Comparative evaluation on switched reluctance motor drive with different phase current sensing methods

Abstract

Cost-effective phase current sensing is critical for the performance improvement of switched reluctance motor drive (SRD). In this study, a new two-sensor phase current sensing method is proposed and comparatively investigated with conventional m-sensor and one-sensor methods. First, the operation principles of the m-sensor, one-sensor, and proposed twosensor methods are illustrated in detail on a four-phase SRD. Compared with the one-sensor method, the topology can be maintained without splitting the lower bus into freewheeling bus and excitation bus under the two-sensor method. Next, an advanced decoupling strategy is presented to obtain the complete phase current information and shorten the region of switch signals injection. With the simulation model in Matlab/Simulink environment, the steady and transient performance of SRD in the proposed method are not inferior to m-sensor and one-sensor methods. Meanwhile, the proposed two-sensor method is demonstrated to own superior thermal stress distribution by the finite-element model in ANSYS software. Eventually, the dynamic reliability is proved to be not enhanced as the number of current sensors decreases. Finally, an experimental setup with double-core TMS320F28377D is built to validate the proposed method and evaluation results.

A Systematic Approach to Digital Control Development for Four-Phase SRM Drive Using Single Current Sensor for Medium Power Applications

“…The transfer functions in (20) and ( 21) are discretized using bilinear transformation at a sampling frequency of 20 µs.…”

“…However, this results in increased torque ripple. In [20], the authors have proposed an innovative SRM drive with single and dual current sensors for the conventional AHB converter, addressing torque ripple. However, this work lacks detailed control development, and a systematic control design is missing.…”

Torque-Enhanced Phase Current Detection Schemes for Multiphase Switched Reluctance Motors with Reduced Sensors

“…This scheme can enhance the fault detection ability, but the issue of voltage penalty still exists. In [22], the positions of the power switches in the AHBC are rearranged and two sensors are used to detect the currents through the middle points of the upper and lower dc buses, respectively. This method owns superior thermal stress distribution but still requires pulse injection.…”