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Unread 01-07-2009, 05:21 PM   #11
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Default Re: how many amps does 3.1 HP motor draw

Here is how to figure out how many amps a motor draws...............I=amps..............
horsepower X 746 / Volts X Efficiency or HP x 746 / E x EFF. When Kilowatts are known...KW x 1000 / E, E=volts.
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Unread 01-07-2009, 05:22 PM   #12
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Default Re: how many amps does 3.1 HP motor draw

Quote:
Originally Posted by gmorrison View Post

For a detailed mathematical and theoretical treatment, look up "skin effect" on Wikipedia.

...the "skin effect"

Quote:
The skin effect is the tendency of an alternating electric current (AC) to distribute itself within a conductor so that the current density near the surface of the conductor is greater than that at its core. That is, the electric current tends to flow at the "skin" of the conductor.

Oh yea....while were at it lets add more confusion to the mix. A modern PWM controller switches anywhere from 16KHZ to 20KHZ........I don't care what the math says, I know what a larger cable does and so do thousands of other people who have installed larger cables on their carts.
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Unread 01-07-2009, 05:26 PM   #13
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Default Re: how many amps does 3.1 HP motor draw

4 gauge is KING. On a stock cart, you'll get more torque and about 1 MPH. Now for my question to this. What are you trying to figure out here?

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Unread 01-07-2009, 05:27 PM   #14
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Default Re: how many amps does 3.1 HP motor draw

Quote:
Originally Posted by gmorrison View Post
Whew this id getting confusing "Wikepedia" says

? Does electricity flow on the surface of a wire or through the inside?
A=In: Home Electricity
It's inside.

For DC (Direct Current) in typical conductor material like copper, aluminum, silver, etc., the conductor's charges are flowing distributed uniformly throughout the material.


For 60Hz AC (alternating current) in typical conductor material, the current is concentrated in the outer few centimeters of the cable. So if your cable diameter is less than one cm or so, then the current flows everywhere inside.

However, as the frequency increases, the current tends to get channeled closer to the surface of the conductor. At frequencies well above 60Hz, the current in the center of the conductor can be considered non-existent for all practical purposes. That is why radar units (which operate at frequencies anywhere from 1GHz to 15 GHz or more) usually transmit their eletrical energy through waveguides, which are really hollow tubes, either circular or rectangular. At those frequencies, no current exists anywhere except at the surface, so the hollow tube is effectively just the skin with no center. At UHF and microwave frequencies we can significantly improve the conductivity of copper cables and waveguides by applying a thin coating of silver.


For a detailed mathematical and theoretical treatment, look up "skin effect" on Wikipedia.
Most of the waveguide I installed years ago in the AM/FM/VHF/UHF bands were round and were copper with brass connections. This waveguide was not insulated but was isolation mounted.

On the other hand all of the microwave waveguide I installed was elliptical with a vinyl/rubber insulation.

Just some more fun facts!!!
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Unread 01-07-2009, 05:28 PM   #15
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Default Re: how many amps does 3.1 HP motor draw

Quote:
Originally Posted by roady89 View Post
...the "skin effect"




Oh yea....while were at it lets add more confusion to the mix. A modern PWM controller switches anywhere from 16KHZ to 20KHZ........I don't care what the math says, I know what a larger cable does and so do thousands of other people who have installed larger cables on their carts.
Roady my ugly's book doesn't cover this but will look in my other books. You are right though on the larger cables, besides they look coooooooolllllllllllllllllll!
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Unread 01-07-2009, 05:40 PM   #16
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Default Re: how many amps does 3.1 HP motor draw

well this got off the subject and started a debate but

I was wondering if anyone has taken a amp reading of motor before and after a 36v to 48 v conversion on same motor
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