Abstract
Due to high efficiency, excellent speed-adjustability, and high feasibility, the
high-power Permanent Magnet Brushless DC Motor（PMBDCM）drive system has applied
in the domains as ships, aircrafts and so on, where the attention is firstly paid to the running
efficiency and feasibility of drive system. The equipments for high-power PMBDCM drive
have been developed in foreign countries. However, the technique concerned is kept to
themselves. In domestic, the research work is mainly focused on the fractional power
PMBDCM at present, and the work for high-power PMBDCM drive is just kicked on, so
many problems exist in the design of high-power PMBDCM proper and the development of
PMBDCM drive system.
In order to investigate the performance of one kind of high-power PMBDCM drive
system, a 50kW multi-phase permanent magnet brushless DC sample motor is developed in
this dissertation. The sample motor is strictly referred to one high-power PMBDCM, and
the structure of drive system is also accorded to the high-power PMBDCM drive system.
By dint of the sample motor drive system, this dissertation has expounded the operation
principle, discussed the parameter choice and analyzed experimental data, and then some
valuable conclusions were drawn for the high-power PMBDCM drive system. The
dissertation is deployed as follows:
Firstly, the operation principle of the high-power PMBDCM drive is introduced. The
PMBDCM drive system presented in this dissertation adopts thyristors as the operation
power electronics, and employs capacitor for commutation, so the drive system has a
special operation manner and control scheme. By sorting out the running status, the trigger
control rules is formulated and the trigger control scheme is optimized, which lay a
foundation for the simulation of the PMBDCM drive, and so do with the development of
practical drive system.
Then, the commutation process of the PMBDCM drive is investigated, and the effect
of relational parameters upon the commutation characteristics is sum up, thereafter the
criterion of the parameter choice for drive system is brought out. The criterion has been
verified by the sample drive system. The commutation investigation provides a theoretic
support for the design of high-power PMBDCM drive.
III
