use of a DC motor? What is Explain the function of the commutator in the open 3.
ID: 2080925 • Letter: U
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use of a DC motor? What is Explain the function of the commutator in the open 3. 15. a b, State three the rat ope 4. ation of a DC motor. of permanent a. How is the direction of rotation a 16. Explain how magnet motor changed? b How is the speed of a permanent-magnet motor armature A motor r controlled? a 5. Summarize the torque and speed characteristics of 4 percent DC series motor. of the mot 6. Why should a DC series motor not be operat b. In what wa without some sort of a load coupled to it? tance affec 7. In what way is the shunt field winding of a shunt motor different from that of the series field winding 18. a. How is the of a series motor? b. How is the 8. Compare the starting torque and load versus speed base speed characteristics of the series motor to those of shunt c. How is the wound motor. base speed How are the series and shunt field windings of the compound wound DC motor connected relative to the armature? 19. With armature what is the eff 10. In what way is a cumulative-compound motor connected? power when th 20. With field curr 11. Compare the torque and speed of a compound motor with those of the series and shunt motors what is the effe 12. How can 21. power when th motor the direction of Field loss prote be rotation of a wound DC motors. Why? 13. Explain changed? 22. List several co how counter EMF is produced in a DC motor. drive woul traditional DC PART 3 Three-phase Alternating made follow the Current Motors Magnetic Field attracted and repelled between AC and DC to turn, it follo stator. stator rotates in is that theExplanation / Answer
3)Explain the function of th communatior in the operation of dc motor?
Answer: The communator can be regarded as a switch thet maintains the proper direction of current in the armature coils to produce constant unidirectional torque
5)Summarize the torque and speed characteristics of a dc motor?
Answer: The DC series motor develops a very high staring torque so it is ideal for starting very heavy mechanical loads .The speed varies widely between no load and rated load
6)Why should a dc series motor not be operated with out some sort of aload coupled to it?
Answer: The speed of the DC motor can increase to the point of damaging the motor
7) In what why is the shunt field winding of a shunt motor different from that of the series filed winding of series motor ?
Answer: The series field winding is constructed of a few turns of heavy gauge wire and has a very low resistance value the shunt field winding is constructed with many turns of much finger gauge wire and has a significantly higher resistance value
3)Explain the function of the commutator in the operation of dc motor?
Answer: The commutator can be regarded as a switch thet maintains the proper direction of current in the armature coils to produce constant unidirectional torque
5)Summarize the torque and speed characteristics of a dc motor?
Answer: The DC series motor develops a very high staring torque so it is ideal for starting very heavy mechanical loads .The speed varies widely between no load and rated load
6)Why should a dc series motor not be operated with out some sort of a load coupled to it?
Answer: The speed of the DC motor can increase to the point of damaging the motor
7) In what why is the shunt field winding of a shunt motor different from that of the series filed winding of series motor ?
Answer: The series field winding is constructed of a few turns of heavy gauge wire and has a very low resistance value the shunt field winding is constructed with many turns of much finger gauge wire and has a significantly higher resistance value
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