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« Reply #25 on: May 11, 2012, 08:39:13 PM »
mubarakmohd123
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3 STAGE JOHNSON RING COUNTER PRODUCING STEPPER WAVE FORM
cd 4017 jhonson ring.jpg
Re: brushless motor from hdd
* cd 4017 jhonson ring.jpg (33.79 KB, 540x417 - viewed 4579 times.)
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« Reply #26 on: May 22, 2012, 07:00:22 PM »
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Bldc tester

video:
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« Reply #27 on: May 23, 2012, 10:42:58 AM »
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good.. nice efforts.. Clap
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« Reply #28 on: May 25, 2012, 07:48:20 PM »
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More videos:
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« Reply #29 on: May 25, 2012, 08:11:38 PM »
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HYDRO PLANER.....
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« Reply #30 on: May 25, 2012, 08:13:02 PM »
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direct testing of cd rom motor - no esc - no digital circuits......
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« Reply #31 on: May 25, 2012, 09:11:00 PM »
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Mubarak.. how much load it can carry.. and whats about the RPM..? please.. Clap
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« Reply #32 on: May 25, 2012, 09:26:53 PM »
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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......
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« Reply #33 on: May 25, 2012, 10:02:44 PM »
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« Reply #34 on: May 26, 2012, 12:55:32 AM »
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DIY For Life!
I am motivated to go deeper into its working after watching this video... Grin
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12 Volt Madness....!!!
 

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« Reply #35 on: May 26, 2012, 11:36:27 AM »
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« Reply #36 on: May 26, 2012, 03:46:34 PM »
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brushless to brushed....
innovative....
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« Reply #37 on: May 30, 2012, 08:04:04 PM »
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Respected members, i am very great full to your valuable help.  Bow Salute 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
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« Reply #38 on: May 30, 2012, 08:23:57 PM »
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« Reply #39 on: June 04, 2012, 06:41:55 PM »
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 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.        
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« Reply #40 on: June 04, 2012, 10:52:09 PM »
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Information sharing improves knowledge of both.
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.
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« Reply #41 on: June 07, 2012, 07:25:37 PM »
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Same result with 9 turns of 24 swg copper wire.
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« Reply #42 on: June 07, 2012, 08:43:45 PM »
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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?
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« Reply #43 on: June 07, 2012, 10:35:29 PM »
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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.
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