Inverter and its frequency control method and crane

A frequency control and frequency converter technology, applied in the field of frequency converters, can solve the problem of not being able to guarantee sufficient torque output, and achieve the effect of avoiding the decline of output capacity

Active Publication Date: 2016-08-31
SUZHOU INOVANCE TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a frequency converter and its frequency control method and crane for the defect that the existing frequency converter still maintains the start-up given frequency operation and cannot guarantee to output sufficient torque when the power supply voltage drops.

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  • Inverter and its frequency control method and crane
  • Inverter and its frequency control method and crane
  • Inverter and its frequency control method and crane

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Embodiment Construction

[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0036] see figure 1 , is a flow chart of the frequency control method of the frequency converter according to the preferred embodiment of the present invention. Such as figure 1 As shown, the frequency control method of the frequency converter provided in this embodiment includes the following steps:

[0037] In step S0, the process starts.

[0038] In step S1, it is detected whether the bus voltage U of the inverter at the current moment is less than the deceleration operating voltage U 1 , if yes, go to step S2 to start the function of speed reduction with voltage, otherwise go to step S4. In this step, the inverter monitors the bus voltage U at the current moment of the inverter in real time. When the bus voltage U changes from the rated bus...

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Abstract

The present invention relates to a frequency converter and its frequency control method and crane, wherein the method includes the following steps: S1, detecting whether the bus voltage of the frequency converter at the current moment is lower than the deceleration operating voltage, and if so, turn to step S2 to start the function of deceleration with voltage, otherwise Go to step S4; S2, calculate the frequency according to the bus voltage at the current moment, the calculated frequency is lower than the rated frequency of the inverter, and set the output frequency of the inverter to run at the calculated frequency; S3, detect the current frequency of the inverter Whether the bus voltage is greater than the normal operating voltage at any time, if so, go to step S4 to exit the function of speed reduction with voltage, otherwise go to step S2; S4, set the output frequency of the inverter to the given frequency for normal power supply. The invention can automatically adjust the output frequency according to the voltage condition of the bus bar of the frequency converter, and avoids the potential safety hazard caused by the decrease of the output capacity of the frequency converter.

Description

technical field [0001] The invention relates to the technical field of frequency converters, more specifically, to a frequency converter, its frequency control method and a crane. Background technique [0002] During the operation of the frequency converter, when the external power supply voltage drops, the output capacity of the frequency converter will decrease. If the frequency converter is still running at the given frequency, the frequency converter cannot guarantee to output enough torque. At this time, if the load of the frequency converter is very large, there will be a great potential safety hazard. Especially in the field application of the lifting industry, because there are generally many power frequency equipment on site, the peripheral power supply voltage is very unstable. When the power frequency equipment starts, the power supply voltage can suddenly drop from 380V to 300V or even lower. If the load carried by the crane is very large at this time, it will b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66C13/22B66C15/00
Inventor 殷杰邱志红
Owner SUZHOU INOVANCE TECH CO LTD
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