Three Phase Induction Motors – Construction
A three phase induction motor has two main parts stator rotor. The rotor is separated from the stator by a small air-gap which ranges from 0.4 mm to 4 mm,
Synchronous Motor
The motor which runs at synchronous speed is known as the synchronous motor. The synchronous speed is the constant speed at which motor generates the electromotive force. The synchronous motor is used for converting the electrical energy into mechanical energy.
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Starting Methods for Synchronous Motor
Synchronous motors are not self-starting. Some additional devices should be used to start the motor. Basically, there are two methods for starting synchronous motors: Induction motor starting (Damper winding) Auxiliary motor
Split Phase Induction Motor – Operation and Characteristics
Before going to the operation and characteristics of split-phase induction motor we should first understand why single phase induction motor is not self-starting. To make a single-phase induction motor self-starting,
Single Phase Induction Motor – Working Principle and Construction
Single-phase motors are the most familiar of all-electric motors because they are extensively used in home appliances, shops, offices etc. It is true that single-phase motors are a less efficient
Production of Rotating Magnetic Field
The production of Rotating magnetic field in 3 phase supply is very interesting. When a 3-phase winding is energized from a 3-phase supply, a rotating magnetic field is produced. This
Multiple Choice Questions (MCQs) on Synchronous Motors
1. A synchronous motor can operate at (A) Lagging power factor only (B) Leading power factor only (C) Unity power factor only (D) Lagging, leading and unity power factor only
Insulation Resistance Test (IR Test) or Megger Test
Insulation Resistance or IR Test is carried out by maintenance engineers to ensure the healthiness of the overall insulation system of electrical equipment. It reflects the presence or absence of
Electrical and Mechanical Noise in Motors
Two types of noises occur in an electric motor, one is electrical noise and the other is mechanical noise. The causes of remedial treatments for both are discussed in this
Electric Motor Maintenance : Preventive, Predictive and Reactive Maintenance
Electric Motors need maintenance regularly in order to avoid failure and prolong their lifespan. Generally, motors and motor parts should be maintained and tested at least every 6 months. Then
Comparison between Induction Motor and Transformer
An induction motor may be considered to be a transformer with a rotating short-circuited secondary. The stator winding corresponds to the transformer primary and the rotor winding to the transformer
Characteristics of DC Series Motor
In this post, we will look into the characteristics of a DC series motor. A DC series motor is one type of DC motor in which field winding is connected
Armature Reaction in DC Motors
Armature reaction also occurs in a DC motor just like armature reaction in DC Generator. This is expected because when current flows through the armature conductors of a DC motor,