What power supply to test hub motors

[knutselmaaster]

Hi all,

I'm building a hub motor test/work bench.
My idea is to have a place where I can simply install a hub, with or without wheel, plug it in and let it run.
(It would be helpful to lace/true wheels too.)

To be able to do that, I would need a ac/dc converter capable of giving 24 and 36 volts at least and preferably also 48v.
The motors that I will test will use 20A Max (on a bike).
As there is not much (physical) resistance in a free running hub engine I imagine that I won't need 20A for the tests?
What would I need to buy/build for this purpose?
Has anyone tried this?
Please share your thoughts.

 

[Animalector]

pretty much any 30V 3A Lab powersupply will achieve what you want. just buy two and series them up for 60V 3A. which should be enough to spin it. they're not expensive, under $200 each and good for other work as well. Search any electronics store website for lab powersupply. otherwise a meanwell supply maybe.

Andy

 

[knutselmaaster]

Thank you for your reply.
I find $200 a lot of money for some transforming...
For that price I can buy a good battery to test my motors plus I could use that on a bike too.

 

[Kepler]

I use a 60V 5A Lab supply. About $130 landed. http://www.ebay.com.au/itm/60V-5A-A...88?pt=LH_DefaultDomain_15&hash=item58a14c2218



Big advantage of testing controllers and motors with a bench power supply over a battery is that the current is limited. If something is wrong with the motor or controller when using a battery, things can get ugly very quickly. The Power supply is current limited so you are far less likely to do major damage. Also you have a full range of voltages available to you which can be very handy.

 

[knutselmaaster]

Ah yes, I now see the advantage of an external power supply.
To manage that with a battery I would have to use a controller/LCD combo with current control.
All together that will be more expensive and less practical.
Thanks for your clear explanation

 

[knutselmaaster]

Double post...

I found this one, it seems to do the same: http://hifimediy.com/0-60V-adjustable-power-supply-CPS-6005
For only €59

 

[Kepler]

Looks like it would do the job. is that a landed cost? Power supplies are heavy so not cheap to post.

 

[knutselmaaster]

No, I tried check out, there is 40€ shipping to be added.

 

[Blackyster]

Someone in the forum use a transformer+variac+rectifier bridge diode+capacitor for power supply motors, in this moment i cant remember the name of this person...

[youtube]JXLwM_-kJlA[/youtube]

You can use similar with:

TENMA 72-110 VARIABLE AUTO TRANSFORMER DataSheet

20WB60 Encapsulation:MODULE,Bridge Diode(600V 20A)

100v 15000uf Computer Grade 105c Bus Capacitor

Sorry for the huge pics