A matrix converter-based three-pole magnetic bearing operation control system and method

Abstract

The invention discloses a matrix converter-based three-pole magnetic bearing operation control system and method. According to the control system and method of the invention, a three-phase to three-phase matrix converter is utilized to directly convert electric energy; a DSP and a CPLD are adopted as controllers; the on-off of nine bidirectional switch tubes of the matrix converter is controlled; with the output current of the matrix converter adopted as control quantity, a three-pole magnetic bearing is directly driven; the rotor of the three-pole magnetic bearing can be suspended stably through adopting a double-hysteresis current control method based on closed-loop adjustment of the whole control system; an energy storage link of a direct-current side large capacitor for driving and controlling the three-pole magnetic bearing can be omitted, and therefore, the reliability of the system can be improved; and three-phase input voltage is divided into 12 phase regions, and each input phase is involved in modulation in a whole period, and therefore, input current waveforms can be improved, and input-side current harmonics can be reduced.

Description

technical field [0001] The invention relates to a three-pole magnetic bearing drive control technology, in particular to a control system and method for applying a matrix converter to drive a three-pole magnetic bearing, and belongs to the field of high-speed motor transmission. Background technique [0002] Magnetic bearings use magnetic field force to suspend the rotor in the air without contact, and the suspension position can be controlled by the control system. Compared with traditional bearings, magnetic bearings have many outstanding advantages such as no friction and wear, no lubrication, high speed, high precision, and long life. In recent years, magnetic suspension bearings have been used in centrifuges, high-speed precision CNC machine tools, electromechanical batteries, steam turbines It has been applied in generators, turbomolecular pumps, life sciences and other fields. [0003] For three-pole hybrid or active magnetic bearings, use the equivalent magnetic cir...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that each input phase does not participate in modulation for 1 / 3 of the time, which will make the input current on the power side rich in harmonic content

The characteristics of three-pole magnetic bearings are similar to those of permanent magnet synchronous motors. Its coils can be regarded as concentrated windings on the motor stator, and its coils are resistive and inductive loads. Therefore, this method can also be used to drive three-pole magnetic bearings, but it will make the power supply side Rich content of input current harmonics

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