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Single Phase Motors > Single Phase Motors Obj.2 > Flashcards

Single Phase Motors Obj.2 Flashcards

1
Q

What are the terminal numbers for the run winding and start winding in a Single Voltage, Split Phase Motor?

A

Run winding T1 & T4
Start Winding T8 & T5

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2
Q

In the LOW Voltage (dual voltage) Split Phase Motor, how is the second run winding connected?

A

In parallel with the other run winding and start winding

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3
Q

In the HIGH Voltage (dual voltage) Split Phase Motor, how is the second run winding connected?

A

In Series with the other run winding
This is so all windings see the same voltage

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4
Q

In the HIGH Voltage (dual voltage) Split Phase Motor, how is the start winding connected?

A

In Parallel with one of the run windings

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5
Q

What are the terminal numbers for the run winding and start winding in a LOW Voltage (dual voltage) Split Phase Motor?

A

Run winding T1 & T2
Run Winding T3 & T4
Start Winding T8 & T5

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6
Q

What are the terminal numbers for the run winding and start winding in a HIGH Voltage (dual voltage) Split Phase Motor?

A

Run winding T1 & T2
Run Winding T3 & T4
Start Winding T8 & T5

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7
Q

In the LOW Voltage (dual voltage) Split Phase Motor I line = ?

A

I line = I winding X2

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8
Q

In the HIGH Voltage (dual voltage) Split Phase Motor I line = ?

A

I line = I winding

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9
Q

How are each of the windings rated in the LOW/HIGH Voltage (dual voltage) Split Phase Motor?

A

Each winding is rated on the lowest voltage on the nameplate

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10
Q

How are each of the windings rated in the LOW/HIGH Current (dual voltage) Split Phase Motor?

A

Each winding is rated on the highest current on the nameplate

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11
Q

What type of protection does the Integral Thermal Protection provide?

A

Overload protection
Required by the CEC

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12
Q

How is the OL Heater sized in the Integral Thermal Protection?

A

It is sized based on the current of ONE Run Winding

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13
Q

What are the physical properties Integral Thermal Protection devices?

A

Contacts are N/C
Usually a Disc Type
Built in device with a manual reset (can be automatic)

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14
Q

What are the three main components of a Two-Valve Cap Motor?

A

Cut Out Switch (centrifugal switch)
Start Cap of higher capacitance
Run Cap

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15
Q

What is another name for a Two-Valve Cap Motor?

A

Capacitor Start
Capacitor Run

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16
Q

What are the physical properties of the windings in the Cap Start and the Cap Run motors?

A

The main and aux windings are identical
For higher starting torque and lower starting current

17
Q

What type of Cap is found in a Cap START Motor?

A

Dry electrolytic type
100 to 300 µF

18
Q

How is the Cap of a Cap START Motor sized?

A

It is sized for a 90° phase shift between I start and I run

19
Q

What is the Cap START Motor rated for?

A

Short duty
Can only allow 20 starts for 3 seconds per hour

20
Q

What is another name for the Cap RUN motor?

A

Permanent Split Capacitor Motor

21
Q

What type of Cap is found in a Cap RUN Motor?

A

Oil filled type
10 to 50 µF

22
Q

Does the Cap RUN have high or low starting Torque?

A

LOW

23
Q

What is the Cap RUN Motor rated for?

A

Continuous duty

24
Q

What are the advantages to having a Cap RUN motor?

A

Quiet motor
Improves PF

25
Q

What are the advantages and disadvantages of a TWO VALVE Cap Motor?

A

High starting torque
Quiet and smooth while running
Low current
Improved Power Factor

Most expensive because of the oil filled caps

26
Q

Is the TWO VALVE Cap reversible or reversing? How?

A

Reversible
Swap T5 and T8

27
Q

What is the Hp range for a TWO VALVE Cap motor?

A

1/4 to 15 Hp

28
Q

How is the Start Cap wired in the TWO VALVE Cap motor?

A

In series with the C.F. switch
In parallel with the Run Cap

29
Q

What type of Cap motor does NOT have a Centrifugal Switch?

A

Cap RUN (permanent split cap)

30
Q

What is the current range during start of a TWO VALVE Cap motor?

A

Cap START = 3.5 - 4.5 FLA

31
Q

What is the torque range during start of a TWO VALVE Cap motor?

A

Cap START = 250% - 450% Rated Torque

Single Phase Motors (2 decks)

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