Types of Motors I

2. Refers to a three wire Alternating Current (AC) power circuits.
5. The electrical winding in a motor that draws current during the entire running cycle.
6. A motor with run and start windings.
10. This is the maximum back electromotive force (BEMF) that the relay’s coil can tolerate “continuously” without overheating and opening circuit.
13. The difference in the rated rpm of a motor and the actual operating rpm when under a load.
14. A solid-state relay with semiconductors used to stop, start, or modulate power in a circuit.
15. 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.
16. The component in a motor that contains the windings: it does not turn.
17. Unit of current flow.

1. The term used to describe the electrical storage ability of a capacitor.
3. Circuit in which the current lags the voltage.
4. A device that receives the AC supplied by the power company and converts it to variable voltage DC using silicon-controlled rectifiers (SCRs) and transistors that can be turned off and back on in microseconds
7. A motor rotor constructed from bars.
8. 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. A device that surrounds a rotating shaft and provides a low-friction contact surface to reduce wear from the rotating shaft.
11. The twisting force often applied to the starting power of a motor.
12. 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.