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US 2001/0054855 A1Published application
Electric motor
OwnerKarl Echtler, Andreas Degmayrinventors
Life of this patent
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Abstract
An electric motor having a commutator and alternating rotating direction, preferably serving as a drive for hand-operated electric tools, having a groove in an axis of symmetry of the stator to prevent the armature cross field and to increase the life of the brushes, wherein the commutator is advantageously arranged symmetric thereto.
Claims10
An electric motor with a commutator comprising a rotor that rotates about an axis of rotation A and that is constructed as an armature and is provided with a current-carrying armature winding;
- and a stator that surrounds the winding in the form of a casing, for generating an exciting field as part of a magnetic field, wherein the stator forms an at least partially continuous groove in an axis of symmetry of the exciting field, and wherein the groove has at least one of a lower permeability and a lower saturation than the stator.
The electric motor of claim, wherein the commutator is arranged at right angles to the axis of symmetry.
Dependencies are inferred from the claim text.