[Scania]

how to make this (http://www.alibaba.com/product-gs/20...cle_motor.html) motor to be a generate to produce a DC current?

a normal BLDC motor like RC plane & electric bike

[major]

Originally Posted by Scania

how to make this (http://www.alibaba.com/product-gs/20...cle_motor.html) motor to be a generate to produce a DC current?

a normal BLDC motor like RC plane & electric bike

Hi scania,

Your English seems a little broken. So I'm not quite sure what it is you want. But here goes.

Any motor can be used as a generator, or vice versa, if properly excited. Your link shows a brushless PM (permanent magnet) motor. So the PM sets the excitation. Therefore such a motor will generate simply by driving it with mechanical power (turning the shaft). The phase leads will output an alternating voltage. If you hook an electrical load to the phase leads, it will produce an alternating current. The magnitude will be proportional to the speed at which you drive the shaft.

If you need a DC output, you can simply rectify and filter the output. But this gives you an electrical source dependent on the speed at which you drive the shaft. In other words, the only regulation you have is mechanical. If you need further regulation, you need an "active" rectifier. Which would be the controller which was used for the BrushLess DC (BLDC) motor in the first place. This assumes that such a BLDC controller is capable of regeneration.

Hope that helps you.

major

[Scania]

how about this?

because it is my final year project, only buy & install will have low marks, I want to build more by myself.

[major]

Originally Posted by Scania

how about this?

Looks like it to me. But speed will have to be high enough to get generated voltage above battery voltage and diodes will only conduct when it is. And you have no way to regulate voltage or current except for controlling the speed. Give it a shot

major

[Scania]

if I want to put a Capacitor on the circuit to store the curren, how should I put?

How to calculate how much F I'll need?

[major]

Originally Posted by Scania

if I want to put a Capacitor on the circuit to store the curren, how should I put?

How to calculate how much F I'll need?

If only used with the battery, I don't think you need capacitor filter.

[Sunking]

Originally Posted by Scania

if I want to put a Capacitor on the circuit to store the curren, how should I put?

You do not need a capacitor, the battery in effect is a capacitor.