Method for Detecting Abnormality of Resolver, Angle Detection Device, Motor, and Transportation Device

Abstract

There are provided a method for detecting an abnormality of a resolver, an angle detection device, a motor, and a transportation device, by which the abnormality can be detected promptly without the necessity of any complicated operations. There is provided a circuit configured to switch between a sine wave and a direct current voltage to be supplied, as an excitation signal of a resolver ( 2 ). Then, immediately after the power is turned on, the direct current voltage is applied to the resolver ( 2 ), and the output voltages of the phases of the resolver ( 2 ) are measured when the direct current voltage is applied. In this situation, the output voltages of the phases are compared with each other. When none of them matches each other, it is determined that an abnormality (short-circuit abnormality, short-circuiting) occurs at the resolver ( 2 ).

1 - 6 . (canceled) 
     
     
         7 . An angle detection device, comprising:
 a resolver configured to output rotating positional information of a rotating body, as an electrical signal;   a sine wave generator configured to generate a sine wave signal;   a direct current voltage generator configured to generate a direct current voltage;   an excitation signal supplier configured to select one of the sine wave signal generated by the sine wave generator or the direct current voltage generated by the direct current voltage generator, and to supply the selected one to the resolver as an excitation signal;   a voltage measurement portion configured to measure output voltages of phases of the resolver; and   an abnormality detector configured to detect an abnormality of the resolver, by comparing the output voltages of the phases of the resolver measured by the voltage measurement portion, when the excitation signal supplier supplies the direct current voltage generated by the direct current voltage generator, as the excitation signal.   
     
     
         8 . The angle detection device according to  claim 7 , wherein the excitation signal supplier is configured to select the direct current voltage generated by the direct current voltage generator and to supply the direct current voltage to the resolver, as the excitation signal, immediately after power is turned on. 
     
     
         9 . A motor comprising the angle detection device according to  claim 7 . 
     
     
         10 . A transportation device configured to transport a transportation target by using the motor according to  claim 9 .