HEIDENHAIN iTNC 530 HSCI - Page 1013

July 2013 6.14 Commissioning 1013
Synchronous motor
 Limit of current during field weakening operation
To make sure that the demagnetization current in the field weakening range
does not exceed a permissible value of IDMax, the total leakage inductance
L
Total
= L
Motor
+ L
Reactor
must have the following value:
• U0:No-load voltage of the motor (see U0 in motor.mot) [VeffL-L]
• nN:Rated speed of the motor (see N-N in motor.mot) [min-1]
• nMax:Maximum speed of the motor (see N-MAX in motor.mot) [min-1]
• UZ:DC-link voltage (see MP2190) [V]
• pZ:Number of pole pairs (see PZ in motor.mot)
• IDMax:Maximum demagnetization current [Aeff]
•L
Total
:Total leakage inductance of the drive [µH]
•L
Motor
:Total leakage inductance of the motor [µH]
•IN:
Reactor
current of the motor [Aeff]
The maximum demagnetization current is the no-load current of the motor
during maximum speed, where IDMax ≤ IN.
If the maximum demagnetization current is not known, it can be approximated
by:
• IN: Rated current of the motor [Aeff]
• I0: Continuous standstill current of the motor (see I0 in motor.mot)
[Aeff]
and I0 ≥ IN
 Impermissible temperature of the bearings
L
Total
10
6
U
0
3
---------
n
Max
n
N
-------------------
UZ
6
---------
–⋅
π
30
-------
I
DMax
p⋅
Z
n
Max
⋅⋅
-----------------------------------------------------------------
⋅=
L
DMax
I
0
I
N
I
0
–
n
N
-----------------
n
Max
⋅+=