Conventional DC-brush motors have been used extensively as variable speed drive systems due to their linear characteristics, which result in easy speed control. However, AC drives become an attractive alternative to their DC counterparts in various industrial applications. This is due to the recent developments in both power electronics and microelectronics technology. Brushless permanent magnet motors combine the advantages of brush-DC motors and AC motors. Therefore, a tremendous effort is carried out to utilise this type of electrical drive in high performance industrial applications. A robust control design, having the feature of insensitivity to parameter variations and load torque disturbances, is highly demanded in many modern variable drive systems. The recent advancements in producing fast microprocessors and high switching power devices enable the digital implementation of advanced control schemes. One of these schemes is the sliding mode control technique, which has been implemented successfully in a wide variety of industrial applications. A real-time high performance low cost speed control of brushless DC motor drive is developed in this thesis. The controller design is based on the theory of sliding mode control. The developed drive system is further improved by including a 'chattering reduction' in the controller design. The developed speed control system is assessed through both simulation and practical studies. The practical implementation is achieved using the Intel 80C196KC single chip microcontroller and all the required tasks are carried out solely through software, which has the flexibility for future development. Extensive results at different operating conditions are given throughout the thesis to prove the validity of the developed scheme.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:635778 |
| Date | January 1998 |
| Creators | Anagren, Y. N. F. |
| Publisher | Swansea University |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
Page generated in 0.0022 seconds