JP4291731B2 - Rotating electric machine drive device and vehicle equipped with the same - Google Patents

Description

  The present invention relates to a rotating electrical machine drive device and a vehicle including the same, and in particular, includes two multi-phase AC rotating electrical machines, and can exchange single-phase AC power with the outside using a plurality of coils included in these rotating electrical machines. The present invention relates to a rotary electric machine drive device and a vehicle including the same.

  2. Description of the Related Art Conventionally, proposals have been made to use a hybrid vehicle using a motor generator as a power source or an electric vehicle as a commercial power source (AC 100V power source). In other words, a hybrid vehicle or the like is to be used as an emergency power source in the event of an emergency or disaster, or as a commercial power source when there is no commercial power source facility around the camp site. And such a utilization method raises the commercial value of a hybrid vehicle etc.

  As an automobile that can be used as such a commercial power source, an automobile including a secondary battery and an AC100V inverter for converting DC power from the secondary battery into AC100V power and outputting it to an outlet is known. (For example, refer to Patent Document 1).

According to the automobile disclosed in Patent Document 1, whether or not AC100V output can be output is determined based on the state of an AC100V inverter, a vehicle control system, a secondary battery, and the like, so that good drive control of the vehicle is ensured. AC100V output can be performed using the power from the secondary battery.
JP 2002-374604 A (FIG. 1) JP-A-4-295202 Japanese Patent No. 3219039 JP 2002-218793 A

  However, the automobile disclosed in Patent Document 1 needs to be provided with a dedicated inverter for AC100V output.

  In addition to outputting the commercial power from the automobile to the outside, if the secondary battery mounted on the automobile can be charged from the external commercial power source, the commercial value of the automobile can be further increased.

  Therefore, the present invention has been made to solve such a problem, and an object of the present invention is to provide a rotating electrical machine drive device capable of outputting a single-phase AC voltage without providing a dedicated inverter.

  Another object of the present invention is to provide a rotating electrical machine drive device that can output a single-phase AC voltage without providing a dedicated inverter and that can charge a secondary battery with an external single-phase AC power source. Is to provide.

  Another object of the present invention is to provide a vehicle including a rotating electrical machine drive device that can output a single-phase AC voltage without providing a dedicated inverter.

  Another object of the present invention is to provide a rotating electrical machine drive device that can output a single-phase AC voltage without providing a dedicated inverter and that can charge a secondary battery with an external single-phase AC power source. It is to provide a vehicle equipped with.

  According to this invention, the rotating electrical machine drive device includes the first and second multi-phase alternating current rotating electrical machines, the first and second inverters that control energization of the first and second multi-phase alternating current rotating electrical machines, and A DC power source that supplies DC power to the first and second inverters, a neutral point of each phase coil in the first multi-phase AC rotating electrical machine, and an anti-middle of any coil in the second multi-phase AC rotating electrical machine The first and second power lines that are respectively connected to the sex point side and exchange electric power with the outside, and the first inverter so that the neutral point in the first multiphase AC rotating electric machine becomes the first voltage. And a control device that controls and controls the second inverter so that the anti-neutral point side of any of the coils in the second multiphase AC rotating electric machine becomes the second voltage.

  Preferably, the control device controls the first and second inverters so that a voltage difference between the first and second voltages becomes a commercial AC voltage.

  Preferably, the control device further boosts the input voltage using each coil and the second inverter in the second multiphase AC rotating electric machine when the first and second power lines receive an input voltage from the outside. Thus, the second inverter is controlled, and the DC power supply is charged by the boosted voltage boosted by using the coils and the second inverter in the second multiphase AC rotating electric machine.

  Preferably, the input voltage is a commercial AC voltage.

  Preferably, the control device turns off each switching element of the first arm of the second inverter corresponding to the coil of the second multiphase AC rotating electric machine to which the second power line is connected, and other than the first arm. Switching control of each switching element of the second arm group of the second inverter.

  Preferably, the control device sets the second inverter so that no driving force is generated in the second multiphase AC rotating electric machine when power is exchanged with the outside through the first and second power lines. Control.

  Preferably, the rotating electrical machine drive device further includes a converter connected between the DC power source and the DC line to which the first and second inverters are connected, and controlling the DC line to a predetermined voltage level.

  According to the invention, the vehicle includes any one of the above-described rotating electrical machine driving devices.

  Preferably, the vehicle further includes an internal combustion engine connected to the first multi-phase AC rotating electric machine, wherein the first multi-phase AC rotating electric machine converts the power generated by the internal combustion engine into AC power to convert the first power. The first inverter rectifies AC power received from the first multi-phase AC rotating electric machine and supplies the DC power to the DC power source. The control device is an external load connected to the first and second power lines. The number of revolutions of the internal combustion engine is controlled according to the above.

  In the rotating electrical machine drive device according to the present invention, power is exchanged with the outside on the neutral point of the first multiphase AC rotating electrical machine and on the anti-neutral point side of one of the coils in the second multiphase AC rotating electrical machine. The first and second power lines to be performed are connected, and the control device controls the first inverter so that the neutral point of the first multiphase AC rotating electric machine becomes the first voltage, and the second multiphase Since the second inverter is controlled such that the anti-neutral point side of the coil of the AC rotating electric machine becomes the second voltage, a desired single-phase voltage is output from the first and second power lines. At that time, the coil in the second multiphase AC rotating electric machine functions as an output filter for removing high frequency (carrier frequency component) noise.

  Therefore, according to the present invention, without providing a dedicated inverter for outputting a single-phase AC voltage, the first and second multi-phase AC rotating machines and the first and second inverters that drive and control them are provided. It can be used to output a single-phase AC voltage to the outside. Then, an ideal single-phase AC voltage with little voltage ripple is output by the output filter constituted by the coil of the second multiphase AC rotating electric machine.

  In the rotating electrical machine drive device according to the present invention, when an input voltage is received from the outside, the coil of the second multiphase AC rotating electrical machine and the second inverter function as a boost chopper circuit.

  Therefore, according to the present invention, the DC power supply can be charged by boosting the single-phase AC voltage input from the outside without providing a dedicated inverter for inputting and outputting the single-phase AC voltage.

  In the rotating electrical machine drive device according to the present invention, the control device turns off each switching element of the arm of the second inverter corresponding to the coil connected to the second power line, and performs switching control on the other switching elements. Therefore, a series coil is constituted by the second multiphase AC rotating electric machine between the second power line and the second inverter.

  Therefore, according to the present invention, when power is exchanged with the outside via the first and second power lines, the inductance of the second multi-phase AC rotating electrical machine can be used sufficiently effectively.

  A vehicle according to the present invention includes the above-described rotating electrical machine drive device.

  Therefore, according to the present invention, a single-phase AC voltage can be exchanged with the outside without providing a dedicated inverter. Further, since the dedicated inverter is not provided, there is no increase in vehicle cost, weight, and size.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
FIG. 1 is a schematic diagram showing the configuration of a hybrid vehicle shown as an example of a vehicle equipped with a rotating electrical machine drive device according to the present invention.

  Referring to FIG. 1, a hybrid vehicle 10 includes a battery 12, a power control unit (hereinafter referred to as “PCU”) 14, a power output device 16, a differential gear (hereinafter referred to as “DG”). 18), front wheels 20R and 20L, rear wheels 22R and 22L, front seats 24R and 24L, and a rear seat 26.

  The battery 12 is disposed, for example, behind the rear seat 26. The PCU 14 is disposed, for example, in an area below the floor located below the front seats 24R and 24L. The power output device 16 is disposed, for example, in an engine room in front of the dashboard 28. PCU 14 is electrically connected to battery 12 and power output device 16. The power output device 16 is connected to the DG 18.

  The battery 12 that is a DC power source is formed of, for example, a secondary battery such as nickel metal hydride or lithium ion, and supplies a DC voltage to the PCU 14 and is charged by the DC voltage from the PCU 14.

  PCU 14 boosts the DC voltage received from battery 12, converts the boosted voltage to an AC voltage, and drives and controls a motor generator (not shown) included in power output device 16. The PCU 14 charges the battery 12 by converting the AC voltage generated by the motor generator included in the power output device 16 into a DC voltage.

  Further, the PCU 14 can convert the DC voltage from the battery 12 into a commercial AC voltage and output it to the outside. Further, the PCU 14 can receive a commercial AC voltage from the outside and boost the received commercial AC voltage to charge the battery 12. The configuration of the PCU 14 will be described in detail later.

  The power output device 16 outputs power from an engine (not shown) and / or a motor generator to the DG 18. Further, the power output device 16 generates power by the rotational force of the front wheels 20R and 20L, and supplies the generated power to the PCU 14. Furthermore, the power output device 16 can generate electric power by a motor generator using the power of the engine, and can supply the generated electric power to the PCU 14.

  The DG 18 transmits the power received from the power output device 16 to the front wheels 20R and 20L, and transmits the rotational force of the front wheels 20R and 20L to the power output device 16.

  FIG. 2 is a circuit diagram showing a configuration of a main part of PCU 14 shown in FIG.

  Referring to FIG. 2, PCU 14 includes a DC / DC converter 30, inverters 32 and 34, an AC outlet 36, a control device 38, a capacitor C, power supply lines L1 and L2, and a ground line L3. . DC / DC converter 30 is connected to battery 12 via power supply line L1 and ground line L3. Inverters 32 and 34 are connected to DC / DC converter 30 via power supply line L2 and ground line L3. Motor generators MG1 and MG2 are connected to inverters 32 and 34, respectively. AC outlet 36 is connected to power lines ACL1 and ACL2. Power line ACL1 is connected to a neutral point of motor generator MG1, and power line ACL2 is connected to U-phase line UL2 of motor generator MG2. Further, the engine ENG is connected to the motor generator MG1.

  Motor generators MG1 and MG2 connected to inverters 32 and 34, respectively, are included in power output device 16 shown in FIG. Motor generator MG1 is a three-phase AC synchronous motor generator, and is connected to inverter 32 via U, V, W phase lines UL1, VL1, WL1, and generates driving force by AC power received from inverter 32. . Motor generator MG1 converts the power generated by engine ENG included in power output device 16 into alternating current power, and the alternating current power is supplied to inverter 32 via U, V, W phase lines UL1, VL1, WL1. Supply.

  Motor generator MG2 is a three-phase AC synchronous motor, and is connected to inverter 34 via U, V, W phase lines UL2, VL2, WL2, and generates driving force by AC power received from inverter 34. When the PCU 14 outputs a commercial AC voltage from the AC outlet 36 to the outside, the motor generator MG2 functions as a high frequency elimination filter, and charges the battery 12 with the commercial AC power input to the AC outlet 36 from the outside of the PCU 14. When doing so, motor generator MG2 together with inverter 34 constitutes a boost chopper circuit that boosts the input commercial AC voltage. These will be described in detail later.

  The DC / DC converter 30 includes power transistors Q1 and Q2, diodes D1 and D2, and a reactor L. Power transistors Q1 and Q2 are connected in series between power supply line L2 and ground line L3, and receive a control signal from control device 38 as a base. Diodes D1 and D2 are connected between the collector and emitter of each of the power transistors Q1 and Q2 so that current flows from the emitter side to the collector side.

  Reactor L has one end connected to power supply line L1 connected to the positive electrode of battery 12, and the other end connected to a connection point between the emitter of power transistor Q1 and the collector of power transistor Q2. Reactor L boosts the DC voltage from battery 12 by accumulating the current flowing through the coil as magnetic field energy according to the switching operation of power transistor Q2, and power transistor Q2 turns off the boosted DC voltage. The power is supplied to the power supply line L2 via the diode D1 in synchronization with the timing.

  The DC / DC converter 30 boosts the DC voltage received from the battery 12 based on a control signal from the control device 38 and controls the power supply line L2 to the voltage VC. DC / DC converter 30 charges battery 12 by reducing the DC voltage received from power supply line L2 to the battery voltage.

  Inverter 32 includes a U-phase arm 322, a V-phase arm 324, and a W-phase arm 326. Each phase arm is connected in parallel between the power supply line L2 and the ground line L3. The U-phase arm 322 includes power transistors Q11 and Q12 connected in series, the V-phase arm 324 includes power transistors Q13 and Q14 connected in series, and the W-phase arm 326 includes power connected in series. It consists of transistors Q15 and Q16. Further, diodes D11 to D16 for flowing current from the emitter side to the collector side are connected between the collector and emitter of each of the power transistors Q11 to Q16.

  And the connection point of each power transistor in each phase arm is on the anti-neutral point side of each U, V, W phase coil in motor generator MG1 via U, V, W phase lines UL1, VL1, WV1, respectively. It is connected.

  The inverter 32 converts the DC voltage received from the power supply line L2 into an AC voltage based on a control signal from the control device 38, and converts the converted AC voltage into the U, V, W phase lines UL1, VL1, WV1. To the motor generator MG1 to drive and control the motor generator MG1. Inverter 32 receives AC voltage generated by motor generator MG1 from U, V, and W phase lines LU1, LV1, and LW1, rectifies the received AC voltage into DC voltage, and supplies it to power supply line L2. .

  Here, inverter 32 is based on a control signal from control device 38 such that the voltage level at the neutral point of motor generator MG1 to which power line ACL1 connected to AC outlet 36 is connected becomes VC / 2. Switching operation of each power transistor Q11-Q16 is performed. In other words, inverter 32 controls the motor generator MG1 and adjusts the duty ratios of the upper and lower arms of U, V, and W phase arms 322, 324, and 326 by controller 38, so that zero of motor generator MG1 is controlled. The phase voltage is controlled to VC / 2.

  Inverter 34 includes a U-phase arm 342, a V-phase arm 344, and a W-phase arm 346. Each phase arm is connected in parallel between the power supply line L2 and the ground line L3. The U-phase arm 342 includes power transistors Q21 and Q22 connected in series, the V-phase arm 344 includes power transistors Q23 and Q24 connected in series, and the W-phase arm 346 includes power connected in series. It consists of transistors Q25 and Q26. In addition, diodes D21 to D26 that allow current to flow from the emitter side to the collector side are connected between the collectors and emitters of the power transistors Q21 to Q26, respectively.

  And the connection point of each power transistor in each phase arm is on the anti-neutral point side of each U, V, W phase coil in motor generator MG2 via U, V, W phase lines UL2, VL2, WV2, respectively. It is connected.

  The inverter 34 converts the DC voltage received from the power supply line L2 into an AC voltage based on a control signal from the control device 38, and converts the converted AC voltage into the U, V, W phase lines UL2, VL2, WV2. To the motor generator MG2 to drive and control the motor generator MG2.

  When the PCU 14 outputs a commercial AC voltage from the AC outlet 36 to the outside, the inverter 34 is connected to the motor generator MG2 to which the power line ACL2 connected to the AC outlet 36 is connected based on a control signal from the control device 38. The voltage level of the U-phase line UL2 is (VC / 2 + 100√2sin (2πft)) (“f” represents the frequency of the commercial AC voltage, f = 50 Hz or 60 Hz, and so on). Switching operation of power transistors Q21 to Q26 is performed. That is, inverter 34 turns off power transistors Q21 and Q22 in U-phase arm 342 based on a control signal from control device 38 in order to control U-phase line UL2 to the voltage level, and V, W The power transistors Q23 to Q26 of the phase arms 344 and 346 are controlled by PWM (Pulse Width Modulation) to convert the DC voltage VC received from the power supply line L2 into the above voltage (VC / 2 + 100√2 sin (2πft)).

  Here, a high frequency carrier frequency component by PWM control is superimposed on the output voltage from inverter 34, and each phase coil in motor generator MG2 functions as an output filter for removing this high frequency noise. When each phase coil in motor generator MG2 is viewed as an output filter, an output filter is constituted by two V and U phase coils connected in series between V phase line VL2 and power line ACL2, and W phase line WL2 And the power line ACL2, an output filter is constituted by two W and U phase coils connected in series. Therefore, in this PCU 14, each coil in motor generator MG2 is sufficiently effectively used, and an ideal commercial AC voltage with little voltage ripple can be output from AC outlet 36.

  Furthermore, when charging battery 12 with commercial AC power input from outside PCU 14 to AC outlet 36, inverter 34 functions as a boost chopper circuit together with each phase coil of motor generator MG2, and supplies the boosted boosted voltage to the power line. A DC line consisting of L2 and ground line L3 is supplied. In other words, inverter 34 is based on a control signal from control device 38 to boost the commercial AC voltage input to power line ACL2 connected to U-phase line UL2 of motor generator MG2 via AC outlet 36 from the outside. The power transistors Q21 and Q22 in the U-phase arm 342 are both turned off, and the power transistors Q23 to Q26 in the V and W phase arms 344 and 346 are switched. As a result, the current supplied from AC outlet 36 is accumulated as magnetic field energy in each phase coil of motor generator MG2, and the accumulated energy is released via V and W phase arms 344 and 346, and the boosted voltage is increased. It is supplied to a DC line composed of a power supply line L2 and a ground line L3.

  Here, each phase coil in motor generator MG2 functions as an inductance for accumulating magnetic field energy in the step-up chopper circuit as described above. When each phase coil in motor generator MG2 is viewed as an inductance for accumulating magnetic field energy in the boost chopper circuit, the inductance due to the two U and V phase coils connected in series is between power line ACL2 and V phase line VL2. Thus, between the power line ACL2 and the W-phase line WL2, an inductance is formed by two U and W-phase coils connected in series. Therefore, in this PCU 14, the boosting operation can be performed by making effective use of each coil in motor generator MG2.

  The AC outlet 36 is an input / output socket for outputting commercial AC power from the PCU 14 to the outside or supplying commercial AC power to the PCU 14 from the outside. AC outlet 36 is connected to power line ACL1 connected to the neutral point of motor generator MG1 and ACL2 connected to U-phase line UL2 of motor generator MG2. Capacitor C is provided between power supply line L2 and ground line L3, and smoothes the voltage level of power supply line L2.

  The control device 38 includes a DC / DC controller 40, an MG1 controller 42, an MG2 controller 44, an engine controller 46, and an AC power supply controller 48.

  The DC / DC controller 40 controls the DC / DC converter 30 so that the voltage level of the power supply line L2 becomes VC. DC / DC controller 40 receives voltage command VCref from AC power supply controller 48 and controls the switching operation of power transistors Q1 and Q2 included in DC / DC converter 30 based on received voltage command VCref.

  The MG1 controller 42 controls the inverter 32 so that the motor generator MG1 rotates so that the efficiency of the engine ENG becomes maximum, and the voltage level at the neutral point of the motor generator MG1 becomes VC / 2. MG1 controller 42 receives rotation speed command Nref and neutral point voltage command VNref (= VCref / 2) of motor generator MG1 from AC power supply controller 48, and based on the received rotation speed command Nref and neutral point voltage command VNref. The PWM signal is generated, and the generated PWM signal is output to the power transistors Q11 to Q16 included in the inverter 32.

  MG2 controller 44 controls inverter 34 such that motor generator MG1 rotates at a desired torque and rotation speed. When PCU 14 outputs a commercial AC voltage to the outside, MG2 controller 44 receives voltage command VUref from AC power supply controller 48 and, based on received voltage command VUref, voltage on U-phase line UL2 of motor generator MG2 Is controlled to be (VC / 2 + 100√2sin (2πft)). Furthermore, when charging battery 12 with commercial AC power from the outside, MG2 controller 44 controls inverter 34 such that motor generator MG2 and inverter 34 operate as a boost chopper circuit.

  Here, when commercial AC voltage is input / output from AC outlet 36, MG2 controller 44 turns off power transistors Q21 and Q22 in U-phase arm 342, and power in V and W phase arms 344 and 346, respectively. The transistors Q23 to Q26 are subjected to switching control. Then, MG2 controller 44 controls the switching operation of inverter 34 such that only d-axis current is generated, for example, for motor generator MG2 in order to prevent driving force from being generated in motor generator MG2.

  The engine controller 46 receives an output command Pref from the engine ENG from the AC power supply controller 48 and controls the engine ENG based on the received output command Pref.

  The AC power controller 48 receives the output voltage V * from the AC outlet 36, and the DC / DC controller 40, the MG1 controller 42, the MG2 controller 44, and the engine controller 46 so that the output voltage from the AC outlet 36 becomes a commercial AC voltage. Each control command is output. That is, the AC power controller 48 generates an optimum voltage command VCref for outputting a commercial AC voltage, and outputs it to the DC / DC controller 40. Further, AC power supply controller 48 generates a neutral point voltage command VNref = VCref / 2 of motor generator MG1 and a rotational speed command Nref of motor generator MG1 that maximizes the engine efficiency, and outputs it to MG1 controller 42.

  Further, AC power supply controller 48 generates voltage command VUref = VNref + 100√2 sin (2πft) of U-phase line UL2 in motor generator MG2 and outputs the voltage command to MG2 controller 44. Further, the AC power supply controller 48 generates an output command Pref of the engine ENG according to an external load connected to the AC outlet 36 or the SOC (State of Charge) of the battery 12, and the generated output command Pref is used as the engine. Output to the controller 46.

  In the above description, inverters 32 and 34 constitute “first and second inverters”, respectively. Motor generators MG1 and MG2 constitute “first and second multiphase AC rotating electric machines”, respectively.

  FIG. 3 is a circuit diagram showing an equivalent circuit of motor generator MG2 and inverter 34 connected thereto when commercial AC voltage is input / output in AC outlet 36 shown in FIG.

  Referring to FIG. 3, when a commercial AC voltage is input / output in AC outlet 36 (not shown), power transistors Q21 and Q22 in U-phase arm 342 of inverter 34 are always turned off. Therefore, in FIG. 3, the U-phase arm 342 is not shown.

  When each phase coil in motor generator MG2 functions as an output filter that removes high-frequency noise, a filter in which V and U phase coils are connected in series is configured between V-phase line VL2 and power line ACL2. A filter in which W and U phase coils are connected in series is configured between the line VL2 and the power line ACL2.

  Further, even when each phase coil in motor generator MG2 functions as an inductance in the step-up chopper circuit, an inductance in which U and V phase coils are connected in series is configured between power line ACL2 and V phase line VL2. Between power line ACL2 and W-phase line WL2, an inductance in which U and W phase coils are connected in series is formed.

  That is, in this circuit, since the inductance generated by two coils connected in series is used instead of using the leakage inductance of the coil in motor generator MG2, the inductance of motor generator MG2 should be used effectively. Can do.

  4 and 5 are diagrams showing the flow of current in the equivalent circuit shown in FIG. 3 when a commercial AC voltage is output from the AC outlet 36. FIG.

  Referring to FIG. 4, when a positive voltage is output from power line ACL 2 toward power line ACL 1 (not shown), MG 2 controller 44 controls the power of the upper arm in V and W phase arms 344 and 346 of inverter 34. The transistors Q23 and Q25 are PWM controlled. Then, current flows from power supply line L2 to power line ACL2 through power transistors Q23 and V, U phase coils and power transistors Q25, W, U phases coils.

  Referring to FIG. 5, when a negative voltage is output from power line ACL 2 toward power line ACL 1, MG2 controller 44 causes power transistors Q 24 and Q 26 of the lower arm in V and W phase arms 344 and 346 of inverter 34 to be output. PWM control is performed. Then, current flows from power line ACL2 to ground line L3 via U and V phase coils and power transistor Q24 and U and W phase coils and power transistor Q26.

  As a result, a commercial AC voltage can be generated on the power line ACL2.

  6 to 9 are diagrams showing a current flow in the equivalent circuit shown in FIG. 3 when a commercial AC voltage is inputted to the AC outlet 36 from the outside.

  Referring to FIG. 6, when the voltage of power line ACL 2 is lower than the voltage of power line ACL 1 (not shown), MG2 controller 44 first sets the power of the lower arm in V and W phase arms 344 and 346 of inverter 34. Transistors Q24 and Q26 are turned on. Then, current flows from power line ACL2 to ground line L3 via U and V phase coils and power transistor Q24 and U and W phase coils and power transistor Q26. At this time, magnetic field energy is accumulated in the U, V, W phase coils.

  Referring to FIG. 7, MG2 controller 44 subsequently turns off power transistors Q24 and Q26. Then, the magnetic field energy accumulated in the U, V, W phase coils is discharged to the power supply line L2 via the upper arm diodes D23, D25 in the V, W phase arms 344, 346 of the inverter 34, and the power supply line L2 To be supplied.

  That is, a step-up chopper circuit is configured using the U, V, W phase coils of motor generator MG2 and the V, W phase arms of inverter 34 to boost the commercial AC voltage on power line ACL2 and supply it to power supply line L2. Can do. The boosted voltage supplied to the power supply line L2 is stepped down to the battery voltage by the DC / DC converter 30, and the battery 12 is charged.

  Referring to FIG. 8, when the voltage of power line ACL 2 is higher than the voltage of power line ACL 1, MG2 controller 44 first sets power transistors Q 23 and Q 25 of the upper arm in V and W phase arms 344 and 346 of inverter 34. Turn on. Then, current flows from power supply line L2 to power line ACL2 through power transistors Q23 and V, U phase coils and power transistors Q25, W, U phases coils. At this time, magnetic field energy is accumulated in the U, V, W phase coils.

  Referring to FIG. 9, MG2 controller 44 subsequently turns off power transistors Q23 and Q25. Then, the magnetic field energy accumulated in the U, V, W phase coils causes U of motor generator MG2 from ground line L3 through lower arm diodes D24, D26 in V, W phase arms 344, 346 of inverter 34. , V, W current is passed through each phase coil.

  That is, sucking current from ground line L3 is a step-up operation in the same manner as supplying current to power supply line L2. In this case as well, the U, V, W phase coils and inverter 34 of motor generator MG2 are used. The step-up chopper circuit is configured using the V and W-phase arms, and the commercial AC voltage in the power line ACL2 can be boosted. The boosted voltage is stepped down to the battery voltage by the DC / DC converter 30 and the battery 12 is charged.

  As described above, according to this embodiment, without providing a dedicated inverter for outputting a commercial AC voltage, the commercial AC voltage is obtained using motor generators MG1 and MG2 and inverters 32 and 34 that drive and control them. Can be output from the AC outlet 36 to the outside. Then, an ideal commercial AC voltage with little voltage ripple is output by an output filter constituted by each phase coil of motor generator MG2.

  Further, according to this embodiment, when a commercial AC voltage is input from the outside to AC outlet 36, each phase coil of motor generator MG2 and inverter 34 constitute a boost chopper circuit. The battery 12 can be charged by boosting the commercial AC voltage input from the outside without providing a dedicated inverter for output.

  Further, according to this embodiment, when commercial AC power is exchanged with the outside via AC outlet 36, the motor generator MG2 constitutes a series coil between power line ACL2 and inverter 34. The inductance of the generator MG2 can be used sufficiently effectively.

  In addition, according to this embodiment, the hybrid vehicle 10 can exchange the commercial AC voltage with the outside without providing a dedicated inverter. Further, since the hybrid vehicle 10 does not include a dedicated inverter, the cost increases and the weight increases. There will be no increase in size.

  According to this embodiment, when commercial AC power is exchanged with the outside via AC outlet 36, control device 38 controls inverter 34 so that no driving force is generated in motor generator MG2. Thus, the hybrid vehicle 10 with sufficient consideration for safety is realized.

  In the above embodiment, the voltage level at the neutral point of motor generator MG1 is controlled to a constant zero-phase voltage VC / 2, and the voltage of U-phase line UL2 of motor generator MG2 is (VC / 2 + 100√). 2 sin (2πft)), but the neutral point of motor generator MG1 and each voltage of U-phase line UL2 of motor generator MG2 are not limited to the above. For example, the neutral point of motor generator MG1 may be controlled to an AC voltage, and the voltage level of U-phase line UL2 of motor generator MG2 may be controlled to a constant value.

  In the above-described embodiment, the case of a hybrid vehicle is representatively described as a vehicle on which the motor driving device according to the present invention is mounted. However, the scope of application of the present invention is not limited to a hybrid vehicle. For example, the present invention can be applied even to an automobile not equipped with an engine such as an electric vehicle or a fuel cell vehicle equipped with a secondary battery.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

1 is a schematic diagram showing a configuration of a hybrid vehicle shown as an example of a vehicle equipped with a motor drive device according to the present invention. It is a circuit diagram which shows the structure of the principal part of PCU shown in FIG. FIG. 3 is a circuit diagram showing an equivalent circuit of motor generator MG2 and an inverter connected thereto when commercial AC voltage is input / output in the AC outlet shown in FIG. FIG. 4 is a first diagram illustrating a current flow in the equivalent circuit illustrated in FIG. 3 when a commercial AC voltage is output from an AC outlet. FIG. 4 is a second diagram illustrating a current flow in the equivalent circuit illustrated in FIG. 3 when a commercial AC voltage is output from an AC outlet. FIG. 4 is a first diagram illustrating a current flow in the equivalent circuit illustrated in FIG. 3 when a commercial AC voltage is input to an AC outlet from the outside. FIG. 4 is a second diagram illustrating a current flow in the equivalent circuit illustrated in FIG. 3 when a commercial AC voltage is input to an AC outlet from the outside. FIG. 4 is a third diagram illustrating a current flow in the equivalent circuit illustrated in FIG. 3 when a commercial AC voltage is input to an AC outlet from the outside. FIG. 4 is a fourth diagram illustrating a current flow in the equivalent circuit illustrated in FIG. 3 when a commercial AC voltage is input to an AC outlet from the outside.

Explanation of symbols

  10 hybrid vehicle, 12 battery, 14 PCU, 16 power output device, 18 DG, 20R, 20L front wheel, 22R, 22L rear wheel, 24R, 224 front seat, 26 rear seat, 28 dashboard, 30 DC / DC converter, 32, 34 inverter, 36 AC outlet, 38 controller, 40 DC / DC controller, 42 MG1 controller, 44 MG2 controller, 46 engine controller, 48 AC power controller, 322, 342 U-phase arm, 324, 344 V-phase arm, 326 346 W-phase arm, MG1, MG2 motor generator, ENG engine, Q1, Q2, Q11-Q16, Q21-Q26 power transistor, D1, D2, D11-D16, D21-D26 Node, C capacitor, L reactor, L1, L2, ACL1, ACL2 power line, L3 ground line, UL1, UL2 U phase line, VL1, VL2 V phase line, WL1, WL2 W phase line.

Claims (9)

First and second multiphase AC rotating electrical machines;
First and second inverters for controlling energization of the first and second multiphase AC rotating electric machines, respectively;
A DC power supply for supplying DC power to the first and second inverters;
Connected to the neutral point of each phase coil in the first multi-phase AC rotating electrical machine and the anti-neutral point side of any coil in the second multi-phase AC rotating electrical machine, and exchanges power with the outside. First and second power lines;
The first inverter is controlled so that the neutral point in the first multiphase AC rotating electrical machine becomes the first voltage, and the anti-middle of any one of the coils in the second multiphase AC rotating electrical machine. A rotating electrical machine drive device comprising: a control device that controls the second inverter so that the sex point side becomes the second voltage.   2. The rotating electrical machine drive device according to claim 1, wherein the control device controls the first and second inverters so that a voltage difference between the first voltage and the second voltage becomes a commercial AC voltage. When the control device further receives an input voltage from the outside to the first and second power lines, the control device uses each coil and the second inverter in the second multiphase AC rotating electric machine to input the input voltage. Controlling the second inverter so that is boosted,
3. The rotating electrical machine drive according to claim 1, wherein the DC power supply is charged by a boosted voltage boosted using each coil and the second inverter in the second multiphase AC rotating electrical machine. apparatus.   The rotating electrical machine drive device according to claim 3, wherein the input voltage is a commercial AC voltage.   The control device turns off each switching element of the first arm of the second inverter corresponding to the coil of the second multiphase AC rotating electrical machine to which the second power line is connected, 5. The rotating electrical machine drive device according to claim 1, wherein switching control is performed on each switching element of the second arm group of the second inverter other than the arm.   The control device includes the second inverter so that a driving force is not generated in the second multiphase AC rotating electric machine when power is exchanged with the outside through the first and second power lines. The rotating electrical machine drive device according to any one of claims 1 to 5, wherein the rotating electrical machine drive device is controlled.   7. The converter according to claim 1, further comprising a converter connected between the DC power supply and a DC line to which the first and second inverters are connected, and controlling the DC line to a predetermined voltage level. A rotating electrical machine drive device according to claim 1.   A vehicle comprising the rotating electrical machine drive device according to any one of claims 1 to 7. An internal combustion engine connected to the first multiphase AC rotating electric machine;
The first multi-phase AC rotating electrical machine converts the power generated by the internal combustion engine into AC power and supplies it to the first inverter,
The first inverter rectifies AC power received from the first multi-phase AC rotating electric machine and supplies the rectified power to the DC power source,
The vehicle according to claim 8, wherein the control device controls the rotational speed of the internal combustion engine in accordance with an external load connected to the first and second power lines.

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