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ammarabbasi
Joined: 31 May 2008
Posts: 4
Location: Lahore
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 31 May 2008 23:06 DC 12V MOTOR CONTROL . FWD , REV , SPEED CTRL ..... MODIFIED |
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THIS CIRCUIT CAN BE USED IN HOBBY VEHICALS . THESE 5 CONTROLS ARE DONE BY SIMPLE MEANS.
FORWARD .
REVERSE.
BRAKE.
SPEED CONTROL.
4WD.
PLEASE FEEL FREE TO SUGGEST. [/img][/b]
MODIFICATION : SHORT CIRCUIT REMOVED.CONNECTED ACROSS FIRST MOTOR.
Last edited by ammarabbasi on 13 Jun 2008 3:36; edited 2 times in total |
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FvM
Joined: 22 Jan 2008
Posts: 2488
Helped: 409
Location: Bochum, Germany
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| 31 May 2008 23:53 Re: DC 12V MOTOR CONTROL . FWD , REV , SPEED CTRL , 4WD , BR |
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| Surprizing operation of the brake control!
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crazyduck
Joined: 03 Sep 2001
Posts: 274
Helped: 5
Location: France
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| 01 Jun 2008 10:33 Re: DC 12V MOTOR CONTROL . FWD , REV , SPEED CTRL , 4WD , BR |
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Hi,
Very strange braking solution !!!
It's looks like battery's short-circuit. Be careful with this solution your accumulators can explose.
CD:D
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KMoffett
Joined: 11 Feb 2008
Posts: 42
Helped: 5
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| 01 Jun 2008 16:59 DC 12V MOTOR CONTROL . FWD , REV , SPEED CTRL , 4WD , BRAKE. |
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ammarabbasi,
Move the wires on the break pushbutton so it's across the motor terminals...not the battery terminals. For better long term life for your pushbuttion, add a low ohm/high wattage resistor in series with one of the pushbutton wires. In the Fisher-Price Power Wheels (http://www.modifiedpowerwheels.com/forum/) they use a 0.47 ohm/10 watt resistor. This limits the breaking current, saving the switch contacts, and provides more gentle breaking action. The higher the resistance, the slower the breaking action...the lower the resistance, the more abrupt the breaking.
Ken
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ammarabbasi
Joined: 31 May 2008
Posts: 4
Location: Lahore
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| 01 Jun 2008 18:28 Re: DC 12V MOTOR CONTROL . FWD , REV , SPEED CTRL , 4WD , BR |
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Thank you buddies .
Added after 4 minutes:
i also want to add an other motor for steering function . i think a PWM motor with pulse . i any body got some idea . please help me out.
thanks
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KMoffett
Joined: 11 Feb 2008
Posts: 42
Helped: 5
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| 01 Jun 2008 19:47 Re: DC 12V MOTOR CONTROL . FWD , REV , SPEED CTRL , 4WD , BR |
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ammarabbasi,
Another problem I see is that unless your switch(s) have a center-off position, power is "always" being applied to the motor(s). But, this may be what you are showing in the lower left picture. A DPDT relay will not replace a DPDT-center-off switch.
As for steering, are you making a remot control device?
Ken
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aristiadi
Joined: 28 May 2008
Posts: 2
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| 02 Jun 2008 1:24 Re: DC 12V MOTOR CONTROL . FWD , REV , SPEED CTRL , 4WD , BR |
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| WOW THE EXTREEEEEMMM BRAKE OPERATION, if you use more then 1 AH battery, your cable will burn so quick,
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crazyduck
Joined: 03 Sep 2001
Posts: 274
Helped: 5
Location: France
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| 02 Jun 2008 15:25 Re: DC 12V MOTOR CONTROL . FWD , REV , SPEED CTRL , 4WD , BR |
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Hi,
For little power you can use integrated Hbridge (L292; L298; LMD18200).
This circuits contain current measure and braking command.
CD:D
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pranam77
Joined: 22 Apr 2008
Posts: 84
Helped: 6
Location: The heaven
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| 12 Jun 2008 10:03 Re: DC 12V MOTOR CONTROL . FWD , REV , SPEED CTRL , 4WD , BR |
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thanks for the correction done in the schematic.
Last edited by pranam77 on 13 Jun 2008 13:48; edited 1 time in total |
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ammarabbasi
Joined: 31 May 2008
Posts: 4
Location: Lahore
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| 13 Jun 2008 1:11 Re: DC 12V MOTOR CONTROL . FWD , REV , SPEED CTRL , 4WD , BR |
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NEW INVENTION ! NEW BATTERY RETHER 
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