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Research On Sensorless Control Of Psrm Based On Voltage Injection And Core Loss Calculation

Posted on:2020-01-26Degree:MasterType:Thesis
Country:ChinaCandidate:N ChenFull Text:PDF
GTID:2428330599454633Subject:Control Science and Engineering
Abstract/Summary:PDF Full Text Request
Planar switched reluctance motor(PSRM)is a new type of two-dimensional planar direct drive device.It does not have mechanical transmission devices in structure and does not need rare permanent magnets in material.It has advantages of simple structure,low cost,fast response and high reliability,which makes it possesses great development prospects in planar motion devices.The control of the PSRM depends on real-time position information of mover,which can be detected by position sensor.However,the utilization of position sensor not only increases the complexity,cost and space occupancy of the PSRM system,but also reduces the anti-interference ability and reliability of the system.In order to solve the problems mentioned above,the sensorless position estimation and sensorless control of the PSRM will be investigated.The main contents of this paper are as follows:Based on the structure and operating principle of the PSRM and the electromagnetic theory,mathematical models of the PSRM are deduced,and sensorless position open-loop control system and position closed-loop control system of the PSRM are constructed.According to the system structure,the experimental platform based on dSPACE is built and the corresponding control program is designed.Aiming at the mechanical structure of the PSRM and the existence of core loss,the core loss characteristics of the PSRM are analyzed and verified by finite element analysis.In order to further verify the core loss characteristics through experiments,the appropriate injected voltage waveform is selected,and a real-time calculation method of core loss average power(CLAP)is proposed.According to the core loss characteristics and the complexity analyses of the generation and detection of the injected voltage,parameters of the injected voltage are determined,which establishes a theoretical foundation for the follow-up research.Aiming at the problem that the initial relative position of the PSRM needs to be acquired when starting,a sensorless initial relative position estimation method is proposed and relevant experiments are carried out.The experimental results show that the maximum absolute error(MAE)of the initial relative position estimation of x-axis is 0.451 mm and the average absolute error(AAE)is 0.159 mm.The MAE of the initial relative position estimation of y-axis is 0.554 mm and the AAE is 0.177 mm,which verifies the feasibility and validity of the proposed method.To solve the problem of sensorless open-loop position control of the PSRM,a commutation strategy based on the CLAP is designed.This strategy can realize commutation by comparing the CLAP without estimating the exact position.The experimental results show that the method can accurately switch the conduction phase and the injection phase when the two axes of the PSRM move simultaneously,achieving stable open-loop control successfully.To solve the problem of sensorless position closed-loop control of the PSRM,a sensorless long stroke position estimation method is proposed,and a commutation strategy based on relative position is designed.By changing radius and period of a given circular reference trajectory,six position closed-loop control experiments are carried out.The following are the maximum values of each type of errors in six experiments: the MAE and AAE of x-axis position estimation are 1.468 mm and 0.287 mm,respectively;the MAE and AAE of y-axis position estimation are 1.527 mm and 0.385 mm,respectively;the MAE and AAE of x-axis trajectory tracking are 1.485 mm and 0.442 mm,respectively;the MAE and AAE of y-axis trajectory tracking are 1.401 mm and 0.415 mm,respectively.The experimental results verified the feasibility and validity of the proposed method,and the sensorless position closed-loop control of the PSRM was realized successfully.In summary,the proposed sensorless position estimation method based on voltage injection and core loss calculation can realize the sensorless control of the PSRM without using position sensors.
Keywords/Search Tags:Planar Switched Reluctance Motor (PSRM), Sensorless Control, Position Estimation, Voltage Injection, Core Loss
PDF Full Text Request
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