ME 340 Chapter 16 Summary

ME 340 Chapter 16 Summary - load combination self-adjusts...

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Usman Ansari ME 340 – 04/30/2011 ME 340 – Chapter 16 Summary Electrical motors come as either DC or AC machines, each of which contains a rotor, a stator, and usually both field and armature windings. DC motors in common use contain brushes and commutators that reverse the connections to the armature conductors with rotation. The need for frequent maintenance of these parts is a significant disadvantage of DC motors. An advantage though is the ease with which their speed can be controlled. The speed of a motor-
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Unformatted text preview: load combination self-adjusts to the point at which the output torque of the motor equals the torque demanded by the load. On the operating characteristic, this is the intersection point of the two load lines. Field windings are usually on the stator that establish an even number of magnetic poles. The armature windings on the rotor carry currents, resulting in forces induced by the field. A commutator and a set of brushes reverse the connections to the armature conductors as they move between poles....
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