Rotor for non-contact angle measurement and angle measuring and calculating method

By distributing arc-shaped recesses on the outer circumference of the motor rotor and combining them with non-contact sensors, the friction loss and reliability problems of traditional motor rotor measurement methods are solved, achieving high-precision non-contact angle measurement and improving system performance and sensor versatility.

CN121966068AActive Publication Date: 2026-05-01CHANGSHA XEMC ELECTRIC TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202610429335.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-02
Publication Date
2026-05-01
Estimated Expiration
2046-04-02

AI Technical Summary

Technical Problem

Existing methods for measuring the rotation angle of motor rotors suffer from problems such as frictional loss, complex installation, and poor long-term reliability. Traditional contact sensors are difficult to use in motor control to achieve high-performance and high-precision angle measurement.

Method used

A non-contact rotor structure is designed by uniformly distributing arc-shaped recesses on the outer circumference of the rotor, using elliptical arcs to form the contour of the recesses, and combining them with a non-contact position sensor to detect signal changes in real time and calculate the rotor angle.

Benefits of technology

It achieves high-precision angle measurement with simple structure and easy processing, eliminates mechanical wear, improves system life and environmental adaptability, and has strong sensor versatility and high measurement accuracy.

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Abstract

The invention discloses a rotor for non-contact angle measurement and an angle measuring and calculating method. The rotor comprises a cylindrical rotor body and a plurality of arc-shaped concave parts which are uniformly distributed along the peripheral surface of the cylindrical rotor body; the outline of each arc-shaped concave part is composed of an elliptical arc, the long axis size of the ellipse is equal to the outer diameter a of the rotor, the short axis size is b, and a is larger than b. The measuring and calculating method comprises the following steps: configuring a position sensor to acquire a distance d to the edge of a rotor in real time; recording the number n of signals generated by the arc-shaped concave part passing through the sensor; calculating an ellipse polar angle alpha according to the distance d in combination with an ellipse polar radius formula; calculating a mechanical angle according to alpha and n; and calculating the electrical angle by combining the motor pole pair number p. According to the invention, non-contact high-precision angle measurement is realized.
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