The Bergquist Torrington' Company

The Berquist Torrington Company

Bumsuk Won

Russel Hugh Marvin

Gary Peresada

Haroon I Yunus

A method and circuit for detecting the position of the movable element of an electrically commutated machine. The method and apparatus allow detection of the back electromagnetic force (BEMF) waveform with all legs of the machine energized by mathematically removing the applied voltage from the measured voltage across the phases.

Method and apparatus for movable element position detection in an electrically commutated machine

A method for making a rotor for a permanent magnet electric motor comprising the steps of providing an annular permanent magnet and an annular back-up member. Affixing the magnet to the inner surface of the back-up member in an un-magnetized condition and overmolding both in an injection molding process while controlling the flow of the molten plastic so as to cause the plastic to engage the opposite sides of the magnet at substantially the same time resulting in a knit line intermediate the magnet sides on the inner surface of the magnet. Magnetizing the magnet.

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Avon, CT, United States of America

Bumsuk Won