Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-09-28
1999-10-26
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
310268, 310254, H02K 3710
Patent
active
059734264
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a small motor for use in an information-communication apparatus, an audio-visual apparatus or the like, and a motor for use in a portable pager and a portable telephone or the like generating vibrations to be transmitted to a human body.
BACKGROUND ART
In order to meet the increasing needs for reducing the overall sizes, increasing the degree of precision and improving the reliability of apparatus for information-communication, audio-visual application, more and more number of brushless motors are being used in place of motors with brush. The motors with brush are also required to be compact and thin; accordingly, many of the conventional frame cases of a cylindrical shape are replaced by those of an oval shape among the core motors. Even among the coreless motors, frame cases of oval and square shapes have been developed, and motors having such frame cases are already in use in portable communication appratus. The battery-driven motors for use in portable apparatus have to meet stringent dimensional requirements in thickness direction; in addition, the power consumption must be low in view of battery life. It has become difficult to raise the efficiency of a motor further by using a high energy-density magnet among the motors having conventional oval or cylindrical structure.
Motors of the above category have a structure as shown in FIG. 58, FIG. 61 or FIG. 62. The structure is described in the following.
FIG. 58 is a cross sectional view showing a conventional inner-rotor type brushless motor.
As shown in FIG. 58, a cylindrical magnet 130 is fixed to a shaft 131 inserted through the central hole, one end of the shaft 131 is held by a bearing 133 provided on a frame case 132 while the other end is held by a bearing 134 provided on a bracket 136; thus an inner rotor is formed which is supported at both ends. The magnet 130 fixed to the shaft 131 which is rotatably supported by bearings 133, 134 is magnetized in the N and S poles. A cylindrical core 128 is provided with three salient poles, which are wound around with a coil 129. The magnet 130 is rotated by magnetic flux generated by electricity supplied to the coil 129.
A circuit board 135 is mounted with electronic components. Each of the salient poles of the core 128 is wound around with coil to form a three-phase coil of phase U, phase V and phase W, respectively. The above electronic circuit controls so as the phase of induced voltage generated at each of the three phases deviates relative to one another by 120. Thus, it is driven as a three-phase brushless motor.
FIG. 61(a) is a cross sectional view showing a conventional core motor having an oval cross sectional shape for use in a portable pager, FIG. 61(b) shows the motor sectioned by a plane perpendicular to the shaft.
As shown in FIG. 61(a) and FIG. 61(b), a core 142 made of stacked silicon steel sheets is fixed around a shaft 139, a resin insulator shaped to a same shape as the core is inserted in the core 142, and a rectifying terminal unit 144 is thrusted to the shaft 139. The core 142 is wound around with a coil 143, the electric conduction point of coil 143 is aligned to a specified position of the rectifying terminal unit 144 for soldering. An armature coil assembly of a motor is thus structured. The rectifying surface of rectifying unit 144 is lapped, and then the entire assembly of armature coil is washed. A sintered bearing 140 is fixed in the centre of frame case 137. In the frame case 137 which is shaped oval, an arc-shape magnet 138 is provided at the inside of each of the two arc-shape sides of the frame case 137, the inner side of the two magnets is magnetized so as to have opposit pole relative to each other. The shaft 139 of washed armature coil assembly is inserted to the sintered bearing 140, and a bracket 147 provided with a brush 146 and a sintered bearing 141 is affixed to the frame case 137 to complete a motor.
Magnetic flux comming out of the inner surface of one magnet 138 goes through core 142, enters into the inner sur
REFERENCES:
patent: 4739201 (1988-04-01), Brigham et al.
patent: 4899072 (1990-02-01), Ohta
patent: 4990806 (1991-02-01), Kikuchi et al.
patent: 5245239 (1993-09-01), Kuyama
patent: 5723921 (1998-03-01), Sugiura
Fujinaka Hiroyasu
Furuya Miyuki
Kuyama Kouji
Teshima Hiroyoshi
Jones Judson H.
Matsushita Electric - Industrial Co., Ltd.
Ramirez Nestor
LandOfFree
Motor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-768158