Cordless Drill

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  • Brushless motor has electronics tronic commutation istead of brushes. It is more efficient and longer life than brushed.
  • It is also simpler to build per see, as the complexity goes into the controller
  • Lithium ion + brushless motor are state of art - [1]

BLDC Motor Controller

  • 65x40 mm size, 300W, 24V, $20 - [2]


  • NiCd batteries are less environmentally friendly chemistry
  • But Lithium is a scarce resource
  • Comparisons n of bats - [3]

Geared Motor, not BLDC

Brushless (BLDC)

  • 12/24 - 3000 RPM - [5]