Motor

[Mike2]

Hi

I am looking to buy a small motor but am unsure at the amount of torque that is needed. I am looking to use the motor to be able to pull down a car sun roller blind.

Example:
http://www.halfords.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&langId=-1&catalogId=10151&productId=174246&categoryId=52216

If possible could you please advise me on a motor that may be suitable for this application or the range or torque that maybe needed?

Thanks Mike

[Mike2]

Anyone? Any ideas on how I could work out how much Torque I would need?

[MP]

I don't think you have gotten any replies because this is pretty much a bogus question. Who could know how much tension is in the spring in this shade? You should contact the manufacturer or distributor and see if they have any torque specs.

MP

[Mike2]

Hi, thanks for your responses.

The diameter is 10mm (1CM), and it takes a weight of 624grams to pull the shade down 40cm.

Is it possible to work the torque required from this information?

These are the motors I have been looking at: http://www.maplin.co.uk/module.aspx?TabID=1&criteria=motor&ModuleNo=43357&doy=21m12

Thanks.

[MP]

The formula:
HP = (V*I*Eff)/746)*5252
T= (HP /RPM)

thus

[Mike2]

Hmm, so basically from the information I have I can't work it out.

May as well just buy one and hope it works. :S

Unless has any other ideas, or an guesstimate...?

Would 1,000 in torque be enough?

[Mike2]

OK, thanks for your help!