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Old Sep 18, 2013, 10:40 PM
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Micro homemade single phase brushless motor

Greetings,
This is my first effort to build a simple brushless motor. I am making and selling actuators. The smallest I can make is 50mg hinge. I thought of using that skill to build and sell some sub-gram brushless motors with an affordable price tag for all micro flyers. I have hoping to build a 50mg brushless motor which can give you about 1.5 grams of thrust.

This is my first attempt to it. Result looks promising.

Ultra micro homemade Brushless motor (0 min 50 sec)


I am almost done with the 2nd motor. This time I am using a magnet from a 7mm motor and going to try a little bigger motor and scale it down to a magnet from those micro linear servo magnets you find in various 4CH heli servos.

I am also hoping to build a brushless ultra micro servos.

Please share your knowledge in this subject and let me come up with some ultra micro stuff with reasonable pricing. I am ready to send free samples to those who really have capability to benchmark the performance of them.

Thank you
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Old Sep 19, 2013, 07:02 AM
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Surrey, UK
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Looks good, it certainly runs. How big is this ? I'm guessing the prop is around 70mm diameter ?

When I made these I found getting the bearings embedded in the coil to be the hardest bit, do you wind the coil with them in place or do you have another clever idea ?

Keep up the good work

Rob
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Old Sep 19, 2013, 07:39 AM
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Thanks Rob, The prop is GWS 2508. This is built using a 1 gram actuator coil. Weight is about 1.2 grams.

Right now I am using an injection syringe part as the bearing. There is a little bit of friction. But for testing purpose its ok. I will try and use a bearing in my next design. I generally wind while the bearing is there.

I will keep you posted about my motor # 2.

any idea from where I can get some motor controlling chip? Digikey shipping is ridiculously high.

Cheers
Harsha
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Old Sep 19, 2013, 08:04 AM
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Harsha

Koichi Tanaka has some chips on 'easy to solder to' boards here
http://indoor-airplane-world.com/

I have not bought them for a while myself, if in doubt google it !

Rob
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Old Sep 19, 2013, 08:34 AM
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Thanks for the link Rob.

I am looking for the 6 milligram version since I am planning to complete my 700mg model.

Attaching a photo as well..
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Old Sep 19, 2013, 01:54 PM
yank and bank!!
Joined May 2013
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I can't help you with your development but I wanted to say that motor is very impressive.... a motor that makes 30 times as much thrust as it's own weight!!! you could almost power the paper airplanes made from a single sheet!!
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Old Sep 19, 2013, 08:00 PM
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What is the controller chip you are using?
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Old Sep 19, 2013, 09:10 PM
yank and bank!!
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I assume it a single winding motor....as such you should be able to use a very small microcontroller with a dac output into a fet and run readily available code snippets from the web.
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Old Sep 19, 2013, 10:23 PM
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Thanks for the encouragement.

I am using a chip from a CPU cooling fan. They have wiped off the numbers.

All I do is attach the negative and positive lead to my plantraco motor output. Everything is handle of the micro Rx. The motor controller works as a Hall Effect Sensor+IC I guess.

Once I complete my R&D, all of the sub-gram flyers will have access to a cheap source to buy sub-gram brushless motor from 50mg to 1gm. I am already making and shipping actuators in the range of 50mg to 1.1gm. My goal is to make nano stuff cheap!

Cheers,
Harsha
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Old Sep 20, 2013, 01:07 PM
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Harsha,

did you have a look there:
http://www.rcgroups.com/forums/showthread.php?t=596219
You should find there nearly any info on these motors.
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Old Sep 20, 2013, 01:09 PM
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Thank you for that link
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Old Mar 03, 2014, 02:17 PM
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How can the motor self start ? i can not ander I don't understand
mebay to explain please
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