Torque Monitoring; Torque Threshold - Baumuller b maXX BM3000 Operating Manual

Description of the Software Modules and Parameters
In
parameters Z138.2–, Z138.3–, Z138.14–, Z138.15–.
Particular case synchronous motor with interior permanent magnet (IPMSM)
The torque is calculated from the characteristic map of the IPMSM and from the currents
according to the following formula:
If a torque limit is entered, the maximum Iq current is recalculated from this equitation,
where the torque limit (Z138.22–) corresponds to the torque T.

4.4.2.3 Torque monitoring

Torque indicator
chine torque is displayed by the maximum available torque Z138.20–. In order to reach
this maximum available torque, the torque-generating current must not be limited via the
parameters Z138.6–, Z138.7–, Z138.14–,
Refer to torque monitoring
between the torque current and the torque.
Particular Case: Synchronous Machine
If the nominal machine working point (rated torque at rated speed) is only reached, if mag-
netizing current is applied to the machine, the following must be considered:
If the magnetizing current in the nominal working point is lower than 10% of the rated mo-
tor current, then the effects on the torque indicator is about 0.5% of the displayed value.
With magnetizing currents of about 20% of the rated current or above, these effects are
significant (deviation is about 2%).
If the required accuracy of torque indicator
recommended, to define the rated data of the synchronous motor at the threshold speed
of field weakening (ID nominal = 0) for unmodified nominal motor current and to enter in
P
nom

4.4.2.4 Torque Threshold

It is possible to define a simple torque threshold. If the absolute value of the effective
torque exceeds this threshold, a status bit is set in parameter
limitation. The relationship between the effective torque of the machine, the set torque
threshold and the status bit is shown in
ZFig. 66–
(b) the "Current mode" is assumed
3
-- - p  
T = I
PM q
2
Z138.21–
Z107.6– Z107.7–.
and n
nom
(Z138.1–
 I 
+ L – L I
d q d q
displays the internal machine torque. The actual possible ma-
Z138.15–
(ZTorque monitoring–
Z138.21–
ZFig.
67–.
Parameter manual b maXX BM3000
Document no.: 5.12001.07
bit 3 = 1) with regard to the
or Z138.22–.
on page 524) for the exact correlation
is critical due to this influence, it is
Z138.25–
4
Status current
113
of 820