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Have you ever wondered how they make all that electricity at Niagra falls or the hoover dam? Those AC generators run like 20KA and 20KV. They are also 20 feet high and 40 feet in diameter. The controls are simplest if you have a brushed or brushless permanent magnet DC motor. Just look...

Nice answers, Gunnar, especially about how motors die. I would take E max current to be an absolute limit, that is absolute maximum current. As for how many times per hour you can reach the "frequent max current", I think the rule is probably that whatever pattern of current is applied to the...

You need to learn a little Japanese/English here (grin) The key is: Frequent --> Repeated (that is, these frequent things can be done without damage to the motor. I think these things can be done for a minute at a time) The Occ torque is clearly the maximum torque before damaging the bearings...

DC Contactors are also made by www.cableform.com (full disclosure: my employer -- we have also made DC generator field controls, and solid-state DC contactors) microelettrica scientifica (what we use when the voltage gets too high) Hubble EC&M (was Schneider/Square D) (what we use when the...