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8.5.1.2
Vector control
Properties of vector control
Vector control has the following properties and features:
● Stability during load and setpoint changes.
● Extremely good control characteristic thanks to short rise times for setpoint changes.
● Very good response to disturbances thanks to short settling times for load changes.
● Acceleration and braking are possible with maximum available torque.
● Motor protection due to variable torque limitation in motor and regenerative mode.
● Drive and braking torque controlled independently of the speed.
These benefits can even be achieved without speed feedback.
Note
Vector control can be used with or without an encoder.
Benefits of vector control with an encoder
A speed encoder is only required in the following conditions:
● A separately excited motor is used.
● Highest speed accuracy is required.
● The most stringent demands on the dynamic response are required.
● Better command behavior is desired.
● The shortest possible settling times during disturbances are required.
● Torque control in a range greater than 1:10 is required.
● A defined and/or variable torque for speeds below approx. 5% of the rated motor frequency
Open-loop and closed-loop control methods (p1300):
● V/f control with linear characteristic.
● I/f control with fixed current.
● Speed control.
● Torque/current control (in short: torque control).
SINAMICS SM150 6SL3845-2NN41-8AD0
Operating Instructions Rev.201908010908 EXAMPLE
(p0310) must be maintained.
Operation
8.5 Functions
107
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