Going forward, Hybrid System drone (Sandwich Drone Project)

In this month I've worked on my generator, it is composed of a brushless motor, a glow one and a diode bridge rectifier, as you can see in picture

It was able to generate at max throttle about 1.2 kW , starting the motor is difficult, I don't love glow engines (I only figured it now ahah) but the point is that my generator works and with some modifications to reduces vibrations can be mounted on a drone.

What I want to do now is to use a gas motor to generate the energy because glow engines consume a lot more fuel (I will be able to generate 1 kW/h with 0.30 L ). 

I have also made a new frame to sustain a bigger cargo system (and the generator) 

I don't have enough money to buy the gas engine and also upgrade my old APM system to a new pixhawk one so I'm selling my laptop (I'm a student, and have also to pay the flight school) 

But I'm trying, the numbers are good 1kW is enough to sustain my configuration with 2KG  of cargo weight.

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Thank you for attention

Views: 1813

Comment by iSkyMaster on October 1, 2017 at 1:43pm

What diode are you using with the brushless motor?

Comment by iw28 on October 1, 2017 at 2:04pm

use active rectifier (synchronous rectification), as they are used in high effective converters. If interested mail me and I can help you with documentations.

Comment by Rana on October 1, 2017 at 9:51pm

That's nice findings, would you share your voltage and current measurements. Have you used rectifier like this;

Comment by Nicolai Valenti on October 2, 2017 at 1:03am

yes, this is my rectifier. The amperage is 66 (-+) and voltage 18 (-+)

Comment by iSkyMaster on October 2, 2017 at 1:07am

What is the diode part number you have used for the above design?

Comment by Nicolai Valenti on October 2, 2017 at 2:09am

there are six diodes 

Comment by Tommy Larsen on October 2, 2017 at 6:50am
I'm using the brushless engine to start my gas engine. Then i switch to generator mode.
Comment by iw28 on October 2, 2017 at 10:37am

Thats a similar project ive made, we used the following brushless engine to start the gasengine:
http://www.rcfair.com/en/product/989187/

and a similar circuit to this:
http://8085projects.info/active-rectifier-input-circuit.html

The part about this circuit could work both as the "harvester" when the engine is running and a starter for when the engine stops or etc

Comment by Nicolai Valenti on October 2, 2017 at 10:45am

please tell me which gas engine you have used, I want to buy one and I'm choosing

Comment by Charles Blouin on October 2, 2017 at 11:03am

A colleague of mine doing his phd was working on an inline power system for his thesis. It was to be used on a small airship: the inline generator could be used to recharge the batteries. It looks a bit like your setup! See page 11: https://ruor.uottawa.ca/handle/10393/31711

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