Understanding Capacitors in RC Cars - Demson

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    Capacitors Cars Rc
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Discussion Overview

The discussion centers around the role of capacitors in remote-controlled (RC) cars, particularly in relation to their function in filtering noise and protecting components. Participants explore the specific applications of capacitors in the context of electric motors and motor controllers.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants propose that capacitors are used to filter out high-frequency noise generated by the motor, which may interfere with the radio signals.
  • One participant suggests that the capacitors also serve to eliminate voltage spikes during motor commutation, which could potentially damage the motor controller.
  • Another participant notes that the black box in the diagram is likely a motor controller or a battery eliminator controller (BEC), rather than an RC receiver.
  • There is a discussion about the configuration of capacitors, with some participants questioning the necessity of multiple capacitors and their arrangement in relation to the motor leads and casing.
  • Concerns are raised about the effectiveness of RC receivers in handling electrical noise, with some suggesting that modern receivers have good internal filtering capabilities.

Areas of Agreement / Disagreement

Participants express varying views on the specific functions and configurations of capacitors in RC cars, indicating that multiple competing perspectives remain without a clear consensus.

Contextual Notes

Some assumptions about the specific types of capacitors and their configurations are not fully explored, and the discussion does not resolve the extent of noise interference or the effectiveness of different capacitor arrangements.

Demson
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i dismantled a Remote controlled car for its parts and i saw on the electric motor some small capacitors.

thats a diagram

CIRCUT.png


i know what a capacitor is but in this instance what is its actual purpose?

help me please

Cheers Demson
 
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It is used to filter out high frequency noise generated by the motor which may interfere with the radio. Read about capacitors in AC circuits.
 
jasc15 said:
It is used to filter out high frequency noise generated by the motor which may interfere with the radio. Read about capacitors in AC circuits.



thanks that is exactly what i need thanks
 
The black box shown in the diagram is not a RC receiver, but instead a motor controller. It may also be a BEC (battery eliminator controller) that outputs a reduced voltage to the actual receiver. Also the typical case is a single motor.

There can be up to 3 capacitors, one between the leads, and one between each lead and the shell of the motor (giving a "ground" reference to the motor case), although with each lead connected to the case, I don't see the point of a 3rd capacitor hooked up between the leads, unless the goal was to use 3 smaller capacitors instead of 2 larger ones.

The main purpose of the capacitors is to eliminate the voltage spikes which occur as the motor commutates, since those voltage spikes can damage the motor controller, which are generally too small (to keep weight down) to include internal capacitors. The electical noise is also an issue that would interfere with the receiver, but I don't know how much of an issue the noise would be, since rc receivers have good internal filtering and flaw handling, along with spread spectrum usage in newer receivers.
 

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