Course detail

Electrical microdrives

FEKT-MEMIAcad. year: 2015/2016

Control of small electric drives employed in robotics, ICT peripherals, electrical appliances, automotive electrics, airspace, automation engineering, toys and medicine. Principles of operation, construction, parameters calculation/design of small electric motors, especially motors with semiconductor power converter.

Learning outcomes of the course unit

Graduate of the course is able to
- define nominal point of brushless DC motor regarding to torque-velocity characteristic,
- explain brushless DC motor control techniques, principles of DC/DC inverter, to analyze control loops and synthetize current and velocity regulators with help of standard optimal module techniques,
- describe utilization of the asynchronous machines in low voltage applications, redesign of the motor winding to new stator voltage and frequency value,
- explain principles of scalar and vector control techniques regarding to efficiency,
- explain principles of switched reluctance machines, define for which applications are these motor suitable, describe main limitations these machines,
- draw diagrams of power parts of various inverters of switched reluctance machines, explain various phase realization of the machines and behavior at full and reduced switching devices,
- distinguish various types of stepper motors, define possible applications of these motors and their technical limitations, explain principle of inverters for motor supplying, explain control techniques of step motors.
- distinguish basic types of disturbing feedbacks in power engineering, describe them and eliminate them, define recommendations for arrangement of power devices in terms of EMC,
- describe and design basic single and double-layer, distributed and concentrated windings of AC machines, compare their properties,
- explain and calculate the winding factors of these windings, describe and apply arrangements to reduce the spurious mmf harmonics,
- describe and explain the impact of the spurious mmf harmonics on operation of induction motor and permanent magnet synchronous motor,
- describe, modify and apply the basic design approach of magnetic circuit and winding to induction motor and to permanent magnet synchronous motor,
- modify the magnetic circuit and winding of the induction motor and permanent magnet synchronous motor to meet the required parameters,
- prepare 2D FEM model of the induction motor and permanent magnet synchronous motor, analyze results.

Prerequisites

Student should be able to - apply differential equations for description of the electromechanical system in time and Laplace domain, - describe motor principle according to their electrical diagram, - design cascade control structure , - handle the software tool Matlab/Simulink, - prove that he is qualified to handle with electrical equipment according to defined rules, - describe, modify and apply the basic design approach of magnetic circuit and winding to the permanent magnet DC motor and BLDC motor, - calculate the parameters of the permanent magnet DC motor, BLDC motor (steady-state operation), - draw and describe the waveform of magnetic flux density in the air-gap of permanent magnet DC motor, BLDC motor; sketch the slotting effect and the armature reaction effect, - draw and explain the waveform of the back-emf of DC motor, - describe the construction of BLDC motor and permanent magnet synchronous motor (PMSM), - draw and explain the waveform of the back-emf and idealized phase currents of BLDC motor and PMSM, - prepare 2D FEM model of the permanent magnet DC motor, BLDC motor under steady-state operation.

Co-requisites

Not applicable.

Recommended optional programme components

Not applicable.

Recommended or required reading

Koláčný, J. Elektrické mikropohony, skripta VUT v Brně, 2009 (CS)
Yeadon, W.H., Yeadon, A.W. Handbook of small electric motors. New York: McGraw-Hill, 2001. ISBN 0-70-072332-X (EN)
Boldea, I. Reluctance Synchronous Machines and Drives. Oxford University Press, USA, 1996. ISBN 978-0198593911 (EN)
Boldea, I. The Induction Machine Handbook. CRC Press, 1st edition, 2001. ISBN 978-0849300042 (EN)
Firemní literatura; Malé stejnosměrné motory MAXON, Uzimex Praha (CS)
Kenjo, T., Sugawara, A.: Stepping Motors and Their Microprocessor Controls. Clarendon Press, Oxford. (EN)
Krishnan, R.: Switched Reluctance Motor Drives. CRC Press. ISBN 0-8493-0838-0 (EN)

Planned learning activities and teaching methods

Teaching methods include lectures, computer laboratories and practical laboratories. Course is taking advantage of e-learning (Moodle) system. Students have to write a single project/assignment during the course and work out the laboratory protocols.

Assesment methods and criteria linked to learning outcomes

Computer and laboratory exercises - maximum 30 points
Final Exam - maximum 70 points.

Language of instruction

Czech

Work placements

Not applicable.

Course curriculum

Introduction, table of contents, references.
Losses and warming of electric machines, kinds of load el.machines and their dimensioning.
DC and BLDC permanent magnet motors; construction, principles of operation, characteristics.
BLDC drives; control, power supply, feedback sensors.
Stepper drives; types, terms, properties, power supply and control.
Switched reluctance motor drives; types, construction, principles of operation, characteristics, power supply and control.
Single and double-layer, distributed and concentrated windings of AC machines.
Parameters calculation/design of induction motors and permanent magnet synchronous motors.
AC drives with induction motors and permanent magnet synchronous motors, effects of mmf harmonics.
Utilization of the induction machines in low voltage applications, principles of scalar and vector control techniques regarding to efficiency.

Aims

To acquaint the students with the small electrical drives and machines, to apply and verify this knowledge using FEMM models and laboratory measurements.

Specification of controlled education, way of implementation and compensation for absences

The content and forms of instruction in the evaluated course are specified by a regulation issued by the lecturer responsible for the course and updated for every academic year.

Classification of course in study plans

  • Programme EEKR-M Master's

    branch M-SVE , 1. year of study, winter semester, 6 credits, optional specialized

  • Programme EEKR-M1 Master's

    branch M1-SVE , 1. year of study, winter semester, 6 credits, optional specialized

  • Programme EEKR-CZV lifelong learning

    branch ET-CZV , 1. year of study, winter semester, 6 credits, optional specialized

Type of course unit

 

Lecture

26 hours, optionally

Teacher / Lecturer

Computer exercise

21 hours, compulsory

Teacher / Lecturer

Laboratory exercise

18 hours, compulsory

Teacher / Lecturer