Brushless Motor Winding - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-29-2010, 05:14 PM   #1
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Question Brushless Motor Winding

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I'm getting ready to purchase my first electric brushless motor. Being a rookie at electrics, I was wondering what significance the number of windings has on the motor? Does more windings = more torque/power?

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Old 06-30-2010, 05:01 PM   #2
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Re: Brushless Motor Winding

In the old brushed days, the smaller the number of windings the higher the current draw and the higher the RPM.

Of more importance today in brushless motors would be the number of poles and the KV rating of the motor.
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Old 07-01-2010, 11:32 PM   #3
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Re: Brushless Motor Winding

Originally Posted by eskimo View Post
...Does more windings = more torque/power?

Not really. Speed and torque are a trade off. Looking at similar sized outrunners, generally the more turns means less torque and more speed and smaller prop, less turns would be bigger prop less speed and more torque. Here is a chart with similar sized outrunners you can look at.

When getting started best and cheapest way to size motor for your model is to search forums (here, RCGroups and others) for threads on the airframe you need a motor for and search the thread for motors that others have used and work well in that airframe. Otherwise you end up with a collection of motors in the drawer, don't ask how I know. Also read up on how to size the battery and esc properly to accommodate the selected motor/prop combination. You will also definitely want a watt meter.
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Old 07-02-2010, 07:13 AM   #4
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Re: Brushless Motor Winding

Originally Posted by eskimo View Post
I'm getting ready to purchase my first electric brushless motor. Being a rookie at electrics, I was wondering what significance the number of windings has on the motor? Does more windings = more torque/power?

Less windings = more power = slower speed = Larger/greater pitch prop

When considering a model use the following article to figure out how much power you need.

Calculating power is simple once you have all the facts.. Power = Battery Voltage x Motor Current.

The problem is getting the correct values.. For my calculations on a 3 Cell battery is use 12V as the average voltage. You have to look at a the motor specs to determine the current it will draw. Some sites post 30A(lucky you) or they only post the power 610W and they also post the operational voltage in number of cells, 3 -7 cells. So you have to figure out if that's 610W on 7 cells or 3 cells. Generally the motor will draw the equivalent current to get the same 610W, on 3 cells that will be twice the current as compared to a 6 cell battery (which the motor windings may not be able to handle) and this is a very important number to consider as it affects the ESC you choose and battery sizing.

Make sure the ESC current rating is at least 25% greater than the maximum current rating you need to avoid burning it up or thermal shutdown.

Last issue is selecting a battery with the appropriate mAh value and C rating to give you the current draw you need to supply the motor with the current it needs ...

What a lot to consider, I agree with the suggestion that you should research the model you plan to fly in order to select the correct setup instead of reinventing the wheel. A lot of the opinions are usually way over powered (too much weight as a result) as electric is still new and most people don't correctly calculate the required power for the model.

Have fun............
Do not be divided from the truth by what you would like to Believe!
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