Control method for smooth start of permanent magnet synchronous motor with position sensorless vector control

Abstract

The invention discloses a position sensorless vector control method for smooth start of a permanent magnet synchronous motor. After the permanent magnet synchronous motor is started, it is set to a constant torque operation mode or a constant speed operation mode. The smooth start control method includes: open loop Control, drive the motor with Iq_max as the target value of the q-axis current. Under open-loop control, when the actual steady-state speed V of the motor reaches the first target speed V_ref1, it enters the constant speed closed-loop control mode; the constant speed closed-loop control stage, Use the q-axis current PI control loop to slowly converge the q-axis real-time detection current value Iq1 to Iq0; in the speed closed-loop control mode, raise the first target speed V_ref1 to the highest target speed V_max to control the motor operation, and then enter constant rotation torque control mode. It can ensure smooth and stable starting, reduce vibration and noise of motor operation, and improve starting reliability.

Description

Technical field: [0001] The invention relates to a smooth start control method of a position sensorless vector control permanent magnet synchronous motor. Background technique: [0002] At present, there are generally three control methods for position sensorless vector control permanent magnet synchronous motors: constant torque control mode, constant speed control mode, or constant air volume control mode. [0003] For example, the position sensorless three-phase synchronous motor vector controller disclosed in US Pat. No. 7,525,269 only discloses a current torque control mode for constant torque control. [0004] Chinese patent CN103929109 (A) also discloses a constant speed control method based on position sensorless vector control permanent magnet synchronous motor. [0005] Such as figure 1 As shown, the general block diagram of constant torque control is shown as figure 1 As shown, since the torque T is only related to the q-axis current, according to the torque ca...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a smooth start-up control method of a position sensorless vector control permanent magnet synchronous motor, which mainly solves the problem of starting the permanent magnet synchronous motor based on the position sensorless vector control under the constant torque operation mode in the prior art. Unstable start, large motor vibration and noise, easy to cause start failure, unreliable technical problems

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