KEB F6 - Page 106

Parameter Descriptions
106
© 2024 KEB America, Inc.
Example:
The motor nameplate reads 95 rpm, 15 Hz.
Solving for the number of motor poles, we get:
# of Motor Poles = Rated Frequency (Hz) x 120 / Rated Speed (rpm)
= 15 Hz x 120 / 95 rpm
= 18.94 Motor Poles
Here, the number of motor poles is approximately 19. The number is not even. This
would indicate either the motor rated speed or frequency listed on the nameplate was
incorrect. Additionally, it cannot be determined whether the correct number of motor
poles should be either 18 or 20. In this case, contact the motor manufacturer to confirm.
For this example, assume the motor manufacturer confirmed the number of pole pairs to
be 20. With this, we can assume either the rated motor speed of 95 rpm is correct, or the
rated motor frequency of 15 Hz is correct, then solve for the other. Here, we will choose
the 95 rpm to be correct and solve for the rated motor frequency, given a 20-pole motor:
Rated Frequency (Hz) = Rated Speed (rpm) x # of Motor Poles / 120
= 95 x 20 / 120
= 15.8 Hz
Or, equivalently if the rated motor frequency is assumed to be 15 Hz.
Rated Speed (rpm) = Rated Frequency (Hz) x 120 / # of Motor Poles
= 15 x 120 / 20
= 90 rpm
LM03 Motor Current
The rated motor current in amperes, according to nameplate.
Motor Type
Range
Units
Default
Pass
Level
Ind.
PM
Min.
Max.
Imp.
Met.
RW
RW
1
1000
A
-
1
Basic