# As the load on a synchronous motor increases, the torque angle

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MPSC Assistant Engineer EE Mains 2018 - Paper 1
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1. increases
2. decreases
3. remains the same
4. may increase or decrease

Option 1 : increases
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CT 1: Basic Concepts
18461
10 Questions 10 Marks 6 Mins

## Detailed Solution

• Torque angle δ is the angle between Rotor flux and Stator fluxes, both are rotating at synchronous speed.
• When the synchronous machine is connected to an infinite bus, its speed and terminal voltage are fixed and unalterable.
• The control variables are only field current and the mechanical torque or load on the shaft.
• There is a limit to the mechanical load that can be applied to asynchronous motor.
• As the load is increased, the torque angle δ also increases until the condition arises when the rotor is pulled out of synchronism and the motor is stopped.
• The figure below represents the variation of power P with Torque angle δ.
• This power versus load angle curve has a sinusoidal shape and is usually called the power-angle characteristic curve of the synchronous machine.
• The power P, for the generator is taken as positive and therefore, for the motor as negative.
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