Question

1. Machine Overview. Please answer the following questions. Note: this is to test your comprehension of the basic concepts covered in class. For a DC Machine and Synchronous Machine: Name the two winding types for synchronous and de machines a. Identify which type of winding is used to control torque b. Of the winding types, which is wound on the stator? c. DC Machine: Synchronous Machine: nsidering the combined air gap MMF for the following machines, indicate which has rotating MMF and which has stationary MMF d. Co DC Machine: Synchronous Machine: Induction Motor: lso, for the DC and Synchronous machines the roles of armature MMF and field Also, niy distinguished. The interaction between these two fields as the machine is are eed i referred to as "Armature Reaction. Of these two machine types in which chine type does the "Armature Reaction" have to largest impact on the resultant air MMF and how would that be manifested in the equivalent electrical circuit? gap What is the displacement angle between the MMFs produced by the two windings identified in (a) that results in maximum torque per ampere and what is the physical mechanism in DC machine construction that enables this relationship to be true (4 points)? e. t. If Ea>Va is the DC or Synchronous machine operating as a motor or a generator (4 points)? A 12 pole induction motor has an applied frequency of 50 Hz and a slip of 6 percent. What is the mechanical speed? B-

Answer 1

a) winding → windin D Mathin windn eld windin onstont load nTno

んi entika wilt α.umy