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This paper presents a simple algorithm for estimation of the rotor position. The injected high frequency voltage is a sinusoidal

voltage and is injected into the stator of a motor. An interior permanent magnet synchronous motor (IPMSM) has spatial saliency

because d-axis inductance and q-axis inductance are different from each other. The injected high frequency voltage is influenced by

saliency. Therefore, the rotor position is included in the stator current of the motor. The rotor position is estimated using filters but

the estimated rotor position has error due to the time delay. Therefore, the proposed method decreases the number of filters and

uses different synchronous reference frame transformation (SFT) to extract the rotor position error between the estimated value and

actual value. The simulation results present the effectiveness of the proposed method by showing waveforms of the rotor speed and ​

position with load conditions.