6-2
Application Manual CDA3000
6 Control modes
Overview of motor control methods
Properties of the motor control methods in comparison
Voltage Frequency Control (VFC):
− Asynchronous motors
− Reluctance motors
− Synchronous motors
− Special motors
• Motor running is controlled by
characteristic
• Voltage of motor is altered
proportional to output fre-
quency of inverter
Sensorless Flux Control (SFC):
− Asynchronous motors
• Calculation of the rotor speed
and the rotor angle from the
electrical variables
• High torque output based on
field orientation (calculation
of the currents to be set)
• High dynamics and smooth
running
• Operation without encoder
Field-Oriented Regulation (FOR):
− Asynchronous motors
• Calculation of the rotor speed
and rotor angle from the
encoder information
• Very high torque output
based on field orientation
(calculation of the currents to
be set)
• Maximum dynamics and
smoothness
• Operation with encoder
Characteristics
VFC
Voltage/Frequency
Control
SFC
Sensorless Flux
Control
FOR
Field-Oriented
Regulation
Torque rise time 20-30 ms < 2 ms < 2ms
Dynamic disturbance correction NO YES YES
Standstill torque NO NO YES
Acceleration torque
1)
1.2
.
MNom 1.8
.
MNom 2
.
MNom
Current usage of inverter 60% 90% 100%
Anti-stall protection limited YES YES
Tabelle 6.1 Motor control method
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