Safety method and apparatus for resistive start of electromotors

Details Safety method and apparatus for resistive start of electromotors Safety method and apparatus for resistive start of electromotors

1998-07-29

2000-04-04

Nappi, Robert E.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318767, 318783, 318812, H02P 126

Patent

active

060465697

ABSTRACT:
The windings of the electromotor at the starting are connected to the main power through starting resistors for a very short period of time, before being directly connected to the main power source.
A voltage is initially established at the terminals of a voltage control resistor provided by at least one of the starting resistors, or a fraction thereof, before the running of the motor will occur and the direct connection of the motor windings to the main power is allowed only when the voltage across the voltage control resistor has decreased with respect to the voltage initially established at the starting of the motor. The temperature difference between the voltage control resistor, or a fraction thereof, and the ambient is also sensed and any new start of the motor will be prevented till the temperature of the control resistor is not adequately decreased.

REFERENCES:
patent: 3555356 (1971-01-01), Kaiser
patent: 3695054 (1972-10-01), Barry
patent: 3737752 (1973-06-01), Strachan
patent: 3761792 (1973-09-01), Whitney et al.
patent: 4017778 (1977-04-01), Koch
patent: 4644239 (1987-02-01), Yoshilawa et al.
patent: 4716486 (1987-12-01), Sobiepanek et al.
patent: 4743816 (1988-05-01), Prather
patent: 5589753 (1996-12-01), Kadah et al.

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