Mechatronic Engineering with Industrial Experience (5 Years) [MEng]View content for printing (opens a new page)
EEEN20020 - Machines, Drives & Power Electronics
Availability - Course (Compulsory/Elective)
|EEEN10024 Circuit Analysis|
|EEEN10027 Energy Transport and Conversion|
|EEEN10028 Electromagnetic Fields|
The programme unit aims to:
Introduce the methods by which electrical energy is converted from one voltage level to another using transformers or solid-state techniques, and converted to mechanical energy, using electrical machines and appropriate control techniques.
This unit will cover the following:
(1) Single-Phase Transformers. Principles of operation. Equivalent circuit. Load calculations. Open- and short-circuit. Tests. Regulation. Loss mechanisms. Uses of transformers. Construction (including high-frequency).
(2) Induction Machines. Production of a rotating field. Induced emf in the rotor, the concept of slip. Equivalent circuit. Performance calculations. Loss mechanisms. Efficiency. Torque/speed characteristics. Load curves and speed of operation. Speed control by classical means. The need for variable frequency.
(3) Synchronous Machines. Machine topologies and construction. Equivalent circuit. Performance. Phasor diagrams. Simple operating charts. Stability.
(4) DC-DC Converters. Principle of switched-mode power conversion. Power MOSFET and IGBT devices. Step-up and step-down chopper circuits. Inductive switching waveforms and switching losses.
(5) AC-DC Converters. Single-phase, half and full-wave rectifier circuits with inductive DC filter. Thyristor characteristics. Single-phase, phase-controlled operation - rectification and inversion modes - applications. Power transfer to non-linear loads, harmonics, power factor, input displacement factor and distortion factor.
Students will be able to:
Knowledge and understanding
- Understand the per-phase equivalent circuit representations of the transformer, induction and synchronous machines
- Understand how the rotational speed of electrical machines can be varied
- Explain the operation and characteristics of step-up and step-down DC-DC converters and phase-controlled AC-DC converters, including switching losses
- Explain the input current characteristics of single-phase rectifiers and the transfer of power to non-linear loads
- Perform load calculations for the transformer, induction and synchronous machines based upon the per-phase equivalent circuit approach
- Calculate the operating conditions and sketch the waveforms for set-up and step-down DC-DC converters and phase -controlled AC-DC converters
- Calculate semiconductor switching losses
- Analyse the input current of single-phase rectifiers and determine the power factor, input displacement factor and distortion factor
- Conduct measurements from which the induction motor and transformer equivalent circuit parameters may be determined
- Make connections to, and perform measurements on, both single and 3-phase systems
- Recognise harmonic distortion produced by power electronic circuits
Transferable skills and personal qualities:
- Communicate in both a verbal and written form
- Application of scientific principles and knowledge to solve engineering problems
- Work both independently and as part of team
- Interpret measured data
Teaching & Learning Process (Hours Allocated To)
Unseen Written Examination:
Two questions, answer all questions
Duration: 1 hour 30 minutes
Calculators are permitted
This examination forms 80% of the unit assessment
Two laboratory sessions
Laboratory duration: 3 hours
Assessment: Lab 1, satisfactory completion of laboratory (4%) and associated on-line Blackboard Quiz (6%)
Assessment: Lab 2, on-line report (10%)
The coursework forms 20% of the unit assessment
|Prof Sandy Smith||-||Lecturer|
|Prof Andrew Forsyth||-||Lecturer|