Wound Rotor vs Squirrel Cage 14

Hello OhioAviator,

Although I fully agree with and support much of what has been said here, I believe you need to consider each application on a case-by-case basis, particularly if you are aiming achieve best performance with the lowest possible capital outlay.

Wound Rotor Motors are capable of producing high torque when controlled via a &#;properly engineered&#; liquid resistance starter. Their torque/speed characteristics are also well suited to applications that present transient over-load conditions and this can be further enhanced in shredding applications through the addition of a flywheel to the mechanical system. On the down side they do require more maintenance than a Squirrel Cage Motors and this needs to be factored into the decision making process.

Medium (and High) Voltage Squirrel Cage Motors are notorious for their poor start performance, often exhibiting levels of Locked Rotor Torque less than rated or Full Load Torque. As has been advised by Marke the addition of a soft starter will act to reduce starting torque further and therefore it is likely problems will be experienced here. This might also explain comments by DougMSOE! On a more positive note some motor manufacturers will design and manufacture Medium Voltage Cage Motors to your specifications, thus allowing you (possibly) to utilize Full Voltage Starting techniques.

As suggested by TheDOG, a Cage Motor controlled via a Variable Speed Drive will provide the best overall performance......dollars permitting of-course!

If your clients are anything like mine (unlimited dollars are not available to them), an analysis of motor and load curves should assist to determine best starting method for the intended application.

Regards,
GGOSS

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