The invention discloses a motor position detecting circuit utilizing an isolating type rotating
transformer, and the motor position detection comprises a decoding
chip, a Buffer circuit and a differential
signal regulating circuit, wherein the output end of the decoding
chip is connected with the input end of the Buffer circuit; the output end of the Buffer circuit is connected with the input end of the rotating
transformer; the rotating
transformer outputs a sine-cosine differential
signal to the differential
signal regulating circuit; the sine-cosine differential signal processed by the differential signal regulating circuit is input to the decoding
chip; and the Buffer circuit comprises a front end filtering circuit, an operating and amplifying
control circuit, a push-pull circuit and a drive protecting circuit. The power amplification of an
excitation signal is realized by adopting the Buffer circuit which is powered by a power supply and has protection, thus the isolating type rotating transformer-adopted motor position detecting circuit can adapt to the drive capability of different loads, can realize a large-range change of differential
voltage peaks and has the advantages of enhanced circuit stability, strong load adaptability and good
interference resistance; and the differential signal regulating circuit with
direct current bias can realize level matching between different rotating transformers and different decoding chips, so that the isolating type rotating transformer-adopted motor position detecting circuit has the advantages of
simple circuit structure, low cost and wide application range.