Re: Need a variable-speed 2hp or greater AC motor for serious gap drive

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>

Hi Ken,

Assuming a constant acceleration.

V(r/s) = A(r/ss) x T

d(revolutions) = 1/2 x A x T^2 = 1

5000/60 = A x T = 83.333     A = 83.333 / T

2 = A x T^2

2 = 83.3333 / T x T^2  = 83.3333 T

T = 2 / 83.333 = 0.024 seconds

A = 3472 revolutions / secound^2

What is scarry, is that there was a big real of tape on the motor shaft 
too!!  Explosions of the real and armature (air core) windings were 
common...  This is why old tap reels had that big center hub...  Those old 
time tape drives packed one heck of a lot of power into turning those real 
super fast and hard!!  They may make a cool servo gap motor if one could 
control the beasts...

Cheers,

         Terry




At 04:36 PM 6/1/2003 -0500, you wrote:
> > Original poster: "Scott Hanson by way of Terry Fritz
><teslalist-at-qwest-dot-net>" <huil888-at-surfside-dot-net>
>
>[cut]
>
> > Also, there are large number of high-performance, ironless-core DC servo
> > motors (Servo Disk type) on the surplus market now (ex-computer tape drive
> > or large disk drive) that can accelerate from a dead stop to over 5,000
>RPM
> > in less than 1 revolution. This type of acceleration can destroy
>couplings,
>
>How long does this first revolution take?
>
>KEN