A kind of motor driving device and electric vehicle

Abstract

A motor drive device and an electric vehicle can improve the utilization rate of storage batteries. The motor drive device includes a drive circuit and a main controller that output three-phase alternating current, wherein: the drive circuit includes a U-phase electric drive circuit, a V-phase electric drive circuit, and a W-phase electric drive circuit; each phase electric drive circuit includes n The battery and n electric drive units corresponding to the n batteries one by one, the signal terminals of the n electric drive units are connected to the main controller, the input terminals of the n electric drive units are connected to the corresponding batteries, and the output terminals of the n electric drive units are connected to the main controller. connected to output one phase of the above-mentioned three-phase alternating current; wherein, n is a positive integer; the main controller, for each phase of the electric drive circuit in the drive circuit, determines the voltage of the n storage batteries in the phase electric drive circuit. The output voltage adjustment coefficient of each of the n electric drive units in the phase electric drive circuit is output to the corresponding electric drive unit.

Description

Technical field [0001] The present invention relates to the technical field of automatic control, in particular to a motor drive device and an electric vehicle. Background technique [0002] In the prior art, motor drive devices in electric vehicles and other equipment such as figure 1 As shown, it mainly includes a series-connected battery pack 101 and a three-phase inverter 102. [0003] However, in the series-connected battery pack 101, due to differences in the initial capacity, internal resistance, and self-discharge rate of the batteries, the charge and discharge characteristics of the batteries are also different, and after the batteries are charged and discharged for many times, the difference is further enlarged. , Resulting in the reduction of battery capacity and output power, and lower battery utilization. Summary of the invention [0004] The embodiment of the present invention provides a motor drive device and an electric vehicle, which can improve the utilization rat...

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Problems solved by technology

[0003] However, in the battery pack 101 connected in series, due to differences in the initial capacity, internal resistance, self-discharge rate, etc. of each battery, there are also differences in the charging and discharging characteristics of each battery, and the difference is further enlarged after the battery is charged and discharged many times. , leading to a decrease in battery capacity and output power, and a lower battery utilization rate

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