Honestly, I cannot see how a rope connected to the motor axle is going to work.
Imagine trying to pull back a car that is already running forward.
Why not simply a rope attached to a very large tension spring?

I thought about rope and spring, but it cant switch diffuculty level plus there are many more functions which springs cant offer.

 

I thought about rope and spring, but it cant switch diffuculty level plus there are many more functions which springs cant offer.

And there are more things that you motor can't do. In normal *fly* type exercises you are using both the pull and retract to strain the muscles, that is one of the things that make that type exercise so effective. With you motorized retract it won't force the muscle to keep the weight under control, and could even be dangerous if it is too fast.

 

How about a tension spring on a variable length arm adjusted by a screw thread or rack and pinion?

 

Honestly, I cannot see how a rope connected to the motor axle is going to work.
Imagine trying to pull back a car that is already running forward.
Why not simply a rope attached to a very large tension spring?

Please consider the physical size oof a spring that can stretch a whole meter and then retract. Now if it needs to provide some force, it will be big. In addition, the force to stretch a spring varies as it is stretched, while any exercise machine keeps a constant effort as required. Mechanical reality gets big and bulky sometimes.

 

while any exercise machine keeps a constant effort as required.

Which is why the best and even most expensive professional ones have used weight stacks and pulleys for over a century. And can be made very compact in their foot print.

 

The TS has an idea on how to make one delivering the same performance while being mechanically much simpler, far more adjustable, more compact, and with probably quite a few unique computerized features. Certainly a programmed servo motor could do it all, but doing it with a simpler motor and control setup would make it unique and able to be patented.

 

but doing it with a simpler motor and control setup would make it unique and able to be patented.

Like this? From back in 2011, just the first I came up with, probably many more with a few more minutes on Google. But then again maybe you and him can get together and become rich?
https://patents.justia.com/patent/20110195819

 

Just found out that Tonal is already making such machine, they also got 200 m investment. Anyway, they use magnet resistance motor.

 

"Magnet Resistance Motor" sounds a lot like an induction motor with DC applied. So it might not have patent protection. And the features that can be added by means of computer control could be what sells the product. So if there is a desire to compete, get a copy of their patent and see what features are not claimed. Those are the ones to go after.

 

"Magnet Resistance Motor" sounds a lot like an induction motor with DC applied. So it might not have patent protection. And the features that can be added by means of computer control could be what sells the product. So if there is a desire to compete, get a copy of their patent and see what features are not claimed. Those are the ones to go after.

• Magnet resistance motor set - pancake motor with torque controller attached on pancake motor, it is DC brushed motor. Existing machine is totally different from my idea in shape, applications and other things, only motor type and general use is somehow same

 

Really, an induction motor would be a better choice for long life and smoother braking. Not as linear torque to current relationship, and not as light as a pancake motor, but certainly worthwhile investigating. And it would be much farther away from the existing patents.

 

And it would be much farther away from the existing patents.

And much larger.

 

And much larger.

Sometimes marketing has shown that making some things a bit bigger sells better. Not all folks want the dinky little product, sometimes bigger is better.
And certainly there are more versions of induction motors available than pancake motor models.

It was not made clear, I don't think, as to if the TS was plannng on making one machine for personal use or actually going into production on this concept. For one individual the induction motor could be simpler, easier, and cheaper.