Machines - Page 2 of 11 - Electrical Volt

What is Plugging or Reverse Current Braking of DC Motor?

In Plugging or Reverse Current Braking, supply polarity of armature voltage of  DC motor is reversed to rapid stop the motor. The armature voltage(V) and back EMF (Eb) … Read more

Difference between Copper Loss and Iron Loss

In this article, we will discuss the difference between copper loss and iron loss of the transformer. what are copper loss and iron loss and … Read more

Derivation of EMF Equation of a DC Generator

EMF Equation of DC Generator and DC Motor When we apply DC  voltage to an armature of a DC motor, a back emf or counter … Read more

Speed Regulation of DC Motor | Definition and Formula

The speed of the DC motor decrease with an increase of load on the motor. This is not desirable. Therefore, there must be a lesser … Read more

What is Shaft Torque of DC Motor?- Definition, Formula and Solved Problem

The actual torque available at the motor shaft for driving the mechanical equipment is known as shaft torque(Tsh). In fact, the same electromagnetic or gross … Read more

Different Ways to Improve Starting Torque of A.C. Induction Motors

A.C. induction motor starting torque is very low as compared to DC motor starting torque. Also, during acceleration, the induction motor produces torque pulsation. As … Read more

Why do 3 phase induction motors not need a neutral?

3 Phase induction motor is a balanced three-phase load. Therefore, the induction motor draws a balanced current if the supply voltage and the impedance of … Read more

Shaft Grounding Devices | Shaft Earthing Devices

Shaft grounding devices minimize the shaft voltage and prevent bearings damage caused by the circulating current. There are numerous reasons for developing shaft voltage in … Read more

What is the Difference between Soft Starter and VFD?

The main difference between VFD and Soft Starter is that a VFD can increase or decrease the speed of the motor, while a soft starter only controls the smooth start and stop … Read more

Why is the core of a power transformer grounded?

Transformer is a static piece of equipment and it has primary and secondary winding. The low voltage winding has few turns of wire wound around … Read more