Motor phase loss detection method and device

Abstract

The invention discloses a phase loss detection method of a motor, comprising the following steps: when the phase current of the motor is zero, obtaining a first current variable and a first digital variable corresponding to the current digital quantity D0; by controlling the d-axis of the motor The given current minimizes the peak value of the phase current when the motor is running as the first current variable; detects the phase current digital quantity D of the motor in real time, and compares the absolute value of the phase current digital quantity D with the first digital variable; if the phase current digital quantity If the absolute value of the quantity D is less than the first digital variable and the duration is greater than the time threshold TD0, it is judged that the motor is out of phase. The lack of phase detection method of the motor can not only detect in real time whether there is a lack of phase before and during the operation of the motor, but also can accurately detect whether any phase of the motor has a phase loss; compared with the control method in which the d-axis current is zero, it can improve the salient The output torque performance of the motor does not affect the output torque performance of the hidden pole motor. The invention also discloses a motor phase loss detection device.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a motor phase loss detection method and a motor phase loss detection device. Background technique [0002] When the motor controller is used to detect the phase current of the motor, the phase current signal of the collected motor is generally converted into a voltage analog signal through the current-voltage conversion module, and then the voltage analog signal is converted into a digital quantity through the analog-to-digital conversion module , and finally the program in the motor controller controls the motor through digital quantities. [0003] When the motor controller is used to detect the lack of phase of the motor, the motor controller collects the phase current of the motor in real time, and compares the converted phase current digital quantity with the converted phase current digital quantity when the motor is no-load. If the final phase current digital value is less t...

AI Technical Summary

Problems solved by technology

However, due to the noise interference of the voltage analog signal and the resolution problem of the analog-to-digital conversion module, the converted digital quantity superimposes the amount of noise, resulting in misjudgment of motor phase loss, especially for controlling the d-axis current to be zero (I d =0) for the permanent magnet motor, in the motor deceleration process, when the required torque to maintain the command deceleration is equal to the load torque, the output torque of the motor is zero, and now the q-axis current is zero (I q =0), while the d-axis current is also zero (I d =0), that is, the phase current of the motor is zero, which will lead to misjudgment of phase loss

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