Re: [TCML] VFD motor

[bartb <bartb@xxxxxxxxxxxxxxxx>]

A VFD is rated to drive 3-phase motors of a given horse power. Don't try 
running a 2HP motor with a 1HP VFD. Also, the motors should be rated for 
frequency drive use (winding insulation).  They are "not" synchronous 
motors but vary their speed to maintain a given frequency. For example, 
if you want the motor to run at 60Hz, the VFD will attempt to maintain 
that frequency based on the direct feedback from the motor or the motor 
currents as the load changes. This has nothing to do with being synchronous.

VFD's for rotary spark gaps is in the application of varying the rotor 
speed during operation.

BTW, the VFD's which accept 1-ph in and provide 3-ph out are usually 
lower HP (roughly 1.5 or less).

Bart

ashumate3@xxxxxxx wrote:
> Any 3 phase motor can be used with a VFD. Some VFD's can be used on single  
> phase lines to run 3 phase motor. I did an installation where they need 35hp  
> motor to drive pump. Used a Allen Bradley VFD to do the job. Power company  
> upset, but had to live with it. They wanted to be paid for running 3Phase  line.
>  
> Al Shumate
>  
>  
> In a message dated 1/16/2009 9:51:54 A.M. Eastern Standard Time,  
> sdbogard@xxxxxxxxx writes:
>
> Quick  question guys,
> Does a motor to be used with a VFD have  to be modified for
> synchronous operation or can it be any old induction  motor.  Thanks.
>
> Scott  Bogard.
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