A linear haptic motor with cogging force optimization

Abstract

This paper proposes a new linear haptic motor design that considers a new magnetic circuit, cogging-force optimization, and spring shape. The force distribution on the haptic motor is calculated using the Maxwell stress tensor. To reduce the spring stiffness of the mechanical system, the cogging force is treated as a linear negative stiffness. Several new designs have been proposed to meet the design targets. The design of center and side core widths is used in the optimization process to obtain the maximum cogging force and current force. The final design of the linear haptic motor provides good acceleration performance on a dummy jig that is greater than 1.0 G. The experimental and analysis results are in good agreement. • Described the force distribution and X-direction cogging force effect on mechanical system. • Applied E-M coupled method on linear haptic motor to obtain the displacement and acceleration of dummy jig. • Proposed magnetic circuit optimization approach to obtain the maximum X-direction cogging force and current force. • Improve the motor performance and used new spring shape to solve the Z-direction cogging force.