System for Measuring the Position of an Electric Motor

eliminates tach rollers eliminates encoders
No tach rollers No code wheels
No encoders
High resolution electronic sensor of angular motor position
High reliability - no mechanical or optical components
Low cost, reliable method for precise speed control, precise position control, and motor commutation
Works at any speed, even while motor is stopped
Eliminates need for optical encoders, tach rollers, Hall sensors, and sensor cables
Can be used with most DC motors
Eases packaging - no requirement to place components close to motor
No injection of extraneous test signals

Patent 6703805

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