Lord Geordie Posted March 19, 2008 Report Share Posted March 19, 2008 Righty!!! I am currently making a pigeon magnet with a 6v motor and gearbox and the revolutions are still too fast and I am searching for a 6v speed controler but can only find 12v ones? Does anyone know of a 6v speed controler OR someone who supplies the above? The reason I went for the 6v motor is it's a danm sight lighter than the 12v counterpart and also a LOT cheaper as they are in all the kiddies electric quads so I know they are powerful enough for the intended purpose! I could insert a resistor in line to the motor to reduce the voltage but this in turn is not adjustable so I am stuck with one speed but was ALSO considering a Variable resistor but these drain the battery faster than a dedicated speed controler Any help with the predicament would be greatly appreciated! Thanks LG Quote Link to comment Share on other sites More sharing options...
bob300w Posted March 19, 2008 Report Share Posted March 19, 2008 (edited) RS (Radio Spares). Edit; Found it- http://uk.rs-online.com/web/ Edited March 19, 2008 by bob300w Quote Link to comment Share on other sites More sharing options...
Lord Geordie Posted March 19, 2008 Author Report Share Posted March 19, 2008 (edited) RS (Radio Spares). Ah now I gotcha Edited March 19, 2008 by Lord Geordie Quote Link to comment Share on other sites More sharing options...
Lord Geordie Posted March 19, 2008 Author Report Share Posted March 19, 2008 Thanks Bob! Didn't get one from RS but it DID make me remember to try Maplins and I found one straight away all ready built up 6-15V for £15 Quote Link to comment Share on other sites More sharing options...
pin Posted March 19, 2008 Report Share Posted March 19, 2008 (edited) Two main types, resistive and pwm (pulse width modulated) Resistive types are cheaper, think rheostat. Disadvantage is that they use resistance to control the speed of the motor which means the current drawn is the same (or more in poor designs) as the full speed operation of the motor. Ie you can slow it down but the battery will last the same as if you had it on full whack. PWM types use logic and are more complex / expensive. Advantage is that they use a completely different approach to regulating speed. They effectively switch on and off the current to the motor at a variable rate or duty cycle. For 50% speed the motor is only powered 50% of the time, this reduces the speed whilst not sinking the rest of the current whilst the motor is off. (in practice they are obviously not 100% efficient, but this is illustrative) Maplins sell PWM motor controllers as kits and as units (as do RS sell the controllers). You should be able to find a 6v unit, if not it's reasonably trivial to substitute components to deliver nominal 6v instead of 12. Shout if you want a hand with it Edited March 19, 2008 by pin Quote Link to comment Share on other sites More sharing options...
pin Posted March 19, 2008 Report Share Posted March 19, 2008 Simple design with notes and suggested values here http://www.aaroncake.net/circuits/motorcon.asp Depending on the current draw of the motor at full tilt you'd need to select an appropriate mosfet (field effect transistor) which would be the single most costly item, around a few pounds. Quote Link to comment Share on other sites More sharing options...
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