Hello and a happy Christmas to all.
I was going to fit a maxon either 1017 or 1025 to a quite heavy white metal loco I am finishing, but I read that ( Nigel Lawton) that ironless core motors do not generate enough back EMF for this feature to function on DCC control. Does anyone out there have any experience of this???
Regards
Norman
There may be issues but not for the reasons you give. It is more a matter of choosing a DCC decoder suited to coreless motors. I suspect most new designs will be suitable and the thing to look for in them is high frequency PWM. "Silent" DCC decoders (i.e. PWM frequencies above human hearing) is a keyword to look for. Maxon motors are almost certainly designed with PWM and BEMF control in mind as it is so widely found in the variety of applications and industries they supply: https://www.maxonmotor.co.uk/maxon/view/content/index (https://www.maxonmotor.co.uk/maxon/view/content/index)
A motor generates Back EMF because motors are also generators (a wire moving in a magnetic field produces a voltage). Coreless motors differ from iron cored ones in that they have lower inductance (inductance can be thought of as resulting in an electronic equivalent of a flywheel). An iron cored motor evens out the pulses generated by mains frequency pulsed or low frequency PWM speed controllers meaning that it "sees" an averaged smoothed out current whereas a coreless motor responds to the individual "kicks" of current from the pulses and this can cause problems. It can also confuse the BEMF circuitry.
Thanks for that Graeme, I am a novice to this electronic stuff, and your reply was most helpful
Have a Happy Christmas.
Best wishes
Norman