Research On Distributed Winding Based Switched Reluctance Motor

Most of oil fields are the low-energy and low-yielding fields with low permeability in China, so oil has to be pumped by using artificial lift methods. Submersible pump,a kind of artificial lift method, is widely used in the oil field.Now the submersible pump motor mainly includes asynchronous motor and permanent magnet sychronous motor.For the the former, torque performance is poor at low speed, while the later has characteristics of high temperature demagnetization due to the magnet.Switched reluctance motor (SRM) drive system, which is an advanced mechatronic devices, has high start torque and reliability without magnet.It is suitable for application of submersible pump motor. As for conventional three-phase SRM speed control system, six cables are required connecting the power converter with the ends of the windings of motor, which leads to higher costs and is not suitable for the application in submersible pump motor.A novel distributed winding SRM is proposed in the dissertation.There are only three cables connecting the inverter and winding of motor, which largely saves the cost of drive system. The basic structure, operating principles, mathematical modeling, and control strategies on the distributed winding SRM in the dissertation are studied in detail. And the prototype motor is constructed and is used in testifying conrectness of simulation.The research contents and achievements in the dissertation mainly show as follows:1. The distributed winding SRM is proposed. The dissertation develops the basic operation principle of the novel SRM and presents control strategy under the driven by stardard bridge inverter.2. The magnetic field distribution,flux density,self-inductance,mutul-inductance and magnetic torque are calculated by using a FE model.Further,the results compare with convention SRM.3. Magnetic equivalent circuit model is proposed in the dissertation. Linear and non-linear mathematics static model is derived.The former is used in quickly calculating the electromagnetic characteristics of DSRM. The later aims to calculate the accurate electromagnetic characteristics. Besides, simulation results of non-linear model are compared with the results of FE model,which verifys the high accuracy of proposing non-linear mathematic model of DSRM. 4. As for the novel SRM, this dissertation provides the dynamic simulation model using the state space method.Also building the field-circuit coupling analysis models of the novel SRM aims to testify state space model.Besides,the output torque and torque ripple characteristics of the new type SRM and conventional SRM are compared.The building dynamic model used in dynamic simulation saves more time than mangnetic circuit co-simulation.5. The dissertation proposes a novel rotor position detecting device base on conventional photoelectric encode, constructs novel experimental prototype SRM, and builds the drive system with DSP TMS320F2812.6. Static characteristics of the novel SRM is measured at the test bench. The current chopping control and angular position control are implemented. The results verifies the correctness and availability of the basic principles, control strategy and dynamic mathematical model, whcih provides the theoretical and experimental foundation for the actual application of the novel SRM.