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ABSTRACT
A method for determining the magnetic field shape influence upon the average values and ripple content in induced voltage, current and the electromagnetic torque of a dc micromotor is presented. The dc micromotor with three slots and six different field shapes is analyzed and described analytically. The analysis shows that by using a shape function X(θ) one can find the best motor performance, i.e., highest average values of torque and the lowest ripple component. Using this approach a rectangular magnetic field shape provides the optimum solution for a wide range of tolerances. With this waveform the motor has no ripple on the induced voltage and as a result the torque pulsation are eliminated.