Japan Servo Co.,ltd.

Hitachi, Ltd.

Sachio Hatori

Toshimi Abukawa

Yuji Takagai

Yuji Enomoto

Takashi Ando

Makoto Ochiai

Hiroshi Nishida

Masashi Kitamura

Miyoshi Takahashi

Kenji Tomida

Yasuaki Motegi

Shoji Ohiwa

Tomoaki Inoue

Kazuo Ohnishi

Yuji Nishimura

Masaaki Nakano

Takashi Kono

Yasuaki Moteki

Kiyomichi Inoshita

Tomoyoshi Maruyama

Takeru Sato

Kazuto Nagai

The invention relates to a motor with a frequency generator attached thereto, equipped with the frequency generator (FG) for detecting a rotational speed of the motor. The motor with the frequency generator attached thereto comprises a magnet having 10 poles of main magnetic poles for driving the motor, and frequency generator magnetic poles, provided on an end face of the magnet, in the direction of a motor axle, a stator yoke disposed opposite to the inner circumference of the magnet with a gap interposed therebetween, and a printed wiring board disposed so as to oppose the end face of the magnet with a gap interposed therebetween, wherein a first coil pattern and a second coil pattern, in rectangular waveform, having a plurality of power generation wire-elements radially formed, respectively, are disposed a surface of the printed wiring board, opposite to the end face of the magnet, a rotational speed adopted is in a range of 300 to 500 r/min, an inside diameter of the magnet is in a size range of 40 to 65 mm, the number of magnetic poles of the frequency generator magnetic poles is in a range of 54 to 157, corresponding to integer multiples of the number of the magnetic poles of the main magnetic poles, and the number of the power generation wire-elements of the first coil pattern and the second coil pattern, respectively, is equal to the number of the magnetic poles of the frequency generator magnetic poles, and the main magnetic poles are aligned with the frequency generator magnetic poles, respectively.

Motor with frequency generator and office automation equipment using same

In an abduction-type motor having a divided core() formed by dividing a stator core into plural blocks and a motor stator having such a structure as the divided core may be reassembled, the motor has a coil winding framecontinuously formed a continuous unit of coupling parts, a part of which is flexible and made of insulation material, embedded into the individual divided cores, and a coilarranged and wound by supporting the divided core so that the teeth top parts of the divided core may be directed inside and located on a circle, in which its coil winding structure has the number of coil stages at the teeth top part (external peripheral part) of the divided core larger than the number of the coil stages at the internal peripheral part, and the diameter of the teeth top part of the divided core after assembly is identical to the diameter of the teeth top part while coil winding work, and the length of the crossover linebetween the coil windings is made enough to be equivalent to a single slot or more, not excessive or not insufficient.

Abduction-type motor and fabrication method of motor stator thereof

A PM-type electric rotating machine comprises a rotation axis, a rotor that rotates together with the rotation axis and a stator that rotatably supports the rotation axis. The rotor has a closed-end-cup-shaped holder that is mounted at one end of the rotation axis and a permanent magnet fixed on an inner surface of a cylindrical portion of the holder. The stator has a housing bush that supports the rotation axis in an axis hole formed through the center of the housing bush, twelve stator cores that are radially mounted around the housing bush to face the outer tip ends thereof to the permanent magnet with an air gap, and coils that are wound around the stator cores via insulators. The inner base portions of the stator cores are connected to one another with pressure so as to form a ring-shaped yoke by mounting the stator cores around the housing bush.

Permanent magnet type electric rotating machine

An electric rotary machine has a concentrated winding stator and a rotor facing the stator with a gap therebetween. The stator has M number of stator magnetic poles extending in the radial direction from an annular yoke, pole pieces each extending in the circumferential direction of the rotor from the tip end of each of the stator magnetic poles, and windings wound around the stator magnetic poles. The rotor having a permanent magnet with P number magnetic poles, wherein P:M&equals;6n&minus;2:6n, or P:M&equals;6n&plus;2:6n, where n is an integer not less than 2, and the figure of each of the pole pieces is so determined that a gap formed between the pole piece and the rotor is increased going toward the both ends of the pole piece.

Electric rotary machine having concentrated winding stator

A bearing device where a sliding bearing rotatably supporting a shaft is molded with an inexpensive sintered material, three asymmetrical circular arc-shaped radial bearings are formed in the inner peripheral surface of the shaft, taper land-shaped thrust bearings are formed in the opposite end surfaces of the radial bearing surface, T-shaped bubble removing means which is constituted by axial and radial flow passages formed in the shaft opposed to the radial bearing is provided, and magnetic fluid is used as a lubricant. A magnetic disk unit using the bearing device is also disclosed.

Bearing device and spindle motor provided with the bearing device

Growing community of inventors

Kiryu, Japan

Sachio Hatori