Comments for Question about AC Motors

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Question about AC Motors

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May 28, 2009
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Have you weighed it yet ?
by: KGround

1) Have you considered the weight of that motor ?

If it is a standard industrial type motor as your description implies, I would be surprised if it weighs much less than 3/4 of a ton. WAY too heavy for any normal vehicle conversion, especially when you consider the aded weight of batteries.

That is a major problem with all industrial three phase motors - weight is just not usually a consideration so they are made heavy.

2) I question that you really need that much horsepower for a car or small truck. Remember, that is an industrial continuous duty rating and you can probably push a three phase motor to 3 or 4 times (or more) of its continuous duty rating for short periods of acceleration (not as effectiviely as with a DC motor, but significant overtorque is available if you have the VFD output to suppport it). A normal car or light truck is only using 10-25 Hp while cruising at highway speeds. That is more like the continuous duty rating you should be considering. IMHO...