1 / 15

Learning Outcome

EEE1012 Introduction to Electrical & Electronics Engineering Chapter 8: Magnetism by Muhazam Mustapha, October 2010. Learning Outcome. Be able to utilize and understand the concepts and formula of magnetism Be able to utilize and understand some of the processes and formula of electromechanics.

aretha-anthony
Download Presentation

Learning Outcome

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. EEE1012Introduction to Electrical &Electronics EngineeringChapter 8: Magnetismby Muhazam Mustapha, October 2010

  2. Learning Outcome • Be able to utilize and understand the concepts and formula of magnetism • Be able to utilize and understand some of the processes and formula of electromechanics By the end of this chapter students are expected to:

  3. Chapter Content • Units and Formula of Magnetism • Units and Formula of Electromechanical Systems

  4. Magnetism

  5. Magnetism • Magnetism is a phenomenon that comes alongside electrodynamic phenomenon • Moving electrons are known to have spin that is theoretized to cause magnetism • The current (opposite of electron) flow causes magnetic field to form circularly according to right hand grip • Current is in thumb direction • Magnetic field direction is the fingers direction

  6. Magnetism • Right hand grip rule:

  7. Magnetism • Right hand grip rule:

  8. Magnetic Flux • Magnetic flux is the imaginary entity that is considered to form magnetism • The direction of magnetic flux is the direction of compass aligned with the flux (from magnetic north pole to south pole) • Units and symbols: • Magnetic Flux: Ф, Wb (Weber) • Magnetic Flux Density: B, Wb/m2 or T (Tesla) • Magnetic Flux Intensity: H, A/m

  9. Magnetic Flux

  10. Magnetic Flux • Relationship: If flux density is constant

  11. Ampere’s Law Statement: Integral of vector magnetic field intensity H around a closed path is equal to the total current inside the path If the direction of the closed loop is the same as the field direction

  12. Ampere’s Law • For a single conductor flowing a current of i, this reduces to: Integration along circular path centered at the conductor; same direction as the flux

  13. Basic of Electromechanical Energy Conversion

  14. Lorenz’s Force Law • For motor action: f = il×B • If the vectors l and B are perpendicular, f = Bli • Right hand rule: f = mechanical forcei = currentl = conductor lengthB = flux density Force Current Flux

  15. Lorenz’s Force Law • For generator action: e = Blv e = voltagev = conductor speedl = conductor lengthB = flux density

More Related