The Robert Adams Pulse Motor Design Review

[toranarod]

Hey Rod,

today I fired the circuit with the new coils and controller. I noticed that the controller is using about 40ma of current and it is only pulsing twice per magnet pass.

You can increase the pulse count in the menu counter position.

Is it possible to upload to this controller new code? Do you have updates?

Yes I am up dating all the time.

So I am playing with the timing and I am able to trigger anywhere in the sine wave. As you mentioned on the tip of the sine wave is the best place and most efficient. I did not install the generator coils BUT I did just put them on the end of the driver coils and it does not affect the power consumption and only slow down a little bit the speed. So I guess one could use that way too to generate power.

It is running from 100ma + the 40ma of the board up to 500ma depending of the positioning of the hall-effect and if I am using the C12 cap or not. Around 100 uf seems to be the best in improving speed but still incur more power consumption.

RPM can go from 200 to 600rpm.

Funny enough with the Arduino I was able to run this at 5ma but not counting how much the board was using since it was fed by the USB power.

My scope at 25mhz is not good enough to show signals as you are posting. May be I am not putting the scope probes on the right place. When the probe is placed cross the driver coil I can see kind of like what you show BUT no way to show the full induced sine wave of the magnet passing by and the BEMF in one nice and clean scope shot. What is the trick???

Anyway I just purchased a 200mhz USB scope where I hope to get better in the measurements.

I like your view point on things and it is inspiring me to learn in how to measure and observe things better. When I played with Adams motor about 5 years ago I did not think as clear and critically as you are doing this thing so I must say THANK YOU dude for sharing and teaching.

Keep on testing

My magnets are neos with 1400 gauss measure with a Tesla meter (140 mT).

Fausto.

You can increase the pulse count in the menu counter position.

do you have the user manual I created for the unit?


I am up dating all the time

[toranarod]

I have a Transistor problem





I have made a error in regards to the value of Q1. It came to my attention there
was a loss in Hi voltage going back to the battery in one of my test circuits.

I changed MOFETS over the weekend and remembered something about there shunt load internal diode, The value of Q1. The type Of transistor used in the circuit above is wrong. IT will shut to 55 volts blocking the Hi voltage going back to the battery. I am very sorry for this mistake. I have been so focused on other
things. you will need to use this type. look up the PDF data sheet you will see it is rated at 250 volts.
IRF644PbF

[coss]

Hello all
Rod please put a photo with pulse.
Thank you and good luck

[toranarod]

from the cro

Hello all
Rod please put a photo with pulse.
Thank you and good luck

Yes of course. I assume you mean a screen shot from the scope?

[coss]

Yes Rod a screen shot from the scope.
thanks

[coss]

you tried to use in your application a tesla coils for electro-magnets?

[plengo]

I have made a error in regards to the value of Q1. It came to my attention there
was a loss in Hi voltage going back to the battery in one of my test circuits.

I changed MOFETS over the weekend and remembered something about there shunt load internal diode, The value of Q1. The type Of transistor used in the circuit above is wrong. IT will shut to 55 volts blocking the Hi voltage going back to the battery. I am very sorry for this mistake. I have been so focused on other
things. you will need to use this type. look up the PDF data sheet you will see it is rated at 250 volts.
IRF644PbF

You're so right. I was wondering why I can't get a clean scope shot since it was showing those 300v spikes no matter what. I added a diode from the coil to the battery and it improved a lot. Now, with your statement I see that you are absolutely correct.

I will change that Q1 on the board with another transistor.

Fausto.

[plengo]

You can increase the pulse count in the menu counter position.

do you have the user manual I created for the unit?


I am up dating all the time

That menu shows the passing magnet over the hall-effect count. It does not allow me to change the number of pulses.

I read and re-read the manual and could not find anywhere how to program that. Aside from that the rest of the programming is great. It changes the pulses duty cycle and the frequency great.

Fausto.

[toranarod]

That menu shows the passing magnet over the hall-effect count. It does not allow me to change the number of pulses.

I read and re-read the manual and could not find anywhere how to program that. Aside from that the rest of the programming is great. It changes the pulses duty cycle and the frequency great.

Fausto.

I think I am not understanding your request. I will help you. We need to fix this.

[plengo]

I think I am not understanding your request. I will help you. We need to fix this.

What I am saying is that you have 3 menus:

1) allows you to turn on the PWM as the hall-effect sences it and/or make it a steady PWM independent of the hall-effect

2) allows you to change the duty cycle and the PWM frequency

3) only shows the count of how many times a magnet activated the hall-effect. No place to CHANGE the number of pulses per activation of the hall-effect.

So it is missing a menu 4 where I could change, let's say, from 2 pulses to 10 pulses every time the small trigger magnet activates the hall-effect. No matter how long is the duty cycle it will only pulse twice.

Is it clear now?

Fausto.

[plengo]

What I am saying is that you have 3 menus:

1) allows you to turn on the PWM as the hall-effect sences it and/or make it a steady PWM independent of the hall-effect

2) allows you to change the duty cycle and the PWM frequency

3) only shows the count of how many times a magnet activated the hall-effect. No place to CHANGE the number of pulses per activation of the hall-effect.

So it is missing a menu 4 where I could change, let's say, from 2 pulses to 10 pulses every time the small trigger magnet activates the hall-effect. No matter how long is the duty cycle it will only pulse twice.

Is it clear now?

Fausto.

Rod,

Never mind my friend. My bad. Now I realized that on the menu 3 I CAN change the number of pulses by pressing 8 or 9 while 6 turns ON/OFF the count. So you're right. This is EXCELLENT.

Fausto.

[toranarod]

Rod,

Never mind my friend. My bad. Now I realized that on the menu 3 I CAN change the number of pulses by pressing 8 or 9 while 6 turns ON/OFF the count. So you're right. This is EXCELLENT.

Fausto.

Thats great. I understand. Happy it is working I was worried it may have been broken.

I am still going to put my my new Photo after spending some time creating it
I just want to post it.
It may be of help to others.

good luck



One other thing
I have updated the program over the weekend so you can advance the timing
or retard the timing with out moving the sensor. you set the sensor in the midrange position and adjust the timing up or down from the computer

it made for fine tunning and gave some reference point to take data from.

if you have a PIC programmer i can send you the new software some time.

[plengo]

Rod,

great, I do have a pic programmer for the PIC16Fxxx family. You can send to my email the new program.

Now, should I change the mosfet on the board? I noticed the board has a IRF70N06 (I think) which is only 60V. Can you confirm that this should be changed?

Fausto.

[toranarod]

Rod,

great, I do have a pic programmer for the PIC16Fxxx family. You can send to my email the new program.

Now, should I change the mosfet on the board? I noticed the board has a IRF70N06 (I think) which is only 60V. Can you confirm that this should be changed?

Fausto.

Yes It would be better to change it.

privately email me. The content is get out side the forum topic structure
i will send you the software.

[plengo]

Rod,

I sent you a private message with my email.

I also figured that removing the display it will save about 30 ma of power consumption (so simple and I never thought of it until today ).

Fausto.