Mitsubishi Electric FR-A700 Instruction Manual page 249

Parameter
● Speed control
Speed control operation is performed to zero the difference between the speed command
(ω*) and actual rotation detection value (ωFB). At this time, the motor load is found and its
result is transferred to the torque current controller as a torque current command (iq*).
● Torque current control
A voltage (Vq) is calculated to start a current (iq*) which is identical to the torque current
command (iq) found by the speed controller.
● Magnetic flux control
The magnetic flux (φ2) of the motor is derived from the excitation current (id). The excitation
current command (id*) is calculated to use that motor magnetic flux (φ2) as a predetermined
magnetic flux.
● 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.
● Output frequency calculation
Motor slip (ωs) is calculated on the basis of the torque current value (iq) and magnetic flux
(φ2). The output frequency is found by adding that slip (ωs) to the feedback (ωFB) found by
a feedback from the encoder.
The above results are used to make PWM modulation and run the motor.
FR-A700 EC
Control mode
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