Lego Technic Powered Up 3 Speed Automatic gearbox 2
Автор: Technic Brick Power
Загружено: 2021-07-23
Просмотров: 5304
Описание:
This video presents a revised version of an earlier Lego Technic Powered Up 3 speed automatic gearbox. The previous gearbox used a differential for torque measurement and used a powered up large motor to convert the differential rotation into a torque measurement.
However as it turns out it is possible to simply use the main motor (Lego Techni powered up XL Motor) speed measurement to infer the torque on that motor simply through the inverse linear relationship between the motor speed and it's load or torque. This saves the entire torque measurement portion of the gearbox resulting in a more compact and robust design.
The Lego Powered Up app was used on an iphone to program the automatic gear switching points using a calculation based on an electric motor power curve and the gearing ratio between the current gear and the gear being switched down to.
The final lego technic 3 speed automatic gearbox using the Powered Up components is demonstrated at the end of the video.
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