MH's ideal coil and voltage question

[tinman]

Really?

The CEMF of an inductor causes the current to increase from a minimum after T=0

The BEMF of a motor causes the current to decrease from a maximum after T=0 (as the motor's RPM increases)

PW

Yes,i know that. I stated that in my video.

But what is the difference as far as the mechanism go's?,in that, as the motor speeds up,the magnetic fields change in time increases,and the current decreases.
With the inductor,the fastest rate of change in time for the magnetic field ,is at T=0-the moment a voltage is placed across the inductor.
In both cases,it comes down to the rate of change of the magnetic field in time,only as i stated in my video,this change in time with the motor to that of the inductor is ass about--but the mechanism is still the same.

In saying that,do you know for sure that the PMs in a DC motor have any effect what so ever to the BackEMF value?.
Well we will soon find out,as i can measure this BackEMF value very accurately--i have found a way to do it


Brad

[hoptoad]

The fat lady sings.

Does she dance too? 
Cheers

[tinman]

Mmm-interesting.

A question for you all.

Regarding the BackEMF in a DC PM motor,such as the ones i am using in the previous video.
Is the bulk of the BackEMF a result of the PMs,or a result of the rising and falling current in the rotor winding's ?

I will await a day or two,before i post my video showing the result's.

MH-->what do you think?


Brad

[ltseung888]

Mmm-interesting.

A question for you all.

Regarding the BackEMF in a DC PM motor,such as the ones i am using in the previous video.
Is the bulk of the BackEMF a result of the PMs,or a result of the rising and falling current in the rotor winding's ?

I will await a day or two,before i post my video showing the result's.

MH-->what do you think?


Brad

display the waveforms on a DSO.  use a single coil to pulse...  a 5V DC pulse can produce a sharp negative voltage of over 580v.  the current as indicated on the DSO can still be positive.


This will have huge implications on the design of Pulse Motors.

[tinman]

display the waveforms on a DSO.  use a single coil to pulse...  a 5V DC pulse can produce a sharp negative voltage of over 580v.  the current as indicated on the DSO can still be positive.


This will have huge implications on the design of Pulse Motors.

How about you do it instead,and post your results on your own thread.

We all know about inductive kickback-or flyback,and that has nothing to do with the discussion ATM.
What is so great about the voltage inverting across an inductor,when the current flow is interupted?.


Brad