induction machines diagnostics and engineering solutions for induction motor problems, including: operating principles of polyphase induction motors encompassing: rotating magnetic field torque slip MMF relationships leakage fluxes construction of polyphase induction motors encompassing: squirrel cage motors slip-ring motors construction considerations in minimisation of tooth locking speed-torque relationships in induction motors encompassing: maximum torque torque – slip relationships squirrel cage rotor types power flow in the motors power distribution torque units slip ring rotors induction motor performance testing encompassing: no-load tests locked rotor tests development of motor equivalent circuit from test results analysis of motor performance using circle diagrams induction motor starters encompassing: starting requirements type of starters starting torque starting dynamics static friction mechanical loads starting duration reduced voltage starting encompassing: starting dynamics change over conditions starting duration acceleration curves speed control of induction motors encompassing: constant torque, constant power concepts torque-flux-voltage relationships rotor resistance control stator impedance control variable frequency control (e.g. PAM, PWM and flux vector control) braking of induction motors encompassing: electrical braking systems (plugging, direct current (d.c.) dynamic, regenerative and capacitor-magnetic) mechanical braking systems (mechanical drum, demag and eddy current) motor protection encompassing: overload earth fault phase failure motor selection criteria and RMS rating induction motor maintenance/repair encompassing: routine maintenance schedules type of repairs (mechanical and electrical) single phase induction motors encompassing: operating principles (especially RMF) construction types speed-torque relationships testing relevant induction machine construction, operation, characteristics and applications, including driven load and duty cycle relevant machine parameters, specifications and performance requirements relevant manufacturer specifications and operating instructions/manuals relevant job safety assessments or risk mitigation processes relevant WHS/OHS legislated requirements relevant workplace documentation relevant workplace quality, instructions, policies and procedures. |