Electric motor with electromagnetic brake
First Claim
1. An electric motor comprising a rotor, an electromagnetic brake means for braking the rotor, and a stator wherein said stator comprises at least one pole pair, in which at least one pole of said pole pair comprises a pole shoe which faces inward towards the rotor and is surrounded by a stator winding, and wherein said at least one role of the stator supports the electromagnetic brake means and wherein the electromagnetic brake means comprises a brake element composed of an electromagnetically conductive material which is urged against a braking force by an attraction force generated by the magnetic flux induced during operation of the motor, wherein said brake element is constructed in the shape of a rocker element and is pivotally supported to pivot about an axis in a radially continuous free space within the stator such that the brake element applies a braking force to the rotor at a position offset from said axis.
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Accused Products
Abstract
An electric motor with an electromagnetic brake is disclosed, particularly for use in an angle grinder, which has a stator having at least one pole pair, in which at least one pole has a pole shoe which points to the inside towards the rotor periphery and is surrounded by a stator winding. The pole accommodates the brake means for braking of the rotor of the electric motor. The brake element can be adjusted against the braking force by the magnetic field of the stator winding when the motor is activated. The brake element is constructed of magnetically conductive material as a rocker which is exposed to the braking force off-center of the swivel axis of the brake element. As a result of the off-center application of force the brake element having a disengagement arm can be arranged in the magnetic flux of the stator winding such that a high disengagement moment can be achieved and rapid braking can occur at shutoff.
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Citations
15 Claims
- 1. An electric motor comprising a rotor, an electromagnetic brake means for braking the rotor, and a stator wherein said stator comprises at least one pole pair, in which at least one pole of said pole pair comprises a pole shoe which faces inward towards the rotor and is surrounded by a stator winding, and wherein said at least one role of the stator supports the electromagnetic brake means and wherein the electromagnetic brake means comprises a brake element composed of an electromagnetically conductive material which is urged against a braking force by an attraction force generated by the magnetic flux induced during operation of the motor, wherein said brake element is constructed in the shape of a rocker element and is pivotally supported to pivot about an axis in a radially continuous free space within the stator such that the brake element applies a braking force to the rotor at a position offset from said axis.
Specification