Abstract
This paper presents a position sensorless drive of a brushless dc motor with a sinusoidal flux distribution. The estimation of position and emf is performed by using the integration of the current differences between the actual motor and model. The estimation speed is calculated by the differential calculus of the estimated position. The stability of the proposed algorithm and the design of the estimation gains are explained and it is shown that the parameter differences do not give serious effects on the estimation characteristics.In the experimental results using a 6-pole 1.2kW test motor, the speed control range from 35 to 1500rpm is obtained. To verify the proposed algorithm, the estimation and speed control characteristics are shown. Furthermore, the starting characteristics of the motor from arbitrary rotor position are shown.
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