A) Asynchronous Motor: Torque Limit Above B) Asynchronous Motor: Overlap Of Several Limits - Baumuller b maXX BM5800 Parameter Manual

3.4
Configuration
Additionally, in the field weakening range the torque is limited by the maximum power.
Therefore, the maximum available torque
In the field weakening range it decreases inversely proportional to the speed (see
33–
Symmetric torque limit
The symmetric torque limit M
controller, which controls the torque-generating current. The correspondent limit for the
torque-generating current I
with
Flux
Kt
upd
Torque limits / torque current limits
M (138.20)
max
| |
m
[Nm]
base speed
range
a)
Figure 33:
If there are several torque limits Z138.22–, that result from the torque current limits
Z138.2–, Z138.3–, Z138.14–,
erating simultaneously then the smallest limit is decisive (compare
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:
82 Parameter manual b maXX BM5800
Document No.: 5.16029.03
of 814
on page 82).
I =
sq limit M
Magnetic flux set value in %
setl
Kt updated Z155.24–, in Nm/A
M (138.22)
Lim
field weakening
N
N -1
n [min ]
N
107.7
a) Asynchronous motor: Torque limit above
b) Asynchronous motor: Overlap of several limits
ZFig. 33–
(b) the "Current mode" is assumed
Z138.20–
(Z138.22–) influences the set value of the torque current
limit
will be fit as follows.
sq limit M
M
limit
------------------------------------------- -

Kt Flux [%]
upd set
Z146.13–
M (138.20) M
max
| |
m
[Nm]
base speed
range
max mech
b)
107.26
Z138.22–
Z138.15–
or from the breakdown torque-current limit op-
is constant in the base speed range.
= (Iq f ) =
Lim Lim
min(138.2,138.3,138.14,138.15)
M (138.22)
Lim
effective
limits
field weakening
N
-1
N
n [min ]
107.7

ZFig. 33–
(Z138.1– bit 3 = 1) with regard to the
Baumüller Nürnberg GmbH
ZFig.
M
=
Lim bd
f(138.18)
N
max mech
107.26
(b)). Note: