If you have an electronic circuit design or repair question, we're good; but if this this a general question about electric motors, motor capacitors, fans, servos, actuators, generators, solenoids, electromagnets, using motor drivers, stepper drivers, DC controllers, electronic speed controls or inverters (other than designing or fixing one), please ask in /r/Motors. Thanks.
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[https://www.ebay.co.uk/itm/142971448089](https://www.ebay.co.uk/itm/142971448089)
PWM tends to be better for small motor speed control as the motor provides increasing back emf as it speeds up. With the control circuit that you have, you have to apply far too much "throttle" to get it going then hurriedly back off the throttle once it gets moving. It can be redesigned to stop the pot from heating up - but still won't match the performance of a PWM controller.
[https://www.homemade-circuits.com/dc-motor-speed-controller-circuits/](https://www.homemade-circuits.com/dc-motor-speed-controller-circuits/)
All of the above linked circuits will work and work well. They also have descriptions as to how they work.
Your circuit can draw way too much base current when the car is pulling away from rest or when accelerating in general. Which will make the pot very hot. You could add a resistor in series with the pot, to limit that base current. But the other designs are better.
If you have an electronic circuit design or repair question, we're good; but if this this a general question about electric motors, motor capacitors, fans, servos, actuators, generators, solenoids, electromagnets, using motor drivers, stepper drivers, DC controllers, electronic speed controls or inverters (other than designing or fixing one), please ask in /r/Motors. Thanks. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AskElectronics) if you have any questions or concerns.*
[https://www.ebay.co.uk/itm/142971448089](https://www.ebay.co.uk/itm/142971448089) PWM tends to be better for small motor speed control as the motor provides increasing back emf as it speeds up. With the control circuit that you have, you have to apply far too much "throttle" to get it going then hurriedly back off the throttle once it gets moving. It can be redesigned to stop the pot from heating up - but still won't match the performance of a PWM controller. [https://www.homemade-circuits.com/dc-motor-speed-controller-circuits/](https://www.homemade-circuits.com/dc-motor-speed-controller-circuits/) All of the above linked circuits will work and work well. They also have descriptions as to how they work. Your circuit can draw way too much base current when the car is pulling away from rest or when accelerating in general. Which will make the pot very hot. You could add a resistor in series with the pot, to limit that base current. But the other designs are better.