There are mainly two types of dc compound generator. These are long shunt and short shunt. For more information for these two types of dc generator please check the post types of dc generator. Both … Read more
No Load Characteristic of Series DC Generator We also call the no-load characteristic of a DC series generator as the open-circuit characteristic of the generator. In a dc series generator, all the field, armature, and … Read more
No Load Characteristics of Self Excited DC Shunt Generator The no-load characteristic of a self excited dc shunt generator is similar to that of a separately excited dc generator. In that case, we have to … Read more
No Load Saturation Characteristics of a Separately Excited DC Generator Here, we measure the terminal voltage of a no-load separately excited dc generator for various fields currents. We control the field current by a rheostat … Read more
There are different methods of testing of dc machines. Brake Test of DC Machine Brake test is a direct method. We apply here a brake to a water-cooled pulley mounted on the motor shaft. We … Read more
Since DC motor is a machine it must have some losses during its operation. As the current flows through armature windings and field windings, there are certain copper losses. Since the current alters its direction … Read more
There are mainly two types of dc motors. These are shunt DC motor and series DC motor. There is another type of dc motor which has features of both shunt and series motor. Since it … Read more
Before discussing the characteristics of DC motors, let us recall the expression of speed and torque of a DC motor. Because these two relationships are quite essential for understanding the characteristics of a DC motor. … Read more
Before discussing regarding torque in dc motor, let us recall the concept of torque for reference. The torque means the turning moment or twisting moment of force about an axis. We measure a torque as … Read more
Before discussing the speed control of dc motor, let us first establish the expression of the speed of a dc motor. The voltage equation of a DC motor is Where Eb is the back EMF, … Read more