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Abstract-This paper presents a new method of estimating the speed of an induction motor. This method is based on adaptive control theory; Experimental results of a direct field-oriented induction motor control without speed sensors are presented.

This paper describes a variable magnetomotive-force memory motor with a fractional-slot concentrated winding. We propose a method for optimal control of magnetization suitable for a fractional-slot concentrated winding. Our result shows that variable magnetized magnets are more highly magnetized when a fractional-slot concentrated winding is used than those using the conventional method.Index Terms-Current control, concentrated winding, fractional slot, magnetization, permanent-magnet synchronous motor (PMSM), variable magnetomotive-force memory motor.

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