Overvoltage protection circuit for synchronous machinerotor

Details Overvoltage protection circuit for synchronous machinerotor Overvoltage protection circuit for synchronous machinerotor

1984-04-20

1986-06-10

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 56, 361 91, H02H 709

Patent

active

045946329

ABSTRACT:
The rotor of a brushless synchronous machine, such as an alternator exciter machine, includes a field winding and a rectifier for applying full wave rectified power to the field winding. To protect the rectifier from excessive inverse voltages when such voltages are induced in the field winding, for example during motor starting, alternator paralleling, etc., the present invention employs an excessive voltage sensor and a triggerable bypass circuit for bypassing such excessive inverse voltage from the rectifier when the sensor senses such excessive inverse voltage. The sensor preferably includes a solid state relay capable of assuming either of two output conditions, depending on the magnitude, and with a prescribed input circuit, the polarity, as well, of a voltage induced in the field winding. The bypass circuit includes a pair of triggerable switches, such as SCR's or triacs, which operate in response to the output from the relay effectively to short circuit the rectifier when an excessive inverse voltage occurs; and the SCR's preferably are self commutating to open the bypass circuit in response to a polarity change of the induced field winding voltage and/or a prescribed input to the rectifier.

REFERENCES:
patent: 3381195 (1968-04-01), Hoffmann
patent: 4323942 (1982-04-01), Hartman et al.

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