Single Phase Motor Review

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

6 pole?

1200rpm

4 pole?

1800rpm

A motor has a voltage rating of 210 - 240 what would be the minimum and maximum voltages that could be applied to this motor?

200-264 volts

What is the synchronous speed of a single phase two pole 60hz AC motor?

3600rpm (60 cycles x 60 sec/min)

8 pole?

900rpm

How does a PTC relay work? PTC = Positive Temp Coefficient

As temperature rises, resistance increases

Two capacitors connected in series C1 = 15mfd, 220 volts, C2 = 20mfd, 220 volt. The total capacitance would be?

C = C1 x C2 / C1 + C2 NOTE: Resistors in Parallel = 15x20 / 15+20 C = C1 + C2 / C1 x C2 = 300 / 35 = 8.57

What does C.S.R stand for ?

Capacitor start capacitor run

What does C.S.I.R stand for ?

Capacitor start induction run

FLA

Full Load Amps (on an open motor)

The current in the run winding always _____ the current in the start winding because

LAGS - bc of the higher XL on run than start winding

The marked terminal of a run capacitor is connected to the _____ as the terminal is closest to the _______ of the capacitor

Line and Shell

LRA

Locked Rotor Amps (4-6 times of the FLA/RLA)

What type of motor would you use for a cap tube metering device?

Permanent Split Capacitor (PSC) ***min. cycle time 3min

What is the purpose of the bleed resistor on a start capacitor when used with a potential relay?

Protect the contacts in the potential relay from arching

RLA

Rated Load Amps (on compressor) -basically the same as FLA

How would you reverse the rotation of a split phase motor?

Reverse the wires on the start winding

The run capacitor of a PSC motor is always connected in _________ with the start winding and in ___________ with the run winding

Series and Parallel

List 5 Motors and their starting torque

Shaded Pole (40-50%) Split Phase (100%) Permanent Split Capacitor (50-80%) Capacitor Start Induction Run (up to 300%) Capacitor Start Capacitor Run (up to 300%)

In a split phase or PSC motor which of the windings has the highest resistance?

Start Winding

What does PSC stand for ?

permanent split capacitor


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