Axial active magnetic suspension bearing capable of reducing current ripples
A magnetic bearing, current ripple technology, applied in the direction of shaft and bearing, bearing, mechanical equipment, etc., can solve the problem of control current ripple and other problems, and achieve the effect of reducing current ripple and power consumption
Inactive Publication Date: 2009-09-30
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] figure 1 It is a schematic diagram of the composition of an axial active magnetic suspension bearing capable of reducing current ripple of the present invention. Among them, the power inductor (5) and the other power inductor (6) use soft magnetic materials with good high-frequency magnetic characteristics as the magnetic core, and the maximum operating current of the power inductor is required to be no less than the maximum excitation current of the axial magnetic bearing excitation coil; The inductance value is between 2mH-3mH when the switching frequency of the switching power amplifier is switched; the change of the inductance value of the power inductor from 50HZ to the switching frequency of the switching power amplifier does not exceed 40%.
[0010] Power inductors can be purchased directly from related manufacturers, or you can design your own. If you design yourself, a large number of standard models of magnetic cores with good high-frequency magnetic properties a...
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The invention relates to an axial active magnetic suspension bearing capable of reducing current ripple, which belongs to the magnetic suspension bearing. In the magnetic suspension bearing, a power inductor is connected in series with the lead-out line of the positive magnetic pole exciting coil (5) and the lead-out line of the negative magnetic pole exciting coil (2), respectively, and the two inductors (5, 6) are respectively connected to the power amplifier (7) output terminal. By adding two power inductors, the current ripple of the excitation coil of the axial active magnetic suspension bearing can be reduced, and the power consumption of the axial active magnetic suspension bearing can be reduced without changing the mechanical structure of the original system or the control parameters of the active magnetic suspension bearing. , does not affect the performance of the active magnetic suspension bearing, the required components are easy to obtain, and have great practical value.
Description
Technical field [0001] The invention belongs to the technical field of power electronics and is applied to active magnetic suspension bearing systems. Background technique [0002] Active magnetic suspension bearings use controllable electromagnetic force to achieve non-contact support to the rotor. Active magnetic 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 bearings. When current flows through the excitation coils, a magnetic field is generated in the magnetic circuit, thereby The rotor generates electromagnetic attraction. The active magnetic bearing control system controls 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 a power amplifier. In order to improve the efficiency of the power amplifier, switching power amp...
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IPC IPC(8): F16C32/04
Inventor 徐龙祥崔东辉
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS