improve torque idea

[Michelinho]

@ tagor,

Yes, I am sure of that and the Newman will not be a self runner but will run with very little input.
The surface (skin) effect was studied by Tesla and others.

Take care,

Michel

[kmarinas86]

bonjour  Michel

are you sure of that ?
have you a self runner of the  Newman motor's ?

The common usage of the term back-emf shows over-simplified understanding of it.

For each circuit there is a given energy in the magnetic field that can be produced for a given current. As the current rises just after voltage is applied (i.e. when power changes), the magnetic field around the circuit quickly gets stronger. But any electrostatic potential energy in the circuit that is used in the system is simply waste. Contrary to what many people assumed through unexplict teachings, the rate of change of energy in the magnetic field is a function of applied voltage minus current*resistance.

Therefore, as current rises, not all voltage is used to produce the magnetic flux by increasing the current for the given inductance, but now some of it is used to sustain the current that heats the coil due to the resistance. That power behind that is simply the result of the depletion of electrical potential energy of like-charges (electrons) that tend to repel themselves along the circuit. That is to say, the decline in the growth rate in the magnetic field is actually due to the presence of energy drained which does not contribute at all to the magnetic field (which largely, if not completely, is dissapated as heat due to the resistance of the conducting path).

Thus, a given voltage really does produce magnetic flux, not a given current (where to produce strictly means to increase with time) . After all, the definition of voltage is the change of magnetic flux per change in time!

The magnetic flux is the magnetic field times area. Thus, to get the magnetic field B, you take voltage contributed to the magnetism of the coil integrated with respect to time and then divide by an area through which all of that magnetic flux flows through within the coil. When a changing magnetic field couples with a unchanging magnetic field such as that from permanent magnets, the energy of the magnetic field increases at a rate at first proportional the applied voltage, until the current approaches the maximum, where the energy of the magnetic field stagnated and is no longer further contributed in net by energy used by the circuit, until the applied voltage is reduced so that the cycle begin again. Thus, current and voltage must be constantly rising and falling within the circuit to produce the changes in the magnetic field required to do work. If power is constant, then the magnetic field of the coil can do no work, just as permanent magnets can do no work.

Thus, as shown in my previous post in this thread, both the power and energy you can derive from a given Newman machine is proportional to the change of power per change in time.

[ipower]

this is my new big motor with 6x6CM magnet ,tested with 400V input voltage,very fast rotation,i have no  mesure meter so i dont know speed, the current is about 3MA,and power input is 400X3=1.2W, so surprise, newman motor should very high effective,but i think its not a ou device. it just useful to lower torque low input  aera , when make load ,the current increase very fast.

just for u this reffence.

[hartiberlin]

Ipower,
can you please post a youtube video of your motor ?
How many Kg of wire do you have on your coil, what is its DC ohmical resistance  and
what current is the motor drawing, when you brake down the
rotor with your fingers ?

Many thanks.

[ipower]

Ipower,
can you please post a youtube video of your motor ?
How many Kg of wire do you have on your coil, what is its DC ohmical resistance  and
what current is the motor drawing, when you brake down the
rotor with your fingers ?

Many thanks.

i make double coils ,one to power in and another load a 10W/220v  lamp,when turn on lamp ,it light but input brush have large spit and speed down low then stop, the coil is about 600ohm, 400uf/600v capatitor can drive it 30s while turn off power input.