Steady-state DC currents superimposed on AC power systems produce waveform distortion and 4th harmonics. This occurs as transformer and motor lamina becomes saturated at the crest of each alternate half-cycle. Multi-grounded neutral networks are subject to stray DC where electric railways...
Have others encountered difficulty with cracking of sintered ceramic magnets in fractional HP permanent magnet motors? Do these cracks grow with time, and can they produce loose chunks that will jam the armature?
The magnets in question are epoxy bonded to the inside of a heavy gage steel...
Concerning small, dry-type step-down transformers in the 1-10KVA range, manufacturer's specs indicate that output voltage is reduced by about 15% when used as a step-up transformer. Why would a transformer having a nominal 4:1 ratio produce only 408V under full load instead of 480V with 120V on...
I’m in search of a simple answer to a complex issue – an expression of the transfer function that describes conversion of amps to torque in a DC motor.
As background information, I am comparing the performance of two types of 1-HP DC motors that operate at a nominal 24 VDC. The wound field...
I have a five dollar bet with a co-worker on the correct answer to this question, so please give it your best!
Here’s the scenario: A small (about 1 HP) 120 VDC permanent magnet motor drives a reversible mechanism that imposes a varying mechanical load. The 120 VDC source is a simple...
