Patent · US Active

Method for braking an electric drive motor

US9306478B2 · kind B2 · utility

4Cited by

5References

18Claims

0Family size

Assignee

Andreas Stihl AG & Co. KG · DE

Inventors

Claudius Kischka · Backnang, DE
Simon Trinkle · Kaisersbach, DE
Andreas Neubauer · Ludwigsburg, DE
Gernot Liebhard · Waiblingen, DE
Rene Wichert · Durlangen, DE

Key dates

Filing date	Sep 23, 2014
Grant date	Apr 5, 2016
Priority date	—
Expiry date	Sep 23, 2034

Classification

Technology area (CPC H)Electricity
CPC primaryH02P3/18
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The invention is directed to a method for braking an electric drive motor having a stator and a rotor. The stator has field coils which have electrical phase connections for three motor phases. To generate an electromagnetic rotating field driving the rotor, the phase connections are connected to a supply voltage via switches actuated by a control unit which closes the switches depending on the rotary position of the rotor. To brake a rotating rotor, a braking current is generated by short-circuiting the phase connections. A phase short circuit is switched in between each two phase connections of the field coils with a preset temporal sequence to brake the rotor. The phase connections short-circuited are each selected corresponding to the rotary position of the rotor so that that field coil is short circuited in which the voltage induced by the magnetic field of the rotating rotor passes through its maximum.

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