Engineering Guide CDA3000
3-65
3 Selection of inverter module
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Project planning notes for three-phase AC motors
3.3.2 Efficiency of the
motor control
methods
During commissioning of the inverter module three different motor control
methods can be selected. The asynchronous motor is identified automati-
cally by the inverter module based on the “plug-and-play” principle. All
control loops are optimized in the process.
Voltage Frequency Control (VFC)
With VFC the voltage of the motor is modified proportional to the output
frequency of the inverter module. This method is particularly suitable for
reluctance motors, synchronous motors and special motors.
Sensorless Flux Control (SFC)
The new control method SFC, applicable to asynchronous motors, calcu-
lates the rotor speed and the current angle of the rotor from the electrical
variables. Based on the calculated information, the currents to form the
torque can be fed into the motor in a favorable way. In this way, outstand-
ing control characteristics are attained even without the use of a cost-
intensive encoder.
Motor type
Project planning notes
Standard three-
phase AC motor
See section 2.5.1 and 3.3
Asynchronous
servomotor
See section 2.5.2
Displacement-
type
armature motor
In a displacement-type armature motor the brake is ventilated by the
magnetic field of the motor. The motor must always be run with the VFC
control method. The “Current injection” software function must be
adapted.
Note:
A high current flows when the motor is idling. Operation at low
speeds is only permissible for short periods of time.
Reluctance motor
The reluctance motor is a special motor which must be tested anew
prior to every production deployment (See section 2.5.3).
Synchronous
motor
The synchronous motor is likewise a special motor which must be tested
anew prior to every production deployment (See section 2.5.4).
High-frequency
motors
(HF motors)
HF motors are usually run with constant torque, at high frequencies up
to 1600 Hz. For more information See section 2.5.5.
Table 3.30
Project planning notes for synchronous and asynchronous
three-phase AC motors
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Страница 315: ...A 24 Engineering Guide CDA3000 Appendix A Formula bank Movement by rack Movement by cable reel Movement by spindle ...
Страница 317: ...A 26 Engineering Guide CDA3000 Appendix A Formula bank Indexing table with eccentric loads ...
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