Redundant fault-tolerant control system and method for ultra-high-speed permanent magnet synchronous motor

Abstract

The invention discloses a redundancy fault-tolerant control system and method of an ultrahigh-speed permanent magnet synchronous motor. The system includes two completely identical redundancy controlunits, wherein each redundancy control unit comprises a DSP module, an FPGA module, an AD sampling module, a signal conditioning module, a level conversion module, a communication module and a power source management module. The method includes the steps that one signal conditioning module receives direct current bus voltage, three-phase stator voltage and current signals for conditioning; one ADsampling module samples the signals after conditioning and transmits the signals to the corresponding DSP module through the corresponding FPGA module; one DSP module obtains a six-path PWM control signal used for driving the system through a loop-locked direct torque control algorithm and meanwhile judges a generated control signal for blocking PWM; one FPGA module receives the six-path PWM control signal, judges whether or not the output of the PWM control signal of the current FPGA module needs to be blocked, and enables the other redundancy control unit. The method and system are applied to redundancy fault-tolerant control of the ultrahigh-speed permanent magnet synchronous motor and have the advantages of being high in accuracy and great in reliability.

Description

technical field [0001] The invention relates to the field of motor technology, in particular to a redundant fault-tolerant control system and method for an ultra-high-speed permanent magnet synchronous motor. Background technique [0002] The rapid development of processing technology has promoted the rapid development of high-speed and high-precision CNC machine tools. As a key functional component of high-end CNC machine tools, ultra-high-speed motor spindles directly determine the development level of high-end CNC machine tools. High-speed asynchronous induction motors have been widely used in various fields with relatively mature manufacturing processes, and the corresponding drive control technologies are also relatively mature. However, since the asynchronous induction motor uses an induction rotor, the torque density is relatively low, and the rotor loss is serious, which will cause the rotor to generate a lot of heat at high speed, and there are problems such as low ...

AI Technical Summary

Problems solved by technology

However, due to the limitations of control technology, permanent magnet synchronous motors are mostly used in medium and high-speed occasions, which cannot meet the requirements of ultra-high-speed CNC machine tools.

At the same time, when a single control system is currently used more often, when individual components fail, it is easy to cause the entire system to go out of control, which seriously affects the machining accuracy and progress.

Images