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SYLLABUS
UNIT-I
Permanent magnet materials and PMDC motors Introduction – Classification of permanent magnet materials used in electrical machines – Minor hysteresis loop and recoil line – Stator frames of conventional DC machines – Development of electronically commutated DC motor from conventional DC motor – Permanent-magnet materials and characteristics-B-H loop and demagnetization characteristics-Temperature effects: reversible and irreversible losses-high temperature effects – Reversible losses – Irreversible losses recoverable by magnetization – Mechanical properties, handling and magnetization – Application of permanent magnets in motors – Power density – Operating temperature range – Severity of operation duty.
UNIT-II
Stepper motors Classification of stepper motors – Hybrid and Variable Reluctance Motor (VRM) – Construction and principle of hybid type synchronous stepper motor – Different configuration for switching the phase windings control circuits for stepper motors – Open loop and closed loop control of 2-phase hybrid stepping motor. Construction and principle of operation of Variable Reluctance Motor (VRM) – Single stack and multiple stack – Open loop control of 3-phase VR Stepper Motor – Applications.
UNIT-III
Switched Reluctance Motors Construction – Comparison of conventional and switched reluctance motors – Design of stator and rotor pole arcs – Torque producing principle and torque expression – Different converter configurations for SRM – Drive and power circuits for SRM – Position sensing of rotor – Applications of SRM
UNIT-IV
Square wave permanent magnet brushless dc motor Types of constructions – Surface mounted and interior type permanent magnet – Principle of operation of BLDC motor. Torque and EMF equations – Torque speed characteristics – Performance and Efficiency – Square wave brushless motors with 120º and 180º magnetic areas commutation.
UNIT-V
Sine wave permanent magnet brushless motor Torque and EMF equations – Phasor Diagram – Circle Diagram – Torque/speed characteristics – Comparison between square wave and sine wave permanent magnet motors – Applications.
UNIT-VI
Liner induction motors (LIM) Construction – Principle of operation – Double sided LIM from rotating type Induction Motor – Schematic of LIM drive for traction – Development of one sided LIM with back iron-equivalent circuit of LIM.
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CategoriesEngineering
Format EPUB
TypeeBook