Electric Motor
Major difference between a 2-phase and a 3-phase stator
For purposes of explaining rotor movement, let’s assume that we can place a bar magnet in the center of the stator diagrams of figure 0. We’ll mount this magnet so… Read more
Dec 17, 2011 | By Edvard
Electric Motor
5 steps to choose the best motor for your application
For line-operated motors, loads fall into three general categories: constant torque, torque that changes abruptly, and torque that change gradually over time. Bulk material conveyors, extruders, positive displacement pumps, and… Read more
Dec 03, 2011 | By Edvard
Electric Motor
Why do we need variable speed drives (VSD)?
There are many and diverse reasons for using variable speed drives. Some applications, such as paper making machines, cannot run without them while others, such as centrifugal pumps, can benefit… Read more
Nov 25, 2011 | By Edvard
Electric Motor
Motors And Drives For Efficient Control – ABB
With electric motors accounting for an estimated 65 percent of industrial energy use, any increases in efficiency clearly provide the potential for major savings. The energy consumption of electric motors… Read more
Nov 23, 2011 | By Edvard
Electric Motor
DC motor and generator – design, application and operation
History will recognize the vital role played by DC motors in the development of industrial power transmission systems, the dc machine being the first practical device to convert electrical power… Read more
Nov 06, 2011 | By Edvard
Electric Motor
Cooling and Ventilation of Electric Motors (IC)
All rotating electrical machines generate heat as a result of the electrical and mechanical losses inside the machine. Losses are high during starting or dynamic braking. Also, losses usually increase… Read more
Aug 08, 2011 | By Edvard
Electric Motor
AC motors – Protection against short circuits
Every electric motor has operating limits. Overshooting these limits will eventually destroy it and the systems it drives, the immediate effect being operating shutdown and losses. A short circuit is… Read more
Jul 29, 2011 | By Edvard
Electric Motor
Basic construction of 3-phase AC induction motors you should know
For industrial and mining applications, 3-phase AC induction motors are the prime movers for the vast majority of machines. These motors can be operated either directly from the mains or… Read more
Apr 18, 2011 | By Edvard
Electric Motor
VSD – Power supply connections and earthing
In accordance with accepted practice and the local, power is normally provided to a VSD from a distribution board (DB) or a motor control center (MCC). Adequate arrangements should be… Read more
Apr 13, 2011 | By Edvard
Electric Motor
Induction machines – historical touch
Faraday discovered the electromagnetic induction law around 1831 and Maxwell formulated the laws of electricity (or Maxwell’s equations) around 1860. The knowledge was ripe for the invention of the induction… Read more
Mar 15, 2011 | By Edvard
Electric Motor
Operating Principle Of Three Phase Asynchronous Motors
The operating principle of an asynchronous motor involves creating an induced current in a conductor when the latter cuts off the lines of force in a magnetic field, hence the… Read more
Feb 02, 2011 | By Edvard
Electric Motor
Keeping Motor Windings Dry
Special provision should be made to protect motor windings which operate in a damp atmosphere or are subject to condensation of moisture when out of service for long periods. Motors… Read more
Dec 14, 2010 | By Edvard
