Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
203
The motor connected to a vector control is simulated in a vector model based on data from
the equivalent circuit diagram. The motor module is emulated as precisely as possible to
obtain the best results regarding control precision and control quality.
There are 2 types of vector control:
● Vector control without encoder (Page 209) (SLVC) as frequency control
● Vector control with encoder (Page 219)as speed-torque control with speed feedback
Properties of vector control:
● Normal computing speed
● Best speed accuracy
● Best speed ripple
● Best torque accuracy
● Best torque ripple
Vector control can be used with or without a speed encoder.
A speed encoder is required if the following criteria apply:
● High speed accuracy is required
● High dynamic response requirements
– Better control behavior
– Better response to disturbances
● Torque control is required in a control range greater than 1:10
● A defined and/or variable torque should be maintained for speeds below approx. 10% of
the rated motor frequency (p0310).
With regard to setpoint input, vector control is subdivided into:
● Speed control
● Torque/current control (in short: torque control)
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