Displacement detection method for weak coupling of detection coil and magnetic bearing
A detection coil and displacement detection technology, applied in the direction of measuring devices, using electromagnetic means, instruments, etc., can solve the problems of unfavorable rotor displacement and high-precision measurement, and achieve the effects of high integration, improved stability, and high space utilization
Active Publication Date: 2021-08-13
NAVAL UNIV OF ENG PLA
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Problems solved by technology
In this detection coil winding scheme, the change of the detection coil inductance is not only affected by the change of the rotor position, but also interfered by the change of the magnetic flux of the magnetic bearing, and does not use high-precision measurement of the rotor displacement
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[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0018] The invention discloses a displacement detection method for the weak coupling between the detection coil and the magnetic bearing. The detection coil is wound on the teeth of the stator core of the magnetic bearing, so that the magnetic flux passing through the detection coil formed by the magnetic bearing approaches zero, and the adjacent The two detection coils are connected in series to form an inductance, and the displacement detection of the rotor is realized by detecting the change of the inductance value of the inductance. The change of the inductance value of the inductor is detected by an AC bridge detection circuit or a resonant frequency of a resonant circuit.
[0019] Among them, two inductors symmetrically connected along the central axis of the stator core of the magnetic bearing are connected in series to form a ...
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The invention relates to the technical field of motor state sensing and monitoring, and discloses a displacement detection method for weak coupling of a detection coil and a magnetic bearing. According to the invention, the detection coil is wound on the teeth of the stator core of the magnetic bearing, so that the magnetic flux which is formed by the magnetic bearing and penetrates through the detection coil is close to zero; and the two adjacent detection coils are connected in series to form an inductor, and the displacement detection of the rotor is realized by detecting the inductance value change condition of the inductor. According to the displacement detection method for weak coupling of the detection coil and the magnetic bearing, the cost and the size of a magnetic bearing system can be effectively reduced, the positions of the sensor and the actuator are the same, bearing rotor displacement in-situ detection can be achieved, and the rotor control stability is further improved.
Description
technical field [0001] The invention relates to the technical field of motor state perception and monitoring, in particular to a displacement detection method for weak coupling between a detection coil and a magnetic bearing. Background technique [0002] Magnetic bearings have the advantages of no mechanical friction and wear, no lubrication, and small damping, and have been widely used in many fields. As an important part of the magnetic bearing system, displacement detection plays a vital role in the stable control of the magnetic bearing. In a sense, the performance of the displacement sensor directly affects the accuracy of the stable suspension of the magnetic bearing rotor. [0003] At present, the displacement sensor commonly used in the magnetic bearing system is the eddy current displacement sensor, but its structure is complex and the cost is high, and the installation displacement of the displacement sensor and the displacement of the magnetic bearing actuator ar...
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IPC IPC(8): G01B7/02H02K11/225
CPCG01B7/02H02K11/225
Inventor 李文印王东胡靖华苏振中吴超李志
Owner NAVAL UNIV OF ENG PLA