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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › OK, What Radiation Comes from an ESC, question mark
01-14-2013 04:22 AM  7 years ago
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icanfly

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ontario

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OK, What Radiation Comes from an ESC, question mark
You know how heat bends light, and when a battery is discharging it heats up, as does a motor that by nature is tapping into heat and magnetic forces. Heat and magnetism warp the path of electron waves and patterns, sometimes inhaling them completely.

It's known as INTERFERENCE.

Their effect, batt and motor, on rx reception is understood, however, radiation emitted from an ESC is something I'd like to hear an opinion on.

What side of the esc emits more radiation, if any, compared to the other, say the fet side with heat sink as opposed to the processor side?

Any clue?
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01-14-2013 04:51 AM  7 years ago
MNNightflyer

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Minneapolis, MN USA

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It emits a low level of Gamma radiation... It hasn't effected me much, at least not when I'm calm, but if you tick me off, beware, I get big, and turn green.
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01-14-2013 04:53 AM  7 years ago
dkshema

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Cedar Rapids, IA

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Emissions are minimal, you do need to consider conducted emissions on the cable between the ESC and receiver, however. Noise here can mess with the digital electronics inside almost all receivers these days. Use the toroid supplied with your ESC on that cable, it will take care of common mode noise that can mess with your receiver through its power inputs.

The heat sink, if any, is aluminum and that won't do much to attenuate any radiated fields. Noise will be conducted along wires, and it will be radiated.

If your ESC includes a BEC that employs a switching regulator of some sort, there will be noise associated with the oscillator used to clock the switching, and there will be noise associated with the actual switching involved in making the BEC work. If your ESC has a linear regulator, radiated and conducted noise due to the regulator will be inconsequential.

The clock associated with the processor, as well as the noise from the processor data and control busses will be present, these should be relatively low levels, however.

The other noise maker is the motor commutation stuff -- the MOSFETS making up the H-bridge to drive the motor, and the FET drivers themselves.

No one side of the ESC will be worse than the other.

How much noise the ESC generates is a function of the circuit design, how well busses are terminated, how well the Printed Wiring Board is laid out, whether or not ground and power planes are present in the PWB stackup, as well as how well bypassed the digital circuits happen to be.

The motor commutating stuff has to be the worst offender, due to the large currents involved, the switching speed, and how well the design handles turning the FETS on and off.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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01-14-2013 04:54 AM  7 years ago
dkshema

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Cedar Rapids, IA

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MNNight...make sure your wardrobe contains a lot of Spandex...-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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01-14-2013 05:20 AM  7 years ago
MNNightflyer

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Minneapolis, MN USA

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MNNight...make sure your wardrobe contains a lot of Spandex...
Sorry, I couldn't resist. :P
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