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This paper describes a linear motor design for ultrahigh acceleration and high velocity, as well as the driving performance of the motor. First, because of its ease of control, a moving-permanent-magnet linear synchronous motor (MPM LSM) was selected. The overall structure of the motor, which consists of a table to which the permanent magnets (PMs) are attached and two fixed electromagnet (EM) lines between which the PMs move, was selected based on the simplicity of the structure and the ease of gap adjustment. The dimensions of the EMs and PMs are optimized numerically to achieve a high thrust density that can provide an acceleration of 100G or greater to the mover, which comprises PMs, spacers, and a frame. The prototype MPM LSM has a working range of 1.5 m. The mover, including the guide parts, has a length of 444 mm and a mass of 4.79 kg. The measured peak thrust was greater than 5 × 103 N, and the measured average thrust was 4.03 × 103 N. The prototype driven by a rectangular current command produced a maximum acceleration of greater than 100G and a velocity higher than 12 m/s for a moving distance of 0.6 m.
Date of Publication: Feb. 2013