2006-09-21 04:19:21 · 4 answers · asked by CIBUMOL B 1 in Science & Mathematics ➔ Engineering
A direct current (dc) motor is nothing more than an alternating current (ac) motor with a commutator. It is far more efficient to electronically convert dc to ac to drive an ac motor than to use a dc motor for high power applications.
- An old electric power engineer.
2006-09-21 04:42:15 · answer #1 · answered by Deep Thought 5 · 1⤊ 0⤋
Certainly a DC motor made of superconductors is possible. It's true the motor itself wouldn't be superconducting when doing work, but it would be 100% efficient since there is no resistive loss. As many DC motor designs do, it would generate a back EMF when rotating. The power source would have to overcome this EMF when providing current. (Thus there would be no free lunch.) Such a motor is described in the reference.
EDIT: I have to disagree with a statement in the answer following this one. A DC motor is not simply an AC motor with a commutator; it has a DC stator field. AC motors have a rotating stator field.
2006-09-21 11:38:39 · answer #2 · answered by kirchwey 7 · 0⤊ 0⤋
Hi. A superconducting DC motor would not be able to do any work or it would not superconduct. Check this out: http://www.ga.com/atg/homo.php It's about the superconducting DC homopolar motor. Always a solution I guess.
2006-09-21 11:22:40 · answer #3 · answered by Cirric 7 · 0⤊ 0⤋
Its so simple AC is cheap.
2006-09-21 11:29:19 · answer #4 · answered by hemu_ma2001 2 · 0⤊ 0⤋