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simple brushless motor

a cheap (<£10) and simple educational brushless motor, allowing adjustment of:

  • number of magnets
  • coil size and clearance
  • sensor phase angle
  • coil power timing

motor

BOM

electrical

schematic

  • P channel mosfet - capable of switching at least 1A
  • Hall effect sensor
  • copper wire for the coil - I used about 8m of 0.224mm copper wire, with an overall resistance of 3.8 Ohms
  • 2 1n4001 diodes. D2 is the flyback diode that protects the mosfet when it switches off.
  • 5k resistor
  • 10 uF cap
  • 10k potentiometer

mechanical

  • 10mm miniature bearing
  • prototyping board
  • [3d printed bobbin](4mm-bolt_motor2 v16_coil_1_Body1.stl)
  • laser cut rotor, coil mount & base plate
  • magnets - I used 5mm cylindrical

Links

Todo

  • put the pivot on the side of the breadboard for better hall effect alignment

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a cheap and simple educational brushless motor

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