1
Noriaki Hishida, Kuniyasu Iwazaki: Spindle motor. Nippon Densan Corporation, McCormick Paulding & Huber, September 3, 1991: US05045738 (46 worldwide citation)

A spindle motor having a shaft member secured to a fitting member, a rotary member which is rotatable relatively to the shaft member, a rotor magnet fitted to the rotary member in such a manner that the rotor magnet confronts the rotor magnet and a stator, wherein a pair of inner annular grooves are ...


2
Masanobu Chuta, Hiroyuki Yonei, Hideki Nishimura, Yoshikiyo Nagashima: Spindle motor. Nippon Densan Corporation, McCormick Paulding & Huber, August 11, 1992: US05138209 (40 worldwide citation)

Disclosed is a spindle motor comprising: a housing, a hub member which is rotatable with respect to the housing and to which a recording member is attached, and a bearing arranged between the housing and the hub member and having an outer member which is rotatably attached thereto through the interm ...


3
Toshio Fukuda, Shinobu Hattori, Shigenobu Nagamori: Micropump with liquid-absorptive polymer gel actuator. Nippon Densan Corporation, August 9, 1994: US05336057 (38 worldwide citation)

A micropump comprises a pump body member for defining a tank chamber holding liquid, a liquid inlet portion, a liquid outlet portion for discharging the liquid medium in the tank chamber, a liquid outlet portion for discharging the liquid medium in the tank chamber, and an actuator for reducing a vo ...


4
Shuji Takahashi, Eiji Yanai, Fumihiro Morikawa: Fan motor. Nippon Densan Corporation, McCormick Paulding & Huber, August 30, 1994: US05343104 (36 worldwide citation)

A fan motor having a structure which allows a stopper to keep contact with a thrust plate on a circular contact area only, by inserting a shaft through a sleeve bearing, and by attaching the stopper, against the thrust plate, onto the end portion of the shaft. This assures uniform sliding of the thr ...


5
Isao Kaneda, Kouhei Yonemura, Akihiro Okubo: Method of and circuit for starting sensorless motor. Nippon Densan Corporation, McCormick Paulding & Huber, August 10, 1993: US05235264 (35 worldwide citation)

A driving control circuit of a motor having a sensorless stator and a rotor, used for a magnetic disk device, comprising a high-frequency stepping oscillator, stepping oscillator, a timer, a stepping timing generating circuit, a current switching logic, an output driver, and a counter electromotive ...


6
Koji Harada, Takashi Hirata, Fumihiro Morikawa, Shuji Takahashi: Motor and circuitry for protecting same. Nippon Densan Corporation, McCormick Paulding & Huber, November 8, 1994: US05363003 (34 worldwide citation)

A motor is provided which includes a housing, a stator attached to the cylindrical wall of the housing, a sleeve bearing attached to the inner periphery of the cylindrical wall, a rotor rotatably supported by the sleeve bearing, and a rotor magnet attached to the rotor. A plurality of projecting str ...


7
Kuniyasu Iwazaki, Kihachiro Ohta: Spindle motor. Nippon Densan Corporation, McCormick Paulding & Huber, October 29, 1991: US05061868 (31 worldwide citation)

A spindle motor comprising a fixed shaft member, a hub member rotatably supported by the fixed shaft member through bearings, and a magnetic-fluid type sealing mechanism arranged between the fixed shaft member and the hub member. The magnetic-fluid type sealing mechanism has a rotary member mounted ...


8
Shinobu Hattori, Yasuhiro Higuchi, Yoshito Oku: Low profile hydrodynamic motor having minimum leakage properties. Nippon Densan Corporation, McCormick Paulding & Huber, October 10, 1995: US05457588 (31 worldwide citation)

A spindle motor comprises a rotary sleeve; a rotor hub which is integrally rotated with the rotary sleeve; a stationary sleeve; and a stationary support extending upwardly from the stationary part, the rotary sleeve being fitted onto the outer peripheral surface of the stationary support, and radial ...


9
Mineyo Endo, Yosuke Kawate: Starting and control method for brushless DC motor. Nippon Densan Corporation, Lowe Price LeBlanc & Becker, July 6, 1993: US05225759 (29 worldwide citation)

Starting, accelerating and rated rotation of a rotor is carried out without any detector for the rotor position. A motor is controlled with an openloop circuit a short time in a starting area of low speed rotation, and thus the motor can be certainly started. In a rated rotation area, turning timing ...


10
Shuji Takahashi, Eiji Yanai, Fumihiro Morikawa, Yosuke Kawate: Fan motor. Nippon Densan Corporation, July 25, 1995: US05436519 (27 worldwide citation)

A fan motor has a pair of ball bearings placed in the vicinity of each end of an inner side of a bearing race. A plurality of projections are sequentially placed circumferentially around a center portion of the bearing race to axially locate both the ball bearings. A plurality of low-profile project ...