Lenze i700

Lenze · i700 servo inverter · reference manual · DMS 3.0 EN · 06/2016 · TD06 102
5 Motor control & motor settings
5.10 Synchronous motor (SM): Pole position identification
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Functional description
[5-1] PLI function (360°)
If the servo control for synchronous motor is set and if no error is pending, the current is increased to 141 % of the
rated motor current along a ramp first after controller enable.
Left image
First, the rotor is moved from its optional position of rest to the 0° angle.
• For this purpose, the amplitude of the d current vector in the stator coordinate system is built up at a starting
angle of 45° and then turned to 0°.
• A sufficiently high amplitude of the d current vector and its rotary motion result in a magnetic force that moves
the rotor to the angle 0°.
Right image
Afterwards, the d current vector is turned further in 15 steps by 22.5° each starting at the angle 0°.
• The rotor adjusts itself to the corresponding angle due to the magnetic forces.
• After 16 steps, the rotor has moved electrically by absolute 360°.
Result
For determining the pole position, a mean value is calculated from all 16 messages.
The rotor displacement angle can be recorded via the 0x2DDE
object (actual motor rotor angle position).
The detected pole position is stored in the i700 object 0x2C03:2
, 0x2C03:4 and then has to be saved in the PLC
project.
Abort of the pole position identification
The pole position identification is aborted if the deviations between the rotary motion of the current vector and the
rotor exceed the error tolerance set in 0x2C41:4
.
0° a
22.5°
45°45°
67.5°
90°
b
112.5°
135°
157.5°
180°
202.5°
247.5°
270°
292.5°
337.5°
d
q
225°
315°
0°
a
q b