61
Renewable Energy Q&A / Re: Max winding temp
« Last post by Pete on May 07, 2022, 09:53:06 pm »Hi LH, one other thing to check if the motor is ever apart again is the Rotor.
Squirrel cage rotors do fail.
The bars in the slots usually break at the rings that connect them together at the ends.
This causes the motor to hunt and make strange noises, they sound like they are trying to get up to speed but can't quite make it so they emit a strange humming noise as they run.
I once walked into an autoelectric shop I worked at a few years earlier. They had a 100hp motor that they could not find anything wrong with, They were just about to start chopping the stator windings out when I looked at the rotor.
The rotor had copper bars that were silver soldered to a brass ring. Sure enough some of the bars were broken.
I managed to stop the fellow with the air chisel just in time. He was just about to start chopping the stator winding up.
You could always slip some thermistors into the windings if you wanted.
Unfortunately as the controller is setup, the motor will probably just keep tripping the thermistor relays anyway.
Good luck
Pete
Squirrel cage rotors do fail.
The bars in the slots usually break at the rings that connect them together at the ends.
This causes the motor to hunt and make strange noises, they sound like they are trying to get up to speed but can't quite make it so they emit a strange humming noise as they run.
I once walked into an autoelectric shop I worked at a few years earlier. They had a 100hp motor that they could not find anything wrong with, They were just about to start chopping the stator windings out when I looked at the rotor.
The rotor had copper bars that were silver soldered to a brass ring. Sure enough some of the bars were broken.
I managed to stop the fellow with the air chisel just in time. He was just about to start chopping the stator winding up.
You could always slip some thermistors into the windings if you wanted.
Unfortunately as the controller is setup, the motor will probably just keep tripping the thermistor relays anyway.
Good luck
Pete