Motor rotor position sensor and method for measuring position of motor rotor

Abstract

The invention discloses a motor rotor position sensor and a method which precisely measures the rotor position by the sensor; the rotor position sensor comprises an objective disc which is arranged on the objective rotor, provided with a sine/cosine curved shape and made of conductive, an inductive element which is fixed in the shell of a motor, corresponding to the objective disc and provided with a plane winding, and an ASIC circuit which is connected with the induction circuit; the method completes the operation of precisely measuring the rotor position by using a DSP to process the signal induced by the rotor position sensor; the sensor meets the automobile standard, is not affected by the magnetic field of the motor stator winding, and has the advantages of high performance and low cost. The method used for precisely measuring the position and rotation speed of the rotor of the motor can be uniformly completed by the DSP device; therefore, the sensor and the method can precisely measure the position and speed of the motor rotor; furthermore, the device has simple structure and low cost.

Description

technical field [0001] The invention relates to a sensor and a measurement method using the sensor, in particular to a sensor used in a hybrid electric vehicle to measure the rotor position of a permanent magnet synchronous motor as a hybrid electric motor. A sensor based on the principle of eddy current effect, a method of accurately measuring the rotor position using this sensor. Background technique [0002] In order to ensure the smooth rotation of the motor and the precise control of the motor, it is not only necessary to control the armature current, but also to detect the accurate rotor position. Accurate rotor position detection can ensure that the sine curve of the motor current is synchronized with the corresponding rotor position, avoiding the conduction commutation torque fluctuation. At present, there are mainly two methods to accurately detect the rotor position: the position sensor measurement method and the method without position sensor technology to measur...

AI Technical Summary

Problems solved by technology

At present, there are two main methods to accurately detect the rotor position: the position sensor measurement method and the position sensorless technology to measure the rotor position. The position sensor method mainly includes the application of encoder, resolver and Hall position sensor technology to detect the rotor position signal. ;Whether it is an encoder, a Hall position sensor or a resolver, there are related circuits to determine the rotor position, which will be affected by the magnetic field of the motor stator winding when used, and some sensors such as resolvers are also measured when the motor rotor speed is low low precision

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