Electricity: measuring and testing – Magnetic – Displacement
Patent
1981-10-14
1986-09-16
Karlsen, Ernest F.
Electricity: measuring and testing
Magnetic
Displacement
324162, 34087025, G01B 714, G01P 342, G08C 1916
Patent
active
046125035
ABSTRACT:
A detection head unit comprises a stator and a rotor. The stator has four poles disposed circumferentially at an interval of 90.degree.. The poles have primary coils and secondary coils wound thereon. Two radially opposing poles constitute a pole pair. The primary coils wound on the poles constituting the pole pair are connected in series and in opposite phase with each other and one pole pair is excited by a sine wave signal and the other pole pair by a cosine wave signal. The rotor is of such a configuration, e.g. an eccentric rotor, as to change reluctance of the respective stator poles in accordance with a rotation angle and change reluctance in a differential manner between the two poles constituting the pole pair. An output signal resulting by phase shifting the sine wave signal applied to the primary coil in accordance with a rotation angle of the rotor is provided by a secondary coil. The rotation angle is detected by measuring phase difference between the reference signal and the output signal of the secondary coil. The rotation speed can be detected by detecting difference in frequency or period between the reference signal and the output signal. Further, acceleration in rotation can be detected by detecting an amount of change in the rotation speed. The detection device of a high resolution can be obtained by providing teeth of a certain pitch on the periphery of the rotor and teeth corresponding to the rotor teeth on the stator poles.
REFERENCES:
patent: 3079548 (1963-02-01), Robinson
patent: 3281655 (1966-10-01), Blasingame
patent: 3858109 (1974-12-01), Liden
Shimizu Wataru
Yamashita Akira
Kabushiki Kaisha S G
Karlsen Ernest F.
Snow Walter E.
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