T
rated90
20lbf ft
⋅
=
T
rated90
n
s60
n
s90
T
rated
⋅
=
HP
rated90
10hp
=
HP
rated90
HP
60
=
n
s90
2700
min
=
n
s60
1800
min
=
c.
Above rated frequency, the motor operates at rated voltage and current, so rated power can
be produced.
Since the speed increases, rated torque will drop
HP
30
5hp
=
HP
30
30
60
HP
60
⋅
=
T
rated30
30 lbf
⋅
ft
⋅
=
b.
Below rated frequency, the motor can produce rated torque since the flux is constant.
The
hp is directly proportional to frequency
T
rated
30 lbf
⋅
ft
⋅
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 Spring '12
 Piller
 Energy, Power, Volt, 3 lb, lbf⋅ ft

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