"Kalman Rubinson" wrote in message
...
On Thu, 13 Aug 2009 15:19:26 +1000, "Trevor Wilson"
wrote:
"Bret L" wrote in message
...
I think the motors on Linn tables (besides the newest DC ones) were
originally Philips, became Airpax and are now Danaher. Does anyone
have part numbers on these things?
Can either motor be run on either 50 or 60 Hz for different speeds
(for applications other than turntables) or is each dedicated to its
frequency for all applications?
**No. The pulley diameter is changed to accommodate different frequency of
operation. Motor windings are arranged as serial of parallel to accomodate
117VAC or 220/240VAC.
He was not asking about voltage.
**I am aware of that. Since he needed to ask the question, I opted to supply
additional information to forestall any future stupid questions.
The use of the different pulleys
should tell you that the motor, itself, will run at different speeds
when driven at different frequencies.
If so how much variance to (vary/trim
play speed) is considered OK by the maker?
**Presumably none.
If these are standard synchronous motors (and I believe they are),
they can run on 50 or 60Hz or, indeed, other line frequencies as well.
Of course, the speed will be proportional to the line frequency.
**Hence the requirement for different motor pulleys.
I have built variable-frequency drives for such motors.
**So have many others.
--
Trevor Wilson
www.rageaudio.com.au