192 clutches and power-stop control – Clutches – Operators
Patent
1994-06-10
1996-03-12
Lorence, Richard M.
192 clutches and power-stop control
Clutches
Operators
192 84R, 192 82T, 361 93, 361103, 361152, F16D 4800, H01F 718
Patent
active
054978700
ABSTRACT:
Rotation slip between the rotor and the armature of an electromagnetic clutch results in the exciting current I in the electromagnetic coil decreasing locally abruptly to form a unique waveform. The locally abruptly rising variations in the current is taken out as a locally abruptly variation (an alternating current component) in an inverted and amplified voltage, and the alternating current component is applied to a comparing circuit (400). The instantaneous value of the alternating current component is compared with a threshold which rises as the rotational speed of the rotor becomes higher, and while the instantaneous value exceeds the threshold, a comparison output is outputted. The comparison output is applied to a continuous waveform confirming circuit (500), and if the predetermined number of comparison outputs are detected with a predetermined time after a first comparison output has been generated, it is determined that a rotation slip has occurred. If the predetermined number of comparison outputs are not detected within the predetermined time a comparison output which is next generated is set as a first comparison output and the rotation slip decision operation is repeated.
REFERENCES:
patent: 3917041 (1975-11-01), Walberg
patent: 4509091 (1985-04-01), Booth
patent: 4567975 (1986-02-01), Roll
patent: 4620261 (1986-10-01), Thornton
patent: 4949828 (1990-08-01), Olsen
patent: 5179496 (1993-01-01), Mimura
patent: 5295038 (1994-03-01), Matsushita et al.
patent: 5375031 (1994-12-01), Mimura
Lorence Richard M.
Ogura Clutch Co. Ltd.
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