Why Carbon Brushes Placed along MNA in a DC Generator?

Carbon Brushes are used collect the current due to the induced emf from the armature coils in a DC Generator, as all of us know. When a brush is at any particular commutator segment, it shorts out that particular coil and draws current from the rest of the coils. If the brush is not exactly … Read more Why Carbon Brushes Placed along MNA in a DC Generator?

What will happen if DC Motor run at a Higher RPM than the Rated RPM?

This may come in our mind that what exactly will happen if we operate a DC Motor at a speed more than the rated speed. In fact, the thermal capacity of the motor decides at what speed it can run and for how long. There is always a safety factor considered in the design which … Read more What will happen if DC Motor run at a Higher RPM than the Rated RPM?

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 Difference between AC and DC Generator

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 Basics of Servomechanism and Servo Motor

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 Brushless DC (BLDC) Motor

Ward-Leonard Method of Speed Control

As discussed in the previous post “Speed Control of DC Motor”, speed of DC Motor can be controlled by varying the terminal voltage Vt of the DC Motor. Ward-Leonard Method is the application of this principle where the terminal voltage Vtof DC Motor is varied to control the speed of DC Motor. Ward-Leonard Method of … Read more Ward-Leonard Method of Speed Control