Mitsubishi Electric FR-V560 Instruction Manual page 54

magnetic
φ2
flux
control
ω
*
+ speed
- control
ωFB
+
ωFB
ωs
(1) Speed control
Speed control operation is performed to zero the difference between the speed command (ω*) and actual rota-
tion detection value (ω
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 (ωs) is calculated on the basis of the torque current value (iq) and magnetic flux (φ
quency (w ) is found by adding that slip (ωs) to the feedback (ω
0
The above results are used to make PWM modulation and run the motor.
pre-excitation
*
id
+
-
id
*
iq
+
-
iq
ω0
+
iq
slip
calculation
φ2
magnetic
flux
conversion
). At this time, the motor load is found and its result is transferred to the torque current
FB
*).
q
q *) which is identical to the torque current command (iq) found by
PWM
modulation
Vd
current
output
control
voltage
conversion
torque
Vq
current
control
id
current
iq
conversion
id
) as a predetermined magnetic flux.
2
) found by a feedback from the encoder.
FB
45
What is vector control?
IM
Encoder
ω0
). The output fre-
2
2