PLECS 3.3 Online Help |
Detailed model of switched reluctance machine with open windings
Electrical / Machines
These components represent analytical models of three common switched reluctance machine types: three-phase 6/4 SRM, four-phase 8/6 SRM and five-phase 10/8 SRM.
The machine operates as a motor or generator; if the mechanical torque has the same sign as the rotational speed the machine is operating in motor mode, otherwise in generator mode. In the component icon, the positive terminals of the stator windings are marked with a dot.
The machine flux linkage is modeled as a nonlinear function of the stator current
and rotor angle accounting for both the magnetization characteristic of the
iron and the variable air gap.
In the aligned rotor position the flux linkage is a nonlinear function of the stator current:
where
For intermediate rotor positions the flux linkage is written as a weighted sum of these two extremes
using the weighting function
where is the number of rotor poles,
is the number of stator poles, and
is the index of the stator phase.
The electromagnetic torque produced by one phase is the derivative of the coenergy with respect to the rotor angle:
The total torque of the machine is given by the sum of the individual phase
torques.
Rotor speed:
Rotor angle:
The output vector “m” contains the following 7 signals: