power feeding system 40 includes a stator conversion unit (first conversion unit) 43 that performs a DC / AC conversion operation for converting the stored power into AC transmission power (AC power) having a predetermined frequency. And a non-contact power transmission unit 44 that transmits the transmission power converted by the stator conversion unit 43 to the electronic unit 42. In other words, the transmission power can also be referred to as non-contact power supply, and the non-contact power transmission unit 44 can also be referred to as a non-contact power supply unit that supplies the transmission power to the electronic unit 42.

Detailed configurations of the electronic unit 42 and the non-contact power transmission unit 44 will be described.
As shown in FIG. 2, the inner rotor 11 includes a rotating shaft 51 and a cylindrical (specifically cylindrical) insulating member 52 fixed to the rotating shaft 51. The rotating shaft 51 is connected to the output shaft of the engine 201. The insulating member 52 is made of, for example, resin, and covers the rotating shaft 51 from the outside in the radial direction. The axial direction of the rotating shaft 51 is the axial direction of the inner rotor 11, and the axial direction of the insulating member 52 coincides with the axial direction of the inner rotor 11.

  An end 52 a in the axial direction of the insulating member 52 enters a recess 14 a formed in the housing 14. And the bearing 53 which supports the insulating member 52 rotatably is provided between the edge part 52a of the axial direction of the insulating member 52, and the side wall surface of the recessed part 14a. Thereby, the rotating shaft 51 and the insulating member 52 are rotatably supported with respect to the housing 14.

  The non-contact power transmission unit 44 is provided in the inner rotor 11, rotates electrodes 61 and 62 that rotate with the rotation of the inner rotor 11, and a holding electrode 71 that is held so as not to rotate with the rotation of the inner rotor 11. , 72. The rotating electrodes 61 and 62 and the holding electrodes 71 and 72 are electric field coupled, and in detail, are opposed to each other with a predetermined interval.

  The rotating electrodes 61 and 62 have a cylindrical shape fixed to the outer peripheral surface of the insulating member 52, and the axial direction of the rotating electrodes 61 and 62 and the axial direction of the inner rotor 11 coincide with each other. Incidentally, both the rotating electrodes 61 and 62 are arranged apart from each other in the axial direction of the inner rotor 11.

  Both holding electrodes 71 and 72 have a cylindrical shape (in detail, a cylindrical shape) having an inner diameter longer than that of the rotating electrodes 61 and 62. The holding electrodes 71 and 72 are disposed at positions where the rotating electrodes 61 and 62 are electrically coupled. Specifically, the first holding electrode 71 faces the radial direction of the first rotating electrode 61 and the inner rotor 11, and the second holding electrode 72 faces the radial direction of the second rotating electrode 62 and the inner rotor 11. doing.

  The non-contact power transmission unit 44 includes a holding member 80 for holding both holding electrodes 71 and 72 in the housing 14. The holding member 80 has, for example, a cylindrical shape having the same inner diameter as the inner diameters of the both holding electrodes 71 and 72, and has an insulating property. The axial direction of the holding member 80 coincides with the axial direction of the inner rotor 11. The holding member 80 is provided upright in the axial direction of the inner rotor 11 from the periphery of the recess 14 a on the inner surface of the housing 14, and is fixed to the housing 14. Grooves 81 and 82 that are recessed from the inner peripheral surface are formed at positions on the inner peripheral surface of the holding member 80 that face the rotating electrodes 61 and 62 in the radial direction. The holding electrodes 71 and 72 are fixed to the holding member 80 in a state of being fitted in the grooves 81 and 82. Thereby, both the holding electrodes 71 and 72 are prevented from rotating with the rotation of the inner rotor 11. In addition, the electric field coupling type non-contact power feeding system 40 includes a stator side wiring 83 that electrically connects both the holding electrodes 71 and 72 and the stator conversion portion 43. Both holding electrodes 71 and 72 are supplied with electric power for transmission from the stator conversion unit 43 via the stator side wiring 83.

  According to this configuration, the first coupling capacitor C1 is configured by the first rotating electrode 61 and the first holding electrode 71 that are electric field coupled, and the second rotating electrode 62 and the second holding electrode 72 that are electric field coupled are the first. A two-coupling capacitor C2 is configured. Transmission power can be transmitted between the rotating electronic unit 42 and the non-rotating stator converter 43 via the coupling capacitors C1 and C2.

  In this case, both holding electrodes 71 and 72 function as a “power transmission unit” that transmits transmission power to both rotating electrodes 61 and 62, and both rotating electrodes 61 and 62 do not transmit transmission power from both holding electrodes 71 and 72. It functions as a “power receiving unit” that receives power by contact.

  As shown in FIG. 2, the electronic unit 42 includes a circuit board 91 on which various electronic components are mounted. The circuit board 91 has a flat ring shape, for example, and is provided in the inner rotor 11. Specifically, the circuit board 91 is fixed to the insulating member 52 at a position away from the non-contact power transmission unit 44 with the insulating member 52 inserted. For this reason, the circuit board 91 rotates as the inner rotor 11 rotates.

  Mounted on the circuit board 91 is a rotor conversion unit (second conversion unit) 92 that performs an AC / DC conversion operation for converting transmission power into DC power. The rotor conversion unit 92 and the non-contact power transmission unit 44 are electrically connected. Specifically, the first bus bar 93 a in contact with the first rotating electrode 61 and the second bus bar 93 b in contact with the second rotating electrode 62 are embedded in the insulating member 52. Both bus bars 93 a and 93 b are provided at positions shifted from each other in the circumferential direction of the insulating member 52, and extend toward the axial direction of the inner rotor 11, specifically toward the electronic unit 42. Both bus bars 93 a and 93 b are connected to the rotor conversion unit 92. As a result, the transmission power transmitted via both coupling capacitors C1 and C2 is input to the rotor conversion section 92 via both bus bars 93a and 93b.

  The rotor conversion unit 92 is electrically connected to the rotor coil 22 via a plurality of wirings 94 embedded in the insulating member 52. The rotor conversion unit 92 outputs the converted DC power to the rotor coil 22.

Furthermore, the electronic unit 42 includes a rotor controller 95 that controls the rotor conversion unit 92. The rotor controller 95 is mounted on the circuit board 91.
As shown in FIG. 3, the rotating electrical machine 10 includes an operating power supply unit 96 that supplies operating power to the rotor controller 95. The operating power supply unit 96 is used, for example, for AC power supply 96a fixed to the housing 14, a rectifier 96b provided in the inner rotor 11, and non-contact power transmission from the AC power supply 96a to the rectifier 96b. Operating power coupling capacitors Cy1 and Cy2 are provided. The operating power coupling capacitors Cy1 and Cy2 are fixed to the housing 14, are electrically connected to the AC power supply 96a, and are fixed to the inner rotor 11 at positions facing the holding electrodes, and are electrically coupled to the holding electrodes. And a rotating electrode. In FIG. 2, illustration of the operating power coupling capacitors Cy1, Cy2 is omitted.

  The rectifier 96b rectifies the AC power transmitted through the operating power coupling capacitors Cy1 and Cy2 to generate operating power. Then, the rectifier 96 b outputs the operating power to the rotor controller 95. As a result, power is supplied to the rotor controller 95. The power supply to the rotor controller 95 may be constantly performed, or may be performed from a stage before necessary processing (for example, before starting the power running operation).

  The operating power supply unit 96 is configured to receive a part of the DC power output from the rotor conversion unit 92, and a part of the DC power output from the rotor conversion unit 92. Is provided, and a step-down rectifier circuit 96c is provided that rectifies the power to the operating power. The operating power supply unit 96 is configured to be supplied with the operating power output from the step-down rectifier circuit 96c. For this reason, if power transmission from the battery 202 to the first electric motor 31 is performed, even if the power supply from the AC power supply 96a is stopped, the operating power to the rotor controller 95 is reduced. Power is supplied.

  As shown in FIG. 1, the electric field coupling type non-contact power feeding system 40 includes a stator controller 97 that controls the stator inverter 43 and controls the stator converter 43. The stator controller 97 is fixed to the housing 14 or the vehicle 200 so as not to rotate with the rotation of the rotors 11 and 12. The stator controller 97 may be integrated with the rotating electrical machine 10 or may be a separate body.

  The rotor controller 95 and the stator controller 97 are configured to be able to exchange information with each other. Specifically, as shown in FIG. 3, the electric field coupling type non-contact power feeding system 40 includes two signal rotating electrodes provided on the inner rotor 11 and two signal holding electrodes fixed to the housing 14. The signal coupling capacitors Cz1 and Cz2 are provided. Both controllers 95 and 97 are electrically connected via a waveform shaping section 98 provided on both signal coupling capacitors Cz1 and Cz2 and the inner rotor 11 (specifically, the circuit board 91). In FIG. 2, the signal coupling capacitors Cz1 and Cz2 are not shown. Both controllers 95 and 97 correspond to a “control unit”.

  As shown in FIG. 3, the inner rotor 11 is provided with a rotation angle sensor (rotation position sensor) 99 that detects the rotation angle (rotation position) of the inner rotor 11. The rotation angle sensor 99 is, for example, a resolver. The rotation angle sensor 99 transmits the detection result to the rotor controller 95. Thereby, the rotor controller 95 can grasp the rotation angle and the rotation speed of the inner rotor 11. Further, the rotor controller 95 transmits these pieces of information to the stator controller 97 as necessary. In addition, the specific structure which grasps | ascertains the rotation angle and rotation speed of the inner rotor 11 is arbitrary.

  The stator controller 97 is configured to be able to grasp the operation state of the accelerator and the brake and the traveling state of the vehicle 200 in addition to the rotation speed and rotation angle of the inner rotor 11. Then, based on these situations, the stator controller 97 determines whether or not to perform a power running operation that drives the first electric motor 31 using the stored power of the battery 202. When the stator controller 97 determines to perform the power running operation, the stator controller 97 performs control corresponding to the power running operation in cooperation with the rotor controller 95.

Hereinafter, the control related to the power running operation will be described together with the detailed description of the electrical configuration of the electric field coupling type non-contact power feeding system 40.
First, the electrical configuration of the electric field coupling type non-contact power feeding system 40 will be described with reference to FIG. In an equivalent circuit, the electric field coupling type non-contact power feeding system 40 of the present embodiment is directed from the battery 202 toward the rotor coil 22 of the first electric motor 31, the stator conversion unit 43, both coupling capacitors C 1 and C 2 (non-contact type) The power transmission unit 44) and the rotor conversion unit 92 are sequentially provided.

  The stator conversion unit 43 includes a primary side bidirectional switch circuit 101 that is connected in series to the battery 202 and a primary side bidirectional switch circuit 101 that is connected in parallel to the battery 202 and can switch between bidirectional power supply and power cutoff. And a primary shunt capacitor Cs1 connected in parallel to the primary side bidirectional switch circuit 101. The primary side coil L <b> 1 is provided between the primary side bidirectional switch circuit 101 and the battery 202. The primary side shunt capacitor Cs1 is provided between the primary side bidirectional switch circuit 101 and the coupling capacitors C1 and C2. That is, the primary shunt capacitor Cs1 is provided between the primary coil L1 and the coupling capacitors C1 and C2.

  The primary side bidirectional switch circuit 101 includes, for example, a series connection body of a first primary side switching element Q1 and a first diode D1, and a series connection body of a second primary side switching element Q2 and a second diode D2. And have. Both series connection bodies are connected in parallel to each other. In this case, it can be said that both primary side switching elements Q1, Q2 are connected in parallel to the battery 202.

  Both the primary side switching elements Q1, Q2 are configured by, for example, n-type power MOSFETs. The primary side switching elements Q1, Q2 have body diodes (parasitic diodes) Db1, Db2 connected between the source and the drain. The primary side bidirectional switch circuit 101 can flow current in either direction when both the primary side switching elements Q1, Q2 are in the ON state, and both the primary side switching elements Q1, Q2 In the OFF state, the current does not flow regardless of the direction in which the voltage is applied.

  The source of the first primary side switching element Q <b> 1 is connected to the negative terminal of the battery 202. The drain of the first primary side switching element Q1 is connected to the cathode of the first diode D1. The anode of the first diode D1 is connected to the + terminal of the battery 202. The source of the second primary side switching element Q2 is connected to the + terminal of the battery 202. The drain of the second primary side switching element Q2 is connected to the cathode of the second diode D2. The anode of the second diode D2 is connected to the negative terminal of the battery 202.

  The rotor conversion unit 92 is provided between the coupling capacitors C1 and C2 and the first electric motor 31 (in other words, the rotor coil 22). The rotor converter 92 has a circuit configuration that is symmetrical to the stator converter 43 via both coupling capacitors C1 and C2. Specifically, the rotor conversion unit 92 is a secondary coil L2 connected in series to the rotor coil 22 and a secondary coil connected in parallel to the rotor coil 22 and capable of switching between bidirectional power conduction and power interruption. Side bidirectional switch circuit 102 and a secondary side shunt capacitor Cs2 connected in parallel to the secondary side bidirectional switch circuit 102. The secondary side coil L <b> 2 is provided between the secondary side bidirectional switch circuit 102 and the rotor coil 22. The secondary shunt capacitor Cs2 is provided between the secondary bidirectional switch circuit 102 and the coupling capacitors C1 and C2. That is, the secondary shunt capacitor Cs2 is provided between the secondary coil L2 and both coupling capacitors C1 and C2, and is connected in parallel with the primary shunt capacitor Cs1 via both coupling capacitors C1 and C2. Has been.

  Similar to the primary-side bidirectional switch circuit 101, the secondary-side bidirectional switch circuit 102 includes two secondary-side switching elements Q3 and Q4 and two diodes D3 and D4. Both the secondary side switching elements Q3 and Q4 are constituted by, for example, n-type power MOSFETs, and have body diodes (parasitic diodes) Db3 and Db4 connected between the source and the drain. Both secondary side switching elements Q3, Q4 are connected in parallel to the rotor coil 22. The specific connection mode and operation (function) of each element in the secondary side bidirectional switch circuit 102 are the same as the connection mode and operation (function) of each element in the primary side bidirectional switch circuit 101. The detailed explanation is omitted.

  The electric field coupling type non-contact power feeding system 40 is connected in series to the first coupling capacitor C1 separately from the coils L1 and L2, and forms a series resonance circuit 103 in cooperation with the first coupling capacitor C1. A coil L3 is provided. The resonance coil L3 is provided between both shunt capacitors Cs1 and Cs2. Specifically, the resonance coil L3 is provided on a wiring that connects the primary coil L1 and the first holding electrode 71. In the present embodiment, the stator converter 43 has a resonance coil L3.

  According to such a configuration, both primary-side switching elements Q1 and Q2 and both secondary-side switching elements Q3 and Q4 are periodically turned ON / OFF, whereby electric power is transmitted from the battery 202 to the first electric motor 31. (In other words, power feeding) is performed. In addition, it can be said that the ON state of each switching element Q1-Q4 is a conduction | electrical_connection state, and an OFF state can also be said a interruption | blocking state (non-conduction state).

  Here, the stator conversion unit 43 and the series resonance circuit 103 constitute a class E inverter Ei that converts stored power into transmission power by a class E operation. The series resonance circuit 103 and the rotor conversion unit 92 constitute a class E converter Ec that converts transmission power into DC power by class E operation. In other words, the electric field coupling-type non-contact power feeding system 40 includes the series resonance circuit 103 that functions as part of both the class E inverter Ei and the class E converter Ec.

  The power value of the transmission power is set to such an extent that the first electric motor 31 can be driven. In this case, the capacitances of both coupling capacitors C1 and C2 are set corresponding to the frequency and voltage value of the transmission power so that the transmission power can be transmitted. The capacitances of both shunt capacitors Cs1, Cs2 and the inductances of the coils L1, L2, L3 are set in correspondence with the capacitances of both coupling capacitors C1, C2 so as to satisfy the class E operation condition. The class E operation condition is a condition in which the applied voltage of each switching element Q1 to Q4 is “0” and the slope of the applied voltage waveform is “0” when the switching elements Q1 to Q4 are turned on.

  The capacitances of the coupling capacitors C1 and C2 depend on the axial lengths of the rotating electrodes 61 and 62 and the holding electrodes 71 and 72, the ratio between the diameters of the rotating electrodes 61 and 62 and the diameters of the holding electrodes 71 and 72, and the like. Determined based on. In this case, if the capacitances of both the coupling capacitors C1 and C2 are increased, the non-contact power transmission unit 44 tends to be large.

  The stator controller 97 causes the stator converter 43 (in other words, class E inverter Ei) to perform a DC / AC conversion operation by periodically turning on and off both primary-side switching elements Q1 and Q2. is there. Incidentally, the stator controller 97 turns ON / OFF both the primary side switching elements Q1, Q2 simultaneously. That is, the switching modes of both primary side switching elements Q1, Q2 are synchronized. In other words, the switching waveforms of both primary side switching elements Q1, Q2 are the same.

  The rotor controller 95 causes the rotor conversion section 92 (in other words, the E class converter Ec) to perform an AC / DC conversion operation by periodically turning on and off both the secondary side switching elements Q3 and Q4. is there. Incidentally, the rotor controller 95 turns on / off both the secondary side switching elements Q3, Q4 simultaneously. That is, the switching modes of the secondary side switching elements Q3 and Q4 are synchronized. In other words, the switching waveforms of both the secondary side switching elements Q3, Q4 are the same.

  Here, the stator controller 97 periodically turns both primary switching elements Q1, Q2 on and off using the clock signal CK that periodically switches to HI / LOW. In this case, the frequency of the transmission power coincides with the switching frequency of both primary side switching elements Q1, Q2, and coincides with the frequency of the clock signal CK.

  Further, the stator controller 97 transmits the clock signal CK to the rotor controller 95. In this case, the clock signal CK is differentiated when transmitting the signal coupling capacitors Cz1 and Cz2.

  On the other hand, the waveform shaping unit 98 provided in the inner rotor 11 generates (restores) the clock signal CK from the differential waveform of the clock signal CK, and transmits the clock signal CK to the rotor controller 95. Thereby, the rotor controller 95 can grasp the clock signal CK.

  Based on the clock signal CK, the rotor controller 95 delays both primary-side switching elements Q1 and Q2 by a delay time Td and periodically turns on / off both secondary-side switching elements Q3 and Q4. / DC conversion operation is executed. In this case, the switching frequency of each of the switching elements Q1 to Q4 is the same, and specifically the same as the frequency of the clock signal CK. Further, the on / off duty ratios of the switching elements Q1 to Q4 are the same. For this reason, as shown in FIGS. 4A and 4B, each of the switching elements Q1 to Q4 has both secondary-side switching elements Q3 and Q3 with respect to the rising timing of both primary-side switching elements Q1 and Q2. In the state where the rise timing of Q4 is delayed by the delay time Td, it is turned ON / OFF at the same cycle T.

  Here, the present inventor has found characteristics in which the polarity and power value of the DC power output from the rotor converter 92 depend on the delay time Td. The characteristics will be described with reference to FIG. FIG. 5 is a graph showing the relationship between the delay time Td and the polarity and power value of the DC power output from the rotor converter 92.

  Incidentally, the DC power output from the rotor conversion unit 92 is DC power input to the first electric motor 31 (specifically, the rotor coil 22). The DC power is power with a constant power transmission direction. That is, the DC power may be power that has a constant power transmission direction, and includes power whose value varies periodically. In addition, the graph of FIG. 5 shows the average value per unit time of the direct-current power which is changing periodically.

  As shown in FIG. 5, the polarity of the DC power varies depending on the delay time Td. Specifically, the polarity of the DC power is negative when the delay time Td is 0 to Tdx, and is positive when the delay time Td is Tdx to T. In the present embodiment, 0 to Tdx corresponds to “negative delay time”, and Tdx to T correspond to “positive delay time”.

  Further, the power value of the DC power varies according to the delay time Td. In this case, the delay time Td that maximizes the power value (absolute value) of the negative DC power is defined as the first delay time Td1. The delay time Td at which the power value of the positive DC power is maximized is defined as a second delay time Td2.

  The rotor controller 95 determines the delay time Td based on the rotation angle of the inner rotor 11 detected by the rotation angle sensor 99. For example, when the rotation angle of the inner rotor 11 is within a range of 0 to π, the rotor controller 95 determines the second delay time Td2 as an example of the positive delay time corresponding to the positive DC power, and When the rotation angle is in the range of π to 2π, the first delay time Td1 is determined as an example of the negative delay time corresponding to the negative DC power. That is, in the present embodiment, the rotor controller 95 variably controls the delay time Td of the secondary switching elements Q3 and Q4 with respect to the primary switching elements Q1 and Q2 according to the rotation angle of the inner rotor 11. Thus, the polarity of the DC power input to the first electric motor 31 is variably controlled.

  That is, the rotor controller 95 causes the rotor coil 22 to alternately input positive DC power and negative DC power by periodically changing the delay time Td. Specifically, the rotor controller 95 alternately switches the delay time Td between the second delay time Td2 and the first delay time Td1 at a switching frequency corresponding to the rotational speed of the inner rotor 11, thereby the rotor conversion unit 92. Positive DC power and negative DC power are alternately output toward the rotor coil 22. In this case, the rotor controller 95 can perform variable control of the rotation speed of the first electric motor 31 by variably controlling the switching frequency. The switching frequency is twice the number of rotations of the inner rotor 11. Incidentally, the frequency of the transmission power (specifically, the switching frequency of each switching element Q1 to Q4) is set higher than the switching frequency.

Next, the operation of this embodiment will be described.
As shown in FIGS. 6A and 6B, the delay time Td is alternately switched between the second delay time Td2 and the first delay time Td1 in accordance with the rotation angle (rotation position) of the inner rotor 11. ing. For this reason, as shown in FIG.6 (c), the polarity of the direct-current power output from the rotor conversion part 92 switches periodically. Thereby, the 1st electric motor 31 which is a direct current motor rotates.

According to the embodiment described above in detail, the following effects are obtained.
(1) The rotating electrical machine 10 has a predetermined frequency for the electric power stored in the inner rotor 11, the first electric motor 31 as a DC motor having the rotor coil 22 provided in the inner rotor 11, and the battery 202. And a stator conversion unit 43 that performs a DC / AC conversion operation for conversion into AC transmission power. The rotating electrical machine 10 includes a non-contact power transmission unit 44 that performs non-contact power transmission via the coupling capacitors C1 and C2. The coupling capacitors C1 and C2 are held so as not to rotate with the rotation of the inner rotor 11, and the holding electrodes 71 and 72 to which transmission power is input, and the inner electrodes 11 and the holding electrodes 71 and 72 are connected. It is composed of rotating electrodes 61 and 62 that receive power for transmission without contact. Further, the rotating electrical machine 10 is provided in the inner rotor 11, performs an AC / DC conversion operation for converting transmission power received by the rotating electrodes 61 and 62 into DC power, and outputs the DC power to the rotor coil 22. A rotor converter 92 is provided.

  The stator conversion unit 43 includes primary side switching elements Q1, Q2, and performs a DC / AC conversion operation when the primary side switching elements Q1, Q2 are periodically turned ON / OFF. The stator conversion unit 92 includes secondary side switching elements Q3 and Q4, and performs AC / DC conversion operation when the secondary side switching elements Q3 and Q4 are periodically turned ON / OFF. Further, the stator converter 92 has the polarity of the DC power output to the rotor coil 22 in accordance with the delay time Td of the rising timing of the secondary side switching elements Q3, Q4 with respect to the rising timing of the primary side switching elements Q1, Q2. It is comprised so that it may switch.

  In this configuration, the rotating electrical machine 10 includes a rotation angle sensor 99 that detects the rotation angle of the inner rotor 11 and both controllers 95 and 97 as control units that control the switching elements Q1 to Q4. Both controllers 95 and 97 periodically switch the switching elements Q1 to Q4 so that the rising timing of the secondary side switching elements Q3 and Q4 is delayed by the delay time Td from the rising timing of the primary side switching elements Q1 and Q2. Turn ON / OFF. Then, the controllers 95 and 97 change the delay time Td based on the detection result of the rotation angle sensor 99, so that the DC power having the polarity corresponding to the rotation angle of the inner rotor 11 is output from the rotor conversion unit 92. In this way, the switching elements Q1 to Q4 are controlled.

  According to this configuration, non-contact power feeding to the inner rotor 11 is realized by the non-contact power transmission unit 44. Thereby, it is possible to supply power to the inner rotor 11 without providing a brush. Further, according to the present embodiment, paying attention to the fact that the polarity of the DC power output from the rotor converter 92 is switched according to the delay time Td, the delay time Td is changed according to the rotation angle of the inner rotor 11. It has come to be. Thereby, DC power having a polarity corresponding to the rotation angle of the inner rotor 11 can be input to the first electric motor 31 without providing a commutator. From the above, the first electric motor 31 that is a DC motor can be driven without providing a brush or a commutator.

  In particular, in the present embodiment, a DC motor is adopted as the one that rotates the inner rotor 11. Thereby, it is not necessary to provide the inner rotor 11 with an inverter or the like that has a plurality of switching elements and converts the DC power output from the rotor converter 92 into the driving power of the three-phase motor. Therefore, the configuration of the inner rotor 11 can be simplified and the number of switching elements can be reduced.

  (2) The controllers 95 and 97 have a delay time Td at a switching frequency corresponding to the rotational speed of the inner rotor 11, a positive delay time corresponding to positive DC power, and a negative delay time corresponding to negative DC power. Are alternately output to the rotor coil 22 from the rotor conversion unit 92 so that positive DC power and negative DC power are alternately output. According to such a configuration, positive DC power and negative DC power can be alternately input to the first electric motor 31 in accordance with the rotational speed of the inner rotor 11. Thereby, the rotation of the inner rotor 11 and the polarity of the DC power input to the rotor coil 22 can be synchronized. Moreover, the rotation speed of the inner rotor 11 can be changed by changing the switching frequency.

  (3) The stator controller 97 periodically turns ON / OFF both the primary side switching elements Q1, Q2 using the clock signal CK, and transmits the clock signal CK to the rotor controller 95. Based on the clock signal CK, the rotor controller 95 delays the rising timings of both the secondary side switching elements Q3 and Q4 by a delay time Td from the rising timing of both the primary side switching elements Q1 and Q2. Thereby, compared with the structure which turns ON / OFF both primary side switching elements Q1, Q2 and both secondary side switching elements Q3, Q4 using a separate clock signal, delay time Td is from a desired value. The situation which shifts can be controlled.

  (4) The frequency of the transmission power is set higher than the switching frequency. According to such a configuration, the first electric motor 31 can be suitably driven, and non-contact power transmission via both coupling capacitors C1 and C2 can be suitably performed.

  More specifically, in order to drive the first electric motor 31, it is necessary to ensure a certain amount of power for transmission power for non-contact power transmission via both coupling capacitors C 1 and C 2. On the other hand, for example, it is conceivable to increase the frequency of the transmission power or increase the capacitances of both coupling capacitors C1 and C2. In this case, if the capacitances of both the coupling capacitors C1 and C2 are to be increased, there is a concern that the non-contact power transmission unit 44 may be enlarged.

  On the other hand, in the present embodiment, since the frequency of the transmission power is set higher than the switching frequency, the transmission power having a necessary magnitude is suppressed while suppressing the increase in size of the non-contact power transmission unit 44. Can be supplied to the inner rotor 11 in a non-contact manner. Further, according to this configuration, even if the frequency of the transmission power is set higher than the switching frequency as described above, it is difficult for the first electric motor 31 to be driven.

  (5) The rotor conversion unit 92 is configured by using the secondary side switching elements Q3 and Q4, and includes the secondary side bidirectional switch circuit 102 capable of flowing a current bidirectionally. The secondary bidirectional switch circuit 102 is connected to the rotor coil 22 in parallel. Thereby, the polarity of the direct-current power output from the rotor conversion part 92 can be varied according to the delay time Td.

  (6) The rotating electrical machine 10 includes a resonance coil L3 that is connected in series with the first coupling capacitor C1 and forms the series resonance circuit 103 in cooperation with the first coupling capacitor C1. The class E inverter Ei that performs class E operation is configured by the stator conversion unit 43 and the series resonance circuit 103, and the class E converter Ec that performs class E operation is configured by the rotor conversion unit 92 and the series resonance circuit 103. Yes.

  Specifically, the primary-side bidirectional switch circuit 101 having both primary-side switching elements Q1, Q2 is connected in parallel to the battery 202. The stator converter 43 is provided between the primary side bidirectional switch circuit 101 and the battery 202, and is connected to the battery 202 in series. The primary side coil L1, the primary side coil L1, and both coupling capacitors C1 and C2 And a primary shunt capacitor Cs1 connected in parallel to the primary bidirectional switch circuit 101.

  The rotor conversion unit 92 is provided between the secondary side bidirectional switch circuit 102 and the rotor coil 22, and is connected in series to the rotor coil 22, the secondary side coil L2, the secondary side coil L2, and the double coupling capacitor C1. , C2 and a secondary shunt capacitor Cs2 connected in parallel to the secondary bidirectional switch circuit 102. The series resonant circuit 103 is provided between the shunt capacitors Cs1 and Cs2.

  According to this configuration, since the power conversion operation is performed by the class E operation, the switching loss of each switching element Q1 to Q4 can be reduced. More specifically, the class E operation is an operation mode in which the applied voltage of each switching element Q1 to Q4 and the gradient of the applied voltage are “0” when the switching elements Q1 to Q4 are turned on. In this case, ZVS operation is realized at turn-on, and turn-off loss is minimized. Thereby, the efficiency improvement of the electric field coupling type non-contact electric power feeding system 40 can be aimed at.

  Here, in order to realize the class E operation, a series resonance circuit is required. In this regard, in the present embodiment, the first coupling capacitor C <b> 1, which is an essential configuration for performing electric field coupling type non-contact power transmission (in other words, feeding), is employed as a part of the series resonant circuit 103. . Thereby, the configuration can be simplified as compared with a configuration in which a dedicated capacitor is separately provided. In other words, the multifunction of the first coupling capacitor C1 is realized.

  Further, the series resonance circuit 103 is used for both the class E inverter Ei and the class E converter Ec. Therefore, the configuration can be simplified as compared with the configuration in which the dedicated series resonance circuit is provided in both the class E inverter Ei and the class E converter Ec.

  (7) The rotating electrical machine 10 includes an outer rotor 12 that is disposed on the radially outer side with respect to the inner rotor 11 and that can rotate independently of the inner rotor 11. The first electric motor 31 is constituted by the rotor coil 22 of the inner rotor 11 and the first permanent magnet 24 of the outer rotor 12. In this case, it is necessary to supply power to the rotor coil 22 provided in the rotating inner rotor 11. On the other hand, in this embodiment, the non-contact power transmission unit 44 is used as a power supply to the rotor coil 22. Thereby, in the double rotor type rotary electric machine 10, brushlessness can be achieved.

In addition, you may change the said embodiment as follows.
The rotor conversion unit 92 may include a resonance coil L3. Specifically, the resonance coil L3 may be on a wiring connecting the first rotary electrode 61 and the secondary coil L2.

  ○ The specific configuration of the rotating electrode and the holding electrode constituting the coupling capacitor is arbitrary. For example, the two electrodes may have a disk ring shape through which the insulating member 52 is inserted and be opposed to each other in the axial direction of the inner rotor 11.

The class E inverter Ei may perform step-up or step-down voltage value conversion. Similarly, the class E converter Ec may perform step-up or step-down voltage value conversion.
○ Focusing on the fact that the power value of the DC power fluctuates according to the delay time Td, the controllers 95 and 97 change the delay time Td to thereby change the power of the DC power input to the first electric motor 31. You may perform variable control of a value. That is, the delay time Td is not limited to the first delay time Td1 or the second delay time Td2 at which the power value (absolute value) is maximum. In other words, the controllers 95 and 97 may be configured to change both the power value and the polarity of the DC power by continuously changing the delay time Td based on the detection result of the rotation angle sensor 99.

  As shown in FIG. 7, the stator controller 97 may control both secondary side switching elements Q3 and Q4. In this case, the rotation angle sensor 99 transmits the detection result to the stator controller 97. Then, the stator controller 97 determines the delay time Td based on the detection result of the rotation angle sensor 99, and the control signal SG delayed by the delay time Td with respect to the clock signal CK via the waveform shaping unit 98. , Transmitted to both secondary side switching elements Q3, Q4. Thereby, simplification of the rotor controller 95 can be achieved.

The specific configuration of the bidirectional switch circuit is not limited to that of the embodiment.
For example, as shown in FIG. 8, the primary-side bidirectional switch circuit 111 may be two primary-side switching elements Q1, Q2 whose drains are connected in series with each other. Similarly, the secondary side bidirectional switch circuit 112 may be secondary side switching elements Q3 and Q4 whose drains are connected in series with each other. However, if attention is paid to the fact that the rectification efficiency of the body diodes Db1 to Db4 is worse than the rectification efficiency of the diodes D1 to D4, the configuration as in the embodiment is preferable.

  For example, as shown in FIG. 9, the primary bidirectional switch circuit 121 includes a bridge circuit 121a composed of four diodes and a primary side provided on a wiring 121b that connects the intermediate points of the bridge circuit 121a. The structure which has switching element Q1 may be sufficient. Similarly, the secondary-side bidirectional switch circuit 122 includes a bridge circuit 122a composed of four diodes, and a secondary-side switching element Q3 provided on a wiring 122b that connects the intermediate points of the bridge circuit 122a. But you can. In short, the specific configuration of the bidirectional switch circuit is arbitrary as long as current can flow in both directions, and any configuration having at least one switching element may be used.

  A primary side unidirectional switch circuit may be provided instead of the primary side bidirectional switch circuit 101. Specifically, for example, the second primary side switching element Q2 may be omitted, or both the diodes D1 and D2 may be omitted in addition to the second primary side switching element Q2. That is, the stator converter 43 and the rotor converter 92 are not limited to the same configuration.

As long as the stator conversion unit 43 can perform the DC / AC conversion operation, the specific configuration thereof is arbitrary, and for example, the stator conversion unit 43 may not satisfy the E class operation condition.
○ The rotor conversion unit 92 can perform any AC / DC conversion operation and can switch the polarity of the DC power to be output. The specific configuration of the rotor conversion unit 92 is arbitrary. For example, the rotor conversion unit 92 does not satisfy the E-class operation condition. May be.

O The switching element is not limited to an n-type MOSFET, but is arbitrary such as an IGBT.
The number of coupling capacitors is arbitrary. For example, non-contact power transmission may be performed using a plurality of coupling capacitors connected in parallel to each other.

The DC power source is the battery 202, but is not limited to this, and any power storage device that can be charged / discharged may be used. For example, an electric double layer capacitor may be used.
The rotary electric machine 10 should just have at least one rotor provided with the coil. For example, the rotating electrical machine may have a configuration having one rotor and a stator. The rotating electrical machine may have a configuration in which the stator 13 is omitted and two rotors are provided.

  The rotary electric machine 10 has been used for a hybrid transaxle, but may be used for other purposes. Further, the vehicle is not limited to a vehicle having an engine and a power storage device, and is arbitrary.

Next, a preferable example that can be grasped from the embodiment and another example will be described below.
(A) The rotor is an inner rotor, and the rotating electrical machine is provided on an outer side in the radial direction with respect to the inner rotor, and includes an outer rotor that can rotate independently from the inner rotor, and the outer rotor is a permanent magnet. The rotating electrical machine according to claim 1, comprising:

  DESCRIPTION OF SYMBOLS 10 ... Rotary electric machine, 11 ... Inner rotor, 12 ... Outer rotor, 13 ... Stator, 22 ... Rotor coil, 31 ... 1st electric motor, 32 ... 2nd electric motor, 40 ... Electric field coupling type non-contact electric power feeding system, 42 ... Electronic unit 43 ... Stator conversion unit 44 ... Non-contact power transmission unit 61, 62 ... Rotating electrode, 71, 72 ... Holding electrode, 92 ... Rotor converting unit, 95 ... Rotor controller, 97 ... Stator controller, 99 ... Rotation Angle sensor (position grasping part), 101, 111, 121 ... primary side bidirectional switch circuit, 102, 112, 122 ... secondary side bidirectional switch circuit, 103 ... series resonance circuit, 200 ... vehicle, 202 ... battery ( DC power supply), C1, C2 ... coupling capacitor, L1 ... primary coil, L2 ... secondary coil, L3 ... resonant coil, Q1, Q2 ... primary coil Etching device, Q3, Q4 ... 2 primary switching element, Cs1 ... 1 primary shunt capacitor, Cs2 ... 2-side shunt capacitor, Ei ... E class inverter, Ec ... E class converter, Td ... delay time.

Claims (5)

A rotor,
A direct current motor having a rotor coil provided in the rotor;
In a rotating electrical machine comprising:
A first converter that performs a DC / AC conversion operation for converting a DC power source output from a DC power source into an AC power having a predetermined frequency;
A holding electrode that is held so as not to rotate with the rotation of the rotor and that receives the AC power, and a rotating electrode that is provided on the rotor and receives the AC power in a non-contact manner from the holding electrode And a non-contact power transmission unit that performs non-contact power transmission through a coupling capacitor constituted by the holding electrode and the rotating electrode,
A second conversion unit that is provided in the rotor, performs an AC / DC conversion operation for converting AC power received by the rotating electrode into DC power, and outputs the DC power to the rotor coil;
A position grasping unit for grasping the rotational position of the rotor;
With
The first conversion unit includes a primary side switching element, and performs the DC / AC conversion operation when the primary side switching element is periodically turned ON / OFF.
The second conversion unit includes a secondary side switching element, and performs the AC / DC conversion operation when the secondary side switching element is periodically turned ON / OFF, and the primary side According to the delay time of the rising timing of the secondary side switching element with respect to the rising timing of the switching element, the polarity of the DC power output to the rotor coil is switched,
The rotating electrical machine includes a control unit that controls the primary side switching element and the secondary side switching element,
The control unit periodically turns both the switching elements on and off so that the rising timing of the secondary switching element is delayed by a delay time from the rising timing of the primary switching element, and the position A rotating electrical machine characterized in that, by changing the delay time based on a grasping result of a grasping unit, a DC power having a polarity corresponding to a rotational position of the rotor is output from the second conversion unit.   The control unit switches the delay time alternately between a positive delay time corresponding to positive DC power and a negative delay time corresponding to negative DC power at a switching frequency corresponding to the rotation speed of the rotor. The rotating electrical machine according to claim 1, wherein positive DC power and negative DC power are alternately output from the second converter to the rotor coil.   The rotating electrical machine according to claim 2, wherein the frequency of the AC power is set to be higher than the switching frequency. The second conversion unit is configured using at least the secondary-side switching element, and includes a bidirectional switch circuit capable of flowing a current bidirectionally,
The rotary electric machine according to claim 1, wherein the bidirectional switch circuit is connected in parallel to the rotor coil. The primary side switching element is connected in parallel to the DC power source,
The secondary side switching element is connected in parallel to the rotor coil,
The first converter is
A primary coil provided between the primary side switching element and the DC power source and connected in series to the DC power source;
A primary shunt capacitor provided between the primary coil and the coupling capacitor and connected in parallel to the primary switching element;
Have
The second converter is
A secondary coil provided between the secondary switching element and the rotor coil and connected in series to the rotor coil;
A secondary shunt capacitor provided between the secondary coil and the coupling capacitor and connected in parallel to the secondary switching element;
Have
The rotating electrical machine includes a resonance coil that is connected in series with the coupling capacitor and forms a series resonance circuit in cooperation with the coupling capacitor;
The series resonant circuit is provided between the primary shunt capacitor and the secondary shunt capacitor,
The class E inverter is constituted by the first conversion part and the series resonance circuit, and the class E converter is constituted by the second conversion part and the series resonance circuit. The rotating electrical machine described in 1.

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