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AssigneeMitsubishi Electric Corporation
InventorsShunichi Wada, Takayuki Yamamoto, Ryoichi Yonezawa, Masaki Matsushita, Katsuya Ikemoto
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A malfunction detection device for a resolver detects malfunction in a resolver with accuracy and stability even if a value of a square sum is varied between inside and outside of a normal range. When the resolver is in malfunction, a sine signal and a cosine signal are read. It is determined whether a malfunction determination of the resolver is prohibited, or not, from read values of the sine signal and the cosine signal, or square values thereof. When it is determined that the malfunction determination of the resolver is prohibited, the count value is accumulated and incremented every time the test value falls outside a normal range. When the count value arrives at a given value or higher, it is determined that the resolver is in malfunction.
A malfunction detection device which is attached to and detects a malfunction in a resolver that outputs a sine signal representative of sin θ and a cosine signal representative of cos θ according to a rotation angle θ of a rotating body, the malfunction detection device comprising:
Dependencies are inferred from the claim text.