8528-1:2005 - Reciprocating internal combustion engine driven alternating current generating sets -- Part 1: Application, ratings and performance. Electric motors and generators. Electric motors, generators, alternators and loudspeakers are explained using animations and schematics. This is a resource page from Physclips, a multi-level multimedia introduction to physics (download the animations on this page).
DC motors A simple DC motor has a coil of wire that can rotate in a magnetic field. The current in the coil is supplied via two brushes that make moving contact with a split ring. The coil lies in a steady magnetic field. The force F on a wire of length L carrying a current i in a magnetic field B is iLB times the sine of the angle between B and i, which would be 90° if the field were uniformly vertical. Note the effect of the brushes on the split ring. The torque generated over a cycle varies with the vertical separation of the two forces.
Motors and generators Now a DC motor is also a DC generator. Emf = − dφ/dt = − (d/dt) (NBA cos θ) = NBA sin θ (dθ/dt) = NBAω sin ωt. The animation above would be called a DC generator. An alternator This is an AC generator. How real electric motors work. How real electric motors work John Storey Note: These pages are intended to be read in conjunction with Joe's "Electric motors and generators" pages of the HSC Physics resources. Read those pages first. Once you've got the basic idea and understand the physical principles and the maths, you're ready to explore how real-life engineers have put physics into action to make our lives easier. When it comes down to it, all these motor are using the same basic principle. If you're tempted to pull a motor apart yourself, please think carefully about the risks involved before reaching for the tool kit. Click on any picture for a high-resolution image.
You can download this entire document as a 2.3 MB PDF file , or read individual sections by following the links. How a Generator Works. Inertia Constant H. Direct Axis Quadrature Axis.pdf (application/pdf Object) Reactive power capability chart. Reactive Power Capability Chart. Principles od Synchronise Machines.pdf (application/pdf Object) Salient Pole Construction. Direct Axis and Quadrature Axis Syncronise Reactance. Reliability Tutorials. +ve, -ve & zero sequence. Generator and Exciter Basics. Generator Basics - Power Point.
Electric motors and generators.