Mitsubishi Electric FR-V500 Instruction Manual page 52

magnetic
φ 2
flux
control
ω
*
speed
+
- control
ω FB
+
ω FB
ω s
(1) Speed control
Speed control operation is performed to zero the difference between the speed command ( ω *) and actual
rotation detection value ( ω
current controller as a torque current command (i
(2) Torque current control
A voltage (Vq) is calculated to start a current (i
the speed controller.
(3) Magnetic flux control
The magnetic flux ( φ
) of the motor is derived from the excitation current (id). The excitation current command
2
(id*) is calculated to use that motor magnetic flux ( φ
(4) Excitation current control
A voltage (Vd) is calculated to start a current (id) which is identical to the excitation current command (id*)
found by magnetic flux control.
(5) Output frequency calculation
Motor slip ( ω s) is calculated on the basis of the torque current value (iq) and magnetic flux ( φ
) is found by adding that slip ( ω s) to the feedback ( ω
frequency (w
0
The above results are used to make PWM modulation and run the motor.
pre-excitation
id
*
+
-
id
iq *
+
-
iq
ω 0
+
iq
slip
calculation
φ 2
magnetic
flux
calculation
). At this time, the motor load is found and its result is transferred to the torque
FB
*) which is identical to the torque current command (iq) found by
q
PWM
modulation
Vd
current
output
control
voltage
conversion
torque
Vq
current
control
id
current
iq
conversion
id
*).
q
) as a predetermined magnetic flux.
2
) found by a feedback from the encoder.
FB
43
What is vector control?
IM
Encoder
ω 0
). The output
2
2