Radial displacement sensor
A radial displacement and sensor technology, applied in the field of displacement sensors, can solve the problems of low frequency response, large space occupation, and difficult measurement of sensors, and achieve the effects of simple principle structure, improved stability, and improved efficiency
Active Publication Date: 2015-04-15
刘延风
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Problems solved by technology
[0004] The displacement sensor in the prior art takes up a lot of space when it is used to measure the radial displacement of rotating parts such as the rotor. If the radial displacement of the rotor needs to be controlled, it is difficult to design the distance between the measurement point and the execution force point to coincide or be very close
Furthermore, for example, the frequency response of ordinary inductive displacement sensors is low, which is not suitable for fast dynamic measurement, "Sensor Technology" page 81, so it is difficult to measure the displacement of ultra-high speed
The price of the new ultra-high oscillation frequency inductive displacement sensor is very high, and the original signal voltage induced by it is low in microvolts to millivolts, so it must be guided by a high anti-interference electromagnetic shielding wire.
[0005] The structure of ordinary magnetoelectric sensors in the prior art is only used for speed measurement and is not suitable for radial displacement measurement of rotating parts
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[0046] figure 1 The schematic diagram of the arrangement of the permanent magnets along the circumference of the outer rotor. The permanent magnets 2 are arranged along the entire circumference of the rotor 3 and are adsorbed radially on the inner wall of the rotor core 1. The magnetic poles 9 of the permanent magnets 2 face the radial direction. They are arranged along the circumference of the rotor in the order of N-S poles.
[0047] figure 2 Schematic diagram of another kind of circumferential arrangement of permanent magnets along the inner rotor. The permanent magnets 2 are arranged along the entire circumference of the rotor 3 and are adsorbed on the side wall of the rotor core 1 in the circumferential direction. On the outer diameter of the rotor core 1 To form magnetic poles 9, they are arranged along the circumference of the rotor in the order of N-S poles.
[0048] image 3 An arrangement diagram of the coils on the inner stator, the x, y rectangular coordinate s...
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The invention discloses a radial displacement sensor, which is of a passive magnetoelectric type, is specially used for measuring radial displacement of rotating parts, and has the advantages of higher voltage of original signals, high antijamming capability and small volume. Coils (4) of the radial displacement sensor are arranged on a stator (6), and permanent magnetic blocks (2) of the radial displacement sensor are fixedly arranged on a rotor (3), so as to enable magnetic fields of magnetic poles (9) to be arrayed at an air gap (7) in the circumferential direction of the rotor (3) in an N-S sequence; an X-Y rectangular coordinate system is established at the center of the stator (6); the coils (4) are arranged on two opposite sides of each coordinate axis, which are close to the air gap; outgoing lines of the coils (4) on the two opposite sides of each coordinate axis are in hedging connections (8); and when the rotor (3) is rotated, induced electromotive forces are subtracted, so as to obtain signals. The radial displacement sensor adopting the structure has no dynamic frequency response problems, so the measurement accuracy, the sensitivity and the stability of a system when the radial displacement sensor is used for control are greatly improved.
Description
technical field [0001] The invention relates to a displacement sensor, especially a sensor for detecting the radial displacement of a rotating part. It does not have an energy source and obtains displacement signals by magnetic induction. It is an energy conversion or passive magnetoelectric sensor. Background technique [0002] Displacement sensors have formed a fairly large industrial scale, usually inductive displacement sensors including eddy current sensors, capacitive displacement sensors, photoelectric displacement sensors, ultrasonic displacement sensors, Hall displacement sensors, etc. During the signal conversion process, their energy is supplied by an external power source, and they belong to energy-controlled sensors. See "Sensor Technology", Tsinghua University Press, Beijing Jiaotong University Press, edited by Sun Jianmin and Yang Qinghai, first edition in October 2005, page 4. It can also be called an active sensor. [0003] The magnetoelectric sensor is a ...
Claims
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IPC IPC(8): G01B7/02
Inventor 刘延风
Owner 刘延风