Advice on Portiscap motors

[AndyID]

1 hour ago, NIK said:

Hi,

 

The heating effect is due to the lower inductance of the coreless motor, increasing the frequency of the PWM results in the current through the motor being lowered.

Not all DCC decoders have the option for a higher frequency and putting a flywheel on the motor has little effect on coreless motor heating.

 

Regards

 

Nick

 

Hi Nick,

 

The thing that limits the current isn't a motor's inductance. It's the back EMF produced in the windings as they rotate in the magnetic field. The inductance is lower if you measure it with the rotor removed but in operation the windings are in a magnetic field just as they are with a cored motor. Coreless motors effectively have a "core" (a magnetic circuit) too. The difference is it does not rotate.

 

Cheers,

Andy