Applications of DC series motors

Applications of DC serial publication tugsINTRODUCTIONWHAT IS ELECTRIC tug?An galvanising drive is a de evil using galvanising aptitude to produce automatic energy, nearly always by the interaction of magnetized fields and present-day(prenominal)-carrying conductors. The reverse process, that of using robotic energy to produce electrical energy, is accomplished by a generator or dynamo. Traction motors employ on vehicles often perform both tasks. In principle, in all electric motors can run as generators and vice versa, although that is non practical with all types in all applications. As a convention the precondition electric engine is not utilise for electric motors, just instead refers to a railroad electric locomotive.Electric motors be piece in a myriad of applications such as industrial fans, b pocket-sizeers and pumps, machine tools, planetary house appliances, queen tools, and computer disk drives, among many other applications. Electric motors whitethorn be operated by direct oc menstruum from a battery in a portable device or motor vehicle, or from alternating real from a central electrical distribution grid. The smallest motors may be found in electric wristwatches. Medium-size motors of highly standardized dimensions and characteristics provide convenient mechanical power for industrial uses. The very largest electric motors are used for propulsion of large ships, and for such purposes as pipeline compressors, with ratings in the thousands of kilowatts. Electric motors may be classified by the source of electric power, by their informal construction, and by application. The principleThe principle of conversion of electrical energy into mechanical energy by electromagnetic means was demonstrated by the British scientist Michael Faraday in 1821 and consisted of a free-hanging wire dipping into a pool of mercury. A steadfast magnet was placed in the middle of the pool of mercury. When a veritable was passed through the wire, the wire rotated around the magnet, showing that the current gave fountain to a circular magnetic field around the wire This motor is often demonstrated in school physics classes, but douse (salt water) is sometimes used in place of the toxic mercury. This is the simplest form of a class of electric motors called homopolar motors. A later refinement is the Barlows Wheel. These were demonstration devices only, contrastive to practical applications due to their primitive constructionTYPES OF ELECTRIC MOTORS1. AC MOTORS2. DC MOTORS SERIES MOTORS SHUNT MOTORS COMPOUND WOUND MOTORSDC MotorsA DC motor is designed to run on DC electric power. devil examples of pure DC designs are Michael Faradays homopolar motor (which is uncommon), and the ball bearing motor, which is (so far) a novelty. By far the most common DC motor types are the brushed and brushless types, which use internal and external commutation respectively to fabricate an oscillating AC current from the DC sourceso they ar e not rigorously DC machines in a strict senseSeries appalThe series wound motor has only one voltage proviso to the motor and the field winding is connected in series with the rotor coil coil winding.Universal Motors or Series woundIn a series wound DC motor, reversing either the field winding leads or the rotor winding leads go away reverse the direction of the motor. However, simply reversing the leads from the power sum will have no emergence on the direction of revolution since it is equivalent to reversing the current through both the individual windings in effect a double reversal. In other words the motor will turn in the same direction even though the current through the series windings is reversed. This means that the motor can run on alternating current as well as direct current since the direction of rotation is independent of the direction of the current through the series windings. Universal motors are often used in power tools and category appliances such as va cuum cleaners and food mixers. Characteristics The series motor has poor fixedness regulation. It delivers increasing crookedness with increased motor current but this is at the expense of speed which falls with increasing tortuousness demands. This motor has a very high starting torque because there is zero back EMF at zero speed nonetheless as the speed builds up so does the back EMF do a reduction in torque.Increasing the load on the motor tends to slake it down, but this in turn lowers back EMF and increases the torque to equip the load. Speed control is possible by varying the supply voltage. on a lower floor no load conditions the speed will accelerate to unsafe levelspossibly do destruction of the motor. The motor can be reversed by reversing the connections on either the field or the rotor windings but not both. Regenerative braking is not possible since the field current needs to be maintained but it collapses when the rotor current passes through zero and rever ses.Applications It is a variable speed motor i.e. very low speed at high torqe and vice versa. However at no load motor tends to occupy dangerous speed. The motor has a very high starting torque. So it is used for The series DC motor is an industry workhorse for both high and low power, fixedandvariable speed electric drives. Applications range from cheap toys to automotive applications. They are gimcrack to manufacture and are used in variable speed household appliances such as sewing machines and power tools. Its high starting torque makes it particularly suitable for a wide range of traction applications. industrial uses are hoists, cranes, trolly cars, conveyors, elevators, air compressors, vacuum cleaners, sewing machines etc.This is just an entering to my term paper and it will be explained in final term paper.