Firmware
≤
11.00 - DMS 8.0 EN - 10/2011
L
191
8400 StateLine C | Reference manual
Motor control (MCTRL)
Sensorless control for synchronous motors (SLPSM)
5.8.5
Pole position identification without motion
This function extension is available from version 11.00.00!
From version 11.00.00 and with sensorless control, the rotor displacement angle for
synchronous motors (SLPSM) is identified with every controller enable in the Lenze setting,
and thus a jerk in the machine after controller enable can be avoided.
The "pole position identification without motion" function is able to identify the electrical
rotor displacement angle with an accuracy of up to 10°. The identification takes 1 ... 15 ms,
depending on the motor. The function is preset in the Lenze setting so that in the majority
of cases no more settings have to be made. In order to obtain the same behaviour as
before, the function can be deactivated in
C02874
.
Short overview of the relevant parameters:
The stator time constants can be calculated based on the following formula:
Parameter
Info
Lenze setting
Value Unit
C02874
Pole position identification
1: On
C02872
PLI: Adaptation of time duration "PLI active"
0
C02875
PLI: Adaptation of identification angle "PLI active"
0 °
C02870
PLI: Degree of optimisation
- %
C02871
PLI: Identification time
- ms
C02873
PLI: Identified rotor displacement angle
- °
Highlighted in grey = display parameter
Note!
In case of synchronous motors with a stator time constant < 1 ms, the pole
position identification is not executed since the resulting test current pulse
could exceed the permissible motor current.
• This, however, only affects very few synchronous motors with very low power
(e.g. Lenze motor MDSKS-020-13-300 with rated power of 40 W).
• A non-executed pole position identification can be recognised by the display
C02870
= 0 % and
C02871
= 0 ms.
T
S
= stator time constant
L
ss
= Motor stator leakage inductance (
C00085
)
R
s
= Motor stator resistance (
C00084
)
T
s
[ms]
L
ss
[mH]
R
s
Ω
[ ]
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=
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