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--CATEGORY-- General Information General Electric General Nitro HPI Savage Losi LST Sportwerks Mayhem Traxxas E. Rustler Traxxas E. Stampede Traxxas N. Rustler Traxxas N. Stampede Traxxas E-Maxx Traxxas T-Maxx Traxxas Revo --ARTICLE-- Batteries Chargers Deans Plugs Dynamite ESC ESC's Motor Maintenance Motor Timing Motor Terminology Motor Wiring RPM Charts Snow/Water Proofing Super Brain Fix Tekin Electronics Wiring Adapters |
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Electronic Speed ControllersHow an ESC WorksAn ESC doesn't give the motor a certain voltage depending upon how much you pull the trigger. It actually switches power transistors, or FETs, on and off at varying speeds to simulate different voltage levels. Imagine a light switch being turned on and off over and over again. This is what's going on inside your ESC hundreds or thousands of times a second. For an explanation of that refer to the following diagrams. The first diagram shows a 6-cell pack supplying power to an ESC and motor when the throttle is wide open. Notice the steady source of power as indicated by the graph. This is what you would expect to see in this situation, and should come as no surprise to most people.
 This shows the same 6-cell pack and ESC sending no power to the motor when no throttle is being used. Notice the steady lack of power as indicated by the graph. Once again this is what you would expect to see in this situation, and should come as no surprise to most people.
 Now this is a graph of an ESC supplying around 3 volts to a motor, which would be close to half throttle. Notice the graph shows pulses that vary from the full 7.2 volts to off. This is the FETs in the ESC switching on and off to simulate the lower voltage.
 These three graphs clearly illustrate how an ESC operates by switching the FET's or transistors on and off. In real time this is performed many times a second. At lower speeds, on many ESC's, you will often hear a hum or a whine. On those ESC's you are actually hearing the switching I am referring to, and the sound is part of the normal operation. The speed at which the switching is done, is the frequency of the ESC. This is why an ESC with a higher frequency will give you better throttle control. I should point out that these diagrams are actually of a simulated ESC, but they show the results in a cleaner more simplified way than an actual ESC would. An actual ESC results would be very similar in nature and have the same overall results. You can see that in the example below.
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