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Motor rotating speed tracking method and device of frequency converter

A technology of motor speed and frequency converter, applied in the field of frequency converter, can solve problems such as difficulty in judging bus current, reduce system reliability, bus voltage fluctuation, etc., so as to save IO and software resource overhead, hardware cost and software resource. small effect

Active Publication Date: 2014-10-22
KINCO ELECTRIC SHENZHEN
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Problems solved by technology

[0010] The disadvantage of this method is that firstly, it is necessary to increase the detection device of the bus current, which increases the cost. The larger the model, the higher the cost, and reduces the reliability of the system; secondly, the bus voltage fluctuates, which causes the bus current to fluctuate accordingly, so it is difficult Determine whether the bus current is 0

Method used

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  • Motor rotating speed tracking method and device of frequency converter
  • Motor rotating speed tracking method and device of frequency converter
  • Motor rotating speed tracking method and device of frequency converter

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Embodiment Construction

[0041] In the method for the frequency converter to track the motor speed of the present invention, according to the preset V / F curve for tracking the motor speed, the output frequency and voltage of the frequency converter are continuously changed, the components of the stator current are monitored, and the current motor is judged according to the active component of the stator current. Whether it is running at the switching point of the motoring and generating state, and then the frequency of the switching point can get the actual speed of the motor.

[0042] Such as figure 1 As shown, the method for the frequency converter to track the motor speed according to an embodiment of the present invention includes the following steps:

[0043] S11. Start tracking the motor speed. In this step, set the running direction of the inverter, the initial value of the output frequency, the initial value of the output voltage and the V / F curve when tracking the motor speed for the first ti...

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Abstract

The invention provides a motor rotating speed tracking method of a frequency converter. The method comprises, according to a preset motor rotating speed tracking V / F (velocity / frequency) curve, continuously changing the output frequency and voltage of the frequency converter, monitoring components of stator current, determining whether a current motor works in the switching point between an electric state and a generating state according to the active components of the stator current, and further obtaining the actual rotating speed of the motor. The invention also discloses a motor rotating speed tracking device of the frequency converter.

Description

technical field [0001] The invention belongs to the field of frequency converters, and in particular relates to a method and a device for a frequency converter to track the rotational speed of a motor. [0002] Background technique [0003] Inverter is a device that converts fixed frequency alternating current into continuously adjustable frequency alternating current. Frequency conversion speed regulation has been recognized as one of the most ideal and promising speed regulation methods. And product quality and other aspects have a wide range of applications. [0004] When the motor is driven by a frequency converter, the initial state of the motor may not be in a static state, but may be in a rotating state for some reasons, such as the self-rotation of the fan under the action of the external wind force, and the shutdown of the drive due to failure. If the inverter starts to run directly from 0Hz, the motor is in the power generation state due to the difference between...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P23/00
Inventor 鲁凡水王茂峰
Owner KINCO ELECTRIC SHENZHEN
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