3.1.3.1.1.4.1 Phase to phase inductance of delta winding motors
If the value for phase to phase inductance (also designated as terminal to terminal inductance or line to
line inductance) is available in the motor datasheet, the motor phase inductance for the equivalent star
configuration equals to:
Phase inductance
= Phase to phase inductance
Note
Sometimes motor datasheets do not provide the phase inductance values but instead they provide the
inductance values in direct and quadrature directions (Ld and Lq). In this case, the value of phase
inductance can be calculated from the following equation:
Phase inductance =
(Ld + Lq)
equivalent star configuration
motor datasheet
3.1.3.1.1.5 Errors in phase resistance and inductance
Wrong values of the parameters phase resistance or phase inductance will affect the quality of the current loop
controllers:
narrower bandwidth
less stability margins
Note
Internal algorithms prevent degradation of the steady state operation when the error is less than 20%
of the exact value.
3.1.3.1.1.6 Motor phases inverted
This parameter depends on the order in which the motor terminals are connected to the inverter terminals.
It can be either “normal” or “inverted”. Details can be found in
. This parameter
is detected automatically when the sensor offset measurement procedure is triggered.
If Motor phases inverted is set wrong (manually), the following problems might appear:
Wrong motion polarity (positive “torque target” resulting in negative “motor generated torque”).
Low efficiency of motor
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