Patent ID: 9714845
Date: 2017-07-25
CPC Classifications: G01D,G01R

Claim:
1. A resolver abnormality detection apparatus for a resolver having a first secondary winding and a second secondary winding which constitute different phases, comprising: a first resistor section including a first pull-up resistor for pulling up the first secondary winding, a first pull-down resistor for pulling down the first secondary winding and a first DC power supply connected to the first pull-up resistor; a second resistor section including a second pull-up resistor for pulling up the second secondary winding, a second pull-down resistor for pulling down the second secondary winding and a second DC power supply connected to the second pull-up resistor; a first differential input section connected across the first secondary winding; and a second differential input section connected across the second secondary winding; the resolver abnormality detection apparatus detecting presence of an abnormality in each of the first and second secondary windings based on outputs of the first and second differential input sections, a first voltage as a DC voltage between the first resistor section and the first differential input section and a second voltage as a DC voltage between the second resistor section and the second differential input section.