Mitsubishi Electric 800 Series Instruction Manual (Function page 103

• It is applicable to fast 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, continuous four-quadrant operations, etc.
• Torque control is enabled
• It allows servo-lock torque control which generates a torque in the motor shaft while stopped. (Not available under Real
sensorless vector control.)
Block diagram of Real sensorless vector control
φ 2
ω *
+
-
ω FB
102
4. Control Method
4.1 Vector control and Real sensorless vector control
Magnetic
id *
+
flux
control
-
id
iq
*
Speed +
control
ω 0
+
ω FB
+
ω s
iq
Slip
calculation
φ 2
Speed estimation
Pre-excitation
Vd
current
control
Torque
Vq
current
control
-
iq
iq
Magnetic
id
flux
Vd
calculation
Vq
PWM
modulation
Output
voltage
conversion
ω 0
id
Current
iq
conversion
I M