Algorithm of brush short-circuit coefficients of DC machines for extremely low speed drives
Tóm tắt
When a direct-current (DC) machine runs at extremely low speed or standstill, the reduction in the armature resistance and the armature flux linkage due to the short circuited coils by the brushes on the commutator should not be neglected. Taking this reduction effect into account, the average values of the reduction coefficients relate to the machine parameters in complicated forms. In this paper, an effective algorithm for the precise computation of the average values of these reduction coefficients is proposed. Furthermore, in the algorithm, the effect of the insulation thickness between the commutator segments and the multiplicity of the wave winding are considered for the first time. The proposed algorithm can also be accommodated into the computer-aided design (CAD) of a DC machine, which normally runs at extremely low speed or standstill.
Tài liệu tham khảo
Hu Hui. The study on extremely low-speed DC drive system with large inertia [J]. Small and Middle Electric Machines, 2003, 29(1): 35–38 (in Chinese).
Xue Shuang-shuo, Wang Da-xing. The realization of a kind of DC moment machine speed drive system with wide speed range and highly precision [J]. Electrical Transmission Automation, 2002, 24(6): 11–14 (in Chinese).
Chen Tao, Chen Juan, Chen Chang-qing. Adaptive tracking control of DC torque motor in low speed [J]. Opto-Electronic Engineering, 2003, 30(3): 31–34 (in Chinese).
Du C Y, Li T C, Cao Z C. Accurate tracking control of a limited angle torque motor [C]// Conference Record of the Industry Applications Conference, 38th IAS Annual Meeting, Salk Lake City, Utah, USA. New York, USA: IEEE Computer Society Press, 2003, 2: 744–748.
Jiang Shu-min, Yang Yang, Wang Guo-qing. Design and implementation of fight simulators with high precision and super-low speed and large load [J]. Mechanical Science and Technology, 2006, 25(11): 1328–1330 (in Chinese).
Wang Da-xing, Du Fu-jia. Ultra-low speed research on friction drive for astronomical telescope [J]. Optics and Precision Engineering, 2006, 14(2): 274–278 (in Chinese).
He Song-bo, Shi Jing-hao. Design Procedures for Micro and Special Electric Machines [M]. Shanghai: Shanghai Scientific and Technical Publishers, 1983, 461–464 (in Chinese).
Zhang Q, Xie G D, Huang S R. Computation of brush short-circuit coefficients of dc machines for extremely low speed drives [J]. Journal of Shanghai University (English Edition), 2006, 10(5): 436–442.