Machine Overview. Please answer the following questions. Note: this is to test y

Question

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: a. Name the two winding types for synchronous and dc machines b. Identify which type of winding is used to control torque c. Of the winding types, which is wound on the stator? DC Machine: Synchronous Machine: Considering the combined air gap MMF for the following machines, indicate which rotating MMF and which has stationary MMF d. DC Machine: Synchronous Machine: Induction Motor: machines the roles of armature MMF and field MMF Also, for the DC and Synchronous easily distinguished. The interaction be ded is referred to as achine type does the "Armature Reaction" have to largest impact on the resultant air tween these two fields as the machine is "Armature Reaction". Of these two machine types in which are loa MMF and how would that be manifested in the equivalent electrical circuit? gap

Explanation / Answer

a) The two winding types for synchronous and DC machines are

i) Field Winding

ii) Armature winding

- Lap winding or

- Wave winding

b) Field winding is used to control the torque.

c)

DC Machine : Field windings

Synchronous Machine : Armature winding

d)

DC Machine - Stationary wrt to poles

Synchronous Machine - Rotating MMF

Induction motors - Single phase has stationary MMF

- 3 phase has rotating MMF.

The synchronous machine Armature reaction has largest impact on the resultant air gap MMF.

In synchronous machine, armature reaction can reduce the main field flux, with lagging power factor load(E will be larger than V), and can increase the main field flux with leading power factor load (i.e, E will be lesser than V).

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