Electric Motor
A few tips on how to select contactors for use in direct on line starters
Contactors for use in direct on line starters (DOL) are normally selected by their AC3 rating, that is the switching on of a cage type induction motor and switching off the supply to the motor after the motor has run… Read more
May 09, 2016 | By Edvard Csanyi
Electric Motor
Every car has it – The Lundell generator with claw-pole rotor
Increasing comfort and safety in cars, trucks, and buses driven by combustion engines require more installed electric power on board. As of now, the Lundell generator (claw-pole rotor generator) is the only type of automotive generator used in industry, with total powers… Read more
May 06, 2016 | By Edvard Csanyi
Electric Motor
Two Basic Methods Used For Braking a Motor (DC Injection and Dynamic)
Two common basic methods used for braking a motor are DC injection braking and dynamic braking. We will look at both in detail, starting with electric braking. DC Injection Braking Dynamic Braking DC injection braking is a method of braking… Read more
Apr 18, 2016 | By Edvard Csanyi
Electric Motor
3 reasons for increased efficiency loss in rewound motors
Approximately 300,000 motors are rewound in the UK every year, with an average rating of about 12 kW, so the efficiency of rewound motors is extremely important. The loss in efficiency on rewinding depends on the techniques, processes and skill… Read more
Mar 07, 2016 | By Edvard Csanyi
Electric Motor
Regular Motor Maintenance To Avoid Failure (and Prolong Its Lifespan)
A well and carefully designed motor maintenance program, when correctly used, can be summed up as preventive maintenance, predictive maintenance and reactive maintenance. Inspection cycles depend upon the type of motor and the conditions under which it operates. Motors need… Read more
Feb 29, 2016 | By Edvard Csanyi
Electric Motor
When a 3-phase motor expirience phase failure, what a mess…
A phase failure is an interruption of a single conductor. The motor then continues running with two phases and can suffer damage. The cause is, for example, blown fuse. Small to medium sized motors are mostly stator critical – this… Read more
Feb 15, 2016 | By Edvard Csanyi
Electric Motor
Protection schemes for generators and motors
It is difficult to define precisely the protection schemes that should be adopted for an electricity distribution system, given the large number of valid alternatives for each situation, but some schemes will be presented as a guide for protecting the… Read more
Jan 15, 2016 | By Edvard Csanyi
Electric Motor
Five factors that mess up motor efficiency and how to improve it
It must be emphasised that the standard electric motor is already a very efficient device with efficiencies above 80% over most of the working range, rising to over 90% at full load. However, because of the high energy consumption, and the… Read more
Dec 23, 2015 | By Edvard Csanyi
Electric Motor
The Design Basics Of Motor Protection Circuit Breaker
Application-specific variations of the MCCB, these breakers combine the short-circuit and isolation functionality of the MCCB with the motor overcurrent protection of a traditional overload relay. MPCBs are UL 489 Listed as circuit breakers and verified as motor overload relays. These… Read more
Dec 07, 2015 | By Edvard Csanyi
Electric Motor
PLC Ladder Diagrams for Electrical Engineers (Beginners)
As an introduction to ladder diagrams, consider the simple wiring diagram for an electrical circuit in Figure 1a. The diagram shows the circuit for switching on or off an electric motor. We can redraw this diagram in a different way,… Read more
Nov 30, 2015 | By Edvard Csanyi
Electric Motor
Comparison of 4 Different Flow Control Methods Of Pumps
When in use, the pumps are always part of a pumping system. A pumping system is usually a network of pipes, tanks, valves and other system parts. The receiver is usually at a higher geographic level than the supply of… Read more
Nov 27, 2015 | By Edvard Csanyi
Electric Motor
Guidelines to electrical braking of asynchronous motors
In many industrial systems, motors are stopped simply by natural deceleration. The time this takes depends solely on the inertia and resistive torque of the machine the motor drives. However, the time often needs to be cut down and electrical… Read more
Nov 23, 2015 | By Edvard Csanyi
Electric Motor
Troubleshooting An Open Circuit Faults in the Control Circuit
– The machine does not start when the start button is pressed. At this point the problem could be mechanical or electrical. We will focus on just the electrical circuit faults for now. This fault could be located in either… Read more
Oct 26, 2015 | By Edvard Csanyi
Electric Motor
19 Essential Information You Can Find On Motor Nameplate
Motor nameplate is normally located on all produced electric motors. Understanding motor nameplate details can be hard sometimes, but is essential. In most countries it is a requirement for manufacturers to display all information on the motor’s nameplate, but often… Read more
Aug 29, 2015 | By Edvard Csanyi
Electric Motor
Comparison of Soft Starting and Frequency Converter Motor Starting
A soft starter is, as you would expect, a device which ensures a soft starting of a motor. A softstarter has different characteristics to the other starting methods. It has thyristors in the main circuit, and the motor voltage is… Read more
Aug 12, 2015 | By Edvard Csanyi
