Minebea Company, Limited

Taichi Nishio

Yuzuru Suzuki

Hiroshi Sano

Sakae Fujitani

Kunitake Matsushita

Taketoshi Ohyashiki

Takayuki Yamawaki

Kazuo Muramatsu

Naoyuki Harada

An inner rotor type motor has a plurality of stator magnetic poles projecting inwardly from a stator yoke surrounding the outer periphery of a shaft, of which a plurality of stator magnetic poles, some, at least the same number as the number of the phases of the driving voltage, are each provided with a driving coil and a decelerating coil wound around the same and form long stator magnetic poles ( ), while the remaining stator magnetic poles are each made shorter than the long stator magnetic poles, not provided with a winding, and form short stator magnetic poles. Further, the motor has a rotor rotating centering around the shaft and having rotor magnets made up of permanent magnets disposed in a confronting relationship with salient poles of the stator magnetic poles.

Motor structure for use with optical disks

The object of the present invention is to provide a rotary electric machine that provides bobbins with good assembling efficiency and allows no dislocation of the stator. A motor,comprises a case,, a stator,secured inside the case,, a rotor,formed into one piece with a rotating shaft,. The stator,comprises stator yokes,and the stator yokes are secured in a radial manner in the case,. Furthermore, resin,is filled in between the stator,and the case,with a space for the rotor being left. The stator yokes,comprise a salient pole,, a bobbin,for holding the salient pole,, and a magnetic wire,wound around the bobbin,. A collar,of the bobbin,is formed so as to contact each other with notches,formed on two, upper and lower edge portions. Accordingly, combining two bobbins,allows through-holes,penetrating the collar,thereof. This allows the stator to be firmly assembled, provides good assembling workability, and allows no dislocation owing to resin flowing when the resin is injected.

Rotary electric machine and bobbin thereof

The object of the present invention is to provide a rotary electric machine which has high assembly accuracy, high heat dissipating efficiency, and excellent durability at the bearing portion. A motor comprises a case, a stator secured within the case, and a rotor formed into one piece with a rotary shaft. The case is provided, on both end faces, with flanges, and one of the flanges is provided with a ball bearing. A stator is radially secured within the case, resin is filled in between the stator and the case with a space of the rotor being left, and a bearing housing and a boss are formed on one side. An open portion is formed in between ribs of the bearing housing, and inserting the bearing into the bearing housing causes a part of the bearing to be exposed through the open portion to fixedly contact with the flange. This allows supporting the bearing securely, and allows frictional heat generated, and the like, to dissipate to the outside via the flange. Furthermore, this allows mounting bearings with high accuracy, and reducing noise accompanying mechanical and electromagnetic vibrations.

Rotary electric machine and bearing structure thereof

A brushless DC motor, having a rotor with a cylindrical rotor magnet supported rotationally by a shaft held by bearings mounted on a substantially planar base plate, and a stator supported by the base plate, and including a plurality of radially spaced salient poles holding stator coils formed by windings of magnet wire. Opposing surfaces of the rotor and each salient pole are defined by a first surface of a magnetic core of the salient pole, which is received in a bobbin, and a second surface of the magnetic core orthogonal to the first surface, and the rotor magnet has permanent magnet poles forming a first surface opposing the first surface of the magnetic core, and a second surface opposing the second surface of the magnetic core. A tip of each magnetic core is received through a hole formed in the base plate.

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Shizuoka-ken, Japan

Taichi Nishio