In a synchronous motor hunting occurs due to
WebSep 25, 2024 · When hunting occurs in the alternator, the shifting of armature flux takes place across the pole faces, thereby inducing currents in the damper winding. According to Lenz’s law, the induced current in the winding opposes the cause that produces it. WebHunting can occur in a synchronous motor due to the following reasons: 1. When the load on the shaft of a synchronous motor is suddenly increased or removed or a continuously variable load is applied, 2. If the speed of the prime mover is variable, 3. If the supply frequency is variable, 4.
In a synchronous motor hunting occurs due to
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WebAnswer: When a synchronous motor is loaded then its rotor falls back in phase by the coupling angle ‘alpha’. As load is progressively increased, this angle also increases so as to produce more torque to cope with increasing load. If, now there is a sudden decrease in load then motor is immediatel... WebOct 11, 2024 · When the synchronous motor is loaded, the rotor poles fall back by a certain angle behind the rotating stator poles. This enables the motor to produce the necessary torque to cope up with the load. For synchronous motor operating with fixed excitation, the value of this torque angle is solely decided by the load on the motor.
WebThese are constant losses as the rotor speed is constant in a synchronous generator. There are two types of mechanical losses in an alternator. Friction Losses: In the alternator, friction losses occur in the bearings due to the friction between the rotating part and stationery body. It is given by. PFriction = k N. Web⇒ Hunting in a synchronous motor takes place when supply voltage fluctuates when load varies when power factor is unity motor is under loaded ⇒ If the field of a synchronous motor is under-excited, the power factor will be zero unity lagging leading ⇒ The standard full-load power factor ratings for synchronous motors are zero or 0.8 leading
WebHunting is the phenomenon that occurs in synchronous motors due to varying load or supply frequency. Causes of hunting Periodic variation of load Sudden changes in load Faults occurring in the system when supplied by the generator Sudden change in the field current Cyclic variations of the load torque Effects of hunting WebHunting can occur in a synchronous motor due to the following reasons: 1. When the load on the shaft of a synchronous motor is suddenly increased or removed or a continuously …
WebFeb 24, 2012 · Sometimes it happens because of low supply voltage. But the main reason for starting problem in the motor is because of cogging in which the slots of the stator get …
WebOct 11, 2024 · This oscillatory motion is subsequently superposed upon the uniform synchronous speed of operation. A similar situation will occur when the load on the motor … highgate school goldthorpeWebOct 15, 2024 · The main cause of the hunting or phase swinging in a synchronous motor is due to changing load conditions. Frequent variation of load on a synchronous motor can … high gate ruins locationWebDue to this locking phenomenon the synchronous motor always rotates at synchronous speed so it is always used to satisfy the constant loads but not variable loads because of … highgate safer neighbourhood teamWebEffects of Hunting in Synchronous Motor It may lead to loss of synchronism. Produces mechanical stresses in the rotor shaft. Increases machine losses and cau... highgate school admissions 11+WebSolved Electrical Paper Electrical Machine Biography Electronic In a synchronous motor, during hunting when the rotor speed exceeds the synchronous speed then damper bar … high gate ruinsWebThe Hunting process occurs in a synchronous motor as well as in synchronous generators if an abrupt change in load occurs. The steady state or stable operation of a synchronous … highgate school emailWebDamping due to means other than the main-field ... Cumulative hunting can occur that the damping of a salient-pole machine would be-with positive damping only when the power which sets ... inductive resistance and with a constant input of 6 kw. to the reactance is to increase Xd and Xq by the same amount. synchronous motor. highgate school london news