Abstract
The electrical and mechanical time constants of the linear dc motor (LDM) are required to be small so as to achieve a high-speed response. This paper describes a design method of the magnetic circuit and the electrical and mechanical time constants on a moving-magnet-type LDM. The following results are obtained:
(1) Design a high-speed-response moving magnet type LDM using the expressions of the electrical and mechanical time constants.
(2) In the LDM designed using this approach mechanical time constant is 1.9 ms and erectrical time constant is 5.4 ms. Moreover the calculation by FEM mechanical time constant is 2.0 ms and erectrical time constant is 4.6 ms, and the differences with a pemeance method are 5 % and 17 % grade, respectively. Therefore, this design approach using the pemeance method is useful as means to calculate characteristics of LDM as compared with the calculation approaches, such as FEM, though it is simple.
