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Old 9th January 2007, 01:52 PM   #16
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I have a 3 horsepower 110vDC motor from a treadmill machine. That will likely require some very stout components to operate it!
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Old 30th January 2007, 10:04 AM   #17
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thanks for your advices...
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Old 15th February 2007, 04:10 PM   #18
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Quote:
Originally Posted by HiTech
I have a 3 horsepower 110vDC motor from a treadmill machine. That will likely require some very stout components to operate it!
That is exactly what they are for. Normal consumer grade stuff uses 1-2HP. The PWMs that drive it use 50A IGBTs, though the continuous current is limited to 15-25A depending on the unit.

D.
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Old 15th February 2007, 04:15 PM   #19
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Quote:
Originally Posted by ElectroMaster
Here, S1 and S2 are normally open , push to close, press button switches. The diodes can be red or green and are there only to indicate direction. You may need to alter the TIP31 transistors depending on the motor being used. Remember, running under load draws more current. This circuit was built to operate a small motor used for opening and closing a pair of curtains. As an advantage over automatic closing and opening systems, you have control of how much, or how little light to let into a room. The four diodes surriunding the motor, are back EMF diodes. They are chosen to suit the motor. For a 12V motor drawing 1amp under load, I use 1N4001 diodes.

You should just put the two LEDs anti parallel, as it stands you are breaking the unlit one down. They typically have a 5V reverse breakdown rating.

And you need to change the 1N4001s to schottkys. 1N4001s are slow diodes that are not worth anything far beyond line frequency.

D.
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Old 28th July 2007, 10:06 AM   #20
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hey its really nice to be a member...
can you help to build an driver of the step motor (8 coils), to control the direction of torque if the motor
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Old 6th October 2007, 11:16 PM   #21
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Quote:
Originally Posted by cadstarsucks
You should just put the two LEDs anti parallel, as it stands you are breaking the unlit one down. They typically have a 5V reverse breakdown rating.

And you need to change the 1N4001s to schottkys. 1N4001s are slow diodes that are not worth anything far beyond line frequency.

D.

hi am have a project to design treadmill
and i hope to know how i can do the PWM controlling by the PIC microcontoller? and if i can use the same circuit which added in ur replay
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Old 15th October 2007, 06:30 PM   #22
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that circuit is well know here in Latinoamerica... but we prefer use a PWM with el dual timer 556..
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Old 24th January 2008, 09:26 PM   #23
Default PWM circuit
Hi,

Can anyone give me the PWM circuit of CD motor control with all the component value. I was looking for the snubber circuit and the MOSFET used.

Regards,
Bency
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Old 21st February 2008, 09:27 AM   #24
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Did anyone know how i can use thyristor (SCR) as power switch to drive a 12VDC Motor and LDR to control the direction?? Please help me for my project. Thanks.
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Old 2nd May 2008, 11:27 AM   #25
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Quote:
Originally Posted by stevenlaw188
Did anyone know how i can use thyristor (SCR) as power switch to drive a 12VDC Motor and LDR to control the direction?? Please help me for my project. Thanks.
You can't, there is no way to conveniently turn it off.
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Old 2nd May 2008, 11:56 AM   #26
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Originally Posted by stevenlaw188
Did anyone know how i can use thyristor (SCR) as power switch to drive a 12VDC Motor and LDR to control the direction?? Please help me for my project. Thanks.
If you visit the Robotics Section in this site there are about 100 topics regarding line followers/ light followers.

They are using this input sensors ex:LDR & IR in their robots.Also have plenty posts regarding how to control a speed of a motor.
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Last edited by Gayan Soyza; 2nd May 2008 at 11:59 AM.
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Old 10th December 2008, 06:08 PM   #27
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thnx 4 u
it is good
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Old 20th December 2008, 10:47 AM   #28
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thanks for this
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Old 8th February 2009, 12:30 PM   #29
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Why putting such diodes on the path for the motor
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Old 8th February 2009, 12:32 PM   #30
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please I am beginner .I need wxplaination for that circuit
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