Siemens SINAMICS G220 - Page 520

Description of function
The "Encoderless speed control of the synchronous reluctance motor from standstill" function
uses an optimized pulse technique for speeds close to 0.
The technique makes it possible to determine the rotor position and speed until standstill is
reached.
The following 󹪝gure gives a qualitative illustration of the di󹪜erences in the actual speed value
and actual current value with and without the "Motor Control Extended" software option.
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① Transition from open-loop controlled into closed-loop controlled operation of the motor
② Transition from closed-loop controlled into open-loop controlled operation of the motor
Figure14-120 Typical motor response with and without software option
Without the "Motor Control Extended" software option, the motor is in open-loop controlled
operation at speeds close to 0.
The "Motor Control Extended" software option enables the closed-loop controlled operation
of the motor until standstill is reached.
Functions
14.10Closed-loop drive control
SINAMICS G220 converter
518 Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB