JP6615003B2 - Blower motor unit for air conditioning - Google Patents

Description

  The present invention relates to a blower motor unit of an air conditioner mounted on a vehicle such as an automobile and a method for manufacturing an air conditioner blower motor unit.

  For example, Patent Document 1 discloses a brushless motor including a circuit board on which a drive circuit is formed and a circuit board on which a control circuit board is formed. According to such a brushless motor, the circuit and the terminal pin (connection terminal) are electrically coupled by the driving bus bar. Furthermore, the end of the coil of the motor body is also connected to the terminal pin, thereby electrically connecting the circuit and the brushless motor body.

Japanese Unexamined Patent Publication No. 2000-4466

  Incidentally, the brushless motor disclosed in Patent Document 1 includes connection terminals on both the circuit board and the coil of the motor body. Further, since vibration is generated when the brushless motor is driven, the bus bar provided on the substrate of the brushless motor disclosed in Patent Document 1 has a vibration-proof structure. For this reason, the circuit board and the motor main body of the brushless motor disclosed in Patent Document 1 have a large number of parts and a complicated structure, and thus are not easy to manufacture.

  The present invention has been made in view of the above-described problems, and aims to simplify the structure of the motor unit without requiring an anti-vibration structure at the connection portion between the circuit board of the air-conditioning blower motor unit and the motor. To do.

  In order to achieve the above object, in the present invention, as a first means related to an air conditioning blower motor unit, an air conditioning blower motor unit including a brushless motor and a circuit board for driving the brushless motor, the brushless motor is provided. The circuit board includes a connection terminal to which an end portion of the winding is directly connected.

  In the present invention, as the second means related to the air-conditioning blower motor unit, in the first means, the brushless motor includes a stator having an insulating member, and the winding holding portion is integrated with the insulating member. The configuration of being provided is adopted.

  In the present invention, as a third means related to the air conditioning blower motor unit, the insulating member is formed with a ventilation opening, and the winding holding part protrudes in a bowl shape from a portion adjacent to the ventilation opening. Is adopted.

  In the present invention, as the fourth means related to the air-conditioning blower motor unit, in any one of the above means 1 to 3, the circuit board includes a notch, and the connection terminal is disposed in the notch. The configuration is adopted.

  In the present invention, as a fifth means related to the air-conditioning blower motor unit, the brushless motor and the circuit board are provided with a frame member mounted on the front and back, and the frame member is disposed corresponding to the notch portion. A configuration is adopted in which a frame opening that faces the connection terminal and the winding holding part is provided.

  In the present invention, as a first means related to a method for manufacturing an air-conditioning blower motor unit, there is provided a method for manufacturing an air-conditioning blower motor unit comprising a brushless motor and a circuit board for driving the brushless motor, which is insulated from a stator core. An insulator mounting step of mounting a member and installing a winding holding portion; and winding the winding around the stator core on which the insulating member is mounted and tensioning the winding to the winding holding portion A winding winding step, a circuit board mounting step for positioning the circuit board with respect to the stator core and aligning an end of the winding with a connection terminal provided on the circuit board; and the circuit A configuration is employed in which a connection step is provided for directly connecting the connection terminal provided on the substrate and the end of the winding.

  In the present invention, as a second means related to a method for manufacturing an air conditioning blower motor unit, in the first means, the air conditioning blower motor unit includes a frame member housed in a casing, and in the circuit board mounting step, When the circuit board is screwed to the frame member, the end of the winding extending to the other side of the frame member is aligned with a connection terminal provided on the circuit board, and the circuit It is performed prior to the board mounting step, and the stator having the winding wound around the stator core is fitted on one side of the frame member and the end of the winding is placed on the other side of the frame member. The structure of having a base frame mounting process to be extended is adopted.

  The motor unit according to the present invention includes a winding holding portion that holds the winding. For this reason, it is possible to loosen the winding ahead of the winding holding portion while maintaining the tension state of the winding on the motor body side. Therefore, when the tip portion of the winding ahead of the winding holding portion is directly connected to the connection terminal of the circuit board, vibration can be absorbed by the slack of the tip portion. Therefore, according to the present invention, it is not necessary to separately provide an anti-vibration structure at the connection portion between the circuit board and the motor body, and the structure of the motor unit can be simplified.

It is a side view of the air blower provided with the motor unit which concerns on one Embodiment of this invention. It is a perspective view of a motor unit concerning one embodiment of the present invention. It is sectional drawing of the motor unit which concerns on one Embodiment of this invention. It is a figure which shows the internal structure of the motor unit which concerns on this embodiment, (a) is the bottom view which abbreviate | omitted the lower casing part, (b) is the top view which abbreviate | omitted the upper casing part. It is a disassembled perspective view containing a part of motor and base frame in one Embodiment of this invention. It is the elements on larger scale of the lower insulator in one Embodiment of this invention. It is a perspective view which shows the winding direction of the coil | winding in one Embodiment of this invention. It is the elements on larger scale containing the connection terminal with which the circuit board in one Embodiment of this invention is provided. FIG. 4 is an enlarged view including a constricted winding and a bus bar in an embodiment of the present invention. It is a flowchart which shows the manufacturing method of the motor unit which concerns on one Embodiment of this invention.

  Hereinafter, an embodiment of a blower motor unit 1 (air-conditioning blower motor unit) according to the present invention will be described with reference to the drawings.

The blower A is disposed in the middle of a duct constituting the vehicle air conditioner. Such a blower A includes a blower motor unit 1, a blower fan B, and a fan case C that houses the blower fan B. The blower fan B is a centrifugal fan having a large number of blades on the outer periphery. The blower fan B is rotated by the blower motor unit 1, thereby sucking air from an air suction port C <b> 1 formed in the fan case C and blowing it through an air delivery port (not shown). The fan case C is attached to the blower motor unit 1 via a bracket D. Although not shown, air-conditioning equipment such as an evaporator that cools the air and a heater core that heats the air is disposed on the downstream side in the blowing direction of the air blown from the blower fan B.
In the following description, the side where the blower fan B is attached to the blower motor unit 1 is described as the upper side.

  The blower motor unit 1 is an air conditioning blower motor unit provided in the blower A. As shown in FIGS. 2 and 3, the casing 2, the base frame 3 (frame member), the motor 4, the circuit board 5, the heat radiating member 6, and the elasticity A member 7 is provided. The casing 2 includes a casing portion 20 that houses the base frame 3, the motor 4, the circuit board 5, the heat radiating member 6, and the elastic member 7, and a gas guide portion 21. The casing part 20 and the gas guide part 21 are integrally configured by combining the upper casing part 2A and the lower casing part 2B which are divided into two parts in the vertical direction on the peripheral surface part 20b. The upper casing portion 2A is an upper member including an upper surface portion 20a and an introduction opening portion 21a described later, and the lower casing portion 2B is a lower member including a bottom surface portion 20c described later.

  The casing part 20 is a flat, substantially cylindrical container-like part having an upper surface part 20a, a peripheral surface part 20b, and a substantially circular bottom surface part 20c. The casing portion 20 includes a central opening portion 20d opened on the upper surface portion 20a, a heat radiating member exposed opening portion 20e, a projection portion 20f provided on the upper surface portion 20a, and a guide wall portion 20g provided on the bottom surface portion 20c. (See FIG. 4).

  The central opening 20d is an opening formed in the central portion of the motor 4 in which the motor 4 is accommodated and the inner side of the casing 2 and the inner side of the fan case C in which the blower fan B is accommodated. That is, the central opening 20d exposes the motor 4 to the fan case C side. The heat radiating member exposed opening 20e can swing the upper end 60 of the heat radiating member 6 formed at a position corresponding to the heat radiating member 6 disposed approximately in the middle between the output shaft 42 of the upper surface portion 20a and the introduction opening 21a. It is an opening that fits loosely in The heat radiating member exposure opening 20e is provided to expose the upper end portion 60 of the heat radiating member 6 to the outside of the casing 2 so as to be exposed to the fan case C side.

  The protruding portion 20f is a cylindrical portion that is formed to protrude from the upper surface portion 20a of the upper casing portion 2A downward (inside the casing 2) at a plurality of locations (three locations). As shown in FIG. 4, the guide wall portion 20 g is a standing wall portion that is raised from the bottom surface portion 20 c of the lower casing portion 2 </ b> B, and has a tapered shape at a position opposite to the gas guide portion 21, and is tapered. Form a surface. The guide wall portion 20g flows in from the introduction opening portion 21a and guides the flow of air that has passed under the output shaft 42 along the lower casing portion 2B to the central opening portion 20d, as will be described later.

  As shown in FIG. 1, the gas guide portion 21 is an air conduction path that opens toward the upper side of the casing 2, and communicates the downstream side in the air blowing direction of the fan case C and the inside of the casing 2.

  The base frame 3 includes a plurality of fitting openings 30 into which the elastic member 7 is recessed, a motor holding portion 31 that holds the motor 4 via a connection member 43 described later, and a heat dissipation that supports the heat dissipation member 6. A holding member having a member fixing portion 32. The base frame 3 further includes a circuit board fixing portion 35 that fixes the circuit board 5. Such a base frame 3 is elastically supported by the upper casing portion 2A by fitting a plurality of elastic members 7 to the protruding portions 20f.

  Further, a predetermined gap is provided between the heat radiation member exposed opening 20e of the base frame 3 and the outer peripheral edge of the upper end 60 of the heat radiation member 6, and a frame-like elastic member is provided in the gap. The member 7a is clamped. Thus, the base frame 3 is elastically supported (floating) by inserting the plurality of elastic members 7 and 7 a inside the casing 2. The elastic member 7 is fixed to the upper casing portion 2A by a fastening member such as a screw, and does not fall off from the protruding portion 20f.

  As shown in FIGS. 4 and 5, the motor 4 and the heat radiating member 6 are attached to a surface (hereinafter referred to as a surface) on the upper casing portion 2 </ b> A side of the base frame 3. It is attached to the surface (hereinafter referred to as the back surface) on the lower casing portion 2B side. The motor holding portion 31 is a circularly recessed portion along the shape of the motor 4 attached to the surface, and an output shaft opening 31a through which the output shaft is inserted at the center of the circularly recessed portion, and a frame opening A portion 33 (33a, 33b) and a lower ball bearing holding portion 34 are formed.

  The frame opening 33 has a semicircular range corresponding to a slot position of a board side opening 33a formed at a position corresponding to a notch 50 of the circuit board 5 to be described later and a tooth part 40f of the motor 4 to be described later. And a motor side opening 33b which is a plurality of fan-shaped openings arranged in a row. The substrate side opening 33a and the motor side opening 33b are configured such that the air flow introduced between the lower casing part 2B and the base frame 3 from the introduction opening 21a enters the central opening 20d of the upper casing part 2A. It is provided so as not to hinder heading. The lower ball bearing holding portion 34 is a cylindrical bearing boss formed on the back surface of the motor holding portion 31 and around the output shaft opening portion 31 a, and above the lower ball bearing holding portion 34. The connection member 43 (see FIG. 3) is fixed.

  As shown in FIG. 3, the connection member 43 includes a lower ball bearing 43c, an upper ball bearing 43b, and a sleeve member 43a, which are slidably held in the direction of the output shaft 42 by the lower ball bearing holding portion 34 described above. And have. The sleeve member 43a is an annular member that is provided between the stator core 40a and the upper ball bearing 43b and fixes the upper ball bearing 43b to the stator core 40a. The sleeve member 43 a is fixed to the upper surface side of the lower ball bearing holding portion 34 of the base frame 3 while the output shaft 42 is inserted through the central opening in a non-contact manner.

  In the upper ball bearing 43b, the output shaft 42 is press-fitted and fixed to the inner ring portion of the ball bearing, and the sleeve member 43a is fitted and fixed to the outer ring portion of the upper ball bearing 43b. The output shaft 42 is rotatably supported. In the lower ball bearing 43c, the output shaft 42 is press-fitted and fixed to the inner ring portion, and the outer ring portion is inserted into the lower ball bearing holding portion 34 of the base frame 3 so as to be slidable in the direction of the output shaft 42. 42 is rotatably supported. In such a connection member 43, the upper ball bearing 43 b and the lower ball bearing 43 c are energized between the outer ring of the lower ball bearing 43 c and the lower ball bearing holding portion 34 to bias each ball. A wave washer 43d is interposed in order to apply a predetermined pressure to the bearing.

  The motor 4 is a three-phase AC brushless motor that is pivotally supported by the base frame 3 via a connection member 43. The motor 4 includes a stator 40, a rotor 41, and an output shaft 42. The stator 40 of the motor 4 includes a stator core 40a, an upper insulator 40b, a lower insulator 40c, and a winding 40d. Furthermore, the stator core 40a includes a yoke portion 40e and a teeth portion 40f. The yoke portion 40e is an annular member, and the sleeve member 43a is press-fitted and fixed inside. Thereby, the stator 40 is fixed to the base frame 3. The yoke portion 40e has a plurality of yoke openings 40g. The teeth portion 40f is formed so as to project radially from the outer periphery of the yoke portion 40e in a direction perpendicular to the output shaft 42, and a plurality of field portions for generating a rotating magnetic field in the circumferential direction around the output shaft 42 It is. In the present embodiment, a configuration in which the tooth portion 40f has 15 slots is illustrated.

  The upper insulator 40b and the lower insulator 40c are resin insulating members provided so as to cover the surface of the stator core 40a. When the upper insulator 40b and the lower insulator 40c sandwich the stator core 40a from the vertical axis direction, the winding 40d and the stator core 40a are insulated. The winding 40d is wound around the tooth portion 40f a plurality of times with the upper insulator 40b and the lower insulator 40c interposed therebetween. The winding 40d is a thin metal wire (copper wire) whose surface is covered with an insulating coating layer such as enamel. The upper insulator 40b is formed with an upper insulator opening 40h (ventilation opening) at a position overlapping the yoke opening 40g of the yoke 40e. Similarly, the lower insulator 40c has a lower insulator opening 40k (ventilation opening) at a position overlapping the yoke opening 40g. Accordingly, the yoke opening 40g, the upper insulator opening 40h, and the lower insulator opening 40k are arranged so as to overlap each other, thereby forming a gas flow path 4A inside the motor 4 as shown in FIG. Is done.

  As shown in FIG. 6, the lower insulator 40c includes a winding holding portion 40m adjacent to the lower insulator opening 40k. The winding holding portions 40m are provided at three positions in the vicinity of the circuit board 5 of the lower insulator 40c. The winding holding portion 40m has a vertical portion 40m1 protruding in a direction parallel to the output shaft 42, and a winding winding portion 40m2 protruding vertically radially inward from the vertical portion 40m1. That is, such a winding holding part 40m is a part protruding like a bowl.

  As shown in FIG. 7, the winding 40d is three metal thin wires wound around the tooth portion 40f by so-called three-phase delta connection, and the surface is covered with an insulating material. Ends 40d1, which are ends on the winding end side of the winding 40d, are each wound around the winding holding part 40m and then extended through a board-side opening 33a of the base frame 3 to be described later. To the bus bar 51 (connection terminal). As described above, the winding 40d wound around the tooth portion 40f is held in a tension state without being loosened by being wound around the winding holding portion 40m before the winding 40d is connected to the circuit board 5. It becomes possible. Further, when viewed from the tooth portion 40f side, the portion of the winding 40d exceeding the winding holding portion 40m (hereinafter referred to as the tip portion 40d2) is pulled out in the axial direction of the stator 40 and is in a tension state. It has been eased. That is, the tension of the winding 40d in the portion of the tip portion 40d2 is in a relaxed state than the tension of the portion wound around the tooth portion 40f.

  The rotor 41 is a rotating member (outer rotor) outside the stator that is externally fitted to and connected to the output shaft 42 on the upper side of the stator 40 and is rotatably provided around the stator 40. As shown in FIG. 5, the rotor 41 is arranged so that a circular upper surface portion 41 c and a peripheral surface portion 41 d are formed, and an inner surface of the peripheral surface portion 41 d is opposed to the stator 40. A plurality of magnets 41b are provided. The frame portion 41a has an output shaft fixing portion 41e to which the output shaft 42 is inserted and fixed at the center of the upper surface portion 41c. The frame portion 41a has a plurality of fan-shaped rotor openings 41f formed around the output shaft fixing portion 41e. The magnets 41b are arranged in a plurality of rows on the inner side of the peripheral surface portion 41d of the frame portion 41a so as to constitute a plurality of magnetic poles facing each other through a predetermined gap in the outer circumferential direction of the stator core 40a. In the present embodiment, the configuration of 14 magnets 14b (14 poles) is illustrated. The circular upper surface portion 41c of the rotor 41 is exposed from the central opening 20d of the upper casing portion 2A.

  The circuit board 5 has a substantially semicircular shape as shown in FIG. 4, and is fixed to the circuit board fixing portion 35 of the base frame 3 with a plurality of screw members. Further, as shown in FIG. 3, the circuit board 5 is supported by the base frame 3 to be separated from the casing 2 inside the casing 2. The circuit board 5 is disposed between the introduction opening 21 a of the casing 2 and the output shaft 42 of the motor 4 in the axial direction of the output shaft 42 of the motor 4. That is, the circuit board 5 is accommodated in the casing 2 and supported by the base frame 3 so as to be eccentric with respect to the output shaft 42.

  The circuit board 5 has a substantially semicircular shape as shown in FIG. As shown in FIG. 3, the circuit board 5 is supported by the base frame 3 so as to be separated from the casing 2 in the direction along the axis of the output shaft 42. Further, the circuit board 5 is arranged eccentrically with respect to the output shaft 42 of the motor 4 inside the casing 2. Thereby, the circuit board 5 is arrange | positioned in the streamline of the air which flows from the introduction opening part 21a to the center opening part 20d.

  The circuit board 5 includes a notch 50 and a bus bar 51 (connection terminal). The notch 50 is formed in a portion corresponding to the substrate side opening 33 a of the base frame 3 in the vicinity of the output shaft 42. The bus bar 51 is disposed adjacent to the notch 50, and has three connection recesses 51a corresponding to the three-phase wiring of the motor 4 as shown in FIG. As shown in FIG. 9, the tip portion 40d2 of the winding 40d drawn from the motor 4 is narrowly pressed by the connection recess 51a, whereby the motor 4 and the circuit board 5 are electrically connected. That is, the connection recess 51a and the tip portion 40d2 of the winding 40d are directly connected.

  Such a circuit board 5 includes a drive circuit including a switching element for supplying a PWM-controlled drive current to the motor, and a control circuit connected to the switching element and supplying a control signal to the switching element. Is arranged. The rotor 41 is rotated by the magnet 41b of the rotor 41 being attracted by the rotating magnetic field of the stator core 40a and the winding 40d generated based on such an instruction from the circuit board 5. The control circuit is a sensorless control system that does not require a rotation detection sensor. Thereby, the circuit board 5 does not need to include a rotation angle detector for detecting the rotation angle state of the output shaft 42 in the vicinity of the output shaft 42, and therefore the notch 50 can be easily provided in the vicinity of the output shaft 42. Can be formed.

  By the way, the circuit board 5 is formed with an upper heat conduction surface (thermal pad) adjacent to the lower end side of the heat radiating member 6 exposed on the back surface side of the base frame 3 so as to be able to conduct heat. In addition, a lower heat conduction surface (thermal land) on which electronic parts having a large amount of heat generation such as a switching element of a drive circuit are mounted is formed on the surface opposite to the upper heat conduction surface. The surface and the lower heat conducting surface are connected by heat conducting means (not shown) such as a thermal through hole. Thereby, the heat radiating member 6 can efficiently discharge the heat of the circuit board 5 to the outside of the blower motor unit 1. In addition, between the lower end side of the thermal radiation member 6 and an upper side heat conductive surface, heat conductive grease or a sheet-like heat conductive member may be pinched | interposed. In this case, the heat of the circuit board 5 can be discharged to the outside of the blower motor unit 1 more efficiently.

Then, the manufacturing method of such a blower motor unit 1 is demonstrated based on FIG.
First, an insulator mounting process is performed (step S1). In step S1, an upper insulator 40b and a lower insulator 40c are mounted on a stator core 40a which is created by press punching and laminating from a magnetic steel sheet as a raw material and in which a sleeve member 43a is press-fitted and fixed. As described above, the winding holding portion 40m is integrally formed with the lower insulator 40c. Therefore, when the upper insulator 40b and the lower insulator 40c are attached to the stator core 40a, the insulation of the stator core 40a and the installation of the winding holding portion 40m are performed all at once.

  Next, a winding winding process is performed (step S2). In step S2, the stator 40 is formed by winding the three windings 40d around the teeth 40f covered by the upper insulator 40b and the lower insulator 40c. Note that the winding 40d is connected by so-called three-phase delta connection, thereby reducing the number of crossovers for connecting the three-phase U, V, and W phases to the neutral point. Is possible. The end portion 40d1 of the winding 40d wound around the tooth portion 40f is wound at least once around the winding holding portion 40m of the lower insulator 40c and extends below the stator 40. As a result, the winding 40d wound around the tooth portion 40f is held in a tension state, and the tip portion 40d2 of the winding 40d exceeding the winding holding portion 40m is pulled out downward in the axial direction, so that the tip portion 40d2 portion The tension of the winding 40d can be set to be more relaxed than the tension of the portion wound around the tooth portion 40f.

  Next, an output shaft attachment process is performed (step S3). In step S3, first, the outer ring portion of the upper ball bearing 43b is press-fitted and fixed to the sleeve member 43a press-fitted and fixed to the stator core 40a. Next, the output shaft 42 is press-fitted and fixed to the inner ring portion of the upper ball bearing 43b.

  Subsequently, a base frame mounting step is performed (step S4). In step S4, first, the distal end portion 40d2 of 40d is inserted into the substrate side opening 33a of the base frame 3, and at the same time, the lower end side of the output shaft 42 is inserted into the output shaft opening 31a of the base frame 3 so that each It is pulled out below the frame 3. Next, the base frame 3 and the sleeve member 43a are fitted. Subsequently, the wave washer 42d is interposed in the lower ball bearing holding portion 34 of the base frame 3 through the output shaft 42, and the inner ring portion of the lower ball bearing 43c is inserted from the lower end side of the output shaft 42, The output shaft 42 is press-fitted and fixed. Accordingly, the lower ball bearing 43c is fitted inside the lower ball bearing holding portion 34. A predetermined bearing pressure is applied to the upper ball bearing 43b and the lower ball bearing 43c by the extension tension of the wave washer 43d interposed in this manner. It can be adjusted to some extent (as the pre-compression amount of the wave washer 43d) by changing the press-fitting and fixing position of the inner ring portion of the bearing 43c to the output shaft 42. Furthermore, the rotor 41 is externally fitted to the output shaft 42 and connected to the upper side of the stator 40.

  Next, a circuit board attachment process is performed (step S5). In step S <b> 5, the circuit board 5 is screwed and fixed to the circuit board fixing part 35 of the base frame 3 so that the notch 50 of the circuit board 5 is aligned with the board-side opening 33 a of the base frame 3. In addition, alignment of the tip portion 40d2 of the three-phase winding 40d extending below the stator 40 and the three connection recesses 51a of the bus bar 51 is performed. At this time, since the winding 40d is wound around the winding holding portion 40m, the winding 40d wound around the tooth portion 40f is loosened even when the winding 40d is not yet fixed to the bus bar 51. There is nothing. Further, the heat radiating member 6 is inserted into and fixed to the heat radiating member fixing portion 32 of the base frame 3 of the circuit board 5.

  Subsequently, a direct connection process is performed (step S6). In step S6, as shown in FIG. 9, the tip portion 40d2 of the winding 40d is sandwiched between the connection recesses 51a of the bus bar 51, and both sides of the connection recesses 51a are provided by a fusing tool (not shown) equipped with a welding power source. More pre-pressurization is performed. Further, the first stage energization process is performed by the fusing tool while applying pressure from both sides of the connection recess 51a. As a result, the tip portion 40d2 of the winding 40d is melted by the high temperature of the coating, and the bare metal is exposed and contacts the connection recess 51a. Further, a second-stage energization process is performed by the fusing tool. As a result, when the connection recess 51a is energized, the winding 40d is softened and welded (fused) to the connection recess 51a. Note that the winding 40d is configured so that the tension of the winding 40d at the tip portion 40d2 that exceeds the winding holding portion 40m when viewed from the tooth portion 40f side of the stator 40 is equal to the tension of the portion wound around the tooth portion 40f. Then, it is welded and fixed to the connection recess 51a of the bus bar 51 so as to be in a slack state.

  Finally, a casing mounting process is performed (step S7). In step S <b> 7, first, the elastic member 7 is inserted into the fitting opening 30 of the base frame 3. Further, a frame-shaped elastic member 7 a is fitted on the upper end portion 60 of the heat radiating member 6. Next, the three protruding portions 20f of the upper casing portion 2A are inserted through the three indented elastic members 7, respectively. At substantially the same time, the upper end portion 60 of the heat radiating member 6 on which the frame-like elastic member 7a is fitted is inserted into the heat radiating member exposed opening 20e of the upper casing portion 2A. Subsequently, the elastic member 7 is fixed to the upper casing portion 2A by screwing a screw into a screw hole provided in advance in the protruding portion 20f. Thereby, the base frame 3 to which the motor 4, the circuit board 5, and the heat radiating member 6 are fixed is elastically supported by the upper casing portion 2A. Further, the lower casing portion 2B is mounted from the lower side, the upper casing portion 2A and the lower casing portion 2B are fixed, and the operation is completed.

  According to the blower motor unit 1 according to the present embodiment as described above, the winding holding portion 40m and the connection concave portion 51a of the bus bar 51 to which the tip end portion 40d2 of the winding 40d is directly connected are provided. After being wound around the winding holding part 40m, it is directly connected to the connection recess 51a. Thereby, the winding 40d wound around the tooth portion 40f can loosen the tip end portion 40d2 while maintaining a tension state without being loosened during the assembly of the motor 4. Therefore, by connecting the tip portion 40d2 directly to the connection recess 51a of the circuit board 5, vibration can be absorbed by the slack of the tip portion 40d2. Therefore, according to the blower motor unit 1 according to the present embodiment, it is not necessary to separately provide an anti-vibration structure at the connection portion between the circuit board 5 and the motor 4, and the structure of the blower motor unit 1 can be simplified.

  Further, according to the blower motor unit 1 according to the present embodiment, the winding holding part 40m is integrally provided adjacent to the lower insulator opening 40k of the lower insulator 40c. Thereby, since a complicated process is not required for manufacture of the coil | winding holding | maintenance part 40m, shaping | molding of the lower insulator 40c becomes easy.

  Further, according to the blower motor unit 1 according to the present embodiment, the winding holding portion 40m includes the upright portion 40m1 that protrudes perpendicularly to the axial direction, and the winding winding that protrudes radially inward from the upright portion 40m1. 40m2, and protrudes in a bowl shape from a portion adjacent to the lower insulator opening 40k of the lower insulator 40c. Thus, the winding 40d drawn from the stator 40 can be drawn out in a direction parallel to the output shaft 42 from the stator 40 by being wound around the upright portion 40m1 or the winding winding portion 40m2. In addition, the winding holding portion 40m does not have a so-called unreasonable shape by being adjacent to the lower insulator opening 40k. Therefore, the resin-made lower insulator 40c provided with the winding holding part 40m can be easily formed by injection molding.

  Further, according to the blower motor unit 1 according to the present embodiment, the circuit board 5 includes the notch 50, and the connection recess 51 a of the bus bar 51 is disposed in the notch 50. Thereby, the front-end | tip part 40d2 of the coil | winding 40d and the connection recessed part 51a can be connected easily.

  The blower motor unit 1 according to the present embodiment includes a base frame 3 that holds the motor 4 and the circuit board 5 at once. Further, the base frame 3 includes a substrate side opening 33a that is opened corresponding to the notch 50 and that faces the connection recess 51a of the bus bar 51 and the winding holding part 40m. Thereby, the front-end | tip part 40d2 of the coil | winding 40d and the connection recessed part 51a can be connected easily. In addition, there are no obstacles around the winding 40d, and the tension of the winding 40d at the tip portion 40d2 of the stator 40 that exceeds the winding holding portion 40m when viewed from the teeth 40f side of the stator 40 is reduced. It becomes a state loosened compared with the tension of the portion wound around. Thereby, even if it is the structure which absorbs a vibration with the coil | winding 40d, the front-end | tip part 40d2 does not interfere with surrounding components.

  Further, according to the method for manufacturing the blower motor unit 1 according to the present embodiment, in the direct connection process (fixing operation) between the connection recess 51a and the end 40d1 of the winding 40d, there is no part that becomes an obstacle in the surroundings, and the operation is performed. Easy. Moreover, since the winding 40d is wound at least once around the winding holding portion 40m, the winding wound around the tooth portion 40f even when the winding 40d is not yet fixed to the bus bar 51. The line 40d does not sag. Therefore, the winding 40d can be fixed to the stator 40 before the circuit board 5 is attached. As a result, the blower motor unit 1 can be easily manufactured.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. For example, the following modifications can be considered.
(1) In the above embodiment, the winding holding part 40m is provided at three positions close to the circuit board 5, but the present invention is not limited to this. The winding holding part 40m can be easily formed by protruding from a portion adjacent to the lower insulator opening 40k of the lower insulator 40c. Therefore, a desired number of winding holding portions 40m may be added as appropriate according to the winding mode.

(2) In the above embodiment, the base frame 3 is elastically supported on the upper surface portion 20a of the casing 2 with the elastic members 7 and 7a interposed therebetween, but the present invention is not limited to this. The base frame 3 may be directly fixed to the upper surface portion 20a or the bottom surface portion 20c of the casing 2.

(3) In the above embodiment, the winding 40d is connected by three-phase delta connection, but the present invention is not limited to this. The winding 40d may be connected by a so-called three-phase star connection.

DESCRIPTION OF SYMBOLS 1 ... Blower motor unit, 2 ... Casing, 20 ... Casing part, 3 ... Base frame, 4 ... Motor, 40b ... Upper insulator, 40c ... Lower insulator, 40d ... Winding, 40d1 ... End part, 40d2 ... Tip part, 40m ... Winding holding part, 40m1 ... Vertical part, 40m2 ... Winding winding part, 5 ... Circuit board, 50 ... Notch part, 51 ... Bus bar, 51a ... Connection recess, B ... Blower fan

Claims (2)

A blower motor unit for air conditioning comprising a brushless motor and a circuit board for driving the brushless motor,
A winding holding part for holding the brushless motor winding;
The circuit board includes a connection terminal to which an end of the winding is directly connected, and a notch ,
The brushless motor includes a stator having an insulating member,
The insulating member is formed with a ventilation opening,
The winding holding part is provided integrally with the insulating member, protrudes in the axial direction of the output shaft from a portion adjacent to the ventilation opening, and is wound up around which the winding drawn from the stator is wound. And a winding winding portion that protrudes radially inward from the vertical portion and that is wound with the winding wound around the vertical portion,
The air conditioning blower motor unit , wherein the connection terminal is disposed in the notch . A frame member on which the brushless motor and the circuit board are mounted on the front and back;
2. The air conditioning blower motor unit according to claim 1 , wherein the frame member includes a frame opening that faces the connection terminal disposed in the notch and the winding holding part .

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