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Old 07-11-2006, 06:34 AM   #1
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Default Dyno and Brushless?

Hi folks can i use a dyno to check a brushless motor?
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Old 07-11-2006, 07:19 AM   #2
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You can hook it up to a dyno, but you have to use your brushless ESC and electronics from your car to power it. At this time, there aren't any dynos on the market with the complicated electronics inside needed to run the brushless motors.
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Old 07-11-2006, 08:12 AM   #3
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What are you considering to be a Dyno? None of the current crop of dyno's can run a brushless.
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Old 07-11-2006, 08:14 AM   #4
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You can do it like the airplane guys do...get a prop with some reflective tape and an optical tachometer...grab full throttle and get an RPM reading.
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Old 07-11-2006, 01:36 PM   #5
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And if you wanna complete the 'old school' dyno, use an RPM motor holder set, get some fuel tubing and connect the brushless to a brushed slave motor, get some high wattage resistors and a meter... Short the resistors of various resistances across the slave motor while measuring the voltage drop. If you can figure out ohm's law you can guestimate the load put on the brushless system...

The whole shooting match can be run from the brushless esc.

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Old 07-11-2006, 05:25 PM   #6
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Does it make any sense dyno Brushless at all??? If you find out that your motor is worse than your buddy's what can you do about it?

Last edited by cvt01; 07-11-2006 at 10:18 PM.
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Old 07-11-2006, 05:31 PM   #7
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Here is a question, would it be possible to hook up a brushless speedcontroller in-line between a brushed dyno and the motor. And when you push test, just hold the speedo at full throttle on your controller(just need to have a receiver pack hooked to your receiver so you can have power to the receiver when the dyno is not activated)? This way the dyno will be able to read the volts, amps, etc.
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Old 07-12-2006, 01:42 PM   #8
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The one tricky bit is that I believe most of the dynos read the source Amp/Watt draw from the test motor, so it would be hard to get a full reading unless you can get the ammeter inside the dyno to read the draw on the brushless ESC.

You would still be able to measure acceleration and top RPM and so forth, but you wouldn't be able to measure efficiency because most of the dynos use a power applied / power realized at the flywheel/slave in order to determine how efficient the motor is. Maybe that's not a big deal though.

Also, it would be way better if you could get the dyno itself to control the throttle input on the ESC because anything time-dependent will get skewed by your reflexes and depending on the dyno/software this could either be a big deal or not so much.

You would probably need a way to defeat any safety/user error systems on the dynos as well. All of them have some form or another of checking to make sure the motor is connected properly, etc. It might be hard to get them to fire up without doing some tricks.

The other thing - that CVT mentioned is that getting the results is one thing, but being able to tune the motor afterwards is a different story.

It would be interesting though!
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