DEVICE FOR PRODUCING A ROTATIONAL POSITION SIGNAL AND A METHOD FOR PRODUCING ROTATIONAL POSITION SIGNALS

摘要

A device (101) for producing a position signal indicative of rotational position of a resolver is presented. The device comprises a signal transfer interface (102) for receiving first and second alternative signals, and a processing system (103) for generating the position signal on the basis of the amplitudes of the first and second alternative signals and the polarity of an excitation signal of the resolver. The device is configurable to operate in a first operational mode where a local signal generator (104) generates the excitation signal and the device transmits the excitation signal to the resolver. The device is configurable to operate also in a second operational mode where the device receives information indicative of the polarity of the excitation signal from another device. Thus, devices of the kind described above can be used in a system where many converters are driving separate windings systems of an electrical machine.

主权项

1. A device for producing a position signal indicative of rotational position of a resolver, the device comprising:
a signal transfer interface for receiving a first alternative signal and a second alternative signal, amplitudes of the first and second alternative signals being dependent on the rotational position of the resolver so that envelopes of the first and second alternative signals have a mutual phase shift, a processing system for generating the position signal at least partly on the basis of the amplitudes of the first and second alternative signals and a polarity of an excitation signal of the resolver, and a signal generator,wherein:
the device is configurable to operate in a first operational mode where the signal generator is configured to generate the excitation signal and the signal transfer interface is configured to transmit the excitation signal to the resolver and to transmit information indicative of the polarity of the excitation signal to one or more other devices, and the device is configurable to operate in a second operational mode where the signal transfer interface is configured to receive the information indicative of the polarity of the excitation signal from one of the other devices and where the received information indicative of the polarity of the excitation signal is independent of operation of the signal generator.