I plan to have a rotor (similar to common 205mm ID outrunner DD motor rotors) machined out of aluminium but as back iron for the magnets I need a 3-4mm thick iron ring.
When shrinking the case onto the steel ring, there would not be enough friction at high temperatures because the aluminium will expand more than the iron.
When glueing it in, heat conductivity from the inside to the outside would get worse. Not sure if thermally conductive epoxy would be suitable for this.
All components of the motor will be able to take at least 185 degrees Celsius continously, so in operation the iron ring could see temperatures of 120 degrees celsius or higher.
Statorade and cooling fins will be used.
Which method to join the iron ring with the aluminium case would you choose?
When shrinking the case onto the steel ring, there would not be enough friction at high temperatures because the aluminium will expand more than the iron.
When glueing it in, heat conductivity from the inside to the outside would get worse. Not sure if thermally conductive epoxy would be suitable for this.
All components of the motor will be able to take at least 185 degrees Celsius continously, so in operation the iron ring could see temperatures of 120 degrees celsius or higher.
Statorade and cooling fins will be used.
Which method to join the iron ring with the aluminium case would you choose?