Three-phase asynchronous motor

Because the guide was short circuit ring short meet on both ends of the conductor,in under the action

of induction electromotive force,the rotor conductors will be consistent with the direction of

induction electromotive force induced current.Rotor current carrying conductor in the role of the stator magnetic field by electromagnetic force (judge force direction with the left hand rule).Electromagnetic force to the rotor shaft of the electromagnetic torque,driving rotor spinning

in the direction of the rotating magnetic field electric vehicle motor When the three-phase stator winding through the symmetry of three-phase alternating current (ac),creates a to synchronous speed n1 along the circle space inside www.dongfeng- motor.com the stator and rotor be clockwise rotating magnetic field.Due to a rotating magnetic field in the n1 speed rotation,the rotor conductor is still at the beginning,so the rotor conductor will cut the stator rotating magnetic field and induced electromotive force (judge the direction of the induced electromotive force with the right-hand rule).By analyzing the working principle of the motor can be summarized as follows: when the three-phase stator winding of the motor (the difference between a 120 - degree Angle),after the ventilation with balanced three-phase alternating current (ac),will produce a rotating magnetic field,the rotating magnetic field cutting

rotor winding,thus produce induced current in the rotor winding is closed (rotor winding path),the

rotor of current-carrying conductor under the effect of the stator rotating magnetic field will

produce electromagnetic force,as to form the electromagnetic torque on the motor shaft,motor

rotation,and the motor rotation direction is the same as the rotating magnetic field direction. As a

motor running of three-phase asynchronous motor.

Y series three phase asynchronous motor rotor speed

is lower than the speed of the rotating magnetic field,rotor winding due to there is relative motion

between magnetic field and induced electromotive force and the current,electromagnetic torque and

interact with the magnetic field,the realization of energy conversion.Compared with single phase

asynchronous motor,three-phase asynchronous motor operation performance is good,and all kinds of materials can be saved.According motor

fan to the different rotor structure,three-phase asynchronous motor can be divided into

the cage and winding type two kinds.The cage rotor asynchronous motor has simple structure,reliable

operation,light weight,cheap,has been widely used,its main drawback is that control difficult.Wound rotor three-phase asynchronous motor rotor and stator is also set up a three-phase winding and through the slip ring,brush with external resistor connection.Adjust the rheostat resistance can

improve the starting performance of the motor and to adjust the speed of the motor.

Motor power calculation formula

Apparent power S = UI Active power P = UIcos theta Reactive power Q = UIsin theta. The square of the square of the apparent power = active electric vehicle motor power + square of reactive power Motor power calculation formula is: 3 P =) uicos theta eta The P - rated power output shaft of the motor U - rated voltage I - rated current The power factor of cosine Motor vehicle theta - motor Eta, the efficiency of the machine Cosine theta power factor (pf) refers to the consumption of motor power of the ratio of apparent power. Eta motor efficiency refers to the ratio of the output power of active power. Such as active power consumed by an electric motor is 5 kw, and as a result of the motor coil impedance,

 so be electric consumption and fever. www.dongfeng-motor.com The power output 4.5 kw, then its

efficiency is 4.5/5 = 0.9.

YCL Cast Iron Starting Running Capacitor 1 Phase Induction Motor

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