JP2017073902A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of driving a three-phase motor without using a brush.SOLUTION: A rotary electric machine 10 comprises: an inner rotor 11; and a first electric motor 31 that has respective phase rotor coils 22u-22w provided in the inner rotor 11 and that serves as a three-phase motor. The rotary electric machine 10 comprises a plurality of phase power feeding parts 41u-41w corresponding to the plurality of phase rotor coils 22u-22w. The u-phase power feeding part 41u feeds a power to the u-phase rotor coil 22u by using electric field coupling type non-contact power transmission via both u-phase coupling capacitors Cu1 and Cu2. The v-phase power feeding part 41v feeds a power to the v-phase rotor coil 22v by using electric field coupling type non-contact power transmission via both v-phase coupling capacitors Cv1 and Cv2. The w-phase power feeding part 41w feeds a power to the w-phase rotor coil 22w by using electric field coupling type non-contact power transmission via both w-phase coupling capacitors Cw1 and Cw2.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, as an electric motor, there exists a three-phase motor which has a u-phase rotor coil, a v-phase rotor coil, and a w-phase rotor coil, for example. In order to drive the three-phase motor, it is necessary to individually supply power to each phase rotor coil.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the rotary electric machine which can drive a three-phase motor, without using a brush.

  A rotating electrical machine that achieves the above object includes a rotor, a three-phase motor having a u-phase rotor coil, a v-phase rotor coil, and a w-phase rotor coil provided in the rotor; Using the contact power transmission, the u-phase power feeding unit that feeds power to the u-phase rotor coil and the electric field coupling type non-contact power transmission through the v-phase coupling capacitor to the v-phase rotor coil. A v-phase power feeding unit that feeds power and a w-phase power feeding unit that feeds power to the w-phase rotor coil using electric field coupling type non-contact power transmission via a w-phase coupling capacitor. It is characterized by being.

  According to such a configuration, non-contact power feeding to each phase rotor coil provided in the rotor is realized by each phase power feeding section. Thereby, it is possible to supply power to each phase rotor coil without providing a brush.

  In addition, since the phase power feeding unit is individually provided for each phase rotor coil, the current feeding mode of each phase rotor coil can be individually controlled by individually controlling the power feeding mode by each phase power feeding unit. it can. Thereby, a three-phase motor can be driven. Further, since three phase power feeding units are provided, the required power value required for each phase power feeding unit can be small. Thereby, the capacitance of each phase coupling capacitor can be lowered.

  For each of the rotating electrical machines, each of the phase coupling capacitors includes a holding electrode that is held so as not to rotate with the rotation of the rotor, and a rotating electrode that is provided on the rotor and disposed opposite to the holding electrode. The u-phase power feeding unit is configured to perform 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, and the AC power is converted to the u power. A u-phase first converter that outputs to the holding electrode of the phase coupling capacitor, and an AC power provided in the rotor and received by the rotating electrode of the u-phase coupling capacitor can be driven by the three-phase motor. An AC / AC conversion operation is performed to convert the driving power corresponding to the u phase out of the phase alternating current without passing through the DC power, and the driving power corresponding to the u phase is transferred to the u phase rotor. A u-phase second conversion unit for outputting to the power supply, the v-phase power supply unit performing a DC / AC conversion operation for converting the power supply power to the AC power, and the AC power is connected to the v-phase coupling The v-phase first converter that outputs to the holding electrode of the capacitor and the AC power provided by the rotating electrode of the v-phase coupling capacitor that corresponds to the v phase of the three-phase AC are provided in the rotor. A v-phase second conversion unit that performs an AC / AC conversion operation for converting the driving power into direct-current power without passing through the DC power and outputs the driving power corresponding to the v-phase to the v-phase rotor coil; The w-phase power feeding unit performs a DC / AC conversion operation for converting the power source power to the AC power, and outputs the AC power to the holding electrode of the w-phase coupling capacitor; , Provided in the rotor An AC / AC conversion operation for converting the AC power received by the rotating electrode of the w-phase coupling capacitor into drive power corresponding to the w-phase of the three-phase AC without passing through DC power; And it is good to provide the w phase 2nd conversion part which outputs the drive electric power corresponding to the said w phase to the said w phase rotor coil.

  According to such a configuration, the stored power is converted into AC power by each phase first converter, and the converted AC power is transmitted to the rotor via each phase coupling capacitor. Then, AC power is converted into driving power corresponding to each phase by each phase second conversion section provided in the rotor. Thereby, a three-phase motor can be driven using stored electric power.

  In particular, according to this configuration, the AC power is converted into driving power without passing through the DC power by each phase second conversion unit. Thereby, since it is not necessary to provide a circuit for rectifying AC power and a circuit for converting the rectified DC power into driving power, respectively, the rotor configuration can be simplified. In addition, a large torque can be generated by the three-phase motor as compared with a configuration in which half-wave DC power is output to each phase rotor coil.

  In the rotating electrical machine, each of the phase first conversion units has a primary side switching element, and performs the DC / AC conversion operation by periodically turning on and off the primary side switching element. And each phase second conversion unit has a secondary switching element, and the secondary switching element is periodically delayed by a delay time with respect to the primary switching element of the same phase. By turning ON / OFF, electric power is output to the corresponding phase rotor coil, and the direction of the current flowing through the corresponding phase rotor coil is switched according to the delay time, and the rotation The electric machine includes a control unit that controls the primary side switching element of each phase first conversion unit and the secondary side switching element of each phase second conversion unit, The control unit is configured such that the rising timing of the secondary switching element of the u-phase second conversion unit is delayed by a delay time from the rising timing of the primary switching element of the u-phase first conversion unit. Are periodically turned on and off, and the delay time is periodically changed, so that the DC / AC conversion operation of the u-phase first converter and the AC / AC of the u-phase second converter are In a state where the conversion operation is executed and the rising timing of the secondary switching element of the v-phase second conversion unit is delayed by a delay time from the rising timing of the primary switching element of the v-phase first conversion unit By periodically turning both on and off and periodically changing the delay time, the DC / AC conversion operation of the v-phase first conversion unit and the v The AC / AC conversion operation of the second conversion unit is executed, and the rising timing of the secondary side switching element of the w phase second conversion unit is the rising timing of the primary side switching element of the w phase first conversion unit. By periodically turning both on / off in a state delayed by a delay time, and periodically changing the delay time, the DC / AC conversion operation of the w-phase first conversion unit and the w The AC / AC conversion operation of the phase second conversion unit may be executed.

  According to such a configuration, each phase second conversion unit is configured to switch the direction of the current flowing through the corresponding phase rotor coil in accordance with the delay time. Therefore, by periodically changing the delay time, AC drive power can be generated from AC power. As a result, the AC / AC conversion operation can be realized without providing a switch for switching the power transmission path or performing complicated control, thereby simplifying the configuration.

  The “corresponding phase rotor coil” means a u-phase rotor coil in the u-phase second conversion unit, a v-phase rotor coil in the v-phase second conversion unit, and a w-phase second conversion unit. Means a w-phase rotor coil.

  For the rotating electrical machine, the delay time is a first power running delay time in which a power transmission direction is a first direction from the DC power source toward the three-phase motor, and a forward current flows through the corresponding phase rotor coil. And a second power running delay time in which a power transmission direction is the first direction and a current in a direction opposite to the forward direction flows through the corresponding phase rotor coil, and the control unit includes a u-phase The primary-side switching element and the secondary-side switching element corresponding to the above are shifted by the first powering delay time and periodically turned ON / OFF, and shifted by the second powering delay time. The u-phase second powering operation that is periodically turned on and off alternately is repeatedly executed, and the primary-side switching element and the secondary-side switching element corresponding to the v-phase correspond to the first power-running delay time. The v-phase first powering operation that is periodically turned on / off and the v-phase second powering operation that is periodically turned on / off with a shift by the second powering delay time are alternately and repeatedly executed in the w phase. The corresponding primary side switching element and the secondary side switching element are shifted by the first powering delay time and periodically turned ON / OFF, and the second powering delay time is shifted by the second powering delay time. The primary side switching element of each phase first conversion unit and the secondary side of each phase second conversion unit so as to alternately and repeatedly execute a w-phase second power running operation that is periodically turned ON / OFF The switching element may be controlled.

  According to such a configuration, in each phase, the first powering operation shifted by the first powering delay time and the second powering operation shifted by the second powering delay time are alternately and repeatedly executed, so that the above-described effects can be obtained. Can be obtained.

  With respect to the rotating electrical machine, the control unit sets the execution timing of the u-phase first powering operation, the execution timing of the v-phase first powering operation, and the execution timing of the w-phase first powering operation for each predetermined period. It is good to shift.

According to such a configuration, the phases of the driving power corresponding to the respective phases can be made different from each other relatively easily.
For the rotating electrical machine, the control unit performs an execution cycle of the u-phase unit powering operation in which the u-phase first powering operation and the u-phase second powering operation are combined in accordance with the rotation speed of the rotor, and the v An execution cycle of a v-phase unit powering operation that combines the phase-first powering operation and the v-phase second powering operation, and a w-phase unit powering operation that combines the w-phase first powering operation and the w-phase second powering operation. It is good to control the execution cycle.

According to such a configuration, the rotation of the rotor and the energization mode of each phase rotor coil can be synchronized, and the three-phase motor can be suitably driven.
In the rotating electrical machine, the u-phase power feeding unit is connected in series with the u-phase coupling capacitor, and has a u-phase resonance coil that forms a u-phase series resonance circuit in cooperation with the u-phase coupling capacitor. The u-phase first converter and the u-phase series resonance circuit constitute a u-phase E-class inverter that performs class E operation, and the u-phase second converter and the u-phase series resonance circuit A u-phase E-class converter that performs E-class operation is configured, and the v-phase power feeding unit is connected in series with the v-phase coupling capacitor, and in cooperation with the v-phase coupling capacitor, a v-phase series resonance circuit A v-phase E class inverter that performs class E operation is configured by the v-phase first converter and the v-phase series resonance circuit, and the v-phase second converter Class E operation with the v-phase series resonant circuit A v-phase E class converter is configured, and the w-phase power feeding unit is connected in series with the w-phase coupling capacitor and forms a w-phase series resonance circuit in cooperation with the w-phase coupling capacitor. A w-phase E-class inverter having a phase-resonance coil and performing a class-E operation by the w-phase first converter and the w-phase series resonant circuit, and the w-phase second converter and the w-phase series A w-phase class E converter that performs class E operation may be configured by the resonance circuit.

  According to this configuration, since the DC / AC conversion operation and the AC / AC conversion operation are realized by the class E operation, the switching loss of each switching element can be reduced. Thereby, the efficiency improvement of the electric power transmission from DC power supply to a three-phase 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.

  Regarding the rotating electrical machine, the DC power supply is a chargeable / dischargeable power storage device, and each of the phase power feeding units receives the regenerative power generated by the three-phase motor via the phase coupling capacitor. It is good to be comprised so that electric power feeding to an apparatus is possible.

  According to this configuration, the power storage device can be charged using regenerative power generated by the three-phase motor.

  According to this invention, a three-phase motor can be driven without using a brush.

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 u phase switching elements in 1 period, (b) is a time chart which shows the switching mode of both the secondary side u phase switching elements in 1 period. The graph which shows the relationship between delay time, an electric power transmission direction, and the electric power value transmitted. (A) is a time chart which shows the switching mode of both primary side u phase switching elements at the time of power running operation, (b) is a time chart which shows the switching mode of both secondary side u phase switching elements at the time of power running operation. (C) is a time chart schematically showing a current flowing through the u-phase rotor coil during the power running operation, and (d) is a time chart showing a switching mode of both primary side v-phase switching elements during the power running operation. (E) is a time chart showing the switching mode of both secondary-side v-phase switching elements during the power running operation, and (f) is a time schematically showing the current flowing through the v-phase rotor coil during the power running operation. (G) is a time chart showing the switching mode of both primary side w-phase switching elements during powering operation. (H) is a time chart showing the switching mode of both secondary side w-phase switching elements during power running operation, and (i) schematically shows the current flowing through the w-phase rotor coil during power running operation. Time chart shown. (A) is a time chart which shows the switching mode of both primary side u phase switching elements at the time of regeneration operation, (b) is a time chart which shows the switching mode of both secondary side u phase switching elements at the time of regeneration operation. (C) is a time chart showing the switching mode of both primary-side v-phase switching elements during regenerative operation, and (d) is the time chart showing the switching mode of both secondary-side v-phase switching elements during regenerative operation. It is a chart, (e) is a time chart which shows the switching mode of both primary side w phase switching elements at the time of regeneration operation, (f) is the switching mode of both secondary side w phase switching elements at the time of regeneration operation. Time chart shown. The circuit diagram which shows the u phase stator conversion part and u phase rotor conversion part of another example. The circuit diagram which shows the u phase stator conversion part and u phase rotor conversion part of another example.

Hereinafter, an embodiment of a rotating electrical machine will be described. In FIGS. 6 and 7, for the sake of illustration, the period T is shown larger than the actual period.
As shown in FIG. 1, the rotating electrical machine 10 of this embodiment is mounted on a vehicle 100 having an engine 101 and a battery (power storage device) 102, and is used for a hybrid transaxle. The battery 102 is a DC power supply, and the stored power of the battery 102 corresponds to “power supply 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 101. The inner rotor 11 rotates when the power of the engine 101 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 u-phase rotor coil 22u, a v-phase rotor coil 22v, and a w-phase rotor coil 22w. When the inner rotor 11 rotates, the rotor coil 22 also rotates.

  The outer rotor 12 is mechanically connected to the axle 103 of the vehicle 100. For this reason, the rotational force of the outer rotor 12 is transmitted to the axle 103, and the rotational force of the axle 103 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, like the rotor coil 22. 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 three-phase 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 100 is mounted with a stator inverter 33 that converts the stored electric power of the battery 102 into a three-phase alternating current that can be driven by the second electric motor 32 and outputs it to the stator coil 27. The stator inverter 33 is fixed to the housing 14 or the vehicle 100 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 power to the first electric motor 31 using DC stored power output from the battery 102. 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 converter 43 that converts stored power into AC transmission power (AC power) having a predetermined frequency, and transmission power converted by the stator converter 43. Is transmitted to the electronic unit 42. Furthermore, the electronic unit 42 includes a rotor conversion unit 45 that converts transmission power into three-phase AC that can be driven by the first electric motor 31 without using DC power. 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.

Here, the electric field coupling type non-contact power feeding system 40 of the present embodiment includes phase power feeding units 41u to 41w that individually feed power to the phase rotor coils 22u to 22w.
The u-phase power feeding section 41u feeds power to the u-phase rotor coil 22u using electric field coupling type non-contact power transmission via both u-phase coupling capacitors Cu1 and Cu2. The u-phase power feeding unit 41u includes a u-phase stator conversion unit (u-phase first conversion unit) 43u provided in the stator conversion unit 43, a u-phase transmission unit 44u provided in the non-contact power transmission unit 44, and a rotor conversion. And a u-phase rotor converter (u-phase second converter) 45u provided in the unit 45.

  The v-phase power feeding section 41v feeds power to the v-phase rotor coil 22v using electric field coupling type non-contact power transmission via both v-phase coupling capacitors Cv1 and Cv2. The v-phase power feeding unit 41v includes a v-phase stator conversion unit (v-phase first conversion unit) 43v provided in the stator conversion unit 43, a v-phase transmission unit 44v provided in the non-contact power transmission unit 44, and a rotor conversion. And a v-phase rotor conversion section (v-phase second conversion section) 45v provided in the section 45.

  The w-phase power feeding unit 41w feeds the w-phase rotor coil 22w using electric field coupling type non-contact power transmission via both w-phase coupling capacitors Cw1 and Cw2. The w-phase power feeding unit 41w includes a w-phase stator conversion unit (w-phase first conversion unit) 43w provided in the stator conversion unit 43, a w-phase transmission unit 44w provided in the non-contact power transmission unit 44, and a rotor conversion. And a w-phase rotor converter (w-phase second converter) 45w provided in the unit 45.

  Detailed configurations of the electronic unit 42 and the non-contact power transmission unit 44 will be described. In addition, since the structure of each phase transmission part 44u-44w is fundamentally the same, in the following description, u phase transmission part 44u is demonstrated in detail, and description of the other phase transmission parts 44v and 44w is abbreviate | omitted.

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

  The u-phase rotating electrodes 61u and 62u are cylindrically fixed to the outer peripheral surface of the insulating member 52, and the axial direction of the u-phase rotating electrodes 61u and 62u and the axial direction of the inner rotor 11 are the same. Incidentally, both u-phase rotating electrodes 61u and 62u are arranged apart from each other in the axial direction of the inner rotor 11.

  Both u-phase holding electrodes 71u and 72u have a cylindrical shape (in detail, a cylindrical shape) having an inner diameter longer than that of the u-phase rotating electrodes 61u and 62u. The u-phase holding electrodes 71u and 72u are arranged at positions where they are electrically coupled to the u-phase rotating electrodes 61u and 62u. Specifically, the first u-phase holding electrode 71u is opposed to the first u-phase rotating electrode 61u in the radial direction of the inner rotor 11, and the second u-phase holding electrode 72u is formed between the second u-phase rotating electrode 62u and the inner rotor 11. Opposing in the radial direction.

  The non-contact power transmission unit 44 includes a holding member 80 for holding both u-phase holding electrodes 71 u and 72 u in the housing 14. The holding member 80 has, for example, a cylindrical shape having the same inner diameter as the inner diameters of both u-phase holding electrodes 71u and 72u, 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. U-phase grooves 81 u and 82 u that are recessed from the inner peripheral surface are formed at positions that oppose the u-phase rotating electrodes 61 u and 62 u in the radial direction on the inner peripheral surface of the holding member 80. The u-phase holding electrodes 71u and 72u are fixed to the holding member 80 in a state of being fitted into the u-phase grooves 81u and 82u. As a result, both u-phase holding electrodes 71u and 72u are prevented from rotating as the inner rotor 11 rotates. The rotating electrical machine 10 also includes a u-phase stator side wiring 83u that electrically connects both u-phase holding electrodes 71u and 72u and the u-phase stator converter 43u.

  According to this configuration, the first u-phase coupling capacitor Cu1 is configured by the first u-phase rotating electrode 61u and the first u-phase holding electrode 71u that are electrically coupled, and the second u-phase rotating electrode 62u and the second u-phase that are electrically coupled. The holding electrode 72u constitutes the second u-phase coupling capacitor Cu2. The electric power for transmission can be transmitted between the rotating electronic unit 42 and the non-rotating u-phase stator converter 43u via these u-phase coupling capacitors Cu1 and Cu2.

  When transmission power is input from the u-phase stator converter 43u to the u-phase holding electrodes 71u and 72u via the u-phase stator side wiring 83u, the u-phase holding electrodes 71u and 72u are connected to the u-phase rotating electrodes 61u, It functions as a “power transmission unit” that transmits power for transmission to 62u. Then, both u-phase rotating electrodes 61u and 62u function as “power receiving units” that receive transmission power from both u-phase holding electrodes 71u and 72u in a non-contact manner.

  Although not shown in the figure, similarly to the u-phase transmission unit 44u, the v-phase transmission unit 44v is provided on the inner rotor 11 and two v-phase holding electrodes connected to the v-phase stator conversion unit 43v. The phase-holding electrode and two v-phase rotating electrodes arranged opposite to each other are included, and the v-phase coupling capacitors Cv1 and Cv2 are constituted by the v-phase holding electrode and the v-phase rotating electrode. The w-phase transmission unit 44w includes two w-phase holding electrodes connected to the w-phase stator conversion unit 43w, and two w-phase rotating electrodes provided on the inner rotor 11 and arranged to face the w-phase holding electrode. The w-phase coupling capacitors Cw1 and Cw2 are constituted by the w-phase holding electrode and the w-phase rotating electrode. The v-phase transmission unit 44v and the w-phase transmission unit 44w are arranged to be separated from the u-phase transmission unit 44u in the axial direction of the rotation shaft 51.

  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.

  The rotor conversion unit 45 is mounted on the circuit board 91 and is electrically connected to the non-contact power transmission unit 44. Specifically, the insulating member 52 includes a first u-phase bus bar 92au in contact with the first u-phase rotating electrode 61u of the u-phase transmission unit 44u and a second u-phase bus bar 92bu in contact with the second u-phase rotating electrode 62u. And are buried. Both u-phase bus bars 92 au and 92 bu 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 u-phase bus bars 92 au and 92 bu are connected to the u-phase rotor converter 45 u of the rotor converter 45. As a result, the transmission power transmitted via both u-phase coupling capacitors Cu1 and Cu2 is input to the u-phase rotor converter 45u via both u-phase bus bars 92au and 92bu.

  Although not shown, the v-phase transmission unit 44v and the v-phase rotor conversion unit 45v are electrically connected via a v-phase bus bar embedded in the insulating member 52, and the w-phase transmission unit 44w The w-phase rotor conversion unit 45w is electrically connected through a w-phase bus bar embedded in the insulating member 52.

  The rotor conversion unit 45 is electrically connected to the rotor coil 22 via a plurality of wirings 93 embedded in the insulating member 52. Specifically, the u-phase rotor converter 45u is electrically connected to the u-phase rotor coil 22u via the u-phase wire 93u, and the v-phase rotor converter 45v is connected to the v-phase via the v-phase wire 93v. The w-phase rotor conversion unit 45w is electrically connected to the w-phase rotor coil 22w via the w-phase wiring 93w.

Further, the electronic unit 42 includes a rotor controller 94 that controls the rotor conversion unit 45. The rotor controller 94 is mounted on the circuit board 91.
Although illustration is omitted, in practice, the rotating electrical machine 10 includes a power supply unit that supplies operating power to the rotor controller 94. The power supply unit supplies power via a coupling capacitor formed by, for example, a rotating electrode provided on the inner rotor 11 and a holding electrode fixed to the housing 14 at a position facing the rotating electrode. The power supply of the operating power to the rotor controller 94 may be constantly performed, or may be performed from a stage before necessary processing (for example, before starting the power running operation).

  As shown in FIG. 1, the electric field coupling type non-contact power feeding system 40 includes a stator controller 95 that controls the stator inverter 33 and controls the stator converter 43. The stator controller 95 is fixed to the housing 14 or the vehicle 100 so as not to rotate with the rotation of the rotors 11 and 12. The stator controller 95 may be integrated with the rotating electrical machine 10 or may be a separate body.

  The rotor controller 94 and the stator controller 95 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 94 and 95 are electrically connected via both signal coupling capacitors Cz1 and Cz2. In FIG. 2, the signal coupling capacitors Cz1 and Cz2 are not shown. Both controllers 94 and 95 correspond to a “control unit”.

  As shown in FIG. 3, the inner rotor 11 is provided with a rotation angle sensor (rotational position sensor) 96 that detects the rotation angle of the inner rotor 11. The rotation angle sensor 96 is, for example, a resolver. The rotation angle sensor 96 transmits the detection result to the rotor controller 94. Thereby, the rotor controller 94 can grasp the rotation angle and the rotation speed of the inner rotor 11. Further, the rotor controller 94 transmits these pieces of information to the stator controller 95 as necessary.

  Here, the stator controller 95 is configured to be able to grasp the operation state of the accelerator and the brake and the traveling state of the vehicle 100 in addition to the rotation speed and the rotation angle of the inner rotor 11. Then, based on these situations, the stator controller 95 performs a power running operation that drives the first electric motor 31 using the stored power of the battery 102, or uses the regenerative power generated by the first electric motor 31. It is determined whether to perform a regenerative operation for charging the battery 102. Then, the stator controller 95 performs the determined operation in cooperation with the rotor controller 94.

Hereinafter, the power running operation and the regenerative operation will be described together with the detailed description of the electrical configuration of the rotating electrical machine 10 (specifically, the electric field coupling type non-contact power feeding system 40).
First, the electrical configuration of the rotating electrical machine 10 will be described with reference to FIG. In the rotating electrical machine 10 of the present embodiment, in terms of an equivalent circuit, a stator conversion unit 43, a non-contact power transmission unit 44, and a rotor conversion unit 45 are sequentially provided from the battery 102 toward the rotor coil 22 of the first electric motor 31. It is the composition which was made.

  If attention is paid to the respective phase power feeding units 41u to 41w, the u-phase power feeding unit 41u is connected to the battery 102 and the u-phase rotor coil 22u, and the v-phase power feeding unit 41v is connected to the battery 102 and the v-phase rotor coil 22v. The w-phase power feeding section 41w is connected to the battery 102 and the w-phase rotor coil 22w. In addition, each phase rotor coil 22u-22w of this embodiment is delta-connected.

Here, the electrical configurations of the phase power feeding units 41u to 41w are the same. For this reason, u phase electric power feeding part 41u is demonstrated in detail below as an example among each phase electric power feeding parts 41u-41w.
The u-phase stator converter 43u and the u-phase rotor converter 45u of the u-phase power feeding unit 41u are electrically connected via both u-phase coupling capacitors Cu1 and Cu2. The u-phase stator conversion unit 43u is provided between the battery 102 and both u-phase coupling capacitors Cu1 and Cu2, performs a DC / AC conversion operation for converting the stored power of the battery 102 into transmission power, and The transmission power is output to the u-phase holding electrodes 71u and 72u of both u-phase coupling capacitors Cu1 and Cu2.

  The u-phase stator converter 43u includes a primary-side u-phase coil Lu1 connected in series to the battery 102 and a primary-side u that is connected in parallel to the battery 102 and capable of switching between bidirectional power conduction and power interruption. Phase bidirectional switch circuit 97u and primary side u phase shunt capacitor Csu1 connected in parallel to primary side u phase bidirectional switch circuit 97u. The primary-side u-phase bidirectional switch circuit 97u is provided in a subsequent stage (specifically, on both u-phase coupling capacitors Cu1 and Cu2 side) with respect to the primary-side u-phase coil Lu1. The primary-side u-phase shunt capacitor Csu1 is provided at a subsequent stage with respect to the primary-side u-phase bidirectional switch circuit 97u. That is, the primary-side u-phase shunt capacitor Csu1 is provided between the primary-side u-phase coil Lu1 and both u-phase coupling capacitors Cu1 and Cu2.

  The primary-side u-phase bidirectional switch circuit 97u includes two primary-side u-phase switching elements Qu1 and Qu2 connected in series with each other. Both primary-side u-phase switching elements Qu1 and Qu2 are composed of, for example, n-type power MOSFETs. The drains of both primary-side u-phase switching elements Qu1 and Qu2 are connected to each other. The source of the first primary u-phase switching element Qu1 is connected to the + terminal of the battery 102 via the primary u-phase coil Lu1, and the source of the second primary u-phase switching element Qu2 is the battery. 102 is connected to the negative terminal.

  Further, the primary side u-phase switching elements Qu1 and Qu2 have primary side u-phase body diodes (parasitic diodes) Dbu1 and Dbu2 connected between the source and the drain. Both primary-side u-phase body diodes Dbu1, Dbu2 are opposite to each other. The primary-side u-phase bidirectional switch circuit 97u can flow current in either direction when both primary-side u-phase switching elements Qu1 and Qu2 are in the ON state. When the switching elements Qu1 and Qu2 are in the OFF state, the current does not flow regardless of which direction the voltage is applied.

  The u-phase rotor converter 45u is provided between both u-phase coupling capacitors Cu1 and Cu2 and the u-phase rotor coil 22u. The u-phase rotor converter 45u converts the transmission power received by the u-phase rotating electrodes 61u and 62u of both u-phase coupling capacitors Cu1 and Cu2 into the u-phase among the three-phase alternating currents that can be driven by the first electric motor 31. An AC / AC conversion operation for directly converting to the corresponding drive power is performed, and the drive power corresponding to the u phase is output to the u phase rotor coil 22u.

  The u-phase rotor converter 45u has a circuit configuration symmetrical to the u-phase stator converter 43u via both u-phase coupling capacitors Cu1 and Cu2. Specifically, the u-phase rotor conversion unit 45u includes a secondary u-phase coil Lu2 connected in series to the u-phase rotor coil 22u, a parallel connection to the u-phase rotor coil 22u, and bidirectional power conduction and power interruption. Can be switched, and a secondary u-phase shunt capacitor Csu2 connected in parallel to the secondary u-phase bidirectional switch circuit 98u. The secondary u-phase coil Lu2 is provided upstream of the u-phase rotor coil 22u (specifically, on both u-phase coupling capacitors Cu1 and Cu2 side). The secondary-side u-phase bidirectional switch circuit 98u is provided in front of the secondary-side u-phase coil Lu2. Secondary-side u-phase shunt capacitor Csu2 is provided at a stage prior to secondary-side u-phase bidirectional switch circuit 98u. That is, the secondary-side u-phase shunt capacitor Csu2 is provided between the secondary-side u-phase coil Lu2 and both u-phase coupling capacitors Cu1 and Cu2, and through the both u-phase coupling capacitors Cu1 and Cu2, 1 The secondary side u-phase shunt capacitor Csu1 is connected in parallel.

  The secondary-side u-phase bidirectional switch circuit 98u includes two secondary-side u-phase switching elements Qu3 and Qu4 connected in series with each other. Both secondary-side u-phase switching elements Qu3 and Qu4 are configured by, for example, n-type power MOSFETs. The drains of both secondary-side u-phase switching elements Qu3 and Qu4 are connected to each other. The source of the first secondary-side u-phase switching element Qu3 is connected to one end of the u-phase rotor coil 22u via the secondary-side u-phase coil Lu2, and the source of the second secondary-side u-phase switching element Qu4 Is connected to the other end opposite to the one end of the u-phase rotor coil 22u.

  The secondary u-phase switching elements Qu3 and Qu4 include secondary u-phase body diodes (parasitic diodes) Dbu3 and Dbu4 connected between the source and the drain. Both secondary side u-phase body diodes Dbu3 and Dbu4 are opposite to each other. The secondary-side u-phase bidirectional switch circuit 98u allows current to flow in either direction when both secondary-side u-phase switching elements Qu3 and Qu4 are in the ON state. When the switching elements Qu3 and Qu4 are in the OFF state, the current does not flow regardless of which direction the voltage is applied.

  Further, the electric field coupling type non-contact power feeding system 40 is connected in series to the first u-phase coupling capacitor Cu1 separately from both u-phase coils Lu1 and Lu2, and cooperates with the first u-phase coupling capacitor Cu1 to form the u-phase. A u-phase resonance coil Lu3 constituting the series resonance circuit 99u is provided. The u-phase resonance coil Lu3 is provided between both u-phase shunt capacitors Csu1 and Csu2. Specifically, the u-phase resonance coil Lu3 is provided on the wiring that connects the primary-side u-phase coil Lu1 and the first u-phase holding electrode 71u. In the present embodiment, the u-phase stator converter 43u has a u-phase resonance coil Lu3.

  According to such a configuration, the u-phase switching elements Qu1 to Qu4 are periodically turned on / off, thereby enabling power transmission (in other words, feeding) from the battery 102 to the u-phase rotor coil 22u. , Power transmission from the u-phase rotor coil 22u to the battery 102 is possible. That is, the u-phase power feeding unit 41u of the present embodiment can perform bidirectional non-contact power transmission via both u-phase coupling capacitors Cu1 and Cu2. In addition, it can be said that the ON state of each u-phase switching element Qu1-Qu4 is a conduction | electrical_connection state, and it can be said that an OFF state is a interruption | blocking state (non-conduction state).

  Here, the u-phase stator converter 43u and the u-phase series resonance circuit 99u constitute a u-phase E-class inverter Eiu that converts stored power into transmission power through a class E operation. The u-phase series resonance circuit 99u and the u-phase rotor conversion unit 45u constitute a u-phase E class converter Ecu 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 u-phase series resonance circuit 99u that functions as part of both the u-phase E class inverter Eiu and the u-phase E class converter Ecu.

  The power value of the transmission power is set such that one phase can be generated from the three-phase AC that can be driven by the first electric motor 31. In this case, the capacitances of both u-phase coupling capacitors Cu1 and Cu2 are set corresponding to the frequency and voltage value of the transmission power so that the transmission power can be transmitted. Further, the capacitances of both u-phase shunt capacitors Csu1, Csu2 and the inductances of the u-phase coils Lu1, Lu2, Lu3 are set corresponding to the capacitances of both u-phase coupling capacitors Cu1, Cu2 so as to satisfy the class E operation condition. Has been. The class E operation condition is a condition in which the applied voltage of each u-phase switching element Qu1 to Qu4 is “0” and the slope of the applied voltage waveform is “0” when each u-phase switching element Qu1 to Qu4 is turned on. .

  The capacitances of both u-phase coupling capacitors Cu1 and Cu2 are the lengths of the u-phase rotating electrodes 61u and 62u and u-phase holding electrodes 71u and 72u in the axial direction, the diameters of the u-phase rotating electrodes 61u and 62u, and the u-phase holding electrodes. It is determined based on the ratio of the diameters of 71u and 72u. In this case, if the capacitance of both u-phase coupling capacitors Cu1 and Cu2 is to be increased, the u-phase transmission unit 44u tends to be large.

  Similarly to the u-phase stator converter 43u, the v-phase stator converter 43v of the v-phase power feeder 41v includes a primary v-phase coil Lv1, a primary v-phase bidirectional switch circuit 97v, and a primary v-phase. A shunt capacitor Csv1. The primary-side v-phase bidirectional switch circuit 97v includes primary-side v-phase switching elements Qv1 and Qv2 having primary-side v-phase body diodes Dbv1 and Dbv2. Similarly to the u-phase rotor conversion unit 45u, the v-phase rotor conversion unit 45v of the phase power feeding unit 41v includes a secondary-side v-phase coil Lv2, a secondary-side v-phase bidirectional switch circuit 98v, and a secondary-side v-phase shunt. And a capacitor Csv2. The secondary-side v-phase bidirectional switch circuit 98v includes secondary-side v-phase switching elements Qv3 and Qv4 having secondary-side v-phase body diodes Dbv3 and Dbv4. The v-phase power feeding unit 41v includes a v-phase resonance coil Lv3 that forms a v-phase series resonance circuit 99v in cooperation with the first v-phase coupling capacitor Cv1. The v-phase series resonance circuit 99v and the v-phase stator converter 43v constitute a v-phase E class inverter Eiv, and the v-phase series resonance circuit 99v and the v-phase rotor converter 45v constitute a v-phase E class converter Ecv. Yes. These configurations are the same as the corresponding configurations of the u-phase power feeding unit 41u.

  Similarly, the w-phase stator conversion unit 43w of the w-phase power feeding unit 41w is similar to the u-phase stator conversion unit 43u in that the primary-side w-phase coil Lw1, the primary-side w-phase bidirectional switch circuit 97w, and the primary A side w-phase shunt capacitor Csw1 is provided. The primary-side w-phase bidirectional switch circuit 97w includes primary-side w-phase switching elements Qw1 and Qw2 having primary-side w-phase body diodes Dbw1 and Dbw2. Similarly to the u-phase rotor conversion unit 45u, the w-phase rotor conversion unit 45w of the phase power feeding unit 41w includes a secondary side w-phase coil Lw2, a secondary side w-phase bidirectional switch circuit 98w, and a secondary side w-phase shunt. And a capacitor Csw2. The secondary-side w-phase bidirectional switch circuit 98w includes secondary-side w-phase switching elements Qw3 and Qw4 having secondary-side w-phase body diodes Dbw3 and Dbw4. The w-phase power feeding unit 41w includes a w-phase resonance coil Lw3 that forms a w-phase series resonance circuit 99w in cooperation with the first w-phase coupling capacitor Cw1. The w-phase series resonance circuit 99w and the w-phase stator converter 43w constitute a w-phase E class inverter Eiw, and the w-phase series resonance circuit 99w and the w-phase rotor converter 45w constitute a w-phase E class converter Ecw. Yes. These configurations are the same as the corresponding configurations of the u-phase power feeding unit 41u.

  The stator controller 95 includes both primary-side u-phase switching elements Qu1 and Qu2, both primary-side v-phase switching elements Qv1 and Qv2, and both primary-side w-phase switching elements Qw1 and Qw2 (hereinafter referred to as “primary side”). Each phase E class inverter Eiu-Eiw is operated by controlling the switching elements Qu1-Qw2.

  The rotor controller 94 includes both secondary-side u-phase switching elements Qu3 and Qu4, both secondary-side v-phase switching elements Qv3 and Qv4, and both secondary-side w-phase switching elements Qw3 and Qw4 (hereinafter referred to as “secondary-side switching”). The respective phase E class converters Ecu to Ecw are operated by controlling the elements Qu3 to Qw4).

Here, the details of the switching control of the u-phase switching elements Qu1 to Qu4 in both controllers 94 and 95 will be described below.
The stator controller 95 operates the u-phase E class inverter Eiu by periodically turning on and off both primary-side u-phase switching elements Qu1 and Qu2 using a clock signal CK that periodically switches to HI / LOW. .

  Incidentally, the stator controller 95 simultaneously turns ON / OFF both primary-side u-phase switching elements Qu1 and Qu2. That is, the switching modes of both primary-side u-phase switching elements Qu1 and Qu2 are synchronized. In other words, the switching waveforms of both primary-side u-phase switching elements Qu1 and Qu2 are the same.

  Further, the stator controller 95 transmits the clock signal CK to the rotor controller 94. In this case, the clock signal CK is differentiated when transmitting the signal coupling capacitors Cz1 and Cz2. For this reason, the rotor controller 94 receives the differential waveform of the clock signal CK. On the other hand, the rotor controller 94 has a circuit that generates (restores) the clock signal CK from the differential waveform of the clock signal CK. Thereby, the rotor controller 94 can grasp the clock signal CK.

  Based on the clock signal CK, the rotor controller 94 delays both secondary-side u-phase switching elements Qu3 and Qu4 periodically ON / OFF by delaying both primary-side u-phase switching elements Qu1 and Qu2 by a delay time Td. As a result, the u-phase E-class converter Ecu is operated. In this case, the rotor controller 94 turns ON / OFF both the secondary side u-phase switching elements Qu3 and Qu4 simultaneously. That is, the switching modes of both secondary u-phase switching elements Qu3 and Qu4 are synchronized. In other words, the switching waveforms of both secondary-side u-phase switching elements Qu3, Qu4 are the same.

  Here, the switching frequencies of the u-phase switching elements Qu1 to Qu4 are the same, and specifically the same as the frequency of the clock signal CK. The on / off duty ratios of the u-phase switching elements Qu1 to Qu4 are the same. For this reason, as shown in FIGS. 4A and 4B, each of the u-phase switching elements Qu1 to Qu4 is arranged on both secondary sides with respect to the rising timing of both primary-side u-phase switching elements Qu1 and Qu2. The u-phase switching elements Qu3 and Qu4 are turned on / off at the same cycle T with the rising timing delayed by the delay time Td. The period T corresponds to the switching period of the u-phase switching elements Qu1 to Qu4.

  Incidentally, the switching frequency of each of the u-phase switching elements Qu1 to Qu4 matches the frequency of the transmission power. The switching frequency (in other words, the frequency of transmission power) is set to be higher than the frequency of drive power, and is set to be at least 100 times higher, for example.

Here, the inventor has found a characteristic that the power transmission direction (in other words, the feeding direction) and the power value 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, the power transmission direction, and the transmitted power value. In FIG. 5, the direction from the battery 102 toward the u-phase rotor coil 22u (first electric motor 31) is defined as a first direction, and the direction from the u-phase rotor coil 22u toward the battery 102 is defined as a second direction. 5 is a graph showing the power consumption of the battery 102 with respect to the delay time Td, and the one-dot chain load graph Pt2 in FIG. 5 is a graph of the u-phase rotor coil 22u with respect to the delay time Td. It is a graph which shows electric power consumption.

  As shown in FIG. 5, the power transmission direction differs depending on the delay time Td. Specifically, the power transmission direction is the second direction when the delay time Td is 0 to T / 2, and is the first direction when the delay time Td is T / 2 to T. When the delay time Td is T / 2, the power consumption of the battery 102 and the power consumption of the u-phase rotor coil 22u cancel each other and become “0”. In this case, power transmission is not performed in either the first direction or the second direction.

  Further, the power consumption of the battery 102 and the u-phase rotor coil 22u varies according to the delay time Td. In this case, the delay time Td that maximizes the power consumption of the battery 102 and the u-phase rotor coil 22u within the range of the delay time Td from 0 to T / 2 is defined as the first regeneration delay time Tdr1. When the delay time Td is set to the first regeneration delay time Tdr1, the power value transmitted from the u-phase rotor coil 22u toward the battery 102 is maximized.

  Further, the delay time Td in which the power consumption of the battery 102 and the u-phase rotor coil 22u is maximized within the range of the delay time Td from T / 2 to T is defined as the first power running delay time Tdp1. When the delay time Td is set to the first power running delay time Tdp1, the power value transmitted from the battery 102 toward the u-phase rotor coil 22u is maximized.

  When delay time Td is 0 to T / 2, the power consumption of battery 102 is smaller than the power consumption of u-phase rotor coil 22u. The difference between the two indicates a loss in power transmission from the u-phase rotor converter 45u to the u-phase stator converter 43u including non-contact power transmission via both u-phase coupling capacitors Cu1 and Cu2.

  When delay time Td is T / 2 to T, the power consumption of u-phase rotor coil 22u is smaller than the power consumption of battery 102. The difference between the two indicates a loss of power transmission from the u-phase stator converter 43u to the u-phase rotor converter 45u including non-contact power transmission via both u-phase coupling capacitors Cu1 and Cu2.

  Note that the power consumption of the battery 102 is power consumption due to discharging when the power transmission direction is the first direction, and power consumption due to charging when the power transmission direction is the second direction.

  The power consumption of the u-phase rotor coil 22u is the power consumption related to driving the first electric motor 31 when the power transmission direction is the first direction, and when the power transmission direction is the second direction. Is the power consumption by the output regenerative power.

  The stator controller 95 of the present embodiment causes the DC power to flow by periodically changing the delay time Td of both the secondary u-phase switching elements Qu3 and Qu4 with respect to both the primary u-phase switching elements Qu1 and Qu2. Rather, bidirectional AC / AC conversion operation between the transmission power and the drive power corresponding to the u phase is performed.

  Specifically, both primary-side u-phase switching elements Qu1 and Qu2 and both secondary-side u-phase switching elements Qu3 and Qu4 are periodically turned on / off with delay time Td set to first powering delay time Tdp1. The operation to turn off is the u-phase first powering operation. The first power running delay time Tdp1 is a delay time Td in which the power transmission direction is the first direction and a forward (in other words, positive direction) current flows through the u-phase rotor coil 22u.

  Also, both primary-side u-phase switching elements Qu1 and Qu2 and both secondary-side u-phase switching elements Qu3 and Qu4 are periodically turned ON / OFF in a state where the delay time Td is set to the second powering delay time Tdp2. The operation is a u-phase second powering operation. The second powering delay time Tdp2 is a value obtained by subtracting T / 2 from the first powering delay time Tdp1. The second power running delay time Tdp2 is a delay time Td in which the power transmission direction is the first direction and the current in the reverse direction (in other words, the negative direction) flows in the u-phase rotor coil 22u. That is, the delay time Td includes the first power running delay time Tdp1 and the second power running delay time Tdp2 in which the power transmission direction is the first direction and the direction of the current flowing through the u-phase rotor coil 22u is different.

  In such a configuration, as shown in FIGS. 6 (a) and 6 (b), both controllers 94 and 95 repeatedly execute the u-phase first power running operation and the u-phase second power running operation alternately during the power running operation. As described above, the u-phase switching elements Qu1 to Qu4 are periodically turned ON / OFF. As a result, the u-phase E-class inverter Eiu (specifically, the u-phase stator converter 43u) performs a DC / AC conversion operation for converting the stored power into the transmission power, and the u-phase E-class converter Ecu (specifically, In the u-phase rotor conversion unit 45u), an AC / AC conversion operation for converting transmission power into drive power is performed, and AC drive power corresponding to the u-phase is generated.

  Specifically, as shown in FIG. 6C, a forward current related to the driving power is generated by the u-phase first powering operation, and a reverse current related to the driving power is generated by the u-phase second powering operation. Is generated. In this case, the first power running delay time Tdp1 is a delay time Td corresponding to the forward current of the drive power, and the second power running delay time Tdp2 can also be said to be a delay time Td corresponding to the current in the reverse direction of the drive power. . Note that if the u-phase first powering operation and the u-phase second powering operation are combined to form a u-phase unit powering operation, it can be said that both controllers 94 and 95 repeatedly execute the u-phase unit powering operation.

  That is, the u-phase rotor conversion unit 45u is periodically turned on / off in a state where both secondary-side u-phase switching elements Qu3 and Qu4 are delayed by a delay time Td with respect to both primary-side u-phase switching elements Qu1 and Qu2. Thus, electric power is output to the u-phase rotor coil 22u, and the direction of the current flowing through the u-phase rotor coil 22u is switched according to the delay time Td.

The above-described switching control shifted by the delay time Td and the characteristics of the power transmission direction with respect to the delay time Td are not limited to the u phase, and the same applies to the v phase and the w phase.
That is, the operation in which both primary-side v-phase switching elements Qv1 and Qv2 and both secondary-side v-phase switching elements Qv3 and Qv4 are periodically turned on / off in a state shifted by the first power running delay time Tdp1. One power running operation is assumed. Then, the operation of periodically turning ON / OFF both primary-side v-phase switching elements Qv1, Qv2 and both secondary-side v-phase switching elements Qv3, Qv4 by the second power running delay time Tdp2 is performed. Two power running operations are assumed.

  Then, as shown in FIGS. 6D and 6E, the controllers 94 and 95 perform the v-phase first power running operation and the v-phase second power running operation alternately and repeatedly during the power running operation. The v-phase switching elements Qv1 to Qv4 are periodically turned ON / OFF. Thereby, as shown in FIG.6 (f), the electric current of the alternating current drive power corresponding to v phase among three-phase alternating current is produced | generated. If the v-phase first powering operation and the v-phase second powering operation are combined to form a v-phase unit powering operation, it can be said that both controllers 94 and 95 repeatedly execute the v-phase unit powering operation.

  Similarly, the operation in which both primary-side w-phase switching elements Qw1 and Qw2 and both secondary-side w-phase switching elements Qw3 and Qw4 are periodically turned on / off in a state shifted by the first power running delay time Tdp1 is performed in the w-phase. The first power running operation is assumed. Then, the operation in which both primary side w-phase switching elements Qw1, Qw2 and both secondary side w-phase switching elements Qw3, Qw4 are periodically turned on / off in a state shifted by the second power running delay time Tdp2 is performed. Two power running operations are assumed.

  6 (g) and FIG. 6 (h), the controllers 94 and 95 are configured to repeatedly execute the w-phase first power running operation and the w-phase second power running operation alternately during the power running operation. The w-phase switching elements Qw1 to Qw4 are periodically turned ON / OFF. As a result, as shown in FIG. 6 (i), an AC driving power current corresponding to the w phase of the three-phase AC is generated. If the w-phase first powering operation and the w-phase second powering operation are combined to form a w-phase unit powering operation, it can be said that both controllers 94 and 95 repeatedly execute the w-phase unit powering operation.

  In the present embodiment, the unit power running operation period Ta that is the execution period of each phase unit power running operation is set to be the same. In each phase first power running operation, the execution period (hereinafter referred to as the first power running operation period Ta1) and the delay time Td are set to be the same. In each phase second powering operation, the execution period (hereinafter referred to as the second powering operation period Ta2) and the delay time Td are set to be the same. That is, the operation mode of each phase unit power running operation is the same.

  Both the controllers 94 and 95 control the unit power running operation period Ta and the unit power running operation frequency ft which is the reciprocal number of the unit power running operation period Ta in accordance with the rotational speed of the inner rotor 11. Specifically, both controllers 94 and 95 control the unit power running operation frequency ft so that the unit power running operation frequency ft is equal to the rotational speed of the inner rotor 11. For example, both controllers 94 and 95 increase the unit power running operating frequency ft as the rotational speed of the inner rotor 11 increases. Both controllers 94 and 95 maintain the unit power running operation frequency ft when the rotational speed of the inner rotor 11 becomes constant. Thereby, the energization mode of the u-phase rotor coil 22u and the inner rotor 11 are synchronized. Incidentally, the unit power running operation frequency ft is the frequency of the driving power of each phase.

  As shown in FIG. 6, during the power running operation, both controllers 94 and 95 set the execution timing of the u-phase unit power running operation, the execution timing of the v-phase unit power running operation, and the execution timing of the w-phase unit power running operation for a predetermined period. Shift one by one. The execution timing of the u-phase unit powering operation can also be said to be the execution timing of the u-phase first powering operation, and the execution timing of the v-phase unit powering operation can also be said to be the execution timing of the v-phase first powering operation. Can also be said to be the execution timing of the w-phase first power running operation. The execution timing can also be said to be the operation start timing.

  Specifically, the controllers 94 and 95 control the phase power feeding units 41u to 41w so that each phase unit power running operation is shifted by 1/3 of the unit power running operation period Ta. In other words, both controllers 94 and 95 shift the phase of the driving power of each phase converted by each phase rotor converter 45u to 45w by 120 degrees.

  In the present embodiment, the first powering operation period Ta1 and the second powering operation period Ta2 are set to be the same. That is, the ratio between the first powering operation period Ta1 and the second powering operation period Ta2 is “1”. However, it is not restricted to this, The said ratio is arbitrary.

  Next, the control mode of both controllers 94 and 95 during the regenerative operation will be described with reference to FIG. During the regenerative operation, AC regenerative power is generated in each phase rotor coil 22u to 22w.

  During the regenerative operation, the controllers 94 and 95 periodically turn on / off the switching elements Qu1 to Qw4 and change the delay time Td based on the rotation angle of the inner rotor 11, thereby generating AC regenerative power. Then, an AC / AC conversion operation for converting to a transmission power having a frequency higher than the frequency of the regenerative power is performed.

For convenience of explanation, the u phase will be described first.
In the state where the delay time Td is set to the first regeneration delay time Tdr1, the both primary-side u-phase switching elements Qu1 and Qu2 and both the secondary-side u-phase switching elements Qu3 and Qu4 are periodically turned ON / OFF. The u-phase first regeneration operation is performed. The first regeneration delay time Tdr1 is a delay time Td in which the power transmission direction is the second direction, the first u-phase coupling capacitor Cu1 side has a positive potential, and the second u-phase coupling capacitor Cu2 side has a negative potential.

  Further, both primary-side u-phase switching elements Qu1 and Qu2 and both secondary-side u-phase switching elements Qu3 and Qu4 are periodically turned ON / OFF in a state where the delay time Td is set to the second regeneration delay time Tdr2. The operation is the u-phase second regeneration operation. The second regeneration delay time Tdr2 is a value obtained by adding T / 2 to the first regeneration delay time Tdr1. The second regeneration delay time Tdr2 is a delay time Td in which the power transmission direction is the second direction, the first u-phase coupling capacitor Cu1 side has a negative potential, and the second u-phase coupling capacitor Cu2 side has a positive potential. That is, the delay time Td includes the first regeneration delay time Tdr1 and the second regeneration delay time Tdr2 in which the power transmission direction is the second direction and the voltage application direction is different.

  The u-phase first regenerative operation and the u-phase second regenerative operation are combined into a u-phase unit regenerative operation, and the reciprocal of the unit regenerative operation period Tr that is the execution period of the u-phase unit regenerative operation is set as the unit regenerative operation frequency fr. To do. The unit regeneration operation period Tr is a period in which the execution phase Tr1 of the u-phase first regeneration operation and the execution period Tr2 of the u-phase second regeneration operation are combined.

  In such a configuration, the rotor controller 94 determines the timing at which the application direction of the regenerative power voltage generated in the u-phase rotor coil 22u is switched based on the detection result of the rotation angle sensor 96, for example, the first u-phase coupling capacitor Cu1 side has a negative potential. The timing for switching from to positive potential and the frequency of regenerative power are grasped. Then, as shown in FIGS. 7A and 7B, the controllers 94 and 95 are configured such that the timing at which the first u-phase coupling capacitor Cu1 side switches from the negative potential to the positive potential and the start timing of the u-phase first regenerative operation. Are synchronized, and the u-phase first regenerative operation and the u-phase second regenerative operation are alternately and repeatedly executed in a state where the unit regenerative operation frequency fr matches the regenerative power frequency.

  Similarly, in each of the v-phase switching elements Qv1 to Qv4, operations corresponding to the u-phase first regeneration operation and the u-phase second regeneration operation are referred to as a v-phase first regeneration operation and a v-phase second regeneration operation. Based on the detection result of the rotation angle sensor 96, the rotor controller 94 switches the application direction of the regenerative power voltage generated in the v-phase rotor coil 22v, specifically, the first v-phase coupling capacitor Cv1 side is positive from the negative potential. Know when to switch to potential.

  Then, as shown in FIGS. 7C and 7D, the controllers 94 and 95 are configured so that the first v-phase coupling capacitor Cv1 side switches from the negative potential to the positive potential and the start timing of the v-phase first regenerative operation. Are synchronized, and the v-phase first regenerative operation and the v-phase second regenerative operation are alternately executed in a state where the unit regenerative operation frequency fr matches the frequency of the regenerative power.

  In each of the w-phase switching elements Qw1 to Qw4, operations corresponding to the u-phase first regeneration operation and the u-phase second regeneration operation are referred to as a w-phase first regeneration operation and a w-phase second regeneration operation. Based on the detection result of the rotation angle sensor 96, the rotor controller 94 switches the application direction of the regenerative power voltage generated in the w-phase rotor coil 22w, specifically, the first w-phase coupling capacitor Cw1 side is positive from the negative potential. Know when to switch to potential.

  Then, as shown in FIGS. 7E and 7F, the controllers 94 and 95 are configured so that the first w-phase coupling capacitor Cw1 side switches from the negative potential to the positive potential and the start timing of the w-phase first regenerative operation. Are synchronized, and the w-phase first regenerative operation and the w-phase second regenerative operation are alternately executed in a state where the unit regenerative operation frequency fr matches the frequency of the regenerative power.

  According to such a configuration, power is supplied to the battery 102 using regenerative power in each phase power feeding unit 41u to 41w. Specifically, AC / AC conversion operation for converting regenerative power into transmission power is performed in each phase rotor converter 45u to 45w (in other words, each phase E class converter Ecu to Ecw). The transmission power is transmitted to the phase stator converters 43u to 43w (in other words, the phase E class inverters Eiu to Eiw) via the phase coupling capacitors Cu1 to Cw2, and the phase stator converters 43u to 43w. The AC / DC conversion operation for converting the transmission power into DC power is performed. In this case, both controllers 94 and 95 may variably control the power value of the transmission power according to the necessary amount of regenerative braking.

  And both controllers 94 and 95 stop the electric power feeding by each phase electric power feeding part 41u-41w based on the rotation speed of the inner rotor 11 having fallen below the predetermined lower limit. In detail, both controllers 94 and 95 maintain each switching element Qu1-Qw4 in an OFF state. Both controllers 94 and 95 stop the operations of the phase power feeding units 41u to 41w when the first electric motor 31 is idling.

  From the above, the electric field coupling type non-contact power feeding system 40 is capable of bidirectional non-contact power transmission via the phase coupling capacitors Cu1 to Cw2. When power transmission from the u-phase rotor coil 22u to the battery 102 is performed, both u-phase rotating electrodes 61u and 62u serve as “power transmission units” that transmit transmission power to both u-phase holding electrodes 71u and 72u. Both u-phase holding electrodes 71u and 72u function as “power receiving units” that receive transmission power from both u-phase rotating electrodes 61u and 62u in a non-contact manner. The same applies to the other phases.

Next, the operation of this embodiment will be described.
Power is supplied to the phase rotor coils 22u to 22w provided in the inner rotor 11 by non-contact power transmission through the phase coupling capacitors Cu1 to Cw2. In addition, when regenerative power is generated in the phase rotor coils 22u to 22w, power transmission from the phase rotor coils 22u to 22w to the battery 102 is performed including non-contact power transmission via the phase coupling capacitors Cu1 to Cw2. Battery 102 is charged.

According to the embodiment described above in detail, the following effects are obtained.
(1) The rotating electrical machine 10 includes an inner rotor 11 and a first electric motor 31 as a three-phase motor having the respective phase rotor coils 22u to 22w provided in the inner rotor 11. And the rotary electric machine 10 is provided with several phase electric power feeding part 41u-41w corresponding to several phase rotor coils 22u-22w. Specifically, the rotating electrical machine 10 uses three electric field coupling type non-contact power transmission via the phase coupling capacitors Cu1 to Cw2 to supply three phase power feeding units to the three phase rotor coils 22u to 22w. 41u-41w is provided.

  According to this configuration, non-contact power feeding to the respective phase rotor coils 22 u to 22 w provided in the inner rotor 11 is realized by the respective phase power feeding portions 41 u to 41 w. Thereby, it is possible to supply power to the inner rotor 11 without providing a brush.

  Moreover, since the phase power feeding units 41u to 41w are individually provided for the phase rotor coils 22u to 22w, by controlling the power feeding mode by the phase power feeding units 41u to 41w individually, the phase rotor coils 22u to 22w are controlled. The 22w energization mode can be individually controlled. Thereby, the 1st electric motor 31 can be driven, without providing the three-phase inverter which produces | generates a three-phase alternating current.

  In particular, in the present embodiment, since three phase power feeding units 41u to 41w are provided, the required power value required for one phase power feeding unit may be small. In detail, each phase electric power feeding part 41u-41w should just be able to feed the drive electric power for at least 1 phase. Thereby, the capacitance of each phase coupling capacitor Cu1-Cw2 can be made low.

  More specifically, in the electric field coupling type non-contact power transmission via the coupling capacitor, the power value at which the power can be transmitted increases as the capacitance of the coupling capacitor increases. For this reason, in order to drive the 1st electric motor 31, when trying to transmit big electric power, it becomes necessary to make the capacitance of a coupling capacitor high. However, since the capacitance of the coupling capacitor depends on the shape of the electrodes, the distance between the electrodes, and the like, there may be a disadvantage that an unrealistic coupling capacitor that is difficult to manufacture and arrange is required depending on the required power value. On the other hand, in the present embodiment, since the required power value required for one phase power supply unit is small, the capacitance of each of the phase coupling capacitors Cu1 to Cw2 that satisfies the required power value can be reduced. Thereby, the said inconvenience can be suppressed.

  (2) The u-phase coupling capacitors Cu1 and Cu2 are provided with u-phase holding electrodes 71u and 72u held so as not to rotate with the rotation of the inner rotor 11, and the u-phase holding electrodes 71u and 72u provided on the inner rotor 11 And u-phase rotating electrodes 61u and 62u arranged opposite to each other. Similarly, the v-phase coupling capacitors Cv1 and Cv2 are configured by a v-phase holding electrode and a v-phase rotating electrode that are arranged to face each other, and the w-phase coupling capacitors Cw1 and Cw2 are arranged to have a w-phase holding electrode that is arranged to face each other. and a w-phase rotating electrode.

  In such a configuration, the phase power feeding units 41u to 41w perform a DC / AC conversion operation for converting DC stored power output from the battery 102 which is a DC power source into AC transmission power having a predetermined frequency, And the phase stator conversion parts 43u-43w which output the said electric power for transmission to the holding electrode of each phase coupling capacitor Cu1-Cw2 are provided. Moreover, the phase electric power feeding parts 41u to 41w are provided in the inner rotor 11, and the electric power for transmission received by the rotating electrodes of the respective phase coupling capacitors Cu1 to Cw2 is included in the three-phase AC that the first electric motor 31 can drive. Phase rotor converters 45u to 45w that perform an AC / AC conversion operation for converting the corresponding phase drive power without using DC power are provided. The phase rotor converters 45u to 45w output the driving power corresponding to the converted phases to the corresponding phase rotor coils 22u to 22w.

  According to such a configuration, the stored power is converted to transmission power by the phase stator conversion units 43u to 43w, and the converted transmission power is transmitted to the inner rotor 11 via the phase coupling capacitors Cu1 to Cw2. . Then, the transmission power is converted into driving power corresponding to each phase by the respective phase rotor conversion units 45 u to 45 w provided in the inner rotor 11. Thereby, the 1st electric motor 31 can be driven using stored electric power.

  In particular, in the present embodiment, the transmission power is converted into driving power by the respective phase rotor conversion units 45u to 45w without using DC power. Thereby, since it is not necessary to provide the inner rotor 11 with a circuit for rectifying transmission power and a circuit for converting the rectified DC power into driving power, the configuration of the inner rotor 11 can be simplified. it can. In addition, a large torque can be generated by the first electric motor 31 as compared with a configuration in which half-wave DC power is output to each phase rotor coil 22u to 22w.

  (3) The u-phase stator converter 43u has two primary-side u-phase switching elements Qu1 and Qu2, and when both the primary-side u-phase switching elements Qu1 and Qu2 are periodically turned ON / OFF, DC / AC conversion operation is performed. The v-phase stator conversion unit 43v includes both primary-side v-phase switching elements Qv1 and Qv2, and the primary-side v-phase switching elements Qv1 and Qv2 are periodically turned ON / OFF, whereby DC / AC conversion is performed. Perform the action. The w-phase stator conversion unit 43w includes both primary-side w-phase switching elements Qw1 and Qw2, and the DC / AC conversion is performed when the both primary-side w-phase switching elements Qw1 and Qw2 are periodically turned on and off. Perform the action.

  The u-phase rotor converter 45u has two secondary-side u-phase switching elements Qu3 and Qu4. The u-phase rotor converter 45u is periodically turned ON / OFF in a state where both secondary u-phase switching elements Qu3 and Qu4 are delayed by a delay time Td with respect to both primary u-phase switching elements Qu1 and Qu2. Thus, power is output to the u-phase rotor coil 22u and the direction of the current flowing through the u-phase rotor coil 22u is switched according to the delay time Td. Specifically, the u-phase rotor converter 45u includes a secondary u-phase bidirectional switch circuit 98u that is connected in parallel to the u-phase rotor coil 22u and capable of bidirectional power transmission.

  The v-phase rotor conversion unit 45v and the w-phase rotor conversion unit 45w are configured in the same manner as the u-phase rotor conversion unit 45u. The rotating electrical machine 10 includes both controllers 94 and 95 for controlling the primary side switching elements Qu1 to Qw2 and the secondary side switching elements Qu3 to Qw4.

  In such a configuration, the controllers 94 and 95 are configured so that the rising timings of the secondary switching elements Qu3 to Qw4 are delayed by the delay time Td from the rising timing of the primary switching elements Qu1 to Qw2 of the same phase. The switching elements Qu1 to Qw4 are periodically turned on / off. Then, the controllers 94 and 95 periodically change the delay time Td, so that the DC / AC conversion operation of the phase stator conversion units 43u to 43w and the AC / AC conversion of the phase rotor conversion units 45u to 45w are performed. Run the action.

  According to this configuration, the phase rotor converters 45u to 45w are configured to switch the direction of the current flowing through the phase rotor coils 22u to 22w between the forward direction and the reverse direction according to the delay time Td. By changing the time Td periodically, AC driving power can be generated from the transmission power. As a result, the AC / AC conversion operation can be realized without providing a switch or the like for switching the power transmission path, so that the configuration can be simplified. Further, the AC / AC conversion operation can be realized by relatively simple control of changing the delay time Td.

  (4) The delay time Td is the first power running delay time Tdp1 in which the power transmission direction is the first direction and the forward current flows through the phase rotor coils 22u to 22w, the power transmission direction is the first direction, and The second power running delay time Tdp2 in which a current in the direction opposite to the forward direction flows through the phase rotor coils 22u to 22w. Here, the operation in which the same phases of the respective primary side switching elements Qu1 to Qw2 and the respective secondary side switching elements Qu3 to Qw4 are periodically turned ON / OFF by shifting by the first power running delay time Tdp1 is respectively performed. The first powering operation, the v-phase first powering operation, and the w-phase first powering operation are assumed. An operation in which the same phases of the respective primary side switching elements Qu1 to Qw2 and the respective secondary side switching elements Qu3 to Qw4 are shifted by ON / OFF periodically with a shift by the second powering delay time Tdp2, respectively. Operation, v-phase second powering operation, and w-phase second powering operation.

  Both controllers 94, 95 repeatedly execute the u-phase first powering operation and the u-phase second powering operation, and alternately execute the v-phase first powering operation and the v-phase second powering operation, w The switching elements Qu1 to Qw4 are controlled such that the phase first power running operation and the w phase second power running operation are alternately and repeatedly executed.

  According to such a configuration, in each phase, the first powering operation shifted by the first powering delay time Tdp1 and the second powering operation shifted by the second powering delay time Tdp2 are alternately and repeatedly executed. AC drive power corresponding to the phase is generated. Thereby, the effect (3) can be obtained.

  (5) Both controllers 94 and 95 differ in the execution timing of each phase first powering operation by a predetermined period (for example, 1/3 of the unit powering operation period Ta). Thereby, the phase of the drive power corresponding to each phase can be made different from each other relatively easily.

  (6) The controllers 94 and 95 control the unit power running operation period Ta (in other words, the unit power running operation frequency ft) that is the execution cycle of each phase unit power running operation in accordance with the rotational speed of the inner rotor 11. Thereby, rotation of the inner rotor 11 and the electricity supply mode to each phase rotor coil 22u-22w can be synchronized, and the 1st electric motor 31 can be driven suitably. Moreover, the rotation speed control of the inner rotor 11 can be performed by changing the unit power running operation period Ta.

  (7) The frequency of the transmission power is set to be higher than the unit powering operation frequency ft that is the reciprocal of the unit powering operation period Ta. According to such a configuration, the first electric motor 31 can be driven suitably, and non-contact power transmission via the phase coupling capacitors Cu1 to Cw2 can be suitably performed.

  More specifically, for example, it is conceivable to perform non-contact power transmission via the phase coupling capacitors Cu1 to Cw2 with transmission power having the same frequency as the unit power running operation frequency ft determined according to the rotational speed of the inner rotor 11. However, in the electric field coupling type non-contact power transmission via the phase coupling capacitors Cu1 to Cw2, the power value at which power transmission is possible is determined by the frequency of the transmission power and the capacitance of the phase coupling capacitors Cu1 to Cw2. For this reason, if the frequency of the transmission power is set to be the same as the unit powering operation frequency ft, the capacitance required to satisfy the required power value becomes very high.

  On the other hand, in the present embodiment, the frequency of the transmission power is set higher than the unit powering operation frequency ft. Thereby, the capacitance of each phase coupling capacitor Cu1-Cw2 for satisfy | filling a request | requirement electric power value can be made low. Therefore, it is possible to suitably transmit power for transmission of the required power value in a non-contact manner while synchronizing the rotation of the inner rotor 11 and the energization mode of the respective phase rotor coils 22u to 22w. In other words, it can be said that each phase rotor converter 45u to 45w performs frequency conversion.

  (8) The u-phase power feeding section 41u is connected in series with the first u-phase coupling capacitor Cu1 and cooperates with the first u-phase coupling capacitor Cu1 to form the u-phase series resonance circuit 99u. It has. The v-phase power feeding unit 41v includes a v-phase resonance coil Lv3 that is connected in series with the first v-phase coupling capacitor Cv1 and forms the v-phase series resonance circuit 99v in cooperation with the first v-phase coupling capacitor Cv1. Yes. The w-phase power feeding unit 41w includes a w-phase resonance coil Lw3 that is connected in series with the first w-phase coupling capacitor Cw1 and forms the w-phase series resonance circuit 99w in cooperation with the first w-phase coupling capacitor Cw1. Yes.

  Phase phase resonance circuits 99u, 99v, 99w and phase stator converters 43u, 43v, 43w constitute phase E class inverters Eiu, Eiv, Eiw that perform class E operation, and phase series resonance circuits 99u, 99v, 99w. And phase rotor converters 45u, 45v, 45w constitute phase E class converters Ecu, Ecv, Ecw that perform class E operation.

  According to such a configuration, since the power conversion operation is performed by the class E operation, the switching loss of each of the switching elements Qu1 to Qw4 can be reduced. More specifically, the class E operation is an operation mode in which the applied voltage of each switching element Qu1 to Qw4 and the gradient of the applied voltage are “0” when the switching elements Qu1 to Qw4 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 u-phase coupling capacitor Cu1, the first v-phase coupling capacitor Cv1, and the first w-phase coupling, which are indispensable components for performing electric field coupling type non-contact power transmission (in other words, feeding). Capacitor Cw1 is employed as part of phase series resonant circuits 99u, 99v, 99w. Thereby, the configuration can be simplified as compared with a configuration in which a dedicated capacitor is separately provided.

  Further, the phase series resonance circuits 99u, 99v, 99w are used for both the phase E class inverters Eiu, Eiv, Eiw and the phase E class converters Ecu, Ecv, Ecw. Therefore, the configuration can be simplified as compared with the configuration in which the dedicated series resonant circuit is provided in both the phase E class inverters Eiu, Eiv, Eiw and the phase E class converters Ecu, Ecv, Ecw.

  (9) The phase power feeding units 41u to 41w are configured to be able to feed the regenerative power generated in the first electric motor 31 to the battery 102 via the phase coupling capacitors Cu1 to Cw2. Thereby, the battery 102 can be charged using regenerative electric power.

  (10) The controllers 94 and 95 are configured so that the u-phase switching elements are repeatedly executed alternately with the u-phase first regenerative operation and the u-phase second regenerative operation in accordance with the rotational position of the inner rotor 11. Qu1 to Qu4 are turned ON / OFF periodically. The same applies to the v-phase switching elements Qv1 to Qv4 and the w-phase switching elements Qw1 to Qw4. Thereby, since regenerative electric power can be used for charge of the battery 102, the battery 102 using regenerative electric power can be charged efficiently.

  (11) 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 primary side bidirectional switch circuit is not essential. For example, as shown in FIG. 8, the u-phase stator conversion unit 43u includes a single primary-side u-phase switching having a primary-side u-phase body diode Dbu1 instead of the primary-side u-phase bidirectional switch circuit 97u. The structure provided with element Qu1 may be sufficient.

  Further, as shown in FIG. 9, the u-phase stator converter 43u includes a primary-side u-phase switching element Qu1 and the primary-side u-phase switching element Qu1 instead of the primary-side u-phase bidirectional switch circuit 97u. And a first u-phase diode Du1 connected in series with each other and a second u-phase diode Du2 connected in parallel with the series connection body. The forward direction of the first u-phase diode Du1 and the forward direction of the primary u-phase body diode Dbu1 are opposite to each other. The second u-phase diode Du2 is provided so that the forward direction is opposite to that of the first u-phase diode Du1. In this case, the number of primary side switching elements can be reduced. That is, the number of primary side switching elements per phase may be one, or three or more.

  ○ The specific circuit configuration of the bidirectional switch circuit on the secondary side is arbitrary. For example, as shown in FIG. 8, the secondary-side u-phase bidirectional switch circuit 111u is arranged on the u-phase wiring 111bu connecting the midpoints of the u-phase bridge circuit 111au composed of four diodes and the u-phase bridge circuit 111au. The secondary side u-phase switching element Qu3 provided in the configuration may be used.

  Also, for example, as shown in FIG. 9, the secondary-side u-phase bidirectional switch circuit 121u includes a first serial-side u-phase switching element Qu3 and a third u-phase diode Du3 connected in series, and a second 2 A configuration including a series connection body of the secondary u-phase switching element Qu4 and the fourth u-phase diode Du4 may be employed. Both series-connected bodies may be connected in parallel so that the power transmission directions are opposite to each other.

As long as the phase stator converters 43u to 43w can perform the DC / AC conversion operation, the specific circuit configuration is arbitrary, and for example, the phase stator converters 43u to 43w may not satisfy the E class operation condition.
As long as the phase rotor converters 45u to 45w can perform an AC / AC conversion operation, the specific circuit configuration thereof is arbitrary, and for example, the phase rotor converters 45u to 45w may not satisfy the E class operation condition.

  The phase rotor conversion unit may perform an AC / DC conversion operation that converts transmission power into DC power. Even in this case, by changing the input timing of DC power to each phase rotor coil 22u-22w for each phase rotor converter, the energization mode of each phase rotor coil 22u-22w is made close to three-phase AC. Through which the first electric motor 31 can be driven. However, if attention is paid to the fact that the torque generated by the first electric motor 31 can be increased, the configuration in which the AC / AC conversion operation is performed is preferable.

  The circuit configuration of the phase rotor converter that performs the AC / DC conversion operation is arbitrary. For example, instead of the bidirectional switch circuit on the secondary side, a single secondary switching element having a body diode is employed. It is conceivable. In this case, the number of switching elements provided in the inner rotor 11 can be reduced.

  Moreover, the specific structure which changes the input timing of the direct-current power to each phase rotor coil 22u-22w for every phase rotor conversion part is arbitrary. For example, the execution timing may be different for each phase, and the switching control of the secondary side switching element of each phase may be intermittently configured, or a dedicated switch for controlling the input timing separately from the secondary side switching element The switch may be provided to control the switch.

The stator conversion unit and the rotor conversion unit are not limited to the same circuit configuration, and may be different circuit configurations.
○ Of the ratio of the first power running delay time Tdp1, the second power running delay time Tdp2, the ratio of both power running delay times Tdp1, Tdp2, the first regeneration delay time Tdr1, the second regeneration delay time Tdr2, and the ratio of both regeneration delay times Tdr1, Tdr2. The at least one parameter may be different for each phase.

  ○ Focusing on the fact that the power value of the output power of the phase rotor converters 45u to 45w fluctuates according to the delay time Td, both controllers 94 and 95 change the delay time Td to change the power of the output power. You may perform variable control of a value. That is, the delay time Td is not limited to both regeneration delay times Tdr1, Tdr2 or both power running delay times Tdp1, Tdp2.

  The stator controller 95 may control each secondary side switching element Qu3-Qw4. In this case, the stator controller 95 determines the delay time Td, and the control signal delayed by the delay time Td with respect to the clock signal CK is provided in the inner rotor 11 via the signal coupling capacitors Cz1 and Cz2. To the waveform shaping unit. The waveform shaping unit may generate (restore) a control signal from the differential waveform of the control signal and output the generated control signal to each of the secondary side switching elements Qu3 to Qw4. Thereby, simplification of the rotor controller 94 can be achieved. In this case, the rotor controller 94 may transmit the detection result of the rotation angle sensor 96 to the stator controller 95 as necessary.

  The phase rotor converters 45u, 45v, 45w may include phase resonance coils Lu3, Lv3, Lw3. Specifically, the u-phase resonance coil Lu3 may be on a wiring connecting the first u-phase coupling capacitor Cu1 and the secondary u-phase coil Lu2.

  ○ 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.

Each phase E class inverter Eiu to Eiw may perform step-up or step-down voltage value conversion, and each phase E class converter Ecu to Ecw may perform step-up or step-down voltage value conversion.
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.

O The switching element is not limited to an n-type MOSFET, but is arbitrary such as an IGBT.
The direct current power source is the battery 102, but is not limited to this, and any power storage device that can be charged and 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 u-phase second conversion unit is configured using at least the secondary-side switching element, and includes a secondary-side u-phase bidirectional switch circuit capable of flowing a current bidirectionally. The secondary-side u-phase bidirectional switch circuit is connected in parallel to the u-phase rotor coil, and the v-phase second converter is configured using at least the secondary-side switching element, A secondary-side v-phase bidirectional switch circuit capable of passing a current in the direction, the secondary-side v-phase bidirectional switch circuit is connected in parallel to the v-phase rotor coil, and the w-phase second conversion unit includes: The secondary side w-phase bidirectional switch circuit is configured using at least the secondary side switching element and includes a secondary side w-phase bidirectional switch circuit capable of flowing a current bidirectionally. W-phase rotorcoy The rotating electrical machine according to claim 3 which is connected in parallel.

  DESCRIPTION OF SYMBOLS 10 ... Rotary electric machine, 11 ... Inner rotor, 12 ... Outer rotor, 13 ... Stator, 22 ... Rotor coil, 22u ... u-phase rotor coil, 22v ... v-phase rotor coil, 22w ... w-phase rotor coil, 31 ... First electric motor Motor (three-phase motor), 40 ... electric field coupling type non-contact power feeding system, 41u ... u-phase feeding unit, 41v ... v-phase feeding unit, 41w ... w-phase feeding unit, 42 ... electronic unit, 43 ... stator conversion unit, 43u ... u-phase stator conversion unit, 43v ... v-phase stator conversion unit, 43w ... w-phase stator conversion unit, 44 ... non-contact power transmission unit, 44u ... u-phase transmission unit, 44v ... v-phase transmission unit, 44w ... w-phase transmission 45, rotor conversion section, 45u, u phase rotor conversion section, 45v, v phase rotor conversion section, 45w, w phase rotor conversion section, 61u, 62u, u phase rotating electrode, 71u, 72u, u phase protection. Electrode, 94 ... Rotor controller, 95 ... Stator controller, 96 ... Rotation angle sensor, 97u to 97w ... Primary side bidirectional switch circuit, 98u to 98w ... Secondary phase bidirectional switch circuit, 99u to 99w ... Phase series resonant circuit, 100 ... vehicle, 102 ... battery (DC power supply), Cu1, Cu2 ... u phase coupling capacitor, Cv1, Cv2 ... v phase coupling capacitor, Cw1, Cw2 ... w phase coupling capacitor, Ecu to Ecw ... phase E Class converter, Eiu to Eiw ... Phase E class inverter, Lu3 to Lw3 ... Phase resonance coil, Qu1 to Qw2 ... Primary side switching element, Qu3 to Qw4 ... Secondary side switching element, Td ... Delay time, Tdp1 ... First power running Delay time, Tdp2 ... second power running delay time.

Claims (8)

A rotor,
A three-phase motor having a u-phase rotor coil, a v-phase rotor coil and a w-phase rotor coil provided in the rotor;
a u-phase power feeding unit that feeds power to the u-phase rotor coil using electric field coupling type non-contact power transmission via a u-phase coupling capacitor;
a v-phase power feeding unit that feeds power to the v-phase rotor coil by using electric field coupling type non-contact power transmission via a v-phase coupling capacitor;
a w-phase power feeding unit that feeds power to the w-phase rotor coil using electric field coupling type non-contact power transmission through a w-phase coupling capacitor;
A rotating electric machine comprising: Each of the phase coupling capacitors is composed of a holding electrode that is held so as not to rotate with the rotation of the rotor, and a rotating electrode that is provided on the rotor and disposed opposite to the holding electrode,
The u-phase power feeding unit is
A u-phase 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, and outputs the AC power to the holding electrode of the u-phase coupling capacitor. A first conversion unit;
AC power supplied to the rotor and received by the rotating electrode of the u-phase coupling capacitor is passed through DC power to drive power corresponding to the u-phase among the three-phase AC that can be driven by the three-phase motor. A u-phase second converter that performs an AC / AC conversion operation to convert the u-phase, and outputs drive power corresponding to the u-phase to the u-phase rotor coil;
With
The v-phase power feeding unit is
A v-phase first converter that performs a DC / AC conversion operation for converting the power source power to the AC power, and outputs the AC power to the holding electrode of the v-phase coupling capacitor;
AC / AC conversion provided in the rotor for converting AC power received by the rotating electrode of the v-phase coupling capacitor into driving power corresponding to the v phase of the three-phase AC without passing through DC power A v-phase second converter that performs an operation and outputs drive power corresponding to the v-phase to the v-phase rotor coil;
With
The w-phase power feeding unit is
A w-phase first converter that performs a DC / AC conversion operation for converting the power supply power to the AC power, and outputs the AC power to the holding electrode of the w-phase coupling capacitor;
AC / AC conversion provided in the rotor for converting AC power received by the rotating electrode of the w-phase coupling capacitor into driving power corresponding to the w-phase of the three-phase AC without passing through DC power A w-phase second converter that performs an operation and outputs drive power corresponding to the w-phase to the w-phase rotor coil;
The rotating electrical machine according to claim 1, comprising: Each of the phase first conversion units has a primary side switching element, and performs the DC / AC conversion operation when the primary side switching element is periodically turned ON / OFF.
Each of the phase second conversion units has a secondary side switching element, and the secondary side switching element is periodically turned on / off in a state delayed by a delay time with respect to the primary side switching element of the same phase. By turning OFF, power is output to the corresponding phase rotor coil, and the direction of the current flowing through the corresponding phase rotor coil is switched according to the delay time,
The rotating electrical machine includes a control unit that controls the primary side switching element of each phase first conversion unit and the secondary side switching element of each phase second conversion unit,
The controller is
Both are periodically turned on while the rising timing of the secondary-side switching element of the u-phase second conversion unit is delayed by a delay time from the rising timing of the primary-side switching element of the u-phase first conversion unit. / OFF and periodically changing the delay time to execute the DC / AC conversion operation of the u-phase first conversion unit and the AC / AC conversion operation of the u-phase second conversion unit. ,
Both are periodically turned on while the rising timing of the secondary-side switching element of the v-phase second conversion unit is delayed by a delay time from the rising timing of the primary-side switching element of the v-phase first conversion unit. / OFF and periodically changing the delay time to execute the DC / AC conversion operation of the v-phase first conversion unit and the AC / AC conversion operation of the v-phase second conversion unit. ,
Both are periodically turned on while the rising timing of the secondary-side switching element of the w-phase second conversion unit is delayed by a delay time from the rising timing of the primary-side switching element of the w-phase first conversion unit. / OFF and periodically changing the delay time to execute the DC / AC conversion operation of the w-phase first conversion unit and the AC / AC conversion operation of the w-phase second conversion unit. The rotating electrical machine according to claim 2, wherein the rotating electrical machine is one. The delay time is
A first power running delay time in which a power transmission direction is a first direction from the DC power source toward the three-phase motor, and a forward current flows through the corresponding phase rotor coil;
A second power running delay time in which a power transmission direction is the first direction and a current in a direction opposite to the forward direction flows through the corresponding phase rotor coil;
Including
The controller is
u-phase first powering operation in which the primary side switching element and the secondary side switching element corresponding to the u phase are periodically turned on and off with a shift by the first powering delay time, and the second powering delay time The u-phase second powering operation that is periodically turned ON / OFF with a deviation is alternately executed,
v-phase first powering operation in which the primary-side switching element and the secondary-side switching element corresponding to the v-phase are periodically turned on / off with a shift by the first power-running delay time, and the second power-running delay time And v-phase second powering operation that is periodically turned on and off, and repeatedly executed,
w-phase first powering operation in which the primary-side switching element and the secondary-side switching element corresponding to the w-phase are periodically turned on and off with a shift by the first powering delay time, and the second powering delay time The first-side switching element of each phase first conversion unit and the phase second conversion unit so as to alternately and repeatedly execute a w-phase second powering operation that is periodically turned on and off with a shift. The rotating electrical machine according to claim 3, wherein the rotating side switching element is controlled.   The control unit shifts the execution timing of the u-phase first power running motion, the execution timing of the v-phase first power running motion, and the execution timing of the w-phase first power running motion by a predetermined period. The rotating electrical machine described.   The control unit includes an execution cycle of a u-phase unit powering operation in which the u-phase first powering operation and the u-phase second powering operation are combined in accordance with the rotational speed of the rotor, and the v-phase first powering operation. And the execution cycle of the v-phase unit powering operation that combines the v-phase second powering operation and the execution cycle of the w-phase unit powering operation that combines the w-phase first powering operation and the w-phase second powering operation. The rotating electrical machine according to claim 5. The u-phase power supply section includes a u-phase resonance coil that is connected in series with the u-phase coupling capacitor and forms a u-phase series resonance circuit in cooperation with the u-phase coupling capacitor.
The u-phase first conversion unit and the u-phase series resonance circuit constitute a u-phase E-class inverter that performs class E operation. The u-phase second conversion unit and the u-phase series resonance circuit constitute a class E. A u-phase E class converter is configured to operate,
The v-phase power supply unit includes a v-phase resonance coil that is connected in series with the v-phase coupling capacitor and forms a v-phase series resonance circuit in cooperation with the v-phase coupling capacitor.
The v-phase first conversion unit and the v-phase series resonance circuit constitute a v-phase E class inverter that performs class E operation. The v-phase second conversion unit and the v-phase series resonance circuit constitute a class E. A v-phase E class converter is configured to operate,
The w-phase power feeding unit includes a w-phase resonance coil that is connected in series with the w-phase coupling capacitor and forms a w-phase series resonance circuit in cooperation with the w-phase coupling capacitor.
The w-phase first converter and the w-phase series resonant circuit constitute a w-phase E class inverter that performs class E operation, and the w-phase second converter and the w-phase series resonant circuit constitute a class E. The rotating electrical machine according to any one of claims 2 to 6, wherein a w-phase E-class converter that operates is configured. The DC power supply is a power storage device capable of charging and discharging,
Each said phase electric power feeding part is comprised so that the regenerative electric power which generate | occur | produced in the said three-phase motor can be electrically fed to the said electrical storage apparatus via each said phase coupling capacitor. The rotating electrical machine described in 1.

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