CN102136817A - Multi-motor synchronous/asynchronous driving system of electric vehicle - Google Patents

Abstract

The invention provides a multi-motor synchronous/asynchronous drive system for an electric vehicle. The drive system can reduce system cost and output multiple independent motor drive system loops. The electric vehicle multi-motor synchronous/asynchronous drive system of the present invention includes a plurality of inverter bridges and a DC bus shared by the plurality of inverter bridges, a pre-charging circuit, a supporting capacitor, a cooling system, a detection signal and a control power supply, and each part except the cooling The system is realized by mechanical connection, and other parts are realized by electrical connection. The outputs of the drive circuits of the motor inverter bridges in the present invention are independent and do not affect the work of each other. Even if one or several circuits are temporarily out of work or faulty, the remaining circuits can continue to work.

Description

A multi-motor synchronous/asynchronous drive system for electric vehicles

technical field

The invention relates to the field of motor drive, in particular to an electric vehicle multi-motor synchronous/asynchronous drive system.

Background technique

There are more and more motors used in current electric vehicles. In addition to the high-power drive motor system as the main power source, it will also include the oil pump motor used to drive the oil pump, the air pump motor used to drive the air pump, and the motor used to drive the cooling system. The water pump or fan motor of the system, etc. In the existing electric vehicle design, these motors are generally designed separately, and each driving motor must have an independent motor control system (controller). ) to convert DC to AC. In order to prevent failures, filtering and peak voltage absorption must be performed at the DC input. These design tasks not only require separate calculations and designs, but also require different filter circuits. , so that the system is more complicated, and the overall cost is relatively high. In addition, in order to control, all drive systems need to collect the voltage or current signal of the DC circuit, which further increases the system cost.

Contents of the invention

The technical problem to be solved by the present invention is to provide an electric vehicle multi-motor synchronous/asynchronous drive system capable of simplifying the calculation and design process, reducing system cost, and outputting multiple independent motor drive circuits.

The electric vehicle multi-motor synchronous/asynchronous drive system of the present invention includes a plurality of inverter bridges and a pre-charging circuit shared by a plurality of inverter bridges, a DC bus, a supporting capacitor, a detection signal, a cooling system and a control power supply. The cooling system is realized by mechanical connection and is realized by electrical connection.

In the electric vehicle multi-motor synchronous/asynchronous drive system of the present invention, the outputs of the inverter bridge circuits are independent and do not affect each other. Even if one or several circuits are not working or malfunction temporarily, the remaining circuits can continue to work.

Description of drawings

The accompanying drawing is a schematic diagram of an electric vehicle multi-motor synchronous/asynchronous drive system of the present invention.

Detailed ways

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The electric vehicle multi-motor synchronous/asynchronous drive system of the present invention includes a plurality of inverter bridges and a DC bus shared by the plurality of inverter bridges, a pre-charging circuit, a supporting capacitor, a cooling system, a detection signal and a control power supply.

The electric vehicle multi-motor synchronous/asynchronous drive system of the present invention uses a shared DC bus to supply power to the inverter bridge drive circuits of each motor, and the DC bus is electrically connected to the pre-charging circuit, supporting capacitors, and multiple inverter bridges.

The electric vehicle multi-motor synchronous/asynchronous drive system of the present invention uses a shared pre-charging circuit. When the voltage of the DC bus is higher than the voltage at both ends of the supporting capacitor, the relay is disconnected, and when it is detected that the voltage at both ends of the supporting capacitor is within the allowable range, the relay is closed, and the pre-charging circuit stops charging.

The electric vehicle multi-motor synchronous/asynchronous drive system of the present invention uses a shared support capacitor to support the output voltage, keep the output voltage stable, and filter out the low-order harmonic current of the output voltage.

The electric vehicle multi-motor synchronous/asynchronous drive system of the present invention uses a shared cooling system to cool the driving systems of each inverter bridge, and the cooling system and each inverter bridge are realized by mechanical connection.

The electric vehicle multi-motor synchronous/asynchronous drive system of the present invention uses a common detection signal device to check the DC power supply system. The variable bridge control circuit is realized through electrical connection.

The electric vehicle multi-motor synchronous/asynchronous drive system of the present invention uses a shared control power supply, and all the motor inverter bridges in the system use the control power supply to supply power to the inverter bridge control circuit, and the control power supply and each motor inverter bridge pass through the electrical The connection is achieved.

The electric vehicle multi-motor synchronous/asynchronous drive system of the present invention can output at least two motor inverter bridge drive system loops, and these drive loops can be completely independent in logic, do not affect each other, and independently drive the corresponding motor system; at the same time, all The drive loops can also communicate with each other and coordinate control, thereby enhancing the configuration flexibility of the system.

The drive motor circuits output by the electric vehicle multi-motor synchronous/asynchronous drive system of the present invention are independent of each other in terms of machinery and circuits, and do not interfere with each other. Even if one (several circuits) of them is damaged or suspended, other circuits can work as usual. Affected. This configuration enhances the redundancy performance of the system and provides technical support for the timely repair of the system.

The motor systems corresponding to the drive motor circuits of the electric vehicle multi-motor synchronous/asynchronous drive system of the present invention can work in different working modes, so that when some motors work electrically and some motors work to generate electricity, the timely recovery of electric power can be realized Utilization, that is, the electric energy generated by part of the motor is directly distributed to other motor systems that are working electrically on the DC bus without feeding back to the battery, which enhances the utilization rate of power feed.

Claims (4)

1. the many motor synchronous of electric automobile/asynchronous drive system comprises the shared dc bus of a plurality of inverter bridge and a plurality of inverter bridge, pre-charge circuit, support electric capacity, cooling system, detection signal and control power supply.

Shared dc bus is each motor inverter bridge drive circuitry, dc bus and pre-charge circuit, supports between electric capacity, a plurality of inverter bridge by being electrically connected realization.

Shared pre-charge circuit, when the voltage of dc bus was higher than the voltage that supports the electric capacity two ends, relay disconnected, when detecting the voltage during that supports the electric capacity two ends in the scope that allows, relay closes, pre-charge circuit stops charging.

Shared support electric capacity supports output voltage, keeps output voltage stabilization, and the low-order harmonic electric current of filtering output voltage.

Shared cooling system cools off each inverter bridge drive system, and cooling system and each inverter bridge realize by mechanical connection.

Shared detection signal device is checked DC power system, and all inverter bridge control circuits are all shared the signal of this detection signal device in the system, and detection signal device and each motor inverter bridge control circuit are by being electrically connected realization.

Shared control power supply, all motor inverter bridge all adopt this control power supply to power for the inverter bridge control circuit in the system, and control power supply and each motor inverter bridge are by being electrically connected realization.

2. can export two-way motor inverter bridge drive system loop at least according to the many motor synchronous of the described electric automobile of claim 1/asynchronous drive system, these drive the loop can be logically independent fully, be independent of each other the corresponding electric system of drive; Simultaneously, all driving loops also can intercom mutually, coordinate control, thereby have strengthened the configuration flexibility of system.

3. separate on machinery and circuit according to each drive motors loop of the many motor synchronous of the described electric automobile of claim 1/asynchronous drive system output, mutually noninterfere, even a road (a few road) wherein damaged or suspended and use, can work as usual in other loops, unaffected.This configuration has strengthened the redundant performance of system, for can in time repairing of system provides technical support.

4. can be operated under the different mode of operations according to each pairing electric system in drive motors loop of the many motor synchronous of the described electric automobile of claim 1/asynchronous drive system, work in the part motor powered like this, and part electric power generation when work, can realize the timely recycling of electric weight, be that electric energy that the part motor sends is just directly distributed to other electric systems in electronic work on dc bus, and do not need to feed back to storage battery, strengthened the feed utilance.

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