FR2786336A1 - BRUSHLESS MOTOR AND ASSEMBLY METHOD THEREOF - Google Patents

Abstract

The brushless motor for portable information equipment can be reflow soldered and densely and efficiently mounted thereon so that the coupled portion between the motor and the substrate has high impact resistance, thereby providing equipment small and reliable. The brushless motor includes a housing having a bottom surface located adjacent and opposite to an equipment substrate; a plurality of pads (2a, 2e) on the lower surface which can be connected to the substrate; a stator (1), a bearing device (3) and a rotor (4), the stator (1) comprising a stator core (6) and a coil (7) wound around the stator core (6), the rotor ( 4) comprising a magnet (13) is supported by the bearing device (3) by rotatingly surrounding the periphery of the stator (1), the rotor (4) further including a circular mass (14).

Description

BRUSHLESS MOTOR AND ASSEMBLY METHOD THEREOF

  The present invention relates to the structure of a

  small flat brushless motor and its assembly process.

  Portable information equipment (hereinafter called "equipment") including, for example, cellular telephones, is desired to be smaller, lighter and thinner in order to give a sophisticated impression and - in order to withstand long-term use. Equipment manufacturers are making various efforts to meet these demands. They are trying to reduce the size and power consumption of the electronic parts integrated into the equipment, to use multilayer wiring substrates to allow the electronic parts to be integrated in dense form while increasing productivity and to configure enclosures using light metal such as magnesium to reduce the thickness of the equipment and give it a sophisticated appearance. There are similar requests for flat brushless motors used as a source

equipment training.

  A vibration generation function for silent calls is now essential for cell phones. The vibration generation function is generally implemented by a vibrating motor with an eccentric mass. This is due to the fact that such an engine has excellent characteristics such as small size, low power consumption and low price and is thus advantageous in reducing the mass of the equipment. The vibrating motor must

  also serve to enhance the value of the equipment.

  The requirements of a vibrating motor and a flat brushless motor used as a source of drive for equipment (hereinafter, these motors can be broadly and simply called "brushless motor" or "motors") which should be met for improve the value of the equipment will be reviewed. First, brushless motors must be adapted for the improved degree of equipment integration. Thus, as in other massive electronic parts, the brushless motor can desirably be mounted on an equipment substrate using "surface mount technology". This is due to the fact that in the case of a multilayer substrate, the degree of integration can be reduced if the terminals are passed through holes formed in the substrate. In order to improve the degree of integration, the brushless motor is desirably configured by being mounted close to the adjacent electronic parts so as to achieve a density

high.

  Second, the brushless motor must be adapted for the same mounting process as other massive electronic parts in order to improve the productivity of the equipment. Thus, the brushless motor desirably has a configuration and a heat resistance compatible with a reflow soldering process. It is also desirably configured by being mounted efficiently using the same machine

  assembly than other massive electronic parts.

  Third, the brushless motor must be suitable for the reduced size and mass of the equipment housing. Thus, it desirably presents a

high impact resistance.

  The reasons for the demand for high impact resistance will be described. Of course, high impact resistance is required to ensure that the equipment will not be

  not destroyed, even if you accidentally drop it.

  Common common methods provide a certain amount of space inside the equipment and integrate the motor into the equipment via a body

T- IT

  elastic. In recent years, however, the demand for reduced size and thickness has prevented the provision of space for the elastic body. If an attempt is made to surface mount the motor on the same substrate as other electronic parts in order to meet demand, the brushless motor is directly attached to the substrate, thereby preventing shock from being

  absorbed, as in elastic support structures.

  - In addition, attempts are made to form the housing of the equipment in light metal such as magnesium or aluminum, as described above. Despite its low mass, such a metal has a much higher rigidity than resin, so its damping capacity is insufficient. Consequently, a shock of unprecedented importance is given on the substrate fixed to the housing and directly transmitted to the motor fixed to the substrate. It follows that a very high impact resistance is necessary for the engine and its connection. Consequently, the desired value of the impact resistance of the motor is conventionally between 29,400 and 49,000 m / s2 (3,000 and 000 G), but now between 98,000 and 196,000 m / s2 (10,000 and

000 G).

  In addition, this impact resistance is desirably encountered simply by heating and melting a solder on the substrate in order to weld the motor to the substrate (reflow) without passing the terminals through through holes formed in the substrate (mounting surface). Even endure a

  reflow heating temperature (250) is difficult.

  The inventor tries to find a conventional technique which satisfies these requirements, but to no avail. Thus, through many studies, the inventor has completed the present invention. An engine, according to the present invention, is of a flat type having a height smaller than the width, so that it is sometimes called "engine

  vibrating flat "or" flat brushless motor ".

  Next, brushless motors will be described in se

  focusing on classic assembly processes.

  A small, flat brushless motor typically includes a metal base on which various parts are assembled. Since the motor is a rotational source of energy for the equipment, it must be mounted in the equipment in order to maintain sufficient rigidity and the metal base must be precisely formed - so as to be suitable as a criterion for motor assembly. In order to assemble the motor, the base is placed on a pallet (a positioning work table) and the parts are then mounted on the base. According to this assembly process, before placing the base on the pallet, the fact of knowing whether the base is placed upside down or not is checked and its direction and position are adjusted. The time required for this operation, however, tends to increase as the size of the motor decreases. This is due to the fact that it is more difficult to handle smaller parts. This trend is not only found in the positioning of the motor base, but also in the assembly of electronic parts on a printed circuit board. Electronic parts are difficult to mount so

  effective on a small circuit board.

  In addition to reducing the size, there is a strong demand for

  reduce engine mass for portable equipment.

  However, when trying to reduce the size and mass of the engine, the characteristics of the engine should not be sacrificed. Thus, a rotor and a stator must naturally have a specified size and mass. Consequently, it is now necessary to reduce the volume and the mass of the peripheral elements including the structures other than the rotor and the stator, i.e., a structure to hold the rotor and the stator and a structure to connect electrically the stator and the

external device together.

  The method of assembling a printed circuit board called the "connected substrate" is conventionally commonly used to produce integrated circuits for various equipment. When the circuit boards have small or different external shapes, this method arranges a large number of such circuit boards and connects them together using bridges or frames so as to form a shape which is easily manipulated by a machine. mounting of electronic parts. After the electronic parts have been mounted on these circuit boards, the bridges are cut and removed so as to obtain sets of printed circuit boards so as to complete the assembly. This process, however, is still disadvantageous if size reduction is still required. In addition, as the size of the printed circuit board decreases, the area occupied by the bridges or frames increases relatively to reduce the use of material resources. In addition, despite a request to further reduce the size of the printed circuit board, when a shearing machine is used to cut the bridges, contact with the cutting edge and stress caused by shearing should be avoided. It follows that none

  part cannot be placed near the sheared position.

  The bridges can be folded or broken, but the separate part forms a rough breaking surface which degrades the appearance and dimensional accuracy. Because of these disadvantages, this process is unsuitable for small parts. In addition, since the separation is carried out after the completion of the assembly, a shock associated with shearing can degrade the quality of the

Finished products.

  Thus, an assembly method is desired which solves these problems by configuring a compact motor by mounting the parts on a densely printed circuit board. In an attempt to meet these demands, another goal is to reduce the volume and mass of elements such as the structure to hold the rotor and the stator and the structure to electrically connect the stator and

- the external device together.

  A first object of the present invention is to fulfill the above requirements, that is to say, to contribute to improving the degree of integration of the equipment. Thus, the motor must be configured by being mounted on the substrate of the equipment using SMT technology (Surface Mount Technique) and having to be mounted close to the adjacent electronic parts of

  so as to achieve a high density.

  A second goal is to help improve the productivity of the equipment. Thus, the engine must have a configuration and a heat resistance compatible with the reflow soldering process and must be configured by being mounted effectively in

  using the same assembly machine.

  A third goal is to help reduce the size and mass of the equipment. So the engine should have

  sufficient impact resistance.

  A fourth goal is to improve assembly productivity. Thus, the present invention should provide a structure which is easier to handle and assemble and a method of assembly for such a structure. A total aim of the present invention is to achieve the above aims for providing portable information equipment having a size and a mass.

* VII1

  reduced, improved productivity, and values

added high. -

  In order to achieve these goals, a brushless motor according to the present invention comprises a housing comprising a lower surface, a lateral surface and an upper surface, the lower surface being located adjacent and opposite to a substrate of an equipment; pairs of terminals on the bottom surface which can be - mechanically or electrically connected with the equipment substrate; a stator, a bearing device, and a rotor inside the housing, the stator comprising a stator core and a coil wound around it, the rotor comprising a magnet and supported by the bearing device so as to surround rotatably the periphery of the stator, the rotor further including an imbalance means or a housing drive means which protrudes from the part of

  housing and which pivots with the rotor.

  Additionally, in order to solve the problem with brushless motor assembly, a motor assembly method, in accordance with the present invention, uses a motor base connector. The motor base connector includes motor bases, each using a plate-like material as the base material and includes a plurality of motor bases and a skeleton that remains after these motor bases have been punched, the plurality of engine bases being pushed back is kept in the skeleton. Each motor base is completed by performing the steps of attaching the bearing and stator device to a stator mounting surface, assembling the rotor on the

  bearing and removing the motor from the skeleton.

  Next, the structure of the brushless motor, and its method of assembly in accordance with the present invention

are described in detail.

  First, a flat brushless motor according to a first aspect of the present invention is designed to meet the following requirements: (a) The motor has a housing comprising a lower surface, a side surface and an upper surface. (b) The lower surface is located adjacent and opposite to the substrate of an equipment. The motor comprises on this lower surface pairs of terminals which can be connected mechanically or electrically with the substrate of the equipment. The pairs of terminals are arranged on both sides around a line running

  the centroid or center of gravity of the lower surface.

  (c) The motor includes a stator, a bearing device and a rotor, all inside the housing. The stator has a stator core and a coil wound around the stator core. The rotor has a magnet and is supported by the bearing device so as to

  circle the periphery of the stator.

  (d) The rotor further includes an imbalance means. With these terminals, the motor can be connected to the equipment substrate by the reflow soldering process (solder joint). The housing facilitates handling of the engine. When prevented from protruding from the lower surface area laterally outward, the terminals of the lower surface may be arranged close to the adjacent electronic parts. In addition, although the terminals may still protrude perpendicularly from the lower surface so as to engage in through holes in the substrates of the equipment, such an embodiment whose terminals are connected on the surface to the substrate of the equipment is basically

desirable for equipment.

  In addition, since the terminals are arranged so as not to concentrate in the lower surface part, they can cooperate to effectively withstand a shock, thereby providing a significant holding force. Desirably, the shock can be more evenly distributed by placing the terminals symmetrically by point, line or rotation around the centroid or center of gravity

from the bottom surface.

  In accordance with a more detailed explanation, the expression "center of gravity" can be paraphrased as the point where the center of gravity of the whole is projected vertically onto the lower surface. In addition, the centroid signifies the center of gravity of a plane figure. A flat brushless motor, in accordance with a second embodiment of the invention is adapted to achieve the following requirements: (a) The motor comprises a housing comprising a lower surface, a lateral surface and a surface

superior.

  (b) The lower surface is located adjacent and opposite to a substrate of an equipment. The motor has on its lower surface pairs of terminals which can be mechanically or electrically connected with the substrate of the equipment. The pairs of terminals are arranged on both sides around a line passing through the centroid or the center of gravity of the lower surface. (c) The motor includes a stator, a bearing device and a rotor, all inside the housing. The stator has a stator core and a coil wound around the stator core. The rotor has a magnet and is supported by the bearing device so as to

  circle the periphery of the stator.

  (d) An external drive means which rotates with the

  rotor protrudes from part of the housing.

  Preferably, the external drive means protruding from the housing is, for example, a shaft, a gear, a pulley or a part of the rotor. It reasonably protrudes from the upper surface but may protrude from the lower surface or part of the surface

  lateral depending on equipment requirements.

  A flat brushless motor, in accordance with a third embodiment of the invention is designed to meet the following requirements: (a) The motor comprises a housing comprising a

  lower surface, one side and an upper surface.

  (b) The bottom surface is located adjacent and opposite to an equipment substrate. The motor has on the side of the housing pairs of terminals which protrude from the side by approximately the same height as the bottom surface and can be mechanically or electrically connected with the substrate of the equipment. The pairs of terminals are arranged on both sides around a line passing through the centroid or center of gravity of the lower surface. (c) The motor includes a stator, a bearing device and a rotor, all inside the housing. The stator has a stator core and a coil wound around it. The rotor has a magnet and is supported by the bearing device so as to surround it

  the periphery of the stator.

  (d) The rotor further includes means for

imbalance.

  In this way, the terminals protrude from the side of the housing, so that these terminals can be provided in addition to the terminals inside the lower surface to further increase the number of terminals, thereby increasing the fixing resistance. This configuration can I TTi also correspond to the reflow process which heats

locally the limits exceeding.

  A flat brushless motor according to a fourth embodiment of the invention is designed to meet the following requirements: (a) The motor comprises a housing comprising a lower surface, a lateral surface and an upper surface. (b) The bottom surface is located adjacent and opposite to an equipment substrate. The motor has on the lower surface of the housing pairs of terminals which protrude from the side of the side of approximately the same height as the lower surface and can be mechanically or electrically connected with the substrate of the equipment. The terminal pairs are arranged on both sides around a line passing through the centroid or the center of gravity of the lower surface. (c) The motor includes a stator, a bearing device and a rotor, all inside the housing. The stator has a stator core and a coil wound around the stator core. The rotor has a magnet and is supported by the bearing device so as to

  circle the periphery of the stator.

  (d) An external drive means which rotates with the

  the rotor also protrudes from the part of the housing.

  In this way, the terminals protrude laterally from the housing, as in the motor according to the third embodiment, so that these terminals can be provided in addition to the terminals inside the lower surface to further increase the number of terminals, thereby increasing the fixing resistance. This configuration can also correspond to the method of

  reflow which locally heats the overhangs.

  _- F IVl A flat brushless motor, in accordance with a fifth embodiment of the invention is designed to meet the following requirements: (a) The motor comprises a housing comprising a lower surface, a lateral surface and an upper surface. (b) The lower surface is located adjacent and opposite to the substrate of an equipment. The motor has on the lower surface of the housing a pair of terminals which can be mechanically or electrically connected with the substrate of the equipment. The pairs of terminals are arranged on both sides around a line passing through

  the centroid or center of gravity of the lower surface.

  (c) The motor includes a stator, a bearing device and a rotor, all inside the housing. The stator has a stator core and a coil wound around the stator core. The rotor has a magnet and is supported by the bearing device so as to

  circle the periphery of the stator.

  (d) The rotor further includes an imbalance means. The housing allows the motor to be transferred using a loading mandrel from an automatic electronic assembly machine and then to be automatically loaded and welded to the equipment substrate. The mandrel section desirably receives a suction mandrel, a gripping mandrel and a

  magnetic chuck, as shown below.

  A flat brushless motor in accordance with a sixth embodiment of the invention is adapted to achieve the following requirements: (a) The motor includes a housing comprising. a bottom surface, a side surface and a surface

  upper and further includes a mandrel section.

  (b) The bottom surface is located adjacent and opposite to an equipment substrate. The motor has on its lower surface or side of the housing pairs of terminals which can be mechanically or electrically connected with the substrate of the equipment. The pairs of terminals are arranged on both sides around a line passing through the centroid or the center of gravity of the

lower surface.

  (c) The motor includes a stator, a bearing device and a rotor, all inside the housing. The stator has a stator core and a coil wound around the stator core. The rotor has a magnet and is supported by the bearing device so as to

  circle the periphery of the stator.

  (d) An external drive means which rotates with the

  rotor, moreover, protrudes from the housing part.

  As in the motor according to the fifth embodiment, this housing allows the motor to be transferred using a loading mandrel of an automatic electronic assembly machine and then to be automatically loaded and welded to the substrate of the 'equipment. The mandrel section desirably corresponds to a suction mandrel, a gripping mandrel and a magnetic mandrel, as shown

below.

  Additionally, in accordance with the flat brushless motor of the present invention, the mandrel section includes a suction surface which is located on the top surface and to which a suction mandrel can be opposed. This suction surface allows the motor to correspond to the suction mandrel most commonly used in machines for assembling electronic parts. The size of the surface aspirated on the upper surface adapts to many automatic assembly machines if the surface is flat and has a diameter of at least 3 mm or more -------- T- t II tZ and desirably 4 mm or more. The suction surface can be in the form of a ring. Both an inclined surface and a spherical surface can be mounted as a mandrel. In addition, according to the brushless motor of the present invention, the mandrel section includes two parallel planes located on the side extending approximately perpendicular to the bottom surface or two parallel edges located on the side and extending parallel to the bottom surface. . This configuration allows the electronic assembly machine to easily pick up, load and align the motor and also allows the alignment to be controlled easily. Alignment can also be achieved by using a grip mandrel to secure the two parallel edges extending parallel to the bottom surface. If the engine appears as an n-sided polygon, as can be seen from the top surface ((n) is an even number greater than or equal to 4), the shape of the engine is similar to a circle and thus serves to save space, while allowing the motor to be taken up by the mandrel. If the motor appears as an oval or a similar shape, as can be seen from the upper surface, this shape contributes to further enlarge the internal space and is preferable in the housing inside other parts electronic devices such as a driver. If the motor appears as two parallel lines located adjacent to the outer circumference of a circle, as can be seen from the top surface, the shape of the motor is very similar to a circle and thus serves to save space, while allowing the motor to be taken up by the mandrel. If the engine appears as a combination of a base with two parallel planes and a cylinder, a cover formed like a cylindrical cup can be easily produced -g1 -I - - - -7 T to reduce costs. If an arched cover is mounted on a base to surround the outside of the rotor, then, despite the lack of protection for the inside of the motor, the arched cover helps to save resources to reduce costs. In addition, the mandrel section of the brushless motor of the present invention includes a ferromagnetic element forming the upper surface. This ferromagnetic element on the upper surface allows the motor to be transferred by an automatic assembly machine using a magnetic mandrel. The ferromagnetic element is preferably a plated copper plate or a plate

magnetic stainless steel.

  In addition, the brushless motor of the present invention further comprises a marking on the upper surface or the side to allow the mounting direction of the motor to be determined. With this marking to allow the engine mounting direction to be determined, the engine can be loaded in the correct direction using an automatic assembly machine. The marking may show a reflectance or a magnetic reaction different from that of the periphery or may exceed or be set back from the periphery. The method is selected according to the structure and size of the motor and the configuration of the ease of assembly of equipment.

  In addition, in accordance with the brushless motor of the present invention, the number of terminals on the bottom surface is greater than the number of poles required for electrical connections. Thus, the lower surface has the large number of terminals including those required for electrical connections, thereby increasing the resistance with which the motor is mounted

  on the substrate to improve impact resistance.

  In many motors, the basic concept is that the bollard has a high mechanical connection function to support a required mass but a separate holding means can be added which includes an elastic body placed between the upper surface and the enclosure of the 'equipment. The terminal can consist of a range of

  connection, plate, wire, or head pin.

  The bottom surface need not be the overall bottom surface, but may consist essentially of the bottom side end surfaces of the side walls. In addition, although a configuration in which an output shaft for obtaining an output does not protrude outward is preferable by protecting the interior, the rotor may partially protrude as

necessary.

  In addition, in accordance with the flat brushless motor of the present invention, the upper surface and the side of the housing approximately surround the overall circumference of the rotor. In this way, the external rotor is further covered by the housing so as to be shielded, so that the interior can be protected from the entry of hot blasts or dust. So this engine is

  suitable for the reflow process.

  In addition, a strip packaging, in accordance with the present invention, comprises a plurality of bumps arranged in series and in which the flat brushless motor is housed. Thus, the motor is delivered from the packaging in the form of a strip, it can be efficiently mounted on the substrate of the equipment like electronic parts in

  using an automatic assembly machine.

  In addition, portable information equipment according to the present invention includes the flat brushless motor of the present invention. As a result, the engine having the above characteristics can be reliably mounted so as to provide high productivity, thereby increasing the value of the equipment. In addition, the flat brushless motor of the present invention has a positioning member projecting from the bottom surface. Since the lower surface has the positioning element for positioning relative to the appropriate equipment, the means

  external drive can be mounted precisely.

  Positioning element is reasonably formed

  coaxially with the bearing device.

  Next, a motor base connector, in accordance with the present invention, is adapted to meet the following requirements: (a) The motor base connector comprises motor bases each using a plate-like material

as the base material.

  (b) The engine base connector includes a plurality of engine bases and a skeleton that remains

  after these engine bases have been punched.

  (c) The plurality of engine bases are repelled and

kept in the skeleton.

  Pores for positioning the skeleton are preferably provided in the skeleton. These structures allow the engine bases to be held by the skeleton, so this engine base connector is suitable for automatic assembly. In addition, by providing a slit near the base of the motor in the skeleton, stress in the skeleton caused by pushing back is reduced to alleviate warping and

the deformation.

  The motor base is a plate having a bottom surface, a stator mounting surface opposite the bottom surface and an outer circumference side, the stator mounting surface having a stator attached thereto. The motor base is desirably a printed circuit board, a ceramic substrate or a metal substrate comprising a plate-shaped insulating material as the base material. In particular, double sided printed circuit boards are more preferable because of their usefulness in reducing

the size and mass of the engine.

  In addition, a brushless motor assembly method in accordance with the present invention is designed to - achieve the following requirements: (a) The motor base connector, the stator, the

  bearing device and rotor are used.

  (b) Each motor base has a stator mounting surface and a bottom surface. The method includes the steps of attaching the bearing device and the stator to the stator mounting surface, assembling the rotor on the bearing device and removing the motor

of the skeleton.

  In this way, the motor base can be manipulated like a connector, so that the position and direction of the motor base can be very precisely regulated and a high quality motor can be quickly assembled using a machine. assembly of the parts. In addition, since no shearing operation is used to remove the motor from the skeleton, there is no possibility of quality degradation driven

  by a shock associated with shear.

  The process may include the steps of heating and curing an adhesive for all engines, performing reflow welding in batches, installing a cover, or performing inspections, or as necessary. In addition, the motor can have either an outer rotor structure with a core or a planar opposite coreless structure, but in the planar opposite coreless type, the motor can act as a magnetic path if the

  engine base includes an iron substrate.

  In addition, a brushless motor according to a seventh embodiment of the present invention is adapted to achieve the following requirements: (a) The motor comprises a stator, a base, a bearing device and a rotor. (b) The stator has a stator core and a coil

  wrapped around the stator core.

  (c) The base is a plate-shaped substrate comprising an electrical insulating material as a base material and having a bottom surface, a stator mounting surface opposite the bottom surface and an outer circumferential side. At least a portion of the outer circumferential side or two or more portions thereon are exposed so as to be held by a skeleton. The bearing device and the stator are fixed coaxially to the stator mounting surface. Pairs of terminals are arranged on the bottom surface or on

the stator mounting surface.

  (d) The rotor has a rotor yoke and a magnet attached to the rotor yoke. The rotor yoke surrounds the periphery of the stator and is supported

  rotating by the bearing device.

  The base is desirably a resin substrate or a printed circuit board. With this base, the external size of the motor can be made as small as the diameter of the rotor by fixing the terminals to the internal surface and the side of the stator by electrically connecting the

  terminals together through the plate material.

  The terminal can be formed of a connection pad, a plate, a wire or a pin with head. In addition, since at least part of the outer circumferential side or two or more parts thereof are exposed so as to be held by the skeleton, a reasonable assembly process can be provided, in which the base of the motor

  is transferred as a connector.

  In addition, in the brushless motor according to the present invention, the base is a double-sided printed circuit board, and a plurality of connection areas are provided on each of the bottom and side surfaces of the stator. This base comprising a double-sided printed circuit board provides heat resistance for welding in the motor assembly, mechanical resistance for holding the motor, and compatibility with a method for transferring the motor while holding its outer circumferential side. By connecting the corresponding connection pads together through the through holes, electrical connections can be made while providing a light and compact motor. In addition, by providing through holes in the outer circumference cutting section, the cover can be inserted into the through holes and fixed at the outer circumferential end of the motor base. This configuration is preferable for providing a cover having approximately the same size as the motor base. Fig. la is a top view of an engine according to the first embodiment of the present invention, FIG. lb is a side view of the engine, FIG. lc is a bottom view of the engine; Fig. 2 is a view in structural section of the engine; Fig. 3a is a top view showing a state in which the motor is mounted on a substrate of an equipment, FIG. 3b is a side view of this state; Fig. 4a is a top view of an engine according to the second embodiment of the present invention, FIG. 4b is a side view of the engine, FIG. 4c is a bottom view of this engine; Fig. 5a is a geometric top view of another oval-shaped motor, FIG. 5b is a similar geometric view, FIG. 5c shows two parallel lines adjacent to the outer circumference of a circle, FIG. 5d represents a square from which a corner has been cut; Fig. 6a is a top view of yet another engine in accordance with the present invention, FIG. 6b is a side view of this engine; Fig. 7a is a top view of yet another engine in accordance with the present invention, FIG. 7b is a side view of this engine; Fig. 8a is a top view of a strip-shaped package in accordance with the present invention, FIG. 8b is a side view of this package; Fig. 9a is a top view of an engine according to the fourth embodiment of the present invention, FIG. 9b is a side view of this engine, FIG. 9c is a bottom view of this engine; Fig. 10 is a view in structural section of the engine; Fig. lla is a top view showing a state in which the motor is mounted on a substrate of an equipment, FIG. llb is a side view of this state; Fig. 12a is a top view of an engine according to the fifth embodiment of the present invention, FIG. 12b is a side view of this engine, FIG. 12c is a bottom view of this engine; Fig. 13a is a top view of yet another engine in accordance with the present invention, FIG. 13b is a side view of the engine; Fig. 14a is a top view showing. a sequence in which engine parts are assembled on a basic engine connector, FIG. 14b is a side view of this sequence; and v _ 1 Vil Fig. 15a is a top view showing a state in which the motors have been assembled on the motor base connector, FIG. 15b is a side view of this state. (Embodiment 1) FIG. la is a top view of an engine according to the first embodiment of the present invention. Fig. lb is a side view of this engine. Fig. This is a bottom view of this engine. Fig. 2 is a view in structural section of the engine. Fig. 3a is a top view showing a state in which the motor is mounted on a substrate of an equipment. Fig. 3b is

a side view of this state.

  In Fig. 1, an engine housing has a flat shape having an upper surface, a side and a lower surface. The housing appears as an octagon as can be seen from the upper surface. A suction surface 5a to which a suction mandrel can be opposed is located approximately at the center of the upper surface. The side is surrounded by eight wall surfaces all around the circumference. In Fig. 2, the motor comprises a stator 1, a printed circuit board 2, a bearing device 3, a rotor 4 and a cover 5. The cover 5 mainly forms the upper surface and the side, and the printed circuit board 2 forms the side part and the

lower surface.

  The stator 1 is formed by covering the surface of a stator core 6 with an insulating film and then by winding a coil 7 around the film. The printed circuit board 2 includes a double-sided substrate. Printed circuit board 2 has a bottom surface, a stator mounting surface opposite the surface

  lower and an outer circumferential side.

  A plurality of connection pads 2a, 2e are located on the lower surface of the printed circuit board 2. FIG. lc represents their shapes as can be seen from the upper surface. A plurality of connection pads 2b are also located on the stator mounting surface. A metal surface

  weldable 2c is formed on the outer circumferential side.

  The metal surface 2c is formed simultaneously with a

- through hole 2d.

  The bearing device 3 and the stator 1 are fixed coaxially to the stator mounting surface of the printed circuit board 2. The coil terminal 7 on the stator core 6 is soldered to the connection pad 2b on the surface of stator mounting. Connection pad 2b is electrically connected to connection pad 2a on

  the lower surface via the through hole 2d.

  The bearing device 3 is configured by a housing with bottom 8, a metal containing oil 9, a thrust receiver 10 and a shaft 11 inserted in the thrust receiver 10, one end of which is fixed to the

rotor center 4.

  The rotor 4 comprises a rotor yoke 12 and a magnet 13 fixed on the rotor yoke 12, and the shaft 11 is fixed in the center of the rotor yoke 12. The rotor yoke 12 surrounds the periphery of the stator 1 and is rotatably supported by the bearing device 3. The rotor 4 further comprises an imbalance means. There are various means for obtaining an imbalance, but this embodiment obtains it by fixing a circular mass 14 to the external circumference of the cylinder head

rotor 12.

  As described above, the cover 5 is approximately in the shape of an octagonal cup having the upper surface, the side and the end situated at the top of the side, and it is a light housing made of a thin metal. The cover 5 covers the rotor 4 and the end abuts against the vicinity of the outer circumferential end of the stator mounting surface of the printed circuit board 2. As shown in FIG. 1b, a protruding part 5b is further formed at the end and is welded and fixed to the opposite metal surface 2c of the

printed circuit board 2.

  The motor configured as described above is - directly mounted on a substrate 101 of an equipment, as shown in FIG. 3. The substrate 101 is a double-sided multilayer substrate on which other electronic parts are integrated and mounted, but these electronic parts are omitted. The motor 100 is welded by reflow to the areas of the substrate of the equipment via the areas of the lower surface (2a, 2e in FIG. 1). The substrate 101 of the equipment comprises a motor drive circuit (IC 102 or another electronic part) which excites and controls the stator 1 via the terminal (range 2a) The motor drive circuit drives the magnet 13 to rotate the rotor 4. Since the rotor 4 has an imbalance means (the circular mass 14), a vibration is transmitted to the equipment as the rotor 4 rotates, thereby allowing information such as a call or alarm to be communicated to a

user as a bodily sense.

  In this way, in the motor of this embodiment, the pairs of terminals (the connection pads 2a, 2e) are arranged on the lower surface so as to be spaced apart by an insulating section. Terminals can be soldered and connected to the equipment substrate by placing and heating them on the substrate, so this motor is suitable for the SMT mounting process

  and can be welded using the reflow process.

  If the terminals on the lower surface are arranged so as not to protrude from the lower lateral zone in order to protrude from the side as shown in fig. 1, the interval between this motor and the adjacent electronic part can be reduced to allow mounting at high density. In addition, the terminals may further protrude perpendicularly from the bottom surface so as to engage with the through holes in the substrate of the equipment, where the terminals may be

  welded to obtain a high fixing force.

  Essentially, however, it is desirable for equipment to obtain sufficient holding force by simply connecting the surface of the motor to the equipment substrate, and the present invention is intended to

meet these requirements.

  The motor of this embodiment also includes the terminal on the lower surface (the connection area 2e) which is not involved with the electrical connections. As shown in fig. lc, eight areas 2a, 2e are formed on the lower surface, but only four (areas 2a) of them are involved with the electrical connections. The large number of pads can increase a coupling surface for the equipment substrate and the motor to allow them to be firmly coupled together. This configuration can improve effective impact resistance when the equipment is dropped inadvertently. In addition, in accordance with the motor of this embodiment, the plurality of connection pads 2a, 2e located on the lower surface are arranged on both sides around a line passing through the centroid of the lower surface. In other words, the areas are arranged symmetrically with respect to the point. In some cases, the centroid of the bottom surface aligns approximately with the center of gravity of the motor, but the force obtained by synthesizing the terminal holding forces may be allowed to align with the center of gravity by arranging the terminals symmetrically about the point. That is, an impact force can be regularly distributed to each terminal to maximize the effective impact resistance when the equipment is inadvertently dropped. Thus, a first point to improve impact resistance is a technique for firmly supporting the motor - using a welded connection structure between the surface

  bottom of the engine and the equipment substrate.

  In addition, the engine of this embodiment is

  approximately entirely surrounded by the enclosure.

  Thus, the interior of the motor can be protected from hot blasts or infrared rays used to melt a weld during a reflow process to prevent the

  internal motor structure to be destroyed by heat.

  As a result, the heat resistance is improved to provide a preferable motor for the reflow soldering process. Since the bottom surface includes a printed circuit board, the motor has high heat resistance, excellent heat insulation capacity and small mass. In addition, the housing provides an easy form of handling, so that the motor can be efficiently mounted on the equipment substrate. In addition, it can prevent the entry of dust, and thus a blockage of the engine caused by dust, in order to maintain the reliability of the engine. In the brushless external rotor motor, the rotor has the function of a cover. There is no brush switch mechanism to protect, and the stator and bearing device are covered by the rotor. Consequently, conventionally, it is not necessary to provide a cover. The present invention provides the external shape and the cover with many functions to create the brushless motor suitable for the process.

  of SMT assembly and the reflow process.

  The motor of this embodiment also comprises the stator core 6 and the coil 7 wound around the stator core 6, and the rotor 4 rotatably surrounds the periphery of the stator 1. That is to say that the

  motor employs the structure with external rotor core.

  This structure offers a magnetic circuit with a higher permeance than the coreless structure, and

  provides for the same output using a smaller magnet.

  It follows that this structure can reduce the mass of the rotor and thus the loads on the bearing device to improve the impact resistance. The reduced mass of the rotor is a second point for improving the impact resistance. In view of this, an opposing planar coreless motor and an external rotor core motor having the same external diameter, and approximately the same characteristics, were experimentally produced and compared in order to find that the mass of the magnet was 1, 5 g and 0.37 g, respectively. In this way, the homogeneous type of external rotor serves to reduce the mass of the rotor. If the mass is reduced by, for example, 0.5 g, the loads on the bearing device can be reduced by 10 kg in an environment of 196,000 m / s2 (20,000 G). Since the bearing device of this motor is very small, the reduction in loads by 10 kg is significant. In addition, the structure with an external rotor core is flat and low. That is to say, this structure has its center of gravity at a low position. As a result, when an impact force is experienced in a direction parallel to the equipment substrate, a smaller moment is given to the terminal connections in a direction in which they are detached. Thus, this structure improves impact resistance by

  compared to a high profile of the same mass.

  ---- - - - __ 1- Wire In addition, the motor of this embodiment does not include a brush switch mechanism. Consequently, it requires no axial space for this mechanism and can be easily made flat and low. It follows that for the same reasons as described above, this structure improves the impact resistance compared to a high profile of the same mass. Naturally, this motor is not subject to deformation or destruction of the brush switch mechanism. As a result, the internal structure can be made more robust and simple in order to improve the impact resistance of the engine. In addition, the functions of the rectifier mechanism are prevented from decreasing, due to a welding or flux atmosphere, so that this motor is preferable.

  for the reflow soldering process.

  As described above, high impact resistance is achieved by using many techniques such as the technique for firmly supporting the motor using the welded structure between the lower surface of the motor and the equipment substrate, the light rotor, the low profile, the light housing (cover and

  printed circuit board) and simple structure.

  In addition, in the motor of this embodiment, the suction surface 5a to which a suction mandrel (a pneumatic mandrel) can be opposed is provided approximately at the center of the upper surface. According to this embodiment, the suctioned surface is a circular flat surface with a diameter of approximately 6 mm. This surface can be used

  for vacuuming and mandrel mounting the upper surface.

  Since the pneumatic chuck is a chuck mounting method that prevents interference with the adjacent electronics, the gap between the motor and the adjacent electronics can be reduced. It follows -X - that the motor can be mounted efficiently so as to

achieve high density.

  In order to control the rotor for rotations, a hole can be formed at the center of the upper surface to expose the shaft, but even in this case, a ring-shaped suction surface easily allows for pneumatic chucking. In addition, the pneumatic mandrel is flexible, so that it can also mount a mandrel

  vacuumed surface which is not necessarily flat.

  In addition, in the engine of this embodiment, the side includes two parallel planes 5c extending approximately perpendicular to the bottom surface. If the planes 5c reach the upper surface, a part of the side located near the upper surface of the motor can be taken for loading so as to eliminate the need to mount the vicinity of the lower surface in a chuck, thereby preventing the chuck from taken to interfere with the adjacent electronic part. Consequently, the interval between the motor and the adjacent electronic part can be reduced to allow the motor to be mounted efficiently so as to reach a high density. In addition, this linear part of the motor contour allows alignment without interference from the gripping chuck. In this way, alignment is facilitated and can be easily controlled to improve accuracy in the mounting position and direction. Thus, the motor can be mounted on the substrate of the equipment so as to reach a

high density.

  In addition, the engine of this embodiment appears as an octagon as can be seen from the top surface. This shape is similar to the circular shape of the rotor and occupies a smaller area than the equipment substrate. It also allows easy grip and alignment. Thus, the motor can be X r! Does it mounted on the equipment substrate so as to reach

high density.

  In addition, in the engine of this embodiment, the material of the upper surface (i.e., the cover 5) is preferably a ferromagnetic substance (such as a square of steel). Such an upper surface can receive a magnetic mandrel and allows the use of the mandrel means which replaces the pneumatic and gripping mandrels. This upper surface is also convenient for the formation of a marking which uses magnetic reactions. The marking must

  only have a different shape from the periphery.

  In addition, in the motor of this embodiment, a marking 15 which allows the mounting direction to be determined is provided on the upper surface or on the side. This configuration allows the mounting direction to be controlled for automatic loading. Even if the engine is packed or delivered in the wrong direction, the marking allows the direction in which the engine is mounted to be determined. Thus, the motor can be mounted on the substrate of the equipment so as to reach a high density. The marking according to this embodiment is a black punching which shows a reflectance different from that of the

periphery.

  The marking can be in relief or in hollow relative to the periphery. Advantages of such marking are that it can be formed simultaneously with the element forming the upper surface or the side (in this embodiment, the cover), using a mold to produce this element which it can receive. all control

  visual, a magnetic reaction and a height sensor.

  This marking can be a process showing a magnetic reaction different from that of the periphery, by

example, magnetic ink.

  This motor has such an efficient loading mandrel to allow precise alignment and mounting without directional error. These functions provided for housing allow the motor to be efficiently mounted on the substrate of the equipment like other massive electronic parts and to be placed close to them.

  so as to achieve a high density.

  (Embodiment 2) FIG. 4a is a top view of another engine according to the present invention. Fig. 4b is a side view of this engine. Fig. 4c is a view of

below this engine.

  As shown in the figures, the motor of this embodiment has protruding terminals 25d, protruding outward from the side. The protruding terminals 25d are formed by further elongating the protruding part of the cover 25. As shown in FIG. 4c, the eight connection pads 22a, 22e are located on the lower surface and the protruding terminals 25d are added to these pads. As is apparent from FIG. 4b, the protruding terminals 25b are approximately at the same level as the connection pads 22a, 22e. When placed on the

  equipment substrate and reflow welded thereon

  ci, the motor is fixed by means of a large number of

  terminals to obtain a higher holding resistance.

  In addition, although not shown, a structure can be used in which the protruding terminals alone can together provide a mechanical junction function and an electrical connection function. The protruding terminals can be connected with the equipment substrate using the reflow process by selectively heating only the terminals without heating the motor body. This process can reduce an increase in temperature inside the engine to allow r - ITT to allow reflow soldering without destroying the engine despite the presence of a low engine component.

heat resistance.

  (Variant of Embodiments 1 and 2) This section shows a variant of the planar shape. Fig. 5a is a top view of yet another engine which appears similar to an oval, as can be seen from the top view. Fig. 5b shows a shape similar to that of FIG. 5a. Fig. 5c shows a shape in which two parallel lines are located adjacent to the outer circumference of a circle. Fig. d shows a square with one corner cut. The similar shape in FIG. 5b is obtained by cutting a circle

  using two parallel lines.

  An oval or similar shape is similar to a circle, in such a way that a motor is characterized in that it can save space and be engaged and in that it has internal space and is preferred in the case of additional incorporation of electronic part inside the engine. The shape in FIG. 5c is very similar to a circle and saves space, thereby reducing an area of the substrate of the embodiment which is occupied by the motor. The shape in FIG. 5d can also be used as a marking for

determine the direction.

  Fig. 6a is a top view of yet another engine in accordance with the present invention. Fig. 6b is a side view of this engine. Fig. 7a is a top view of yet another engine in accordance with the present invention. Fig. 7b is a side view of this engine. The motor of FIG. 6 is formed by placing a cylindrical cover 45 on an octagonal printed circuit board 42. Since only the vicinity of the bottom surface includes the planar portion on the motor side, the top surface side is difficult to take. Even in this case, however, a pneumatic chuck can be used to chuck the upper surface for transferring the motor, and the position or direction can be corrected during the transfer. This structure is advantageous in that the cover 45 requires only

low costs.

  The "parallel edges located on the side and extending parallel to the lower surface" set out

  in the claims are, for example, edges 42f

* located in Fig. 6. These edges can be 42g. Alignment can be achieved by gripping and pressing these edges using a gripping chuck. In this case, however, the bottom or top surface must be

supported.

  The motor in Fig. 7 is formed by placing an arcuate cover 65 on an octagonal printed circuit board 62. This structure cannot protect the interior of the engine from heat but reduces mass and costs while saving resources. It can also reduce

  the occupied surface of the printed circuit board 62.

  (Embodiment 3) FIG. 8a is a top view of a strip-shaped package according to the present invention. The

  Fig. 8b is a side view of this package.

  As shown in the figures, a large number of bumps 111 are arranged in series in a strip-shaped package 110, with a flat vibrating motor 120 housed in each of the bumps. After housing, the bumps are covered with a film (not shown in the drawings). The packaging 110 also includes holes 112 (drive holes) whose sizes conform to the industrial standard. The package 110 is wound around a reel for feeding. In order to mount the motors on the equipment substrate, the motors are

  sequentially loaded using the coil.

  With this form of packaging suitable for automatic feeding, these motors can be efficiently mounted on the equipment substrate using an automatic machine. As described above, the present invention has clarified the conventional brushless motor and modified the external shape, the internal structure and even the feed form so that the motor can be manipulated like other parts.

massive electronics.

  (Embodiment 4) FIG. 9a is a top view of an engine according to the fourth embodiment of the present invention. Fig. 9b is a side view of this engine. Fig. 9c is a bottom view of this engine. The

  Fig. 10 is a view in structural section of this engine.

  Fig. This is a top view showing a state in which the engine is mounted on an equipment substrate. Fig.

  11b is a side view of this state.

  In Fig. 9, a housing of an engine has a flat shape having an upper surface, a side and a lower surface. The accommodation appears as an octagon,

  as we can see from the top surface.

  A suction surface 5a to which a suction mandrel can be opposed is located approximately at the center of the upper surface. The side is surrounded by

  eight wall surfaces all around the circumference.

  In Fig. 10, the motor comprises a stator 1, a printed circuit board 2, a bearing device 3, a rotor 4 and a cover 5. The cover 5 mainly forms the upper surface and the side and the printed circuit board 2 forms a side part and bottom surface. v - I iiil Although the vibrating motor of embodiment 1 fixes a circular mass 14 to the outer circumference of the rotor yoke 12 as a means to achieve imbalance, the flat brushless motor of embodiment 4 does not include the mass 14 since it is not desired. Another important difference is that a shaft 11a is structured so that a part of it protrudes from the upper surface of the cover in order to exit a rotational driving force outside the motor and this part of a housing 8 protrudes from the

  lower surface as a positioning element 8a.

  This equipment has an infrared sensor function and the motor is used as a chopper for the infrared rays arriving on the sensor. External drive means (a protruding part 11a of the shaft) protrudes from the upper surface to rotate an obscuring disc 103 attached to the external drive means at a specified rotational speed. An infrared ray receiving element 104 is located behind the darkening disc 103 and the light incident on the infrared ray receiving element 104 is

driven by the motor 105.

  In addition, since the pneumatic mandrel is flexible, it can also suck on a surface which is not necessarily flat. This embodiment has a surface which can be vacuumed, in the outer circumference of a vacuumed surface 5a, and this surface can be vacuumed. Even in this case, a suction surface in the shape of a ring easily allows the chuck

pneumatic.

  (Embodiment 5) FIG. 12a is a top view of an engine according to the present invention. Fig. 12b is a side view of this engine. Fig. 12c is a view of

below this engine.

  - 111! I As shown in the figures, the motor of this embodiment has protruding terminals d protruding outward from the side, relative to the motor in embodiment 4. The protruding terminals 25d are formed by further extending the projecting part of the cover 25. As shown in FIG. 12c, the eight connection pads 22a, 22e are placed on the lower surface and protruding terminals 25d are added to these pads. As is apparent from FIG. 12b, the protruding terminals 25b are approximately at the same level as the pads 22a, 22e. When placed on the equipment substrate and welded by reflow on it, the motor is fixed by means of the large number of terminals for

  obtain a higher holding resistance.

  (Embodiment 6) FIG. 13a is a top view of yet another engine in accordance with the present invention. Fig. 13b

is a side view of this engine.

  The motor in Fig. 13 is formed by placing an arch-shaped cover 65 on an octagonal printed circuit board 62. Likewise, this structure cannot protect the interior of the engine from heat but reduces mass and costs while saving costs. resources. It can also reduce a printed circuit board surface 62 which is occupied by the motor. Since the rotor is partially exposed, the exposed part can be

  used to frictionally drive equipment.

  The "two parallel edges located on the side and extending parallel to the lower surface" stated

  in the claims are, for example, edges 42f

  located in Fig. 13. These edges can be 42g. Alignment can be achieved by gripping and pressing these edges using a gripping chuck. In this case, however, the lower or upper surface must be supported. In this way, since the motor of the present invention can be surface mounted on the substrate and has other excellent characteristics such as very small size and weight and high impact resistance, this motor can be used for different

  applications that take advantage of these features.

  Applications may include portable information equipment, portable games equipment, head-up projection system and fans

  to locally cool the equipment substrate.

  (Embodiment 7) FIG. 14a is a top view showing a sequence in which the engine parts are assembled on a base engine connector. Fig. 14b is a side view of this sequence. Fig. 15a is a top view showing a state in which the motors have been assembled on the motor base connector. Fig.

  15b is a side view of this state.

  In this embodiment, taking the same motors as those described in embodiment 1 (Figs. 1 and 2) by way of example, a method for assembling

  these motors will be described with reference to Figs. 14 and 15.

  These motors are characterized in that they are assembled using a basic motor connector. In Fig. 14, a motor base connector 20 includes 15

  bases 2 (printed circuit board 2) and their skeleton 21.

  This structure is obtained by cutting the bases 2 in a cutting process and repelling them, as is

  shown at the right end of FIG. 14b.

  This process is mainly used to transfer a metal part to and from a press mold. The skeleton is a cut residue that remains after the

  punching the metal part.

  Each of the bases 2 of the motor base connector 20 produced in this way includes an upper surface acting as a stator mounting surface; and a lower surface opposite the upper surface. An adhesive and a solder cream are previously applied to the stator mounting surface to install a stator assembly 16 and a bearing device on this surface. The rotor 4 is then inserted into

  assembly, and cover 5 is installed.

  Subsequently, a process of welding by heat reflow in batches is implemented to simultaneously complete the adhesion between the base 2 and the assembly 16 of the stator and of the bearing device, the welded connection between the terminal of the coil 7 and the pad 2b, and the welded attachment between the cover 5 and the metal surface 2c on the outer circumferential surface of

base 2.

  During this process, the end of the side of the cover 5 abuts the circumferential end of the base and the protruding part 5b is inserted into an oval through hole 23 at the border between the base 2 and the skeleton 21. The part protruding 5b is fixed by welding to the metal surface 2c which has been formed in the hole

through oval 23.

  Once the motors have been assembled as shown in fig. 15, a probe is applied to areas 2a on the lower surface of each engine for inspections. Acceptable products are marked 15 and are individually removed, as shown at the right end of FIG.

  b, followed by packaging for shipment.

  Alternatively, the motors can be shipped without being removed. In this case, since the motors are delivered aligned, they can be conveniently mounted on the equipment using an automatic assembly machine. As described above, the motor of this embodiment is assembled using the base motor connector 20 to place each part thereon. This process precisely positions and maintains the base of motor 2 to eliminate the need for alignment, inversion, rearrangement and basic paddles, thereby improving productivity. In addition, no shear is

  used to remove the completed motor from the skeleton 21.

  Thus, no impact associated with shearing occurs,

  thereby preventing the quality of the engine from being degraded.

  In addition, this motor has excellent characteristics in that it is not limited in external diametral shape and in that it is suitable for reduction in size since its external shape can be formed with a

mold precision.

  In addition, since the motor of this embodiment uses the motor base connector 20, the skeleton 21 maintains the bases 2 to eliminate the need for additional materials such as bridges. As a result, base costs can be reduced. In addition, thanks to the absence of the need to cut bridges, no space is required for a cutting edge, thereby avoiding the distortion caused by the stress resulting from cutting. It follows that the base can be used fully to arrange the parts. Alternatively, the required area can be minimized to reduce the size and mass of the engine. Thanks to the absence of constraints on connections such as the use of bridges, the base can be formed arbitrarily. In addition, since the external shape can be formed with the precision of the mold, this motor can be produced precisely and is suitable for

a reduction in size.

  In addition, the base 2 of the motor of this embodiment comprises a double-sided printed circuit board. The plurality of pads are located on each of the bottom surface and the stator side so that the mutually corresponding pads are connected via the through holes. As a result, no other electrical connection element is required, thereby allowing the stator to be compactly connected to an external connection terminal and to reduce the size and mass of the motor. In addition, the double-sided printed circuit board is suitable for the present process because of its high heat resistance to welding and mechanical strength, because its external circumferential side can be maintained and because it is subjected with little warping thanks to its symmetry in the direction of the thickness. Thus, this invention can provide engines of quality and

high productivity.

  In this way, the motor of the present invention does not use the substrate as a simple element of electrical wiring but as a main structure (base) for the motor in order to reduce the number of elements required and the mass. In addition, the base includes a plate-shaped substrate using electrical insulating material as the base material. The use of the electrical insulating material allows the use of a structure comprising motor components on one surface of the substrate and external connection terminals on the other surface, thereby allowing the required functions to be arranged in a manner compact. The resistance of this substrate is weaker than that of a metallic substrate and is compensated by the reduction in masses and sizes of

all parties.

  In addition, since the motor is structured to expose the outer circumferential side of the base, it can be held continuously in the connector until it is completed. In addition, the substrate is maintained using a die cutting process, which is most suitable for reducing the size of the substrate while increasing the accuracy. In accordance with this structure, the motor is assembled using the connected substrate intended for the above use and by placing

  sequentially parts on a surface of the substrate.

  In addition, the fixing and joining of all parts is

  simply completed by heating the assembly by reflow.

  In this way, the flat brushless motor having reduced size and mass and improved productivity

has been completed.

  It is apparent from the above description,

  that the flat brushless motor is suitable for the SMT process and is preferred for the reflow welding process for the following reasons: (a) The terminals are structured so as to be connected by welding to the substrate of the equipment by placing and in

  heating the engine on the substrate.

  (b) The internal motor structure is not destroyed by

  infrared heat and the heat of hot air blasts.

  (c) The quality of the motor is not degraded by welding or the flux atmosphere. In addition, the motor can be efficiently mounted on the equipment substrate for the following reasons:

  (d) It has an easy to handle shape.

  (e) It can be transferred using a mandrel.

  (f) Its direction can be determined when the engine is

mounted.

  (g) The shape of the package is suitable for automatic feeding. In addition, the motor can be mounted on the structure of the equipment in order to reach a high density for the following reasons: (h) It serves to reduce an area of the substrate of the equipment

which is occupied by itself.

  (i) It serves to reduce the interval between itself and the adjacent electronic part. In addition, the motor can be provided with high impact resistance for the following reasons: (j) It can be firmly coupled to the equipment substrate. - (k) An impact force can be regularly supported by

each terminal.

  (1) The internal structure can be simplified.

  (m) The mass of the rotor can be reduced.

  (n) The height of the motor should be reduced.

  In addition, the present invention uses the skeleton to hold the base of the motor for assembly, thereby eliminating the need for additional space to shear as in the bridge process to allow size and mass to be reduced . In addition, there is no impact associated with shearing and separation of the finished products, so that a high quality

can be maintained.

  In addition, since the base of this motor includes an insulating plate, the motor is light, small and compact. It also features improved productivity as it

  can be maintained and assembled as described above.

  As a result, portable information equipment including the flat brushless motor, in accordance with the present invention, has reduced size and mass, improved productivity and values

  improved additions, compared to the prior art.

_- _--; -vil--

Claims (10)

  1. A brushless motor comprising: a housing comprising a lower surface (2), a lateral surface and an upper surface, said lower surface (2) being located adjacent and opposite to a substrate (101) of an equipment; and pairs of terminals (2a, 2e, 22a, 22e) on the external side of said lower surface which can be mechanically or electrically connected to said equipment substrate, each of said pairs of terminals being arranged on both sides by relative to a line traversing the centroid or center of gravity of the lower surface, in which a stator (1), a bearing device (3) and a rotor (4) are provided inside said housing, said stator (1 ) comprising a stator core (6) and a coil (7) wound around the stator core (6), said rotor (4) comprising a magnet (13) and being supported by said bearing device (3) so as to surround with rotating the periphery of said stator (1), said   rotor (4) further including an imbalance means (14).   2. A brushless motor comprising: a housing comprising a lower surface (2), a lateral surface and an upper surface, said lower surface (2) being located adjacent and opposite to a substrate (101) of an equipment; and pairs of terminals (25d) which project outwards from said lateral surface at approximately the same height as the lower surface and which can be mechanically or electrically connected to said substrate of the equipment, each of said pairs of terminals being arranged on both sides with respect to a line -. I lii passing through the centroid or center of gravity of the lower surface, in which a stator (1), a bearing device (3) and a rotor (4) are provided inside said housing, said stator (1) comprising a stator core (6) and a coil (7) wound around the stator core (6), said rotor (4) comprising a magnet (13) and being supported by said bearing device (3) so as to surround so rotating the periphery of said stator (1), said   rotor (4) further including an imbalance means (14).   3. A brushless motor comprising: a housing comprising a lower surface (2), a lateral surface and an upper surface, said housing including a mandrel section, the external side of said lower surface (2) being located adjacent and opposite to a equipment substrate (101); and pairs of terminals (2a, 2e, 22a, 22b, 25d) on the outer side of said bottom surface or said side surface which can be mechanically or electrically connected to said equipment substrate, each of said pairs of terminals being arranged on both sides with respect to a line passing through the centroid or center of gravity of the lower surface, in which a stator (1), a bearing device (3) and a rotor (4) are provided inside said housing, said stator (1) comprising a stator core (6) and a coil (7) wound around the stator core (6), said rotor (4) comprising a magnet (13) and being supported by said bearing device (3 ) so as to rotate around the periphery of said stator (1), said   rotor (4) further including an imbalance means (14).   4. A brushless motor according to claim 3, wherein the mandrel section comprises a suction surface (5a) which is located on the upper surface and to which   a suction mandrel can be opposite.   5. A brushless motor according to claim 3, in which the mandrel section comprises two parallel planes (5c) located on the lateral surface and extending approximately perpendicular to the lower surface (2) or two parallel edges (42f, 42g) located on the side and extending parallel to the bottom surface (2).   6. A brushless motor according to claim 3, wherein the mandrel section comprises an element   ferromagnetic forming the upper surface.   7. Brushless motor according to claim 3, further comprising on the upper or lateral surface, a marking (15) to allow the bridging direction of the motor. be determined.   8. Brushless motor according to any one of   claims 1 to 3, in which the number of terminals (2a,   2e, 22a, 22e) on the lower surface is more important than the number of poles (2a, 22a) required for connections electric.   9. Flat brushless motor according to any one of   claims 1 to 3, wherein the upper surfaces   and side of the housing approximately surround the   entire circumference of the rotor (4).   10. Portable information equipment including a   brushless motor according to any one of claims 1 to 3.