2 Engineering
2.11 Three-phase motors
56
DC1…20… and DC1…OE1 Variable Frequency Drives
02/20 MN040059EN
www.eaton.com
2.11.2 Circuit types with three-phase motors
A three-phase motor’s stator winding can be connected in a star connection
or delta circuit as per the mains voltage (U
LN
= output voltage U
2
) and the
rated operational data on the motor’s nameplate (rating plate).
Figure 20:
Example of a nameplate (rating plate)
for a three-phase asynchronous motor
Figure 21:
Configuration types:
Star-connected circuit (left), Delta circuit (right)
Examples based on figures 20 and 21
Motor in star connection,
mains voltage: three-phase 400 V; output voltage: three-phase 400 V
￫
DC1-342D2…
Motor in delta circuit,
mains voltage: single-phase 230 V; output voltage: three-phase 230 V
￫
DC1-124D3…
Motor connection
DC1 variable
frequency drive
according to
IEC
according to
UL
U
U1 (-U2)
T1 (-T4)
V
V1 (-V2)
T2 (-T5)
W
W1 (-W2)
T3 (-T6)
1410 mi n
230/400 V
3.2/1.9 A
50 Hz
-1
0,75 KW
cos ϕ 0.79
U1
V1
W1
W2
U2
V2
U1
V1
W1
W2
U2
V2
