Re: synchronous motor

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <FutureT-at-aol-dot-com>

Justin,

There are a number of ways to attach the disc to the motor.

1)   Use an arbor which can be from a drill chuck.  In this
case, you don't use the chuck, but the arbor fits over the
motor shaft, and has a threaded portion on the other end.
This goes through the disc and a nut is tightened onto the
threaded portion of arbor.  These arbors are available
without the drill chuck.  (I don't know where to find or buy
any of the items I mention.)

2)  Find a small pulley which fits onto the motor shaft.  Drill
and tap 3 or 4 holes into the pulley, and drill matching holes
into the disc.  Use a strong pulley and strong screws to hold the
disc to the pulley

4)  Find some other pulley-like object which fits the motor
shaft and use it as in (3) above.  Sometimes it is possible
to drill only a center hole and use a large bolt at the center
if the pulley is long, so it extends past the end of the motor 
shaft.  If you use just a center bolt, be sure to use a star-
gripping washer beneath the rotor, and one under the screw
so the disc won't spin loose.  There's a tendency for the
disc to loosen the screw when the motor is shut off.......
especially if there's any self-braking going on, in the case
of a large motor used with the electrical sync gap phase
shifter circuit.

5)  Have a special hub machined specially for the disc.

John