Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1985-06-03
1987-01-06
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318729, H02P 128, H02P 130
Patent
active
046349510
ABSTRACT:
Gradual starting of an electric motor is provided by increasing the voltage applied to the motor. A reduced voltage starter controls the application of a voltage derived from a line voltage to a motor by using a voltage ramp acceleration control circuit comprising, means for generating a ramp voltage having a predetermined rate of rise, means for controlling the voltage applied to the motor in response to the ramp voltage, means for sensing that the motor is running at substantially full speed, and means responsive to the means for sensing that the motor is running at substantially full speed for increasing the predetermined rate of rise of the ramp voltage, whereby under conditions where the motor is running at substantially full speed before the voltage applied to the motor reaches the line voltage, then the voltage applied to the motor will rise at the increased predetermined rate of rise of the ramp voltage.
REFERENCES:
patent: 3670237 (1972-06-01), Hubel et al.
patent: 4072880 (1978-02-01), Oshima et al.
patent: 4355274 (1982-10-01), Bourbeau
patent: 4384243 (1983-05-01), Muskovac
patent: 4404511 (1983-09-01), Nola
patent: 4468603 (1984-08-01), Vander Meer et al.
Curran, Jr. Earl J.
Graefe Richard J.
Kampf Julian C.
Libert James T.
Reichard Jeffrey A.
Johnston A. Sidney
Potthast James W.
Smith Jr. David
Square D Company
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