Considerations on the thrust-to-input ratio of a cylindrical moving-coil-type linear dc motor
✍ Scribed by Tsutomu Mizuno; Toshihito Miyashita; Hisashi Yajima; Yu Qi Tang; Hideo Yamamoto; Koyo Shibuya; Hajime Yamada
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 426 KB
- Volume
- 131
- Category
- Article
- ISSN
- 0424-7760
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✦ Synopsis
Linear dc motors (LDMs) are widely used for servoactuators, compressors, and so on. High-efficiency LDMs are strongly desired for compressors. To realize LDMs with high-efficiency characteristics, decreasing the copper losses, namely, thrust-to-input ratio, F / P, must be increased. This paper describes an optimization method for the F / P of a moving-coil-type LDM. The following results are obtained:
(1) Simplified expression for the F / P of the LDM is derived from the permeance analysis method. The effects of dimensions of the LDM on the F / P of the LDM are investigated through the simplified expression for the F / P. As a result, the optimum dimension of the LDM for maximizing the F / P exists.
(2) When the static thrust is 100 N, the measured F / P of the initial LDM is 7.9 N/W, and the errors using the simplified expression for the F / P and the finite element method (FEM) are 33 and 8%, respectively. Derived simplified expression for the F / P is useful because the F / P can be calculated easily.
(3) An improved LDM, which has 26% higher F / P than those of the initial LDM, is designed by using the permeance analysis method and the FEM.