Its the simplest way to reduce the harmonic induction torque(i.e. by weakening the stator winding mmf harmonics)
In dc motors, the electric power is conducted directly to the armature (i.e., rotating part) through brushes & commutator. Hence, in this sense a dc motor can be called as a Conduction motor. However, in ac motors, the rotor does not receive any electric power by conduction but by induction in exactly the same way as the secondary of a two winding transformer receives its power from the primary. That is why such motors are called as Induction motors. An induction motor can be treated as a rotating transformer i.e., one in which primary winding is stationary but secondary is free to rotate.
A two-phase* system is archaic, and has been completely superceded by three-phase systems, so there is no demand for two-phase induction motors. (*A two-phase generator has two phase windings, displaced from each other by 90 degrees.)
Squirrel cage type is a type of Induction motor. It tells that the rotor is "squirrel cage" type. Another type of induction motor is with "slip ring" type of rotor. Squirrel cage type is most widely used Induction motor.
For a single phase motor, this can be done by connecting a capacitor in series with the starting windings. For three phase motors, this can be done by connecting starting resistors in the stator windings at starting. This reduces the stator current and hence it's flux density. Thus the rotor will have less opposition starting to rotate. Hence, the torque has increased.
the working principle of single phase induction motor is similar to the three phase induction motor, when we supply is given to the single phase induction motor a revolving field set up in the stator which produces a torqe air gap between north pole and south pole and rotor picks up speed
Daniel Harvey Braymer has written: 'Rewinding small motors' -- subject(s): Armatures, Electric motors, Fractional horsepower Electric motors, Windings 'Repair-shop diagrams and connecting tables for lap-wound induction motors' -- subject(s): Armatures, Electric motors, Induction Electric motors, Repairing
In dc motors, the electric power is conducted directly to the armature (i.e., rotating part) through brushes & commutator. Hence, in this sense a dc motor can be called as a Conduction motor. However, in ac motors, the rotor does not receive any electric power by conduction but by induction in exactly the same way as the secondary of a two winding transformer receives its power from the primary. That is why such motors are called as Induction motors. An induction motor can be treated as a rotating transformer i.e., one in which primary winding is stationary but secondary is free to rotate.
A two-phase* system is archaic, and has been completely superceded by three-phase systems, so there is no demand for two-phase induction motors. (*A two-phase generator has two phase windings, displaced from each other by 90 degrees.)
Windings for motors.
Windings for motors.
Xusheng Chen has written: 'Induction generator modeling and relaying' -- subject(s): Electric machinery, Induction, Electric motors, Induction, Induction Electric machinery, Induction Electric motors
Didn't work.because primary and secondary winding not in motorAnswerYes. The rotor behaves as a rotating secondary winding -i.e. there is no electrical connection between the field windings and the rotor.
ac motor is nothing but induction motor.So check out for characteristics of induction motors.
The field windings of a three-phase motor are termed 'phase windings'. An 'open phase' means that one of these windings has become open-circuited -i.e. there is a break in the winding. Unfortunately, however, 'line conductors' are often incorrectly referred to as 'phase conductors', so a break in a line conductor could (incorrectly) be called an 'open phase'!
Because he created motors, discovevered the induction of electric currents, and made Faraday's laws of induction. Something like that:)
Eugene A. Klingshirn has written: 'Analytical and experimental study of high phase order induction motors' -- subject(s): Automobiles, Electric, Electric Automobiles, Electric motor vehicles, Electric motors, Induction, Electric propulsion, Equivalent circuits, Induction Electric motors, Induction motors, Stators
Vittorio Isastia has written: 'Sul riscaldamento delle gabbie dei motori asincroni a barra alta in avviamento stazionario' -- subject(s): Induction Electric motors, Windings