Patent ID: 7863850

Claim:
An apparatus for providing simulation signals to a motor controller of a type that receives a first sine wave signal, a second sine wave signal, a first cosine wave signal, and a second cosine wave signal, and generates a positive excitation signal and a negative excitation signal, the apparatus comprising: an adjustable sine waveform generator for simulating the first sine wave signal and the second sine wave signal, and including first and second inputs; an adjustable cosine waveform generator for simulating the first cosine wave signal and the second cosine wave signal, and including third and fourth inputs; an adjustable waveform generator including a first output coupled to the first input and to the third input; and an adjustable gain circuit configured to receive the positive excitation signal and the negative excitation signal, and including a second output coupled to the second input and to the fourth input, wherein the gain circuit is configured to vary a voltage of the second output to produce a peak-to-peak voltage amplitude, and wherein the gain circuit is configured to, at least one of simulate a degraded signal fault condition when the peak-to-peak voltage amplitude is greater than a first pre-determined threshold voltage, or simulate a loss of signal fault condition when the peak-to-peak voltage amplitude less than a second pre-determined threshold voltage.