Drive unit for generating an oscillatory motion for electrical small-scale units

A drive unit, oscillating motion technology, applied in the direction of electrical components, electromechanical devices, etc., can solve the problem of strong vibration of the motor shell and toothbrush, etc.
CN1875537AActive Publication Date: 2006-12-06BRAUN AG
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BRAUN AG
Publication Date
2006-12-06

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Abstract

The invention relates to a drive unit (1) for generating an oscillatory motion for an electrical small-scale unit. The inventive drive unit (1) comprises a stator (2) containing at least one coil (5) and a first and second magnet arrangement (6) each having at least one permanent magnet (7). This drive unit (1) also comprises an armature (3) with a non-rotational symmetric design having a first and a second radial projection (10), which extend only over a partial area of the periphery of the armature (3) and are made of a magnetizable material. The inventive drive unit (1) is characterized in that by positioning the magnet arrangements (6) relative to the radial projections (10) of the armature (3), assignments between the magnet arrangements (6) and the radial projections (10) are formed in pairs in such a manner that the magnetic interaction between the magnet arrangement (6) and the radial projection (10) of one pair is permanently greater than the magnetic interaction between the magnet arrangement (6) and the radial projection (10) of two different pairs.
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Description

technical field

[0001] The invention relates to a drive unit for generating an oscillating motion for a small electrical appliance. Furthermore, the invention relates to a small electrical appliance with such a drive unit. Background technique

[0002] Electric drive units for generating an oscillating movement are used, for example, in electric toothbrushes or electric shavers. For example from US 5,263,218 an electric toothbrush is known in particular with a pivotable lever arm, wherein the pivotable lever arm is arranged to oscillate by means of a fixed electromagnet and a fixed permanent magnet, on which the brush is arranged . The lever arm is therefore formed in a region adjacent to the electromagnet from a ferromagnetic material which partially surrounds the permanent magnet. The ferromagnetic material is used to couple the magnetic flux generated by the permanent magnet to the electromagnet and thus drive the lever arm.

[0003] An oscillating tool, in particular...

Claims

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