| 摘要 |
PURPOSE:To improve absolute accuracy of rotating angle position detection at reduced temperature drift, by connecting in series electric resistances between the secondary winding of resolver and one side of a signal wire. CONSTITUTION:A detecting unit 118 is composed of filter, wave-forming circuit, etc. Further, in a signal processing unit 119, a signal V0' is received as a feedback signal corresponding to an operation condition of a rotation-available unit 112 and a controlling signal, etc. for the unit 112 is formed. In this case, a phase characteristic of output voltage does not depend on the secondary winding resistance, but on a compensating resistance RS. In the conventional method, in case when the resistance RS is not existing, a phase fluctuation by the resolver temperature was 3.0 deg. covering 0 deg.C-100 deg.C, however, this value was improved to 1.0 deg. in this case. Further, as it is assured that a phase drift is of approximately 0.8 deg. on the exciting winding side, the rate of improvement on the secondary winding side is from 2.2 deg. to 0.2 deg., resulting to a significant improvement of the phase characteristic.
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