Method and device for detecting initial position of rotor of permanent magnet synchronous motor

Abstract

The invention provides a method and a device for detecting the initial position of a rotor of a permanent magnet synchronous motor. The method comprises the following steps: applying voltage vectors lasting for preset time in different directions to a to-be-detected motor; acquiring a corresponding current value of the to-be-detected motor in each voltage applying direction; obtaining a current sampling signal of the to-be-detected motor based on the different voltage applying directions and the corresponding current values; carrying out filtering processing on the current sampling signal based on a polynomial smoothing algorithm; and determining the initial position direction of the rotor of the to-be-detected motor based on the filtered current sampling signal. Noise signals distributed in different voltage applying directions are filtered by using a polynomial smoothing algorithm, the signal-to-noise ratio of current sampling signals is improved, the accuracy of rotor initial position identification is further improved, current sampling values in different voltage applying directions are processed, the requirement for applying a voltage vector is reduced, the identification operation process is simpler and more convenient, and the initial position of the rotor can be accurately identified in a current measurement value with a low signal-to-noise ratio.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method and device for detecting the initial position of a rotor of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors have the advantages of small size, light weight, high energy density, and high operational reliability. With the emergence of permanent magnets with high coercive force and high remanence in recent years, permanent magnet synchronous motors have received more and more attention. Among them , the sensorless control technology of permanent magnet synchronous motor has become a research hotspot in the field of motor control. The key step of the sensorless control technology is to obtain the initial position of the rotor, based on which the motor can be started smoothly and the sensorless control of the permanent magnet synchronous motor can be realized. [0003] According to the different rotor technology,...

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Problems solved by technology

[0005] In view of this, the embodiment of the present invention provides a method and device for detecting the initial position of the rotor of a permanent magnet synchronous motor, so as to overcome the difficulty in accurately identifying the current measurement value of the low signal-to-noise ratio in the identification method of voltage vector injection in the prior art The problem with the initial position of the rotor

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