Ppt induction motor powerpoint presentation free to. A typical shadedpole motor with a cage rotor is shown in fig. Shaded pole motor is a split phase type single phase induction motor. Let us discuss the constructional details, diagrams and working of shaded pole motors in detail. Pole of the field moves past the winding, a large current flows through the winding.
A brief description of how the shaded pole motor works. Shaded pole induction motors working and construction. But in case of a single phase induction motor, the stator has two windings instead of one three phase winding in three phase induction motor. Rfoc of a single phase induction motor im with two asymmetrical main and. Single phase motor starting in addition to the run or main winding, all induction singlephase motors are equipped with an auxiliary or start winding in the stator. The stator core, made from grain oriented silicon steel for low loss and high. Single phase induction motors are used where three phase power is not. Working of single phase induction motors is explained in this video with help of animation. Singlephase motors for household applications intechopen.
Single phase induction motors multiple choice questions and answers pdf free download,interview questions,objective type questions,lab viva manual. The auxiliary or start winding overlaps the main or run winding. Why there is no starting torque in a singlephase induction motor with one main winding in. As an example, a typical fourpole motor running on 60 hz might have a nameplate. Shaded pole motor is a salient pole, split phase type, squirrel cage rotor single phase induction motor provided with one or more auxiliary shortcircuited stator winding is placed in magnetic position from the main winding. The shaded pole motor rotates only in one particular direction, and the reverse movement. The shaded pole motor is very popular for ratings below 0.
The construction of single phase induction motor is almost similar to the squirrel cage three phase induction motor. Once they are free, the braking pads move axially in their seating. Starting methods for singlephase induction motor nptel. The equivalent circuits of the singlephase induction motor and of the linestart permanent magnet are. In twopole singlephase motors, the torque goes to zero at 100% slip zero speed. Various starting methods used in the singlephase induction motors, with the intro. With the poles shown, the rotor will rotate in the clockwise direction. Free software is available online to help in selecting energy efficient. Shaded pole single phase motors like any other motors. Shaded pole motor is one of the types of single phase induction motors, which are used for producing a rotating stator flux in order to make the single phase induction motor a self starting one.
This video provides basic idea about working principle of single phase induction motor. The first commutatorfree single phase ac induction motor was invented by hungarian. The rotor in the single phase induction motor is of squirrel cage rotor type. Singlephase voltage and power is easily available from a threephase system by merely tapping. Efficiency classes of singlespeed threephase cage induction motors.
The advantages of shaded pole induction motor are very economical and reliable. Single phase induction motors multiple choice questions. Softstarting techniques for capacitorrun singlephase induction motors conference paper pdf available october 1997 with 2,011 reads how we measure reads. In a split phase motor, the running winding should have a high resistance and low inductance. The shadedpole motor is the original type of ac singlephase induction motor, dating back to. This provides the revolving field necessary to turn the. A threephase electric motor, 100 hp 75 kw, iv poles. An induction motor or asynchronous motor is an ac electric motor in which the electric current. How does a single phase induction motor capacitor induction motor or ac motor work. An ac motor is an electric motor driven by an alternating current ac. Ferraris demonstrated a working model of his singlephase induction motor in 1885, and tesla. Double revolving field theory is very well explained.
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