Kollmorgen Technologies Corporation

Thomas R England

Roy D Schultz

C Clark Altizor

A rotary electric dynamo machine in which the ripple component in the output occurs at a higher frequency. One half of the pole faces have a nonuniform airgap while the other half have a uniform air gap and cover a noninteger slot distance. The armature has an odd number of slots. Instead of the usual ripple component at the slot frequency, a dynamo constructed as described above, surprisingly, has a predominant ripple component at twice the slot frequency.

Dynamo electric machine with upwardly shifted ripple frequency

A method of making an electric motor with the stator winding inside a slotless cylindrical stator shell.

Method of making a servo motor with high energy product magnets

A brushless DC tachometer including an alternator which produces a substantially trapezoidal output signal coupled to an FET transistor switching bridge. The trapezoidal output signal is achieved using a block permanent magnet for one pole and a consequent pole contoured to achieve a substantially uniform flux density for the winding over a distance sufficient to produce a trapezoidal output signal.

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Blacksburg, VA, United States of America

Thomas R England