Micro Brushless Motor

homemade single phase brushless motor from a 1.83mm diameter x 1mm long magnet. weight is 35mg with prop. prop is spinning at about 36,000 RPM.

this was eventually used to power this plane: http://www.youtube.com/watch?v=_JlLmHVNhTM

this works similar to a computer cooling fan, which is brushless but only has two wires (+,-). on brushless motors a sensor of some kind is needed to operate the motor correctly. this is because the motor has no physical way to determine its angular position (unlike brushed motors), this information is needed to tell the motor when to energize the different coil windings or phases which makes it spin continuously. on three phase motors the "sensor" is just one of the 3 phases (depending on the angular position of the motor). each phase is just a coil of wire. all the phases are connected in such a way that 3 wires come from the motor to connect to the controller board or ESC. the ESC switches power to two coils at any given time and uses the third as the "sensing coil" where it detects a small electrical charge generated in the coil by the spinning motor. this can be used to infer an angular position if you know information about the motor and do a bit of math.

on these two wire motors the sensor is located on the motor itself (as well as other electronics to control the spin). this sensor is usually in the form of a hall-effect sensor which measures electromagnetic fields. the third wire can then be eliminated and only a constant power source can be given to the motor: (+) and (-). its basically like a brushless motor with a built in ESC. going back to computer cooling fans: these are two phase motors, they have two coil sets and a sensor to constantly measure angular position. my motor is one phase, so it has one coil and a sensor and controller circuit on top of the motor to measure its angular position and stuff. i give it power, which is why only two wires go to it.

more info here: http://www.rcgroups.com/forums/showthread.php?t=596219

Category:

Science & Technology

Tags:

• micro
• motor
• brushless
• single
• phase
• prop

[greatkid1]

what is the part number on the hall effect sensor?

[angrymonk55]

@greatkid1 allegro microsystems - A1442

[greatkid1]

how did you drill through the magnet?

[angrymonk55]

@greatkid1

I didn't, the magnet already had a hole in it.

[greatkid1]

@angrymonk55 where did you get the magnet from? I haven't been able to find any in that size

[angrymonk55]

@greatkid1 supermagnetman [dot ] net

[angrymonk55]

@greatkid1 google supermagnetman

[beast10165]

i realy want that motor

[gricka31]

0.035g? wow

[mavinn3000]

you can build the smallest airplain not larger than a mach...

[returnlegend3]

awesome..:)

[abrahamguzmanochoa]

si yo tmbiennlo necesito para haacer unvion con ese mini motor

[abrahamguzmanochoa]

como lo isite m lo esplicas paso pasom con mateeria te lo agradeceria

[oboi2104]

put it on a paperplane

[croncong]

Good, I like that you share this video, I wish success always homemade single phase brushless motor from a 1.83mm diameter x 1mm long magnet.

[fitnesus]

Nice Video That You Share , So Very Nice Thanks You homemade single phase brushless motor from a 1.83mm diameter x 1mm long magnet. weight is 35mg with pro

[lupabuatchannel]

I Really Like The Video From Your homemade single phase brushless motor from a 1.83mm diameter x 1mm long magnet

[cenedywong]

Your Video Is Very Useful Sharing Micro Brushless Motor