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Control method for preventing overload of cantilever crane lifting variable-frequency motor

A frequency conversion motor, overload control technology, applied in the direction of AC motor control, control system, electrical components, etc., can solve the problems of cantilever lifting and lowering frequency conversion motor damage, unable to achieve motor overload protection and other problems

Active Publication Date: 2021-02-26
MAANSHAN IRON AND STEEL COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]For cantilever crane lifting variable frequency motors, since the power supply frequency converter of cantilever crane lifting variable frequency motors usually limits the current (or output torque limit) of the motor based on the motor current and Overcurrent (or motor short circuit) protection, however, this motor current limiting and overcurrent protection cannot realize frequent short-term overload protection of the motor
Based on this, when the lifting variable frequency motor of the cantilever crane is frequently overloaded or even stalled due to complex hoisting conditions or improper use, in this case, the lifting variable frequency motor of the cantilever crane may be damaged due to frequent short-term overload without protection

Method used

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  • Control method for preventing overload of cantilever crane lifting variable-frequency motor

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Embodiment Construction

[0010] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0011] exist figure 1 Among them, NSW is the "digital input switch" function block, when I='1', Y=X2, when I='0', Y=X1; NCM is the "value comparison" function block, when X1> When X2, QU is '1', when X1=X2, QE is '1', when X1<X2, QL is '1'; AVA is the "absolute value formation" function block; ADD is the "adder" function block; PDE is the "leading edge delay" function block; OR is the "or" gate; AND is the "and" gate; NOT is the "not" gate. Icz is the contin...

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PUM

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Abstract

The invention discloses a control method for preventing overload of a cantilever crane lifting variable frequency motor and belongs to the technical field of electrical transmission control. A controlprogram for preventing the overload of the cantilever crane lifting variable frequency motor is composed of two control units, namely, a cantilever crane lifting variable frequency motor transmissionsystem fault judgment unit is composed of functional blocks FXDGC11-FXDGC19; and a cantilever crane lifting speed control unit composed of functional blocks FXDGC01-FXDGC10. The method is simple andconvenient to operate, can be used for controlling various cantilever crane lifting variable-frequency motors based on the working characteristics of cantilever cranes, and can assist in well solvingthe problems of frequent short-time overload protection of the cantilever crane lifting variable-frequency motors.

Description

technical field [0001] The invention relates to the technical field of electric drive control, in particular to a control method for preventing the overload of a cantilever crane lifting frequency conversion motor. Background technique [0002] For cantilever crane lifting variable frequency motors, since the power supply frequency converter of cantilever crane lifting variable frequency motors usually performs current limiting (or output torque limiting) and overcurrent (or motor short circuit) protection on the motor based on the motor current, however, this motor current Limiting and overcurrent protection cannot realize frequent short-term overload protection of the motor. Based on this, when the lifting variable frequency motor of the cantilever crane is frequently overloaded or even stalled due to complex hoisting conditions or improper use, in this case, the lifting variable frequency motor of the cantilever crane may be damaged due to frequent short-term overload wit...

Claims

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Application Information

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IPC IPC(8): H02P27/04H02H7/085B66C13/22B66C15/00
CPCH02P27/04H02H7/0854B66C13/22B66C15/00
Inventor 叶光平
Owner MAANSHAN IRON AND STEEL COMPANY
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