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motor control help? Answered

ok so first off i just cant wrap my head around this for some reason...... what im looking to do (basically) is have a "pod" turn left and right i want it to be controlled via some type of joystick. i get the mechanics but i just dont understand the electronics. i think i need some kind of pwm motor control. well i just got all the stuff to follow some of the instructables on here but i get nothing.......well i got a smoking pot? no pun intended anyway please someone help

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Re-design
Re-design

10 years ago

Do you want positional control. Like you move the stick 1/2 right and the motor rotates 1/2 right and then you move it 1/3 left and the motor rotates 1/3 left?

Or do you just want move left and the motor rotates left until you release the stick and move right and the motor rotate until you release the stick?

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dannyces
dannyces

Answer 10 years ago

hey sorry i never got an email letting me know there was answers... so yeah i would like to have positional control. but it can only go so far then it has to stop. what i am doing or what i want to do is have a light on the front of my boat that i can control left and right. i know they make ones that i can buy but i would like to make my own. and as far as size goes i am planning on using 2 small auto fog lights maybe 2" x 3" so they arent very big or heavy. Thanks for any input Danny

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Re-design
Re-design

Answer 10 years ago

Now that I know what you're doing, I would do it mechanically with a cable something like a lawnmower throttle cable. Moving the lever back and forth turns the light.

Or,

You could mount the lights on a "turntable" that uses a geared down dc motor.  To control it you use a "on-off-on" switch wired that center is off of course left moves the lights left and right moves the lights right.  instead of a turntable you could use a dc motor setup as a linear actuator that uses levers to translate linear motion to rotational motion.

I know that's not exactly what you had in mind but getting positional control is going to be difficult.  I'll have to do some thinking and research on that one.

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dannyces
dannyces

Answer 10 years ago

hey cool thanks for the reply.. so i wanna keep this as simple as possible mechanically that is. so i have a linear actator set-up and it works great but the motor spins like a bat outta hell so really i just need to slow it down and i feel like gears in this set-up would be asking for problems. anyway im just about to get my pwm motor setup working. any more input would be great and i'll keep you updated if you want?? thanks again Danny

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Re-design
Re-design

Answer 10 years ago

What voltage is and how may amps does it use?

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dannyces
dannyces

Answer 10 years ago

well i want it to run off the 12 volts from the boats battery and as far as the amps well i have no clue....did i say i really know nothing about electronics??? cuase well i know nothing about electronics. im trying to use a small dc hobby motor i had lying around if that helps

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Re-design
Re-design

Answer 10 years ago


Ah, now we're getting somewhere.

Use this motor control circuit.  Then where motor plus and minus is marked insert the reversing switch as linked here.  THis circuit shows using  a DPDT switch which has two settings.  If you subbed the same switch but one that has OFF in the middle it could serve as on/off and directional control also.  The reversing switch needs to be heavy duty as it is controlling the full power.

Now attach to your motor.  You should have a variable speed control now.  It may not go slow enough for your purposes but it might.  On very low speed you won't have a lot of torque, but maybe you will have enough to do the job.

This circuit should control up to 40 amps if you heat sink the transistors.  If you are only controlling a small motor you might only need on transistor - not all 4.

Anyway good luck and let us know how it comes out.

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dannyces
dannyces

Answer 10 years ago

awesome i will try this tonite when i get home from work.... thanks again for the help and i'll post my results Danny

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dannyces
dannyces

Answer 10 years ago

hey sorry one more question??? so would this not work???https://www.instructables.com/id/Simple-and-dirty-Pulse-Width-Modulation-PWM-Wi/ thanks again Danny

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steveastrouk
steveastrouk

10 years ago

How BIG is the thing you want to turn ?