Redundant sensor device and method of determining abnormality of redundant sensor device

A redundant sensor device, comprising:

• a first rotation sensor for detecting a rotation angle in physical characteristics of an output shaft of a motor and for outputting a first output signal and a second output signal corresponding to said rotation angle detected, wherein
• said first output signal and said second output signal have the same characteristics in phase relationship,
• a second rotation sensor for detecting a rotation angle in the physical characteristics of the output shaft of the motor, and for having one of the following three characteristics:
• a characteristic that is the same as either the first output signal or the second output signal output by the first rotation sensor having the equivalent characteristic in phase relationship corresponding to an detected rotation angle, a characteristic that differs in phase by a predetermined phase, and a characteristic that the third output signal is offset in the third output signal,
• a plurality of electronic control devices, each having an abnormality determiner for determining a presence or absence of abnormality of input signals, each using a control circuit for outputting a control signal obtained by calculating electric power supplied into the motor in accordance with the input signals, for controlling said motor, wherein
• said abnormality determiner is configured to determine a presence or absence of abnormality by the voltage value of three different output signal ports based on the first output signal and a second output signal output from the first torque sensor, and the third output signal output from a second torque sensor, and an output signal of the first torque sensor or an output signal of the second torque sensor determined being normal is used as the control signal.