Research And Design Of Novel Measurement System Of Angular Position And Velocity

Measurement of angular position and velocity is significant in the field of motor control.The high-precision sensors widely used in the field of motor control at present,have drawbacks like disability to work in extreme environment and high cost.Planar inductive angular position sensor is popular in recent years and it has advantages of simple structure,being well applicable in extreme environment,low cost and so on.Few researches have been done on the sensor and its decoding at home and abroad.Based on planar inductive angular position sensor,this dissertation introduces the measurement system of angular position and velocity designed by the author.Main contents of the dissertation which are also main research work of the author include:First,rotor of the planar inductive angular position sensor is designed and made.This dissertation analyzes electromagnetic principle of the sensor first,then introduces the rotor designed by the author.Experimental result indicates that the rotor designed by the author can work well.Second,synchronous reference frame phase-locked loop based on planar inductive sensor is designed.The algorithm is a brand new application of the improved synchronous reference frame phase-locked loop to planar inductive sensor.Sine and cosine signals acquired by the demodulator contain too much noise.The algorithm is able to reject noise and produces precise measurement values of angular position and velocity.Third,double synchronous reference frame phase-locked loop based on planar inductive sensor is designed.The algorithm is a brand new application of the double synchronous reference frame phase-locked loop to planar inductive sensor.Sine and cosine signals acquired by the demodulator not only contain too much noise,but also are not in the same amplitude and ninety degrees phase difference which is called mismatch.Not only the algorithm is able to reject noise,but also it is able to acquire correct angular position and velocity from the unideal sine and cosine signals.Fourth,prototype of the measurement system of angular position and velocity is designed and made.Experimental tests of the prototype verify the effectiveness of the two algorithms designed by the author.Results of the tests also indicate that the prototype can work well.Fifth,in order to evaluate performance of the prototype,measurement device based on photoelectric encoder is designed and made.