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Few Words About Synchronous Machines
Figure 1 - Gearless synchronous generator for wind power plants developed by SIEMENSIntroduction to Synchronous MachineThere are two main types of synchronous machine: cylindrical rotor and salient...
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Stator Overheating Protection
Stator Overheating Protection (on photo bottom of the Motor Stator Winding; by electrical-forensics.com)OverheatingAll motors need protection against overheating resulting from overload, stalled...
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Classes, Speed Control and Starting of DC motors
Classes, Speed Control and Starting of DC motors (on photo: Sugarcane Mill Rolling DC Motor; 440/220VDC; 500kW; with Shunt-wound construction)DC Motor ClassesD.C. motors are divided into three...
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PLC Application For Speed Control of AC Motors With Variable Speed (VS) Drive
PLC Application For Speed Control of AC Motors With VSD (on photo: Quadplex panel that controls four total pumps, two 25HP and two 50HP pumps controlled by corresponding variable frequency drives with...
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How Motor Really Works?
Figure 1 - A motor action 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 a simple DC...
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Direct Starting Of Squirrel-Cage Induction Motors
Direct Starting Of Squirrel-Cage Induction MotorsIntroductionThe direct starting (Direct On Line, DOL) is the simplest and most cost-efficient method of starting a motor.This is assuming that the...
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Torque Of Three-Phase Induction Motor Explained
Torque Of Three-Phase Induction Motor Explained (photo by empoweringpumps.com)Introduction to torqueThe rotating force that a motor develops is called torque.Due to the physical laws of inertia, where...
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Starting Motor With Auto-transformer
Starting Motor With Auto-transformerCircuit and function An auto-transformer starter makes it possible to start squirrel-cage induction motors with reduced starting current, as the voltage across the...
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Induction Motor Startup And Losses Calculation
Induction Motor Startup And Losses (on photo: 100 HP DISCFLO Stainless Steel Pump)Main ObjectivesThe main objectives while starting an induction motor are:To handle high-starting currentTo achieve...
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How to determine motor torque & speed requirements
How to determine motor torque and speed requirementsOperating Speed RangeThe desired speed range may be difficult to achieve depending on the type of application. In general, depending on motor size...
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Selection of Induction Motors for Industrial Applications (part 1)
Selection of Induction Motors for Industrial Applications (photo by http://www.iecee.org)Introduction All types of industries are invariably required to install different types of electric motors as...
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Selection of Induction Motors for Industrial Applications (part 2)
Selection of Induction Motors for Industrial Applications (part 2) - photo by TCD Systems Continued from first part: Selection of Induction Motors for Industrial Applications (part 1) Design...
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Selection of Induction Motors for Industrial Applications (part 3)
Selection of Induction Motors for Industrial Applications (photo by ABB) Continued from first part: Selection of Induction Motors for Industrial Applications (part 2) Design Considerations...
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Three phenomenons in the iron of AC machines
Three phenomenons in the iron of AC machinesMagnetic CircuitsMost of our practical AC machines (motors, generators ad transformers) depend heavily on the magnetic field for operation. The core iron of...
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Split-phase motors for medium-duty applications
Split-phase motors for medium-duty applications (photo by MikeC5 at practicalmachinist.com)Starting winding in series with a centrifugal switch The split-phase (SP), or more accurately, the...
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Few Words About Capacitor-Start (CS) Motors
Start-run capacitor single-phase induction motor (Source ABB) The capacitor-start (CS), or more precisely, capacitor-start, induction-run motor, is a modified split-phase induction motor used for...
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Keeping Motor At Correct Temperature When Connected To a Frequency Converter
Keeping Motor At Correct Temperature When Connected To a Frequency Converter (photo by Yaconto LLC.)Two types of influenceWhen a motor is connected to a frequency converter it must be kept at the...
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What is the rewind scenario if a motor fails?
What is the rewind scenario if a motor fails? (photo by electricmotorsales.co.uk)Increasing Motor EfficencyUnlike an initial motor purchase where your decision is limited to procuring a standard versus...
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Selection Of Crane Duty Motors (Part 1)
Selection Of Crane Duty Motors (Photo By polyglot via Flickr)IntroductionThe operating conditions such as duty cycle, startup, temperature and operating environment are vital considerations in the...
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Selection Of Crane Duty Motors (Part 2)
Selection Of Crane Duty Motors (on photo: Electric wire rope hoist for LNG (liquified natural gas) - STAHL CraneSystems GmbH by DirectIndustry) Continued from first part: Selection Of Crane Duty Motors...
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