Electricity: motive power systems – With signals – meters – recorders or testing devices
Patent
1978-09-19
1981-11-17
Smith, Jr., David
Electricity: motive power systems
With signals, meters, recorders or testing devices
318139, 318334, 318471, 340648, 340692, H02P 516
Patent
active
043013961
ABSTRACT:
A thermal current limiting controller for use in protecting the electric drive motor, controller and battery of an electrically propelled vehicle against damage thereto resulting from excessive temperature conditions. The controller is arranged to calculate the temperature condition of the motor as a function of the current flow therethrough and more specifically, integrates the current flow with respect to time so as to provide a control signal proportional to the calculated temperature condition. The control signal is utilized to limit the amount of current the drive motor is permitted to draw notwithstanding an attempt by the operator of the vehicle to cause the drive motor to draw greater current. The controller further includes an indicator which is responsive to the control signal to provide a variable indication of the temperature condition so as to warn the vehicle operator of the magnitude of the undesirable heating of the drive motor and, thus, the impairment of the system capabilities.
REFERENCES:
patent: 2740108 (1956-03-01), Plympton, Jr. et al.
patent: 3287975 (1966-11-01), Mason et al.
patent: 3711845 (1973-01-01), Chasek
patent: 3735291 (1973-05-01), Kahn et al.
patent: 3808516 (1974-04-01), Hentschel
patent: 3809960 (1974-05-01), Jossic
patent: 3860861 (1975-01-01), Gucker
patent: 3868554 (1975-02-01), Konrad
patent: 3989900 (1976-11-01), Thompson
patent: 4001649 (1977-01-01), Young
patent: 4032895 (1977-06-01), Klimo
"Electronic Motor Protection Relay Eliminates Overload Breakdowns", Design Engineering, Aug. 1975, p. 13.
Gould Inc.
Smith Jr. David
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