Types of Motors

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Across
  1. 2. The speed at which the variable frequency drive’s power device switches the waveform’s positive and negative halves on and off is referred to as the switch frequency or carrier frequency.
  2. 7. The switching or transistor section of the variable frequency drive (VFD) that produces an AC voltage at just the right frequency for motor speed control. This section converts the DC voltage back to AC voltage.
  3. 8. The difference in the rated rpm of a motor and the actual operating rpm when under a load.
  4. 11. A compressor starting devices which are variable resistors that vary their resistance when the surrounding temperature changes.
  5. 17. Circuit in which the current lags the voltage.
  6. 18. An electrical storage device used to start motors (start capacitor) and to improve the efficiency of motors (run capacitor).
  7. 19. The amount by which the current leads or lags the voltage.
  8. 20. The minimum back electromotive force (BEMF) that the potential relay coil must experience or its armature will drop out and the contacts between terminals 1 and 2 will close.
Down
  1. 1. This is the voltage-generating effect of an electric motor’s rotor turning within the motor.
  2. 3. A motor rotor constructed from bars.
  3. 4. An alternating current motor where the rotor turns from induced magnetism from the field windings.
  4. 5. A solid-state relay with semiconductors used to stop, start, or modulate power in a circuit.
  5. 6. Circuit in which the current leads the voltage.
  6. 9. A switch that uses a centrifugal action to disconnect the start windings from the circuit.
  7. 10. The back electromotive force (BEMF) voltage that must be generated across the potential relay’s coil to cause the relay armature to move and open the relay contacts between terminals 1 and 2.
  8. 11. A switching device used with hermetic motors that breaks the circuit to the start capacitor and/or start windings after the motor has reached approximately 75% of its running speed.
  9. 12. A motor with run and start windings.
  10. 13. The twisting force often applied to the starting power of a motor.
  11. 14. This is the maximum back electromotive force (BEMF) that the relay’s coil can tolerate “continuously” without overheating and opening circuit.
  12. 15. An electrical device activated by a change in current flow.
  13. 16. The electrical winding in a motor that draws current during the entire running cycle.