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The drawbacks with direct drive mainly comes at low speeds and are for example:

  • More current for the same torque -> More powerful controller needed
  • Higher current for the same power -> Less efficient (more losses)
  • Less efficiency -> More heat generated
  • Lower RPM -> Insufficient cooling
  • More heat + Insufficient cooling -> You'll need a blower to avoid that the motor literally melts

So generally, unless you know what you're doing and have very good reasons for going direct drive you're better off keeping the gear box.
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