Synchronous motors.txt

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johnbowens
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125478
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Synchronous motors.txt
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2011-12-31 16:20:23
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IBEW JATC inside electrical synchronous motors
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ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors
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  1. A synchronous motor is a motor that rotates at the same speed as what? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 132
    This motor rotates at exactly the same speed as the rotating magnetic field of the stator.
  2. What type of motor is used with loads that require constant speed? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 132
    Synchronous motors are used with these types of loads.
  3. This type of motor is used for applications where a NEMA class B motor is desired. ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 132
    Synchronous motors are used with this NEMA class.
  4. The rotor field winding in a synchronous motor is excited by what? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 132
    This is excited by the external DC power source in a synchronous motor.
  5. If the synchronous motor is overloaded to the point where the rotor is pulled out of step with the rotating magnetic field...
    ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 133
    The armortisseur winding will now see relative motion and torque will be produced by the Armortisseur winding until the OSR, which is the current relay, trips the stator off-line or the motor resynchronizes.
  6. The stator of a synchronous motor is constructed how? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 133
    The stator of this motor is constructed like the stator of any polyphase motor, with the field coils placed in slots 120 electrical degrees apart.
  7. Why is the stator constructed of laminated our sheets in a synchronized motor? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 132
    This type of motor stator must be constructed in this way to minimize eddy current losses.
  8. A synchronous motor has a how many part rotor? What are these parts? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 134
    A two-part rotor with an induction-rotor section and a wound-rotor section in this type of motor.
  9. Starting a synchronous motor as an induction motor requires this? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 134
    This type of motor requires Armortisseur windings to start.
  10. What is also referred to as damper windings In a synchronous motor? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 134
    Armortisseur windings is another name for this.
  11. In a synchronous motor the number of rotor fields must equal what? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 134
    In this motor the number of rotor fields must equal the number stator field poles.
  12. In a synchronous motor, the wound rotor section consists of field windings wrapped around what? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 134
    • In this motor the wound rotor section consists of field windings wrapped around salient poles.
  13. What is it called when the DC excitation is applied to the rotor, creating an electromagnetic field with North and South poles locked with the revolving field of the stater? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 135
    This is called locked in step, in a synchronous motor.
  14. What statement describes a motor where no eddy currents are induced in the iron? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 135
    A synchronous motor.
  15. Why is the syncronous rotor also assembled from iron laminations? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 135
    The heat induced into the core as a result of the eddy currents is detrimental to the service life of the motor.
  16. Synchronous motors that typically run faster than this RPM are considered high-speed synchronous motors? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 135
    more than 450 RPM.
  17. The _______ of a synchronous motor has a DC field winding that creates electromagnetic fields. ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 135
    The rotor of a synchronous motor does this.
  18. What type of synchronous motor designs do not include the armortisseur windings? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 136
    Synchronous condensers do not include these.
  19. In a synchronous motor, motors running at lower speeds with decreased centrifugal force compared to a high-speed rotor design, the spider ring is what? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 136
    The spider ring in a synchronous motor that is low-speed is a hollow cylinder.
  20. Some synchronous motor designs for synchronous condensers do not include what? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 136
    These motors sometimes do not include the armortisseur.
  21. What is also called a small DC motor? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 136
    A pony motor is sometimes called this.
  22. When a synchronous motor is started up it operates as what? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 137
    Upon start up this motor operates as an induction motor.
  23. At approximately what speed does the synchronous motor create DC excitation applied to the wound rotor section? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 137
    At pproximately 95% of synchronous speed, a synchronous motor creates this.
  24. In regards to a DC excitor generator, the polarity of the slip rings is, or is not, Critical? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 137
    The polarity of the slip rings is not critical in this.
  25. In A DC exciter generator the negative polarity slip ring typically weats faster than the positive ring due to what? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 137
    Electrolysis causes this: because of this the ring should be reversed periodically to equalize the wear.
  26. The DC power to the synchronous motor is often supplied by what? Located where? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 138
    • This is supplied by the exciter generator mounted on the end of the synchronous motor shaft.
  27. A DC shaft mounted excitor generator typically is what? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 138
    • Shunt or compound wound DC generator with the Armature in parallel with the shunt field and it shunt field rheostat.
  28. A DC shaft mounted exciter generator voltage is usually not higher than what voltage and the KW capacity of the excitor generator usually ranges from approximately what? PP 138
    This is seldom more than 250V and the KW capacity is from 1 to 3% of the synchronous motor rating.
  29. What is the motor generator set (MG)? ATP & JATC, Motors 2nd edition, 2010: Chapter 7 Synchronous motors, PP 138
    A motor and a generator with shafts connected and used to convert one form of power to another form.

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