Howdy Everyone,

I need to computer-control an EBM-Pabst G1G170-AB05-20 electric motor. The spec sheet
http://img.ebmpapst.com/products/datasheets/EC-centrifugal-fan-G1G170AB0520-ENG.pdf
contains a circuit diagram for the control on page 4. The fan itself runs on AC plugged into the wall, but the control circuit is a 2-6 kHz PWM signal with an amplitude of ~30V.

Right now the best option I have for the actual computer control is using a 0-5V output on a NI USB-6009 using labview. That part is covered.

For the actual analog voltage to PWM control I picked up a kit at my local electronics shop.
http://www.kitsrus.com/pdf/k67v2.pdf

I will have to amplify my 5V output voltage to range between 5-15V for the control signal (I plan to use an op amp, will cover that later), and I will have to modify the components from the kit I purchased to output the proper PWM frequency (I am shooting for around 3 kHz) using the formula provided by the manufacturer.

I have included a schematic of how I would wire this once the PWM control is complete. The input/output "ports" on the PWM in my schematic match the available input/outputs according to the kit I bought.

My question, will this work with my setup?

I know there are many threads on the PWM, but all of them appear to be for direct control of the motor (i.e. a DC motor), and the person at the electronics store indicated that a control frequency of 2-6 kHz was beyond normal.

*Edit* To clarify, the motor runs at full speed without any PWM control. Also, I have attached another diagram with a setup I tried recently just to see if I was on the right track. The function generator was set to output a 3kHz square wave at 50% duty cycle. I then connected it as shown. That really didnt work.. the wires connecting the 40V supply to the system melted ><
Why didnt it work? And the motor still works so I guess it didnt do any permanent damage to anything except my alligator clips.
*End Edit*

Thank you for reading, I look forward to your replies/additional questions.

 

Howdy Everyone,

I need to computer-control an EBM-Pabst G1G170-AB05-20 electric motor. The spec sheet
http://img.ebmpapst.com/products/datasheets/EC-centrifugal-fan-G1G170AB0520-ENG.pdf
contains a circuit diagram for the control on page 4. The fan itself runs on AC plugged into the wall, but the control circuit is a 2-6 kHz PWM signal with an amplitude of ~30V.

Right now the best option I have for the actual computer control is using a 0-5V output on a NI USB-6009 using labview. That part is covered.

For the actual analog voltage to PWM control I picked up a kit at my local electronics shop.
http://www.kitsrus.com/pdf/k67v2.pdf

I will have to amplify my 5V output voltage to range between 5-15V for the control signal (I plan to use an op amp, will cover that later), and I will have to modify the components from the kit I purchased to output the proper PWM frequency (I am shooting for around 3 kHz) using the formula provided by the manufacturer.

I have included a schematic of how I would wire this once the PWM control is complete. The input/output "ports" on the PWM in my schematic match the available input/outputs according to the kit I bought.

My question, will this work with my setup?

I know there are many threads on the PWM, but all of them appear to be for direct control of the motor (i.e. a DC motor), and the person at the electronics store indicated that a control frequency of 2-6 kHz was beyond normal.

*Edit* To clarify, the motor runs at full speed without any PWM control. Also, I have attached another diagram with a setup I tried recently just to see if I was on the right track. The function generator was set to output a 3kHz square wave at 50% duty cycle. I then connected it as shown. That really didnt work.. the wires connecting the 40V supply to the system melted ><
Why didnt it work? And the motor still works so I guess it didnt do any permanent damage to anything except my alligator clips.
*End Edit*

Thank you for reading, I look forward to your replies/additional questions.

Hello. I'm looking to do the same thing. I have the same motor and I just want to control it with a dial. It's been some time once our posted here. Did you give up or have you found something that we can use?