A hybrid magnetic bearing and its control method

Abstract

The invention relates to a hybrid magnetic bearing and a control method thereof. The problems that an existing hybrid magnetic bearing can not ensure dynamic distribution of magnetic poles and is poor in balance are solved. The hybrid magnetic bearing comprises a stator, a rotor and a control system, wherein the stator comprises a permanent magnet array and an electromagnet array, the electromagnet array is at least composed of above 6 electromagnets, the quantity of which is an even number, the control system comprises switch pairs, a power amplifier driver and a digital signal processor, the digital signal processor comprises an ADC (Analog to Digital Converter) unit and a CPU (Central Processing Unit) which are connected with each other, each switch pair is correspondingly connected to an electromagnet coil, the ADC unit is connected to each electromagnet coil, the CPU is connected with the power amplifier driver, and the power amplifier driver controls and connects the switch pairs. The hybrid magnetic bearing has the advantages that the attributes of magnetic poles are dynamically distributed and controlled so that the balance of the magnetic bearing is good; by adopting a self-sensing technology, the stability of a rotor system is ensured, the cost is lowered, the space does not need to be occupied, and the maintenance and calibration are simple.

Description

technical field [0001] The invention relates to the field of non-contact magnetic suspension bearings, in particular to a hybrid magnetic bearing and a control method for multi-state distribution of bearing magnetic poles with better balance. Background technique [0002] Magnetic suspension bearing, also referred to as magnetic bearing for short, is a new type of high-performance bearing that uses the magnetic force between the stator and the rotor to suspend the rotor in space, so that there is no mechanical contact between the stator and the rotor. Since there is no mechanical contact between the stator and the rotor, the rotor of the magnetic suspension bearing can reach a very high operating speed, and has the advantages of small mechanical wear, low energy consumption, long life, no lubrication and no pollution, especially suitable for high speed , vacuum, ultra-clean and nuclear and other special applications. [0003] Magnetic suspension bearings can be divided into...

AI Technical Summary

Problems solved by technology

[0007] The present invention mainly solves the problem that the existing hybrid magnetic bearing can only adjust the rotor balance by controlling the supporting force of the magnetic poles, and cannot dynamically distribute the magnetic poles, and the balance is insufficient. Magnetic poles are dynamically allocated for support and damping properties, a hybrid magnetic bearing with better balance, and a control method for the bearing

[0008] Another object of the present invention is to solve the problem that the existing hybrid magnetic bearing needs to install a rotor displacement sensor in the bearing to detect the rotor position, the cost is high, the installation and wiring take up space, and the maintenance and calibration are difficult. It provides a self-sensing Hybrid magnetic bearing of technology, and the control method of the bearing

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