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Title:
ELECTRODYNAMIC BRAKING DEVICE FOR A UNIVERSAL MOTOR
Document Type and Number:
WIPO Patent Application WO/2010/105903
Kind Code:
A3
Abstract:
The invention relates to an electrodynamic braking device and to a method for braking a universal motor having a field winding and an armature. The universal motor can be switched from a motor mode to a braking mode. In the motor mode, the armature and the field winding are supplied with an alternating current of a power grid. In the braking mode, the armature is short-circuited and the field winding continues to be supplied with an alternating current from the power grid. In a first phase of the braking mode, the field winding can be supplied with an alternating current having the frequency of the power grid. In a further phase of the braking mode, the field winding is supplied by the power grid with an alternating current having a frequency that is reduced with respect to the frequency of the power grid.

Inventors:
ROTTMERHUSEN, Hermann (Grashofweg 34, Tellingstedt, 25782, DE)
Application Number:
EP2010/052624
Publication Date:
February 03, 2011
Filing Date:
March 02, 2010
Export Citation:
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Assignee:
ROBERT BOSCH GMBH (Postfach 30 02 20, Stuttgart, 70442, DE)
ROTTMERHUSEN, Hermann (Grashofweg 34, Tellingstedt, 25782, DE)
International Classes:
H02P3/10
Foreign References:
US6236173B12001-05-22
EP1385261A22004-01-28
EP1044921A22000-10-18
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