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Improvement method and structure of variable frequency speed regulation local control box of motor

A technology of frequency conversion speed regulation and control box, which is applied in the direction of AC motor control, control system, electrical components, etc., to achieve the effect of flexible speed regulation and control

Inactive Publication Date: 2015-07-01
GUIYANG AL-MG DESIGN & RES INST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

There are also some occasions, such as induced draft fans, smoke exhaust machines, especially loads such as smoke exhaust machines for flue gas purification, where the nature of the workload is relatively important, and power outages are not allowed. work, manual speed adjustment is required on site

Method used

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  • Improvement method and structure of variable frequency speed regulation local control box of motor
  • Improvement method and structure of variable frequency speed regulation local control box of motor

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Embodiment Construction

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings, but not as any limitation to the present invention.

[0015] An improved method for the local control box of motor frequency conversion speed regulation, such as figure 1 with figure 2 As shown, the method is to add a selection switch and a potentiometer on the local control box of the motor; the selection switch is connected in series between the coil of the relay KA4 in the local control box and the 220V AC power supply; Or the local speed given terminal connection on the standard user interface terminal of the frequency converter in the control room. The selector switch adopts a single-pole double-throw switch, and the single-pole double-throw switch has two options; when the remote is selected, the speed is adjusted by the remote, and when the local is selected, the speed is adjusted by the local control box.

[0016] The device constructed accor...

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Abstract

The invention discloses an improvement method and a device of a variable frequency speed regulation local control box of a motor. The method comprises the step of additionally arranging a selective switch and a rotary potentiometer on the local control box, wherein the selective switch is used for selecting a speed regulation position, namely selecting remote speed regulation or local speed regulation. The method makes full use of a use function of a standard interface of a frequency converter, and a local speed regulation controller is provided. According to the method, remote or local speed regulation control can be selected on site, so that speed regulation control is more flexible, and the method is applicable to all occasions with frequency converter use in a plant. The method can be realized by hardly increasing investment, has considerable flexibility and economy, and plays popularization significance.

Description

technical field [0001] The invention relates to an improved method and structure of an on-site control box for frequency conversion and speed regulation of a motor, and belongs to the technical field of frequency conversion and speed regulation of motors. Background technique [0002] In industrial electrical control, many motors are controlled by frequency converters. The frequency converters are installed in the power distribution room or control room, and a local control box is installed near the motor. The local control box can only control the start of the motor. And stop, no on-site speed control. [0003] This has many inconveniences in actual work. For example, when the jaw crusher adopts frequency conversion speed regulation, its speed regulation control is not very closely related to the upstream and downstream, and the on-site manual speed regulation can be carried out according to the actual crushing situation on site or according to the ammeter on the local box...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/04
CPCH02P27/04
Inventor 谢松泉
Owner GUIYANG AL-MG DESIGN & RES INST
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