Transformer Characteristics of Linear Motor-Transformer Apparatus
- 1
- 2
- 3
Abstract
The characteristics of linear transformer are studied analytically. The transformer is composed in one of modes of linear motor-transformer apparatus proposed for future wireless light rail vehicle (LRV). The secondary (onboard) power factor can be adjusted at any value by an onboard converter. The equivalent circuit is used to study the transferred power control. The parameters are determined by three-dimensional finite element method (FEM) analysis for one pole-pair model. Under the rated primary (input) and secondary voltage and current, which are specified for linear motor operation, the characteristics of the secondary power factor are cleared. It is also shown that the input capacitor can improve the primary power factor and decrease the input power capacity, but does not change the efficiency. This linear transformer has the efficiency of 91% and the input power factor of 0.87 when the apparatus without input capacitor is controlled at the secondary power factor of 0.4.
- B. Yang, M. Henke and H. Grotstollen, “Pitch Analysis and Control Design for the Linear Motor of a Railway Carriage,” IEEE IAS Annual Meeting (IAS2001), Chicago, October 2001, pp. 2360-2365.
- N. Fujii and T. Mizuma, “Device with Functions of Linear Motor and Non-Contact Power Collector for Wireless Drive,” Transmission IEE of Japan, Vol. 126-D, No. 8, August 2006, pp. 1113-1118 (in Japanese).
- N. Fujii and T. Mizuma, “Analytical Study of Special Linear Motor-Transformer for Wireless Tram,” Conference Record of The 2008 IEEE Industry Applications Conference, IAS62p1, October 2008, p. 7.
- N. Fujii, H. Ashitomi and T. Mizuma, “Equivalent Circuit of Linear Transformer with Function of Linear Motor,” ISEF 2009—XIV International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, Arras, France, September 2009.