Different Dc-Link Voltages - HEIDENHAIN TNC 410 M Technical Manual

7.3 Different DC-Link Voltages

QSY synchronous
motors
7 – 20
The dc-link voltages supplied by HEIDENHAIN inverter systems vary
depending on the type of inverter system.
Non-regenerative compact inverters: 565 V
Regenerative compact inverters: 650 V
Nonregenerative modular inverters: 565 V
Regenerative modular inverters: 650 V
The characteristic curves for the HEIDENHAIN synchronous motors were
determined at a dc-link voltage of 565 V or 650 V.
Operating the synchronous motor at a different dc-link voltage requires a
parallel shift of the voltage limit curve.
The shift is calculated as follows:
U
Znew
Δn = n
– n
old
U
Zold
⋅
Example: U = 565 V, U
Zold
650 V
1
–
Δ ⋅
3300 min ---------------- 3300 min
n =
565 V
+ Δn = 3300 rpm + 497 rpm = 3797 rpm
= n
n
new old
M
Voltage limit curve
for U = 565 V
Z
HEIDENHAIN Technical Manual for Inverter Systems and Motors
old
= 650 V, n
Znew old
1
–
497 min
– =
= 3300 rpm, Δn = ?, n
1
–
Shifted voltage limit curve for
U = 650 V
Z
Δn
n n
old new
= ?
new
n