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3D RoboticsPermalink Reply by Chris Anderson on August 6, 2010 at 8:39am

You need to connect it to an external battery. Please see the diagram in the manual.

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Permalink Reply by kuxz on August 6, 2010 at 5:57pm

thanks!
And i would like to know can i use the code for dc motor for my brushless motor? Will it work?

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3D RoboticsPermalink Reply by Chris Anderson on August 6, 2010 at 6:00pm

I'm afraid I don't understand that question.

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Permalink Reply by Ken on August 6, 2010 at 6:21pm

Are you sure of your parts? R/C brushless motors have 3 wires; their controllers have 3 heavy output wires, 2 heavy battery wires, and the fine gauge R/C input (3 wires).

The input to brushed and brushless type ESCs is the same. Assuming you have R/C parts. So yes, the software is the same.

If you have some other form of controller (not R/C) and a 2-wire electronically commutated brushless motor (or it uses a capacitor to generate the 3rd phase), then there is no way for us to know what sort of input it takes.

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Permalink Reply by kuxz on August 7, 2010 at 12:55am

I mean can the programming code for controlling the speed of the DC motor to be use on brushless motor?
will it work the same as the DC motor?

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Permalink Reply by Peter Seddon on August 7, 2010 at 3:55am

I think there is confusion here between DC Motor and brushless motor.

For model aero purposes there are two types of motor - brushed DC motors and Brushless motors. The Brushed dc motor requires a suitable ESC that has two power wires going to the battery and two to the motor. The brushless motor has three wires from the ESC to the motor and two wires from the ESC to battery. Both types of ESC's have a three wire control lead that goes to the receiver or APM.

Brushless and Brushed ESC's are incompatible and cannot drive the other type of motor.

There is no reason why you could not theoretically use a brushed dc motor and ESC on an APM (for an Arducopter) but whether it would perform as well is another question.

Peter

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Permalink Reply by kuxz on August 7, 2010 at 5:42pm

i think i hve understand what u hve said.
Thks!

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Permalink Reply by Ken on August 7, 2010 at 6:29pm

im gld we cld hlp u.

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Permalink Reply by kuxz on August 8, 2010 at 4:41am

is a brushless motor also call a stepper motor?
is brushless motor = stepper motor?

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Permalink Reply by Paul Briesch on August 8, 2010 at 5:44am

Please see Wikipedia: http://en.wikipedia.org/wiki/Brushless_DC_electric_motor

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Permalink Reply by Ken on August 8, 2010 at 8:14am

Stepper motors are usually brushless. But the brushless motors used in R/C are different animals than the stepper motors used in electronic devices such as printers and scanners.

In English, a "stepper" usually refers to a device where certain coils or pairs of coils are energized in defined sequences causing the motor to step to a new position. There is often no position feedback, the motion is assumed to have taken place when the coil is energized and a small time has elapsed. Unless the motion is blocked, you know, by counting the steps you can tell how many (fractional) parts of a turn the motor has taken. These are useful for positioning print heads, scanning elements, certain robotics applications such as how far an arm has advanced, or how many turns of the drive wheel have happened, etc. These are not used for aircraft propellers where number of turns or propeller position does not matter, but extreme speed for prolonged time is.

In English, a "brushless" R/C motor is a high speed motor that does not keep track of position or number of rotations. The controller (ESC) uses two of three wires to cause the motor to advance, and by using feedback from the third wire it knows the position of the rotor. When the rotor comes to the proper location, the ESC applies power to a different pair of two wires and uses the third (formerly energized) wire to sense the position. This repeats.

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Permalink Reply by kuxz on August 9, 2010 at 7:53pm

how do i check whether my motor is a brushed, brushless ? N my ESC only has 2 wire going 2 motor n 3 wires from ESC to the APM.

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