Method for detecting position of magnet in non-contact magnetic motion
A non-contact, detection device technology, applied to the components of the pumping device for elastic fluids, measuring devices, non-variable displacement pumps, etc., can solve the problem of inability to know the bearing wear and the actual position of the inner rotor shaft and the degree of offset, the inability to obtain the actual position of the passive magnet and the spool, etc., to achieve the effect of wide application prospects
Active Publication Date: 2021-09-28
ZHEJIANG UNIV
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Problems solved by technology
In the magnetic force valve, the passive magnet and the spool will be axially shifted and vibrate due to the impact of the fluid, and because the magnetic valve is usually fully enclosed, the actual position of the passive magnet and the spool cannot be obtained; in the magnetic force pump, There will be wear between the inner rotor shaft and the bearing, resulting in eccentric rotation of the inner rotor shaft, and since the magnetic pump is usually a fully enclosed structure, the actual position and offset degree of the inner rotor shaft cannot be obtained, so the wear of the bearing cannot be known Happening
Method used
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[0036] The present invention will be further described below in conjunction with the drawings and embodiments.
[0037] Embodiments of the present invention are as follows:
[0038] Example I
[0039] Such as figure 1As shown, an embodiment includes a magnetic valve spool chamber 7, a magnetic valve outer ring assembly, a spool assembly, a Hall sensor 9 and an ultrasonic linear displacement sensor 11; the magnetic valve spool chamber 7 remains fixed, and the magnetic valve spool chamber The bottom of 7 is fixedly equipped with an ultrasonic linear displacement sensor 11, and the bottom of the magnetic valve core cavity 7 is fixed with a spool base and a spool bottom cover, and an ultrasonic linear displacement sensor 11 can be fixedly installed through the spool base and spool bottom cover; specific implementation The bottom of the magnetic valve spool cavity 7 is installed on a vibration platform, and the vibration platform can impact the magnetic valve spool 10 .
[0040]...
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The invention discloses a method for detecting the position of a magnet in non-contact magnetic motion. According to the method, a Hall sensor and an ultrasonic linear displacement sensor are combined to detect the absolute position of a to-be-detected magnet, the Hall sensor is arranged on an active magnet and moves along with an active magnet, magnetic field change interference caused by position change of the active magnet is eliminated, magnetic field change of a passive magnet is detected, and the relative position of the passive magnet relative to the active magnet is output through signals. According to the method, the problem of position detection of the permanent magnet movement mechanism in a closed cavity is solved, many technical problems of incapability of accurate detection, low precision, interference and the like caused by single sensor detection are solved, and the method has a wide application prospect in the field of closed cavity magnetic coupling sensing and control.
Description
technical field [0001] The invention relates to a magnet position detection method, in particular to a magnet position detection method for detecting non-contact magnetic force movement. Background technique [0002] The magnetic coupling is a non-contact coupling. It is generally composed of two magnets inside and outside. The two magnets are separated by an isolation cover in the middle. The passive magnet is connected to the driven part, and the active magnet is connected to the power part. The magnetic coupling adopts the principle of magnetic coupling to realize the transmission of force and torque between the driving shaft and the driven shaft without direct contact, and can change the dynamic seal into a static seal to achieve zero leakage. [0003] Magnetic couplings are widely used in magnetic valves and magnetic pumps. In the magnetic force valve, the passive magnet and the spool will be axially shifted and vibrate due to the impact of the fluid, and because the m...
Claims
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IPC IPC(8): F04D29/044F04D29/048F04D15/00F16K31/06F16K37/00G01B21/00
CPCF04D29/044F04D29/048F04D15/00F04D15/0088F16K31/0675F16K37/0083G01B21/00
Inventor 胡亮龚轩刘明潇阳东阮晓东苏芮付新
Owner ZHEJIANG UNIV