induction motor question

• To: tesla-at-pupman-dot-com
• Subject: induction motor question
• From: Gavin Hubbard <ghub005-at-xtra.co.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Wed, 14 Jul 1999 11:53:45 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hello List.

I am thinking of buying a second-hand 90 rpm (geared) induction motor to
use for winding larger coils. I tested the motor in the shop but found a
problem. 

The motor plate says to use a 15 uF start cap, but when I tried this (with
a known good cap) it wouldn't start unless it was given a turn by hand.
Obviously this would be no good for stop-start coil winding :-)

I don't know much about induction motors, but I'm guessing that the motor
plate does not take into account the extra torque needed to turn the
gearbox(?) How do I fix this? 

Thanks in advance for your help,

Gavin Hubbard

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