Method and apparatus for operating an electronically commutated electrical machine in the event of a fault

Abstract

The invention relates to a method for operating a multiphase electrical machine (2) in the event of a fault, wherein the electrical machine (2) is driven with the aid of a driver circuit (3), wherein the driver circuit (3) has half-bridge circuits (31), each associated with a phase (U, V, W), and bridge paths (32) for connecting or disconnecting predetermined voltage potentials to / from the respective phases (U, V, W) of the electrical machine (2), wherein one or more of the bridge paths (32) are operated according to a first fault operating mode if a fault is detected, wherein, in the first fault operating mode, the one or more bridge paths (32) are controlled in such a manner that said paths connect a first of the predetermined voltage potentials to the phase (U, V, W) via a predetermined electrical resistor.

Description

technical field

[0001] The invention relates to an electronically commutated electric machine, in particular a multiphase electric machine, which is controlled by means of a drive circuit. The invention also relates to a method for controlling an electric machine in the event of a fault. Background technique

[0002] Electronically commutated electric machines, such as those used in electric drives, are controlled by means of a drive circuit (inverter). For this purpose, the drive circuit has semiconductor switches which are switched in a commutation pattern offset from one another in order to supply current to several phase branches of the electric machine. For example, such a driver circuit for a three-phase electric machine can be implemented as a so-called B6 circuit, which has three half-bridges, which each include two semiconductor switches connected in series. The half bridges are used to generate a phase voltage respectively. A supply voltage is applied to the hal...

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