ELECTRIC MOTOR

PROJECT DETAILS ENB 205 – Electrical and Computer Engineering Group Project [4 Members] 2014 Semester 2 [3rd Year] GRADE 96.67% – High Distinction [7] OVERVIEW Designed, built and tested a permanent magnet DC motor. This involved many calculations, and writing a report and a MATLAB Script.

The objective of this project was to design, build and test a brushed permanent magnet DC motor to perform a chosen task. To achieve a 7, the motor had to produce the designed power at 2,000 RPM, drawing less than 30 V and 5 A, and start without mechanical/human assistance.

The materials supplied to us were: a basic motor frame; aluminium shaft, ball bearing and nylon bush assembly; up to 16 rotor plates; up to 45 metres of copper wire; two magnets; and two brass brushes. To improve the performance of the motor, we made various additions and changes. These included: the addition of an outer yoke (or stator); additional support to the motor frame; and a custom-made commutator.

The outer yoke consisted of 5mm thick 90 NB (101.6 mm outer diameter) black steel pipe, which decreased flux leakage and increased the mass of the motor so as to reduce the amplitude of any vibration. The custom commutator was constructed from a combination of laser-cut 3 mm MDF and a 25 mm copper pipe joiner.

The motor performed as required at load, however required assistance to start, which is where we lost the 3.33%. Due to our structural alterations being 'too good' we were able to position the magnets within 3 mm of the rotor. This caused cogging issues which the motor did not have enough torque to overcome.

10Thomas Knight | Résumé

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01 OVERVIEW 02 SKILLS & INTERESTS 03 WORK EXPERIENCE 04 EDUCATION 05 PROGRAMS & LANGUAGES 06 REFEREES 07 PROJECTS

ELECTRIC MOTOR 11Thomas Knight | Résumé

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