What is the FLA rating of motor? a. What is the significance of multiple FLA rat

Question

What is the FLA rating of motor?
a. What is the significance of multiple FLA ratings if you have them?

c. What motor design factors affect the FLA of a given motor?

7. What is the RPM rating of motor?
a. Why does the motor turn at this RPM
b. What design factors affect synchronous and nameplate RPM?
c. Will the RPM change with load? Why?
d. How can the RPM of motor be changed?
e. If RPM is changed what impact will this have on motor operation such as current, torque,
horsepower, etc?
f. If RPM is changed what other variable must also be changed to keep the motor from overheating.

Explanation / Answer

ANSWERS:

What is the FLA rating of motor?
The nameplate FLA is used to select the correct wire size, motor starter, and overload protection devices necessary to serve and protect the motor.

a. What is the significance of multiple FLA ratings if you have them?

c. What motor design factors affect the FLA of a given motor?

As the torque load on a motor increases, the amperage required to power the motor also increases. When the full-load torque and horsepower is reached, the corresponding amperage is known as the full-load amperage (FLA). This value is determined by laboratory tests; the value is usually rounded up slightly and recorded as the nameplate value. Rounding up allows for manufacturing variations that can occur and some normal voltage variations that might increase the full-load amps of the motor

7. What is the RPM rating of motor?

Ravoluation Per Minute, RPM is described as the motor rotate how many time in one minute.

a. Why does the motor turn at this RPM

Because of this RPM is rated RPM of motor and mentioned on nameplate. It is desinged to rotate at this RPM by manufacturer.

b. What design factors affect synchronous and nameplate RPM?

The formula is: N =120*f/P

so here synchoronous and nameplate RPM is affected by frequency and Pole of motor.

c. Will the RPM change with load? Why?

Because of excess burden of load, RPM slightly change and suddenly motor draw more current to reach rated RPM.

d. How can the RPM of motor be changed?

The RPM of motor can be change by changin the input frequency of motor. N = 120*f/P

e. If RPM is changed what impact will this have on motor operation such as current, torque,
horsepower, etc?

If RPM is changed it is definately effect all paramenter.

RPM directly porpotional to current. let load is increased and motor will get more speed to constant their RPM by drawing more current.

RPM inversally porpotional to Torque. Let if RPM is slow so it could be more powerful, like a engine of car when you have in first gear you have more power from engine and if your car is on full speed so you engine thurst is minor.

RPM inversally porpotional to hours power.

How much RPM is low it can draw more power but if it has high RPM it definately has low hourse power.

f. If RPM is changed what other variable must also be changed to keep the motor from overheating.

If RPM is changed, the load must be reduced to avoiding the overheat the motor. If motor is full loaded and RPM is very much slow then motor can be overheated and vice versa.

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