Induction machines are also called asynchronous machines i.e. the machines which never run at a synchronous speed. Whenever we say induction machine we mean to say induction motor. Induction motors may be single-phase or three-phase. In this article, I am discussing about three phase induction motor construction. The three-phase induction motors are the most commonly used […]
A shaded pole motor is constructed with salient poles in the stator. Each pole has its exciting coil. A 1/3rd portion of each pole core is surrounded by a strap of copper forming a closed loop called the shading coil. The rotor is a usual squirrel cage type. The common form of these motors has only
In ac circuits, power is measured with the help of wattmeter. A wattmeter is an instrument, which consists of two coils called the potential coil (PC) and the current coil (CC). The potential coil having high resistance is connected across the load and carries the current proportional to the potential difference across the load. The current coil
In this method of interconnection, the dissimilar ends of three phase windings are joined together i.e. finishing end of one phase is connected to the starting end of the other phase and so on to obtain a closed circuit. The three line conductors are taken from the three junctions of mesh and are denoted by R,
If the three armature coils of a 3-phase alternator are not interconnected but are kept separate, as shown in Figure below, then each phase or circuit would need two conductors, the total number of conductors, in that case, being six. It means that each transmission cable would contain six conductors which will make the whole
Hi friends, In this article, I am discussing the eddy current loss, eddy current loss formula, its causes and applications. So let us start with our topic. What is eddy current loss? Whenever the magnetic flux linking to conducting material changes, voltages are induced in all possible paths and hence the induced currents are set up
Hi friends, in this article, I am going to discuss the hysteresis loss, hysteresis loop in the magnetic material in and their significance. So let us start. A ferromagnetic material consists of local regions called ‘domains,’ each of which is spontaneously magnetized. In an unmagnetized material, the directions of magnetization in different domains are different.
When the flux linking with a coil (or conductor) changes, an EMF is induced in the coil. This EMF can be induced by the following two ways: Self Induced EMF The EMF induced in a coil due to change of flux produced by it linking with its own turns is known as self-induced EMF. Consider
A closed path followed by magnetic flux is known as a magnetic circuit. In a magnetic circuit, flux starts from one point and finishes at the same point. A magnetic circuit usually consists of magnetic materials having high permeability such as iron, soft steel, etc. since they offer small opposition to magnetic flux. The magnetic
In DC circuits, the product VI gives the power in watts drawn by the circuit. But in AC circuits, things are different. In AC circuits, the product VI gives the apparent power and not the real power because the voltage and current are not in phase with each other. Power Factor in AC Circuit The