Electric Motor
Torque Of Three-Phase Induction Motor Explained
The rotating force that a motor develops is called torque. Due to the physical laws of inertia, where a body at rest tends to remain at rest, the amount of torque necessary… Read more
Mar 16, 2013 | By Edvard Csanyi
Electric Motor
Direct Starting Of Squirrel-Cage Induction Motors
The direct starting (Direct On Line, DOL) is the simplest and most cost-efficient method of starting a motor. This is assuming that the power supply can easily deliver the high starting… Read more
Feb 16, 2013 | By Edvard Csanyi
Electric Motor
How Motor Really Works?
The basic working of a motor is based on the fact that when ‘a current carrying conductor is placed in a magnetic field, it experiences a force’. If you take… Read more
Feb 08, 2013 | By Edvard Csanyi
Electric Motor
PLC Application For Speed Control of AC Motors With Variable Speed (VS) Drive
A common PLC application is the speed control of AC motors with variable speed (VS) drives. The diagram in Figure 1 shows an operator station used to manually control a… Read more
Dec 29, 2012 | By Edvard Csanyi
Electric Motor
Classes, Speed Control and Starting of DC motors
D.C. motors are divided into three classes, as follows: series-wound motor, shunt-wound motor and compound-wound motor. Let’s take a word about each of motor class. In this type (Figure 1)… Read more
Dec 04, 2012 | By Edvard Csanyi
Electric Motor
Stator Overheating Protection
All motors need protection against overheating resulting from overload, stalled rotor, or unbalanced stator currents. For complete protection, three-phase motors should have an overload element in each phase. This is… Read more
Nov 19, 2012 | By Edvard Csanyi
Electric Motor
Few Words About Synchronous Machines
There are two main types of synchronous machine: cylindrical rotor and salient pole. In general, the former is confined to 2 and 4 pole turbine generators, while salient pole types… Read more
Nov 06, 2012 | By Edvard Csanyi
Electric Motor
Motors for Hazardous Areas
Electrical drives/motors that are operated in hazardous areas must be built and engineered so that they cannot become an ignition source. This applies not only to normal operating and starting, but also… Read more
Nov 02, 2012 | By Edvard Csanyi
Electric Motor
Industrial Applications of Brushless Servomotor
A synchronous machine with permanent magnets on the rotor is the heart of the modern brushless servomotor drive. The motor stays in synchronism with the frequency of supply, though there… Read more
Oct 26, 2012 | By Edvard Csanyi
Electric Motor
Few Words About Three-Phase Alternator
The three-phase alternator, as the name implies, has three single-phase windings spaced such that the voltage induced in any one phase is displaced by 120º from the other two. A… Read more
Oct 20, 2012 | By Edvard Csanyi
Electric Motor
LT / Medium / HT VFD Used In the Industry (part 2)
Consider the application of a drive to a cane milling unit where the speed is to be variable from full to half rated speed. The drive is to be capable… Read more
Sep 11, 2012 | By sprabakar22
Electric Motor
LT / Medium / HT VFD Used In the Industry (1)
In modern plants, there are number of drives like Milling Plant Drive, Hydraulic Drive, DC Motor Drive and AC Motor Drive of adequate capacities are available. There is lot of… Read more
Sep 10, 2012 | By sprabakar22
Electric Motor
Motor protection depending on size and voltage level
Motor protections vary widely depending on the size of the motor and voltage level involved, thus only the more common ones are discussed in this technical article. Index Motor Instantaneous… Read more
Aug 30, 2012 | By Edvard Csanyi
Electric Motor
Basics of 3-phase Induction Motor (part 4)
When a motor is expected to operate in unfavorable conditions such as: Intermittent overloading Higher ambient temperatures A restricted temperature rise as for a spinning mill, A refinery or a… Read more
Aug 07, 2012 | By Asif Eqbal
Electric Motor
Basics of 3-phase Induction Motor (part 3)
Continued fro second part – Basics of 3-phase Induction Motor (part 2) Technical data to be specified by purchaser before purchasing a 3 phase induction motor: No. Technical data to… Read more
Aug 03, 2012 | By Asif Eqbal
