E283C6 - Chapter 6: Synchronous Motor In general, a...

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Chapter 6: Synchronous Motor In general, a synchronous motor is very similar to a synchronous generator with a difference of function only. Steady State Operations A synchronous motor are usually applied to instances where the load would require a constant speed. Hence for a synchronous motor, its torque speed characteristic is constant speed as the induced torque increases. Hence SR = 0%. Since, sin 3s i n ind R net A ind ms kB B VE X φ τ δ ω = = Maximum torque (pullout torque) is achieved when sin δ = 1. If load exceeds the pullout torque, the rotor will slow down. Due to the interaction between the stator and rotor magnetic field, there would be a torque surge produced as such there would be a loss of synchronism which is known as slipping poles . Also based upon the above equation, maximum induced torque can be achieved by increasing E a hence increasing the field current. Effect of load changes Assumption: A synchronous generator operating with a load connected to it. The field current setting are unchanged. Varying load would in fact slow the machine down a bit hence increasing the torque angle. Due to an increase to the torque angle, more torque is induced hence spinning the synchronous machine to synchronous speed again.
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E283C6 - Chapter 6: Synchronous Motor In general, a...

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