X1. The magnetic strength of the field poles on a permanent magnet DC motor cannot be varied. a) true b) false X2. The________ of a permanent magnet DC motor can be changed. a) speed b) direction of rotation c) both "a" and "b" d) neither "a" nor "b" X3. A "printed-circuit motor" is another term for a_________ motor. a) DC servo-disc b) DC servomotor c) DC brushless d) none of the above

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Winding and Constructions

Alternating Current (AC) winding is generally of the 3-phase type due to the inherent advantages of the 3-phase machine. Armature coils must be connected to the yield balance (equivalent in magnitude and 2/3 of the series phase difference of the rod) 3-phase electromotive forces (emf). The armature should be divided into step-bands to start with slots around the perimeter.In the construction of AC machines, the frame is used as an external protective shield to protect it from environmental conditions. The frame also serves as the outer perimeter, allowing the interior to be easily placed. The static state section of the devices is the stator winding attached stator.