Line to line to line to neutral converter

Details Line to line to line to neutral converter Line to line to line to neutral converter

1986-02-28

1989-12-12

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

363149, 328104, H02P 128

Patent

active

048870188

ABSTRACT:
A reduced voltage starter for gradually starting a polyphase motor having an acceleration control circuit for gradually applying power to the motor and detector circuits for detecting various fault conditions for terminating power to the motor. A shorted solid state switch detector senses when one of the semiconductor switches applying power to the motor is shorted to terminate the application of power from the remaining phases. A phase angle control circuit insures a uniform application of power to the motor. A phase rotation detection circuit detects when the three phases are in other than their correct sequence and terminates power in the event of such detection. An underload detection circuit senses when the current drops beneath a preselected reference after the motor has reached its full speed and terminates power in response to such detection. A line-to-line-to-line-to-neutral convertor produces signals representative of the line-to-neutral voltages which are necessary for other circuit functions.

REFERENCES:
patent: 3332008 (1967-07-01), Mueller et al.
patent: 4468603 (1984-08-01), Vander Meer et al.

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