Patent ID: 6441517
Filing Date: 2002-08-27
Classification: B26B,H02K

Abstract:
A drive mechanism for driving a coupling device (12, 13) in a rotary oscillating manner couplable in driving relation with a working unit (32) of an electric product of personal use, said drive mechanism comprisinga permanent magnet motor (1, 100, 200) having a stator (2) with an exciter winding (3) and a rotor (4, 204) with at least one permanent magnet (11) positioned in a stator field and rotatably mounted on a shaft (8), a reset device (14, 114, 214) for returning the rotor to a position of rest in such a way as to enable the rotor to oscillate about the position of rest, a coupling device (12) for coupling the rotor to the working unit, wherein the coupling device is connected to the rotor in spaced relationship to the rotor shaft, a detecting device (18) for detecting oscillatory motions of the rotor, an actuating unit (29) for actuating the permanent magnet motor in response to the detected oscillatory motion, and a frequency control element (44; 45, 46, 47, 49) for actuating the permanent magnet motor with a frequency corresponding approximately to a resonant frequency of the rotor.