Method for switching and staring compressor by means of sensorless PMSM (permanent magnet synchronous motor) vector control angle tracking

Abstract

The invention discloses a method for switching and staring a compressor by means of sensorless PMSM (permanent magnet synchronous motor) vector control angle tracking and belongs to the compressor variable frequency driving control technical field. The method includes the following steps that: a vector control mode is adopted to control the compressor; the compressor is started, the preset angle of the rotor of the compressor is set, and the speed of the compressor is gradually increased; in the speed increase process of the compressor, with the preset angle adopted as an iterative value, an iteration method is adopted to estimate the speed and position angle of the rotor; and when the estimated speed of the rotor is stable, the corresponding actual angle of the rotor is determined, the angle difference of the preset angle and the actual angle of the rotor is detected, and closed-loop control is adopted to gradually reduce the angle difference, so that the compressor can enter a self-synchronous operation mode. With the method adopted, the compressor is stable when being started, and the compressor can be switched smoothly, and the operation noises of the compressor can be decreased.

Description

technical field [0001] The invention relates to the field of variable frequency drive control of compressors, in particular to a method for non-inductive PMSM vector control angle tracking switching starting compressors. Background technique [0002] Permanent magnet synchronous motor (permanent magnet synchronous motor, PMSM) has been gradually applied to the inverter compressor of automobile air conditioner due to its remarkable advantages such as small size, high power density and high efficiency. The permanent magnet synchronous motor (PMSM) frequency conversion drive compressor cannot realize the installation of the position sensor due to the compressor design seal, volume, working environment and other reasons. In addition, in order to improve the driving comfort of the car, it is also required to control the noise of the compressor, so the non-inductive The PMSM vector control method has always been one of the main research directions. [0003] It can be seen from th...

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Problems solved by technology

[0003] It can be seen from the working principle and load characteristics of the compressor that the torque of the compressor changes periodically, especially for a period of time, when the compressor is stopped and then restarted, the load is very heavy. A large current will be generated at the moment of closed-loop switching, which is likely to cause instantaneous overcurrent protection. However, the compressor control drive device in the non-inductive operation mode must switch smoothly and reliably. The current starting method cannot meet this requirement well.

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