Multi-motor synchronous/asynchronous driving system of electric vehicle

Abstract

The invention provides a multi-motor synchronous / asynchronous driving system of an electric vehicle, which can reduce the cost of the system and output multiple mutually independent motor driving system loops. The synchronous / asynchronous driving system comprises a plurality of inverter bridges, and a direct-current bus, a pre-charging circuit, a supporting capacitor, a cooling system, a detection signal and a control power supply shared by the inverter bridges; and all the parts except the cooling system are electrically connected together, and the cooling system is mechanically connected. The outputs of all the motor inverter bridge driving loops are independent without influencing the work of one another, and even when one path or multiple paths of the loops do not work or fails temporarily, other loops can continue to work.

Description

technical field [0001] The invention relates to the field of motor drive, in particular to an electric vehicle multi-motor synchronous / asynchronous drive system. Background technique [0002] There are more and more motors used in 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 complicat...

AI Technical Summary

Problems solved by technology

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. , which makes the system more complicated and the overall cost is higher

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

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