When a transformer is energized after a short interruption, the transformer may draw high inrush currents from the system due to core magnetization being out of synch with the voltage. The inrush currents will be as high as short-circuit currents in the transformer (almost 20 to 40 times the rated normal full load current of … Read more
DC machine whether it is motor or generator will have four essential parts. They are Field System Armature Commutator Brush and Brush gear 1. Field System The objective of field system in DC machine is to provide uniform magnetic field, within which armature rotates. For small rating motors permanent magnets are used and for large … Read more
AC power has become popular and advantageous because of easy generation, transmission with fewer losses to long distances due to stepping up voltage and stepping down the voltage to the desired level. In Industries 70% of the motors and drives used are Induction motors, hence ac motors in general means induction motors. Induction motors were … Read more
Traction is defined as ‘the act of drawing or pulling especially by a motive force‘ (drawing of carriage by horse constitute traction). In mechanical terms, it is defined as the ‘adhesive friction between the wheel and the surface on which it moves‘ (between a car tire and road). Traction system can be broadly classified as … Read more
Braking in DC motor is employed to make the dc motor to halt from operating condition by applying a brake. It is to be considered that significant difference exists between the words ‘braking’ and ‘breaking’, should not get confused. In dc motors we apply the brake to make the dc motor halt. Different braking methods … Read more
In DC series motor field coils or winding will be in series with the armature winding. The conductor size of the field winding will be having a thick wire (large cross section) with lesser turns. Advantages of DC Series Motors The main application where series motors are best suited is for traction applications. The torque … Read more
In spite of the wide use of AC supply, DC machines have some advantages compared to ac motors and are used in industries for some applications. Some of the DC Motor Applications in Industries are listed below. Applications of DC Series Motor DC series motors are widely used for electrical traction applications, i.e, these motors … Read more
In thermal power plants, dc motors are employed for certain control and critical emergency operations which are supplied by dedicated batteries. DC motors operate as backup drives for normal ac drive systems when AC power supply to the plant is lost. In thermal power plant, the dc motors find applications for performing control functions such … Read more
We have seen that whenever the flux, linking with a closed electric circuit changes, an EMF has induced in the circuit and a current flow, the value of which depends on the emf around the circuit and the resistance of the circuit. It is not necessary that the circuit be a wire and that the … Read more
The power rating of a transformer or any electric machines indicates the maximum value of voltage and current it can carry without over-heating. Power = Voltage(V) × Current(A) × Power factor As transformer is considered as a power source while the induction motor is considered as a load. Manufacturers of Transformers cannot predict the power … Read more
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