CN201294472Y

CN201294472Y - Corotation and inversion circuit of DC motor implemented by controlling relay through PLC

Info

Publication number: CN201294472Y
Application number: CNU2008201602978U
Authority: CN
Inventors: 李明杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-09-16
Filing date: 2008-09-16
Publication date: 2009-08-19
Anticipated expiration: 2018-09-16

Abstract

The utility model relates to a PLC control relay realizing a positive inverted circuit of a direct current motor, the motor is suitable for the conditions the direct current motor frequently rotate in the positive direction and the reverse direction. The PLC control relay mainly comprises a PLC, a control relay, a direct current speed adjusting board and a direct current motor. The PLC control relay has the advantages of low cost, low failure, reducing the contact capacity of the relay and realizing the starting, the positive rotation and the reverse rotation of a motor, the relay has no spark, and the service life of the relay is greatly improved.

Description

The PLC control relay is realized DC motor positive and negative rotation circuit

Technical field

The utility model relates to a kind of PLC control relay and realizes DC motor positive and negative rotation circuit, and this circuit is suitable for the frequent rotating occasion of direct current machine.

Background technology

Direct Current Governor System has simple in structure, and is anti-interference strong, easy to maintenance, low-speed high-torque, and special in lower with rotating ratio under the constant power, exportable high torque be that AC variable-frequency speed regulation system is incomparable, and the AC servo cost is too high.But in the general small-power Direct Current Governor System, motor positive and inverse is general direct to be controlled with relay, and the contact of relay burns out easily in this case, simultaneously the DC speed regulation power supply is had greater impact, thereby breakdown rate is raise.

Summary of the invention

The circuit of the purpose of this utility model reliability when to be that design is a kind of improve the frequent rotating of small-power Direct Current Governor System, the spark that relay produces when eliminating motor positive and inverse reduces the impact of motor to the DC speed regulation power supply, prolongs equipment life.

Structural design of the present utility model is achieved in that AC power links to each other with interface L, the N of DC speed regulation power supply U1 and Programmable Logic Controller PLC, DC speed regulation power supply U1 links to each other with relay J 1, relay J 1 links to each other with direct current machine M1, interface P40, the COM1 of DC speed regulation power supply U1 links to each other with corresponding interface P40, the COM1 of single-chip microcomputer PLC, and relay J 1 links to each other with the interface P41 of single-chip microcomputer PLC.

When direct current machine M1 was just changeing starting, PLC sent instruction by single-chip microcomputer, and the control relay J1 that closes earlier makes DC speed regulation power supply U1 link to each other with direct current machine M1, and behind the elapsed time t, single-chip microcomputer PLC sends instruction, starting DC speed regulation power supply U1, and direct current machine M1 just changes; Described time t is greater than the pickup time of relay J 1.

When direct current machine M1 need stop, single-chip microcomputer PLC closed DC speed regulation power supply U1 earlier, behind the elapsed time T, unclamped control relay J1, direct current machine M1 stall; Described time T is greater than the die-away time of DC speed regulation power supply U1.

During direct current machine M1 counter-rotating, single-chip microcomputer PLC directly sends instruction, starting DC speed regulation power supply U1, and direct current machine M1 begins counter-rotating.

During direct current machine M1 stall, single-chip microcomputer PLC sends instruction, closes DC speed regulation power supply U1; Because the action of single-chip microcomputer PLC control relay J1 and single-chip microcomputer PLC control DC speed regulation power supply U1 start-stop, the centre is separated by a period of time, thereby realizes the rotating of the contact no-spark control direct current machine M1 of relay J 1.

Single-chip microcomputer PLC control relay realization DC motor positive and negative rotation circuit is made up of DC speed regulation power supply U1, control relay J1, single-chip microcomputer PLC, direct current machine.

As shown in Figure 1: civil power AV220V links to each other with DC speed regulation power supply U1 and single-chip microcomputer PLC, and DC speed regulation power supply U1 links to each other with relay J 1, and relay J 1 links to each other with direct current machine M1, and DC speed regulation power supply U1, relay J 1 link to each other with PLC again.

Advantage of the present utility model: the spark when eliminating direct current machine starting, rotating between the control relay contact, prolong the relay life-span, reduce the impact of direct current machine simultaneously to DC power supply.

Description of drawings

Fig. 1 is an electrical schematic diagram of the present utility model.

Fig. 2 is motor control loop figure

Fig. 3 is PLC control circuit figure

Fig. 4 is a single-chip microcomputer PLC program diagram of the present utility model.

Fig. 5 is a circuit block diagram of the present utility model.

Embodiment

As shown in Figure 1: AC power links to each other with interface L, the N of DC speed regulation power supply U1 and single-chip microcomputer PLC, DC speed regulation power supply U1 links to each other with relay J 1, relay J 1 links to each other with direct current machine M1, interface P40, the COM1 of DC speed regulation power supply U1 links to each other with corresponding interface P40, the COM1 of single-chip microcomputer PLC, and relay J 1 links to each other with the interface P41 of single-chip microcomputer PLC.

The course of work of the present utility model:

Direct current machine M1 just changes: PLC sends instruction by single-chip microcomputer, and control relay J1 is closed, and after 0.2 second, single-chip microcomputer PLC sends instruction more excessively, makes DC speed regulation power supply U1 starting, and direct current machine M1 begins just to change.

Direct current machine M1 stops: PLC sends instruction by single-chip microcomputer, the first DC speed regulation power supply U1 that disconnects, and after 0.2 second, single-chip microcomputer PLC sends instruction again, and control relay J1 is unclamped, direct current machine M1 stall excessively.

Direct current machine M1 counter-rotating: PLC sends instruction by single-chip microcomputer, conducting DC speed regulation power supply U1, direct current machine M1 counter-rotating.

Core of the present utility model is to utilize single-chip microcomputer PLC control DC speed regulation power supply U1 to compare with blanking time and the pickup time of relay J 1, the die-away time of DC speed regulation power supply U1 between the control relay J1, realizes the starting of small-power direct current machine M1 no current, positive and reverse rotation control circuit.Therefore the DC motor positive and negative rotation control circuit of this mode of every employing all belongs to protection range of the present utility model.

Claims

1, a kind of PLC control relay is realized DC motor positive and negative rotation circuit, it is characterized in that: DC speed regulation power supply (U1) links to each other with relay (J1), relay (J1) links to each other with direct current machine (M1), the interface of DC speed regulation power supply (U1) (P40, COM1) links to each other with the corresponding interface (P40, COM1) of single-chip microcomputer (PLC), and relay (J1) links to each other with the interface (P41) of single-chip microcomputer (PLC).