MG5017 – Electrical Machines

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Module code
MG5017
Module title
Electrical Machines
Prescription
To enable students to gain an understanding of DC and single and three phase AC electrical machines, motor control and transformers.
Programmes
  • EN1801
  • SC1001
NZQA Level
Level 5
NZQA Credits
15
Delivery method
  • Web-Enhanced
Learning hours
Directed hours
75
Self directed hours
75
Total learning hours
150
Resources required
Learning Outcomes
Apply knowledge of transformer theory
Apply the theory of AC machines
Describe the application of AC Machines
Apply knowledge of DC motors
Describe the functioning of Synchronous machines
Content
Single loop conductor in a constant two-pole magnetic field as a motor; direction of rotation; factors influencing torque; shunt wound motor; series wound motor; cumulatively compounded motor; output calculations.
Single loop conductor in a constant two-pole magnetic field, direction of rotation; the shunt generator; output calculations.
Primary, secondary, turns ratio, kVA rating, equivalent circuit, operation on no-load and full-load, regulation, step up, step down, isolating, autotransformers.
Magnetising current, core losses, copper loss, hysteresis losses, the narrow hysteresis loop, explanation of eddy current generation, and the purpose of laminations.
Three-phase transformer configurations are explained
Electrical and mechanical power, torque, slip, efficiency, power factor; speed control using pole switching, slip ring motor, and variable frequency drives; testing, analysis and prediction of motor performance using transformer equivalent circuit model; induction machine as a generator (wind or hydro) running on the grid or stand alone
Induction motor starting and protection methods using traditional and solid state starters are described and compared.
AC motors for given applications are selected and described. Single-phase induction motors, split-phase, capacitor start, capacitor run, shaded pole and small synchronous; universal motor, stepper motor.
Small Generator; operation on, and synchronisation with an infinite bus; motor starting methods, operating at variable power factors, as a synchronous capacitor start.
Synchronous impedance, stability, and operational charts
Calculations using the equivalent circuit of the three-phase synchronous machine
Motors or generators are selected for given applications and the selection justified in accordance with industry practice.
Pumps, compressors, fans, high inertia loads, conveyors, winding machines, hydro generation, wind generation, thermal generation, gas turbine generation.

Assessment Criteria
Assessment 1 Laboratory 10
Assessment 2 Tests 40
Assessment 3 Exam 50