A Current Reversal Power Electronic Controller for Multi-axis Magnetic Bearings

Abstract

The invention discloses a current-inversed electric and electronic controller for a multi-axis magnetic levitation bearing. The electric and electronic controller comprises 2N winding bridge arms and a common bridge arm, wherein N is a degree-of-freedom number of the multi-axis magnetic levitation bearing; the 2N winding bridge arms are divided into N group-A winding bridge arms and N group-B winding bridge arms; a controllable switch is arranged on each winding bridge arm; two controllable switches are arranged on the common bridge arm; the current passing through each winding is controlled by changing on-off time of the controllable switch, so that electromagnetic force in the multi-axis magnetic levitation bearing is controlled. According to the electric and electronic controller disclosed by the invention, the exciting current of each winding is mutually offset at the common joint, the condition that the current of the previous common bridge arm is the sum of current of various winding bridge arms is changed, the current flowing through the controllable switches of the common bridge arm is obviously decreased, loads of switching elements are reduced, and the switching loss is reduced. Moreover, with the adoption of the structure of the common bridge arm, the quantity of electron devices is reduced to a certain degree, the cost is reduced, and the electric and electronic controller has the excellent actual application value.

Description

technical field [0001] The invention belongs to the field of magnetic suspension bearing control, and more specifically relates to a power electronic controller with opposite currents for multi-axis magnetic suspension bearings. Background technique [0002] Electromagnetic bearing refers to the use of electromagnetic force to suspend the rotor, so as to realize the non-contact operation with the stator. Magnetic bearings have the characteristics of no friction, no pollution, and long life. They are used in high-speed, ultra-high-speed and high-performance transmission occasions that require no contact, no lubrication, and no pollution. At present, electromagnetic bearings can be divided into three categories: (1) active magnetic bearings: control the electromagnetic force generated by controlling the current to realize the controlled suspension of the rotor; (2) passive magnetic bearings: use permanent magnets or superconductors to realize the part of the rotor Or all supp...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a power electronic controller with opposite currents for multi-axis magnetic suspension bearings, thereby solving the problem that the structure of the entire control system will change when using traditional topologies such as full bridges. The technical problems of complicated design, high cost, and high current of using the shared bridge arm will cause a large burden on the corresponding devices, and the switching loss is high.

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