Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1991-05-09
1995-10-03
Martin, David S.
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
318661, 341116, G05B 1931
Patent
active
054554985
ABSTRACT:
An angle of rotation detector has a drive unit which supplies 90 degree phase shifted signals to a pair of stator coils and measures an analog output from a rotor coil in a resolver. A calculating device calculates the rotational angle of the resolver using the output of an analog to digital converter receiving the analog output of the rotor. In one embodiment, the calculating device performs a Fourier transform to compute the phase of a fixed frequency component contained in the output of the rotor coil. In another embodiment, the drive unit supplies signals wherein f(T/2+t)=-f(t) and the calculating device performs a Fourier transform using data from successive half periods of the drive waveform. In another embodiment, the output of the rotor is sampled at 1/4 period of an excitation signal from the drive unit and the calculating device determines the phase difference between the excitation signal and the rotor output. In still another embodiment, the calculating device compares the outputs at two or more points having a fixed time relationship and compares the results to stored reference data to arrive at the angle of rotation.
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Fujisaki Akiyoshi
Kakimoto Tatsumi
Kubo Takeshi
Nishina Teruya
Takahashi Kuniyoshi
Martin David S.
Omron Corporation
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