Permanent magnet synchronous electric spindle speed regulating system and control method thereof

Abstract

The invention belongs to the field of numerical control processing. In order to solve the problem that a permanent magnet synchronous motor has poor fast response capability and is affected by torqueripple, the invention provides a permanent magnet synchronous electric spindle speed regulating system and a control method thereof. The system comprises a main circuit and a control circuit. The maincircuit comprises a power inverter circuit and a permanent magnet synchronous motor. The electric spindle of the permanent magnet synchronous motor is connected with the power inverter circuit. The control circuit comprises a speed regulator, a magnetic flux generator, a torque regulator, a magnetic flux regulator, two current hysteresis comparators, SVPWM, a magnetic flux observer and a voltagevector meter. According to the invention, hybrid drive control is used to replace traditional vector control and direct torque control, so that the system has better fast response capability; torque and magnetic flux are indirectly controlled through a voltage vector switch meter; and the problem of torque ripple generated in a direct torque system is effectively suppressed.

Description

technical field [0001] The invention belongs to the field of numerical control machining, and in particular relates to a speed regulating system of a permanent magnet synchronous electric spindle and a control method thereof. Background technique [0002] As one of the core components of high-precision CNC machine tools, the permanent magnet synchronous electric spindle is a transmission structure that combines the spindle motor and the machine tool spindle. It has the advantages of simple structure, high power factor, good low-speed performance, and low loss. . The vector control realizes the effective decoupling of the excitation current and the torque current of the high-speed electric spindle, and can obtain excellent dynamic performance. The direct torque technology does not need the rotating coordinate transformation in the field-oriented vector control, and directly performs the stator flux linkage and electromagnetic torque. The control system is simple, but the tor...

AI Technical Summary

Problems solved by technology

The direct torque technology does not need the rotating coordinate transformation in the field-oriented vector control, and directly performs the stator flux linkage and electromagnetic torque. The control system is simple, but the torque ripple is more obvious.

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