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Implementing DC motor positive and negative rotation circuit by PLC-controlled relay

A technology for controlling relays and DC motors, which is applied to the starter, motor generator/starter, starter parts, etc. of a single DC motor. It is easy to burn out and other problems, so as to reduce the impact and prolong the life.

Inactive Publication Date: 2009-02-18
李明杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The DC speed control system has the advantages of simple structure, strong anti-interference, convenient maintenance, low speed and high torque, especially when the speed is relatively low under the same power, it can output high torque, which is incomparable with the AC frequency conversion speed control system. And the AC servo system is too expensive
However, in general low-power DC speed control systems, the forward and reverse rotation of the motor is generally directly controlled by a relay. raised

Method used

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  • Implementing DC motor positive and negative rotation circuit by PLC-controlled relay
  • Implementing DC motor positive and negative rotation circuit by PLC-controlled relay
  • Implementing DC motor positive and negative rotation circuit by PLC-controlled relay

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Experimental program
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Embodiment Construction

[0017] Such as figure 1 Shown: the AC power supply is connected with the DC speed control power supply U1 and the interfaces L and N of the single-chip PLC, the DC speed control power supply U1 is connected with the relay J1, the relay J1 is connected with the DC motor M1, and the interfaces P40 and COM1 of the DC speed control power supply U1 are connected with The corresponding interface P40 and COM1 of the single-chip PLC are connected, and the relay J1 is connected with the interface P41 of the single-chip PLC.

[0018] Working process of the present invention:

[0019] Direct rotation of DC motor M1: The single-chip PLC issues an instruction to first close the control relay J1, and after 0.2 seconds, the single-chip PLC issues an instruction to start the DC speed control power supply U1, and the DC motor M1 begins to rotate forward.

[0020] DC motor M1 stops: the single-chip PLC issues an instruction to first disconnect the DC speed control power supply U1, and after 0....

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Abstract

The invention relates to a circuit for implementing natural rotation and inversion of DC by a PLC control relay, which is suitable for the situation of frequent alteration between natural rotation and inversion of a DC motor. The circuit is mainly composed of a PLC, a control relay, a DC speed regulation plate and a DC motor. The advantage of the invention is that the cost and failure rate are low, the capacity of the control relay contact is reduced, the startup as well as the natural and inverse rotation of the motor are implemented easily, the relay has non pyrophoric behavior, and the service lifetime of the relay is improved greatly.

Description

technical field [0001] The invention relates to a PLC control relay to realize a forward and reverse circuit of a direct current motor, and the circuit is suitable for occasions where the direct current motor is frequently forward and reverse. Background technique [0002] The DC speed control system has the advantages of simple structure, strong anti-interference, convenient maintenance, low speed and high torque, especially when the speed is relatively low under the same power, it can output high torque, which is incomparable with the AC frequency conversion speed control system. And the cost of the AC servo system is too high. However, in general low-power DC speed control systems, the forward and reverse rotation of the motor is generally directly controlled by a relay. raised. Contents of the invention [0003] The purpose of the present invention is to design a circuit that improves the reliability of the low-power DC speed control system during frequent positive a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/22H02P1/04
Inventor 李明杰
Owner 李明杰
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