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Default Garage roller door: electric motor (Update)

I've bitten the bullet and had the motor replaced. It was rated at 250
watts, 17rpm and 40Nm torque (figures which seem to imply an efficiency of
about 35%). It was about 60 cm long and only about 5 cm in diameter with no
sign of any gearbox.

It goes against the grain to admit it but I have so far been unable to get
it apart to examine it in more detail.

Stephen


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