Nippon Seiki Co., Ltd.

Nippon Seiki K.k.

Hiroyasu Numaya

Koichi Sato

Kouichi Satoh

Masaru Iwahashi

Atsushi Fujita

Kouichi Jinushi

Keiji Tsurumaki

Koichi Jinushi

Hiroyuki Matsuda

Toru Kayano

Motohiko Ogawa

Hitoshi Sato

The invention provides a movable magnet type instrument able to reduce cost and an instrument device using this movable magnet type instrument. The movable magnet type instrument M has a rotor magnet magnetized such that adjacent magnetic poles are poles different from each other; a pair of coils arranged around this rotor magnet and having winding central axes C , C crossing each other without being perpendicular to each other; control means for processing an input signal based on a measured amount and supplying a driving signal mutually having a different electrical angle to each of the coils and rotating and operating the rotor magnet; and a pointer for rotating the rotor magnet as a driving source; wherein, when the number of magnetic poles of the rotor magnet is set to n and an acute angle formed by crossing the winding central axes C , C is set to r, the acute angle r is set to an angle calculated by 360/2n (n is a multiple of 2 equal to or greater than 4).

Movable-magnet type meter and meter device using this movable-magnet type meter

A stepping motor type indicator provided with unambiguous stable points having a holding force in a non-excited condition sufficient to suppress undesirable movements of a pointer. The stepping motor type indicator includes a stepping motor (,) having a rotor (,) with an output shaft (,) and stators (A, B). Yokes (,) have a plurality of pole teeth (,) extending toward curved outer surfaces of the rotor. The pole ends of a specific pole tooth (,) chosen from one of the plurality of pole teeth is made to have a pole end area different than that of the remaining pole teeth. This structure produces unambiguous stable points (&ldquo;a&rdquo;-&ldquo;l&rdquo;) and produces strong holding forces so that an attractive force exerted by the stable point (&ldquo;a&rdquo;) on the pointer (,) toward stopper pin (,) is increased to positively suppress undesirable movements of pointer (,).

Stepping motor type indicator having a pole tooth with reduced end area

Stepping motor with rotor and stator having related axial width

Connection structure of stepping motor

It is intended to provide a stepper motor having windings which are easy to wind. Increase in size of the motor itself can be circumvented. First and second coil blocks 20 and 21, respectively, are formed by first and second annular bobbins 27 and 34, respectively, and by first and second annular yokes 28, 29, 35, 36. The bobbins have winding portions 25, 32 on which first and second exciting coils 26, 33, respectively, are wound. A magnet rotor 22 having a rotating shaft 41 mounted thereto is rotatably held in a gap 43 between the coaxial laminations of the coil blocks 20, 21. Connector terminals 37 and 38 consisting of first connection portions 37a, 38a and second connection portions 37b, 38b are buried in the annular bobbins 34 of the second coil block 21. The first connection portions 37a, 38a protrude from a flange 30 in a direction substantially perpendicular to the axis of the rotating shaft 44. The second connection portions 37b, 38b extend from the winding portion 32 in a direction substantially parallel to the axis of the rotating shaft 44. Terminal ends 26a, 33a of the first and second exciting coils 26, 33 are electrically connected with the protruding ends of the first connection portions 37a, 38a. The protruding ends of the second connection portions 37b, 38b are electrically connected with a printed-wiring board (external electric apparatus) 45.

Stepper motor

Growing community of inventors

Niigata, Japan

Hiroyasu Numaya