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Machines
The Switched Reluctance Motor (SRM) block represents three most common switched reluctance motors: three-phase 6/4 SRM, four-phase 8/6 SRM, five-phase 10/8 SRM, as shown in the following figure.
The electric part of the motor is represented by a nonlinear model based on the magnetization characteristic composed of several magnetizing curves and on the torque characteristic computed from the magnetization curves. The mechanic part is represented by a state-space model based on inertia moment and viscous friction coefficient.
To be versatile, two models are implemented for the SRM block: specific and generic models. In the specific SRM model, the magnetization characteristic of the motor is provided in a lookup table. The values are obtained by experimental measurement or calculated by finite-element analysis. In the generic model, the magnetization characteristic is calculated using nonlinear functions and readily available parameters.
Specifies a three-phase 6/4 motor, four-phase 8/6 motor, or a five-phase 10/8 motor.
Select Generic model or Specific model. The Parameters tab is modified accordingly.
The resistance Rs (Ω) of each stator phase winding.
The inertia momentum J (kg.m2).
The friction coefficient B (N.m.s).
The initial rotation speed w0 (rad/s) and initial rotor position Theta0 (rad).
The stator inductance when the rotor is in unaligned position Lq (H).
The unsaturated stator inductance when the rotor is in aligned position Ld (H).
The saturated stator inductance when the rotor is in aligned position Ldsat (H).
The stator maximum current Im (A).
The maximum flux linkage ψm (Wb or V.s) corresponding to Im.
The resistance Rs (Ω) of each stator phase winding.
The inertia momentum J (kg.m2).
The friction coefficient B (N.m.s).
The initial rotation speed w0 (rad/s) and initial rotor position Theta0 (rad).
The rotor position Θ (deg) for which the flux linkage is specified.
The stator current Is (A) for which the flux linkage is specified.
The 2-D lookup table containing the flux linkage as a function of stator current and rotor position.
If selected, the mask plots the magnetization curves corresponding to the lookup table provided. The magnetization curves represent the machine flux linkage versus the stator current with the rotor position as a parameter.
Specifies the sample time used by the block. To inherit the sample time specified in the Powergui block, set this parameter to -1.
The block input is the mechanical load torque (in N.m). TL is positive in motor operation and negative in generator operation.
The block output m is a vector containing several signals. You can demultiplex these signals by using the Bus Selector block from Simulink library.
Signal | Definition | Units |
|---|---|---|
V | Stator voltages | V |
flux | Flux linkage | V.s |
I | Stator currents | A |
Te | Electromagnetic torque | N.m |
w | Rotor speed | rad/s |
teta | Rotor position | rad |
The power_SwitchedReluctanceMotor demo illustrates the simulation of the Switched Reluctance Motor.
To develop positive torque, the currents in the phases of a SRM must be synchronized to the rotor position. The following figure shows the ideal waveforms (Phase A inductance and current) in a 6/4 SRM. Turn-on and turn-off angles refer to the rotor position where the converter's power switch is turned on and turned off, respectively.
[1] T.J.E. Miller, Switched Reluctance Motors and Their Control, Clarendon Press, Oxford, 1993.
[2] R. Krishnan, Switched Reluctance Motor Drives, CRC Press, 2001.
[3] D.A. Torrey, X.M. Niu, E.J. Unkauf, "Analytical modelling of variable-reluctance machine magnetisation characteristics," IEE Proceedings - Electric Power Applications, Vol. 142, No. 1, January 1995, pp. 14-22.
[4] H. Le-Huy, P. Brunelle, "Design and Implementation of a Switched Reluctance Motor Generic Model for Simulink SimPowerSystems," Electrimacs2005 Conference.
 | Surge Arrester | Synchronized 6-Pulse Generator |  |
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