Re: Torque needed to spin the secondary?

• To: tesla-at-pupman-dot-com
• Subject: Re: Torque needed to spin the secondary?
• From: "Max Erhard" <max.erhard-at-softhome-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Thu, 13 Apr 2000 14:53:15 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

You don't need any torque to keep it moving, only to accelerate it
(Newtons second law, if I'm not mistaken), the enemy is friction, how
good bearings can you get ?. A small syncronous motor would be a nice
thing to use, microwave turntable motors are suprisingly strong for
their size and you probably have a supply of them (:-)), I see from your
website you are another MOT'er.

Max Erhard (UK)

Tesla List wrote:
> 
> Original Poster: "Marco Denicolai" <Marco.Denicolai-at-tellabs.fi>
> 
> Hello all.
> 
> I need to buy a motor to spin my 60 kg secondary form. It is a 1.8 m long
tube,
> 400 mm diameter, weights all together 60 kg.
> 
> How many Nm torque the motor must supply to have it turning?
> 
> I calculated 30 kg on 0.2 m, that is 300N on 0.3 m, that is 100 Nm. If we now
> think the weight is distributed on the whole 0.2 m radius and take the
integral
> for the radius length, we get to 50 Nm (one half).
> 
> Is 50 Nm correct (some knowledge of mechanics needed, help!) ?
> 
> Regards

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