Electric Vehicle Motors – IV | Switched Reluctance Motor (SRM) | Torque Production | Four-Quadrant Operation | Asymmetric Bridge Converter | Lecture 26

The Switched Reluctance Motor (SRM) is an attractive traction motor for electric vehicles due to its simple and robust construction. In this lecture, we continue the study of SRM by exploring its operating principle, electrical angle, pole pitch, phase excitation, and torque production. The relationship between rotor position and electrical angle is explained using a 6/8 SRM, along with the concept that one rotor pole pitch corresponds to 360° electrical. This lecture further develops the equivalent circuit model and power conversion process of the SRM. You will learn how the position-dependent phase inductance L(θ) leads to the fundamental SRM torque equation, and how torque is produced through the variation of inductance with rotor position. The motoring and generating modes, four-quadrant operation, and phase current control are also discussed. Finally, the asymmetric bridge converter is introduced for independent excitation and current control of each SRM phase, including its different switching modes and the corresponding phase voltages.

Topics Covered

Switched Reluctance Motor (SRM) Operation
Rotor and Stator Pole Positions
Mechanical and Electrical Angles
Rotor and Stator Pole Pitch
Electrical Angle Calculation in SRM
Number of Torque Pulsations / Strokes
SRM Phase Excitation and Commutation
Equivalent Circuit Model of SRM
Position-Dependent Inductance L(θ)
Torque Production in SRM
Motoring and Generating Operation
Four-Quadrant Operation
Asymmetric Bridge Converter
SRM Converter Operating Modes
Hard and Soft Switching

Who Should Watch?

B.Tech. and M.Tech. students
Power Electronics learners
Electric Vehicle enthusiasts
GATE and ESE aspirants
Researchers working on electric drives and SRM technology
Engineers designing EV traction motors and motor drives

Recommended References

R. Krishnan, Switched Reluctance Motor Drives: Modeling, Simulation, Analysis, Design, and Applications, CRC Press.

R. T. J. Miller, Switched Reluctance Motors and Their Control, Oxford University Press.

B. Bilgin, J. W. Jiang, and A. Emadi, Switched Reluctance Motor Drives: Fundamentals to Applications, CRC Press.

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