Motor rotor position detection method, device and electric vehicle

Abstract

The invention provides a motor rotor position detection method and an apparatus thereof, and an electric automobile. The method comprises the following steps of when a fault signal reported by a spinning decoding chip is determined to be received, acquiring M groups of voltage values and M groups of current values of a motor under a static coordinate system in a current period, wherein the M is a positive integer which is greater than 1; according to the M groups of voltage values and the M groups of current values, calculating M groups of first positions and second positions of a motor rotor; and according to the M groups of first positions and the second positions, determining corresponding position information Ps of the rotor in the current period. By using the method, when the spinning decoding chip generates a fault, position information of the motor rotor can be continuously acquired so that the motor can effectively execute normal control logic; redundancy of the position information of the motor rotor is acquired; and safety during an automobile running process is guaranteed and a user driving experience is improved.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a method and device for detecting the position of a motor rotor and an electric vehicle. Background technique [0002] At present, permanent magnet synchronous machine (PMSM for short) has become the mainstream of electric vehicle drive system due to its advantages of high efficiency, high output torque, high power density and good dynamic performance. Moreover, the permanent magnet synchronous motor can also control the vehicle by using a vector control scheme according to the working characteristics of the electric vehicle. The vector control is based on the accurate acquisition of the motor position signal. Therefore, the acquisition of the motor rotor position signal is a prerequisite for effective and reliable control of the permanent magnet synchronous motor. [0003] In the actual application process, the position signal of the permanent magnet synchronous motor is mostl...

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Problems solved by technology

[0004] However, due to the existence of various high and low voltage components in electric vehicles, when obtaining the position information of the motor rotor, it may be affected by electromagnetic effects generated by various high and low voltage components, which may cause a failure in the detection of the position of the motor rotor, and the position of the motor rotor cannot be obtained. And other information, which leads to the failure of the normal control logic of the motor to be effectively executed, affecting the driving safety of the vehicle

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