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Elechtromechanical Devices for Industrial Automation
31472
Description
Course Program

1) Materials used in the construction of electromechanical devices
  1. Insulating materials
  • Electrical characteristics
  • Mechanical characteristics
  • Thermal characteristics
  • Insulation classes of insulating materials
  • Use of resins in electrical machines

2. Magnetic materials
  • Magnetic, mechanical, and electrical requirements
  • Magnetic alloys
  • Laminated sheets, loss figure
  • Types and classification of magnetic laminations
  • Characteristic magnetic curves of magnetic materials

3. Conductors: 
  • Electrical and mechanical requirements
  • alloys

Permanent magnets
  • Magnets based on ferromagnetic alloys and sintered powders
  • Market diffusion and costs of magnets
  • Technological issues
  • Magnetic, mechanical, and thermal requirements
  • Alloys
  • Temperature stability
  • Magnetic circuits
  • Calculation of the operating point of a permanent magnet in an iron magnetic circuit with air gap
  • Application examples

2) Electromechanical energy conversion and motion dynamics

  1. Elementary diagram of an electromechanical converter
  • Linear motion
  • Circular motion

  1. Magnetic energy
  2. Electrical equilibrium equations
  3. Faraday's law
  4. Ampere's law
  5. Energy balances
  6. Virtual work principle for an electromechanical system, Example of electromagnetic force calculation on a relay armature
  7. Reluctance torque
  8. D’Alembert’s principle for mechanical systems in linear and circular motion (dynamic motion equations)
  9. Motor-load coupling with rigid shaft, Simulink model
  10. Moments of inertia, Transfer of moments of inertia between rotary and linear mechanical couplings
  11. Mechanical power and rough sizing of an electric machine
  12. Electromechanical characteristics
  • Steady-state operating points
  • Operating quadrants in the speed-torque Cartesian plane
13. Typical characteristics of some loads

3) Rotating fields

  1. Vectors, phasors, symmetrical component
  2. Pulsating field
  3. Rotating field
  4. Galileo Ferraris’ theorem

4) Synchronous machine

  1. General principles, stator, rotor, smooth rotor, and salient pole rotor
  2. Induced e.m.f.
  3. No-load characteristic
  4. Stator field and armature reaction
  5. Torque
  6. Equivalent circuit
  7. Vector diagram
  8. Operation on grid with prevailing generator or motor power
  9. Generator operation on isolated grid
  10. External characteristics (*)
  11. Active and reactive power regulation
  12. Application fields

5) Notes on harmonic analysis
  1. Even and odd functions
  2. Harmonic decomposition of some typical periodic functions

6) Brushless AC motor
  1. Vector diagram
  2. Control ranges depending on speed and maximum available and/or applicable voltage
  3. Supply via converter
  4. Control of direct-axis and quadrature-axis currents (*)
  5. Coordinate transformations (*)
  6. Application fields

7) Static conversion
1. Rectifiers
  • Diode as nonlinear component
  • Single-phase rectifiers
  • Three-phase rectifiers

2. Voltage chopping cells, SPICE example
3, Differential connection of multiple chopping cells
4. Output characteristic
5. Three-phase inverter
6. Modulation principles on a single-phase inverter

  • SPICE example
  • Amplitude and frequency modulation indices

7. Voltages generated by a three-phase inverter
8. General notes on three-phase modulation techniques

8) Sensors and transducers

  1. Speed and position transducers
    1. Resolver, Operating principle and applications
    2. Encoder, Operating principle and applications, Absolute and incremental encoders
  2. Current sensors
    1. Shunt
    2. Open-loop and closed-loop Hall-effect sensors
    3. Dynamic model and Simulink example

  3. Torque measurements
    1. Indirect
    2. Direct

  4. Force measurements using strain gauge

9) Asynchronous motor
  1. Operating principle, stator, rotor
  2. Construction examples (*)
  3. Terminal box
  4. Wound rotor and squirrel cage rotor
  5. Induced e.m.f. and equivalent circuit
  6. Definition of slip
  7. Simplification of the equivalent circuit
  8. Circular diagram

    1. Example in GeoGebra
    2. Torques, iron losses, copper losses, efficiency

  9. No-load and short-circuit tests, determination of simplified equivalent circuit parameters
  10. Electromechanical characteristic, Influence of rotor resistance
  11. Operation as motor, generator, and brake
  12. Supply via converter, Voltage and frequency control
  13. Application fields

10) DC machine
  1. Operating principle
    1. Induced e.m.f.
    2. Commutator
    3. Commutation

  2. Electrical equilibrium equation, torque constant
  3. Power balance
  4. Electromechanical characteristic
  5. Efficiency
  6. Application fields

11) General structure of a drive system

  1. Static converters, electric machines, sensors and transducers, etc.
  2. PID controllers
    1. Definition
    2. Operating principle
    3. Example in Simulink
    4. Notes on Ziegler method for PID tuning (*)

12) Heating of machines
  1. Temperature transient
  2. Service types specified by standards
  3. General method for service reduction
Crédits ECTS
9
Langue d'enseignement
italiano
Langue d'examen
italiano
Langue des supports pédagogiques
italiano
Acquis d'apprentissage fondamentaux
Entité de gestion (faculté)
Department of Civil and Mechanical Engineering (UNICAS)