Category Archive for: «Motor»

Two Basic Methods Used For Braking a Motor (DC Injection and Dynamic)

Braking a Motor 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 1. DC Injection Braking DC injection braking is a method of braking in which direct current (DC) is applied to […]

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3 Reasons For Increased Efficiency Loss In Rewound Motors

The loss in efficiency of 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 used to perform the rewind, and is usually […]

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Regular Motor Maintenance To Avoid Failure (and Prolong Its Lifespan)

Motor maintenance // 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 maintenance regularly in order to avoid failure and prolong their lifespan. […]

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When a 3-phase motor expirience phase failure, what a mess…

Phase failure // 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 means that only the stator can be damaged. It has to be […]

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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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