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Pony motor is basically
Induction motor
DC series motor
DC shunt motor
None of above
Induction motor
A pony motor is an auxiliary induction motor used to bring a synchronous motor up to its synchronous speed before synchronization. Since standard synchronous motors are not self-starting, the pony motor provides the initial torque required to overcome inertia.
A pony motor is an auxiliary induction motor used to bring a synchronous motor up to its synchronous speed before synchronization. Since standard synchronous motors are not self-starting, the pony motor provides the initial torque required to overcome inertia.
NsтАЛ=P120fтАЛ тАФ where NsтАЛ is the synchronous speed, f is frequency, and P is the number of poles.
The pony motor is mechanically coupled to the shaft of the synchronous motor. Once the synchronous motor reaches a speed slightly above or equal to synchronous speed (NsтАЛ), it is synchronized with the AC supply. After synchronization, the pony motor is typically decoupled or turned off, and the synchronous motor takes over the load.
Synchronous motors lack inherent starting torque.
Induction motors are used as pony motors due to their robust starting characteristics.
The pony motor must be slightly faster than the synchronous motor to achieve pull-in torque.
Used in large industrial synchronous motors and frequency converters.
Allows synchronous motor to start without additional dampers.
High starting efficiency for large industrial motors.
Requires extra mechanical coupling.
Additional maintenance and cost due to an extra machine.
Large industrial synchronous motors.
Power system frequency converters.
Other methods of starting synchronous motors include using Damper windings or operating the motor as an Induction Motor at start.
Option B and C are incorrect because DC motors lack the necessary speed control for synchronizing with AC power grids directly without complex power electronics.
A is correct тАФ A pony motor is essentially an induction motor utilized as an auxiliary starter to bring a synchronous motor up to its rated synchronous speed.
Always remember that in large synchronous motors, the pony motor is preferred when the mechanical load is high, as it prevents excessive heating of the main motor windings during starting.