Patent · US Active

Method for operating an electric motor and corresponding electric motor device

US9590544B2 · kind B2 · utility

0Cited by

2References

21Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Andreas Schmidtlein · Tamm, DE
Gotthilf Koerner · Rutesheim, DE
Marco Ferwagner · Ubstadt-Weiher, DE
Christoph Emde · Frebershausen, DE

Key dates

Filing date	Sep 27, 2013
Grant date	Mar 7, 2017
Priority date	—
Expiry date	Sep 27, 2033

Classification

Technology area (CPC H)Electricity
CPC primaryH02P7/291
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method for operating an electric motor connectable via a switching device to a current source and connected in parallel with a freewheeling device, the switching device having control applied to it at a specific activation ratio within each working cycle to establish a desired effective operating voltage of the electric motor, so that in at least one operating mode each working cycle is includes an activation and a freewheeling time period. The freewheeling device has a freewheeling transistor and a freewheeling diode, connected in parallel with the transistor and reverse-biased as to the current source; and control is applied to the freewheeling transistor in the freewheeling time period as follows: identifying the freewheeling voltage dropping across the electric motor; and switching the freewheeling transistor for a specific switching time period if the freewheeling voltage is different from zero, particularly less than zero. Also described is an electric motor device.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.