Rotating Magnetic Field's and Inductors.

[tinman]

OK,Strobe test done.

In the below diagram-
Coils magnetic polarity as marked-north at the rotor end.
Sync timing as marked.
So rotor is synced to coil every south magnet,where it switches on  before south magnet gets to coil,and switches off just as south magnet has left the coil core.
So it is skipping every north magnet,and thus the RPM of the rotor is 1/4 that of the coils pulses per minute. 35Hz X 60 / 4 = 525rpm.

The on and off time include the current flow of the inductive kickback. This was achieved by putting a FWBR across the trigger coil of the bifilar wound coil to drive the strobe LED,with a 100 ohm resistor in series with the LED and FWBR-,as we only use the run coil to drive the rotor.


Brad

[picowatt]

OK,Strobe test done.

In the below diagram-
Coils magnetic polarity as marked-north at the rotor end.
Sync timing as marked.
So rotor is synced to coil every south magnet,where it switches on  before south magnet gets to coil,and switches off just as south magnet has left the coil core.
So it is skipping every north magnet,and thus the RPM of the rotor is 1/4 that of the coils pulses per minute. 35Hz X 60 / 4 = 525rpm.

The on and off time include the current flow of the inductive kickback. This was achieved by putting a FWBR across the trigger coil of the bifilar wound coil to drive the strobe LED,with a 100 ohm resistor in series with the LED and FWBR-,as we only use the run coil to drive the rotor.


Brad

Tinman,

Would you agree that the rotor is likely being accelerated at and/or during the coil on time?

PW

[tinman]

Tinman,

Would you agree that the rotor is likely being accelerated at and/or during the coil on time?

PW

Yes i would,but also during the kickback cycle,as current still flows through the coil in the same direction during the kickback cycle.<-- something to think about.


Brad

[picowatt]

Yes i would,but also during the kickback cycle,as current still flows through the coil in the same direction during the kickback cycle.<-- something to think about.


Brad

Curious...

Are you saying you believe the coil is accelerated during both the coil on time and flyback periods?

I would think that once past TDC, it would be tugging the wrong way and decelerate the rotor...

PW 

[tinman]

Curious...

Are you saying you believe the coil is accelerated during both the coil on time and flyback periods?

I would think that once past TDC, it would be tugging the wrong way and decelerate the rotor...

PW

Thinking about what you said,i went and had a look at my rotor again. So here is what i did-->i have marked the N and S to the left side of the magnets-not on top as the timing diagram looks--my mistake. I did this so as i could see the N or S in case the magnet lined up with the core when the transistor switches off--which it dose. So in actual fact,the transistor is switching of just before the magnet reaches the center of the core,and i would think the kickback current flowing through the coil would pull it to the center of the core. I will have to remove the marks i have on the rotor,and mark the center of the magnet in stead to confirm this.

But look at the two scope shots below--what do you notice about the kickback with and without the rotor?. Also lets think about what is happening here.
The coil is providing the energy to spin the rotor. The rotor in turn changes the (yet to be determined)coil in some way,and this change reduces the P/in to the coil. We know the external magnetic field has to be changing with time,as a static external field dose not alter the P/in--this we seen in the second video. So we take some of the energy out of the coil to drive the rotor-the rotor in turn reduces the P/in-all while the P/out remains the same.

In the last video,we could clearly see that without the external alternating magnetic fields of the rotor,the coil !although receiving the very same P/in at the same frequency!,dissipated much more heat than it did when the rotor was in play. We could also see that the output was less without the rotor,and this is a clear sign that the missing P/out without the rotor in play,was being dissipated as heat from the coil. So what is it that the external alternating magnetic fields do to the coil to reduce the dissipated heat from the coil,and raise the P/out from that coil. PW-this is what i mean by the magnets are converting the heat into electrical power. If the magnetic fields of the magnets on the rotor are changing the operation of the coil,so as waste heat is reduced,and electrical P/in go's down,or electrical P/out go's up,then those magnets are doing work. You cannot change anything without work being done. Even when you change your mind,work is being done by way of electrochemical signals racing around in your mind. As funny as you may think that sound's,it is true.


Brad


Brad