Synchronous Reluctance Motors - Siemens SINAMICS S120 Function Manual

Commissioning sequence for closed-loop controlled operation to zero speed:
● Perform the commissioning with motor data identification at standstill.
● Enter the parameters for the saturation characteristic and the load characteristic.
● Activate closed-loop controlled operation down to zero speed via parameter p1750.5 = 1.
The following advantages are obtained by maintaining closed-loop controlled operation:
● No torque irregularities as a result of changeover operations in the closed-loop control
structure
● Closed-loop speed and torque control without encoder (sensorless) up to and including 0
Hz.
● Higher dynamic performance when compared to open-loop controlled operation
● Encoderless operation of drive line-ups (e.g. in the paper industry, master-slave operation)
is possible.
● Active (including hanging/suspended) loads down to zero frequency.
Note
Motor reactor, sine-wave filter, dv/dt filter
The process cannot be used with the present motor reactors, sine-wave filters and dv/dt filters.
6.2.3

Synchronous reluctance motors

Description
Synchronous reluctance motors (RESM) are operated in vector control with/without encoder.
Synchronous reluctance motors are motors that do not have a damping cage. The advantages
of this motor type include:
● No rotor losses
● Energy efficient operation in the partial load range with reduced flux
● Fast magnetization at high load torques
Note
No U/f control
Synchronous reluctance motors must not be operated with U/f control, as this is only intended
for diagnostic purposes.
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
6.2 Vector control without encoder (SLVC)
Vector control
215