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With regard to the electromagnetic interference and power loss generated in the operation of the switches in switched reluctance motor drive ( SRD ) system, the paper proposed a converter with a new kind of capacitor divider parallel resonant DC link( CDPRDCL). The converter was to realize the zero-voltage-turn-off of the phase switches by connecting one buffer capacitor to each switch in conventional asymmetric inverters; and to realize the zero-voltage-turn-on of the phase switches, and the soft operation of the resonant switches, by adding a resonant link containing, as the main components, two inductors and one capacitor and through reasonably controlling the resonant switches in this link. The required condition for soft-switching was obtained by analyzing the working principle and operation process of the circuit. The soft-switching converter with such a resonant link has a larger effective interval and a lower power loss,thereby enhancing the efficiency and performances of SRD. Finally,the validity and efficiency of the converter are verified by MATLAB simulation. [ABSTRACT FROM AUTHOR]

The hardware and control models of the Switched Reluctance Motors Drive (SRD) were developed to realize the digitization and improve the reliability of the shearer, and to solve the problem of the shearer without reversal run. The control system and the experiment platform for no-position sensor of shearer SRD were manufactured, too. And the tests were done for the position precision detection of the rotor, the load characteristic and the prototype measuring. The experiment results indicate that the error between the estimated position and real position of the rotor is smaller in the designed no-position sensor control system, there is no reversal run of the system according the designed shearer control system with no-position sensor; the two-phase current of stator A and B are impelled at the same time, which indicates the detection precision of the rotor is higher; the acceleration and deceleration tests of the SRM are done in the loading experiment, the phase switch of the parameters(current, flux-linkage, rotor impulse, rotor angle) are better, and the torque of the SRM is controlled accurately by the system, which indicates the control performance of the system is better; and the right and left SRM are controlled correctly by the system in the prototype measuring, which indicates that the no-position sensor control system is feasible and reliable. [ABSTRACT FROM AUTHOR]

Based on the magnetic method combining the Maxwell tensor in considering magnetic saturation method, magnetic saturation effect and actual switched reluctance motor stator and rotor under the premise of big width, an analytical model of radial force which can directly apply to switched reluctance motor stator and rotor was set up with extremely unequal and equal arc to two circumstances analytical models of radial force. This model conforms to the actual switched reluctance motor structure and operation characteristics and structure optimization design, electromagnetic vibration and noise prediction and control provides theory basis of switched reluctance motor. With a prototype as an example, results show that the analytical model of the 3D finite element analysis of the results compared to verify the correctness of the analytical model. [ABSTRACT FROM AUTHOR]