JP2013207867A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor capable of preventing spring-back of a folding piece even in a conductor wire with a low melting point while using a structure of a terminal fitting holding the conductor wire with a conventional folding piece and an opposite face.SOLUTION: A terminal fitting 12 is made of a metal plate material, and comprises: a connection section 14 electrically connected to a circuit board on one end; an insertion section 15 inserted in a terminal board 13 of an insulator 7 on the other end; a folding piece 17 formed by cutting and raising a portion between the connection section 14 and the insertion section 15 and folding it toward the insertion section 15; and an opposite plane 18 opposed to the folding piece 17. A first serration 170 and a second serration 180 to be electrically jointed to a lead-out section 6A of a conductor wire 6 when holding the lead-out section 6A wound around the insulator 7 with the folding piece 17 and the opposite plane 18 are provided on the folding piece 17 and the opposite plane 18. While the lead-out section 6A is held by the folding piece 17 and the opposite plane 18, tip sides of the insertion section 15 and the folding piece 17 are inserted in the terminal board 13.

Description

  The present invention relates to a motor provided with a terminal fitting for electrically connecting a winding and a circuit board.

  2. Description of the Related Art Conventionally, there is known a terminal fitting to which a conducting wire having a core wire made of a stranded wire of aluminum or an aluminum alloy and a coating covering the outer periphery of the core wire is joined. As this type of terminal fitting, there is a terminal fitting provided with serrations to which conductive wires are joined (for example, see Patent Document 1). This terminal fitting has an F-crimp-shaped crimp structure so that the core wire bites into the serration by crimping the core wire, and electrical connection with the conductive wire is obtained, and the joint portion with the core wire does not spring back. .

  In addition, as a terminal fitting for electrically connecting a winding wound around a stator provided in a motor via an insulator and a circuit board attached to an end surface of the insulator, the terminal fitting is made of a metal plate material, and one of the metal plate materials. A terminal fitting is known in which a winding is sandwiched between a folded piece that is cut up and folded and a facing surface of a metal plate facing the folded piece. In this terminal fitting, an electrical connection is obtained by applying a predetermined voltage between the folded piece and the opposing surface to weld the winding and the terminal fitting, and the junction with the winding does not spring back. It is like that.

  By the way, a conductive wire provided with a core wire made of copper and a coating covering the outer periphery of the core wire is used for this winding. When aluminum or an aluminum alloy is used instead of copper as the core wire, aluminum or an aluminum alloy is used. Since the melting point is lower than that of copper, if the same voltage as that when copper is used as the core wire is applied between the folded piece and the facing surface, there is a possibility that the conducting wire may melt and break.

  In order to solve the problem that this conductor may melt and break, as a terminal fitting that electrically connects the winding and the circuit board, a terminal with serration instead of welding the winding and the terminal fitting Although it is conceivable to use metal fittings, the core wire of the lead wire used for the winding is a single wire, not a stranded wire, so use a crimped crimp structure with an F-crimp shape that bites into the gap of the stranded wire so that it does not spring back There was a problem that could not.

JP 2010-55936 A

  In view of the above problems, the present invention can prevent a springback of a folded piece even for a conductive wire having a low melting point, while utilizing the structure of a terminal fitting that sandwiches the conductive wire between a conventional folded piece and an opposing surface. An object of the present invention is to provide a motor that can be used.

  In order to solve the above problems, a motor according to the present invention includes a stator in which a conductor is wound around a stator core via an insulator, a rotor arranged to face the stator in a rotatable state, and a circuit attached to the insulator at intervals. A board and a terminal fitting attached between the insulator and the circuit board and electrically connecting the conductor and the circuit board are provided. The insulator includes a terminal block into which the terminal fitting is inserted. The terminal fitting is made of a metal plate, has a connection part electrically connected to the circuit board at one end, an insertion part to be inserted into the terminal block at the other end, and an insertion part by cutting between the connection part and the insertion part. A folding piece folded back toward the side and a facing surface facing the folded piece. At least one of the folded piece or the opposed surface has a serration for electrically joining the drawn portion when the drawn portion of the conductive wire wound around the insulator is sandwiched between the folded piece and the opposed surface, and the drawn portion The insertion part and the tip end side of the folded piece were inserted into the terminal block with the folded piece held between the folded piece and the opposing surface.

  According to the motor of the present invention, the spring-back of the folded piece can be prevented even when the conductor has a low melting point, while utilizing the conventional structure of the terminal metal fitting that sandwiches the conductive wire between the folded piece and the opposing surface. .

It is sectional drawing which shows the motor by this invention. It is a side view which shows the insulator with which the motor was equipped, the terminal metal fitting, and the circuit board. It is explanatory drawing which shows the terminal metal fitting with which the motor was equipped, (a) is a top view, (b) is a front view, (c) is a side view. It is explanatory drawing which shows the terminal block with which the insulator was equipped, (a) is a top view, (b) is A-A 'sectional drawing of (a). It is explanatory drawing which shows the method of joining a conducting wire to the terminal metal fitting with which the motor was equipped, (a) is a side view which shows the state which arrange | positions a conducting wire between a folding piece and an opposing surface, (b) is facing a folding piece. The side view which shows the state which electrically connects a terminal metal fitting and a conducting wire by serration when pinching a conducting wire with a surface, (c) is a side view which shows the state which contact | abuts the front end side of a return | turnback piece to an opposing surface. . It is explanatory drawing which shows the state which inserted the terminal metal fitting which joined the conducting wire in the terminal block, (a) is a front view, (b) is B-B 'sectional drawing of (a).

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. As a motor according to the present invention, a motor provided with a terminal fitting for electrically connecting a winding and a circuit board will be described as an example. In addition, although the radial gap type motor which has an inner rotor structure is demonstrated as a motor provided with the terminal metal fitting by this embodiment, you may apply to an axial gap type motor.

  As shown in FIG. 1, the motor M provided with the terminal fitting according to the present embodiment is attached to the cylindrical stator 1, the rotor 2 disposed on the inner diameter side of the stator 1, and one end side of the stator 1 with a gap. A circuit board 4, a stator 1, a rotor 2, and a bracket 5 covering the circuit board 4 and the like are provided.

  The stator 1 includes a stator core 1A, an insulator 7 formed of synthetic resin around the stator core 1A, and a conductive wire 6 wound around the insulator 7. A base support portion 8 that supports the circuit board 4 is formed on a base portion 7A (see FIG. 2) of the insulator 7 that faces the circuit board 4. The conducting wire 6 is composed of a core wire made of a single wire of aluminum or aluminum alloy and a coating covering the outer periphery of the core wire.

  The rotor 2 has a rotation shaft 2B at the center and a rotor core 2A on the outer periphery of the rotation shaft 2B. A permanent magnet is attached to the outer periphery of the rotor core 2A. The rotor 2 rotates when the permanent magnet receives the magnetic force of the rotating magnetic field generated by energizing the conducting wire 6. The rotor 2 may be one in which a permanent magnet is embedded inside the rotor core 2A.

  In the circuit board 4, the electronic component 3 that generates heat when energized is mounted on the surface opposite to the surface facing the insulator 7. The electronic component 3 controls the current flowing through the conducting wire 6 provided in the stator 1. Between the electronic component 3 and the bracket 5, a heat radiating sheet 9, an aluminum block 10, and silicon 11 are arranged in this order. The heat generated in the electronic component 3 by energization is transferred to the outside from the bracket 5 through the heat radiating sheet 9, the aluminum block 10, and the silicon 11.

  As shown in FIG. 2, the motor M includes a terminal fitting 12 that is attached between the insulator 7 and the circuit board 4 and to which a conducting wire 6 (not shown) is joined. A terminal block 13 into which the terminal fitting 12 is inserted is formed on the base portion 7 </ b> A facing the circuit board 4 of the insulator 7. The circuit board 4 is formed with a board support part hole 20 into which the tip of the board support part 8 is inserted and a terminal hole 21 into which the terminal fitting 12 is inserted.

  The circuit board 4 is supported by the insulator 7 by inserting the tip of the board support part 8 into the board support part hole 20. The circuit board 4 is electrically connected to the conductor 6 through the terminal fitting 12 by inserting one end of the terminal fitting 12 into the terminal hole 21 and soldering to the wiring pattern on the circuit board 4. The terminal fitting 12 is held by the insulator 7 by inserting the other end of the terminal fitting 12 into the terminal block 13.

  Next, the terminal metal fitting 12, which is a feature of the present invention, will be described with reference to FIG. As shown in FIGS. 3A to 3C, the terminal fitting 12 is made of, for example, a metal plate material obtained by applying tin plating to a brass plate material. The terminal fitting 12 is inserted into the terminal hole 21 at one end and electrically connected to the circuit board, the insertion portion 15 to be inserted into the terminal block 13 at the other end, and near one end of the insertion portion 15. A pair of projecting pieces 16 for holding the insertion portion 15 on the terminal block 13, and a turn-up between the connection portion 14 and the insertion portion 15 (center portion of the terminal fitting 12) and turned back toward the insertion portion 15. A piece 17 and a facing surface 18 facing the folded piece 17 are provided. The terminal fitting 12 holds the lead-out portion of the conducting wire 6 wound around the insulator 7 shown in FIG. 1 between the folded piece 17 and the facing surface 18.

  When the lead-out portion of the conducting wire 6 is sandwiched between the folded piece 17 and the opposing surface 18, a first serration 170 for electrically joining the lead-out portion of the conducting wire 6 and a second serration 180 facing the first serration 170, Is provided. A plurality of first serrations 170 and second serrations 180 are provided on the base side of the folded piece 17 and the opposing surface 18, respectively, and are alternately arranged so as not to face each other across the lead-out portion of the conducting wire 6.

  The first serration 170 and the second serration 180 are formed by punching from the direction of arrow A shown in FIG. 3 (c) using a jig (not shown), and alternately forming convex portions and concave portions therebetween. is there. The first serration 170 and the second serration 180 are formed to extend in a direction intersecting the length direction of the conductor 6 when the lead portion of the conductor 6 is sandwiched. Note that the folded piece 17 and the facing surface 18 in which only the first serration 170 or the second serration 180 is provided may be used.

  Next, the terminal block 13 which is a feature of the present invention in which the terminal fitting 12 is inserted will be described with reference to FIG. As shown in FIG. 4A and FIG. 4B, the terminal block 13 has a rectangular parallelepiped shape that matches the shape of the terminal fitting 12 as a whole. The terminal block 13 includes an insertion hole 130 into which the terminal fitting 12 is inserted. The insertion hole 130 is provided in the terminal fitting 12 and a first insertion hole 1301 for inserting the insertion portion 15 provided in the terminal fitting 12. It has the 2nd insertion hole 1302 for inserting the front end side of the turned-back piece 17 which was made. The first insertion hole 1301 is formed in a deeper and larger hole than the second insertion hole 1302 because the folded piece 17 is folded back toward the insertion portion 15. The second insertion hole 1302 is formed so as to be connected to the first insertion hole 1301.

  A joining method for joining the conductor 6 to the terminal fitting 12 having the structure described above will be described with reference to FIG. First, as illustrated in FIG. 5A, the lead-out portion 6 </ b> A of the conducting wire 6 is disposed between the folded piece 17 and the facing surface 18, that is, between the first serration 170 and the second serration 180. At this time, it arrange | positions so that the length direction of the conducting wire 6 may turn into the direction which cross | intersects the 1st serration 170 and the 2nd serration 180. FIG.

  Next, as illustrated in FIG. 5B, the lead portion 6 </ b> A of the conducting wire 6 is sandwiched between the folded piece 17 and the facing surface 18, and the terminal fitting 12 and the conducting wire 6 are electrically joined. At this time, the base side of the folded piece 17 is caulked so that the front end side of the folded piece 17 abuts against the opposing surface 18. As a result, the first serration 170 and the second serration 180 break the coating of the conductive wire 6 and are electrically joined to the core wire of the conductive wire 6.

  Finally, as shown in FIG. 5C, the tip end side of the folded piece 17 is caulked so that the tip 171 of the folded piece 17 is in contact with the facing surface 18. The conducting wire 6 is joined to the terminal fitting 12 by the joining method described above.

  Thereafter, since the terminal fitting 12 to which the conducting wire 6 is joined is assembled as the motor M, the distal end side of the folded piece 17 together with the insertion portion 15 of the terminal fitting 12 is inserted into the terminal block 13 of the insulator 7 to hold the terminal fitting 12. At the same time, the connecting portion 14 of the terminal fitting 12 is inserted into the terminal hole 21 of the circuit board 4 and soldered to the wiring pattern on the circuit board 4.

  Here, a state where the terminal fitting 12 to which the conducting wire 6 is joined is inserted into the terminal block 13 will be described with reference to FIG. As shown in FIGS. 6A and 6B, the insertion portion 15 provided in the terminal fitting 12 is inserted into the first insertion hole 1301, and the folded piece 17 is in contact with the facing surface 18. Is inserted into the second insertion hole 1302. Since the insertion portion 15 presses the wall surface of the first insertion hole 1301 by the protruding piece 16, the insertion portion 15 is held in the first insertion hole 1301. By holding the insertion portion 15 in the first insertion hole 1301, the distal end side of the folded piece 17 also remains in the second insertion hole 1302, and the folded piece between the wall surfaces of the first insertion hole 1301 and the second insertion hole 1302. The distal end side of 17 is held in contact with the metal plate together with the insertion portion 15.

  Note that the terminal fitting 12 does not necessarily have to be inserted into the terminal block 13 in a state where the tip end side of the folded piece 17 is in contact with the facing surface 18, and between the tip side of the folded piece 17 and the facing surface 18. Even if there is a slight gap, it is sufficient that the folded portion 17 and the facing surface 18 hold the lead portion 6A of the lead wire 6 therebetween.

  According to the motor M of the present invention described above, the insulator 7 includes the terminal block 13 into which the terminal fitting 12 is inserted. The terminal fitting 12 is made of a metal plate, and includes a connection portion 14 that is electrically connected to the circuit board 4 at one end, an insertion portion 15 that is inserted into the terminal block 13 at the other end, and the connection portion 14 and the insertion portion 15. A folded piece 17 that is cut and raised toward the insertion portion 15 and a facing surface 18 that faces the folded piece 17 are provided.

  When the lead-out portion 6A of the conducting wire 6 wound around the insulator 7 is sandwiched between the turn-up piece 17 and the facing surface 18 between the folding piece 17 and the facing surface 18 provided in the terminal fitting 12, the lead-out portion 6A and the facing surface 18 are electrically connected. 1st serration 170 and 2nd serration 180 for joining to. The insertion portion 15 and the distal end side of the folded piece 17 are inserted into the terminal block 13 with the drawn portion 6A held between the folded piece 17 and the facing surface 18.

  In the present invention, the conductive wire 6 is sandwiched between the first serration 170 and the second serration 180 to break the coating of the conductive wire 6, and is electrically joined to the core wire of the conductive wire 6. By inserting the distal end side, the folded piece 17 is held in contact with the metal plate material. This eliminates the need for applying a predetermined voltage between the folded piece and the facing surface to weld the lead wire and the terminal fitting, unlike the conventional terminal fitting. Therefore, even if the conducting wire 6 joined to the terminal fitting 12 is provided with a core wire such as aluminum having a melting point lower than that of copper, the possibility that the conducting wire 6 is melted and disconnected can be prevented. Moreover, in the terminal metal fitting 12, without using the crimping structure of F crimp shape like patent document 1, the front end side of the folding piece 17 is inserted in the terminal block 13 with the insertion part 15, and the front end side of the folding piece 17 is made into metal. By holding the plate in contact with the plate material, it is possible to prevent the spring back of the joint portion with the conductor 6.

  Further, in the terminal fitting 12 of the present invention, the first serrations 170 of the folded pieces 17 and the second serrations 180 of the facing surface 18 are alternately arranged so as not to face each other across the lead portion 6A of the lead wire 6. Yes. As a result, by the first serration 170 and the second serration 180, the contact area between the terminal fitting 12 and the conductive wire 6 can be increased, and the electrical bondability of the conductive wire 6 can be improved. Moreover, since the 1st serration 170 and the 2nd serration 180 are not concentrated and pinched by one place of the conducting wire 6, the possibility that the conducting wire 6 may be disconnected can be reduced.

  In the terminal fitting 12 according to the present embodiment, the first serrations 170 and the second serrations 180 are arranged in a staggered manner so as not to face each other with the lead-out portion 6A of the conducting wire 6 interposed therebetween. Not limited to this, the first serration 170 and the second serration 180 may be arranged so as to face each other with the lead-out portion 6A of the conducting wire 6 interposed therebetween.

M Motor 1 Stator 1A Stator core 2 Rotor 2A Rotor core 2B Rotating shaft 3 Electronic component 4 Circuit board 5 Bracket 6 Conductor 6A Lead-out part 7 Insulator 7A Base 8 Substrate support part 9 Heat radiation sheet 10 Aluminum block 11 Silicon 12 Terminal metal fitting 13 Terminal block 130 Insertion Hole 1301 First insertion hole 1302 Second insertion hole 14 Connection portion 15 Insertion portion 16 Projection piece 17 Folding piece 170 First serration 171 Tip portion 18 Opposing surface 180 Second serration 20 Substrate support hole 21 Terminal hole

Claims (1)

A stator in which a conducting wire is wound around a stator core via an insulator, a rotor disposed to face the stator in a rotatable state, a circuit board attached to the insulator with a gap, and the insulator and the circuit board A motor provided with a terminal fitting attached between and electrically connecting the conductor and the circuit board,
The insulator includes a terminal block into which the terminal fitting is inserted,
The terminal fitting is made of a metal plate, and has a connection portion electrically connected to the circuit board at one end, an insertion portion to be inserted into the terminal block at the other end, and between the connection portion and the insertion portion. A folded piece that is cut and raised and folded toward the insertion portion, and a facing surface that faces the folded piece,
At least one of the folded piece or the opposed surface is for electrically connecting the drawn portion of the conducting wire wound around the insulator between the folded piece and the opposed surface when the folded portion is sandwiched between the folded piece and the opposed surface. Have serrations,
The motor according to claim 1, wherein the insertion portion and a distal end side of the folded piece are inserted into the terminal block in a state where the drawing portion is sandwiched between the folded piece and the facing surface.

Images