Re: [TCML] Synchronous Motor Question

[futuret@xxxxxxx]

 generally speaking though, an AC motor rated at 1800 rpm will
actually be a sync motor.  I can't really imagine a typical 1800 rpm
ac motor not being synchonous.  (I suppose in rare cases it could be,
but I haven't seen it).  Usually the rated rpm for a regular non-sync
induction motor would be around 1725 rpm, which is considerably
different than 1800 rpm.  I admit there may be various rare, unusual
motors around that I haven't seen.

An induction motor may be good for gap use, but it doesn't mean
it's good enough for sync gap use.  I can't imagine any plain
induction motor (non-modified) being good enough for sync gap
use.  

Although you may be technically correct in some ways, I stand
by my original statements (there may be some rare exceptions).

John

 


 

 

-----Original Message-----
From: davep@xxxxxxxx
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Wed, Mar 3, 2010 8:50 pm
Subject: Re: [TCML] Synchronous Motor Question



> ... the RPM will tell you if it's a sync motor, but it won't tell you
> if it's a salient pole sync motor.

    A _synchronous_ motor is a distinct subtype.
    Any motor will have a rated RPM.  That RPM might match that of
    a synchronous motor: if the motor is not, internally, a
    synchronous motor, its not synchronous.

    Ferinstance an 'induction motor' will have a 'synchronous
    speed' spec.  Its not a synchronous motor.  Some induction
    motors are 'synchronous enough' for gap use.

    (This is from a generic motor spec point of view, rather than
     coiling specific...)

    best
     dwp

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