Electric Motor
Comparison of motor speed control methods
It is often desirable to control the motor speed, usually for reasons process control for such variables as flow or pressure. Such applications as fans and pumps often have varying output requirements, and control of the motor speed is more… Read more
Mar 13, 2015 | By Edvard Csanyi
Electric Motor
When to Buy Premium Efficiency Motors?
Using premium efficiency motors can reduce your operating costs in several ways. Not only does saving energy reduce your monthly electrical bill, it can postpone or eliminate the need to expand the electrical supply system capacity within your facility. On a larger scale, installing efficiency… Read more
Dec 31, 2014 | By Edvard Csanyi
Electric Motor
PLC Implementation Of Forward/Reverse Motor Circuit With Interlocking
Figure 1 illustrates a hardwired forward/reverse motor circuit with electrical and push button interlockings. Figure 2 shows the simplified wiring diagram for this motor. The PLC implementation of this circuit should include the use of the overload contacts to monitor… Read more
Dec 10, 2014 | By Edvard Csanyi
Electric Motor
Characteristics And Work Principles of Switched Reluctance (SR) Motor
The Switched Reluctance (SR) motor is very different from the other polyphase machines described because both the stator and the rotor have salient poles. The motor can only be used in conjunction with its specific power converter and control, and… Read more
Dec 08, 2014 | By Edvard Csanyi
Industrial Automation
Automation Migration Strategy in 3 Phases
Owing to competitive pressures in the marketplace, a company often needs to introduce a new product in the shortest possible time. The easiest and least expensive way to accomplish this objective is to design a manual production method, using a… Read more
Oct 27, 2014 | By Edvard Csanyi
Electric Motor
14 energy-efficiency improvement opportunities in pumping systems
Pump systems consist of pumps, driver, pipe installation and controls (such as ASDs or throttles) and are a part of the overall motor system. Below some of the energy efficiency opportunities for the pumping system are presented. Also, American Society… Read more
Oct 13, 2014 | By Edvard Csanyi
Industrial Automation
10 Things to Consider When Selecting a High Quality Medium Voltage Drive
Medium voltage drives have been available for over 35 years, but have only recently achieved very high reliability and simplicity within the past few years. Below are 10 considerations on how I would go about specifying and selecting a very… Read more
Sep 17, 2014 | By Craig Hartman
Electric Motor
Selecting AC induction motors for cement plant applications
This technical article relies on the great paper written by Barton J. Sauer (Siemens Energy & Automation) which goes into essence of selecting the proper AC motor for cement plant applications. Although motors may appear to be the least complicated component… Read more
Jun 18, 2014 | By Edvard Csanyi
Electric Motor
PLC application for reduced voltage-start motor control
Figure 1 shown below illustrates the control circuit and wiring diagram of a 65% tapped, autotransformer, reduced-voltage-start motor control circuit. This reduced voltage start minimizes the inrush current at the start of the motor (locked rotor current) to 42% of that… Read more
Jun 04, 2014 | By Edvard Csanyi
Industrial Automation
Effects of Speed Variation on Rotodynamic Pumps
A rotodynamic pump is a dynamic device with the head generated by a rotating impeller. Thus, there is a relationship between impeller peripheral velocity and generated head. Peripheral velocity is directly related to shaft rotational speed, for a fixed impeller… Read more
May 09, 2014 | By Edvard Csanyi
Industrial Automation
10 Strategies for Automation and Production Systems
Following the USA Principle is a good first step in any automation project. The USA Principle is a common sense approach to automation projects. Similar procedures have been suggested in the manufacturing and automation trade literature, but none has a… Read more
May 07, 2014 | By Edvard Csanyi
Industrial Automation
Purpose and Working Principle of Inductive Sensors
Inductive sensors use currents induced by magnetic fields to detect nearby metal objects. The inductive sensor uses a coil (an inductor) to generate a high frequency magnetic field as shown in Figure 1 below. If there is a metal object… Read more
Apr 28, 2014 | By Edvard Csanyi
Industrial Automation
PLC implementation of the bottle-filling application
In this example (see Figure 1), we will implement a control program that detects the position of a bottle via a limit switch, waits 0.5 seconds, and then fills the bottle until a photosensor detects a filled condition. After the… Read more
Mar 28, 2014 | By Edvard Csanyi
Industrial Automation
Let’s start learning the PLC programming
For managing and control of the electrical systems there once were used electromechanical relays. In time as technology advanced came and PLC devices (Programable Logics Controllers). Advantage of an PLC devices over relays is that they can be used for a… Read more
Mar 17, 2014 | By Vlada Markovic
Electric Motor
Motor Starting via Chokes or Resistors
The series-connected chokes (Figure 1) or resistors (Figure 2) reduce the voltage at the motor and hence also the starting current. The starting torque is reduced by around the square of the current. At rest the motor impedance is small…. Read more
Mar 07, 2014 | By Edvard Csanyi
