Title:
METHOD FOR OPERATING AN ELECTRIC MOTOR AND CORRESPONDING ELECTRIC MOTOR DEVICE
Document Type and Number:
WIPO Patent Application WO/2014/082772
Kind Code:
A3
Abstract:
The invention relates to a method for operating an electric motor (2), which can be connected to a power source (5) by means of a switching device (3) and is connected in parallel to a freewheel device (9), wherein the switching device (3) is triggered with a defined duty ratio to set a required effective operating voltage of the electric motor (2) inside each working cycle, such that each working cycle in at least one operating mode is composed of an on-time period and a freewheel-time period. The invention provides that the freewheel device (9) has a freewheel transistor (10) and a freewheel diode (11) connected thereto in parallel and arranged in the blocking direction to the power source (5) and that the freewheel transistor (10) is triggered in the freewheel-time period with the following steps: determining the freewheel voltage dropping across the electric motor (2); and switching the freewheel transistor (10) for a defined switching period if the freewheel voltage is not zero, particularly less than zero. The invention further relates to an electric motor device (1).
Inventors:
EMDE CHRISTOPH (DE)
FERWAGNER MARCO (DE)
KOERNER GOTTHILF (DE)
SCHMIDTLEIN ANDREAS (DE)
FERWAGNER MARCO (DE)
KOERNER GOTTHILF (DE)
SCHMIDTLEIN ANDREAS (DE)
Application Number:
PCT/EP2013/070212
Publication Date:
October 02, 2014
Filing Date:
September 27, 2013
Export Citation:
Assignee:
BOSCH GMBH ROBERT (DE)
International Classes:
H02P7/29
Foreign References:
| DE102007019408B3 | 2008-11-27 | |||
| DE102007060949A1 | 2009-06-25 |
Attorney, Agent or Firm:
ROBERT BOSCH GMBH (Stuttgart, DE)
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