International Journal of Applied Electromagnetics and Mechanics 15 (2001/2002) 129–133 129 IOS Press Basic characteristics of new interior permanent magnet linear pulse motor Hiroyuki Wakiwaka a,* , Norhisam Misron a , Akinori Kamiya a , Hisashi Yajima b , Kazuya Tamura b , Nobuhiro Fujiwara b , Masayuki Hosono b and Susumu Takada b a Faculty of Engineering, Shinshu Univ., 4-17-1, Wakasato, Nagano-shi, Nagano, 380-8553, Japan b SMC Corporation, 4-2-2 Kinunodai, Yawara-mura, Tsukuba-gun, 300-2493, Japan Abstract. In recent years, linear motors are gaining wide popularity in the field of office and factory automation. Therefore, small and high thrust linear motors are needed. This paper deals with a proposal of a new interior permanent magnet type linear pulse motor and it’s characteristics. The thrust density of the interior permanent magnet linear pulse motor is larger compared to the other type linear pulse motors. 1. Introduction In recent years, linear motors have been applied in a wide field. A linear motor differs from a rotation motor, which has a simple structure and is easy to miniaturize. In the field of office and factory automation, a linear motor that is small and has high thrust is required. To design a high thrust linear motor, a new type of magnetic circuit for the linear pulse motor (Interior Permanent Magnet Linear Pulse Motor, IP-LPM) with permanent magnets which are embedded in the mover were proposed. The finite element method (FEM) was used to analyze and design the IP-LPM. In this paper the basic characteristics values of the proposed IP-LPM are examined. The other types of linear pulse motor characteristics values are also compared. In this paper we discuss on (a) the structure and operation principle of the IP-LPM, (b) comparison of the magnetic circuits, (c) comparison of the basic characteristic of the IP-LPM and other. 2. The structure and operation principle of the IP-LPM 2.1. The structure of the IP-LPM Figure 1 shows the basic structure of the IP-LPM. The secondary, mover, of the IP-LPM is composed of a mover yoke and mover magnets. The permanent magnets are embedded on the surface of the mover core. The permanent magnets are magnetized in the stroke direction as shown in Fig. 1. The primary, stator, of the IP-LPM is composed of the stator core and the coils. The stator are set up at the double * Corresponding author: Fax: +81 26 269 5190; E-mail: wakiwak@gipwc.shinshu-u.ac.jp. 1383-5416/01/02/$8.00  2001/2002 – IOS Press. All rights reserved