When a squirrel cage motor is used at locations with high humidity (outside or maritime environment), most of them have a standstill heater inside. However I've seen motors without a built-in standstill heating but they where heated by automatically applying 24V to 2 phases when the motor is...
- Is there a rule of thumb for the ideal roughness of a commutator surface for DC-machines? I've found an explanation that was really helpful and they indicate ideal values (Ra 0,8 - 1,2 and Rz 5-8µm)
My question: Isn't this value depending by the size of the commutator? Is the ideal roughness...
I've learned from a senior electrician how to set a neutral point for a DC-motor. Later, I heard from another technician that this method is not so accurate and therefore I would like ask if this method is correct.
1) Isolate the brushes from the commutator by inserting insulation paper between...
Is there an easy way to calculate the effective charge of a battery? For example a 7,2 Ah UPS battery. When I connect a resistor, is the voltage drop an indicator of the charge level or do I need the voltage drop rate in function of time?
Is there a formula to calculate this?
Thanks
Hello,
I'm trying to understand something for already a long time but I can't really find the answer. I've been looking in many books and websites but everytime I find diagrams that are very theoretical and for me not understandable
It's about compound motors, I would like to know the...
