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Control method
Parameters
5 - 40
PM motor control
●
Highly efficient motor control and highly accurate motor speed control can be performed by using
the inverter with a PM (permanent magnet embedded) motor, which is more efficient than an
induction motor.
●
The motor speed is calculated based on the output voltage and current from the inverter. It does
not require a speed detector such as an encoder. The inverter drives the PM motor with the least
required current when a load is applied in order to achieve the highest motor efficiency.
●
Performing the IPM parameter initialization makes the IPM motor MM-EFS or MM-THE4 ready for
the PM motor control.
A magnetic field observer is a control method that calculates the motor speed/magnetic pole
position based on the motor voltage and current of a virtual motor which is set up in the inverter.
I003014E
Fig. 5-1:
PM motor control image
NOTES
The PM motor control requires the following conditions.
●
The motor described in the table below is used.
●
For the motor capacity, the rated motor current should be equal to or less than the inverter
rated current. (It must be 0.4 kW or higher.)
Using a motor with the rated current substantially lower than the inverter rated current will
cause torque ripples, etc. and degrade the speed and torque accuracies. As a reference, select
the motor with the rated motor current that is about 40% or higher of the inverter rated current.
●
Single-motor operation (one motor to one inverter) is performed.
●
The overall wiring length with the motor is 100 m or less. (Refer to page 2-43.) (Even with the IPM
motor MM-EFS, MM-THE4, when the wiring length exceeds 30 m, perform offline auto tuning.)
●
A surge voltage suppression filter (FR-ASF/FR-BMF) or sine wave filter (MT-BSL/BSC) is not used.
Output
voltage
PM motor control image
Inverter
Speed
command
Controller
Inverter
circuit
Output
current
Magnetic field observer
Virtual motor
Speed/magnetic
pole position
Motor
Condition
Mitsubishi IPM motor (MM-EFS, MM-THE4)
Offline auto tuning is not required
IPM motor (other than MM-EFS, MM-THE4), SPM motor
Offline auto tuning is required
Содержание FR-F820-00046
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Страница 114: ...System configuration for Ethernet communication FR F800 E Installation and wiring 2 86 ...
Страница 172: ...Basic operation procedure JOG operation Basic operation 4 32 ...
Страница 812: ...Inverter to inverter link function FR F800 E Parameters 5 640 ...
Страница 874: ...Measurement of main circuit voltages currents and powers Precautions for maintenance and inspection 7 20 ...
Страница 900: ...Outline dimension drawings Specifications 8 26 ...
Страница 928: ...EC Declarations of Conformity Appendix A 28 A 6 EC Declarations of Conformity A 6 1 FR F820 FR F840 FR F842 series ...
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