3 STAGE JOHNSON RING COUNTER PRODUCING STEPPER WAVE FORM

Bldc tester

video:

good.. nice efforts..

More videos:

 

direct testing of cd rom motor - no esc - no digital circuits......

Mubarak.. how much load it can carry.. and whats about the RPM..? please..

translating the above youtube video description :

" Incredible speed, some 12000 RPM or more!, All with only 12 volts direct without ESC, or digital circuits. "

Sorry roopesh ji, i am not an expert in this area......

nice..

I am motivated to go deeper into its working after watching this video...

Alok.. its too happy to see many creative ideas here..

brushless to brushed....
innovative....

Respected members, i am very great full to your valuable help.   I modified my circuit as shown in the  above video. I also reworked my motor with some very thin copper wire from a transformer. this should provide me with very lesser kv rating. I replaced the 3 - tip31c transistors with one tip3055 and two 2n3055 which was lying around. This time i got lucky and the motor produces some sort of a sound(No movement at all). As i turned my variable resistor the frequency of the sound reduced and each step is heard clearly.
This is evident in the below video :

http://www.youtube.com/watch?v=zLErTg6KIjY&feature=youtu.be

nice..

 Good evening, distinguished members of the forum.

I have been carrying on with this experiment. The results was same with a reworked motor(50 turns of 30swg copper wire). I suppose the problem lies with the transistors. I could not find tip31c. Please suggest me with ideal combination of  transistors for max power.        

Reduce the turn with thick wire.

More turn = less current and more back emf while starts rotating so low torque.
Try 8-10 turn of 22-26 SWG wire per pole / phase.

Waiting for your test result.

Same result with 9 turns of 24 swg copper wire.

Quote from: KALYANPRODHAN on June 04, 2012, 10:52:09 PM
Reduce the turn with thick wire.

More turn = less current and more back emf while starts rotating so low torque.
Try 8-10 turn of 22-26 SWG wire per pole / phase.

Waiting for your test result.

Kalyan

He says the motor does not turn at all. So less turns/more torque are really academic, don't you think?

Flyback diodes are missing in the schematic in first post. With a inductive load like a motor, that means instant death of the transistor. Do check if your transistors are still in working condition and add the diodes.

It should move like a stepper motor at low frequencies. However there is no back emf at low speeds so, the current is only limited by the power supply and resistance of the motor winding. Add a resistor between motor and Vm to limit the current to what your power supply can supply. Also watch out for transistors overheating since you don't have any heatsink.