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How an electric motor works?

  An electric motor is a device that converts electrical energy into mechanical energy. It works by using the principle of electromagnetism, which is the interaction between electric currents and magnetic fields. There are different types of electric motors, but the basic idea is the same: a coil of wire carrying an electric current rotates inside a magnetic field, creating a force that makes the coil spin. One of the simplest electric motors is a DC motor , which runs on direct current (DC) from a battery or a power supply. A DC motor has two main parts: a rotor and a stator. The rotor is the part that spins and has a coil of wire wrapped around an iron core. The stator is the part that stays still and has a permanent magnet or an electromagnet. The coil of wire on the rotor is connected to a split ring called a commutator, which rotates with the coil and switches the direction of the current every half turn. This ensures that the coil always experiences a force in the same direc...
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How to differentiate star from delta connection in electric motors?







One way to differentiate star from delta connection in electric motors is to look at the terminal box of the motor, where the wires are connected. In a star connection, the terminals W2, U2 and V2 are joined together by metal plates, and the terminals W1, U1 and V1 are connected to the external power supply or load. 
STAR CONNECTION 


In a delta connection, the terminals U1, V1 and W1 are joined to W2, U2 and V2 respectively by metal plates, forming a triangular shape. The terminals A, B and C are connected to the external power supply or load. You can see some examples of star and delta connections in the terminal boxes of motors : 

DELTA CONNECTION 


THIS VIDEO SHOWS THE DIFFERENCE BETWEEN STAR AND DELTA CONNECTION IN ELECTRIC MOTORS 

 Another way to differentiate star from delta connection in electric motors is to measure the resistance or voltage across the terminals of the motor. In a star connection, the resistance or voltage between any two terminals is equal to the resistance or voltage of one winding. In a delta connection, the resistance or voltage between any two terminals is equal to the resistance or voltage of two windings in series.  

I hope this helps you understand how to differentiate star from delta connection in electric motors.






 Source: 10/12/2023 
 (1) How To Identify Star and Delta Motor Terminal Connections. https://engineerfix.com/mechanical/how-to-identify-star-and-delta-motor-terminal-connections/.
 (2) Star-Delta Connection: Analysis of Three-Phase Motor Control. https://electricaliq.com/star-delta-connection-analysis-of-three-phase-motor-control/. 
 (3) Star Delta Starter: Explained in Plain English| Electrical4U. https://www.electrical4u.com/star-delta-starter/. 
 (4) Using Star-Delta Motor Control (With Circuit Diagrams). https://turbofuture.com/industrial/How-to-learn-Star-Delta-Motor-Control-A-Basic-Guide-to-Learning-Star-Delta-Motor-Controller. 
 (5) Star-delta motor starter explained in details | EEP. https://electrical-engineering-portal.com/star-delta-motor-starter.
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