Method for controlling motor to work by frequency converter
A frequency converter control and frequency converter technology, applied in control systems, AC motor control, electrical components, etc., can solve problems such as affecting product quality and output, affecting normal smelting of blast furnaces, and being unable to control motor work, and improving operation stability. , Improve production efficiency and product quality, and ensure the effect of normal smelting
Inactive Publication Date: 2017-11-03
JIANGSU YONGGANG GROUP CO LTD
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Problems solved by technology
At present, the mode of controlling the motor by the frequency converter mostly adopts a single closed-loop control mode with an encoder. This mode of controlling the motor by the frequency converter has the following disadvantages: When the encoder fails, the frequency converter will stop working and cannot control the motor. Work, and then cause the hoisting and feeding device of the blast furnace to fail to operate normally, thus affecting the normal smelting of the blast furnace, affecting product quality and output
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[0011] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0012] Such as figure 1 As shown, the method for controlling the operation of a motor by a frequency converter includes the following steps:
[0013] (1) First preset two working modes in the inverter 1, one is open-loop control mode 2 without encoder, and the other is closed-loop control mode 3 with encoder;
[0014] (2) Next, set the transfer switch 4 and the power supply 5 outside the inverter 1, and electrically connect one end of the power supply 5 to one end of the transfer switch 4, and connect the other end of the transfer switch 4 to the working mode of the inverter 1 through a signal cable. The control terminal 6 is electrically connected, and the input end of the encoder 7 is electrically connected to the output end of the motor 8, the output end of the encoder 7 is electrically connected to the input end of the inverter 1, and the ...
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The invention discloses a method for controlling a motor to work by a frequency converter. The method comprises the following steps that (1) an open-loop control working mode without a coder and a closed-loop control working mode with the coder are set in the frequency converter in advance; (2) a conversion switch and a power supply are arranged outside the frequency converter, wherein the power supply is connected with one end of the conversion switch, the other end of the conversion switch is connected with a working mode control end of the frequency converter, the coder is connected with a motor and is connected with the frequency converter, and the frequency converter is connected with the motor; and (3) the conversion switch is not connected with the power supply when the coder normally works, the working mode control end acquires a low-frequency signal at the moment, and the frequency converter controls the motor to work in the closed-loop control working mode with the coder; and the conversion switch is connected with the power supply when a fault occurs in the coder, the working mode control end acquires a high-frequency signal at the moment, and the frequency converter controls the motor to work in the open-loop control working mode without the coder. The method has the advantage that the frequency converter can effectively control the motor to work no matter when the fault occurs in the coder.
Description
technical field [0001] The invention relates to the technical field of blast furnace ironmaking equipment, in particular to a method for controlling the operation of a motor by a frequency converter. Background technique [0002] In the blast furnace ironmaking process, the blast furnace winch feeding device is one of the important equipment for blast furnace ironmaking. Guarantee the normal needs of blast furnace ironmaking. The frequency converter is an important part of the hoisting and feeding device of the blast furnace, and is mainly used to control the hoisting motor. At present, the mode of controlling the motor by the frequency converter mostly adopts a single closed-loop control mode with an encoder. This mode of controlling the motor by the frequency converter has the following disadvantages: When the encoder fails, the frequency converter will stop working and cannot control the motor. Work, and then cause the hoisting and feeding device of the blast furnace to...
Claims
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IPC IPC(8): H02P27/04
CPCH02P27/04
Inventor 周斌项卫兵田红军沈冰
Owner JIANGSU YONGGANG GROUP CO LTD