A universal motor is a modified form of a DC series motor and is widely used in home appliances like mixers and machine tools. In this article, I am discussing the universal motor working principle. The construction of universal motor is very similar to a two-pole DC series motor. It consists of two field coils wound on a […]
A capacitor motor is also a split-phase induction motor. In this motor, starting winding has a capacitor in series with it. To start the motor, the necessary phase difference between both windings currents is produced by connecting a capacitor in series with it. This is improved form of split phase motor. This type of motor
A split phase motor is provided with an auxiliary stator winding called starting winding in addition to main or running winding. These windings are placed in the stator slots. Both the windings are put in parallel. The purpose is to get two different currents sufficiently displaced in phase from each other so that a revolving
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A mechanical resonance type frequency meter indicate the supply frequency of the circuit directly and is very much convenient for most practical purposes. It is a very simple instrument and has got an advantage of giving reading free from errors due to change in temperature, waveform and magnitude of applied voltage. Construction of Mechanical Resonance Type
The power factor of a circuit can be found from the wattmeter reading and voltmeter and ammeter readings suitably connected in the circuit. Power factor = Wattmeter reading ÷ (Voltmeter reading x ammeter reading). Power factor = True Power ÷Apparent Power This method involves mathematical calculations. Sometimes it is required to measure the power factor of the
Hi friends, In this article, I am going to describe the megger earth tester working principle and method of earth resistance measurement by it. I hope you will find it informative and helpful. The Resistance of the earth can be measured with the help of megger earth tester or earth megger. Megger Earth Tester Working Principle |
Hi friends, In this article, I am going to discuss the hand-operated megger working principle, and I will give you some important information about it. So keep reading. Insulation of any electrical machine is a very important part of the machine. Many times, machines fail due to the failure of insulation. Therefore, it is very
An analog multimeter is the most commonly used instrument by technicians and engineers in the laboratory, as well as other repair works. As it is clear from the name of this instrument, it can make many (multi) measurements with reasonable accuracies such as AC and DC voltages, currents, and resistances. Since it is a milliammeter,
A dynamometer type wattmeter is basically a moving coil instrument. But in this case, the operating field is produced by the fixed coil instead of a permanent magnet. A wattmeter in which fixed coils produce the operating field is known as a dynamometer type wattmeter. The dynamometer type wattmeters are very significant because we use
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There is no fundamental difference between the operating principles of ammeters and voltmeters. Both are current-operated devices (except electrostatic type voltmeters) i.e. deflecting torque is produced when current flows through their operating coils. In an ammeter, the deflecting torque is produced by the current to be measured or by a definite fraction of it whereas