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

Abstract

The invention relates to a method, device and equipment for detecting an initial position angle of a permanent magnet synchronous motor rotor, which belongs to the technical field of motors. The method comprises the steps of determining a target voltage space vector based on a preset number of voltage space vectors applied to the direct axis direction of a motor, wherein the amplitude of each voltage space vector is the same, but the position angle is different, and the target voltage space vector is a voltage space vector corresponding to the maximum current amplitude, judging whether the position angle of the target voltage space vector is a specific position angle or not, and if not, acquiring quadrature-axis current data when the direct-axis current is zero at a given rotating speed and direct-axis current data when the quadrature-axis current is zero, and acquiring the initial position angle of the rotor through the quadrature-axis current data and the direct-axis current data. The problem that the detection precision of the initial position angle of the rotor of the permanent magnet synchronous motor is adversely affected by external signal interference or load factors can be solved.

Description

technical field [0001] The application belongs to the field of motor technology, and in particular relates to a detection method, device and equipment for the initial position angle of a rotor of a permanent magnet synchronous motor. Background technique [0002] For permanent magnet synchronous motors, due to the existence of permanent magnets, only when the permanent magnet magnetic field and the stator magnetic field rotate synchronously and in the same direction can the permanent magnet synchronous motor start and run smoothly. We generally call the position of the center line of the permanent magnet a permanent magnet synchronous motor. the rotor position. Due to the existence of the zero position deviation of the position sensor, there will be an angular deviation between the rotor position obtained by the permanent magnet synchronous motor drive system from the position sensor and the real position of the rotor. This angular deviation is called the initial position de...

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Problems solved by technology

[0005] For this reason, this application provides a detection method, device and equipment for the initial position angle of the permanent magnet synchronous motor rotor, which helps to solve the adverse effects on the detection accuracy of the initial position angle of the permanent magnet synchronous motor rotor due to external signal interference or load factors The problem

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