Device and method for controlling series winding of magnetic suspension bearing with optimized bridge arm current stress

Abstract

The invention discloses a magnetic suspension bearing series winding control device and method for optimizing the current stress of a bridge arm, belonging to the field of magnetic suspension bearing control, including 8 unidirectional conduction devices, 8 controllable switches, 4 windings and a power supply. The conduction time of the control switch in one switching cycle controls the current passing through each winding, so as to realize the control of the electromagnetic force in the magnetic suspension bearing. In the present invention, four windings are connected in series, and the current direction in the windings is the same, and only five bridge arms are needed for controlling the four windings of a single eight-pole radial magnetic bearing. The invention adopts the structure of the series winding to reduce the number of electronic devices and ensure the voltage utilization rate. In the present invention, the bias currents of each winding cancel each other in the common bridge arm, which improves the situation that the current stress of the shared bridge arm is relatively large in the previous structure, reduces the current burden of the switching device, and reduces the switching loss and conduction loss at the same time , has good practical application value.

Description

technical field [0001] The invention belongs to the field of magnetic suspension bearing control, and more specifically relates to a control device and method for a series winding of a magnetic suspension bearing for optimizing bridge arm current stress. Background technique [0002] Magnetic suspension bearing is a bearing device that uses electromagnetic force to levitate the rotor, thereby replacing traditional mechanical bearings and realizing non-contact operation between the rotor and the stator. There is no mechanical contact between the rotor and the stator, and it has the characteristics of no lubrication, no mechanical friction, no pollution, and long working life. Magnetic suspension bearings are widely used in energy storage flywheels, aviation equipment and other applications where the rotor needs to rotate at a high speed or has relatively high requirements for the working environment. [0003] For the active magnetic suspension bearing system, it mainly inclu...

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Problems solved by technology

[0005] In view of the defects of the prior art, the object of the present invention is to provide a magnetic suspension bearing series winding control device and method for optimizing the current stress of the bridge arm, aiming at solving the problem of excessive current stress of the bridge arm in the existing series winding controller

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