Electrical generator or motor structure – Dynamoelectric – Oscillating
Reexamination Certificate
2011-01-25
2011-01-25
Leung, Quyen (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Oscillating
C310S012010, C310S015000, C310S050000, C015S021200
Reexamination Certificate
active
07876003
ABSTRACT:
The drive system for a personal care appliance, such as a toothbrush, includes a first opposing pair of permanent magnet assemblies positioned longitudinally along the length of the internal surface of a cylindrical appliance housing, each first permanent magnet assembly having one portion with a north polarity and the other portion a south polarity, and a second pair of permanent magnet assemblies which are orthogonal to the first pair of permanent magnet assemblies, one second permanent magnet assembly having a plurality of abutting first parts along the length thereof, the parts alternating between a north polarity and a south polarity, the other second permanent magnet assembly having similar parts with reversed polarity. First and second armatures are mounted on, or a portion thereof forms, a spindle element which extends along the length of and outward from the cylindrical housing. A plurality of drive windings are positioned around the armatures in such a manner that application of current to the windings, under programmable control, produces axial and/or tangential movement of the spindle and the workpiece.
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Dr. Andrzej M. Pawlak: “Magnets in Modern Rotary Actuators”, Industry Applications Conf., 1995 IEEE, 1995, vol. 1, pp. 498-504.
Koninklijke Philips Electronics , N.V.
Leung Quyen
Pham Leda
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