Axial active magnetic suspension bearing capable of reducing current ripples
A magnetic levitation bearing and current ripple technology, which is applied in the direction of shafts and bearings, bearings, mechanical equipment, etc., can solve the problems of controlling current ripple, etc., and achieve the effect of reducing current ripple and power consumption
Inactive Publication Date: 2008-07-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
In the switching power amplifier, the power device works in the switching state, which improves the efficiency, but at the same time inevitably causes the control current in the excitation coil to have ripples
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[0009] Fig. 1 is a schematic diagram of the composition of the axial active magnetic suspension bearing capable of reducing current ripple in the present invention. Among them, the power inductor 5 and the other power inductor 6 use soft magnetic materials with good high-frequency magnetic properties as magnetic cores, and the maximum operating current of the power inductor is required to be not less than the maximum excitation current of the excitation coil of the axial magnetic suspension bearing; The switching frequency of the power amplifier is between 2mH-3mH; the inductance value of the power inductor does not change more than 40% within the range from 50HZ to the switching frequency of the switching power amplifier.
[0010] Power inductors can be purchased directly from related manufacturers or designed by themselves. If you design your own, there are a large number of standard models of magnetic cores with good high-frequency magnetic properties that can be purchased ...
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The invention provides an axial active magnetic suspension bearing which can reduce a current ripple, belonging to a magnetic suspension bearing. The magnetic suspension bearing is respectively connected in series with a power inductor at the lead-out wire of a positive magnetic pole excitation coil (5) and the lead-out wire of a negative magnetic pole excitation coil (2); the two inductors (5, 6) are respectively connected with the output terminal of a power amplifier (7). By adding two power inductors, the current rippler of the axial active magnetic suspension bearing excitation coil can be reduced, the power loss of the axial active magnetic suspension bearing can be reduced without changing the mechanical structure of the original system and without changing the control parameters of the active magnetic suspension bearing, the performance of the active magnetic suspension bearing is not affected, the required devices are easy to be obtained, and the invention has extremely great practical value.
Description
technical field [0001] The invention belongs to the technical field of power electronics and is applied to an active magnetic suspension bearing system. Background technique [0002] Active magnetic suspension bearings use controllable electromagnetic force to realize non-contact support for the rotor. Active magnetic suspension bearings generate electromagnetic force based on the principle of electromagnets, that is, a certain number of turns of excitation coils are wound on the stator poles of active magnetic suspension bearings. When current passes through the excitation coils, a magnetic field will be generated in the magnetic circuit. The rotor generates electromagnetic attraction. The active magnetic bearing control system controls the magnitude of the electromagnetic force by controlling the current in the excitation coil. The active magnetic bearing control system controls the current in the excitation coil through the power amplifier. In order to improve the effi...
Claims
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IPC IPC(8): F16C32/04
Inventor 徐龙祥崔东辉
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS