Mitsubishi Electric FR-A700 Instruction Manual page 247

Parameter
Motor-generated torque (TM), slip angular velocity (ωs) and the motor's secondary magnetic
flux (φ2) can be found by the following calculation::
TM ∼ φ2 × iq
φ2 = M × id
r2
ωs
------ -
=
L2
where, L2 = secondary inductance
L2 = l2 + M
Vector control provides the following advantages:
● Excellent control characteristics when compared to V/f control and other control techniques,
achieving the control characteristics equal to those of DC machines.
● Applicable to high-response applications with which induction motors were previously
regarded as difficult to use. Applications requiring a wide variable-speed range from
extremely low speed to high speed, frequent acceleration/deceleration operations, continu-
ous four-quadrant operations etc.
● Allows torque control.
● Allows servo-lock torque control which generates a torque at zero speed (i.e. status of motor
shaft = stopped). (Cannot be performed under real sensorless vector control.)
FR-A700 EC
iq
×
---- -
id
Control mode
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