阅读说明：本技术 多组多相旋转电机的驱动装置 (Driving device for multi-group multi-phase rotating motor ) 是由 渡边益崇 榎木圭一 西岛良雅 原田信吾 于 2017-05-17 设计创作，主要内容包括：在直流电源与多组多相功率转换装置之间的连接被切断时,利用控制装置对开关元件进行控制,以在不同的定时阶段性地使构成多组多相功率转换装置的多组功率转换装置分别从相短路转移至全相断路。(When the connection between the dc power supply and the plurality of sets of multiphase power converters is disconnected, the switching elements are controlled by the control device so that the plurality of sets of multiphase power converters constituting the plurality of sets of multiphase power converters are switched from the phase short circuit to the full-phase open circuit in stages at different timings.)

1. A drive device of a multi-group multi-phase rotary electric machine that drives a plurality of groups of multi-phase rotary electric machines, the multi-group multi-phase rotary electric machine comprising:

a plurality of groups of multiphase armature windings independent of each other; and excitation magnetic poles constituted by permanent magnets, the multi-group multi-phase rotary electric machine being characterized by comprising:

a plurality of groups of multiphase power converters each including a power converter provided corresponding to the plurality of groups of multiphase armature windings and configured to convert power between the corresponding group of multiphase armature windings and a dc power supply;

a filter capacitor connected to a direct current side of the plurality of groups of multiphase power conversion devices; and

a control device configured to be able to individually control a plurality of sets of the power conversion devices,

the plurality of sets of power conversion devices are each constituted by a plurality of switching elements controlled by the control device,

the control device is configured to, when the connection between the dc power supply and the plurality of multiphase power conversion devices is disconnected,

the switching elements are controlled so that the plurality of groups of the power conversion devices are switched from the phase short circuit to the full-phase open circuit in a stepwise manner at different timings.

2. The drive device of a plurality of sets of multiphase rotary electric machines according to claim 1,

the estimated value of the induced voltage of the multi-phase rotating electrical machines is less than or equal to a predetermined voltage value

When one of the plurality of sets of power conversion devices is in an operating state satisfying the following expression (1),

[ mathematical formula 3]

Wherein the content of the first and second substances,

c, the electrostatic capacitance of the filter motor,

V_ov: the voltage of the power supply that is allowed,

V_dc: the voltage currently charged to the filter capacitor,

l: the inductances of the plurality of groups of multi-phase rotating electrical machines,

I_1st: an effective value of a current flowing through one of the power conversion devices,

the control device is configured to control the switching elements such that one of the power conversion devices is switched from the phase short circuit to the all-phase open circuit.

3. The drive device of a plurality of sets of multiphase rotary electric machines according to claim 2,

when one of the power conversion devices is in the phase short-circuit state, and

when another power conversion device other than one of the plurality of sets of power conversion devices is in an operating state satisfying the following expression (2),

[ mathematical formula 4]

C, the electrostatic capacitance of the filter motor,

V_ov: the voltage of the power supply that is allowed,

V_dc: the voltage currently charged to the filter capacitor,

l: the inductances of the plurality of groups of multi-phase rotating electrical machines,

I_2st: an effective value of a current flowing through the other one of said power conversion devices,

the control device is configured to control the switching element so that the other power conversion device is switched from the phase short circuit to the all-phase open circuit.

4. The drive device of a plurality of sets of multiphase rotary electric machines according to any one of claims 1 to 3,

the control device is configured to, when the plurality of sets of power conversion devices are in the fully open state,

the switching elements are controlled so that the plurality of groups of the power conversion devices are shifted to phase short circuits in stages at different timings, respectively.

5. The drive device for multi-group multi-phase rotary electric machines according to claim 4,

upon transition from the full phase open circuit to a three phase short circuit,

the control device is configured to control the switching elements so that another power conversion device other than one of the plurality of power conversion devices is switched from a full-phase open circuit to a three-phase short circuit at a timing when a q-axis current flowing through the one of the plurality of power conversion devices is positive.

6. The drive device for multi-group multi-phase rotary electric machines according to claim 4,

upon transition from the full phase open circuit to a three phase short circuit,

the control device is configured to cause one of the plurality of sets of power conversion devices to transition from the full-phase open circuit to the three-phase short circuit and then cause another power conversion device other than the one power conversion device to transition from the full-phase open circuit to the three-phase short circuit after a predetermined time has elapsed after the transition from the full-phase open circuit to the three-phase short circuit.

Technical Field

The present invention relates to a drive device for a rotating electric machine mounted on a vehicle or the like, and more particularly to a drive device for a multi-phase rotating electric machine having a plurality of sets of independent multi-phase armature windings for a stator and a permanent magnet for a rotor.

Background

In recent years, hybrid vehicles and electric vehicles have attracted attention as vehicles taking energy saving and environmental considerations into account. The hybrid vehicle uses an electric motor as a power source in addition to a conventional engine. In addition, the electric vehicle uses only the electric motor as a power source. Both hybrid vehicles and electric vehicles drive a motor by converting direct current stored in a battery into alternating current through an inverter, and use the motor as a power source.

In general, in a hybrid vehicle, a Motor Generator (Motor Generator) having a power generation function is used as a power source for running the vehicle. The rotating electric machine configured as a motor generator generates electric power using rotational energy generated when the engine is driven, and regeneratively generates electric power using rotational energy from tires during idling of the vehicle. The ac power generated by the rotating electric machine is converted into dc power by an inverter and stored in a battery.

In the conventional rotating electrical machine driving device configured as described above, when a phenomenon occurs in which the connector provided in the control device is disconnected from the power supply conductor connected to the battery or a breaker or the like inserted between the connector and the power supply conductor is put into a released state during the power generating operation of the rotating electrical machine, energy supplied from the rotating electrical machine to the battery is supplied to the dc charging unit of the inverter in the control device, and a rapid voltage rise may occur in the dc charging unit of the inverter. A rapid voltage rise in the dc charging unit of the inverter may cause a failure such as deterioration or breakage of a circuit element constituting the inverter or a control device including the inverter.

In order to suppress the occurrence of such a failure, for example, in a conventional drive device for a rotating electrical machine disclosed in patent document 1, overvoltage determination means for determining an overvoltage of an output circuit of the rotating electrical machine is provided, and when the overvoltage determination means determines that the output circuit of the rotating electrical machine is an overvoltage, the power conversion device constituted by an inverter is controlled to set the rotating electrical machine in a phase short-circuited state, thereby reducing a jump in a power supply voltage and rapidly decreasing the power supply voltage. This protects the circuit elements and devices used in the control device from voltage-induced damage, deterioration, and the like.

Disclosure of Invention

Technical problem to be solved by the invention

In the conventional rotating electric machine driving device disclosed in patent document 1, since the rotating electric machine is always short-circuited in three phases when the connection between the control device and the battery is disconnected, a braking torque is generated in the rotating electric machine due to a short-circuit current flowing through the rotating electric machine, and the kinetic energy of the vehicle is reduced. Further, if the rotating electric machine is in a three-phase short-circuited state, the induced voltage of the rotating electric machine cannot be used to supply power to other in-vehicle devices. Therefore, it is necessary to switch the rotating electrical machine from the three-phase short-circuited state to the full-phase open state.

However, when the rotating electrical machine is brought into the all-phase shutdown state, the current flowing through the rotating electrical machine is rapidly cut off at the time of a three-phase short circuit, and therefore, a jump in the power supply voltage occurs due to the magnetic energy of the motor coil. Due to this power supply voltage jump, there may be a problem that a circuit element used in the control device or a load of the rotating electrical machine is deteriorated or damaged by an overvoltage.

When the rotating electrical machine is driven by the engine, the rotational speed of the rotating electrical machine increases, the induced voltage of the rotating electrical machine increases, and the power supply voltage of the inverter becomes an overvoltage, the rotating electrical machine needs to be switched from the full-phase open state to the three-phase short-circuited state. However, if the rotating electrical machine is brought into a three-phase short-circuited state, the braking torque generated in the rotating electrical machine becomes stable to a constant value after the transient property becomes large, and therefore, the braking torque of the rotating electrical machine largely fluctuates, which causes deterioration of the behavior of the vehicle and deterioration of drivability, and also causes fluctuation of the engine speed, and in the worst case, may cause the engine to stop.

The present invention has been made to solve the above-described problems of the conventional drive device for a rotating electrical machine, and an object of the present invention is to provide a drive device for a rotating electrical machine that can suppress overvoltage generated when a full-phase short circuit is performed from a full-phase short circuit (for example, a three-phase short circuit) and can reduce fluctuation of braking torque when a full-phase short circuit is performed from a full-phase short circuit (for example, a three-phase short circuit), even when the connection between the drive device for a rotating electrical machine and a battery is disconnected.

Technical scheme for solving technical problem

A drive device for a multi-group multi-phase rotating electrical machine according to the present invention is a drive device for a multi-group multi-phase rotating electrical machine that drives a multi-group multi-phase rotating electrical machine, the multi-group multi-phase rotating electrical machine including:

a plurality of groups of multiphase armature windings independent of each other; and excitation magnetic poles constituted by permanent magnets, the multi-group multi-phase rotary electric machine being characterized by comprising:

a plurality of groups of multiphase power conversion devices each including a power conversion device provided corresponding to the plurality of groups of multiphase armature windings and configured to convert power between the corresponding group of multiphase armature windings and a dc power supply;

a filter capacitor connected to a direct current side of the plurality of groups of multiphase power conversion devices; and

a control device configured to be able to individually control a plurality of the power conversion devices,

the plurality of sets of power conversion devices are each constituted by a plurality of switching elements controlled by the control device,

the control device is configured to, when the connection between the dc power supply and the plurality of multiphase power conversion devices is disconnected,

the switching elements are controlled so that the plurality of groups of the power conversion devices are switched from the phase short circuit to the full-phase open circuit in a stepwise manner at different timings.

In the present invention, a multi-phase rotating electrical machine includes a plurality of multi-phase armature windings.

Effects of the invention

According to the multiple rotary electric machines of the present invention, even if the connection between the drive device of the rotary electric machine and the battery is disconnected, the overvoltage generated when the full-phase disconnection is performed from the full-phase short circuit (for example, three-phase short circuit) is suppressed to protect the motor control device and other in-vehicle equipment from damage and deterioration due to the voltage, and the fluctuation of the braking torque when the full-phase short circuit is performed from the full-phase disconnection (for example, three-phase short circuit) can be reduced to improve the vehicle stability.

Drawings

Fig. 1 is a schematic configuration diagram of a vehicle in which a drive device for a rotating electric machine according to embodiments 1 and 2 of the present invention is mounted.

Fig. 2 is a schematic configuration diagram of a drive device for a rotating electric machine according to embodiment 1 and embodiment 2 of the present invention.

Fig. 3 is a flowchart showing the operation of the rotating electric machine driving device according to embodiment 1 of the present invention.

Fig. 4 is a flowchart showing the operation of the rotating electric machine driving device according to embodiment 2 of the present invention.

Fig. 5 is a waveform diagram showing waveforms of three-phase currents and a charge voltage of an inverter when the rotating electric machine is fully phase-disconnected from a three-phase short-circuited state in a situation where power cannot be exchanged between the battery and the inverter.

Fig. 6 is a waveform diagram showing waveforms of three-phase currents of the drive devices of the rotating electric machines according to embodiments 1 and 2 of the present invention and waveforms of charging voltages of the inverters in the case where the rotating electric machine is fully phase-disconnected from a three-phase short-circuited state in a situation where power cannot be exchanged between the battery and the inverter.

Fig. 7 is a waveform diagram showing waveforms of three-phase currents and a waveform of torque of the rotating electric machine in a case where the rotating electric machine is three-phase short-circuited from a fully-phase open circuit state in a situation where power cannot be exchanged between the battery and the inverter.

Fig. 8 is a waveform diagram showing waveforms of three-phase currents and waveforms of torque of the rotating electric machine in the driving device of the rotating electric machine according to embodiments 1 and 2 of the present invention in the case where the rotating electric machine is three-phase short-circuited from the fully open state in a situation where power cannot be exchanged between the battery and the inverter.

Detailed Description

Hereinafter, preferred embodiments of a drive device for a rotating electric machine according to the present invention will be described with reference to the drawings. In the drawings, the same reference numerals denote the same or corresponding parts.

First, a configuration of a rotating electric machine that is a control target of a driving device of the rotating electric machine according to embodiments 1 and 2 of the present invention and a configuration of a vehicle mounted with the rotating electric machine will be described. The structure of the rotating electric machine and the structure of the vehicle described here are also common to embodiment 2 described later. Fig. 1 is a schematic configuration diagram of a vehicle mounted with a drive device for a rotating electric machine according to embodiment 1 and embodiment 2 of the present invention, and shows a parallel hybrid vehicle.

In fig. 1, an engine 1001 is a power source that drives a vehicle. Power generated by engine 1001 is transmitted to transmission 1006 via a rotor shaft (not shown) that fixes a rotor of electric motor 1002, and is transmitted from transmission 1006 to tires 1007 of the vehicle, and tires 1007 are rotated to run the vehicle.

The motor 1002 is a so-called permanent magnet type rotating electrical machine configured as a motor generator having a power generation function, and the stator has a plurality of armature winding groups independent of each other, and the rotor has a field pole made of a permanent magnet. Electric motor 1002 is used as a power source for starting engine 1001 and assisting the running of the vehicle. When there is a request for deceleration of the vehicle or a request for charging the battery 1005, a regenerative operation is performed to charge the battery 1005.

The inverter 1003 as a power conversion device converts direct current charged to the battery 1005 into alternating current to drive the motor 1002. In contrast, the inverter 1003 supplies regenerative ac power from the motor 1002, and converts the regenerative ac power into dc power to charge the battery 1005.

The contactor 1004 is a switch for performing power exchange or disconnection between the inverter 1003 and the battery 1005. The switch 1004 has the following functions: when an abnormal current flows through battery 1005 or the like, a circuit between battery 1005 and inverter 1003 is cut off to protect battery 1005.

The battery 1005 exchanges power with the inverter 1003 and supplies power to other components of the vehicle.

Transmission 1005 transmits power from engine 1001 and motor 1002 to tires 1007 at an optimum speed and torque.

In each embodiment of the present invention described later, a parallel hybrid vehicle shown in fig. 1 is described as an example, but the present invention can be applied to all vehicle forms in which an electric motor is mounted.

In each of the embodiments described below, a configuration having one motor, one inverter, and one battery is described, but the following configuration may be adopted: the electric vehicle includes a plurality of rotating electric machines as motor generators, a plurality of inverters, and a plurality of batteries, and includes a DC/DC converter or the like that performs voltage conversion between each rotating electric machine and the inverter or between each battery and the inverter.

In each of the embodiments described below, a case where the electric motor 1001 is configured by a permanent magnet type rotating electric machine having a rotor with a permanent magnet as described above is described, but the electric motor 1001 may be an excitation electric motor or the like having no permanent magnet, and in this case, the same effects as those of the permanent magnet type rotating electric machine can be obtained by obtaining a magnetic flux generated by the rotor portion of the electric motor and obtaining a voltage induced in the stator of the electric motor.

In each of the embodiments described below, a case will be described where the rotating electrical machine is a double three-phase rotating electrical machine including 2 sets of three-phase armature windings, but the present invention is not limited to this, and a rotating electrical machine including three or more phases or 2 or more sets of armature windings may be used.