Regenerative Braking

In the last post “Need for Electrical Braking in Electrical Drives“, we discussed the various reasons which call for Electric Braking. Brakes are used to reduce or cease the speed of motors. Braking of Motor can be classified into three types: Regenerative Braking. Plugging type Braking. Dynamic Braking. In this post we will focus on … Read more

Difference between AC and DC Generator

When there is a change in magnetic flux linkage through a conducting loop, an emf is developed as per the Faraday’s Law of Electromagnetic Induction. Generators use Electromagnetic Induction to convert mechanical energy into electrical energy. In an AC, or alternating current, Generator, the electrical current periodically reverses its direction. With a DC, or direct … Read more

Basics of Servomechanism and Servo Motor

Servomechanism is a powered mechanism producing motion or forces at a higher level of energy than the input level, e.g. in the brakes and steering of large motor vehicles, especially where feedback is employed to make the control automatic. A servomechanism, sometimes also called Servo, is an automatic device that uses error-sensing negative feedback to … Read more

Speed Control of BLDC Motor

Speed control of BLDC motor is essential for making the motor work at desired rate. Speed of a brushless dc motor can be controlled by controlling the input dc voltage / current. The higher the voltage more is the speed. Many different control algorithms have been used to provide control of BLDC motors. The motor … Read more

Brushless DC (BLDC) Motor

What is a Brushless DC or BLDC Motor? A Brushless DC Motor, BLDC accomplishes commutation electronically using rotor position feedback to determine when to switch the current. The BLDC motor is electrically commutated by power switches instead of brushes. The structure of Brushless DC Motor, BLDC is shown in figure below. In simple words, a … Read more

How Commutator Convert AC to DC?

A commutator in a DC Machine has alternate bands of Copper and mica. Now when the armature starts to rotate by an external force (in DC Generator), the coils situated in the armature also rotate. The coils are shorted via brush segment with alternate change in influence of poles. This alternate change via the commutator … Read more