192 clutches and power-stop control – Clutches – Operators
Patent
1988-10-21
1990-08-21
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
192 84C, 361 31, F16D 2702
Patent
active
049498282
ABSTRACT:
A soft start electromagnetic coupling has a driven member and a driving member that are coupled together in response to a magnetic flux produced by a direct current flow through a winding on the clutch. When the members are coupled by an electromagnetic flux, they may slip relative to reach other during starting, when the load on the coupling changes or when the accessory driven by the coupling freezes or becomes jammed. Relative slippage of the members produces an alternating current component in the direct current flow that is detected to indicate the slippage. The presence of an alternating current component can be sensed through a rectifier or frequency filter. Preferably, the presence of a persistent alternating current component causes a switch to open, interrupting the flow of direct current to the coupling. Interruption of the current flow disengages the coupling and prevents damage to other accessories that may be driven by the same endless belt and to the belt that engages the driven member of the coupling.
REFERENCES:
patent: 4340133 (1982-07-01), Blersch
patent: 4572343 (1986-02-01), Boffelli
patent: 4627525 (1986-12-01), Geldec
patent: 4749073 (1988-06-01), Olsen
Bonck Rodney H.
Dana Corporation
Pitts Andrea
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