HEIDENHAIN MANUALPLUS 620 - Page 1080

1080 HEIDENHAIN Technical Manual MANUALplus 620
Series reactor The inductance of the series reactor is calculated depending on the no-load
current I0:
I0 < 26 A:
I0 ≥ 26 A:
 L: Inductance of the series reactor in µH
 f
PWM
: PWM frequency [Hz]
 X
1
: Stator leakage reactance [mΩ]
 X
2
: Rotor leakage reactance [mΩ]
 f
N
: Rated frequency [Hz]
 U
Z
: DC-link voltage [V]
 I
0
: No-load current [A]
A negative result means that there is no series reactor.
The series reactor must fulfill the following specifications:
 The required inductance (per phase)
 Load capacity with the maximum spindle current
 The inductance even with the maximum spindle speed (operating
frequency)
L
700 µH 5000 Hz U
Z
⋅⋅
f
PWM
600⋅
---------------------------------------------------------
X
1
X
2
+()1000⋅
2 π f
N
⋅⋅
------------------------------------------- -–=
L
700 µH 5000 Hz U
Z
⋅⋅
23,1 I
0
f⋅⋅
PWM
---------------------------------------------------------
X
1
X
2
+()1000⋅
2 π f
N
⋅⋅
------------------------------------------- -–=
Note
If a series reactor is installed later, the current controller must be
readjusted.