Electronic Hub

Conductance: What is it? (Definition, Units & Formula) What is Conductance? Conductance (also known as electrical conductance ) is defined as the potential for a substance to conduct electricity Conductance is the measure of how easily electrical current (i.e. flow of charge) can pass through a material. Conductance is the inverse (or reciprocal) of electrical resistance, represented as 1/R. To have a better understanding of conductance, one must recall the resistance of an object. In a qualitative sense, the resistance tells us how difficult it is for an electrical current to pass. The resistance between two points can be defined in the quantitative sense as the difference in voltage that is needed to carry a unit current across the two specified points. The resistance of an object is represented as the ratio of the voltage across something to the current passing through it. The resistance is measured in Ohms. The conductance of a component is a determination of how quickly c...

The following information deals with the general working principles of Synchronous and Asynchronous motors, their advantages and where are they normally used and what can be achieved using each of these motors. Synchronous and Asynchronous Motors – Working Principles Synchronous Motors This is a typical AC electrical motor that is capable of producing synchronous speeds. In these motors, both the stator and the rotor rotate at the same speed thus achieving synchronization. The basic working principle is, when the motor is connected to the mains, electricity flows into the stator windings, producing a rotating electromagnetic field. This is in turn induced on to the windings in the rotor which then starts rotating. An external D.C source is required to lock the rotor’s rotating direction and position with that of the stator. As a result of this interlocking, the motor has either to run synchronously or not run at all. Asynchronous Motors The working principle of asy...

Star Delta Starter: Circuit Diagram, Working Principle & Theory What is Star Delta Starter A   star delta starter   is the most commonly used method for the starting of a   3 phase induction motor . In star delta starting an   induction motor   is connected in through a   star connection   throughout the starting period. Then once the motor reaches the required speed, the motor is connected in through a   delta connection.  A star delta starter will start a motor with a star connected stator winding. When motor reaches about 80% of its full load speed, it will begin to run in a delta connected stator winding.     A s tar delta starter is a type of reduced voltage starter. We use it to reduce the starting current of the motor without using any external device or apparatus. This is a big advantage of a star delta starter, as it typically has around 1/3 of the inrush current compared to a DOL starter .     T...

Starting of  Induction Motor A three phase Induction Motor is Self Starting. When the supply is connected to the stator of a three-phase induction motor, a rotating magnetic field is produced, and the rotor starts rotating and the induction motor starts. At the time of starting, the motor slip is unity, and the starting current is very large. The purpose of a starter is not to just start the motor, but it performs the two main functions. They are as follows. To reduce the heavy starting current To provide overload and under voltage protection. The three phase induction motor may be started by connecting the motor directly to the full voltage of the supply. The motor can also be started by applying a reduced voltage to the motor when the motor is started. The torque of the induction motor is proportional to the square of the applied voltage.Thus, a greater torque is exerted by a motor when it is started on full voltage than when it is started on the reduced voltage. There are three ...

Types of Induction Motor There are mainly two types of induction motor on the basis of power supply, Single Phase Induction Motor and Three Phase Induction Motor. As their name suggests, 1 phase AC power supply is extended to single phase induction motor while three phase induction motor is connected to 3 phase AC power supply. Types of Single Phase Induction Motor: Again, single phase induction motor may be classified on the basis of their construction and starting methods. On this basis, they can be further categorized into following types: Split Phase Induction Motor Capacitor Start Induction Motor Capacitor Start Capacitor Run Induction Motor Shaded Pole Induction Motor Types of 3 Phase Induction Motor: A three phase induction motor (IM) has two major components, Stator and Rotor. Stator is the stationary part whereas Rotor is rotating part. Load is coupled to the rotor shaft of the motor. Three phase armature winding is wound on the stator. When balanced three phase current fl...

Induction Motor: Working Principle, Types, & Definition What is an Induction Motor? An induction motor (also known as an asynchronous motor ) is a commonly used AC electric motor. In an induction motor, the electric current in the rotor needed to produce torque is obtained via electromagnetic induction from the rotating magnetic field of the stator winding. The rotor of an induction motor can be a squirrel cage rotor or wound type rotor. Induction motors are referred to as ‘asynchronous motors’ because they operate at a speed less than their synchronous speed. So first thing to understand – what is synchronous speed? Induction Motor Synchronous speed is the speed of rotation of the magnetic field in a rotary machine, and it depends upon the frequency and number poles of the machine. The induction motor always runs at speed less than its synchronous speed. The rotating magnetic field produced in the stator will create flux in the rotor, hence causing the rotor ...