1. Field of the Invention
The present invention relates to a phase-converter for converting a three phase motor to one phase operation.
2. Description of the Prior Art
In many rural areas, the only electrical power available is single phase power from REA lines. In many cases, large electrical motors are required, for example, for operating pump jacks of oil pumping units. Large single phase electrical motors, however, are not available, and phase converters are required for converting large three phase motors to single phase operation. In the past, the control relay for switching the large starting capacitors out of the circuit after start up of the motor have been operated by A-C power from the motor which reacts to the line voltage. Problems have occurred in that there is much voltage fluctuation on the rural lines which causes the control relay to repetitively switch the large starting capacitors in and out of the circuit. In many cases this has caused the starting capacitors or motor to be destroyed.