EE6703 Special Electrical Machines Important questions
EE6703 Special Electrical Machines Important questions Regulation 2013 Anna University free download. Special Electrical Machines EE6703 Important questions free pdf download.
Sample EE6703 Special Electrical Machines Important questions:
1. What is synchronous reluctance motor?
A reluctance motor is a type of synchronous electric motor which induces nonpermanent magnetic poles on the ferromagnetic rotor. Torque is generated through the phenomenon of magnetic reluctance.
The stator consists of multiple salient (ie. projecting) electromagnet poles, similar to a wound field brushed DC motor. The rotor consists of soft magnetic material, such as laminated silicon steel, which has multiple projections acting as salient magnetic poles through magnetic reluctance. EE6703 Special Electrical Machines Important questions
The number of rotor poles is typically less than the number of stator poles, which minimizes torque ripple and prevents the poles from all aligning simultaneously — a position which can not generate torque.
2. Define the characteristics of synchronous reluctance motor.
The synchronous reluctance motor is not self starting without the squirrel cage. During run up it behaves as an induction motor but as it approaches synchronous speed, the reluctance torque takes over and the motor locks into synchronous speed.
3. Write the applications of syrm.
Used where regulated speed control is required in applications suc as metering pumps and industrial process equipment. (EE6703 Special Electrical Machines Important questions)
4. What are the classification of syrm
Axially laminated
Radially laminated
5. What are the primary design consideration of syrm?
High o/p power capability
Ability of the rotor to withstand high speed.
High reliability
Low cost
High efficiency
6. Define power factor of syrm
PF max=(Ld/Lq-1)/(Ld/Lq+1)
Higher Ld/Lq ratos yield higher power factors,which corresponds to reduced I^2R losses and reduce volt ampere ratings of the inverter driving the machine. (EE6703 Special Electrical Machines Important questions)
7. What are the applications of the torque – speed characteristics of syrm?
Comparable power density but better efficiency than induction motor
Slightly lower power factor
Sensorless control is much easier due to motor saliency.
(EE6703 Special Electrical Machines Important questions)
| Subject Name | Special Electrical Machines |
| Subject Code | EE6703 |
| Regulation | 2013 |
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