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A Novel Initial Rotor Position Estimation Strategy for Doubly Salient Electromagnetic Machine with Two Test Pulses Injetcion

The varying feature of self-inductance is an effective approach for estimating the rotor position of doubly salient electromagnetic machine (DSEM). In face of the problem of startup duration increase and startup performance degrade that comes from the required multiple test pulses injection, this paper proposes a novel initial rotor position estimation scheme with two test pulses injection, which is based on the corresponding relation between the minimal phase self-inductance and rotor sector. Wherein the minimal phase self-inductance is searched by two comparison steps of two phase self-inductances, which are carried out by the magnitude relation comparison of two parallel connected phases when the all three phases injected test pulse ends. In addition, the selection rule of test pulse width is studied by overall considering the estimation accuracy for rotor position and the startup performance. Finally, the experiments on a 12/8-pole DSEM verify the correctness and feasibility of the proposed strategies.