Torque Equation of DC Motor

Torque equation of DC Motor gives the amount and nature of electrical torque Te developed whenever it is taken into service. Basically the performance of DC machine centers around two equations. One is EMF equation and another is Torque Equation. Therefore, understanding of torque equation is a must for performance analysis. These equations equally apply … Read more Torque Equation of DC Motor

VRLA Battery – Valve Regulated Lead Acid Battery

A VRLA battery or Valve Regulated Lead Acid Battery is commonly known as a sealed battery or maintenance free battery. This is one type of Lead acid rechargeable battery. Due to the construction of VRLA Battery, it do not require ventilation and can be mounted in any orientation and do not require constant maintenance. The … Read more VRLA Battery – Valve Regulated Lead Acid Battery

Factors Affecting Lead Acid Battery Life

A storage battery can have a relatively long life. Some lead acid batteries may operate efficiently for around 20 years or more, provided all conditions of operation are ideal. Such conditions are not usually obtainable. The end of battery life may result from either loss of active material, lack of contact of active material with … Read more Factors Affecting Lead Acid Battery Life

Sulphation and Buckling in Lead Acid Battery

What is Sulphation? Sulphation in Lead Acid Battery refers to the formation of Lead Sulphate (PbSO4) on the plates of battery. For better understanding of Sulphation, let us first consider the chemical reaction taking place in the lead acid battery. In lead acid battery, lead dioxide (PbO2) acts as a positive plate and lead (Pb) … Read more Sulphation and Buckling in Lead Acid Battery

Why DC Series Motor has High Starting Torque?

DC Series Motors are widely used for the purposes requiring high starting torque like in Hoist, Crane, Electric Traction etc. In this post we will discuss the reason behind the high starting torque of DC Series Motor. For any DC motor, torque is directly proportional to the flux and armature current i.e. Ƭ = KaØIa  … Read more Why DC Series Motor has High Starting Torque?

Detrimental Effects of Armature Reaction

As discussed in earlier post, Purpose of Interpole in DC Machine, there are two types of effect of armature mmf on the main field flux: 1)      Distortion in Main Field Flux 2)      Net reduction of Main Field Flux Due to the above two effects of armature mmf, there are many detrimental effects on the Electrical … Read more Detrimental Effects of Armature Reaction

Advantage and Disadvantage of DC Series Motor

Advantages of DC Series Motor: The series motor has the highest starting torque for a given power rating. When the motor is overloaded, the speed drops and the torque increases. While delivering high torque during an overload, the series motor draws less current and power from the source compared to a shunt or compound DC … Read more Advantage and Disadvantage of DC Series Motor