Control device and method for determining the rotor angle of a synchronous machine

摘要

Determining the rotor angle of a synchronous machine. In one aspect, the invention provides a method that includes generating a multiplicity of pulse-width-modulated drive signals for the phases of an inverter feeding the synchronous machine depending on a voltage to be fed into the synchronous machine, and applying a first phase shift to one or more of the multiplicity of pulse-width-modulated drive signals, so that the duration of the switching states of the inverter is extended in order to generate a first switching pattern for the phases of the inverter. The method also includes applying a second phase shift to one or more of the multiplicity of pulse-width-modulated drive signals for generating a second switching pattern, selecting one or more of the first and second switching patterns, determining one or more of neutral point potentials at the neutral point of the synchronous machine, and calculating the rotor angle of the synchronous machine.

主权项

1. A method for determining the rotor angle of a synchronous machine, the method comprising:
generating a multiplicity of pulse-width-modulated drive signals for the phases of an inverter feeding the synchronous machine depending on a voltage to be fed into the synchronous machine; applying a first phase shift to one or more of the multiplicity of pulse-width-modulated drive signals, with the result that the duration of the switching states of the inverter in which an active voltage phasor is output is extended in order to generate a first switching pattern for the phases of the inverter; applying a second phase shift to one or more of the multiplicity of pulse-width-modulated drive signals for generating a second switching pattern for the phases of the inverter; selecting one or more of the first and second switching patterns for driving the inverter; determining one or more of neutral point potentials at the neutral point of the synchronous machine during driving of the inverter with the selected switching patterns; and calculating the rotor angle of the synchronous machine depending on the determined neutral point potentials.