Understanding DC Machine Armature Winding-2 — Lesson 7

This lesson covers the intriguing aspect of DC machine armature winding. It explains the concept of armature winding, its complexity, and its interesting nature. The lesson discusses how the armature winding is connected in series and how the winding is called lap winding due to the arrangement of the coils. It further explains how the induced voltage in the rotor coils is used to run the generator coils. The lesson also delves into the concept of polarity of induced voltage and how to convert alternating voltages into direct current. The lesson uses the example of a 16 coil DC machine to illustrate these concepts.

Video Highlights

02:48 - Discussion on the series connection of the coils
06:41 - Discussion on the process of getting DC voltage from the AC voltage
19:17 - Discussion on the placement of carbon brushes to get DC voltage
23:46 - Explanation of the process of tapping voltage from the junctions
29:26 - Discussion on the movement of the junctions and the stationary nature of the brushes

Key Takeaways

• The armature winding in a DC machine is connected in series and is referred to as lap winding due to the arrangement of the coils.
• The induced voltage in the rotor coils is used to run the generator coils.
• The polarity of the induced voltage is determined by the position of the coil in relation to the stator field.
• Alternating voltages can be converted into direct current by identifying the positive and negative junctions in the coil and connecting them appropriately.
• The example of a 16 coil DC machine provides a practical understanding of these concepts.