Electricity: electrical systems and devices – Electrostatic capacitors – With protection or compensating means
Patent
1990-05-07
1991-12-24
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
With protection or compensating means
361329, H01G 108
Patent
active
050758152
ABSTRACT:
A universal capacitive power factor corrector usable with single or three phase inductive motors encases three capacitors, each of equal capacitance in the range of 15 to 60 microfarads, within a housing having an access hole and a removable front wall. Each of the capacitors has first and second electrical terminals. In single phase motors, a first insulated conductor electrically connects each of the first electrical terminals and a second insulated conductor electrically connects each of the second electrical terminals. For three phase inductive motors, a first insulated conductor electrically connects the first terminals of the first and the third capacitors, a second insulated conductor electrically connects the second terminals of the second and third capacitors and a third insulated conductor electrically connects the first terminals of the second capacitor and the second terminal of the first capacitor. Resistors electrically connect the conductors to dissipate the charge stored. The conductors extend through the access hole for electrical connection in parallel with the inductive motor. An appropriate number of connectors based on the motor horsepower can be connected in parallel to provide power factor correction appropriate to that horsepower. A minimal number of varied corrector sizes can thus be used to achieve correction for a wide range of motor sizes.
REFERENCES:
patent: 2264994 (1941-12-01), Marbury et al.
patent: 3098956 (1963-07-01), Hammer et al.
patent: 3441816 (1969-04-01), Butrico
patent: 3571676 (1971-03-01), Hottinger
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