Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1978-10-30
1980-06-10
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361 25, 361 26, 361 32, 318473, H02H 708
Patent
active
042076021
ABSTRACT:
A three phase motor is constructed with each of the three phase windings thereof split in half so that the motor may be selectively connected for energization from either a relatively high or relatively low source. Motor protectors are provided in the form of a three pole automatic resetting overload relay means and two thermostatic switches. The heaters for the individual poles of the overload relay means are connected in series with a half section of the individual phase windings and do not have to be changed when either high or low voltage energization is selected for the motor. The thermostatic switches are embedded in two of the other three winding sections but electrically insulated from the motor winding. The control contact means of the overload relay means and the thermostatic switches are connected in series with the energizing coil of the electromagnet for the contact through which the motor is connected to its energizing source.
REFERENCES:
patent: 2304599 (1942-12-01), Rigby
patent: 2707763 (1955-05-01), Kurtz
patent: 3370201 (1968-02-01), Ward
patent: 3916257 (1975-10-01), Harper, Jr.
Haydu John L.
Heberlein, Jr. G. Erich
Kussy Frank W.
Gould Inc.
Salce Patrick R.
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