صنع محرك الطائرة اللاسلكية

من طرف **Admin** الأربعاء فبراير 25, 2015 9:21 pm

Little motor, ordered at Conrad a few years ago.
Price then some E 0,25

صنع محرك الطائرة اللاسلكية Conr-mot-open

The little motor opened up.

The wires, loosened from the collector.
Then the collector removed from the shaft.
Wire thickness: 0,41mm
Number of windings each coil: 33.

The dimensions of this stator are the
same as the armature of a SPEED280.
But the coils of a S280 have more windings,
and thinner wire.

صنع محرك الطائرة اللاسلكية Label%20conrad

Packaging label of the motor mentioned above.

Shaft pushed a little more to the front.

Three connecting wires soldered to the wires of
the coils.
Soldered to just the same 3 coil wire-loops
that was originally attached to the collector.
The three coils of these kind of motors are
interconnected in a way called "triangle", I kept it
that way.
Shaft and connecting wires pushed into holes,
drilled into a piece of epoxy-fibreglass plate.

Pushed all the way down.
The three wires bent back and pushed into
three additional holes, just to secure them.

The three electrical connecting points.

Here I filled the space between coils and fibreglass
with slow curing epoxy resin.

Good resin penetration into the wires of the coils.

ROTOR CONSTRUCTION:

The separate parts for
the rotor-support,
and for the ball bearings.
Glue them together with
good quality epoxy resin.

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On a lathe, turn the outside diameter
down to19,5mm. (not yet done here)
Ball bearings: 2mm / 5mm.

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Steel pipe, outside ± 22mm.
On a lathe the outside turned down to 21,8mm.
The inside turned to 19,5mm.

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The different rotor parts glued together.

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Rare-earth magnets (neodym).
Each magnet measures 7x3x2mm.

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4 groups of 6 magnets each, glued to the
inside of the rotor ring with CA glue.
Each magnet in a group has the same
magnetical orientation as the group,
and each group has the opposite magnetical orientation to the next group.
Seen clockwise(or CCW): N-S-N-S.

THE MOTOR WITH 4X6 MAGNETS IN THE ROTOR
4X6 means 4 groups of 6 magnets in each group

ROTOR with 4x6 magnets

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STATOR

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PROP
5,5x4

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CONTROLLER 3-phase
brushless&sensorless

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	MOTOR + PROP 5,5x4"
	Mounted on a scale for testing. The prop pushes the air up, so the resulting reaction pushes the scale down. This is a nice result. Achieved by 8,6V and10,4A. When I raise the voltage above 8,6V, the motor starts to "[url=http://home.solcon.nl/gjkool/brushlessE5.html#wat is misfire]misfire[/url]" again.

The differences between using the rotor with 4x4 magnets (see previous page)
and the rotor with 4x6 magnets: (see above):
-The strong vibrations are now a lot less,
-Lower maximum no-load speed, due to increased magnetic force,
-Increased maximum torque with fully loaded motor,
-The border where "[url=http://home.solcon.nl/gjkool/brushlessE5.html#wat is misfire]misfire[/url]" starts, is shifted to a higher input / output power.

THE SAME MOTOR AS ABOVE, BUT WITH 4X8 MAGNETS IN THE ROTOR.
(8 magnets added.)

Because it made such a difference the last time, I could not resist adding another 8 magnets.
There was space left for extra 8 magnets anyway, and if you don't try it you will never know the difference!

	This is what it looks like with those 8 extra magnets added. All empty space filled....
	What are the results? I hate to admit it, but those nasty vibrations are back...But not as strong as with the 4x4 magnets set-up (see previous page). What you read here on the scale is the prop push just before "[url=http://home.solcon.nl/gjkool/brushlessE5.html#wat is misfire]misfire[/url]" starts. This is an increase from 380 to 454 grams. It was also possible to increase the prop size to 6x3" This 454-gram prop-push is reached with 9,04V, 12,4A, and 15850 rpm. (112Watts input) 12,4A is quite a current for such a small motor, but for a short time it presents no problem at all. The maximum power increased noticeably compared to the 4x6 magnets! The mass and rigidity of the grey 6x3 prop used here, contributes in minimizing the vibrations that are only generated at certain low rpm's.
	The completed motor-prop assembly. Prop fitted as push-prop Ready for mounting in the pibros 49 gram is what this unit weighs, Prop weight is 7 grams. That means the motor alone weighs 42 grams. Just as much as a S280 brushed motor. But if you stress a S280 to is maximum, it may give you some 150-gram of prop-push, un-geared. I had never expected such good results with this cheap material.