INTORQ BFK471-25, Translation Of The Original Operating Instructions

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Technical specifications
INTORQ | BA 14.0200 | 02/2016 18
3.6 Switching energy / switching frequency
Fig. 4 Switching energy as a function of the switching frequency
The permissible switching frequency "S
hmax
" depends on the amount of heat "Q
R
" (refer to Figure 4). At a pre-
set switching frequency "S
h
", the permissible amount of heat is "Q
Smax
".
With high speeds of rotation and switching energy, the wear increases strongly, because very high temper-
atures occur at the friction surfaces for a short time.
A A
Switching energy Q
R
[J]
B
Operating frequency S
h
[h
-1
]
I
BFK471-25 single-rotor
II
BFK471-25 double-rotor
1000 10000
10
2
10
1 10
3
10
4
10
4
10
5
10
2
10
10
3
S
h
[h [h -1 -1 ]
Q
R
[J][J]
A
B
I
II
Shmax
Shue
–
ln 1
QR
QE
---------
–
 
 
 
-------------------------------- =
Qsmax QE 1 e
Shue
–
Sh
-------------------
–
 
 
 
 
 
 
=