Author Topic: Decoder "Requires Possible Frame Modification, Back EMF"???  (Read 631 times)

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Kisatchie

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I'm looking at this decoder for my Kato SD40s:

http://www.digitrax.com/products/engine-matrix/decoder/

What is back EMF??? Digitrax makes several other decoders for the SD40. Should I go with one that doesn't mention back EMF?

Ahhhhh...


Hmm... I'd get a TCE
decoder...


Two scientists create a teleportation ray, and they try it out on a cricket. They put the cricket on one of the two teleportation pads in the room, and they turn the ray on.
The cricket jumps across the room onto the other pad.
"It works! It works!"

peteski

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Re: Decoder "Requires Possible Frame Modification, Back EMF"???
« Reply #1 on: July 18, 2016, 04:35:57 PM »
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BEMF is simply a techincal name and a good marketing term which describes the ability of the decoder to read back the speed and load on the motor. It is used to improve the speed control of a locomotive.

This is nothing new, exciting or to be scared of. Pretty much all decoders nowadays utilize the BEMF feedback from the motor to control its speed.

A quick Google search for BEMF DCC shows a good explanation:
http://www.dccwiki.com/Back_EMF
And more techincal info:
https://en.wikipedia.org/wiki/Counter-electromotive_force
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Kisatchie

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Re: Decoder "Requires Possible Frame Modification, Back EMF"???
« Reply #2 on: July 18, 2016, 04:43:15 PM »
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BEMF is simply a techincal name and a good marketing term which describes the ability of the decoder to read back the speed and load on the motor....
This is nothing new, exciting or to be scared of....

Thanks! Sigh, I am such an electrical dummy.


Hmm... Kiz is a dummy
in a vast assortment of
areas...


Two scientists create a teleportation ray, and they try it out on a cricket. They put the cricket on one of the two teleportation pads in the room, and they turn the ray on.
The cricket jumps across the room onto the other pad.
"It works! It works!"