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International Journal of Communications and Engineering

Volume 01No.1, Issue: 01 March2012

Page 134

SIMULATION OF 8/6 AND 8/14 SWITCHED

RELUCTANCE MOTOR BASED ON

MATLAB/SIMULINK ENVIRONMENT

R.JothilakshmiII MEAE,Department of EEE

Hindusthan College of Engineering and Technology

[email protected]

G.MuthuramAssistant Professor-EEE,

Hindusthan College of Engineering and Technology

AbstractSwitched Reluctance Motor (SRM) has become a competitive selection for many applications of electric

machine drive systems recently due to its relative simple construction and its robustness. The major

drawbacks of the SRM are the torque ripple. The purpose of the thesis is to design and implement a softswitching converter topology using Insulated Gate Bipolar Transistor (IGBT) suitable for Switched

Reluctance Motor (SRM). The topology is verified through MATLAB simulation. Simulation results fornew SRM 8/14 and conventional SRM 8/6 with same number of phases and outer dimensions are

presented and compared. This new configuration shows that it will stabilize torque and ripples are

reduced.Therefore, new design approach should be considered to make this type of machines a more

attractive for high performance HEVs (Hybrid Electric Vehicles) drives.

1.INTRODUCTIONThe applications of Switched

Reluctance Motor (SRM) under special

environments have being increased day by day,

because they have several inherent advantageous

features such as rug, low cost, robustness and

possible operation in high temperatures. To

analyze the operating performance of SRM, lots

of modeling methods were presented. The circuit

simulation program SPICE, it has certainlimitations. It is very flexible, but it is difficult to

actualize, because it needs the complete

mathematical model of the system. To introduce

some modules and M-file in MATLAB to build

the nonlinear mathematical model of the

magnetization curves, it is accurate, but the

simulation speed is slow. A novel method fornonlinear modeling based on circuit simulation

is built by self defining M-functions and basic

modules matlab/simulink library. The model

built in this paper is very flexible and visual; its

simulation speed is very fast.

This paper presents a novel modeling

for Nonlinear Modeling and closed loop controlof Excitation parameters for high speed switched

reluctance Motor (SRM). In this simulationmodel, the bridge inverter and design of each

phase model are simulated. The turn-on and

turn-off angles are the two parameters through

which we can control the simulation results. The

torque will stabilize and ripples are reduced. Themodel requires a minimum of pre-calculated or

measured input data. A matlab/Simulink

environment to simulate 8/6 SRM and 8/14

SRM is presented and compared.

2. DEVELOPMENT OF TORQUE

The most general expression for the torqueproduced by one phase at any rotor position is,

T = [ W`/ ] i = Const.(1.1)

Since

W`=Co-energy = F = N I..(1.2)

This equation shows that input electrical power

goes partly to increase the stored magnetic

energy (L*i2) and partly to provide

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mechanical output power ( i2/2 x dL/d x ),the latter being associated with the rotational

e.m.f. in the stator circuit.

Neglecting saturation non-linearity

L = Inductance = N/ I..(1.3)

T = i2 dL/d...(1.4)This equation shows that the developed torque is

independent of direction of current but only

depends on magnitude of current & direction of

dL/d.

3. GENERALIZED EQUATION OFMOTOR:

The voltage equation is,

V= r i +d / dt ..(1.5)

=Li=N.........................................(1.6)

For r = 0

V = L di/dt + i (dL /d) (d/dt)

V = L di/dt + i (dL/d)(1.7)

4.MODELLING AND SIMULATION

RESULTS OF 8/6 SRM USING MATLAB

Fig 1 SRM Simulation Model for 8/6

Fig 2 Four-phase converter block (Expansion

of fig 1)

Fig 3 Single phase converter block

(Expansion of fig 2)

From Above equations of SRM the model for

simulation is developed

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Fig 4 Current response of 8/6 SRM

Fig 5 Speed response of SRM 8/6 SRM

Fig 6 Torque response of 8/6 SRM

5. MODELLING AND SIMULATION

RESULTS OF 8/14 SRM USING MATLAB

Fig 7 SRM Simulation model for 8/14

Fig 8 SRM Model for 8/14

(Expansion of fig 4)

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Fig 9 Expansion of fig 2

Fig 10 Current response of 8/14 SRM

Fig 11 Speed response of 8/14 SRM

Fig 12 Torque response of 8/14 SRM

6.CONCLUSION

This paper has described and discussed in detailhow from Matlab-Simulink one can achieve the

simulation environment for a switched

reluctance motor. Here Four-phase conventional

SRM 8/6 and novel configuration SRM 8/14 are

presented. Inherent advantages of the SRM 8/14over 8/6 are additional winding space and higher

number of rotor poles. Also SRM 8/14 has low

production cost than that of SRM 8/6.

Several simulations have been achieved in order

to study the dynamic behavior of the SRM. We

mainly verified the influence of the turn-offangle in its dynamic behavior. It was proved

dependent of the machine's operating point and

that exists a turn off value, which allow torque

ripple reduction. The new configuration enjoys

all other advantages of the SRMs, such as simple

construction, mechanical robustness and

reliability.SRM 8/14 can improve usability of

the SRMs for high performance HEVs

propulsion systems.

7.REFERENCES

1.Bilgin.B,Comparative Evaluation of 6/8 and6/10 Switched Reluctance Machines for Traction

Application in Plug-in Hybrid Electric

Vehicles,IEEE Transactions on IndustryApplications,Vol.38,no.4,pp.106-1071,February/March 2011.

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Page 138

2.Bilgin.B,Emadi.A Design Considerations forSwitched Reluctance Machines with Higher

Number of Rotor Poles switched reluctance

Motor, IEEE Transaction onmagnetics,vol.38,no.2,pp,929- 932,April 2011.

3.Chancharoensook.P .A DSP Based SpeedControl of a 4-Phase 8/6 Switched Reluctance

Motor Drive,Australasian Universities PowerEngineering Conference, pp.26-29 ,September

2004.

4. Chancharoensook,P,Rahman,DynamicModeling of a Four-Phase 8/6 Switched

Reluctance Motor Using Current and Torque

Look-Up Tables,IEEE Transactions onIndustrial Electronics Society 5- 8 Nov. 2002,

7803-7474-6, vol. 1, pp.491-496.

5. Chen.C.G,Liu.T.H, Nonlinear Controller for

Switched Reluctance Drive Systems, IEEETransactions on Aerospace and ElectronicSystems, vol. 39, no. 4, Oct. 2003, pp. 1429-

1440.

6. Desai.P.C,Emadi.A, Novel SwitchedReluctance Machine Configuration with higher

number of Rotor Poles than Stator Poles, IEEETransactions on Industrial

electronics,vol.57,no.2,pp.649-659,February2010.

7. Lee.J.W, New Rotor Shape Design for

Minimum Torque Ripple of SRM using FEM ,IEEE Transaction on

magnetics,vol.40,no.2,pp,754-757,2004.

8. So-Yeon Ahn, Jin-Woo Ahn, Dong-Hee Lee,

A Novel Torque Design for High speedSwitched Reluctance Motor using negative

torque compensator, IEEE Transcations on

power electronics, vol. 33,no.2,pp.477-484,May/June 2011

9.Zhang.Z,Cheng,K.W.E, Analysis and Designof a Cost Effective Converter for Switched

Reluctance Motor Drives Using Component

Sharing,IEEE Transactions on Industry

Applications,vol. 38,no.6,pp.1500-

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