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Questions and Answers
What creates a rotating magnetic field in an induction motor?
What causes the rotor to turn in an induction motor?
What is slip in an induction motor?
What determines the synchronous speed of an AC motor?
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What is the typical speed-torque relationship of a standard NEMA Design B polyphase induction motor?
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What is the slip range at full rated load for small or special purpose motors?
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Can an induction motor be used as an induction generator?
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What happens to the motor as load torque increases beyond breakdown torque?
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Study Notes
- A three-phase power supply creates a rotating magnetic field in an induction motor.
- The induced currents in the rotor windings create magnetic fields that react against the stator field, causing the rotor to turn.
- The rotor in an induction motor always operates slightly slower than synchronous speed, creating a slip.
- An induction motor can be used as an induction generator or unrolled to form a linear induction motor.
- The synchronous speed of an AC motor is determined by the frequency of the power supply and the number of magnetic poles.
- The number of magnetic poles in the rotor is equal to the number of magnetic poles in the stator.
- Slip is defined as the difference between synchronous speed and operating speed, determining the motor's torque.
- At full rated load, slip varies from more than 5% for small or special purpose motors to less than 1% for large motors.
- The typical speed-torque relationship of a standard NEMA Design B polyphase induction motor is linear or proportional to slip.
- As load torque increases beyond breakdown torque, the motor stalls.
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Description
Test your knowledge of induction motors with this quiz! From the basics of how they work to their various applications, this quiz covers everything you need to know about induction motors. Keywords include three-phase power supply, rotor windings, slip, synchronous speed, magnetic poles, torque, and NEMA Design B. See how much you know about this important technology by taking this quiz now!
