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Motor Control

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7 replies to this topic

#1 jhenise

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Posted 13 October 2013 - 10:02 AM



I want to be able to control the speed of a motor from about 0-15000 RPM using my Lab Jack  U6 and DAQ Factory.


The motor's power can be about 1/8 - 1 HP being able to plug it into normal 110 or 220 V AC would be nice..


does anyone know of a cheep motor / motor controller combo I could use for this?






#2 MCT Support

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Posted 14 October 2013 - 08:25 AM

Start by looking at the IDCA-10 on LabJack's accessories page (http://labjack.com/catalog/idca-10).  The IDCA-10 is compatible with the U6 and might be a good fit for you application.  MCT also sells motors to give you the controller/motor pair you are looking for (http://www.mocontech.com/buy/Accessories.html).  You will have to provide an external DC power supply to power the controller and motor.


Can you give us some more detials on the requirements you posted above?  We need the maximum speed and torque requirments to properly size a motor.   A motor to meet your requirements as stated can be small or very big depending on where your maximum operating point is.   We can help you select a motor.

#3 jhenise

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Posted 26 November 2013 - 05:26 PM

I am trying to control a router motor.

It is a brush type universal motor.

They can be controlled with reostats.

Is there some sort of device that will take a +/- 10 v from the lab jack and act as a reostat to control the voltage of a 10 A 110 v ac circuit?

I have a similar application where I want to replace a potentiometer on a circuit board with one that can be controlled by the lab jack with a +/- 10 v signal. Does something like this exist?

#4 jhenise

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Posted 27 November 2013 - 07:04 PM

i found a controller that will do the job with the lab jack


#5 LabJack Support

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Posted 30 November 2013 - 08:04 AM

I see that takes a 0-5V speed control signal, so looks pretty straightforward.

#6 MCT Support

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Posted 01 December 2013 - 05:01 AM

That is a very slick solution and looks like it will do exactly what you need.  Keep us posted on your progress.

#7 jhenise

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Posted 02 December 2013 - 01:25 PM

It sounds nice except the super PID controller: http://www.vhipe.com...nstructions.pdf

wont allow you to run the motor under 5000 RPM...


so I am still looking!

#8 MCT Support

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Posted 03 December 2013 - 02:33 PM

Some other options that come to mind are solid state relays (SSRs) or developing your own control circuit, using triacs.  Both would require more work on your end than a COTS solution.  Here is some information from Crydom on SSR basics. 


http://www.crydom.co...ching types.pdf


They recommend a random turn-on type for inductive loads such as motors, although they don's specificly refer to using the SSR as a power control device for motors.  Probably more like a switch.  I don't see why you couldn't use the random turn-on to control conduction time over a specified number of cycles (60 hz) and thus controll the average power to the motor.  For example, five cycles on and five cycles off.  The timing will be important for smooth operation from your motor.  In any case, you want to chop the signal to be in terms of full cycles.  Trying to chop faster than one cycle will cause problems for the same reson you can't use a light dimmer on a ceiling fan.

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