The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 24, 2013
Filed:
Mar. 02, 2010
Hans Hermann Rottmerhusen, Tellingstedt, DE;
Hans Hermann Rottmerhusen, Tellingstedt, DE;
Robert Bosch GmbH, Stuttgart, DE;
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.