Integrated five freedom electric eddy sensor

An eddy current sensor and degree-of-freedom technology, which is applied in the direction of using electrical/magnetic devices to transmit sensing components, instruments, and electrical devices, can solve problems such as complex structure and large volume, simplify circuit structure, and eliminate beat frequency interference. , the effect of reducing weight

Inactive Publication Date: 2007-06-27
BEIHANG UNIV
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Problems solved by technology

[0004] The technical problem of the present invention is: to overcome the shortcomings of the existing magnetic bearing eddy current displacement sensor with large volume and complex structure, and to provide an integrated, five-degree-o

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  • Integrated five freedom electric eddy sensor
  • Integrated five freedom electric eddy sensor
  • Integrated five freedom electric eddy sensor

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Embodiment Construction

[0018] The integrated, five-degree-of-freedom eddy current sensor 1 is composed of 12 sensor probes (P1 to P12) and corresponding measurement circuits. The present invention can be designed as an inner rotor or an outer rotor structure according to different structural forms of the magnetic bearing rotor. The outer rotor structure of the present invention is shown in Figure 1. Figure 2 is the detection surface of the radial sensor probe, which is the inner surface of the rotor. The detection surface is external to the radial sensor probe. P1 and P2 form a pair along the X axis. The two directions respectively located on the X axis form an angle of 180°. P3 and P4 form a pair along the Y axis, which are located at an angle of 180° in the two directions of the Y axis, and are installed on the outer circumference of the sensor. 8 axial sensor probes (P5~P12) are symmetrically distributed on the two end faces of the sensor in the Z axis direction, 31 and 32 are the axial detection fac...

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Abstract

The current vortex sensor can measure offset deviation signal between actual position and given position of magnetic bearing rotor so as to realize stable control. The sensor is composed of sensor probe, measuring circuit (MC), and shell. Integrated design is adopted for 12 pieces of sensor probe and MC so as to avoid interference brought by extended cables between sensor probes and MC. 4 pieces of radial sensor probe constitute differential type structure (DTS) to detect radial transnational motion of rotor in two orthogonal directions. 8 pieces of axial sensor probe constitute DTS to detect axial transnational motion of rotor, and rotational movement of rotor in two orthogonal directions. Simplifying two sensors configured at two ends in traditional magnetic bearing into one sensor, the invention provides displacement signals in 5 degrees of freedom needed for controlling rotor. The invention is applicable to pose actuator of spacecraft. Features are: reduced size and weight.

Description

Technical field [0001] The invention relates to an eddy current sensor, which is used for high-precision non-contact measurement of the displacement of a magnetic bearing rotor, and is particularly suitable for the magnetic bearing of a spacecraft high-precision attitude actuator that has strict requirements on the volume, weight and accuracy of the sensor. Rotor displacement detection, such as magnetic levitation flywheel, magnetic levitation control moment gyroscope, etc. Background technique [0002] Magnetic bearings have the advantages of no mechanical friction and wear, no need for lubrication and maintenance, and allow high-speed rotation of the rotor, so they are widely used in spacecraft attitude actuators. Magnetic bearings are used to support the flywheel rotor instead of mechanical bearings to eliminate mechanical friction and increase the speed of the rotor, thereby improving the control accuracy of the flywheel and the control moment gyroscope, extending the service...

Claims

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Application Information

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IPC IPC(8): G01D5/12G01D5/16G01B7/02
Inventor 房建成田希晖刘刚刘虎张倩
Owner BEIHANG UNIV
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