DC motor control unit for Arduino

Other Hardware Motors, Mechanics, Power and CNC
1

Hi

I need a DC motor control unit for Arduino. Can you suggest a suitable unit? (adjustment range~40-180 V)

The motor is a DC shunt design with a 200VDC armature and 180VDC field. The motor current is 0.52/0.08 Amps which is quite low as the motor power is only 70 Watts.

Thanks

2

That's pretty specialized requirement, I doubt there's much off the shelf for that - are you looking
for field control or just PWM on the armature? What power supply voltage?

3

I have to wonder.. If you only need 70 Watts or power. Might a different motor might be cheaper than a controller for this type of motor? What is the application?

4

MarkT:
That's pretty specialized requirement, I doubt there's much off the shelf for that - are you looking
for field control or just PWM on the armature? What power supply voltage?

For field control and PWM. Power supply voltage is 230 V

Thanks

5

Sounds tricky - I didn't find anything very promising with Google - I suspect two separate controllers
might be needed, but high voltage low power isn't a common combination.

6

You might find something suitable from KB electronics.
http://www.kbelectronics.com/Variable_Speed_DC_Drives.html

7

MarkT:
Sounds tricky - I didn't find anything very promising with Google - I suspect two separate controllers
might be needed, but high voltage low power isn't a common combination.

How about this:

http://www.aliexpress.com/item/NEW-SCR-1000W-AC-220V-Input-DC-Motor-Driver-Adjuster-Controller-Speed-Governor/680987555.html?spm=2114.01010208.3.45.kHv2BD&ws_ab_test=searchweb201556_6,searchweb201644_1_505_506_503_504_10020_502_10001_10002_10017_10010_10005_10011_10006_10003_10021_10004_10022_10009_10008_10018_10019,searchweb201560_1,searchweb1451318400_-1,searchweb1451318411_-1&btsid=5d921f59-6a8d-4d6e-be5c-83cc67a20f9e

8

OR...

http://www.aliexpress.com/item/DC-Bag-making-machine-speed-control-board-DC-motor-speed-governor-displacement-DC-speed-control-board/738369306.html?spm=2114.01010208.3.1.FdVi6Q&ws_ab_test=searchweb201556_6,searchweb201644_1_505_506_503_504_10020_502_10001_10002_10017_10010_10005_10011_10006_10003_10021_10004_10022_10009_10008_10018_10019,searchweb201560_1,searchweb1451318400_-1,searchweb1451318411_-1&btsid=fe80696b-e13a-42d6-8125-8139868cc0bd

9

Maybe - you'll need to find mains-capable potentiometer, the whole circuit is live as far as
I can tell. You'd ideally want opto-isolated control of these?

10

vepakari
I'm working on much the same thing (see PWM question) .1 hp 110v armature supply, 110 v field supply.
I don't think there are any prefab packages out there for amateur construction and this high voltage so you are left with designing your own

I've found you're pretty much on your own re sensible design. Take a look at the elementary drawing which I posted in "PWM question". It's not the final product and I'm still working on it but it may give you some ideas. There's also the software to drive it and this requires some careful thought re type of regulator to use.

What is your final application? This will reflect into the regulator.

11

phoxx:
vepakari
I'm working on much the same thing (see PWM question) .1 hp 110v armature supply, 110 v field supply.
I don't think there are any prefab packages out there for amateur construction and this high voltage so you are left with designing your own

I've found you're pretty much on your own re sensible design. Take a look at the elementary drawing which I posted in "PWM question". It's not the final product and I'm still working on it but it may give you some ideas. There's also the software to drive it and this requires some careful thought re type of regulator to use.

What is your final application? This will reflect into the regulator.

Thanks. I looked at the attached pdf-file. Have you already made a circuit board. Supply voltage to the motor is 220 volts. What changes will make the connection? Can you help. How are you thinking to put the field magnetization on / off?

12

You might use an off the shelf controller from an industrial supplier and mod it for Arduino control.

https://www.grainger.com/ec/pdf/Dayton-Variable-Speed-DC-Drives-Spec-Sheet.pdf

13

I don't know what your supply is but if 120v you will need a step up transformer to, say 240v. If you have 240v supply you can use a full wave rectifier. This will give 339v peak. Just control back to 200v average. You will still need a transformer to get isolation from the mains supply so you can connect the Arduino ground to the negative side of the rectifier. This is necessary because you will want voltage and current feedback into the analog inputs of the Arduino. I've used a single MOSFET to control the voltage to the motor although it could be done with a MOSFET controlled bridge--this just looked too complicated.
The field can also be fed from the full wave rectifier but you will need a series resistor to set the current. The 180v field was designed with a series resistor in mind. Keep in mind that the field current must be the controlled variable, not the voltage. While rated field current is often not shown on the nameplate it is defined as the current which gives rated speed at rated voltage with rated load.

I'll try to get a reply to you soon with an elementary diagram of the current state (probably not final) of this project in the near future. My "circuit board" is more a breadboard at the moment and has gone through a couple of iterations.

14

Why not use a linear analog opto-isolator to feedback the voltage and a mains-rated isolated
current sensor? Surely less cumbersome that a large mains transformer.

15

Vepakari
Here is an elementary diagram showing the present state of the hardware side of the project. It may not be the final but is close. The software is the effort of the moment and I may or may not use PWM. If PWM it will be somewhat modified from the usual approach

DCPowerSupply4.pdf (30.3 KB)