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Category 'Electric Motor' - Technical Articles

Category “Electric Motor” is dedicated to technical articles about an electric motor. Dozen of published articles describe single-phase and three-phase induction motors and other motor types, their construction, starting methods, protection, wiring diagrams, maintenance and testing procedures. Special attention is given to analysis of motor schematics and troubleshooting.

Electric Motor

MCC Circuit Featuring Auto Re-Closure Relay Functionality

An MCC circuit of a motor could be based on the Direct Online Starter (DOL) or Star Delta Starter which has something to do with the requirement of the power system in an industry. But it could have additional logics…...

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Apr 14, 2025 | By

MCC Circuit Featuring Auto Re-Closure Relay Functionality
Electric Motor

Star-delta starting used with large horsepower motors

Star-delta starting is frequently employed with high horsepower motors to mitigate inrush current during the start-up stage and to reduce starting torque. Star-delta starting involves initially connecting the motor stator windings in a star configuration during the motor startup phase,… Read more

Oct 16, 2024 | By

Wye-delta starting used with large horsepower motors
Electric Motor

The analysis of relay control systems: Electrical schematics with latch, step and lockout relays

To be honest, expertise in relay systems is fundamental for comprehension and creativity in circuits design. From bi-stable relays that maintain their states without continuous power to step relays facilitating incremental changes, and lockout relays guarding against unauthorized reenergization, each…...

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Feb 26, 2024 | By

The analysis of relay control systems: Electrical schematics with latch, step and lockout relays
Electric Motor

Mastering schematic drawings: Analyzing seal-in contacts in motor control circuits

In the domain of electrical engineering, seal-in contacts stand as pivotal components in control circuits, ensuring the sustained operation of electrical devices beyond the initial activation. These mechanisms play a critical role in maintaining the energized state of circuit elements,…...

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Feb 12, 2024 | By

Mastering schematic drawings: Analyzing seal-in contacts in motor control circuits
Electric Motor

The art of achieving synchronous motor transient stability (especially in weak grids)

Since the subject of this article is somewhat not-that-easy to understand, I suggest starting with the basics of the synchronous motor. In the synchronous motor, the basic magnetic field is obtained by direct current excitation rather than through the air…...

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Feb 06, 2023 | By

The art of achieving synchronous motor transient stability
Electric Motor

Main and auxiliary circuit diagrams of switching pole-changing three-phase motors

This technical article is dedicated to the main and auxiliary circuit diagrams of switching three-phase motors. We’ll now discuss a little more complicated schematics than the previous article. We’ll cover seven schematics of switching pole-changing three-phase induction motors with one…...

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May 23, 2022 | By

Main and auxiliary circuit diagrams of switching pole-changing three-phase motors
Electric Motor

Never let an electric motor drop dead. Learn how to listen and read the motor’s soul.

Like any other machine, electric motors are vulnerable to faults, which might lead to catastrophic failure of the machine in the long run if left unmonitored. In this technical article, I will try to shed some light on the possible…...

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Nov 29, 2021 | By

Never let an electric motor drop dead. Learn how to listen and read the motor’s soul.
Electric Motor

Guidelines for selecting the proper Variable Frequency Drive (VFD) for motor applications

This article addresses the Variable Frequency Drive (VFD) concept in several aspects that matter the most in selecting the proper VFD for applications. One of the important factors is the control type required for a given application since it is…...

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Jun 28, 2021 | By

Guidelines for selecting the proper Variable Frequency Drive (VFD) for motor applications


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