TD replications

[Floor]

@ all readers

This latest addition to the magnets motion and measurements project,
is a detailed explanation of how to calculate the work done by a force that is
changing with distance.  (like a magnetic force).


Please find the attached file   "MagnetForceIntegration 2.PDF"

     best wishes
             floor

               PS
               Nice Luc

[Cairun]

I'm sure Alex also knows this. As well, he and I know it would benefit to slow down the rotor once the magnets are in ideal position to the slider magnets to deliver maximum force stroke.

Luc,


Yes, you are exactly right about this.  In order to achieve maximum output the input magnet has to come to a complete stop and wait for the output magnet to finish its stroke before the input magnet can move again.  And vise versa, the output magnet has to stop and wait for the input magnet to finish its stroke before it can move to achieve minimal input work.  A cam and follower(or track and follower)setup should allow us to mechanically link the input and output to create a self runner.  I will attempt to model something up to show what I am referring to. 


Regards,
Alex

[Nonlinear]

In order to achieve maximum output the input magnet has to come to a complete stop and wait for the output magnet to finish its stroke before the input magnet can move again.  And vise versa, the output magnet has to stop and wait for the input magnet to finish its stroke before it can move to achieve minimal input work. 

In a generator designed to optimally utilize all the available excess energy at arbitrary speeds of rotation yes. One has to synchronize them and allow the slider to finish the complete stroke before the rotor is moved away. But if your aim is only to produce a closed loop as proof of concept and proof of excess energy, then one can accomplish the task in a simpler way. If there is really 60% excess energy, then the following device should be at least self running.

The proposed operation is this (referring to the earlier version where force measurements were done):

1) The stroke length of the slider was already about 10 times shorter than the travel length of the rotor magnet. If you allow the slider to deliver its work even faster say 10 times faster than the speed of the rotor magnet, then the freely rotating rotor will travel only about 1/100th distance of the stroke during the movement of the slider. This is negligible, and it nicely approximates a perfectly synchronized rotor-slider. It is also possible that a slower movement of the slider would be also satisfactory. Like for example just let both slider and rotor move at the same speed. In that case the rotor would travel 1/10th of the rotor's stroke distance while the slider completes its stroke. One can calculate how much efficiency gets lost this way and find an optimum, a compromise between practicality and ideal condition.

2) The synchronous operation can be guaranteed by using a toque brake on the shaft, and keeping the RPM of the rotor at sufficiently low level, so that the slider should be able to complete the stroke before the rotor travels a significant distance away from the synchronous position. The torque developed on the brake can be measured, just like the RPM, from which one can calculate the output power.

3) A large enough flywheel will absorb and smooth out any jerky movement, and contribute to the slow synchronous operation.

4) A timing latch could be utilized (similar to the one used in old pendulum clocks) to time and synchronize the release of the slider magnets at the right moments, only slightly before the rotor completely covers the slider magnet.

5) The linear bidirectional movement of the slider can be rectified and converted to unidirectional rotation using two bicycle hubs (or similar ratchet mechanism), one on each side. One on the left side drives the flywheel while moving forward, and the other on the right side drives it while moving backwards.

6) this way a continuous rotatory movement can be sustained, with an easy and handy way of measuring the output power. No need for accelerating and decelerating the output wheel, or stroke. But it would make sense to start designing such a machine only after precise reliable measurements prove the existence of at least 20-30% of excess energy. Anything below that would make it challenging to overcome the losses, and it would have no practical significance anyway.

[gotoluc]

Luc,

Yes, you are exactly right about this.  In order to achieve maximum output the input magnet has to come to a complete stop and wait for the output magnet to finish its stroke before the input magnet can move again.  And vise versa, the output magnet has to stop and wait for the input magnet to finish its stroke before it can move to achieve minimal input work.  A cam and follower(or track and follower)setup should allow us to mechanically link the input and output to create a self runner.  I will attempt to model something up to show what I am referring to. 

Regards,
Alex

Hi Alex,

User name TinselKoala made a suggestion of using a Scotch Yoke (1st pic) to convert the linear output to rotary.
The problem with it is there's no rest time. However, I thought there could be a way to modify the Scotch Yoke to create a pause time and found a variation that does exactly that (2nd pic)   Link to animation: http://www.mekanizmalar.com/uk012.html

The same site also has an Indexing mechanism (3rd pic). Link to animation: http://www.mekanizmalar.com/four-slot-two-pin-geneva-mechanism.html
This mechanism may do what we need to turn the rotor in four segments of rotation, stop, lock and pause.

As it is my magnet rotor only has 2 sets of magnets but I could add a second set without too much work and expense to advantage of the 4 position of this indexing mechanism.

I like both of these mechanism instead of gears since I could cut them out of plywood with a router.

Food for thought

Luc

[citfta]

Hi Luc,

Great videos as always from you.  I do have a suggestion.  The Geneva drive is an ingenious device but needs to be built with very close tolerances to work properly without it wanting to hang up.  We had some CNC machines where I worked that had them as part of the automatic tool change mechanism.  I am afraid it might not work well made from plywood.  I think the modified scotch yoke would be much easier to get working properly.

Respectfully,
Carroll