Lenze 8400 motec - Manual (Page 92)

5 Motor control (MCTRL)
5.3 Selecting the control mode
92 Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05
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Sensorless vector control (SLVC)
Sensorless (field-oriented) vector control is based on a decoupled, separate control for the torque-
producing and the field-producing current component. In addition, the actual speed is
reconstructed by means of a motor model so that a speed sensor is not required.
In comparison to the V/f characteristic control without feedback, the following can be achieved by
means of sensorless vector control SLVC:
• A higher maximum torque throughout the entire speed range
• A higher speed accuracy
• A higher concentricity factor
• A higher level of efficiency
• The implementation of torque-actuated operation with speed limitation
• The limitation of the maximum torque in motor and generator mode for speed-actuated
operation

Tip!
If a high torque without feedback is to be provided at small speeds, we recommend the
"Sensorless vector control" motor control mode.

Sensorless vector control (SLVC) ( 122)
Sensorless control for synchronous motors (SLPSM)
From version 03.01.00
This sensorless control enables an encoderless control of synchronous motors. The process is based
on field-oriented control within a higher speed range (e.g. > 10 % of the rated motor speed). The
actual speed value and rotor position are reconstructed via a motor model.
Standard applications for this control type are pumps and fans, horizontal materials handling and
simple positioning technology.
 Sensorless control for synchronous motors (SLPSM) ( 127)