Category Archive for: «Motor»

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Protection Schemes For Generators and Motors

Protection schemes // 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 various elements that make up a power system. However, any protection scheme […]

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5 Factors That Mess Up Motor Efficiency and How To Improve It

Motor efficiency vs Energy losses 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 very large number of installed units, even a small increase […]

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The Design Basics Of Motor Protection Circuit Breaker

Motor protection circuit breaker (MPCB) // 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 devices are traditionally used in two component starter applications, […]

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PLC Ladder Diagrams for Electrical Engineers (Beginners)

Introduction to PLC ladder diagrams // 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, using two vertical lines to represent the input power […]

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Comparison of 4 Different Flow Control Methods Of Pumps

Pump as a part of the process // 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 the system. These parts can be also […]

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Electrical Braking Of Asynchronous Motors – The Guidelines

Electrical braking of 3-phase motor // 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 braking is a simple and efficient solution. Compared to […]

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Troubleshooting An Open Circuit Faults in the Control Circuit

General Troubleshooting Procedure //  – 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 the power circuit or the control circuit. The fault could also […]

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19 Essential Information You Can Find On Motor Nameplate

Understanding motor’s nameplate Motor nameplate is normally located on all produced electric motors. Understanding nameplate information 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 this is not the case. However, when a motor has been in operation […]

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Comparison of Soft Starting and Frequency Converter Motor Starting

Soft 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 regulated with a printed circuit board. The softstarter makes use of the fact […]

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Comparision of Direct-on-line (DOL) and Star-delta Motor Starting

Motor starting methods // Direct-on-line (DOL) starting Advantages Drawbacks Star-delta starting Advantages Drawbacks Comparision of DOL and Star-delta starting Direct-on-line starting (DOL) As the name suggests, direct-on-line starting means that the motor is started by connecting it directly to the supply at rated voltage. Direct-on-line starting, (DOL), is suitable for stable supplies and mechanically stiff […]

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