Protective system for inverter circuit used in driving AC motors

Details Protective system for inverter circuit used in driving AC motors Protective system for inverter circuit used in driving AC motors

1979-10-31

1982-02-02

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318807, 318808, H02P 528

Patent

active

043141919

ABSTRACT:
The invention relates to a speed control system which includes an inverter circuit for converting a direct current into a polyphase alternating current in the form of a rectangular wave by the switching action of transistors, and an inverter drive circuit adapted to apply control signals to the inverter circuit to bring its output frequency to a desired value, an induction motor being rotated by the alternating current supplied by the inverter circuit. The system features current detection means for detecting current that flows through the output side of the inverter circuit, and decision means for examining the output of the current detection means for a fixed period at a frequency higher than that at which the induction motor is driven. The decision means interrupts the operation of the inverter circuit when it has been judged that the current flowing through the outside thereof is greater than a prescribed value, and actuates the inverter circuit when the current flowing through the output side thereof is less than the prescribed value. The result is that the inverter circuit is allowed to operate intermittently at a current which does not exceed a prescribed value, whereby the induction motor runs continuously without any observable halt in operation.

REFERENCES:
patent: 3577052 (1971-05-01), Bauer
patent: 3603856 (1971-09-01), Zalar et al.
patent: 3719873 (1973-03-01), Graf

Affiliated with

Also associated with

Rating

Protective system for inverter circuit used in driving AC motors does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Protective system for inverter circuit used in driving AC motors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Protective system for inverter circuit used in driving AC motors will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1823415