Japan Servo Co.,ltd.

Junichi Ikeda

Masahiro Mimura

Naoya Ito

Takeaki Tamabuchi

Shoji Ohiwa

Kazuo Ohnishi

Yoichi Nagata

Hideo Saito

Tomokazu Uchiyama

Kouji Yoneda

A brushless DC motor wherein a rotor has a motor shaft, a rotor yoke mounted on the motor shaft, and a ring-shaped magnet magnetized so as to have a plurality of magnet poles in the circumferential direction thereof, and held by the rotor yoke. A stator has first and second stator yokes each having main magnetic poles extending in the radial direction from the center thereof, magnetic pole pieces extending in the vertical direction from tip ends of the main magnetic poles along an inner peripheral surface of the ring-shaped magnet, a center yoke surrounding the motor shaft for connecting magnetically said first and second stator yokes, a winding assembly having an annular winding, and a printed wiring board, on which the annular winding, a electromagnetic conversion element and a driving circuit are mounted.

Brushless DC motor

The present invention relates to an oil-retaining bearing for a rotary machine. In the oil-retaining bearing for a rotary machine according to the present invention, a first lock section is provided in a bearing housing; a first thrust spacer is relatively rotatably mounted in the vicinity of the end face of the oil-retaining bearing for a rotary machine; the first thrust spacer is provided with a second lock section, in engagement with the first lock section; a second thrust spacer is relatively non-rotatably mounted on the rotating shaft; and a third thrust spacer having elasticity is relatively rotatably mounted on the rotating shaft; the third thrust spacer being interposed between the first thrust spacer and the second thrust spacer. Furthermore, in the oil-retaining bearing structure for a rotary machine according to the present invention, a small hole is provided in the bearing housing through which the rotating shaft is mounted; at least one axial groove is formed in the inner surface of the bearing housing; and at least one radial groove is formed in the inner surface of the bearing housing; the axial groove being connected with the small hole section through the radial groove.

Oil-retaining bearing structure for rotary machine

Growing community of inventors

Gunma, Japan

Junichi Ikeda