switching to brushless - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-09-2008, 11:09 AM   #1
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switching to brushless

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what is the rule about matching brushless motors with brushless motor controllers. will a 30 A controller handle motors up to 30A? how does this work. thanks
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Old 04-11-2008, 02:49 PM   #2
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Re: switching to brushless

Originally Posted by bugerdup
what is the rule about matching brushless motors with brushless motor controllers. will a 30 A controller handle motors up to 30A? how does this work. thanks

I only use Castle Creations "Phoenix" controllers, so others might be different - but I wouldn't think so.

Their controllers are rated as you said. For example, their Phoenix-10 is rated to deliver a continuous 10 Amps at full throttle setting. At lower throttle settings, the ESC still actually delivers 10A to your motor but it switches that current On/Off very fast using what they call PWM (Pulse width modulation). It is switched On/Off at a rate of ~ 12kHz (12,000 times/second). So for example, at 50% throttle setting, and assuming a 12kHz PWM rate, the ESC is delivering 10 Amps for ~41.5 microseconds (us) and then switching off for the next ~41.5 us..... over and over.....

If I have it straight, you can use a 20A ESC with a 10A motor, but you can't use a 10A ESC with a 20 A; Although I think I remember reading somewhere that ideally, you should match your ESC as close to but not under the rating of your motor. Had to do with efficiency or something - can't remember.

Some additional info is available on their website if you're interested:

Regards, John.
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