Variable-frequency speed regulation system and method of high-speed permanent magnet motor

Abstract

The invention discloses a variable-frequency speed regulation system and a variable-frequency speed regulation method of a high-speed permanent magnet motor. The variable-frequency speed regulation system comprises an L filter, a diode rectifier, a Z-source inverter, a high-speed permanent magnet synchronous motor, a controller, a driving module, a voltage and current Hall detection module, a stator current Hall detection module, a photoelectric encoder angle measurement module and an overvoltage and overcurrent protection module. The Z-source inverter is introduced into the variable-frequency speed regulation system of the high-speed permanent magnet motor to substitute a conventional inverter so as to flexibly control AC output voltage, so that the sustainable normal working capability of the speed regulation system during a voltage drop failure is improved; by virtue of a characteristic that the Z-source inverter allows an upper switch tube and a lower switch tube to be directly connected, the problem of current harmonic, caused by dead time, in the conventional inverter is solved, so that the reliability and electromagnetic interference resistance of the speed regulation system are improved.

Description

technical field [0001] The invention belongs to the field of electromechanical technology, and relates to a high-speed permanent magnet motor frequency conversion speed regulation system and method, in particular to a high-speed permanent magnet motor frequency conversion speed regulation system and method based on a voltage type Z source inverter. Background technique [0002] The existing high-speed motor speed control system composed of a diode rectifier and a traditional voltage source inverter has many limitations in practical application due to the limitation of the topology of the traditional voltage source inverter itself. First of all, the traditional voltage-type inverter is a step-down inverter, its output voltage is lower than the grid voltage, and the output voltage range is very limited, which limits the overload operation capability and speed regulation range of the high-speed motor itself to a certain extent. Secondly, the traditional voltage source inverter ...

AI Technical Summary

Problems solved by technology

In practical applications, electromagnetic interference may cause false conduction of the switching tube of the inverter bridge, causing the bridge arm to enter a straight-through state, resulting in damage to the switching tube

Therefore, they are less reliable and less resistant to electromagnetic interference

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