Rockwell-automation SA500 Drive Configuration and Programming Uživatelský manuál stáhnout pdf (Strana 119)

Calculating Slip Gain, Torque Gain, and Stator Inductance

F-1

PPENDIX

Calculating Slip Gain, Torque Gain,

and Stator Inductance

For motors not in the pulldown menu, calculate the slip gain, torque gain, and stator

inductance for the motor using the following formulas. FOR THE INFORMATION

NEEDED, USE THE DATA FROM THE MOTOR DATA SHEETS. Most errors occur in

the calculation of the slip gain parameter.

F.1 Slip Gain

Where P_base = Rated Motor Power (W) (1HP = 746W)

W_base = Rated Full Load Speed (rpm)

Pn = Number of Motor Poles (NOT POLE PAIRS)

fo = Rated Motor Frequency (Hz)

K_slip = (rad/Sec Nm)

The above calculation is based on a 2-pole machine. If the motor has more than 2

poles (4, 6, 8 …), reduce the slip gain by a factor of (2/Pn).

After calculating the slip gain, use 80% of the calculated value as a starting point for

the tuning since the motor is not at maximum temperature. The slip gain may need to

be increased if the motor temperature nears maximum.

2∗

∗W_base

W_base∗2∗

∗

2∗

∗fo –

60∗P_Base

K_slip =

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Rockwell-automation SA500 Drive Configuration and Programming Uživatelský manuál Strana 119