Archive: Category «Electric Motor»

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Selection of Induction Motors for Industrial Applications (part 1)

All types of industries are invariably required to install different types of electric motors as prime mover for driving process equipment participating in their respective production line up. The continuous… Read more

May 03, 2013 | Ashok Parikh

How to determine motor torque and speed requirements

The desired speed range may be difficult to achieve depending on the type of application. In general, depending on motor size and load type, very wide ranges may require a… Read more

Mar 29, 2013 | Edvard

Induction motor startup and losses calculation

The main objectives while starting an induction motor are: To handle high-starting current To achieve high-starting torque. As we know, rotor resistance determines starting torque. Usually, this rotor resistance is small,… Read more

Mar 25, 2013 | Edvard

Starting Motor With Auto-transformer

An auto-transformer starter makes it possible to start squirrel-cage induction motors with reduced starting current, as the voltage across the motor is reduced during starting. In contrast to the star-delta… Read more

Mar 18, 2013 | Edvard

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 | Edvard

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 | Edvard

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 | Edvard

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 | Edvard

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 | Edvard

Stator Overheating Protection

All motors need protection against overheating resulting from overload, stalled rotor, or unbalanced stator currents. Consequently, to be sure that there will be an overload element in the most heavily… Read more

Nov 19, 2012 | Edvard

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