Follow me as I attempt to build an fully autonomous flying craft (based off the movie The Terminator) called a Hunter Killer.

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Part 4: Specifications For the Motors, ESCs, And Battery

Posted 23rd August 2009 at 04:14 PM by ElectroMaster

Since I've never made anything like this before, choosing these parts was rather hard. I have done as much homework as possible but there is no way to know how well a part is going to work with another until you try it. So here are some details..

Motors: Mystery 5000 Rpm/V Outrunner Brushless Motor D2825-5000

Code:

Model: D2825-5000 
Rpm(Kv): 5000Rpm/V 
Max Currect: 25A 
Max Eff: 96% 
Weight: 35g ( Motor Net Weight ) 
Total Length: 40.1mm (Motor and Shaft) 
Motor Body Diameter: 27.8mm 
Shaft Diameter: 2.26mm(Front) 
Shaft Length: 13.9mm 
Recommended Input Voltage: 6 - 18 Volt

I was rather impressed with the weight a lot lighter than expected and the max current is perfect to allow more air time than orignally thought.

Electronic speed controllers: Mystery 30a ESC

Code:

Constant Current: 30A 
Input Voltage: 5.6V - 16.8V 
Max Current: 40A 
Low Voltage Cutoff: Shut Off / Power Reduce / Ignore 
Inside Impedance: 0.0044 
Reversion: Yes 
Size: 57mm X 25mm X 8mm 
Weight: 18g (Net Weight) 
PWM Frequency : 8KHZ/16KHZ

Since I ordered the Axon microcontroller a few days ago I've been reading about frequencies and timing. The PWM (Pulse Modulation Width) 8KHZ doesn't give us enough speed variations, so 16KHZ is perfect!

Battery: Mystery 25C 11.1V 2200 mAh Lipo Li-Po Battery

Code:

Capacity: 2200mAh 
Burst Rate : 30C (2200 X 30 = 66000mah = 66amps) 
Continuous discharge rate: 25C (2200 X 25 = 55000 = 55amps) 
Voltage: 11.1V 
Cells : 3 
Size :105mm x 33mm x 22mm 
Weight: 170g 
T / Deans Connector

This is a relatively light battery for the capacity and was a major factor in deciding on this battery. It will definitely have enough grunt to run two motors (25 amps each) Depending on the overall weight of the HK we might put two of these in or replace with a heaver more powerful version.

Posted in Robotics

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