There a lot of things we can do if we can control and manipulate the motor. Here is the most important formula when you come to play with the a.c motor.
VALUE

1PHASE

3PHASE


WATTS (W)

I X E X PF

I X E X 1.73 X PF


KILOWATTS (kW)




AMPERES (I)




KILOVOLT AMPERES
(kVA)




FREQUENCY (Hertz or
f)




RPM (n)




NUMBER OF ROTOR
POLES (P)




POWER FACTOR (PF)




HORSEPOWER (HP)




AMPERES (when kW is
known)




AMPERES (when kVA is
known)



I

=

current in amperes

E

=

voltage in volts

W

=

watts

kW

=

power in kilowatts

kVA

=

apparent power in kilovoltamperes

HP

=

output power in
horsepower

RPM (n)

=

motor speed in revolutions per minute
(RPM)

ns

=

synchronous speed in
revolutions per minute (RPM)

Rotor Poles (P)

=

number of poles

Hertz (f)

=

frequency in cycles
per second (CPS)

T

=

torque in poundfeet

EFF

=

efficiency as a
decimal

PF

=

power factor as a decimal

HP

=

horsepower

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