Patent ID: 7834576

Claim:
A system for diagnosing faults in multiple, associated motor-resolver systems including a first resolver, a second resolver, and a motor controller including a first decoder and a second decoder, the system comprising: a first swapping circuit selectively coupling the first resolver to one of the first decoder and the second decoder; a second swapping circuit selectively coupling the second resolver to one of the first decoder and the second decoder, wherein the first and second swapping circuits are configured such that: when the first resolver is coupled to the first decoder, the second resolver is coupled to the second decoder, and when the first resolver is coupled to the second decoder, the second resolver is coupled to the first decoder; and a controller coupled to the first swapping circuit and the second swapping circuit, the controller configured to: provide a first signal to the first swapping circuit to switch from being coupled to the first decoder to being coupled to the second decoder at a first time; and provide a second signal to the second swapping circuit to switch from being coupled to the second decoder to being coupled to the first decoder at a second point in time, the second time being approximately equal to the first time.