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Design of Electric Motor

Prof. Prathap Reddy · IISc Bangalore

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About

Electrical machines are the driving force for the modern world in one or another way. The main objective of this course is to understand the design of electrical machines with respect to different applications. This course starts with the principle of the electromagnetics and design of electromagnets. Once the students are familiar with the electromagnetic principle, the realization of the electrical machines and winding designs will be discussed. Afterwards, the generic design of rotating machines with respect to sizing equations, Winding volume product, electric loading, magnetic loading and geometrical construction and density will be discussed. Further, the design of induction machines switched reluctance machines and thermal design procedure for electrical machines will be discussed in detail.

Intended audience: Electrical Engineering students

Prerequisites: Basics of Electrical Machines and Electromagnetics

Lectures

Week 1 Review of Magnetic Circuits –I

  1. History Prospect of Electrical Machines YouTube
  2. Electric Fields YouTube
  3. Magnetic Fields-1 YouTube
  4. Magnetic Fields-2 YouTube
  5. Electric and Magnetic Circuits Interface YouTube
  6. Magnetic Materials and Concepts of BH Curves YouTube

Week 2 Review of Magnetic Circuits –II

  1. Analysis of Magnetic Circuits With and Without Air Gaps YouTube
  2. Example Problems of Magnetic Circuits YouTube
  3. Magnetic Circuits with Multiple Windings and Permanent Magnets YouTube
  4. Force Equations in Electromechanical Systems-1 YouTube
  5. Force Equations in Electromechanical Systems-2 YouTube
  6. Design of Electromagnetic Systems YouTube

Week 3 Rotating Magnetic Machines

  1. Realization of Electrical Machines-1 YouTube
  2. Realization of Electrical Machines-2 YouTube
  3. Magnetic Fields in DC Machines-1 YouTube
  4. Magnetic Fields in AC Machines-1 YouTube
  5. Magnetic Fields in AC Machines-2 YouTube

Week 4 Rotating Machine Windings

  1. Magnetic Fields in AC Machines-3 YouTube
  2. MMF Distribution of AC Machines YouTube
  3. Basics of Electrical Machine Windings YouTube
  4. Stator winding design-single layer winding YouTube
  5. Stator winding design-double layer winding YouTube

Week 5 Variable Pole Machines and Generalized Equations for Design of Electrical Machines-I

  1. Stator Winding Design-Fractional Slot Double Layer Winding YouTube
  2. Variable Pole Machine Stator Winding Design (Pole-Phase Modulation)- 1 YouTube
  3. Variable Pole Machine Stator Winding Design (Pole-Phase Modulation)- 2 YouTube
  4. Importance of Motor Design and Standards of Electric Motors YouTube
  5. Electric Machine Sizing Equations-Output Power and Volume (D2L) Product Equation YouTube

Week 6 Generalized Equations for Design of Electrical Machines-II

  1. Lab Session on Re-winding of Induction Motor (Example: Double Layer Winding) YouTube
  2. The Figure of Merits for Electric Motors and Aspect Ratio to Decouple the D2L Product YouTube
  3. Electric Machine Sizing Equations-Output Power Equation in terms of D3L Product - 1 YouTube
  4. Electric Machine Sizing Equations-Output Power Equation in terms of D3L Product - 2 YouTube
  5. Analysis of Copper Function and Output Function w.r.t the Electric Machine D3L Product Equation YouTube

Week 7 Induction Motor Design - I

  1. Example Problems on Output Power Equation in terms of D3L Product YouTube
  2. Electric Machine Sizing Equations-Output Power Equation in terms of D2.5L Product YouTube
  3. Design Procedure of an Electric Machine YouTube
  4. Name Plate Details and Datasheets of Induction Motor YouTube
  5. Design of Induction Machine- Stator Design -1 (Stator Core design) YouTube
  6. Design of Induction Machine- Stator Design -2 (Stator Winding Design) YouTube

Week 8 Induction Motor Design - II

  1. Design of Induction Machine- Stator Design -3 (Stator Slot Geometry) YouTube
  2. Design of Induction Machine- Rotor Design -1 (Rotor Slots Selection) YouTube
  3. Design of Induction Machine- Rotor Design -2 (Rotor MMF and Bar Currents) YouTube
  4. Design of Induction Machine- Rotor Design -3 (Rotor Slot Geometry) YouTube
  5. Design of Induction Machine- Rotor Design -4 (Skewing of Rotor) YouTube
  6. Design of Induction Machine- Rotor Design -4 (Resistance of Rotor Winding) YouTube

Week 9 Induction Motor Design - III

  1. Carter's Coefficient of Electrical Machines YouTube
  2. Effective Length Equations of the Machine Core with Different Stator and Rotor Lengths YouTube
  3. Stator MMF and Magnetizing Current Equations of Induction Machine YouTube
  4. Magnetizing Inductance of Induction Machine YouTube
  5. Stator and Rotor Leakage Inductances of Induction Machine YouTube
  6. Equivalent Circuit Parameters of Induction Machine YouTube

Week 10 Switched Reluctance Machine Design - I

  1. Loss Calculation of Induction Machine -1 (Copper Losses, Hysteresis and Eddy Current Loss Calculation) YouTube
  2. Loss Calculation of Induction Machine -2 and Performance Parameters of Induction Motor YouTube
  3. Switched Reluctance Machine Sizing Equations-Output Power and Volume (D2L) Product Equation YouTube
  4. The Figure of Merits for SRM and Example Problem on Output Power Equation in terms of D2L Product YouTube
  5. Design of Switched Reluctance Machine: Stator Design -1 YouTube
  6. Design of Switched Reluctance Machine: Stator Design -2 and Rotor Design YouTube

Week 11 Switched Reluctance Machine Design - I

  1. Procedure for Calculation of SRM Inductance: Aligned Inductance -1 YouTube
  2. Calculation of SRM Inductance: Aligned Inductance -2 YouTube
  3. Efficiency and Loss Calculation of SRM YouTube
  4. Importance of Thermal Design and Thermal Limits for Electrical Machines YouTube
  5. Electric and Thermal Circuits Interface YouTube
  6. Heat Transfer Methods and Basic Equations for Thermal Resistance YouTube
  7. Heat Flow in Electrical Machines YouTube

Week 12 Thermal Design of Electrical Machines - II

  1. Cooling Methods and Standards for Electrical Machines YouTube
  2. Basics of Thermal Equivalent Circuits YouTube
  3. Thermal Equivalent Circuit- 1 YouTube
  4. Thermal Equivalent Circuit- 2 YouTube

Syllabus and materials

At NPTEL, as the course publishes them.

Credits and licence

Institution
IISc Bangalore
Department
Electrical Engineering
Teacher
Prof. Prathap Reddy
Level
Undergraduate
Language
English
Subjects
Engineering
Source
NPTEL
Licence
CC BY-NC-SA, as NPTEL states it. Non-commercial use only. NPTEL's terms
Attribution
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