Induced Voltage and Magnetic Flux in Rotating Machines — Lesson 3

This lesson covers the concept of induced voltage in rotating machines. It explains the difference between electrical and mechanical degrees and their relationship. The lesson further delves into the sinusoidal distribution of magnetic fields and how it affects the induced AC voltage in a coil. It also discusses the concept of coil span and its importance in the generation of induced voltage. The lesson then provides a detailed explanation of how to calculate the induced voltage in a multi-turn coil and how to express this voltage in terms of flux per pole. An example of this is given through the derivation of the expression for the induced voltage in a coil.

Video Highlights

00:27 - Explanation of electrical and mechanical degrees and their relationship
02:33 - Explanation of coil span and its importance
05:36 - Calculation of induced voltage in a multi-turn coil
12:08 - Expression of induced voltage in terms of flux per pole

Key Takeaways

- The induced voltage in a rotating machine is influenced by the sinusoidal distribution of the magnetic field.
- The coil span, which should ideally be equal to 180 degrees electrical, plays a crucial role in the generation of induced voltage.
- The induced voltage in a multi-turn coil can be calculated using the formula 2N*BMax*sin(Theta*L*V), where N is the number of turns, BMax is the maximum magnetic flux density, L is the active length of the coil, and V is the velocity.
- The induced voltage can also be expressed in terms of flux per pole, which simplifies the expression and makes it similar to that of a transformer.