Inductance type rotation position sensor

Abstract

The invention provides an inductance type rotation position sensor. According to the technical scheme, detection is realized based on the principle that stator inductance changes with angles when a rotor rotates, and a specific insulating material and a brand-new arrangement structure are adopted for low-temperature operation of the sensor. Specifically, a mechanical structure and an electrical structure are designed by adopting an inductance measurement method, so that the structure of the device can be remarkably simplified. Low-temperature-resistant insulating materials are adopted, and enough mechanical strength can be guaranteed through the enameled wire, the insulating sleeve and the paint dipping process. In the detection process, alternating current or alternating voltage can be applied to the sensor coil. After the generated alternating voltage and alternating current are measured, a low-frequency signal is output through the signal processing circuit, then a synthesized vector is obtained through Clark conversion, and the angle of the sensor is obtained by calculating the angle of the synthesized vector. The sensor has a good detection effect, the applicable temperature range of the sensor is remarkably widened, meanwhile, a complex system structure is not needed, and low product cost can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of rotor position sensors, in particular to an inductive rotary position sensor. Background technique [0002] The motor is the core mechanical device to realize electric drive, and its application is very extensive; in the control of the motor, the position sensor plays an indispensable role. The task of the position sensor is to measure the angle of the motor rotor, which is generally installed on the motor shaft, and sends the position information to the controller through an electrical signal through a wire. For different motors, different types of sensors can be used, such as photoelectric encoders, magnetoelectric encoders, resolvers, Hall sensors, etc. Currently used position sensors are used in consumer, industrial or military fields, and their temperature range will not exceed -55°C to 150°C at most. [0003] However, in some working conditions (such as special occasions where the motor is immerse...

AI Technical Summary

Problems solved by technology

However, most permanent magnet materials have weakened magnetism at low temperatures, causing this type of sensor to fail to work properly.

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