Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1993-02-03
1994-08-23
Wysocki, Jonathan
Electricity: motive power systems
Limitation of motor load, current, torque or force
361 25, H02H 704
Patent
active
053410777
ABSTRACT:
A current limiting device to limit the maximum allowable electric current to be supplied to a motor in driving an electric vehicle. The current limiting device includes (a) a first thermal switch to prevent the power switching element of the motor from being abnormally overheated, (b) a second thermal switch to prevent the motor from being abnormally overheated, and (c) a brake switch. The three switches altogether and in association with a certain hysteresis band work to switch the limits of the electric current passing through the motor between two or more predetermined electric current values. Under normal operating conditions, the limit of the current is set at a high level which is associated with a hysteresis action, and when one of the thermal switches or the brake switch is actuated, the limit of the electric current is switched to a lower value which is still associated with a hysteresis action.
REFERENCES:
patent: 3673538 (1972-06-01), Faxon
patent: 3868554 (1975-02-01), Konrad
patent: 4075674 (1978-02-01), Squires et al.
patent: 4291355 (1991-09-01), Dinger
patent: 4626753 (1986-12-01), Letterman
patent: 4901181 (1990-02-01), Miyanaga et al.
patent: 5189350 (1993-02-01), Mallett
Chang Hong-Shi
Chen Tshaw-Chuang
Shieh Yaw-Shih
Yang Huan-Jen
Industrial Technology Research Institute
Lianh W. Wayne
Wysocki Jonathan
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