JP2010063362A - Stator and brushless motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brushless motor capable of easily connecting an end of a winding to a terminal. <P>SOLUTION: The brushless motor 1 is provided with: a stator 3 having a plurality of teeth 7 fixed to an inner circumference of a substantially bottomed cylindrical housing 2 and radially extended, and a winding 9 wound to each of teeth 7; and a rotor 4 having an axis of rotation 11 and a magnet 10 fixed to the axis of rotation 11 and arranged inside the stator 3, for relatively rotating with respect to the stator 3 by applying a current to the winding 9; a plate 5 for covering an opening 2a of the housing 2, and a metal terminal 6 fixed to the plate 5 and having a connection part 6a connecting the end 9a of the winding 9. A notch 5b penetrating in the axis direction of the axis of rotation 11 and opening outward in the radial direction is formed on the plate 5. The end 9a of the winding 9 inserted into the notch 5b is connected to the connection part 6a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stator and a brushless motor.

  Conventionally, as a brushless motor used in a power steering device of an automobile, for example, a stator in which windings are formed by concentrated winding around a plurality of teeth formed radially toward the center, and rotatably accommodated inside the stator. And a rotor (rotor) having a plurality of magnetic poles formed on the peripheral surface. A stator of such a brushless motor is wound with, for example, three sets of windings to which three-phase driving currents of U phase, V phase, and W phase having a predetermined phase difference are supplied. The ends of the windings are drawn out so as to extend in the axial direction, and are connected to terminals disposed at the ends of the brushless motor.

  As this connection method, for example, in Patent Document 1, a through-hole that penetrates the end of the winding of each phase is formed in the terminal at a position where the end of the winding of each phase is drawn out. A method of soldering by inserting an end portion is disclosed. If comprised in this way, even if it does not route the end part of each phase coil | winding inside a motor and put it in one place, it can electrically connect collectively by connecting each end part to a terminal. .

JP 2000-14069 A

  However, in the brushless motor of the above-mentioned document, the work of inserting the end portions of the windings of each phase into the corresponding through holes is a complicated operation that requires high accuracy. For this reason, the operation | work which inserts a several coil | winding in a through-hole as well as the operation | work which inserts each one coil | winding in a through-hole was difficult. Therefore, it is conceivable to increase the diameter of the through-hole to facilitate the insertion of the winding, but in that case, it is necessary to perform a connection operation such as soldering while holding the end of the winding inserted through the through-hole. As a result, there is a problem that the manufacturing operation becomes complicated.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a stator and a brushless motor capable of easily connecting the end of a winding to a terminal.

  The invention according to claim 1 is a stator comprising a plurality of teeth extending radially with respect to the rotation shaft of a three-phase motor, wherein a winding is wound around each tooth, and a plate is fixed to the stator. Is formed with a notch that penetrates in the axial direction of the rotating shaft and opens radially outward, and has one connection portion to which the end of the winding inserted through the notch is connected, and external power supply. Three terminals with one possible connector are fixed to the plate, the three connectors are arranged side by side in the circumferential direction of the stator, and the plate corresponds to the three connection portions respectively. The notch is formed at a position where the three notches are formed, and one of the three notches is formed between two adjacent connectors of the three connectors, and the circumferential direction of the three connectors is It is formed one each at a distance in the circumferential direction from the notch between the connector than the connector on the edge.

  According to this invention, the plate is formed with a notch penetrating in the axial direction of the rotating shaft and opening radially outward, and the end portion of the winding inserted through the notch is connected to the connecting portion. . With this configuration, the end of the winding can be inserted into the notch from the outside in the radial direction of the plate and connected (connected) to the connection of the terminal. Even if the notch is not accurately formed, the end can be easily connected to the terminal. Moreover, since the notch of the plate is formed so as to open outward in the radial direction, movement to the inside of the winding is restricted, and a short circuit between the end of the winding and the rotor can be prevented. Further, the end portion of the winding penetrates in the axial direction of the rotating shaft and is locked in the circumferential direction in the notch, so that it is stably held. For this reason, the vibration of the terminal which arises by rotation of a rotor can be suppressed.

  According to a second aspect of the present invention, in the stator according to the first aspect, a crossover is passed between the windings wound around the teeth, and the plate extends along the circumferential direction of the stator. Thus, a substantially arc shape is formed, and a recess for accommodating the crossover is formed.

According to a third aspect of the present invention, in the stator according to the first or second aspect, an engagement piece that engages with the stator is formed on the plate.
The invention according to claim 4 includes the stator according to any one of claims 1 to 3 and a rotor having a field magnet.

  According to the present invention, the end of the winding can be easily connected to the terminal.

(A) of the brushless motor in this Embodiment is a top view, (b) is the sectional view on the AA line of (a). (A) of the stator in this Embodiment is a top view, (b) is the BB sectional drawing of (a). (A) of the terminal and plate in this Embodiment is a top view, (b) is CC sectional view taken on the line of (a), (c) is DD sectional view taken on the line of (a). (A) of the connection part of the terminal in this Embodiment is a perspective view, (b) is the EE sectional view taken on the line of (a). (A) is a top view explaining the manufacturing process of the brushless motor in this Embodiment, (b) is the FF sectional view taken on the line of (a). (A) is a top view explaining the manufacturing process of the brushless motor in this Embodiment, (b) is the FF sectional view taken on the line of (a). (A) is a top view explaining the manufacturing process of the brushless motor in this Embodiment, (b) is the FF sectional view taken on the line of (a).

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIGS. 1 (a) and 1 (b), a brushless motor 1 includes a stator 3 fixed to the inner periphery of a substantially bottomed cylindrical housing 2, a rotor 4 accommodated inside the stator 3, A plate 5 covering the opening 2 a of the housing 2 and a metal terminal 6 fixed to the plate 5 are provided.

  As shown in FIGS. 1A and 1B and FIGS. 2A and 2B, the stator 3 has a plurality of (this embodiment) extending radially toward the center at predetermined angles (30 ° in the drawing). 12) teeth 7 are provided, and these teeth 7 are integrally configured with the outer peripheral side being connected by a connecting member. A bobbin 8 made of insulating resin formed in a cylindrical shape is inserted into each tooth 7, and a winding 9 is wound around each tooth 7 via the bobbin 8. The windings 9 wound around the teeth 7 include U-phase windings 9u and V-phases corresponding to three-phase excitation currents (U-phase, V-phase, and W-phase) as drive power supplied to the brushless motor 1. The winding is 9v and the W-phase winding is 9w. In the present embodiment, the plate 5 is fixed with three terminals 6X each having a connector 6b capable of supplying power from the outside and a connection part 6a, and a terminal 6Y having three connection parts 6a. The end 9a of each winding 9 is connected to the connection 6a.

  The brushless motor 1 of the present embodiment is a surface magnet type synchronous motor (SPM) in which a magnet 10 is arranged on the outer peripheral surface of a rotor 4, and the rotor 4 includes windings 9 of each phase (U, V, W). When the three-phase driving power is supplied to the rotating shaft 11, the rotating shaft 11 and the rotating shaft 11 are integrally rotated. In the present embodiment, three-phase driving power generated by a PWM inverter (not shown) is supplied to the windings 9 of each phase via the terminal 6.

  Specifically, the U-phase winding 9u, the V-phase winding 9v, and the W-phase winding 9w are respectively wound around predetermined teeth 7, and the teeth 7 on the opposite side of 180 ° across the other phase windings. Are wound continuously by one. That is, the crossover wire 9b is passed to each of the two teeth 7 that are opposed to each other across the center, and the winding 9 is wound by one coil. In the present embodiment, the U-phase winding 9u, the V-phase winding 9v, and the W-phase winding 9w are wound around two predetermined adjacent teeth 7 and teeth 7 corresponding to the other phases are provided. It is wound around two teeth 7 on the opposite side of 180 °.

  Of the two teeth 7 facing each other, the end 9a of the winding 9 wound around one of the teeth 7 is connected to the terminal 6X, and the end 9a of the winding 9 wound around the other tooth 7 is connected. Is connected to the terminal 6Y. By being connected in this way, the U-phase winding 9u, the V-phase winding 9v, and the W-phase winding 9w can be supplied with power from the connector 6b, respectively, and a neutral point is formed at the terminal 6Y. It is configured as follows.

  The stator 3 has a drawing position 3X for drawing the end 9a of the winding 9 installed on the terminal 6X side and a drawing position 3Y for drawing the end 9a of the winding 9 installed on the terminal 6Y side. Three locations are set. These drawing positions 3X and 3Y are set as positions where the end portions 9a of the respective windings 9 are drawn to the side of the plate 5 opposite to the rotor 4.

  Specifically, the starting end portion 9s of the U-phase winding 9u arranged on the terminal 6X side is drawn from the drawing position 3X indicated by a dotted line in the drawing, and the U-phase winding 9u arranged on the terminal 6Y side The end portion 9e is drawn from the drawing position 3Y indicated by a dotted line in the drawing. A connecting wire 9b is passed between the terminal end 9e of the U-phase winding 9u arranged on the terminal 6X side and the start end 9s of the U-phase winding 9u arranged on the terminal 6Y side.

  Similarly, the starting end portion 9s of the V-phase winding 9v arranged on the terminal 6X side is drawn from the drawing position 3X indicated by a dotted line in the drawing, and the terminal end portion of the V-phase winding 9v arranged on the terminal 6Y side. 9e is drawn from the drawing position 3Y indicated by a dotted line in the drawing. A connecting wire 9b is passed between the terminal end portion 9e of the V-phase winding 9v disposed on the terminal 6X side and the start end portion 9s of the V-phase winding 9v disposed on the terminal 6Y side.

  Similarly, the starting end 9s of the W-phase winding 9w arranged on the terminal 6X side is drawn from the drawing position 3X indicated by a dotted line in the figure, and the W-phase winding 9w arranged on the terminal 6Y side The end portion 9e is drawn from the drawing position 3Y indicated by a dotted line in the drawing. A connecting wire 9b is passed between the terminal end portion 9e of the W-phase winding 9w disposed on the terminal 6X side and the start end portion 9s of the W-phase winding 9w disposed on the terminal 6Y side.

  Each start end 9s, end end 9e, and crossover wire 9b are disposed on one side of the stator 3 (left side in FIG. 2B). The starting end portion 9s of the winding 9 disposed on the terminal 6X side and the terminal end portion 9e disposed on the terminal 6Y side are pulled out to the terminal 6 on the side opposite to the rotor 4 as the end portion 9a of the winding 9. Connected. Further, the connecting wire 9b passed between the winding 9 arranged on the terminal 6X side and the winding 9 arranged on the terminal 6Y side is accommodated in a recess 5a formed on the rotor 4 side of the plate 5. ing.

  The plate 5 has a substantially cylindrical shape having substantially the same diameter as the inner periphery of the stator 3. The plate 5 is formed with a plurality of (six in this embodiment) notches 5b penetrating in the axial direction of the rotating shaft 11 and opening radially outward, and corresponding to the notches 5b, the terminals 6 are respectively provided. The connecting portion 6a is disposed. Each notch 5b is formed along the radial direction, and is formed to have a width substantially the same as the diameter of the end 9a of the winding 9 in the circumferential direction. Moreover, each notch 5b is formed in the position corresponding to the extraction positions 3X and 3Y of the stator 3, and the end part 9a of the winding 9 inserted in each notch 5b is connected to the connection part 6a. In the present embodiment, the end portions 9a of the two windings 9 are inserted into each notch 5b.

  As shown in FIGS. 3A and 3B, a plurality of engagement pieces 5 c are formed on the surface of the plate 5 on the stator 3 side along the outer peripheral edge. The stator 3 is formed with a concave engagement portion (not shown) radially inward at a position corresponding to the engagement pieces 5c, and the plate 5 faces the stator 3 in the axial direction. When inserted, the plate 5 is configured to be locked and fixed to the stator 3. Since the engagement piece 5c is inserted into the engagement portion from the engagement direction, the engagement piece 5c is prevented from coming off in the radial direction by mounting the plate 5 on the housing 2 in a state of being fixed to the stator 3. . Therefore, the plate 5 is fixed without being detached from the housing 2 and the stator 3.

  Further, a substantially arc-shaped recess 5a is formed on the surface of the plate 5 on the side of the stator 3, and each of the crossover wires 9b is accommodated in the recess 5a as described above. The recess 5a is formed at an appropriate location so as to accommodate each crossover wire 9b. Further, on the surface of the plate 5 opposite to the stator 3, engaging portions 5d are formed to project at a plurality of locations, and the respective terminals 6 are engaged with the engaging portions 5d as described later.

  Each connecting portion 6a of the terminal 6 opens radially outward in the plate 5 and is formed so as to follow the shape of the inner peripheral side of the notch 5b, and is continuous with the notch 5b in the axial direction of the rotary shaft 11. It is arranged. More specifically, in the present embodiment, the connection portion 6a includes a terminal main body portion 6c and a presser portion 6d extending in the radial direction, and the connection portion 6a of the terminal main body portion 6c and the presser portion 6d is substantially U-shaped. It is connected so as to open outward in the radial direction. The terminal main body portion 6c and the pressing portion 6d are set such that the distance between the opposing surfaces sandwiches the end portion 9a of the winding 9. In the connection portion 6 a, the opposing surfaces of the terminal main body portion 6 c and the pressing portion 6 d and the surface that forms the notch 5 b in the plate 5 and opposes in the circumferential direction are substantially the same in the axial direction of the rotating shaft 11. It arrange | positions so that it may become on a plane. Further, the connection portion 6a has the center of the inner surface of the connecting portion between the terminal main body portion 6c and the pressing portion 6d substantially the same line along the axial direction with the center of the arcuate side surface at the radially inner end of the notch 5b. It is arranged to be.

  The terminal 6 protrudes toward the plate 5 and has a fixed piece 6e bent. The fixed piece 6e is embedded in the plate 5 and the terminal 6X is fixed to the plate 5. Similarly, a fixed piece 6e is formed in the terminal 6Y. The fixed piece 6e is embedded in the plate 5 and the terminal 6Y is fixed to the plate 5.

  As shown in FIG. 3C, a cut-and-raised portion 6f is formed in the terminal 6Y at a position corresponding to the engaging portion 5d formed on the plate 5. By engaging the cut-and-raised portion 6f with the engaging portion 5d, the movement of the terminal 6Y in the direction of detachment from the plate 5 is restricted, and the terminal 6Y is fixed to the plate 5. Similarly, a cut-and-raised portion 6f is formed at a position corresponding to the engaging portion 5d of the terminal 6X, and the terminal 6X is fixed to the plate 5. In addition, the connection part 6a provided in each terminal 6X, 6Y is arrange | positioned on the substantially concentric circle in the state which the terminal 6X, 6Y was fixed to the plate 5 (refer Fig.1 (a)).

  Further, as shown in FIGS. 4A and 4B, each connecting portion 6a is integrally provided with a protruding portion 6g as a restricting portion for restricting movement of the end 9a of the winding 9 to the opening side. Is formed. The projecting portion 6g is formed by projecting the presser portion 6d toward the inner side of the connection portion 6a (terminal main body portion 6c side). The protruding portion 6g is formed at a position where the end portions 9a of the two windings 9 are positioned in the radial direction in the connection portion 6a, and has an elasticity that allows the end portions 9a to be assembled. In the brushless motor 1, the end portion 9a of the winding 9 is connected to the connection portion 6a by arc or resistance welding.

Next, a method for manufacturing the brushless motor 1 will be described.
First, in the drawing step, as shown in FIGS. 5A and 5B, the end 9a drawn in the axial direction of the winding 9 is bent outward in the radial direction.

  Next, in the installation process, the plate 5 is installed on the stator 3 as shown in FIGS. Specifically, the plate 5 is installed by inserting the engagement piece 5c into a predetermined engagement portion (not shown) formed in the stator 3 from the radial direction. At this time, the end portions 9a of the windings 9 are positioned in the vicinity of the corresponding notches 5b. Since each notch 5b is formed so as to open radially outward in the plate 5, the corresponding notch is moved while being moved along the outer edge of the plate 5 with the end portion 9a of the winding 9 being pulled out in the axial direction. 5b can be inserted. For this reason, the end portion 9a of the winding 9 can be easily inserted into the plate 5 as compared with a case where the end portion 9a of the winding 9 is inserted into a hole having substantially the same shape as the section of the end portion 9a of the winding 9, for example.

  Next, in the insertion step, as shown in FIGS. 7A and 7B, the end 9a of the winding 9 is inserted into the notch 5b formed in the plate 5 from the radially outer side toward the inner peripheral side. The Then, the end portions 9a of the two windings 9 are locked and held by the connection portion 6a. That is, in the present embodiment, the end portions 9a of the two windings 9 are sandwiched between the terminal main body portion 6c and the pressing portion 6d in the circumferential direction, and are moved to the opening side (radially outward) by the protruding portion 6g. Therefore, it is held in a stable state. In the present embodiment, the notch 5b and the connecting portion 6a are formed along the radial direction. Therefore, when the end portion 9a of the winding 9 is inserted into the inner peripheral side, the end portion 9a is notched to the notch 5b. And it is guided to the connection part 6a, moves smoothly to the inner peripheral side, and is held by the connection part 6a. In addition, although the end part 9a of the two coil | windings 9 is inserted in the connection part 6a, in FIG.7 (b), only one is shown.

  Next, in the connecting step, the end 9a of the winding 9 is connected to the connecting portion 6a. As shown in FIGS. 4A and 4B, the end 9 a of the winding 9 is configured such that the periphery of the metal wire 12 is covered with a coating material 13 made of resin. As described above, arc or resistance welding is performed while being pressed from both sides in the circumferential direction with the end portion 9a held by the connection portion 6a, whereby the end portion 9a is connected and fixed to the connection portion 6a.

  In addition, since the connection part 6a provided in each terminal 6 is arrange | positioned on a substantially concentric circle in the plate 5, when performing arc or resistance welding to the connection part 6a of each terminal 6, work is easily shortened. Can be done in time. That is, in the brushless motor 1, an electrode (not shown) for performing arc or resistance welding can be easily aligned in a short time, and the working time can be shortened.

Thereafter, the stator 3 fitted with the plate 5 is housed and fixed in the housing 2 to manufacture the brushless motor 1.
Next, the characteristic operation effect of the brushless motor 1 in this embodiment will be described.

  (1) In the brushless motor 1, a notch 5b that penetrates the plate 5 in the axial direction of the rotary shaft 11 and opens radially outward is formed, and the end 9a of the winding 9 inserted through the notch 5b is connected. It is connected to the part 6a. Since the notch 5b is opened radially outward, the end 9a of the winding 9 can be inserted into the notch 5b from the radially outer side of the plate 5 and connected (connected) to the connecting part 6a of the terminal 6. Thus, the end 9a can be easily connected to the terminal 6 without forming the notch 5b with high precision at the position of the end 9a of the winding 9 in the rotor 4. Further, since the notch 5b of the plate 5 is formed so as to open outward in the radial direction, movement to the inside of the winding 9 is restricted, and a short circuit between the end 9a of the winding 9 and the rotor 4 is prevented. be able to. In addition, the end 9a of the winding 9 penetrates in the axial direction of the rotary shaft 11 and is locked in the circumferential direction in the notch 5b, and thus is stably held. For this reason, the vibration of the terminal 6 caused by the rotation of the rotor 4 can be suppressed.

  (2) Since the connecting portion 6a is formed so as to open radially outward and to be continuous with the notch 5b in the axial direction, the end portion 9a of the winding 9 inserted into the notch 5b from the radially outer side can be easily connected. It can be inserted and connected to the part 6a. For example, when the notch 5b and the connection portion 6a are not continuous in the axial direction, an operation of inserting the end portion 9a into the notch 5b and an operation of inserting the end portion 9a into the connection portion 6a are required. The part 9a can be inserted into the connection part 6a only by inserting the part 9a from the outside in the radial direction.

  (3) The end 9a of the winding 9 is held by a notch 5b and a connecting part 6a formed so as to be continuous in the axial direction of the rotary shaft 11, and the inner peripheral surface of the notch 5b and the terminal body from both sides in the circumferential direction. Since it is held by the portion 6c and the presser portion 6d, it is stably held in the circumferential direction. For this reason, the vibration of the terminal 6 caused by the rotation of the brushless motor 1 can be suppressed.

  (4) The end 9a of the winding 9 is sandwiched and connected between the terminal body 6c and the presser 6d from both sides in the circumferential direction. For this reason, when work such as resistance welding is performed to connect the end 9a of the winding 9 to the connection portion 6a, the electrode can be applied to the connection portion 6a from the circumferential direction without interference, and welding can be easily performed. Work can be done.

  (5) Since the protruding portion 6g for restricting the movement of the end portion 9a of the winding 9 to the opening side is integrally provided on the connection portion 6a, the end portion 9a of the winding 9 is formed by the protruding portion 6g. It is stably held by the connection part 6a. For this reason, the end portion 9 a of the winding 9 can be connected to the connection portion 6 a of the terminal 6 easily and reliably.

  (6) By forming the plurality of notches 5b at appropriate locations, the length of the end portion 9a of the winding 9 disposed in the housing 2 closed by the plate 5 can be shortened. For this reason, the space for accommodating the end portion 9a of the winding is reduced, and the brushless motor 1 can be shortened in the axial direction.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the connecting portion 6a of the terminal 6 is formed so as to open outward in the radial direction and to be continuous with the notch 5b of the plate 5 in the axial direction of the rotating shaft 11, but the connecting portion 6a It does not necessarily have to be continuous with the notch 5b in the axial direction. Since the notch 5b is formed in the plate 5, the end portion 9a of the winding 9 is easily pulled out to the side opposite to the rotor 4, so that the end portion 9a can be easily formed in any terminal. Can be connected.

  In the above embodiment, the connection portion 6a of the terminal 6 includes the terminal main body portion 6c extending along the radial direction and the presser portion 6d formed by bending the terminal main body portion 6c. The shape of 6a is not limited to this. In short, any shape that can connect the end 9a of the winding 9 may be used.

  In the above embodiment, the connecting portion 6a of the terminal 6 is integrally provided with the protruding portion 6g as a restricting portion that restricts the movement of the end portion 9a of the winding 9 to the opening side. You may form a control part how. For example, you may form so that it may extend along the axial direction of the rotating shaft 11. FIG. Further, the connecting portion 6a is not necessarily provided with a restricting portion.

-In above-mentioned embodiment, although the notch 5b shall be formed in the plate 5 at six places, the number of the notches formed in the plate 5 is not limited to this.
In the above embodiment, two end portions 9a of the winding 9 are connected to each connection portion 6a, but the number of windings 9 connected to the connection portion 6a is not limited to this, There may be one or three or more.

  In the above embodiment, the present invention is embodied in a surface magnet type synchronous motor (SPM), but any other brushless motor having a terminal such as a permanent magnet embedded synchronous motor (IPM) may be used. It may be embodied in a motor.

The technical idea that can be grasped from the above embodiment will be described below together with the effects thereof.
(A) The notch is formed along a radial direction. If comprised in this way, if the edge part of a coil | winding will be inserted from a radial direction outer side, it will be guide | induced to a radial inner side smoothly and will be hold | maintained reliably.

(B) a stator that is fixed to the inner periphery of the substantially bottomed cylindrical housing and includes a plurality of teeth provided to extend radially and a winding wound around each tooth;
A rotating shaft and a magnet fixed to the rotating shaft and disposed inside the stator, and a rotor that rotates relative to the stator when the winding is energized;
A plate covering the opening of the housing;
A metal terminal fixed to the plate and having a connection portion for connecting the ends of the windings;
A brushless motor with
The plate is formed with a notch penetrating in the axial direction of the rotary shaft and opening radially outward, and an end portion of the winding inserted through the notch is connected to the connecting portion. Brushless motor.

  According to this invention, the plate is formed with a notch penetrating in the axial direction of the rotating shaft and opening radially outward, and the end portion of the winding inserted through the notch is connected to the connecting portion. . With this configuration, the end of the winding can be inserted into the notch from the outside in the radial direction of the plate and connected (connected) to the connection of the terminal. Even if the notch is not accurately formed, the end can be easily connected to the terminal. Moreover, since the notch of the plate is formed so as to open outward in the radial direction, movement to the inside of the winding is restricted, and a short circuit between the end of the winding and the rotor can be prevented. Further, the end portion of the winding penetrates in the axial direction of the rotating shaft and is locked in the circumferential direction in the notch, so that it is stably held. For this reason, the vibration of the terminal which arises by rotation of a rotor can be suppressed.

Note that the same effect is obtained in the invention of the manufacturing method described below.
(C) The connection portion is formed to open radially outward and to be continuous with the notch in the axial direction.

  According to the present invention, since the connecting portion is formed so as to open radially outward and to be continuous with the notch in the axial direction, the end of the winding inserted into the notch from the radially outer side can be easily inserted into the connecting portion. Can be connected. Further, since the end portion of the winding is continuously held by the notch and the connecting portion in the axial direction of the rotating shaft, it is stably held in the rotating direction of the rotating shaft. For this reason, the vibration of the terminal which arises by rotation of a rotor can be suppressed.

  (D) The connection portion includes a terminal main body portion extending along the radial direction, and a pressing portion extending along the radial direction formed by bending the terminal main body portion so as to sandwich the end portion of the winding. It is characterized by that.

  According to this invention, the connection part has a terminal body part extending along the radial direction and a pressing part extending along the radial direction formed by bending the terminal body part so as to sandwich the end of the winding. For this reason, since the end of the winding is held in the notch and held between the terminal main body portion and the holding portion of the connection portion from both sides in the circumferential direction, the vibration of the terminal caused by the rotation of the motor is suppressed. be able to. In addition, for example, when resistance welding is performed in order to connect the end of the winding to the connection portion, the electrode can be applied to the connection portion from the circumferential direction where there is no interference, so that the welding operation can be easily performed. it can.

(E) The connecting portion is integrally provided with a restricting portion for restricting movement of the end portion toward the opening side.
According to this invention, since the restricting portion for restricting the movement of the end portion of the winding to the opening portion is integrally provided in the connection portion, the end portion of the winding is provided by the restricting portion provided in the connection portion. Is held stably. For this reason, the end portion of the winding can be connected to the connection portion of the terminal easily and reliably.

(F) The plate is characterized in that the notches are formed at a plurality of locations in the circumferential direction, and the connecting portions are disposed corresponding to the notches.
According to the present invention, the plate has notches formed in a plurality of locations in the circumferential direction, and connection portions are disposed corresponding to the respective notches. It is possible to shorten the length of the end of the winding disposed in the closed housing. For this reason, the space for accommodating the winding end portion is reduced, and the brushless motor can be shortened in the axial direction.

(G) a stator that is fixed to the inner periphery of the substantially bottomed cylindrical housing and includes a plurality of teeth provided so as to extend radially and a winding wound around each tooth;
A rotating shaft and a magnet fixed to the rotating shaft and disposed inside the stator, and a rotor that rotates relative to the stator when the winding is energized;
A notch that penetrates in the axial direction of the rotating shaft and opens to the outside in the radial direction is formed, and a plate that covers the opening of the housing;
A metal terminal fixed to the plate and having a connection portion for connecting the ends of the windings;
A method of manufacturing a brushless motor comprising:
A drawing step of bending the end of the winding toward the outside in the radial direction;
An installation step of installing the plate on the stator;
An insertion step of inserting an end of the winding from a radially outer side into a notch formed in the plate;
A connection step of connecting the end of the winding to the connection portion;
A method for manufacturing a brushless motor, comprising:

  DESCRIPTION OF SYMBOLS 1 ... Brushless motor, 2 ... Housing, 2a ... Opening part, 3 ... Stator, 4 ... Rotor, 5 ... Plate, 5b ... Notch, 6, 6X, 6Y ... Terminal, 6a ... Connection part, 6c ... Terminal main-body part, 6d DESCRIPTION OF SYMBOLS ... Pressing part, 6g ... Protruding part as a control part, 7 ... Teeth, 9 ... Winding, 9a ... End part, 10 ... Magnet, 11 ... Rotating shaft.

Claims (4)

A stator comprising a plurality of teeth extending radially with respect to the rotation shaft of the three-phase motor, windings wound around each tooth, and a plate being fixed,
The plate is formed with a notch penetrating in the axial direction of the rotating shaft and opening radially outward,
Three terminals, each having one connection portion to which the end of the winding inserted through the notch is connected, and one connector capable of supplying power from the outside are fixed to the plate, The connector is arranged side by side in the circumferential direction of the stator,
In the plate, the notches are formed at positions corresponding to the three connection portions, respectively, and the three notches are formed between two adjacent two connectors among the three connectors, The stator is characterized in that one of the three connectors is formed at a position away from the notch between the connectors in the circumferential direction, rather than connectors located at both ends in the circumferential direction. The stator according to claim 1,
A crossover is passed between the windings wound around the teeth,
A stator having a substantially arc shape along the circumferential direction of the stator and having a recess for accommodating the jumper wire is formed in the plate. The stator according to claim 1 or 2,
An engaging piece that engages with the stator is formed on the plate.   A brushless motor comprising the stator according to claim 1 and a rotor having a field magnet.

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