Regarding DC motor drivers and PLC

Karan2905

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• Aug 30, 2020

• #1

I have to control a bi- directional dc motor. The whole control of dc motor would be through a motor driver that would be connected to PLC. The motor drivers are very costly and don't fit my budget. So suggest me something so that i can create a motor driver by myself or any other solution to my problem. Also the motor driver must be Compatible with the PLC.

 

kallileo

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• Aug 30, 2020

• #2

Do you need to control the speed of the DC motor?
How many amps? Voltage?

 

Karan2905

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• Aug 30, 2020

• #3

It would be a small dc motor ranging from 1.5 Volts to 12 volts. The application of motor would be only to turn clockwise 90 degrees and then turn anticlockwise 90 degrees so it can be on the initial position after a specific time period. There is no certain speed requirement but speed must be medium.

 

kallileo

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• Aug 30, 2020

• #4

If you want something really cheap then you can find hundreds pwm controllers for small dc motors on Ebay, Aliexpress etc from 2 to 50€.

 

BryanG

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• Aug 30, 2020

• #5

So the cheap way is to choose a combined motor and gearbox that gives the output speed you want. Use relays to control the direction the motor runs. Let the PLC control the relays.

 

Karan2905

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• Aug 30, 2020

• #6

But as we know that motor drive not only controls the speed of a motor but also protects the motors form tear down . Also it increase the voltage required to run the motor and controls the direction of motor. Can a relay would be able to control all these function that a motor driver controls?

 

BryanG

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• Aug 30, 2020

• #7

No, two relays would just control the direction of the motor but would be cheap. If you want to control the speed you will have to pay more. Not sure what 'tear down' is so I can't help with that part.

 

Jeev

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• Aug 30, 2020

• #8

Use a H-Bridge circuit driven with PWM and a basic opto encoder. This will do what you want and only requires some basic electronic knowledge.

 

Last edited: Aug 30, 2020