Sum of torque

[dieter]

This is interesting, and in my special case: mind bending 


BR

[EOW]

Hi Dieter,

Do you understand my idea ?

For create energy, the motor can be at the Pulley2. The motor need to give -3FRwt to the Pulley2, the Support2 lost -FRwt. The Pulley1 recover +6FRwt because the Pulley1 turns at 2w in the lab frame reference and the radius is 3R.

Have a good day

[EOW]

The Support1 receives the force F and the Support2 receives the force -F. One support is helped to turn clockwise when the other support receives a counterclockwise torque. With gears (1, 2 and 3) it's possible to cancel the work of forces F and -F. Like that supports don't accelerate or decelerate. If the motor is put on the Pulley1 the energy is destroyed and if the motor is put on the Pulley2 the energy is created, no ?

[dieter]

Hi EOW,


I'm referring to #130. Example: when you rotate the left purple wheel, the big pulley (fixed) will rotate the small pulley 3x. So the small pulley may not be fixed to the right purple wheel, otherwise the belt will be blocked.


I have to confess, I do not see where the excess energy comes in or out.


BR

[dieter]

Hi EOW,


referring to #133, well, some people get upset by the terms "create + destroy energy " 


Let me see if I understand it:  The pulleys will give F and -F to the supports. But, one support gets 3 lengths of 1/3 force and the other gets -1 length of 1 force. Any rotation of the pulleys would make the supports rotate in opposite direction, or with a speed ratio if 1:3 (And then the belt would fall offl). But the gears will force the supports to rotate at the same speed, in the same direction?
So it cannot rotate at all?
I guess I didn't understand it. 


BR