JP2006094644A - Brushless motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brushless motor for improving and ensuring a securement to a mounting board. <P>SOLUTION: In the brushless motor 1, a soldering flat plane 5 is formed in a cover 4 for constituting a portion of an exterior housing 2 for accommodating a stator 9 and a rotor 18. One end 21a of a power supply terminal 21 is electrically connected to a circuit board 7. The other end 21b of the power supply terminal 21 is located in the same plane as the flat plane 5 outside the exterior housing 2. When the other end 21b of the power supply terminal 21 is soldered to the mounting board of a cellular phone, the flat plane 5 of the cover 4 is also soldered to the mounting board. Accordingly, the area of a section soldered to the mounting board can be increased in the brushless motor 1, and the securement of the brushless motor 1 can be improved to the mounting board. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a brushless motor used by being incorporated in, for example, a mobile phone.

Some conventional brushless motors include a terminal that is fixed to a base member that supports a stator and a rotor, and the other part that protrudes to the side of the base member (see, for example, Patent Document 1). Such a brushless motor is fixed on the mounting substrate by soldering other portions of the terminals on the mounting substrate of a mobile phone or the like. Also, a structure for reflow soldering that can be identified from the outside has been proposed separately (for example, see Patent Document 2).
JP 2003-180064 A JP 2000-189893 A

  However, in the brushless motor as described above, since the other part of the terminal to be soldered protrudes to the side of the base member, the visibility of the soldered state at the terminal is improved, but the mounting substrate There is room for improvement in terms of ensuring fixation.

  Therefore, the present invention has been made in view of such circumstances, and an object thereof is to provide a brushless motor capable of improving the certainty of fixing to a mounting board.

  In order to achieve the above object, a brushless motor according to the present invention is a brushless motor comprising a stator having a coil and a rotor having a magnet, and a circuit in which an outer housing for housing the stator and the rotor and the coil are arranged. And a power supply terminal having one end electrically connected to the circuit board. The outer housing has a flat surface for soldering, and the other end of the power supply terminal is a flat surface outside the outer housing. It is characterized by being located on substantially the same plane.

  In this brushless motor, a flat surface for soldering is formed on the outer housing that houses the stator and the rotor, and the other end of the power supply terminal, one end of which is electrically connected to the circuit board, is outside the outer housing. It is located on the same plane as the flat surface. Accordingly, when the other end of the power supply terminal is soldered onto a mounting board such as a mobile phone, the flat surface of the exterior housing can be soldered onto the mounting board. Accordingly, it is possible to increase the area of the portion soldered on the mounting board in the brushless motor, and it is possible to improve the certainty of fixing the brushless motor to the mounting board.

  The exterior housing has a base member that supports the stator and the rotor and a cover that covers the stator and the rotor, and the flat surface is preferably formed on the cover. Since the cover is generally made of metal, the flat surface of the cover can be soldered onto the mounting substrate using a general-purpose cover without adopting any special configuration for the cover.

  Further, the power supply terminal is preferably formed of a metal fitting. By using the power supply terminal as a metal fitting in this way, it is possible to easily form a power supply terminal having one end electrically connected to the circuit board and the other end positioned substantially on the same plane as the flat surface of the exterior housing. .

  Moreover, it is preferable that the weight is attached to the rotor. Thereby, a brushless motor can be used as a vibration generation source.

  According to the brushless motor according to the present invention, it is possible to improve the reliability of fixing to the mounting substrate.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of a brushless motor according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the brushless motor 1 is configured as an axial gap structure, and is incorporated in a mobile phone or the like and used as a vibration generation source. The brushless motor 1 includes a columnar outer housing 2 formed in a size of, for example, a diameter of 9.5 mm × a height of 3.0 mm. The exterior housing 2 is composed of a base member 3 formed in a plate shape with resin and a cover 4 formed in a cap shape with a metal having good solderability. A flat surface 5 is formed on the outer surface of the top plate portion of the cover 4.

  In the exterior housing 2, a press-fit recess 3 a is formed in the central portion of the base member 3, and a press-fit recess 4 a is formed in a portion of the cover 4 that faces the press-fit recess 3 a. In the press-fitting recesses 3a and 4a, both end portions of the shaft 6 are press-fitted and fixed.

  Further, in the outer housing 2, a flux plate 10 and a circuit board 7 that covers the flux plate 10 are fixed to the base member 3. The circuit board 7 has a protruding portion 7 a that protrudes outside the outer housing 2 through an opening 2 a formed in the outer housing 2.

  As shown in FIG. 2, two coils 8 facing each other with the shaft 6 interposed therebetween are mounted on the circuit board 7. These two coils 8 are connected in series to form a single-phase stator 9. Further, electronic components such as a Hall element 11 that detects magnetism and a motor drive IC 12 that supplies current to the coil 8 are mounted on the circuit board 7.

  As shown in FIG. 1, the above-described shaft 6 is fitted with a sleeve metal 14 that is press-fitted and fixed to a central portion of a disk-shaped rotor yoke 13. Further, a washer 16 is fitted in a portion of the shaft 6 between the base member 3 and the sleeve metal 14. Thereby, the rotor yoke 13 is rotatably supported by the shaft 6.

  A ring-shaped magnet 17 is fixed to the rotor yoke 13 so as to face the coil 8 in the direction of the rotation axis L, and a rotor 18 is constituted by the rotor yoke 13 and the magnet 17. Further, a weight 19 is fixed to a part of the rotor yoke 13. Thereby, since the weight distribution of the rotor 18 with respect to the rotation axis L becomes uneven, the brushless motor 1 can be used as a vibration generation source.

  Further, as shown in FIGS. 1 and 3, a pair of feeding terminals 21 made of a metal having good solder wettability are disposed on the protruding portion 7a of the circuit board 7 as an anode and a cathode. Each power supply terminal 21 is formed by a metal fitting bent in a U-shape, and is disposed in a groove 22 a of an upright portion 22 that stands integrally with the base member 3 outside the exterior housing 2.

  One end 21a of each power supply terminal 21 is electrically connected to the circuit board 7 by being soldered to a power supply land formed on the protruding portion 7a. On the other hand, the other end 21 b of each power supply terminal 21 is located substantially on the same plane as the flat surface 5 of the cover 4 outside the exterior housing 2.

  In the brushless motor 1 configured as described above, the other end 21b of each power supply terminal 21 is located on substantially the same plane as the flat surface 5 of the cover 4, and therefore, as shown in FIG. The flat surface 5 can be used as a soldering pad. Therefore, as shown in FIG. 5, the power supply terminal land 31 and the flat surface are made to correspond to the other end 21 b and the flat surface 5 by plating or coating solder on the mounting substrate 30 of a mobile phone or the like in advance. If the land 32 is formed, the other end 21b of the power supply terminal 21 is reflow-soldered to the power supply terminal land 31 on the mounting substrate 30 as shown in FIG. The flat surface 5 of the cover 4 can be reflow soldered to the land 32 for use.

  As described above, according to the brushless motor 1, it is possible to increase the area of a portion soldered onto the mounting substrate 30 in the brushless motor 1 while suppressing the mounting area of the brushless motor 1 with respect to the mounting substrate 30. Thereby, for example, it is possible to improve the certainty of fixing the brushless motor 1 to the mounting substrate 30 such as an improvement in peel strength of the brushless motor 1 due to a drop impact.

  In the brushless motor 1, the flat surface 5 for soldering is formed on the cover 4, but since the cover 4 is generally formed of metal, a special configuration is adopted for the cover 4. The flat surface 5 of the cover 4 can be soldered onto the mounting substrate 30 using the general-purpose cover 4 without any problem.

  Further, by using the power supply terminal 21 as a metal fitting, the power supply terminal 21 whose one end 21 a is electrically connected to the circuit board 7 and whose other end 21 b is located on the substantially same plane as the flat surface 5 of the cover 4 can be easily provided. Can be formed.

  The present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, the flat surface 5 for soldering is formed on the cover 4 constituting a part of the outer housing 2, but the flat surface 5 for soldering is formed on other portions of the outer housing 2. May be. As an example, as shown in FIG. 7, the flat surface 5 for soldering may be formed by forming a metal film 23 on the outer surface of the base member 3 with a metal having good solder wettability. The power supply terminal 21 may be extended from the circuit board 7 toward the base member 3, and the other end 21 b may be positioned substantially on the same plane as the flat surface 5.

  Moreover, in the said embodiment, although the brushless motor 1 was comprised as an axial gap structure, the brushless motor which concerns on this invention may be comprised as a radial gap structure.

1 is a longitudinal sectional view of an embodiment of a brushless motor according to the present invention. It is a top view inside the brushless motor shown by FIG. It is a left view of the brushless motor shown by FIG. It is a top view of the brushless motor shown by FIG. It is a top view of mounting substrates, such as a mobile phone. It is a figure which shows the state by which the brushless motor shown by FIG. 1 was fixed on mounting boards, such as a mobile telephone. It is a longitudinal cross-sectional view of the brushless motor as a modification.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Brushless motor, 2 ... Exterior housing, 3 ... Base member, 4 ... Cover, 5 ... Flat surface, 7 ... Circuit board, 8 ... Coil, 9 ... Stator, 17 ... Magnet, 18 ... Rotor, 19 ... Weight, 21 ... Feeding terminal, 21a ... one end, 21b ... the other end.

Claims (4)

In a brushless motor comprising a stator having a coil and a rotor having a magnet,
An exterior housing that houses the stator and the rotor;
A circuit board on which the coil is disposed;
A power supply terminal having one end electrically connected to the circuit board;
The outer housing has a flat surface for soldering,
The brushless motor is characterized in that the other end of the power supply terminal is positioned substantially on the same plane as the flat surface outside the exterior housing. The exterior housing includes a base member that supports the stator and the rotor, and a cover that covers the stator and the rotor,
The brushless motor according to claim 1, wherein the flat surface is formed on the cover.   The brushless motor according to claim 1, wherein the power supply terminal is formed of a metal fitting.   The brushless motor according to claim 1, wherein a weight is attached to the rotor.

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