Novel position estimation for switched reluctance motor based on space vector of phase inductance

In this paper, an estimation method of rotor position for 3-phase SRM based on the space vector of inductance at standstill and during rotating condition is described. The rotor position at standstill is obtained simply without magnetic characteristics of the motor and additional hardware. Assuming the inductance waveform to be sine wave, the rotor position at standstill is obtained by computing the angle of space vector of inductance. At low speeds, the rotor position estimation is carried out by applying DC bus voltage to the idle phases over a short time. At high speeds, the inductance of the excited phase is used to estimate the rotor position. The validity of the proposed method is verified by experimental results.