Electric Motor
Few Words About Stepper Motor (Advantages, Disadvantages and Classification)
A stepper motor is an electromechanical device which converts electrical pulses into discrete mechanical movements. The shaft or spindle of a stepper motor rotates in discrete step increments when electrical command pulses are applied to it in the proper sequence…. Read more
Nov 06, 2013 | By Edvard Csanyi
Electric Motor
4 motor designs identified in NEMA MG1
Performance requirements for various types of induction motors for use on standard sinewave power supplies are identified in NEMA MG1. Some of these types of motors are suitable for use in variable speed applications, dependent on the type of application…. Read more
Nov 01, 2013 | By Edvard Csanyi
Energy and Power
An Overview Of Control (Ice Cube) Relays
An electromechanical relay is an electrical switch actuated by an electromagnet coil. As switching devices, they exhibit simple “on” and “off” behavior with no intermediate states. The electronic schematic symbol for a simple single-pole, single-throw (SPST) relay is shown here:… Read more
Sep 18, 2013 | By Edvard Csanyi
Industrial Automation
Goals and Benefits of the IEC 61131 Standard (PLCs – Programmable Logic Controllers)
The five parts of the standard IEC 61131 summarise the requirements of modern PLC systems. These requirements concern the PLC hardware and the programming system. The standard includes both the common concepts already in use in PLC programming and additional… Read more
Aug 30, 2013 | By Edvard Csanyi
HVAC
Jet pumps used for private well systems or low flow irrigation applications
Jet Pumps are mounted above ground and lift the water out of the ground through a suction pipe. Jets are popular in areas with high water tables and warmer climates. There are two categories of jet pumps and pump selection… Read more
Aug 12, 2013 | By Edvard Csanyi
Electric Motor
7 Most Common Motor Enclosure Types Defined By NEMA Standards
The enclosure of the motor must protect the windings, bearings, and other mechanical parts from moisture, chemicals, mechanical damage and abrasion from grit. NEMA standards MG1-1.25 through 1.27 define more than 20 types of enclosures under the categories of open… Read more
Aug 09, 2013 | By Edvard Csanyi
Electric Motor
Motor Service Factor (SF) Defined By NEMA
Motor Service Factor (SF) is the percentage of overloading the motor can handle for short periods when operating normally within the correct voltage tolerances. This is practical as it gives you some ‘fudge’ in estimating horsepower needs and actual running… Read more
Aug 07, 2013 | By Edvard Csanyi
Electric Motor
NEMA Definition Of Motor Full Load Nominal Efficency (Standard MG1-12.54.2)
Efficiency is defined as the ratio of the power output divided by the power input. Machine losses are in the form of heat, and include: Stator winding loss, Rotor loss, Core loss (hysteresis and eddy current), Friction and windage, and… Read more
Aug 02, 2013 | By Edvard Csanyi
Electric Motor
Selection Of Crane Duty Motors (Part 3)
Continued from second part: Selection Of Crane Duty Motors (Part 2) N = Duration of motor operation under rated conditions R = Duration of motor at rest and de-energised ØMax = Maximum temperature attained during Duty cycle Unless otherwise specified,… Read more
Jul 27, 2013 | By Ashok Parikh
Electric Motor
Selection Of Crane Duty Motors (Part 2)
Continued from first part: Selection Of Crane Duty Motors (Part 1) Following two types of motors are widely used for crane duty applications. Squirrel Cage Crane Duty Motors Slip ring and Wound Rotor Crane Duty Motors The crane motors are… Read more
Jul 24, 2013 | By Ashok Parikh
Electric Motor
Selection Of Crane Duty Motors (Part 1)
The operating conditions such as duty cycle, startup, temperature and operating environment are vital considerations in the motor efficiency and reliability. It is absolutely essential to match the motors to their specified operating conditions for minimizing stresses on the motors… Read more
Jul 22, 2013 | By Ashok Parikh
Energy and Power
An Introduction To SCADA For Electrical Engineers – Beginners
It is impossible to keep control and supervision on all industrial activities manually. Some automated tool is required which can control, supervise, collect data, analyses data and generate reports. A unique solution is introduced to meet all this demand is… Read more
Jun 19, 2013 | By Bipul Raman
Industrial Automation
Requirements and Functions of Substation Automation
Substation automation is the cutting edge technology in electrical engineering. It means having an intelligent, interactive power distribution network including : Increased performance and reliability of electrical protection. Advanced disturbance and event recording capabilities, aiding in detailed electrical fault analysis…. Read more
May 17, 2013 | By Edvard Csanyi
Electric Motor
Selection of Induction Motors for Industrial Applications (part 3)
Continued from first part: Selection of Induction Motors for Industrial Applications (part 2) The different rotor class, i.e. KL7, KL10, KL13, KL16, KLp, etc. are available in case of the motor to fulfil the functional torque requirements of the driven… Read more
May 06, 2013 | By Ashok Parikh
Electric Motor
Selection of Induction Motors for Industrial Applications (part 2)
Continued from first part: Selection of Induction Motors for Industrial Applications (part 1) Though standard motors are now available with a better efficiency, this factor (motor efficency) requires due attention when making the selection of the motor for a specific… Read more
May 04, 2013 | By Ashok Parikh
