Lust CDA3000 - Page 63

2-30
Engineering Guide CDA3000
2 Drive definition
Dependencies of the motor variables in inverter operation
Limit frequency in inver-
ter operation
f
G
f
N
M
K
M
N
-------


07,⋅⋅≈
Variable
Referenced
variable
Characteristic of referenced variable
Constant flux Field weakening
M=const.
P
2
=
const.
Speed [n]
Voltage [U]
Flux [
Φ
]
Current [I]
Torque [M]
Breakdown torque
[M
k
]
Mechanical
output [P
2
]
Slip [s]
Stator
copper loss [P
cu1
]
Rotor
copper loss [P
cu2
]
Core loss [P
Fe
]
Table 2.4 Dependencies of the motor variables
P
2
1
n
--
∼
n
n
N
-----
1
0
f/f
N
f/f
N
f/f
N
1
1
1
0
f/f
N
1
1
1
1
1
f
N
/f
f
N
/f
f
G
/f
0
0
f
N
/f
(f
G
/f) ²
1
1
0
(f
N
/f) ²
(f
N
/f) ²
1
1
0
f/f
N
f
G
/f
1
1
0
f
G
/f
1
1
0
f
N
/f
(f
G
/f) ²
1
1
1
0
(f
G
/f) ²
1
1
1
0
f
N
/f
f
N
/f
(f/f
N
)
3/2
1
0
0
f
N
f
G
f
U
U
N
-----
Φ
Φ
N
-------
I
I
N
----
M
M
N
-------
M
k
M
kN
---------
P
2
P
N
-----
s
s
N
-----
P
cu1
P
cu1N
-------------
P
cu2
P
cu2N
-------------
P
Fe
P
FeN
----------