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how should brushless motors be rated??

how should brushless motors be rated??

Old 10-23-2007, 11:31 PM
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Default how should brushless motors be rated??

with brushed motors being rated by number of winds, should brushless also be rated by number of winds, or by there kv ratings??? give my your opinion
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Old 10-23-2007, 11:34 PM
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I vote for KV rating so it's easier to calculate. lol. Naw, it doesn't matter much too me. Sorry for posting.
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Old 10-24-2007, 07:36 AM
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i agree, there should be some uniformity!

7xl
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Old 10-24-2007, 08:28 AM
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Either in Kv or in Power, otherwise a sintered and bonded motor of the same wind will have different power ratings, same for delta and wye winds..... but I think they need to get away from winding unless you use that for limited power classes.
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Old 10-24-2007, 09:20 AM
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Forever, I've been saying this:
Originally Posted by James35
According to the laws of physics, there is only 1 true way of classifying motors: The amount of power (Watts) produced at 7.2V.

(Kv rating is no good because it takes torque completely out of the equation. It's a rating with no load. It gives you an idea, but it's not an accurate way to measure power of a motor. You need to look at both RPM and Torque to determine the power of a motor.)

HP (Watts) = RPM x Torque
746 Watts = 1 electric horsepower
I love to quote Big Jim who used to say:
"Horsepower is horsepower! Speed then, is just a matter of gearing."

It's been my opinion for some time, that ROAR should determine our classes by power. Examples:
Spec class: 100 Watts of power maximum
Stock class: 150 Watts of power maximum
Super Stock class: 200 Watts of power maximum
Modified class: Unlimited power

This way, it does not matter who makes the motor, or how many windings it has, or the types of windings, or the magnets, bearings, or any technology etc.. This solution allows you to even mix and match brushed and brushless, and even different manufacturers. I think the only thing needed for this to happen is an increased availability of dynos.
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Old 11-16-2007, 05:33 PM
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Originally Posted by C_Suzuki
with brushed motors being rated by number of winds, should brushless also be rated by number of winds, or by there kv ratings??? give my your opinion
The Novak chart offers everything---winds, Kvs and Watts:

Novak Brushless Motor Spec Chart
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Old 11-18-2007, 05:07 PM
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i think wind info is best for separation for class structure, but it is also helpful if a manufacture gives Kv ratings on after market rotors. For motors specifically designed for things other than organized racing, Kv is a bit more helpful, especially when running higher voltage
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