Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1992-11-16
1994-05-24
Shoop, Jr., William M.
Electricity: motive power systems
Limitation of motor load, current, torque or force
H02K 1732
Patent
active
053152212
ABSTRACT:
A first pole of a double pole switch selectively connects a battery to a motor in one switch condition and disconnects the motor and battery in a second switch condition, wherein a second switch pole connects a dynamic braking circuit around the motor. In the event contacts of the first pole weld closed and fail to open in the second switch condition, the second pole connects the fuse directly to the battery in shunt of the motor to cause the fuse to blow and open the circuit to the motor. Alternative embodiments incorporate time delays between switch operation and blowing of the fuse by incorporating a thermistor or an R-C timing circuit.
REFERENCES:
patent: 4980624 (1990-12-01), Bernhardt
patent: 5025198 (1991-06-01), Mordue et al.
patent: 5039926 (1991-08-01), Marishita et al.
patent: 5051670 (1991-09-01), De Piola
patent: 5126643 (1992-06-01), French
patent: 5214359 (1993-05-01), Herndon et al.
patent: 5225751 (1993-07-01), Kusano et al.
Eaton Corporation
Masih Karen
Shoop Jr. William M.
Vande Zande L.
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