Sensorless Control For Synchronous Motors (Slpsm) - Lenze 8400 StateLine C Reference Manual

8400 StateLine C | Reference manual
Motor control (MCTRL)

Sensorless control for synchronous motors (SLPSM)

5.8 Sensorless control for synchronous motors (SLPSM)
This function extension is available from version 10.00.00!
The sensorless control for synchronous motors is based on a decoupled and separated
control of the torque-creating and field-creating current share of synchronous motors. In
contrast to the servo control, the actual speed value and the rotor position are
reconstructed via a motor model.

Stop!
• The sensorless control for synchronous motors is only possible up to a
maximum output frequency of 650 Hz!
– Depending on the number of motor pole pairs, the reference speed
• We recommend to select a power-adapted combination of inverter and
motor.
• The Lenze setting permits the operation of a power-adapted motor. Optimal
operation is only possible if either:
– the motor is selected via the Lenze motor catalogue
– the motor nameplate data are entered and motor parameter identification
– the nameplate data and equivalent circuit data of the motor (motor
• When you enter the motor nameplate data, take into account the phase
connection implemented for the motor (star or delta connection). Only enter
the data applying to the selected connection type.
• In order to protect the motor (e.g. from demagnetisation), we recommend
setting the ultimate motor current in C00939. This ensures motor protection
even with an unstable operation.
• Controller enable is only possible if the motor is at standstill.
– When the controller is enabled, a jerk may occur due to an angle jump since
–
– A flying restart circuit for synchronising to rotating motors is in
174
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(C00011) may only be selected that high that the output frequency
displayed in C00059 is lower than 650 Hz.
is carried out afterwards
- or -
leakage inductance and motor stator resistance) are entered manually.
the rotor displacement angle is not known after controller enable. For
some applications, this jerk in the machine is not acceptable.
From version 11.00.00, the rotor displacement angle is identified with
every controller enable in the Lenze setting, and thus a jerk in the machine
after controller enable can be avoided.
without motion
( 191)
preparation.
L
Maximum current monitoring
Pole position identification
Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
( 242)