KR970069862A - A variable driving device of a crane that adaptively uses a vector control method and a V / F control method - Google Patents

Abstract

The present invention relates to a variable drive device for a crane, and more particularly, to a variable drive device for a crane, which detects whether an induced motor M is in operation in accordance with a pulse state of a PG pulse generated by driving an induction motor M, By selectively applying the F control method and the vector control method, the induction motor (M) can be stably driven even in a harsh environment, and the induction motor can be controlled to a high degree according to the hoisting / have.

Description

A variable driving device of a crane that adaptively uses a vector control method and a V / F control method

Since this is a trivial issue, I did not include the contents of the text.

FIG. 1 is a schematic block diagram of a general crane, and FIG. 2 is a block diagram of a variable drive device of a crane according to the present invention.

Claims (3)

There is provided an apparatus for driving an induction motor installed in a crane for conveying a conveyed article according to an operation state, the apparatus comprising: a DC power source for converting an AC power source into an AC power source and outputting the AC power source to the induction motor; An inverter section; A current sensor for sensing an amount of an AC power supplied to the induction motor and outputting a predetermined current sensing signal; A PG generator for outputting a PG pulse whose cycle is changed according to a driving speed of the induction motor; In response to an operation command for conveying the heavy object at a desired speed, outputs a speed control signal corresponding to the vector control method and outputs a speed control signal corresponding to the V / F control method for correctly driving the induction motor An operation command input unit for outputting a frequency control signal; Wherein the control unit is configured to detect an error of the induction motor based on a pulse state of the PG pulse and to output a predetermined error detection signal to the operation command input unit when the induction motor is in an error state, An error detecting unit for outputting a predetermined switching signal to the switching unit; A V / F controller for outputting a gate pattern pulse corresponding to a frequency control signal applied from the operation command input unit; A vector control unit for outputting a vector pattern pulse corresponding to a predetermined frequency control signal to be humanized from the operation command input unit; A switching unit, connected to the V / F control unit and the vector control unit, for outputting either a gate pattern pulse or a vector pattern pulse according to a switching signal of the error detection unit; And a gate pulse generator receiving a gate pattern pulse or a vector pattern pulse from the switching unit and outputting a gate pulse according to a V / F control scheme or a vector control scheme to the inverter. F control system of the crane. The method according to claim 1, wherein the vector control unit generates a vector pattern pulse through a vector operation of the current sense signal and the PG pulse, and a variable control system for adaptively using a V / F control system Driving device. The method according to claim 1 or 2, wherein the gate pulse generator receives a pulse pattern-modulated vector pattern pulse or a gate pattern pulse and a crane that adaptively uses a V / F control scheme Variable drive. ※ Note: It is disclosed by the contents of the first application.