Lust CDA3000 - Page 75

2-42
Engineering Guide CDA3000
2 Drive definition
Torque as a function of load angle
Internal torque (M
i
)
Idling of the reluctance/
synchronous motor
Loading of the reluctance/
synchronous motor
The stator field
Φ
1 with the field system of
the rotor
Φ
2 represents a fixed magnetic
adhesion.
As the load on the shaft increases, the rotor
displacement angle/load angle increases
steadily. The speed remains synchronous.
X Direction of rotation
β
Load angle
Table 2.10 Torque as a function of rotor displacement angle β
(load angle)
β
referred to the motor shaft
Pole pairs
β
MN
typical β
Mksg
1 20° 45°
2 10° 22.5°
3 6.75° 15°
4 5° 11,25°
Table 2.11 Internal torque as a function of load angle
N
S
X
I
1
I
2
N
X
I
1
I
2
S
M
ksg
M
N
90˚
M
i
k Φ i βsin⋅⋅⋅=