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Clarification on inertia calculation

RLetizia
Intellectual 990 points


Hi,

Looking for clarification on MOTION's inertia calculation.

The InstaSPIN user's guide Equation 26 gives the formula for calculating inertia.

1) After calculating USER_SYSTEM_INERTIA using equation 26, is it correct to scale the result as follows before sending to velocity control?

#define ST_SYSTEM_INERTIA_PU (USER_SYSTEM_INERTIA * ST_SPEED_KRPM_PER_PU * (1.0 / USER_IQ_FULL_SCALE_CURRENT_A))

STVELCTL_setInertia(obj->velCtlHandle, _IQ24(ST_SYSTEM_INERTIA_PU));

2) In Equation 26, is the term "φEMF" the value of USER_MOTOR_RATED_FLUX divided by 2pi ?     Where USER_MOTOR_RATED_FLUX = Vpk (phase to neutral)/Hz

Thanks.