Abstract
The electrical and mechanical time constants of a moving-magnet-type linear DC motor (LDM) are required to have small values so as to realize a high-speed response LDM. Simplified expressions of the electrical and mechanical time constants of the LDM are derived using the permeance method. These constants are also computed using the finite element method (FEM) combined with the electric circuit equation. The measured electrical and mechanical time constants are 10.5 ms and 1.6 ms, respectively. The calculated values of the electrical time constant obtained by the permeance method and the FEM are 13.4 ms and 10.2 ms, respectively. The calculated values of the mechanical time constant obtained by the permeance method and the FEM are 1.6 ms and 1.5 ms, respectively. It is clarified that both methods are useful for calculating the electrical and mechanical time constants of the LDM.
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