Sensorless control device for AC permanent magnet synchronous motor and starting method of control device

Abstract

The invention discloses a sensorless control device for an AC permanent magnet synchronous motor and a starting method of the control device. The control device comprises a DC power supply providing DC, wherein the DC power supply is connected with a three-phase inverter bridge, and the output end of the three-phase inverter bridge is connected with a permanent magnet synchronous motor; the three-phase inverter bridge and the permanent magnet synchronous motor are also connected with a DSP (Digital Signal Processing) control board for acquiring current and voltage signals and modulating PWM (Pulse Width Modulation) signals, and the DSP control board is connected with a touch screen for displaying permanent magnet synchronous motor parameters and adjustment functions. The sensorless starting method comprises the following steps of: starting, initializing, configuring a register, configuring software parameters, loop-waiting, executing an interrupt routine and returning. In the invention, the permanent magnet synchronous motor can be quickly started by an I-F vector control mode, the motor is smoothly switched to a speed and current double closed-loop vector control mode by a switching method, and the switching process is smooth without current surge.

Description

technical field [0001] The invention belongs to the field of AC permanent magnet synchronous motor control, and in particular relates to a control device and a starting method for an AC permanent magnet synchronous motor without a position sensor. Background technique [0002] AC permanent magnet synchronous motors have the advantages of high power density, high torque / inertia ratio, and good maintainability, and have been widely used in many fields such as servo systems, aerospace, and military equipment. The present invention takes the surface-mounted permanent magnet synchronous motor as the research object. The surface-mounted permanent magnet synchronous motor generally adopts the vector control of the double closed-loop of the speed and current, which can realize the decoupling of the motor stator current torque component and the excitation component, so the motor produces The electromagnetic torque is stable, and it has good overload capacity and starting and braking ...

AI Technical Summary

Problems solved by technology

When using vector control technology, it is necessary to obtain information such as the position and speed of the motor magnetic poles in real time. This information is generally obtained through a position sensor. However, the position sensor increases the cost of the motor and the difficulty of installation, reducing the reliability of the system.

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