Radial displacement sensor and rotor radial displacement detection system of magnetically levitated molecular pump
A radial displacement and sensor technology, applied in instruments, pump control, measuring devices, etc., can solve the problems of poor signal transmission quality and poor interchangeability, achieve interchangeability, ensure signal quality, and facilitate promotion and application. Effect
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Embodiment 1
[0058] This embodiment provides a radial displacement sensor, the signal output end of which is connected to the signal input end of the demodulation unit in the magnetic levitation molecular pump controller 2, and the voltage amplitude range of the output signal meets the requirements of the demodulation unit for the input signal voltage amplitude. Value range requirements, including:
[0059] The displacement sensor stator 20 is fixedly arranged in the pump body 3 of the magnetic levitation molecular pump, and the inner wall of the displacement sensor stator 20 is evenly provided with 2 N poles, N is an integer and 2≤N≤5, 2 N poles form four pole pairs, each pole pair contains 2 N-2 magnetic poles, the four magnetic pole pairs include X positive magnetic pole pair, X negative magnetic pole pair, Y positive magnetic pole pair and Y negative magnetic pole pair, the X positive magnetic pole pair and the X negative magnetic pole pair form An X-direction magnetic pole pair grou...
Embodiment 2
[0077] Such as Figure 5 As shown, in this embodiment, the X-direction adjustment module includes one X-direction rheostat 23a, the X-direction rheostat 23a is connected in parallel with the X-direction detection module, and the adjustment end of the X-direction rheostat 23a is the The voltage signal output end of the X-direction adjustment module, the connection point between the X positive coil and the X negative coil is the voltage signal output end of the X-direction detection module, and the X-direction adjustment module The voltage difference between the voltage signal output terminal and the voltage signal output terminal of the X-direction detection module is used as the X-direction output signal of the radial displacement sensor;
[0078] The Y-direction adjustment module includes a Y-direction rheostat 23b, the Y-direction rheostat 23b is connected in parallel with the Y-direction detection module, and the adjustment terminal of the Y-direction rheostat 23b is the vo...
Embodiment 3
[0082] In this embodiment, the inner wall of the displacement sensor stator 20 is uniformly provided with eight magnetic poles N=3, as figure 2 As shown, each magnetic pole pair contains two magnetic poles, wherein the magnetic pole pair I is the X positive magnetic pole pair, the magnetic pole pair III is the X negative magnetic pole pair, and the magnetic pole pair I and the magnetic pole pair III form the X direction The magnetic pole pair group, the magnetic pole pair I and the magnetic pole pair III are respectively provided with the X-direction magnetic pole pair coil 22a, and the X-direction magnetic pole pair coil 22a on the magnetic pole pair I is connected to the magnetic pole pair III. The X-direction magnetic pole pair coil 22a is connected in series, the X-direction magnetic pole pair coil 22a on the magnetic pole pair I is the X forward coil, and the X-direction magnetic pole pair coil 22a on the magnetic pole pair III is The X negative coil;
[0083] The magne...
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