Torque in Electrical Machines — Lesson 4

This lesson covers the fundamental concepts of torque in electrical machines. It delves into the relationship between the stator field and rotor field, and how their interaction results in the creation of torque. The lesson explains how the speed of the rotor field is determined and how it affects the torque. It also discusses the concept of rotor frequency and how it is influenced by the relative speed between the stator and rotor. The lesson further explores the impact of rotor current on the creation of a rotating field. Towards the end, the lesson introduces the concept of electromagnetic torque and explains how it is developed in a machine.

Video Highlights

01:01 - Explanation of the stator field and rotor field
03:26 - Understanding the impact of rotor current on the creation of a rotating field
04:05 - Discussion on the speed of the rotor field
15:03 - Explanation of the concept of electromagnetic torque

Key Takeaways

- The speed of the rotor field is determined by the frequency of the rotor current.
- The rotor current plays a crucial role in creating a rotating field.
- The stator field and rotor field rotate at the same speed, resulting in a constant angle between them.
- The electromagnetic torque in a machine is developed due to the interaction between the stator field and rotor field.
- The torque in electrical machines can be understood better by studying the relationship between the stator field, rotor field, and rotor current.