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Electric Motors Q/A Solved
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Electric Motors Q/A Solved
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Electric Motors Q/AThe two popular operating voltages for residence are - 115 and 230 volts
When an open motor gets up to speed the start switch - takes the start
winding out of the circuit.
The start windings resistance is - The start windings resistance is greater
than that of the run winding
The start capacitor is - wired in series with the start winding for more
starting torque.
A run capacitor - A run capacitor improves the running efficiency of the
split phase motor
what is BEMF - Back electromotor force - The large metal mass of the
rotors motor turning at high speeds with the motor windings in close
proximity has a voltage generating effect this is greater across the start
winding because it is wound with longer thinner wire. It is often referred to as
inductive voltage or BEMF
why is a compressor motor manufacture from special material - Because
the compressor motor materials must be compatible with the refrigerant and
oil circulating in the system
Two types of motors used for hermetic compressors are - Refrigerant gas
cooled and air from a fan cooled
why cant a centrifugal switch be used inside a hermetic compressor - A
spark will deteriorate the refrigerant, so the leads must pass thru the
compressor shell to the outside
Two types of relays to start hermetic compressors are - The potential
relay and the Current relay
A PTC device is used - with some PSC motors to give small amounts of
starting torque.
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