Operation Control Method of AC Magnetic Bearing Motorized Spindle Based on Matrix Converter

Abstract

The invention discloses a system and a method for controlling the running of an alternating current magnetic bearing electro spindle based on matrix converters. A three-phase voltage regulator is connected with three-phase commercial power and used as a three-phase input power supply, and then connected with a three-phase LC filter and two matrix converters to form an three-phase input. Two radial tripolar magnetic bearings in the five-degree-of-freedom alternating current magnetic bearing electro spindle are respectively driven by the outputs of the two matrix converters, axial magnetic bearings are driven and controlled by connecting a direct current power supply with a switching power amplifier, the matrix converters and the switching power amplifier are controlled by a driving controller, and a rotating shaft of the electro spindle realizes five-degree-of-freedom suspension. Electric energy is directly converted by the matrix converters, so that the reliability is improved. The three-phase input voltage of the radial tripolar magnetic bearings is divided into 12 phase zones, so that each input phase is involved in modulation in the whole period. Input current waveforms are improved, and input-side current harmonics are reduced.

Description

technical field [0001] The invention relates to a drive control technology for a five-degree-of-freedom AC magnetic bearing electric spindle, in particular to a control technology for applying a matrix converter to drive a five-degree-of-freedom AC magnetic bearing electric spindle, 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 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, and steam turbines Machines, turbomolecular pumps, life sciences and other fields have been applied. [0003] The five-degree-of-freedom ...

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 the three-pole magnetic bearing and the permanent magnet synchronous motor are similar. Its coil can be regarded as a concentrated winding on the motor stator, and its coil is a resistive load. Therefore, although this method can also be used to drive the three-pole in the AC magnetic bearing electric spindle Magnetic bearing, but will make the input current harmonic content rich on the power supply side

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