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Equipment, method and system used for lifting variable frequency motor and engineering machinery equipment

A technology of variable frequency motors and equipment, applied in control systems, AC motor control, electrical components, etc., can solve problems such as low lifting efficiency of variable frequency motors

Active Publication Date: 2012-08-22
ZOOMLION HEAVY IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can ensure the safety of the crane during lifting, the lifting efficiency of the variable frequency motor is low

Method used

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  • Equipment, method and system used for lifting variable frequency motor and engineering machinery equipment
  • Equipment, method and system used for lifting variable frequency motor and engineering machinery equipment
  • Equipment, method and system used for lifting variable frequency motor and engineering machinery equipment

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Embodiment Construction

[0019] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0020] figure 1 The structural diagram of the self-adaptive constant power speed regulation equipment provided by the present invention. Such as figure 1 As shown, the present invention provides an adaptive constant power speed regulation device for hoisting a variable frequency motor, which includes: a receiving device for receiving information indicating the output torque of the motor in a stable state of rotation speed; and a control device for calculating a frequency inversely proportional to the output torque according to the output torque and the rated power and number of pole pairs of the motor, and outputting the frequency to control the motor to opera...

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Abstract

The invention discloses equipment, a method and a system used for lifting a variable frequency motor and engineering machinery equipment. The self-adaption constant-power speed-regulating equipment comprises a receiving device and a control device, wherein the receiving device is used for receiving information used for indicating the output torque of the motor under a stable rotating speed state;and the control device is used for computing the frequency reciprocal to the output torque according to the output torque and the rated power and the number of pole-pairs of the motor, and outputtingthe frequency to control the motor to run according to the frequency. According to the equipment, the torque of a current load converted into an output shaft of the motor can be determined by the output torque of the motor under the stable rotating speed state, the frequency of the motor, reciprocal to the output torque, can be computed according to the torque, and then the motor is controlled torun according to the frequency, so that the lifting frequency can be lifted substantially under the condition of ensuring the safety, and the variable frequency motor can run at low speed when the load is large, and can run at high speed when the load is small.

Description

technical field [0001] The present invention relates to the field of construction machinery, in particular to a device, method, system and construction machinery equipment for hoisting a variable frequency motor. Background technique [0002] Frequency conversion is the main method used in modern times to start and adjust the speed of asynchronous AC motors. As a variable frequency power supply, the frequency converter has great flexibility, and the relationship between its output voltage and frequency can be adjusted according to the rules set artificially, and then the speed and torque of the motor can be adjusted. [0003] At present, in tower cranes, it is generally used to limit the load size or limit the speed to regulate the motor speed through the frequency converter. Although this method can ensure the safety of the crane during hoisting, the hoisting efficiency of the variable frequency motor is low. Contents of the invention [0004] The object of the present ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/04
Inventor 李学俊何首文许名熠张二玲方淼
Owner ZOOMLION HEAVY IND CO LTD
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