Controlling a simple DC brushed motor by PWM

[remo_om]

Hi guys,
I want to control a simple brushed DC motor (2 wires). I'm using a PLC with PWM output. I'm looking for a cheap and reliable solution to it. What element would be best for implementing the output to the motor?
the motor is 24v, 300w.
Thanks...

 

[(*steve*)]

You might be able to find a controller for an old ebike or escooter. 24V 300W brushed motors we're not uncommon prior to the use of brushless DC motors.

 

[Minder]

What make of PLC?
If you already have a PWM signal output then feed it into a suitable power Mosfet, add suitable supply for the motor.
M.

 

[Alec_t]

Do you need to reverse the motor or just control its speed? If reversal is required then things get more complicated.

 

[Minder]

One possible solution if reversal is needed, as you are using a PLC, total logic control can be achieved with a couple of spare outputs to control a common dual reversing contactor.
M.

 

[remo_om]

I like the Mosfet idea, but I don't know too much about it. Except of high frequency and the wattage, is there any other specifications that I need to take care about? Is zero crossing relevant in this case?
I do need also reversing the motor but this is not a problem (another 2 relays).
Thanks...

 

[Minder]

What is the nature of the PLC PWM output?
Not sure what is available where you are in the way of selection but 60v 50a Mosfets are fairly plentiful.
http://www.st.com/content/ccc/resou...df/jcr:content/translations/en.CD00002311.pdf
M.

 

[remo_om]

Thank for the replies.
Outputs specifications attached.

 

[Minder]

If the 100Khz is the freq of the PWM that is fairly high, But I suspect you should be able to do it with a suitable Mosfet.
If you Google PWM with Mosfet you should get many links to give you the general idea.
M.

 

[Alec_t]

Don't forget to allow the motor to come to a halt before reversing it, or something could get damaged.