# Archive: Category «Electric Motor»

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# Why Raise the Power Factor? The Basics Every Electrical Engineer Should Understand.

A low power factor causes poor system efficiency. The total apparent power must be supplied by the electric utility. With a low power factor, or a high-kilovar component, additional generating… Read more

Jun 06, 2018 | Edvard

# Protecting Motor From External Network Disturbances (Unbalance, V/Hz-ratio and Re-Energizing)

Unbalance in the supply voltage is typically due to a broken phase condition somewhere in the upstream network. This may result from single-phase fuse failure or pole discrepancy of a… Read more

Jan 29, 2018 | Edvard

# Calculation of shaded-pole motor losses and efficiency at full load in 6 steps

First, let’s say few words about shaded-pole motors, and then dive into calculation procedure. A shaded pole motor is the simplest form of a single phase motor and is very… Read more

Jan 17, 2018 | Edvard

# Protection Of Industrial Power Supply Systems (Fuses, MCCBs and Overcurrent Relays Settings)

As industrial operations processes and plants have become more complex and extensive, the requirement for improved reliability of electrical power supplies has also increased. The potential costs of outage time… Read more

Jan 02, 2018 | Edvard

# 10 Common Questions You Can Expect In Electrical Engineering Examination Test

This examination will focus on testing the fundamentals of electrical engineering from low voltage to high voltage. Of course, you can use huge EEP’s resources for help in calculations and… Read more

Dec 26, 2017 | Edvard

# Contactor As An Important Part Of The Motor Control Gear

Motor control gear and associated circuitry are fundamental parts of electrical distribution and utilisation systems. Motor control gear in its simplest form may be a direct on-line starter consisting of… Read more

Dec 15, 2017 | Edvard

# 10 Different Duty Types (Load Cycle) Of A Three-Phase Asynchronous Motors

The term duty defines the load cycle to which the machine is subjected, including, if applicable, starting, electric braking, no-load and rest de-energized periods, and including their durations and sequence… Read more

Dec 11, 2017 | Edvard

# Practical Basics Of Synchronous Motors That Every Electrical Engineer Should Know

Like the asynchronous motor, the synchronous motor consists of a stator and a rotor separated by the air gap. It differs from the asynchronous motor in that the flux in… Read more

Nov 08, 2017 | Edvard

# How bad harmonics influence the work of motors and generators, transformers, capacitors etc.

The distortion in the waveform in the load current of any nonlinear device causes similar changes in the voltage waveform relative to the harmonic impedance of the source network. This… Read more

Oct 25, 2017 | Edvard

# Troubleshooting three basic hardwired control circuits used in starting electric motor

Generally speaking, basic control circuits are used in starting, stopping, sequencing, and safety automatic interlocking of equipment and machines. The control circuit consists of relays, relay contacts, contactors, timers, counters,… Read more

Oct 23, 2017 | Edvard

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