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
I1
I2
N
X
I1
I2
S
Mksg
MN
90˚
M
i
k
Φ
i
β
sin
⋅ ⋅ ⋅
=