dc motor power-op-amp speed controller

[JesusHChrist2000]

What opamp are you using?



[Pacoelo]

Friend what do i need to buy for a electricla motor of 1 phace,can work in 2 speeds, low speeds and a high speed? the electric motor model is 189D1753P008 it is a motor from automatic washing machine (it is out of the automatic washing) thx for help me

[SHITONASTICK1100]

hmm does the resistor not create a voltage drop so less voltage gets to the motor? how does that help speed it up? cheers for video too.

[GTXAbunada]

Nice Stick!

[kd5gua]

Just in a minute I can think of all the reasons for having pic in line. It could monitor various types of feed back, limit switches, temp readings, etc., and make decisions. Most of the stuff one builds when beginning to understand circuits won't have a reason for certain aspects, or at least won't have requirement, there is a reason, learning.

[ikb01]

analouge pot is converted to digital only to be converted back to analouge?

why

[maynardr6]

@ikb01 I imagine the pic and ADC are used to better control the range of voltage to the op amp and scale the potentiometer more precisely to the input of the opamp. Just guessing though.

[idan2082i]

Thank you very much. Your explanations are great.

[hakaboza]

is there a schematic for the circuit ?

[Porcupinespecial]

SIR WHAT FULL CODE NAME FOR YOUR POTENTIONMETER YOU USE?

[MiShO10O0O]

KISS

[teerapong2020]

good



[king0685]

Just a bit small.. (larger breadboard) but great explanation.

[thrasher729]

would say a 12v drill motor have the same amount of hp as the 12v one from radioshack?

[TheError404]

Nice work, now you need PCB

[adrifromhh]

why do you need the pic? isnt this much too complicated? Why not directly sending the poti voltage to the opamp?

[klaudyuxxx]

@adrifromhh he said it in the end of the video DOH

[amartinjoe]

thanks for uploading !!

[9Barry009]

I've experiment with motor controls from the pwm side and sequence control of the magnetic flux in three phase motors, but I've never thought about controlling a motor using an op amp. The only downside to your project is that without the pic chip this would have been a purely analogue circuit which is really cool because lets face it the electronic engineer is losing ground to the computer programmer or chip designers. I'd love to see a purely analogue circuit of the same nature. Fantastic!

[VeXorian1337]

You have no idea how many problems nowadays must be solved with analog circuits.

[emactan]

You said that for the op amp the feedback resistor is 10K and input resistor  = 1K. Shouldn't you have a gain of 11 and not 1.1?

[kingdeadly1]

@emactan I completely agree

10k/1k + 1 = 11

[VFDDistributing]

Simplistic and straightforward, good explanation - thanks!

[rfhracing]

Is this basically how high power (3Kw 24vdc) motors are controlled- what would you suggest?

[rodstartube]

hey clint eastwood speaking, in the program, in the pic, you must use interrupts (in this case timer interrupts), to leave led blinking in the background without messing your real time application (in this case speed changes)

[hrvojevz]

Is this Clint Eastwood speaking? :)

[thunderhammer]

What part number is the power op amp? I've never heard of such a thing, I can only find op amps with a max current of 100mA at best. Linear regulators have an adjustable output voltage based on an input voltage, I suppose you could call that a non-inverting op-amp...

[thesouthcamera]

Cool that has given me grate advice. But can I ask you, could a similar design work with 40v DC? And is the voltage going thru the variable resister low of is it 12v too.

Just if you are interested I'm trying to make a roaming computerised robot for ruff terrain. I could easily make that variable resister work with the computer output box if the voltage is low. This is way higher in voltage and amps in your video but if it can be done this way it would help.

Thanks

[9720680]

i have a question, i have a 12v dc motor that i only want to run at about 3-4volts. what do i solder on to the back of the motor so it does not go any faster then 3-4volts? is it a transistor that i use? also, what ever it is that i need to use, it needs to stand up to 16volts. thanks! any help would be greatfull!

[Eddiev1985]

Study Ohms Law.

You need to calculate the value of the resistor you need to only allow 3 or 4 volts to go to the motor.

ex.. 17.6 VDC Supply

.02 ma LED current

5. vcd LED voltage

17.6 minus 5. divided by .02 = 630 ohm resistor.

Good luck

Eddie

[man13preet]

Hello Eddie !!!

I have a problem...I know Ohms Law..but still.....

I have a 9v supply and a 3v LED...what type of resistor is useful?

Some say 330 ohms?

BUT how???

[Eddiev1985]

Hello.

Follow this formula.

9v-3v/.02=300

Or 9volts minus 3 volts divided by .02 milliamps.

That means a 300 ohm resistor.

The .02 is the milliamp draw of a typical LED.

This formula will work with any DC voltage supply.

Not all LEDs are created equal, be sure to read the back of the package and know the voltage and milliamps.

Practice this formula with different power supply voltages and you will always get the right answer!

Eddie

[roomtek]

the whole electric car circuitry, on one breadboard!. very nice.

[technogumbo]

Great video! Your detailed explanation is greatly appreciated. Thank you for the time you took to make the video.

[me79dz]

please can you tell me in a message what he is saying. because I miss some words,and we have this as an exam. thanks

[lazzer408]

pwm is not outputting a higher and higher voltage to the motor. voltage (and current) is delivered in pulses.

[thewii552]

@lazzer408 i'm thinking that he is talking about average voltage. I agree with you though.

[icecreamdaddy]

damn nice! i could rarely get anything to work on a PIC in my electronics class...guess my code writing sucked...

[eejuice]

Nice project and good description. Is your pic code online? Thanks for showing the battery circuit too.