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Description of the Software Modules and Parameters
4.4.5
Synchronous motor with interior permanent magnet
Interior Permanent Magnet Synchronous Motors (IPMSM)
The b maXX 3300 can operate synchronous motors with interior permanent magnet
(IPMSM). The IPMSM has nonlinear inductances. Generally the cross-inductance is
greater than the direct axis inductance. These inductances are depending on Id as well
as Iq.
For operation in an optimum way the current controller must be adapted to the inductanc-
es, because the gain of the current controller is directly proportional to the inductances.
The active inductances were gathered directly from the table depending on the current
set values and the current controllers were adapted to these values.
Additionally to the torque of the Lorentz force a reluctance torque exists at the IPMSM
based on the different inductances (T~(Lq-Ld)*Id*Iq). In order to get the maximum torque
for the impressed current (MTPA), also an Id current must be impressed depending on
this torque. The currents were split automatically during controlling, so that always the
highest torque is reached depending on the total current.
4.4.5.1 Control
In
control structure of the BM5000 the current torque set value is assumed the total current
set value compared to the synchronous/asynchronous motor because the ld current ac-
counts for the torque. This way the total current set value from the speed controller is
gained a well and passes through all limits and filtering of the current torque set value.
Then the total current set value is divided in a lq and ld current set value by the motor
constant K. Additionally, the ld current passes the limits of
ZFig. 76–
the structure of the control is applied. In order to integrate the IPMSM in the
Z171.10–
Parameter manual b maXX BM3000
Document no.: 5.12001.07
4
and Z171.11–.
153
of 820
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