A single phase non-salient pole synchronous motor with no D.C excitation is known as hysteresis motor. This motor is so called because it runs on torque produced by the hysteresis loss induced in the rotor. Figure 1: Hysteresis Motor.
What is Hysteresis Motor? Working, Diagram, Construction & Applications Read More »
We know that the expression for torque of an induction motor under running condition is given by, \[T=\frac{KsE_{2}^{2}{{R}_{2}}}{R_{2}^{2}+{{(s{{X}_{2}})}^{2}}}\]
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Figure 1: Power Flow Diagram of Induction Motor.
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Figure 1: Losses in Induction Motor.
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If the voltage applied to the induction motor contains harmonics, then the harmonic fluxes are developed in the gap due to the magnetics of the motor. These harmonic fluxes induce e.m.f and circulate harmonic currents in the rotor windings.
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Ohmmeter is used to directly measure resistance of a device, element, circuit or any portion thereof. This meter is used to determine approximate (not too accurate) resistance of the circuit components. It can be used to measure the resistance of heating element of heater, electric iron, field coil resistance, sorting resistors used in electronics circuits. It can also
What is Ohmmeter? Construction, Circuit Diagram, Types & Working Read More »
Figure 1: Star-Star or (Y-Y) Connection. Fig. 1 shows a star-star connection of primary and secondary windings.
What is Star-Star or (Y-Y) Connection of Three Phase Transformer? Read More »
When a DC generator is loaded, the current flows through the armature winding, commutator and brushes to the external circuit. During this process, whenever a brush spans the two commutator segments, the winding element connected to those commutator segments is short-circuited. The changes in current direction, which take place in the winding part, just before,
Commutation in DC Machine (Generator or Motor) – Process & Remedies Read More »
A DC generator is the most commonly used separately excited generator, used for electroplating and battery charging. A separately excited generator is one in which the magnetic field is excited from an external DC source. The DC source may be a DC generator or a battery or a metal rectifier connected to an AC supply.
What is Separately Excited DC Generator? Circuit diagram, Characteristics & Advantages Read More »
The armature control method works on the principle that the speed of the DC motor could be varied by varying the back emf. Fig. 1: Armature Control Method of DC Motor.
What is Armature Control Method of DC Motor? Working Principle, Diagram & Applications Read More »