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Contactless radial position sensor having improved response behavior to target defects

A non-contact, electromagnetic sensor technology, applied in the direction of converting sensor output, using electric/magnetic devices to transmit sensing components, instruments, etc., can solve problems such as rotor bumpy motion, magnetic bearings do not expect control signals, etc., and achieve easy interference signals Effect

Inactive Publication Date: 2020-09-11
MEKOS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Any deviation from perfect rotational symmetry such as deformations, nicks, scratches or dents will generate additional disturbance signals in the sensor output which may lead to undesired control signals for the magnetic bearing, resulting in a jerky motion of the rotor

Method used

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  • Contactless radial position sensor having improved response behavior to target defects
  • Contactless radial position sensor having improved response behavior to target defects
  • Contactless radial position sensor having improved response behavior to target defects

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0073] The transducer assembly 1 according to the first embodiment of the invention is Figure 1 to Figure 5 Shown in the figure. The transducer assembly 1 is configured to define a hollow outer rotor radially surrounding the transducer assembly 1 (not in Figure 1 to Figure 5 The radial position shown in the figure). Thus, the transducer assembly 1 is configured to interact with a target surface on the inner circumference of the hollow rotor.

[0074] The transducer assembly 1 includes a first transducer 100 and a second transducer 100'. Each transducer 100, 100' includes a loop coil support 110, 110'. The loop coil supports 110, 110' define a common longitudinal axis L ( image 3 ). At one axial end, the transducer assembly 1 comprises a conductive annular base plate 120 . The transducers 100, 100' are separated by a conductive shield ring 130. At the other axial end of the transducer assembly, the transducer assembly includes a conductive annular top plate 140 ....

no. 2 approach

[0106] Figure 16A transducer unit 1' according to a second embodiment of the invention is illustrated. The transducer unit 1' of the second embodiment is very similar to the transducer unit 1 of the first embodiment. However, the outer circumference of the second transducer 100' is covered by an annular, metallic reference target 180 arranged at a fixed radial distance from the first and second coils of the second transducer 100'. distance. In order to accommodate the reference target 180, the coil support of the second transducer has a slightly reduced outer diameter compared to the coil support of the first transducer.

[0107] exist Figure 17 A possible application of the transducer unit 1' with the second embodiment is illustrated in a highly schematic manner in . Similar parts are used with Figure 15 denoted by the same reference numerals. Again, for simplicity, rotor 300 is illustrated as an inner rotor, but rotor 300 could also be an outer rotor. In this embod...

no. 3 approach

[0111] will refer to Figure 18 A transducer according to a third embodiment will be described. While the first and second embodiments are designed to interact with an outer rotor, the third embodiment is designed to be used with an inner rotor.

[0112] In general, it is easier to implement the invention with an external rotor. In this case, the coil interacts radially outward with the target. The coils can be arranged in the slots from the outside and will be held by the hooks of the coil support without any other measures. This is not the case when the transducer is designed to interact with the internal rotor. In this case, specific measures need to be taken to avoid the coils falling inside and touching the inner rotor. Therefore, it is proposed to also mount the coil to the coil support from the outside, similarly to the first and second embodiments. The coil is then filled with resin, and the coil support is turned from the inside until only a thin film remains bet...

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PUM

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Abstract

A contactless electromagnetic sensor (1) for determining a radial position of a rotor. The contactless electromagnetic sensor (1) comprises a transducer (100) that comprises one or more coils. Excitation circuitry is connected to the transducer to energize the transducer. Processing circuitry derives at least one position signal indicative of a radial position of the rotor based on the transducersignals. In order to enable simplified compensation for disturbance signals resulting from target imperfections, the coils have sensitivity to a target material that varies sinusoidally along the circumferential direction.

Description

technical field [0001] The invention relates to a non-contact electromagnetic sensor for determining the radial position of a rotor, a transducer suitable for use in such a non-contact electromagnetic sensor and a corresponding method for determining the radial position of the rotor. Background technique [0002] Non-contact electromagnetic sensors, especially eddy current sensors and inductive sensors (also known as magnetoresistive sensors), are commonly used to monitor the axial, radial or angular (i.e., rotational) position of a rotor suspended in a magnetic bearing arrangement . [0003] An eddy current sensor typically includes a transducer connected to an excitation circuit and a processing circuit, the transducer including at least one detection coil. An excitation circuit excites a high-frequency alternating current in the transducer. The high-frequency current generates an alternating electromagnetic field that induces eddy currents in nearby conductive objects o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/20F16C32/04
CPCF16C32/0446G01D5/2013G01D5/202G01D5/204G01D5/2046
Inventor 菲利普·布勒
Owner MEKOS AG
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