Solving RC Car Motor Problem - Get Expert Help

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Discussion Overview

The discussion revolves around troubleshooting an RC car motor problem, specifically focusing on issues related to motor performance and electrical components. Participants explore potential causes for the motor's intermittent operation, including the impact of a motor replacement and the role of capacitors and voltage regulators.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant describes the RC car's specifications and the issue of the motor running with interruptions, mentioning attempts to add capacitors without success.
  • Another participant explains the purpose of the capacitors in reducing voltage spikes and electrical noise, suggesting that diagnosing the problem may require swapping components like the motor controller and receiver.
  • A participant notes that the only change made was replacing the original motor with a larger one, questioning whether the receiving unit or voltage regulators might be faulty.
  • There is a mention of the motor's performance being affected by touching the antenna, leading to a query about grounding the antenna.
  • One reply advises against grounding the antenna and suggests that the motor may be drawing excessive current or voltage, prompting questions about the motor controller's specifications.

Areas of Agreement / Disagreement

Participants express differing views on the source of the problem, with some attributing it to the new motor and others considering the possibility of issues with the receiving unit or voltage regulators. No consensus is reached on the exact cause of the motor's interruptions.

Contextual Notes

Participants mention various components and their interactions, but there are unresolved questions regarding the specifications of the motor controller and the effects of the motor replacement. The discussion includes assumptions about the functionality of the receiving unit and the implications of grounding the antenna.

Who May Find This Useful

This discussion may be useful for hobbyists and engineers interested in troubleshooting RC car electronics, particularly those dealing with motor performance issues and electrical component interactions.

RAHIL008
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hi,
I have a RC car that uses 27mhz radio frequency and 8v power supply.
The motor(6v,possibly)that rotates the wheels runs with interruptions,i have tried
adding two new 0.1Microfarad capacitors(ceramic)in the same way as they were from the manufacturer, bit it didnt help,maybe the polarity matters.
I can't figure out the problem,please help
thanks
 
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The purpose of the capacitors is to reduce voltage spikes that feed back into the motor controller, also reducing electrical noise that might effect all connnected electrical components, including the receiver. Each capacitor should be connected to one of the leads and the can of the motor, using the can of the motor similar to a common ground reference.

It would be difficult to diagnose the problem without swapping components, such as the motor controller (ESC), receiver, ... . Assuming the car also has servos for steering, do they move smoothly or do they jitter?

Did the RC car operate without interruptions before, and if so, what has changed?

Running a "6 volt motor" at 8 volts might be pushing it, although most "6 volt" motors can handle 7.2 volts.
 
Last edited:
thanks, but thing is that previously there used to be a smaller motor and replaced it with a bigger one, that's the only thing that has changed.

but I don't htink the problem is with motor, even if I conect a bulb instead of motor it also
blinks and does not light continuosly.

Is the whole receiving unit faulty?
may be the VOLTAGE REGULATORS are not working properly, if yes, then how to trace which one?

But thers one thing, when i touch the antenna, the motor stops jittering.
Would grounding the antenna help? and how to ground it?
 
You don't want to ground your antenna.

If the only component changed was the motor, and now you have a failure condition, then it's mostly likely a problem caused by the motor, such as excessive current or voltage being drawn by the motor. What size motor is your car's motor controller rated for?
 

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