JP2015095945A - Brushless motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brushless motor in which the reliability of a solder joint can be enhanced when a strip cable way member is twisted or stretched.SOLUTION: In a brushless motor including a stator 30 having a coil 33, a rotor 40 having a magnet 43, a mounting plate 10A for holding the stator 30 on the upper surface, a strip cable way member 60, and a circuit board 50A, the circuit board 50A is fixed to the mounting plate 10A, and one end side of the cable way member 60 is fixed between the mounting plate 10A and circuit board 50A in an unbent state.

Description

  The present invention relates to a brushless motor connected to an external circuit via a strip-shaped electric circuit member such as FFC or FPC.

  An outer rotor type brushless motor is used as a spindle motor that rotationally drives a color wheel of a projector device, a polygon mirror of a printer device, and the like. In such a brushless motor, in order to electrically connect to an external circuit, a plurality of land portions are concentrated on one place of a circuit board such as a PCB, and an FFC (flexible flat cable) or FPC (flexible printed circuit board). ) Or the like is connected to the land portion and an external circuit.

  Specifically, on the brushless motor side, the lead wire of the stator coil is soldered to the circuit board, and a plurality of land portions provided on the surface of the circuit board, and the terminal portions of the belt-shaped electric circuit member are provided. They are fixed by soldering and are electrically connected.

  However, simply soldering the terminal portion of the belt-like electric circuit member to the land portion of the circuit board will cause the motor circuit to vibrate, or if the electric circuit member is pulled or twisted, If a force is applied in the direction of separating the part, disconnection may occur.

  Therefore, in Patent Document 1, the circuit board is provided with a protruding portion that locks the belt-shaped electric circuit member, thereby preventing the belt-shaped electric circuit member from being lifted and preventing a large force from being directly applied to the soldering portion. Yes.

  Further, in Patent Document 2, a belt-shaped electric circuit member is sandwiched and fixed between a motor base and a circuit board, and the electric circuit member is bent into a U-shape from the front end of the circuit board to the back side, By soldering to the part, it is possible to prevent a large force from being directly applied to the soldered part.

JP 2002-119004 A JP-A-6-251497 (paragraphs [0021], [0022])

However, in the configuration described in Patent Document 1, since the locking projection is provided on the circuit board, the circuit board is likely to be larger than necessary, and cannot be applied to a device having no installation space. . Further, in the configuration described in Patent Document 1, although it functions relatively effectively with respect to the twisting of the belt-like electric circuit member, it cannot function sufficiently with respect to the tension, and the soldering portion still remains. Disconnection is a concern.
Further, in the configuration described in Patent Document 2, since the FPC is completely bent by 180 degrees and used, there is a problem that the bent portion is likely to be disconnected.

  Accordingly, an object of the present invention is to provide a brushless motor that can improve the reliability of the solder connection portion when twisting or pulling occurs in the belt-like electric circuit member while solving the above-described problems.

  To achieve the above object, a brushless motor according to an aspect of the present invention includes a stator having a coil, a rotor having a magnet facing the outer periphery of the stator, a mounting plate for holding the stator on an upper surface, A strip-shaped electric circuit member having a plurality of connection terminals at both ends, a first land part to which the terminal of the coil is solder-connected, and a second land part to which the plurality of connection terminals at one end of the electric circuit member are solder-connected The circuit board is fixed to the mounting plate, and the one end side of the electric circuit member is sandwiched and fixed between the mounting plate and the circuit board in an unfolded state.

  According to the brushless motor of the present invention, one end of the belt-like electric circuit member is sandwiched between the mounting plate and the circuit board, and the electric circuit member is fixed from both sides in a non-bent state. It is possible to effectively suppress the direct application of a large force to the solder connection portion even when the electric circuit member is twisted or pulled without making the mounting plate larger than necessary and without causing the electric circuit member to be disconnected. This can improve the reliability of the solder connection portion.

FIG. 1 is a side view showing a brushless motor according to a first embodiment of the present invention in a partial cross section. FIG. 2 is a plan view for explaining an assembly structure of the mounting plate 10A, the circuit board 50A, and the electric circuit member 60 in the brushless motor of FIG. 3A and 3B show a mounting plate 10A in the brushless motor of FIG. 1, wherein FIG. 3A is a plan view, FIG. 3B is a sectional view taken along line AA in FIG. It is an arrow view in the -B line. FIG. 4 is a side view showing a brushless motor according to a second embodiment of the present invention in a partial cross section. FIG. 5 is a plan view for explaining an assembly structure of the mounting plate 10B, the circuit board 50B, and the electric circuit member 60 in the brushless motor of FIG. 6 shows the mounting plate 10B in the brushless motor of FIG. 4, where (a) is a plan view, (b) is a cross-sectional view taken along line CC of (a), and (c) is D of (a). It is an arrow view in the -D line. FIG. 7 is a side view showing a brushless motor according to a third embodiment of the present invention in a partial cross section. FIG. 8 is a plan view for explaining an assembly structure of the mounting plate 10C, the circuit board 50C, and the electric circuit member 60 in the brushless motor of FIG. 9 shows a mounting plate 10C in the brushless motor of FIG. 7, wherein (a) is a plan view, (b) is a sectional view taken along line EE of (a), and (c) is F of (a). It is an arrow view in the -F line. FIG. 10 is a side view showing a brushless motor according to a fourth embodiment of the present invention in partial cross section. FIG. 11 is a plan view for explaining an assembly structure of the mounting plate 10D, the circuit board 50D, and the electric circuit member 60 in the brushless motor of FIG. 12 shows a mounting plate 10D in the brushless motor of FIG. 10, (a) is a plan view, (b) is a sectional view taken along line GG of (a), and (c) is H of (a). It is an arrow view in the -H line. FIG. 13: is a side view which shows the brushless motor which concerns on the example of 5th Embodiment of this invention in a partial cross section. FIG. 14 is a plan view for explaining an assembly structure of the mounting plate 10E, the circuit board 50E, and the electric circuit member 60 in the brushless motor of FIG. FIG. 15 shows the mounting plate 10E in the brushless motor of FIG. 13, where (a) is a plan view, (b) is a cross-sectional view taken along line II of (a), and (c) is J of (a). FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that aspects or technical features of the present invention are not limited to those described below, but are described in the whole specification and drawings, or invented by the person skilled in the art from those descriptions. It is recognized on the basis of.

(First embodiment)
A brushless motor according to a first embodiment of the present invention will be described with reference to FIGS.
The brushless motor of this example is an outer rotor type motor, and mainly includes a mounting plate 10A, a bearing portion 20, a stator 30, a rotor 40, a circuit board 50A, and an electric circuit member 60.

  The mounting plate 10 is composed of a plate member having rigidity made of metal, resin, or the like, and in particular, a processed metal plate such as an iron plate or an aluminum plate is suitable. In this example, an iron substrate is used.

The mounting plate 10 has a bearing holding portion 11 and a substrate holding portion 12.
The bearing holding part 11 has a disk shape, and has a bearing holding hole 11a for fitting and holding a bearing holder 21 (described later) at the center thereof, and three bearings are equally spaced around the bearing holding hole 11a. A mounting hole 11b is provided. The mounting hole 11b is for fixing the motor to a projector device (not shown) in which the motor is built with a screw or the like.

  The substrate holding part 12 is a part for fixing the circuit board 50 </ b> A, and extends in a rectangular shape outward from the bearing holding part 11. The substrate holding part 12 is provided with an opening 12a penetrating in a rectangular shape that is slightly smaller than the circuit board 50A at a substantially central portion. Further, a groove portion 12b reaching the outer edge portion from the opening portion 12a is provided on the lower surface of the substrate holding portion 12. The depth and width W of the groove 12b are approximately the same as the thickness and width of the electric circuit member 60.

The bearing unit 20 includes a bearing holder 21, a bearing 22, and a thrust plate 23.
The bearing holder 21 has a bottomed cylindrical shape, and is fitted and fixed to the bearing holding hole 11a of the mounting plate 10A by press fitting or the like. The bearing holder 21 can be an integrally molded product made of a resin material excellent in oil resistance, heat resistance, shape stability, or the like, a metal material cut product, a deep drawing product, or the like. Goods are used.
The bearing 22 is a radial bearing that rotatably supports the rotating shaft 41, and a cylindrical sintered metal is impregnated with lubricating oil. The bearing 22 is fitted and fixed inside the bearing holder 21.
The thrust plate 23 is made of a wear-resistant resin plate and supports the lower end of the rotating shaft 41.

The stator 30 includes a stator core 31, a core cover 32, and a coil 33.
The stator core 31 is composed of a laminated body of plate-like cores on which a plurality of salient poles are formed, and is fixed in a state of being placed on a stepped portion formed on the outer periphery of the bearing holder 21. A core cover 32 made of an insulating resin is disposed on the surface of the stator core 31, and a coil 33 is wound through the core cover 32.

The rotor 40 includes a rotating shaft 41, a rotor case 42 that rotates integrally with the rotating shaft 41, and a magnet 43 that is fixed to the inner side of the rotor case 42 and disposed opposite to the outer periphery of the stator 30.
The rotary shaft 41 is supported at the lower end by the thrust plate 23 and is rotatably supported by the bearing 22.
The rotor case 42 is formed in a cap shape with a magnetic plate material, and includes a cylindrical portion 42a formed in a cylindrical shape coaxially with the rotation shaft 41, and an upper surface portion 42b covering the upper surface of the cylindrical portion 42a. Yes. A burring portion 42c is formed at the center of the upper surface portion 42b, and the rotating shaft 41 is press-fitted and fixed to the burring portion 42c.

  A cylindrical magnet 43 that is opposed to the salient pole of the stator core 31 in the radial direction is fitted and fixed inside the cylindrical portion 42a of the rotor case. The magnet 43 is magnetized with a plurality of N poles and S poles alternately in the circumferential direction.

  The circuit board 50A is made of a known printed circuit board (PWB, PCB, etc.), and has four first land portions 51 to which terminals (leader wires) 33a of the coils 33 are solder-connected on the upper surface thereof, The connection terminal 61 has four second land portions 52 to which solder connection is made. Further, a Hall IC or the like for detecting the rotational position of the rotor is incorporated in the circuit board 50A as necessary.

The circuit board 50 </ b> A has a rectangular shape that is substantially the same size as the board holding unit 12, and the three outer sides thereof coincide with the three outer sides of the board holding unit 12.
The circuit board 50A is fixed to the lower surface of the substrate holding part 12 so that the surface on which the first land part 51 and the second land part 52 are formed faces the mounting plate 10A. Specifically, the peripheral edge of the circuit board 50A is fixed to a portion around the opening 12a excluding the groove 12b of the mounting plate 10A with a double-sided tape, an adhesive, or the like.
In the circuit board 50A fixed to the mounting plate 10A in this way, the first land portion 51 and the second land portion 52 are located in the opening 12a, and the first land portion 51 is bearing-supported more than the second land portion 52. Located on the side close to the part 11.
The terminal 33a of the coil 33 is solder-connected to the first land portion 51 through the opening 12a. Since the mounting plate 10A of this example is conductive, the region of the mounting plate 10A located in the vicinity of the first land portion 51 is a sheet in order to ensure insulation between the terminal 33a of the coil 33 and the mounting plate 10A. Covered with a cylindrical insulator 70.

The electric circuit member 60 is composed of a strip-shaped FFC (flexible flat cable) having a plurality of connection terminals at both ends, an FPC (flexible printed circuit board), or the like, and a terminal 33a of the coil 33 and terminals of an external circuit (not shown) together with the circuit board 50A. This is for connecting the parts.
The electric circuit member 60 of this example has four connection terminals 61 at both ends, and the four connection terminals 61 at one end are soldered to the four second land portions 52 of the circuit board 50A, respectively, and the other end is not connected. The four connection terminals shown are connected to an external circuit.

One end side of the electric circuit member 60 is sandwiched between the mounting plate 10A and the circuit board 50A and fixed in an unbent state. Specifically, one end side of the electric circuit member 60 is sandwiched between the mounting plate 10A and the circuit board 50A while being fitted in the groove 12b of the board holding part 12, and the upper and lower surfaces are respectively separated by a double-sided tape or an adhesive. It is fixed to the mounting plate 10A and the circuit board 50A.
The electric circuit member 60 is led out from between the mounting plate 10A and the circuit board 50A via the groove 12b.

According to the brushless motor of the present example having the above-described configuration, one end of the electric circuit member 60 is sandwiched between the mounting plate 10A and the circuit board 50A, and the electric circuit member 60 is bonded and fixed on both upper and lower surfaces of the electric circuit member 60. One end of 60 can be firmly fixed. Therefore, even if a twisting or pulling force is applied to the electric circuit member 60, a large force is not directly applied to the solder connection portion of the connection terminal 61, and the reliability of the solder connection portion of the connection terminal 61 can be improved.
Further, it is not necessary to provide a protruding portion for locking the electric circuit member on the mounting plate 10A, and the electric circuit member 60 can be firmly fixed in the region where the circuit board 50A is arranged, so that the mounting plate 10A becomes unnecessarily large. Nor.
Moreover, since it is the structure which fixes the electric circuit member 60 from both sides, without bending, the disconnection in an electric circuit member can also be prevented effectively.

  Further, in the brushless motor of this example, one end of the electric circuit member 60 is accommodated in the groove portion 12b having the same width and depth as the width and thickness of the electric circuit member 60, and the electric circuit member 60 is externally connected via the groove portion 12b. Therefore, the electric circuit member 60 can be fixed extremely firmly between the mounting plate 10A and the circuit board 50A, and the reliability of the solder connection portion can be further improved.

  Further, in the brushless motor of this example, the opening 12a is provided in the mounting plate 10A, the circuit board 50A is fixed to the lower surface of the mounting plate 10A, and each land portion of the circuit board 50A is exposed from the opening 12a. In addition to easy solder connection, insulation from the coil terminal can be easily ensured even when a conductive material is used as the mounting plate 10A.

  In the brushless motor of this example, since it is solder-connected in the opening 12a of the mounting plate 10A, for example, by filling the opening 12a with an insulating material such as an insulating resin at the end of the manufacturing process, The strength of the solder connection portion can be further increased. In this case, the insulating material is preferably loaded so as to cover at least one end of the electric circuit member 60 exposed in the opening 12a and the connection terminal 61.

(Second Embodiment)
A brushless motor according to a second embodiment of the present invention will be described with reference to FIGS. 4 to 6, members that are the same as those in FIGS. 1 to 3 are given the same reference numerals, and descriptions of overlapping portions are omitted.

In the first embodiment, the circuit board 50A is fixed to the lower surface of the mounting plate 10A. In this example, the circuit board 50B is fixed to the upper surface of the mounting plate 10B.
For this reason, the mounting plate 10B of this example is provided with a groove portion 12b on the upper surface of the substrate holding portion 12 so as to reach one side of the outer edge portion from the opening portion 12a.

  The circuit board 50B has substantially the same size as the board holding part 12, the three outer sides substantially coincide with the three outer sides of the board holding part 12, and one side on the bearing holding part 11 side is recessed in an arc shape. It has a shape. The circuit board 50 </ b> B is provided with a through hole (not shown) through which the connection terminal 61 is inserted in the center of the second land portion 52.

The circuit board 50B is fixed to the upper surface of the substrate holding part 12 so that the surface on which the first land part 51 and the second land part 52 are formed is on the upper side. Specifically, the peripheral edge of the circuit board 50B is fixed to a portion around the opening 12a excluding the groove 12b of the mounting plate 10B by a double-sided tape, an adhesive, or the like.
In the circuit board 50B fixed to the mounting plate 10B in this way, the first land portion 51 and the second land portion 52 are located on the opening 12a, and the terminal 33a of the coil 33 is connected to the first land portion 51. Soldered.

One end side of the electric circuit member 60 is sandwiched between the mounting plate 10B and the circuit board 50B and fixed in an unfolded state. Specifically, one end side of the electric circuit member 60 is sandwiched between the mounting plate 10B and the circuit board 50B while being fitted in the groove 12b of the board holding part 12, and the upper and lower surfaces are respectively separated by a double-sided tape or an adhesive. It is fixed to the circuit board 50B and the mounting plate 10B.
The four connection terminals 61 at one end of the electric circuit member 60 are inserted into the through holes connected to the second land portion 52 from the lower surface of the circuit board 50B, and soldered to the second land portion 52 on the upper surface of the circuit board 50B. .

  Also in the brushless motor of this example having the above configuration, one end of the electric circuit member 60 is sandwiched between the mounting plate 10B and the circuit board 50B, and the electric circuit member 60 is bonded and fixed from both sides in an unfolded state. Therefore, the reliability of the solder connection portion of the connection terminal 61 can be improved.

  In the brushless motor of this example, after the terminal 33a of the coil 33 and the connection terminal 61 of the electric circuit member 60 are soldered to each land portion of the circuit board 50B, the circuit board 50B and the electric circuit member 60 are simultaneously bonded to the mounting plate 10B. Can be fixed. For this reason, all the soldering operations can be performed continuously at the same time, and the working efficiency can be improved.

  In the brushless motor of this example, the circuit board 50B is fixed to the upper surface of the mounting plate 10B, and the first land portion 51 and the second land portion 52 are formed on the upper surface of the circuit board 50B. In particular, it is not necessary to perform an insulation process when a conductive material is used.

  Also in this example, the strength of the solder connection portion can be further increased by filling the opening 12a of the mounting plate 10A with an insulating material such as an insulating resin.

(Third embodiment)
A brushless motor according to a third embodiment of the present invention will be described with reference to FIGS. 7 to 9, the same members as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description of the overlapping portions is omitted.

In the first and second embodiments, the mounting plate is provided with the opening 12a. However, the mounting plate 10C of this example is provided with a recess 12c instead of the opening 12a. The recess 12 c is for accommodating one end of the electric circuit member 60, and is formed on the upper surface of the mounting plate 10 with a depth equal to or greater than the thickness of the electric circuit member 60.
The recess 12c includes a groove 12d that reaches one side of the outer edge, and the width and depth of the groove 12d are approximately the same as the width and thickness of the electric circuit member 60.

The circuit board 50C is fixed to the upper surface of the substrate holding unit 12 so that the surface on which the first land portion 51 and the second land portion 52 are formed is on the upper side. Specifically, the peripheral edge of the circuit board 50C is fixed to a portion around the recess 12c of the mounting plate 10C with a double-sided tape, an adhesive, or the like.
In the circuit board 50C fixed to the mounting plate 10C in this way, the first land portion 51 and the second land portion 52 are located above the recess 12c, and the terminal 33a of the coil 33 is soldered to the first land portion 51. Attached.

One end side of the electric circuit member 60 is sandwiched between the mounting plate 10C and the circuit board 50C and fixed in an unbent state. Specifically, one end side of the electric circuit member 60 is sandwiched between the mounting plate 10C and the circuit board 50C while being fitted in the groove 12d of the substrate holding unit 12, and is attached to the mounting plate 10C by a double-sided tape, an adhesive, or the like. It is fixed to the circuit board 50C.
Further, the four connection terminals 61 at one end of the electric circuit member 60 are inserted into through holes connected to the second land portion 52 from the lower surface of the circuit board 50C, and are soldered to the second land portion 52 on the upper surface of the circuit board 50C. The

  Also in the brushless motor of this example having the above configuration, one end of the electric circuit member 60 is sandwiched between the mounting plate 10C and the circuit board 50C, and the electric circuit member 60 is bonded and fixed from both sides in an unfolded state. Therefore, the reliability of the solder connection portion of the connection terminal 61 can be improved.

Moreover, in the brushless motor of this example, since the recessed part 12c is formed in the board | substrate holding part 12 of the mounting plate 10C instead of the opening part, the rigidity of the part which fixes the electric circuit member 60 can be improved, and a connection terminal The reliability of the solder connection portion 61 can be further improved.
Further, as in the second embodiment, all the soldering operations can be performed continuously at once, and the working efficiency can be improved.

  In the brushless motor of this example, when a conductive material is used as the mounting plate 10C, the region of the mounting plate 10C located in the vicinity of the connecting terminal 61 is insulated in sheet form in order to insulate the mounting plate 10C from the connecting terminal 61. Cover with body.

  Further, for example, by providing a small hole communicating with the recess 12c in the mounting plate 10C and filling the recess 12c with an insulating material such as an insulating resin from this hole, the strength of the solder connection portion can be further increased.

(Fourth embodiment)
A brushless motor according to a fourth embodiment of the present invention will be described with reference to FIGS. 10 to 12, members that are the same as those in FIGS. 1 to 3 are given the same reference numerals, and descriptions of overlapping portions are omitted.

The mounting plate 10D of this example has upright portions 12e and 12f on both sides along the extending direction of the substrate holding portion 12, and has three upright portions 12g, 12h and 12i on the tip side.
The heights of the rising portions 12e, 12f, 12g, and 12h are equal, and the rising portion 12i is lower than the rising portions by the thickness of the electric circuit member 60. Further, the width of the upright portion 12 i is approximately the same as the width of the electric path member 60.

The circuit board 50D is fixed to the upper surface of the substrate holding part 12 so that the surface on which the first land part 51 and the second land part 52 are formed is on the lower side. Specifically, the peripheral edge of the circuit board 50D is fixed with a double-sided tape, an adhesive, or the like in a state where it is placed on the upright portions 12e, 12f, 12g, and 12h.
In the circuit board 50D thus fixed to the mounting plate 10D, the first land portion 51 and the second land portion 52 are held with a predetermined gap from the mounting plate 10D, and the end of the coil 33 is held on the first land portion 51. 33a is soldered.

One end side of the electric circuit member 60 is sandwiched between the mounting plate 10D and the circuit board 50D and fixed in an unfolded state. Specifically, one end side of the electric circuit member 60 is sandwiched between the mounting plate 10D and the circuit board 50D in a state of being placed on the upright portion 12i, and the upper and lower surfaces thereof are respectively mounted on the circuit board 50D by a double-sided tape or an adhesive. And fixed to the mounting plate 10D.
Further, the four connection terminals 61 at one end of the electric circuit member 60 are soldered to the second land portion 52 on the lower surface of the circuit board 50D.

Also in the brushless motor of this example having the above configuration, one end of the electric circuit member 60 is sandwiched between the mounting plate 10D and the circuit board 50D, and the electric circuit member 60 is bonded and fixed from both sides in an unbent state. Therefore, the reliability of the solder connection portion of the connection terminal 61 can be improved.
Further, since the solder connection portion is not exposed on the surface, there is no risk of malfunction due to contact with external components.
Further, as in the second embodiment, all the soldering operations can be performed continuously at once, and the working efficiency can be improved.

  In the brushless motor of the present example, when a conductive material is used as the mounting plate 10D, the mounting plate facing the terminal 33a and the connection terminal 61 in order to ensure insulation between the terminal 33a and the connection terminal 61 and the mounting plate 10D. The 10D region is preferably covered with a sheet-like insulator.

  Also in this example, the strength of the solder connection portion can be further increased by loading an insulating material such as an insulating resin into the gap between the mounting plate 10D and the circuit board 50D.

(Fifth embodiment)
A brushless motor according to a fifth embodiment of the present invention will be described with reference to FIGS. 13 to 15, the same members as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description of the overlapping portions is omitted.

The mounting plate 10E of this example has upright portions 12j and 12k on both sides along the extending direction of the substrate holding portion 12, and has three upright portions 12m, 12l and 12n on the tip side.
The upright portions 12j, 12k, 121, and 12m are inclined surfaces whose upper surfaces are inclined so that the bearing holding portion 11 side is lowered, and these inclined surfaces are in the same plane. The rising portion 12n is lower than the rising portions 12l and 12m. Further, the width of the raised portion 12n is approximately the same as the width of the electric circuit member 60.

The circuit board 50E is fixed to the upper surface of the substrate holding part 12 so that the surface on which the first land part 51 and the second land part 52 are formed is on the upper side. Specifically, the peripheral edge portion of the circuit board 50E is fixed with a double-sided tape, an adhesive, or the like in a state where it is placed on the upright portions 12j, 12k, 121, and 12m.
Thus, the circuit board 50E fixed to the mounting plate 10E is inclined so that the bearing holding portion 11 side is lowered, and the terminal 33a of the coil 33 is soldered to the first land portion 51.

One end side of the electric circuit member 60 is sandwiched between the mounting plate 10E and the circuit board 50E and fixed in an unfolded state. Specifically, one end side of the electric circuit member 60 is sandwiched between the mounting plate 10E and the circuit board 50E in a state of being placed on the upright portion 12n, and the upper and lower surfaces are respectively placed on the circuit board 50E by a double-sided tape, an adhesive, or the like. And fixed to the mounting plate 10E.
The four connection terminals 61 at one end of the electric circuit member 60 are inserted into the through holes connected to the second land portion 52 from the lower surface of the circuit board 50E, and are soldered to the second land portion 52 on the upper surface of the circuit board 50E.

Also in the brushless motor of this example having the above configuration, one end of the electric circuit member 60 is sandwiched between the mounting plate 10E and the circuit board 50E, and the electric circuit member 60 is bonded and fixed from both sides in an unfolded state. Therefore, the reliability of the solder connection portion of the connection terminal 61 can be improved.
Further, since the circuit board 50E is inclined so that the bearing holding portion 11 side is lowered, in the structure in which a part of the circuit board 50E is arranged directly under the rotor 40, the height of the entire motor can be suppressed low. .
Further, as in the second embodiment, all the soldering operations can be performed continuously at once, and the working efficiency can be improved.

  In the brushless motor of this example, when a conductive material is used as the mounting plate 10E, the region of the mounting plate 10E located in the vicinity of the connection terminal 61 is insulated in sheet form in order to insulate the mounting plate 10E from the connection terminal 61. Cover with body.

  Although the embodiments of the present invention have been described above, these embodiments can be appropriately modified without departing from the spirit of the present invention.

10A, 10B, 10C, 10D, 10E Mounting plate 11 Bearing holding portion 11a Bearing holding hole 11b Mounting hole 12 Substrate holding portion 12a Opening portion 12b Groove portion 12c Recessed portion 12d Groove portion 12e to 12n Upright portion 20 Bearing portion 21 Bearing holder 22 Bearing 23 Thrust Plate 30 Stator 31 Stator core 32 Core cover 33 Coil 33a End of coil (lead line)
DESCRIPTION OF SYMBOLS 40 Rotor 41 Rotating shaft 42 Rotor case 42a Cylindrical part 42b Upper surface part 42c Burring part 43 Magnet 50A, 50B, 50C, 50D, 50E Circuit board 51, 52 Land part 60 Electric circuit member 61 Connection terminal 70 Sheet-like insulator

Claims (12)

A stator having a coil;
A rotor having a magnet facing the outer periphery of the stator;
A mounting plate for holding the stator on the upper surface;
A strip-shaped electric circuit member having a plurality of connection terminals at both ends;
A circuit board having a first land portion to which a terminal of the coil is solder-connected and a second land portion to which the plurality of connection terminals at one end of the electric circuit member are solder-connected,
The circuit board is fixed to the mounting plate;
The brushless motor, wherein the one end side of the electric circuit member is sandwiched and fixed between the mounting plate and the circuit board in an unbent state. The mounting plate has an opening;
The brushless motor according to claim 1, wherein the circuit board is fixed around the opening of the mounting plate. The mounting plate has a groove reaching the outer edge from the opening,
The brushless motor according to claim 2, wherein the electric path member is led out from between the mounting plate and the circuit board via the groove. The circuit board has the first land portion and the second land portion on an upper surface, and is fixed to a lower surface of the mounting plate,
The first land portion and the second land portion are located in the opening,
4. The brushless motor according to claim 2, wherein an end of the coil is solder-connected to the first land portion through the opening. 5.   The brushless motor according to claim 4, wherein the mounting plate has conductivity, and a region located in the vicinity of the first land portion is covered with a sheet-like insulator.   4. The brushless motor according to claim 2, wherein the circuit board has the first land portion and the second land portion on an upper surface, and is fixed to the upper surface of the mounting plate. 5.   The insulating resin is loaded in the opening, and one end of the electric circuit member and the connection terminal arranged in the opening are covered with the insulating resin. A brushless motor according to any one of the above. The mounting plate has a concave portion for accommodating the one end of the electric circuit member on an upper surface,
The brushless motor according to claim 1, wherein the circuit board is fixed around the recess. The mounting plate has a raised portion on the upper surface,
The brushless motor according to claim 1, wherein the circuit board is fixed to the mounting plate in a state of being placed on the upright portion.   The brushless motor according to claim 9, wherein the upright portion is inclined so that the stator side is lowered. The circuit board has the first land portion and the second land portion on a lower surface,
11. The mounting plate has conductivity, and a sheet-like insulator is interposed between the mounting plate and at least the first land portion and the second land portion. The brushless motor according to any one of the above.   The insulating resin is loaded between the mounting plate and the circuit board, and one end of the electric circuit member and the connection terminal are covered with the insulating resin. The brushless motor described in 1.

Images