Simple & Powerful PWM Motor Speed Control Circuit For eBike/eScooter Project
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- čas přidán 24. 07. 2024
- A simple and cheap PWM motor control circuit using discrete components. For use in my eBike project.
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By using PNP transistors instead of NPN transistors, you still have the resistors to pull the signal down again. What difference does it make to have a low impedance pull-up and high impedance pull-down, like you have now, compared to the other way around (e.g. the NPN solution) when driving MOSFETs? And when driving a load, can't you just connect the load to the positive supply and your output instead of using PNP transistors?
As explained in the video, on the right of the circuit the motor can be driven directly from one of the flip-flop transistors, thus not requiring any additional transistors with this configuration. At the start of the video, you will see that the circuit can be configured in many ways the first two configurations actually described in the video are driving with a BC327 transistor directly from the flip-flop circuity and a TIP147 darlington driver directly from the flip-flop.
Would you mind to share the single mosfet circuit ;) i would like to try it
The current limiting part of this circuit will be an op-amp to rectify the current supply. This is also part of my PSU projects, which are further down my list of things at the moment.
hello thank you soo for sharing
can you please explain I am an absolute beginner
what is the value of R6 IN THE LAST CIRCUIT DIAGRAM AT 13:41
and where the connection J4 and J5 go
what I understand isJ1 fOR the battery/power supply and J2 to the motor and I think J3 is for controlling small load if wanted
THANK YOU SO
For R6, Zener diodes have a data sheet, which state what the minimum current required to generate the specified voltage for the zener diode is. So depending on the specification of the zener diode you are using R6 needs to be selected to consume at least the minimum current required to achieve the voltage for the mosfet transistors. J1 supply voltage, J2 output for driving from mosfets, J3 output for driving from bipolar or darlinton.
@@DevelopIT thank you so much for taking the time to explain
the connections that still confuses me is J4 and J5 are they connected to something or just the potentiometer legs connected to R2 and R3 and the ground
thanks a million
@@spark2957 RV1 is on the PCB, however it can be left off and use these connectors to go to an external variable resistor.
@@DevelopITthank you so much that makes sense
I just finished gathering the component I need
it's for the homemade metal lathe that I'm making and and ill-made video and let you if you like to see it
thankyou
@@spark2957Hi,
Have you completed your project . How much watt motor you are using.
Hi, I need to drive a 110 volts 100 amps motor. Any chance of getting a pwm circuit diagram. I will really appreciate if you can help me out
I don't have any motors like that to control myself. The first thing would be to select MOSFET transistors which can cope with that voltage and current, and have enough of them to cope with the starting current or put some kind of current limiting circuit inline with it.
Sir circuit diagram & component list please add
Is it true that if I want to use a pwm to control a 24 volt DC motor I have to have a 36 volt DC power supply
I think just using 24V power supply is what I would use as PWM on 100% duty cycle should be the same as driving at 24V. Some power monitoring would be required with 36V to prevent over heating the motor, it's not something I have ever done, so could not advise on over rating a motor, but I have seen several people who have.
@@DevelopIT the reason I ask is on Amazon, I was looking at pwm's and noticed this in the description of a couple of them.....
"【Note 1】: The power of the input power supply must be greater than 1.5 times the rated power of the motor to make the motor work (note: the input voltage and the rated voltage of the motor must be consistent). "
@@olheghtt When they say the input voltage and rated voltage must be consistent, it sounds like they are saying the voltage needs to be the same. But the amount of power the power supply can deliver needs to be greater, so the amp rating of the battery needs to be 50% more than the rating of the motor to allow for surge demand requirement on the motor starting to turn maybe?
@@DevelopIT Well, maybe I got lucky then I hope, this is what I have:
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Mean Well LRS-350-24 DC Switching Power Supply, 24V 14.6A 350W
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Motor Controller, DROK PWM DC Motor Speed Controller 10-50V 60A High Power HHO RC Driver PWM Controller Module 12V 24V 48V 3000W Extension Cord with Switch
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Type of motor: DC, Brush at 24V: - no-loading speed: 3500 rpm - loading speed:2400-2700 rpm - Max current: 8.9 amps - 150 Watts.
What I see from the scope display..the timebase is set @ 20 mSec... & pulses are at approx. same repetition rate..I infer that pwm frequency is around 100 Hz.... which I.M.H.O. is way too low..
This is one reason the motor draws such a high starting current...i.e. @ low duty cycles
the motor current cannot build up.. before the next pwm pulse.
since it is initially @ standstill..
there's no B.E.M.F. & injected current rapidly freewheels..and fall to a low value..
From the motor data sheets ,
or by measurements ..if you have the means.., determine the
" R" & " L" of the motor...to find the( L/R) time
constant ( in mSec or uSec/..) the PWM repetition rate for flip-flop should be minimum 5 times higher..better still 10-15
times....for best it is normal to have a pwm frequency above audible range (>18-20)kHz.....
This should bring your starting current down to just 2-5 times rated continuous current.. besides starting the motor quickly.
The downside is you HAVE TO USE faster b.j.t.'s or MOSFETs...and adequate heatsinking as switching losses will increase the device heating...
Sorry to say this but that fan is not spinning at 13000 rpm. The displayed 6500 rpm are a bit more realistic(still way to fast for the amount of noise), but considering your statement that it rotates twice as fast as shown, it is most definitely spinning at 3250 rpm. So you mixed it up, it’s not twice as fast, but half as fast.
Hi. This motor is MY1016 if Im not wrong and I just blew my PWM by this motor. Can you send me the circuit diagram of this PWM? I can also pay you for the PWM itself if yoi dont mind building one for me. You may choose your price tag.
I haven't got the time to build stuff for people currently, sorry. I think the full circuit is shown in the video. Currently I don't really have any spare time.
Sir circuit diagram& coponent list add
wrong motor wiring ..just saying..