Fade motor

Other Hardware General Electronics
1

Hi there,

i am new to arduino, never used something like that and i am not that good in electrical engineering but i want to learn about that with this device. i just bought a arduino uno and found this tutorial: http://arduino.cc/en/Tutorial/Fading

but how would i fade a motor like this with huge power drain? http://www.rcmodelle24.de/brushless-motoren/brushless-motor-1-10/lrp-vector-k4-brushless-motor-6-5-turn-typ-540er/a-188/

as i imagen the arduino will send a voltage from 0 to 5 V by analogWrite(0) to analogWrite(255). Am i right?
but what do i need if i like to use a motor with 7.4 V and up to 300 Watts?

thanks for help

greetings

2

If it is an RC motor, then an appropriate RC ESC can be driven using the servo library.

3

imagen about a motor like this

http://www.chinadcmotors.com/photo/pd25239-dc_electric_motor_rf_300_ca.jpg?iact=rc&dur=332&ei=TUWMToKsJYjzsgbO7sWMAg&page=1&tbnh=131&tbnw=188&start=0&ndsp=57&ved=1t:429,r:25,s:0&tx=143&ty=47

with only + and ground and huge power drain. how about this?

4

See reply #1

5

ok maybe i dont get it... my 2nd pictures does not show an RC motor and has only 2 wires. anyway i cannot find any ESC to buy. all my results end up like "you have to use a ESC" but where to get one?

6

From an RC store.

my 2nd pictures does not show an RC motor and has only 2 wires

Some RC car motors are rated up to 20 or 30 amps at 7.2V, and they have only two wires.

7

If you just want simple speed control you can just wire the motor to a motor driver and apply PWM to it.

http://www.thebox.myzen.co.uk/Workshop/Motors_1.html
and
http://www.thebox.myzen.co.uk/Workshop/Motors_2.html

But the sorts of current you are taking about are quite high for home construction and way out of reach for a beginner.
As AWOL says you are much better off buying a motor controller.

8

If you're buying ESCs for motors be careful of the difference between the brushed (rare) and brushless (common) ESCs. A 2-wire DC motor requires a brushed ESC and a 3-wire DC motor needs a brushless ESC.

9

What's rare about a brushed motor RC ESC?
They been around for decades.

10

i cannot find any ESC to buy. all my results end up like "you have to use a ESC" but where to get one?

One obvios place to by an esc would be in the shop you mention http://www.rcmodelle24.de/

A cheaper alternative:

http://www.giantcod.co.uk/18-amp-esc-c-21_88.html

This is for bruchsless motors. The disadvantage of using one of these is that they only are able to make the motor go one way.

If you want 2 way action you should look at motors and ecs's for boats or cars.

There are to main categorys of brushless motors: sensorless (most common) and sensored (mainly car and boats) .

The sensored motors use small hall-effect sensors to "sence" the rotation of the motor, and these types needs special esc's that are able to read the sensors (they have more than 3 wires connected to the motor)

@AWOL
Brushed esc are rare because nobody use thém anymore, and that means it is hard (not imposible) to find a shop where you can buy one.