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hi
This is muralidhar.i am planing to create an electrical bike for that
i am planing to use a dc motor
(12V) but i don't no how to control the speed of that motor since it
is a DC supply i cant use transformers. I have little knowledge about
DC supply because i am electrical engineer EEE
now i am in IT field so i don't have clear idea.
can any one help me what are the simple way to vary DC voltage with
some digram which can be made in home .(the thing is i should handle 4
to 6A current)
or
any other solution to control the speed of that motor
please send me mail on below address
id:admin.murli@gmail.com
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Author: Phil AllisonDate: 05:47 26-08-08
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<admin.murli@gmail.com
>
> This is muralidhar.i am planing to create an electrical bike for that
> i am planing to use a dc motor
> (12V) but i don't no how to control the speed of that motor since it
> is a DC supply i cant use transformers. I have little knowledge about
> DC supply because i am electrical engineer EEE
> now i am in IT field so i don't have clear idea.
** Give this man a prize for his honesty.
In the words of America's most famous living philosopher:
" A man's gotta know his limitations ... "
.... Phil
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Author: Bob MastaDate: 09:23 26-08-08
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On Tue, 26 Aug 2008 00:25:24 -0700 (PDT), admin.murli@gmail.com wrote:
>hi
>
>This is muralidhar.i am planing to create an electrical bike for that
>i am planing to use a dc motor
>(12V) but i don't no how to control the speed of that motor since it
>is a DC supply i cant use transformers. I have little knowledge about
>DC supply because i am electrical engineer EEE
>now i am in IT field so i don't have clear idea.
>
>
>can any one help me what are the simple way to vary DC voltage with
>some digram which can be made in home .(the thing is i should handle 4
>to 6A current)
>or
>any other solution to control the speed of that motor
>
Google for "pulse width modulation" (PWM). The idea is that the DC from the
battery is sent to the motor in pulses, but at a very high rate so the motion
seems smooth. You control the speed by controlling the "duty cycle", which is
the percent of time the pulse is actually on.
Since you are new to this, I strongly suggest you invest in a prototype board
that allows you to plug in components and test your circuit before you actually
hard-wire it. Start by getting the PWM circuit to work, maybe watching the
waveform on a scope. Then use it to control something like the brightness of a
small light bulb or LED, then try a small motor, before you finally get up to
the actual bike motor. Each stage of this process requires bigger
current-handling ability... bigger output devices, bigger heat sinks, bigger
$$$, and more smoke if/when you screw up. Go slow!
Best regards,
Bob Masta
DAQARTA v4.00
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
FREE Signal Generator
Science with your sound card!
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Author: Tom BiasiDate: 13:14 26-08-08
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<admin.murli@gmail.com> wrote in message
news:9b022749-22df-4e20-a585-ca2f649c8692@n38g2000prl.googlegroups.com...
> hi
>
> This is muralidhar.i am planing to create an electrical bike for that
> i am planing to use a dc motor
> (12V) but i don't no how to control the speed of that motor since it
> is a DC supply i cant use transformers. I have little knowledge about
> DC supply because i am electrical engineer EEE
> now i am in IT field so i don't have clear idea.
>
>
> can any one help me what are the simple way to vary DC voltage with
> some digram which can be made in home .(the thing is i should handle 4
> to 6A current)
> or
> any other solution to control the speed of that motor
>
> please send me mail on below address
>
> id:admin.murli@gmail.com
What Phil is saying to you is that this is not a beginner project.
You will be controlling some heavy current and the cost will not be cheap.
One suggestion would be to bank your batteries and tap different voltages.
You will lose torque at reduced voltage but it can work.
May I suggest a different approach?
Get a geared motor and turn your pedal sprocket at your normal pedal pace
and use the bikes gears.
Good Luck,
Tom
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On Aug 26, 3:47=A0am, "Phil Allison" <philalli...@tpg.com.au> wrote:
> <admin.mu...@gmail.com
>
>
>
> > This is muralidhar.i am planing to create an electrical bike for that
> > i am planing to use a dc motor
> > (12V) but i don't no how to control the speed of that motor since it
> > is a DC supply i cant use transformers. I have little knowledge about
> > DC supply because i am electrical engineer =A0EEE
> > now i am in IT field so i don't have clear idea.
>
> ** Give this man a prize for his honesty.
>
> In the words of America's most famous living philosopher:
>
> " A man's gotta know his limitations =A0... =A0"
>
> .... =A0 Phil
Please do tell me - who is America's most famous living philosopher
who can be credited with saying that first? Tim Allen?
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Author: Phil AllisonDate: 23:15 26-08-08
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<melee5@my-deja.com>
<admin.murli@gmail.com
>
> This is muralidhar.i am planing to create an electrical bike for that
> i am planing to use a dc motor
> (12V) but i don't no how to control the speed of that motor since it
> is a DC supply i cant use transformers. I have little knowledge about
> DC supply because i am electrical engineer EEE
> now i am in IT field so i don't have clear idea.
>
> ** Give this man a prize for his honesty.
>
> In the words of America's most famous living philosopher:
>
> " A man's gotta know his limitations ... "
>
Please do tell me - who is America's most famous living philosopher
who can be credited with saying that first? Tim Allen?
** Hardly.
The comment is from a famous movie released in 1973.
Allen was still in school or jail back then.
..... Phil
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Author: Tom BiasiDate: 10:15 27-08-08
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"Phil Allison" <philallison@tpg.com.au> wrote in message
news:6hjv6iFmdo3lU1@mid.individual.net...
>
> <melee5@my-deja.com>
> <admin.murli@gmail.com
>>
>> This is muralidhar.i am planing to create an electrical bike for that
>> i am planing to use a dc motor
>> (12V) but i don't no how to control the speed of that motor since it
>> is a DC supply i cant use transformers. I have little knowledge about
>> DC supply because i am electrical engineer EEE
>> now i am in IT field so i don't have clear idea.
>>
>> ** Give this man a prize for his honesty.
>>
>> In the words of America's most famous living philosopher:
>>
>> " A man's gotta know his limitations ... "
>>
>
>
> Please do tell me - who is America's most famous living philosopher
> who can be credited with saying that first? Tim Allen?
>
> ** Hardly.
>
> The comment is from a famous movie released in 1973.
>
> Allen was still in school or jail back then.
>
>
>
>
> ..... Phil
>
One of my favorites Phil. The cable company is running his movies all this
week. G,B& U yesterday, Fistfull of Dollars today.
Tom
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Author: bwDate: 01:33 28-08-08
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"Tom Biasi" <tombiasi@optonline.net> wrote in message
news:48b56204$0$7323$607ed4bc@cv.net...
> One of my favorites Phil. The cable company is running his movies all this
> week. G,B& U yesterday, Fistfull of Dollars today.
>
> Tom
G, B and U is one of the all-time greats.
Simple story, nice cinematography, nice sound, good characters and Eli
Wallach. Very few flaws, such as the commander of the union force in the
battle scene.
I've seen it countless times and it's always a fun time.
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