Modeling Of Losses In Switched Reluctance Machines Based On DC Pluse Method

Switched reluctance motor is a new type of variable speed motor, has a simple structure, low cost, high fault tolerance, etc. It is widely used in traction transportation, general industrial, aircraft industry, household applications and other fields. But the flux waveforms of switched reluctance motor core are extremely complex, resulting in much difficulty in iron loss calculation, so that the majority of switched reluctance motor models neglect iron loss, affecting the accuracy of the switched reluctance motor models.In order to establish a more precise switched reluctance motor model, this thesis mainly studys on the iron loss. Firstly, the flux linkage measurement method is improved. The DC multi-pulse method is used to measure the motor. Thus, the problem that the iron loss of the core can't be fully exposed by DC single pulse method is solved. Secondly, the switched reluctance motor magnetic circuit is analyzed. Aiming at the problem that there is a certain deviation of the pure flux linkage computed by rising-and-falling region flux linkage when the current is zero, a correction factor is added to the pure flux calculation formula and then fitted. The iron loss and the pure flux linkage are successfully solved based on the correctional formula. At last, a 1000W three-phase 12/8 pole switched reluctance motor is selected as the sample motor. And Matlab/Simulink is used to establish a switched reluctance motor model containing iron loss, thereby establishing a switched reluctance motor drive system simulation model containing iron loss.In order to verify the function and the simulation precision of the switched reluctance motor drive system simulation model containing iron loss, a switched reluctance motor drive system testing platform is built. The contrast test between the simulation model and the experimental platform is implemented under different control modes. Experimental results show that the switch reluctance motor drive system simulation model containing iron loss satisfies the design requirement. The relative error of phase current peak is less than 5.00%, the relative error of the efficiency is less than 10.00%, the relative error of torque is less than 5.00%, and the relative error of speed is less than 8.00%.