Kinetic energy feedback voltage interruption protection system and method for magnetic suspension bearing
A magnetic levitation bearing and voltage interruption technology, applied in the field of magnetic levitation, can solve problems such as inability to withstand the falling load of the rotor system, imperfect spare bearings, etc., and achieve the effects of saving use costs, improving reliability, and improving real-time performance
Active Publication Date: 2022-02-01
NORTHEASTERN UNIV LIAONING
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Problems solved by technology
At present, the structural design of the backup bearing is not perfect, and when the magnetic bearing circuit is disconnected, it often cannot withstand the falling load of the entire rotor system
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[0031] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that descriptions such as "first" and "second" in the present invention are used for description purposes only, and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features.
[0032] On the one hand, the present invention provides a kinetic energy feedback voltage interruption protection system for magnetic suspension bearings, such as figure 1As shown, it includes a three-phase AC power supply 1, a magnetic levitation motor 3, a frequency converter 2, a first transformer 4, a second transformer 7, a first rectifying device 5, a second rectifying device 8, a Boost device 9, and a power switching device 6 , displacem...
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The invention provides a kinetic energy feedback voltage interruption protection system and method for a magnetic suspension bearing, and relates to the technical field of magnetic suspension. The system includes a three-phase AC power supply, a frequency converter, a transformer, a rectifying device, a Boost device, a displacement controller, a displacement sensor, a power switching device and a magnetic levitation motor. When the power supply is normal, the system directly obtains the DC voltage value required by the displacement controller from the three-phase alternating current after step-down and rectification processing, so that the displacement controller sends out a driving current to drive the rotor to suspend, and the power supply is cut off. When the motor is converted from the electric state to the power generation state, the kinetic energy of the motor is converted into the voltage required by the displacement controller through kinetic energy feedback; that is, the electricity generated by the magnetic levitation motor is processed by step-down and rectification, and then the boost process is applied to the motor. The voltage sent out is adjusted by an appropriate amount to obtain the voltage value required by the displacement controller, and then the power supply is switched to power the displacement controller.
Description
technical field [0001] The invention belongs to the technical field of magnetic suspension, and in particular relates to a kinetic energy feedback voltage interruption protection system and method of a magnetic suspension bearing. Background technique [0002] Magnetic suspension bearings are used in various fields such as medicine and aviation because of their advantages of no friction, low loss and long maintenance cycle. At present, the magnetic levitation motor has become a research hotspot because of its extremely high speed. However, in factories, the phenomenon of sudden voltage interruption cannot be ignored. If the voltage is suddenly interrupted, the controller will not work, the magnetic bearing will lose the drive current, and the rotor will fall on the stator at a high speed, damaging the stator and even the motor. [0003] In the magnetic levitation motor, the general magnetic bearing system needs to be equipped with a backup bearing system. When the machine ...
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IPC IPC(8): H02P29/032H02P29/028H02P25/022
CPCH02P29/032H02P29/028H02P25/022H02P2207/05
Inventor 杨东升张佳男张化光李华马占超罗艳红
Owner NORTHEASTERN UNIV LIAONING