JP2017163693A - motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress infiltration of water droplets deposited at a stator side to a circuit device side.SOLUTION: A motor unit 10 comprises: a stator 12 including a coil 28 formed by winding a winding wire 26 having an insulative coating on a surface of a conductive member; a rotor 14 which rotates by receiving a rotational magnetic field generated by the stator 12; and a center piece 16 which supports the stator 12 and with which a center piece side winding wire insertion hole 16D is formed for inserting the winding wire 26. The motor unit 10 also comprises: a circuit device 18 which is disposed at an opposite side of a side where the stator 12 is fixed with respect to the center piece 16, includes a connection part 44A for connecting the winding wire 26 passed through the center piece side winding wire insertion hole 16F, and controls electrification to the winding wire; and a potting part 53 which is formed using a potting material, and closes a gap formed between the center piece side winding wire insertion hole 16D and the winding wire 26, while being partially adhered to the coating of the winding wire 26.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a motor.

  The following Patent Document 1 discloses a stator having a coil formed by winding a winding around a stator core, a rotor that rotates by receiving a rotating magnetic field of the stator, and a circuit device that controls energization of the winding. A brushless motor including a base on which a stator and a circuit device are fixed is disclosed. In this brushless motor, the circuit device is fixed to the side opposite to the side where the stator is fixed in the base. Therefore, an opening for guiding the terminal portion of the winding wound around the stator core to the circuit device side is formed in the base.

  By the way, depending on the environment in which the brushless motor is used, it is necessary to prevent water droplets adhering to the stator side from entering the circuit device side through an opening formed in the base. Therefore, in the brushless motor described in Patent Document 1 below, by providing an insulator between the opening formed in the base and the winding inserted through the opening, the water droplets attached to the stator side are moved to the circuit device side. Infiltration is suppressed.

Japanese Patent Laying-Open No. 2015-142455

  In view of the above fact, an object of the present invention is to obtain a motor capable of suppressing water droplets adhering to the stator side from entering the circuit device side.

  The motor according to claim 1 is rotated by receiving a stator having a coil formed by winding a winding having an insulating film on a surface of a conductive member, and a rotating magnetic field generated by the stator. A rotor that supports the stator, a center piece that is formed with a center piece side winding insertion hole through which the winding is inserted, and is disposed on the opposite side of the center piece from the side on which the stator is fixed A connection part to which the winding that has passed through the centerpiece-side winding insertion hole is connected, a circuit device that controls energization to the winding, and a potting material, and a part thereof A potting portion that closes a gap formed between the center piece side winding insertion hole and the winding while being in close contact with the coating of the winding.

  According to the motor of the first aspect, the stator generates a rotating magnetic field by controlling the energization to the winding connected to the connection portion of the circuit device. In response to this rotating magnetic field, the rotor rotates. Here, in the motor according to the first aspect, the winding is inserted through the center piece side winding insertion hole formed in the center piece supporting the stator. Further, a gap formed between the center piece side winding insertion hole and the winding is closed by a potting portion formed using a potting material. Thereby, it is possible to prevent water droplets adhering to the stator side from entering the circuit device side through the center piece side winding insertion hole. In particular, in the motor according to the first aspect of the present invention, a bonding state between the potting portion and the winding can be improved by adopting a configuration in which the potting portion is in close contact with the coating of the winding. Thereby, it can suppress that the water droplet adhering to the stator side permeates into the circuit device side through between a potting part and a coil | winding.

  The motor according to claim 2 is the motor according to claim 1, wherein the center piece is formed with a plurality of center piece side winding insertion holes, and the center piece side winding insertion holes and the plurality of center piece side winding insertion holes. Each gap formed between the windings inserted into the centerpiece side winding insertion holes is closed by the single potting portion.

  According to the motor of the second aspect, the respective gaps are closed by a single potting part, thereby improving workability when forming the potting part for closing each gap. can do.

  According to a third aspect of the present invention, in the motor according to the first or second aspect, the center piece is formed with a recess that is open on one side in the rotation axis direction of the rotor. A line insertion hole is formed at the bottom of the recess.

  According to the motor of the third aspect, the potting material for forming the potting portion can be retained in the recess by forming the center piece side winding insertion hole in the bottom of the recess. Thereby, the workability | operativity at the time of forming the potting part for plugging up the clearance gap formed between the centerpiece side coil | winding insertion hole and a coil | winding can be made favorable.

  According to a fourth aspect of the present invention, in the motor according to the third aspect, the plurality of centerpiece side winding insertion holes are formed at the bottom of the single concave portion.

  According to the motor of claim 4, the gap formed between the center piece side winding insertion hole and the winding is formed by forming a plurality of center piece side winding insertion holes in the bottom of the single recess. The workability at the time of forming the potting portion for closing the cover can be further improved.

  The motor according to claim 5 is the motor according to any one of claims 1 to 4, wherein the winding is inserted between the center piece side winding insertion hole and the winding. An insulating cap having a cap-side winding insertion hole formed therein is provided, and an inner diameter of the portion on the stator side in the cap-side winding insertion hole decreases from the stator side toward the circuit device side. It has become.

  According to the motor according to claim 5, by providing an insulating cap between the center piece side winding insertion hole and the winding, between the winding and the peripheral part of the center piece side winding insertion hole. An insulating state can be easily ensured. Further, by forming the inner diameter of the portion on the stator side in the cap side winding insertion hole formed in the cap so as to decrease from the stator side toward the circuit device side, the winding can be easily performed from the stator side to the circuit device side. Can be inserted.

  The motor according to claim 6 is the motor according to claim 5, wherein the inner diameter of the portion on the circuit device side in the cap side winding insertion hole is the center of the rotor side in the direction of the rotation axis of the rotor in the cap side winding insertion hole. The potting portion is provided on the circuit device side with respect to the center piece.

  According to the motor of the sixth aspect, the inner diameter of the portion on the circuit device side in the cap-side winding insertion hole formed in the cap is compared with the inner diameter of the central portion in the rotation axis direction of the rotor in the cap-side winding insertion hole. By increasing the size, the contact area between the potting part and the coating formed on the winding can be increased. Thereby, the joint strength between the potting portion and the coating formed on the winding can be increased.

It is a sectional side view which shows a brushless motor. FIG. 2 is a side view schematically showing a part of a stator in an enlarged manner. It is an expanded sectional view which shows the part in which the terminal part of a coil | winding is inserted in a centerpiece. It is an expanded sectional view which expands further the part in which the terminal part of a coil | winding in a centerpiece is inserted rather than FIG. It is an expansion perspective view which expands and shows the part in which the communication hole was provided in the centerpiece. It is the side view which showed the pressurization process of the terminal part of a coil | winding typically, (A) shows a backup insertion process, (B) shows the bending process by a 1st bending jig, (C) shows the 1st 2 shows a bending process using a bending jig. (A) is a bottom view showing the stator after the end of the bending process by the second bending jig, and (B) is a bottom view showing the stator after the end of the winding turning process. (A) is a perspective sectional view showing a process of attaching a cap to a center piece, and (B) and (C) are formed in a center piece side winding insertion hole and a cap in which a winding is formed in the center piece. It is a sectional side view which shows the process of inserting in a cap side coil | winding insertion hole. It is a sectional side view which shows the process of attaching a cover to a center piece. FIG. 4 is an enlarged cross-sectional view corresponding to FIG. 3 showing a cap or the like attached from the opposite side to the direction shown in FIG. 3. It is an expanded sectional view showing the cap side winding insertion hole of the cap concerning the 1st modification. It is an expanded sectional view corresponding to Drawing 11 showing the cap side winding penetration hole of the cap concerning the 2nd modification.

  Next, a motor according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, a motor unit 10 as a motor of the present embodiment includes a stator 12 that generates a rotating magnetic field, a rotor 14 that is rotated by a rotating magnetic field generated by the stator 12, a rotor 14 and a stator 12, and the like. , A circuit device 18 that controls the rotation of the rotor 14 by controlling energization to the windings 26 that constitute a part of the stator 12, and a cover 20 that covers the circuit device 18. ing. In addition, the arrow Z direction, the arrow R direction, and the arrow C direction that are appropriately shown in the drawing indicate the rotation axis direction, the rotation radial direction, and the rotation circumferential direction of the rotor 14, respectively. In the following description, when only the axial direction, radial direction, and circumferential direction are indicated, the rotational axis direction, rotational radial direction, and rotational circumferential direction of the rotor 14 are indicated unless otherwise specified.

(Configuration of stator 12)
As shown in FIGS. 1 and 2, the stator 12 is configured by winding a winding 26 around a predetermined portion of a stator core 24 that is formed using a magnetic metal and to which an insulator 22 is attached. ing.

  The stator core 24 has an annular portion 24A formed in an annular shape, and a plurality of (in the present embodiment, 12 pieces) that protrude radially outward from the outer peripheral portion of the annular portion 24A and are arranged at equal intervals along the circumferential direction. Teeth portion 24B. Moreover, the winding 26 which has an insulating film on the surface of the electroconductive member formed in linear (wire shape) is wound by each teeth part 24B. Thereby, the coil 28 is each formed around each teeth part 24B.

  As shown in FIG. 2, the portion led out from the stator core 24 side in each winding 26 forming the coil 28 is bent into a predetermined shape (substantially N-shaped). Specifically, the portion of the winding 26 that is led out from the stator core 24 side includes a first extending portion 26A that extends to one axial direction with respect to the stator core 24, and one axial direction of the first extending portion 26A. A second extending portion 26B that extends radially outward from the side end and is inclined to the other axial side as it goes radially outward. Further, the portion of the winding 26 that is led out from the stator core 24 side extends from the radially outer end of the second extending portion 26B toward the one axial side, and the end on the one axial side is a circuit. A third extending portion 26C connected to the circuit board 44 (see FIG. 3) constituting a part of the device 18 by soldering is provided. In the present embodiment, the inner bent portion 26D that is the boundary between the first extension portion 26A and the second extension portion 26B is the outer side that is the boundary between the second extension portion 26B and the third extension portion 26C. It arrange | positions at the axial direction one side with respect to the bending part 26E.

(Configuration of rotor 14)
As shown in FIG. 1, the rotor 14 includes a rotor housing 30 formed in a substantially bottomed cylindrical shape, and a rotor magnet 32 fixed to the rotor housing 30. The rotor housing 30 includes a bottom wall 30A formed in a disk shape, and a peripheral wall 30B that is bent and extended from the outer peripheral end of the bottom wall 30A to one side in the axial direction, and the rotor magnet 32 is fixed to a radially inner surface. It is equipped with. A pair of bearings 34 is fixed to the shaft center portion of the rotor housing 30 by press-fitting or the like. The pair of bearings 34 is inserted into a shaft member 36 fixed to the center piece 16 described later, so that the rotor housing 30 is supported by the shaft member 36 via the pair of bearings 34 and the rotor housing 30. The rotor magnet 32 and the stator 12 fixed to each other are arranged to face each other in the radial direction.

(Configuration of centerpiece 16)
The center piece 16 as the first member is formed using an aluminum alloy or the like. The center piece 16 is provided with a boss portion 16A that protrudes toward the other side in the axial direction and to which the shaft member 36 is fixed by press-fitting. Further, the above-described stator 12 is fixed to the other side of the center piece 16 in the axial direction via a stator fixing bolt 38 or the like. Further, a circuit device 18 to be described later is fixed to one side in the axial direction of the center piece 16 via a circuit device fixing bolt 40 or the like. A concave groove 16 </ b> B to which a seal material 50 (see FIG. 9) to be described later is applied is formed on the outer peripheral portion on the other axial side of the center piece 16.

  As shown in FIGS. 3 and 4, the center piece 16 is formed with a long concave portion 16 </ b> C that is open on one side in the axial direction and curved in an arcuate shape when viewed in the axial direction. A plurality (three in this embodiment) of centerpiece side winding insertion holes 16D through which the third extending portions 26C of the windings 26 are inserted are formed in the bottom 16C1 of the recess 16C. The plurality of centerpiece side winding insertion holes 16D formed in the bottom 16C1 of the recess 16C are arranged at intervals along the longitudinal direction of the recess 16C. The center piece 16 is formed with recesses 16C and center piece side winding insertion holes 16D corresponding to the number of third extending portions 26C of the winding 26.

  As shown in FIG. 5, on the outer periphery of the center piece 16, a space between the center piece 16 and the cover 20 (see FIG. 1), which is a space in which the circuit device 18 is disposed, and a space outside the space. A communication hole 16E that communicates with each other is formed. One side of the communication hole 16E is opened toward one side in the axial direction in a space in which the circuit device 18 is arranged, and the other side of the communication hole 16E is a space outside the space in which the circuit device 18 is arranged. Are opened radially outward. In addition, the end of the communication hole 16E on the space side where the circuit device is disposed is closed by a filter 42 formed using a material that allows gas to pass therethrough and hardly allows liquid to pass therethrough. As an example of the material of the filter 42, Gore-Tex (registered trademark) is used.

(Configuration of the circuit device 18)
As shown in FIGS. 1 and 5, the circuit device 18 is disposed on the opposite side of the center piece 16 from the side on which the stator 12 is fixed. The circuit device 18 includes a circuit board 44 and a plurality of circuit elements 46 that constitute a control circuit that controls energization of the stator 12 (winding 26).

  The circuit board 44 is formed in a rectangular plate shape whose axial direction is the thickness direction, and this circuit board 44 is formed by forming a conductive pattern portion on a board body formed using an insulating material. It is configured. As shown in FIGS. 3 and 4, the circuit board 44 has an end portion of the third extending portion 26 </ b> C of the winding 26 that has passed through the centerpiece-side winding insertion hole 16 </ b> D formed in the centerpiece 16. 44A is provided to be connected by soldering. The circuit board 44 is supplied with power via a connector 48 (see FIG. 1) attached to the center piece 16.

(Configuration of cover 20)
As shown in FIG. 1, the cover 20 as the second member is formed in a bottomed box shape with the center piece 16 side opened. The cover 20 is joined to the center piece 16 via a sealing material 50 (see FIG. 9), so that a space in which the circuit device 18 is disposed is formed between the cover 20 and the center piece 16. It has become. Specifically, the cover 20 is directed to the circuit board 44 fixed to the center piece 16, a bottom wall 20 </ b> A that extends in the radial direction facing the circuit board 44, and toward the center piece 16 side from the outer peripheral end of the bottom wall 20 </ b> A. And a flange portion 20C extending radially outward from the end of the side wall 20B on the centerpiece 16 side. Further, a convex portion 20D corresponding to the concave groove 16B formed in the center piece 16 is formed in the flange portion 20C.

(Configuration of cap 52)
As shown in FIG. 4, a cap 52 formed of an insulating material is attached to the peripheral portion of the centerpiece side winding insertion hole 16 </ b> D in the centerpiece 16. The cap 52 is formed in a cylindrical shape having a cap-side winding insertion hole 52A through which the third extending portion 26C of the winding 26 is inserted in the axial center portion.

  The portion on the stator 12 side (the other side in the axial direction) in the cap side winding insertion hole 52A is formed in a funnel shape that gradually narrows toward one side in the axial direction. As a result, the inner diameter D1 of the portion on the other side in the axial direction in the cap-side winding insertion hole 52A gradually decreases toward the one side in the axial direction. Further, the inner diameter D2 of the portion on the circuit device 18 side (one axial side) in the cap side winding insertion hole 52A is set to be larger than the inner diameter D3 of the central portion in the axial direction of the cap side winding insertion hole 52A. Has been. The inner diameter D3 of the central portion in the axial direction of the cap side winding insertion hole 52A is substantially the same as the outer diameter D4 of the winding 26.

(Configuration of potting unit 53)
As shown in FIGS. 3 and 4, in the present embodiment, the potting portion 53 is formed in the recess 16 </ b> C formed in the center piece 16, so that the center piece side winding insertion hole 16 </ b> D and the cap 52 A minute gap formed between them and a minute gap formed between the cap 52 and the winding 26 are closed. The potting material forming the potting portion 53 is a silicon resin that can be easily cured by irradiating ultraviolet rays.

  As shown in FIG. 3, in this embodiment, silicon resin is injected into the concave portion 16C formed in the center piece 16, and ultraviolet rays are irradiated onto the silicon resin injected into the concave portion 16C. The potting portion 53 is formed inside the recess 16C. Thus, the single potting portion 53 closes the gaps formed in the peripheral portions of the three centerpiece side winding insertion holes 16D formed in the bottom 16C1 of the recess 16C. In addition, the height (depth) H in the axial direction with respect to the bottom 16C1 of the recess 16C of the potting portion 53 is set to such a height that the cap 52 is not exposed from the potting portion 53.

(Forming method of winding end)
Next, a method for forming a portion derived from the stator core 24 side in each of the windings 26 forming the coil 28 will be described with reference to FIGS.

  As shown in FIGS. 6A to 6C, in this embodiment, the backup 54 inserted between the teeth portions 24 </ b> B of the stator core 24 and the windings 26 are sandwiched between the backups 54. A portion led out from the stator core 24 side in each winding 26 forming the coil 28 is bent into a predetermined shape by a pressing device including the first bending jig 56 and the second bending jig 58.

  The backup 54 includes a plurality of backup configuration blocks 60 divided in the circumferential direction. The backup component block 60 includes an inter-tooth portion insertion portion 60A having a portion disposed between the teeth portions 24B, and an outer peripheral wall portion 60B extending from the radially outer side of the inter-tooth portion insertion portion 60A to the one axial side. Are formed in a substantially L shape in a side view (viewed from the outside in the radial direction). The surface S1 on one side in the axial direction in the inter-tooth portion insertion portion 60A is inclined toward the other side in the axial direction as it goes radially outward. As an example, the angle θ1 with respect to the radial direction of the surface S1 on one side in the axial direction in the inter-tooth portion insertion portion 60A is set to about 4 degrees. Further, the radially inner surface S2 of the outer peripheral wall portion 60B extends along the axial direction.

  The first bending jig 56 is formed in a substantially cylindrical shape, and the radially outer end of the first axial end of the first bending jig 56 is narrowed toward the other axial side. The narrowed portion 56A is used. Further, the inclination angle θ3 with respect to the radial direction of the outer peripheral surface S3 of the constricted portion 56A is set to approximately 45 degrees.

  The second bending jig 58 is formed in an annular block shape into which the first bending jig 56 is inserted. A surface S4 on the other side in the axial direction of the second bending jig 58 corresponds to a surface S1 on the one side in the axial direction of the inter-tooth portion insertion portion 60A of the backup component block 60. That is, the inclination angle S4 with respect to the radial direction of the surface S4 on the other side in the axial direction of the second bending jig 58 is set to about 4 deg. The radially outer surface S5 of the second bending jig 58 is slightly inclined with respect to the radially inner surface S2 of the outer peripheral wall portion 60B of the backup component block 60. That is, the inclination angle θ5 inward in the radial direction with respect to the axial direction of the radially outer surface S5 in the second bending jig 58 is set to about 1.5 deg. The inclination angle θ5 is set in consideration of the spring back from the state shown by the two-dot chain line to the state shown by the solid line in the winding 26 shown in FIG.

  As shown in FIG. 6A, in the state after the coil forming step, the portion led out from the stator core 24 side in each of the windings 26 forming the coil 28 is linear to the one side in the axial direction. It is extended to. After the stator 12 in this state is set in the press device, each backup constituent block 60 is moved radially inward. Thereby, a part of each inter-tooth portion insertion portion 60 </ b> A of each backup component block 60 is disposed between each tooth portion 24 </ b> B of the stator core 24.

  Next, as shown in FIG. 6 (B), the first bending jig 56 is moved to the other side in the axial direction, so that the portions led out from the stator core 24 side in the respective windings 26 forming the coils 28. Of the first bending jig 56 is pressed against the outer peripheral surface S3 of the constricted portion 56A. As a result, the portion led out from the stator core 24 side in each winding 26 forming the coil 28 is inclined at an angle (approximately 45 degrees with respect to the axial direction) corresponding to the outer peripheral surface S3 of the constricted portion 56A.

  Next, as shown in FIG. 6C, the second bending jig 58 is moved to the other side in the axial direction, so that the portions led out from the stator core 24 side in the respective windings 26 forming the coils 28. Of the second bending jig 58 in the axially other side surface S4 and the radially outer surface S5, and the axially one side surface S1 and the outer peripheral wall portion 60B of the inter-tooth portion insertion portion 60A of the backup component block 60. It is pressurized by being sandwiched between the radially inner surface S2 (winding bending step). Through the above steps, the portions led out from the stator core 24 side in each winding 26 forming the coil 28 are bent into the state shown in FIG.

  In addition, after the winding bending process described above, the second extending portion 26B of the winding 26 is tilted around the third extending portion 26C, as shown in FIG. The extending portion 26C is disposed at a position corresponding to the center piece side winding insertion hole 16D (see FIG. 3) formed in the center piece 16 (winding turning process). 8A and 8B, when the stator 12 is attached to the center piece 16 to which the cap 52 has been previously attached, the third extending portion 26C of the winding 26 is connected to the center piece 16 as shown in FIGS. The center piece side winding insertion hole 16D and the cap side winding insertion hole 52A formed in the cap 52 are inserted (stator mounting step). Next, as shown in FIG. 8C, a potting portion 53 is injected by injecting silicon resin into the recess 16C formed in the center piece 16, and irradiating the silicon resin injected into the recess 16C with ultraviolet rays. Is formed inside the recess 16C (potting portion forming step). Next, as shown in FIG. 3, the third extending portion 26 </ b> C of the winding 26 is connected to the circuit board 44 constituting a part of the circuit device 18 by soldering (winding connecting step).

(Cover installation process)
Next, the process of attaching the cover 20 to the center piece 16 will be described with reference to FIG. In FIG. 9, illustration of the concave groove 16 </ b> B formed in the center piece 16 and the convex portion 20 </ b> D formed in the flange portion 20 </ b> C of the cover 20 is omitted.

  As shown in FIG. 9, first, the suction pump 62 is connected to the communication hole 16E formed in the center piece 16 (pump connection process).

  Next, the sealing material 50 is injected into the concave groove 16 </ b> B (see FIG. 1) formed in the center piece 16. The amount of the sealing material 50 injected into the concave groove 16B is such an amount that the sealing material 50 protrudes from the open end of the concave groove 16B. Note that a portion corresponding to the concave groove 16B may be formed in the flange portion 20C of the cover 20, and the sealing material 50 may be applied to the portion corresponding to the concave groove 16B.

  Next, by operating the suction pump 62, the flange portion 20C of the cover 20 is joined to the portion of the center piece 16 where the sealing material 50 is applied while drawing air on the circuit device 18 side through the communication hole 16E (joining step). )

  The motor unit 10 of this embodiment is manufactured through the steps described above and other steps.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  As shown in FIG. 1, in the motor unit 10 of the present embodiment, the stator 12 generates a rotating magnetic field by controlling the energization of the stator 12 (winding 26) by the circuit device 18. The rotor 14 is rotated by the interaction between the rotating magnetic field and the magnetic field of the rotor magnet 32.

  Here, in the motor unit 10 of the present embodiment, as shown in FIG. 3, the third extension portion 26 </ b> C of the winding 26 is inserted into the center piece side winding formed in the center piece 16 that supports the stator 12. The hole 16D and the cap 52 are inserted into the cap-side winding insertion hole 52A, and the potting portion 53 is formed in the recess 16C formed in the center piece 16, so that the center-piece side winding is inserted. A minute gap formed between the hole 16D and the cap 52 and a minute gap formed between the cap 52 and the winding 26 are closed. Thereby, it can suppress that the water droplet adhering to the stator 12 side permeates into the circuit apparatus 18 side through the peripheral part of center piece side coil | winding insertion hole 16D. In particular, in this embodiment, the potting portion 53 is in close contact with the coating film of the winding 26, so that the bonding state between the potting portion 53 and the winding 26 can be improved. Thereby, it is possible to prevent water droplets adhering to the stator 12 side from entering the circuit device 18 through the potting portion 53 and the winding 26.

  In the present embodiment, the gap between the peripheral portions of the plurality (three) of the third extending portions 26 </ b> C is closed by the single potting portion 53. Thereby, workability | operativity at the time of forming the potting part 53 for plugging each clearance gap can be made favorable.

  In addition to this, in this embodiment, a potting material for forming the potting portion 53 is formed by forming the center piece side winding insertion hole 16D at the bottom of the recess 16C formed in the center piece 16. Can be retained in the recess 16C. Thereby, the workability | operativity at the time of forming the potting part 53 for plugging up the clearance gap formed between the centerpiece side coil | winding insertion hole 16D and the coil | winding 26 can be made favorable.

  Furthermore, in the present embodiment, a plurality of center piece side winding insertion holes 16D are formed at the bottom of the single recess 16C, so that the center piece side winding insertion hole 16D and the winding 26 are located between each other. The workability at the time of forming the potting portion 53 for closing the gap formed in the above can be further improved.

  In the present embodiment, the insulating cap 52 is provided between the centerpiece-side winding insertion hole 16D and the winding 26, so that the winding 26 and the peripheral edge portion of the centerpiece-side winding insertion hole 16D are provided. The insulation state between them can be easily secured. Further, by forming the inner diameter D1 of the portion on the stator 12 side in the cap side winding insertion hole 52A formed in the cap 52 so as to decrease from the stator 12 side toward the circuit device 18 side, the winding 26 is formed in the stator. It can be easily inserted from the 12 side to the circuit device 18 side.

  Further, in this embodiment, the inner diameter D2 of the portion on the circuit device 18 side in the cap-side winding insertion hole 52A formed in the cap 52 is compared with the inner diameter D3 of the central portion in the axial direction of the cap-side winding insertion hole 52A. By increasing the size, the contact area between the potting portion 53 and the coating formed on the winding 26 can be increased. Thereby, the joining strength of the potting part 53 and the film formed in the coil | winding 26 can be raised. In addition, as shown in FIG. 10, the contact area between the potting portion 53 and the coating formed on the winding 26 can be increased by attaching the cap 52 to the center piece 16 in the state of being inverted in the axial direction. it can.

  In the present embodiment shown in FIG. 3, the portion on the stator 12 side in the cap side winding insertion hole 52A is formed in a funnel shape, so that the portion on the other side in the axial direction in the cap side winding insertion hole 52A is formed. Although the example in which the inner diameter D1 is configured to gradually decrease toward the one side in the axial direction has been described, the present invention is not limited to this. For example, as shown in FIG. 11, a portion on the stator 12 side in the cap side winding insertion hole 52 </ b> A may be formed in a funnel shape and an intermediate portion in the axial direction of the portion may be bent. Further, as shown in FIG. 12, a portion on the stator 12 side in the cap side winding insertion hole 52A may be formed in a funnel shape, and the inner peripheral surface thereof may be gently curved.

  In the present embodiment, the example in which the cap 52 is attached to the center piece 16 has been described. However, the present invention is not limited to this. For example, it is good also as a structure which does not provide the cap 52 by making the peripheral part of centerpiece side coil | winding insertion hole 16D formed in the centerpiece 16 into the structure similar to a cap.

  As shown in FIG. 2, in the stator 12 constituting a part of the motor unit of the present embodiment, the inner bent portion 26 </ b> D that is the boundary between the first extending portion 26 </ b> A and the second extending portion 26 </ b> B of the winding 26. Is arranged on one side in the axial direction with respect to the outer bent portion 26E that is the boundary between the second extending portion 26B and the third extending portion 26C. As a result, compared to the configuration in which the inner bent portion 26D and the outer bent portion 26E are disposed at the same position in the rotation axis direction, the portion of the stator 12 on the outer side in the rotation radial direction is brought closer to the center piece 16. It becomes possible to arrange. As a result, it is possible to suppress an increase in the size of the motor unit 10 in the direction of the rotation axis.

  In the present embodiment, the second extending portion 26B, which is a portion between the first extending portion 26A and the second extending portion of the winding 26, is inclined to the other side in the axial direction as it goes radially outward. Has been. By setting it as the said structure, compared with the case where the 2nd extension part 26B is curved, the length of the 2nd extension part 26B can be shortened. Thereby, it can suppress that the wiring path | route to the circuit device of the part extended from the stator core 24 in the coil | winding 26 becomes long. Whether or not the second extending portion 26B is inclined as described above may be appropriately set in consideration of the configuration of the portion of the center piece 16 where the stator 12 is fixed.

  Further, in the present embodiment, after the winding bending process shown in FIGS. 6A to 6C, the winding turning process shown in FIG. When attaching to the piece 16, the third extending portion 26 </ b> C of the winding 26 is easily inserted into the center piece side winding insertion hole 16 </ b> D formed in the center piece 16 and the cap side winding insertion hole 52 </ b> A formed in the cap 52. It can be inserted. Whether or not the winding turning process is incorporated in the manufacturing process of the motor unit may be selected in consideration of the arrangement of the centerpiece side winding insertion hole 16D formed in the centerpiece 16.

  As shown in FIG. 1, in the motor unit 10 of the present embodiment, the circuit device 18 is disposed in a space formed between the center piece 16 and the cover 20. Further, a sealing material 50 is interposed between the center piece 16 and the cover 20. Thereby, it is suppressed that a water droplet permeates into the space where the circuit device 18 is disposed between the center piece and the cover.

  Incidentally, as shown in FIG. 9, when the cover 20 is attached to the center piece 16 in a state where the seal member 50 is applied, the seal member 50 is crushed between the cover 20 and the center piece 16. It is conceivable that the pressure between the centerpiece 16 and the cover 20 increases when As a result, the sealing material 50 interposed between the center piece 16 and the cover 20 may be scattered. That is, it is conceivable that a portion where the sealing material 50 is missing occurs between the center piece 16 and the cover 20.

  However, in the present embodiment, the space formed between the center piece 16 and the cover 20 and the space outside the space communicate with each other and the space on the outer space side is opened outward in the radial direction. A communication hole 16E is formed in the center piece. Thereby, the suction pump 62 can be easily connected to the portion of the communication hole 16E opposite to the side where the circuit device 18 is disposed. Then, when the sealing material 50 is crushed between the cover 20 and the center piece 16 by attaching the cover 20 to the center piece 16 while drawing air on the circuit device 18 side by the suction pump 62, the center piece 16 An increase in the pressure in the space between the cover 20 and the cover 20 can be suppressed. Thereby, a sealing material can be interposed between the center piece 16 and the cover 20 in a desired state.

  Moreover, in this embodiment, the edge part by the side of the space where the circuit apparatus 18 in the communicating hole 16E is arrange | positioned is closed by the filter 42 which has the above-mentioned specification. In this configuration, when the sealing material 50 is crushed between the cover 20 and the center piece 16, the pressure in the space between the center piece 16 and the cover 20 is likely to increase. However, in this embodiment, the seal member 50 is attached to the center piece 16 while the air on the circuit device 18 side is drawn in by the suction pump 62 connected to the communication hole 16E. When the space between the centerpiece 16 and the cover 20 is crushed, it is possible to suppress an increase in pressure in the space between the centerpiece 16 and the cover 20. Thereby, even in the configuration in which the filter 42 is provided, the sealing material 50 can be interposed between the center piece 16 and the cover 20 in a desired state.

  Whether or not the filter 42 is provided may be appropriately selected in consideration of the environment, posture, and the like in which the motor unit 10 is disposed.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and various modifications other than the above can be implemented without departing from the spirit of the present invention. Of course.

10 Motor unit (motor)
12 Stator 14 Rotor 16 Centerpiece 16C Recess 16C1 Recess Bottom 16D Centerpiece Side Winding Insertion Hole 18 Circuit Device 26 Winding 28 Coil 44A Connection Portion 52 Cap 52A Cap Side Winding Insertion Hole 53 Potting Portion

Claims (6)

A stator having a coil formed by winding a winding having an insulating coating on the surface of a conductive member;
A rotor that rotates in response to a rotating magnetic field generated by the stator;
A center piece that supports the stator and has a center piece side winding insertion hole through which the winding is inserted;
The center piece is disposed on the side opposite to the side on which the stator is fixed, and has a connection portion to which the winding that has passed through the center piece side winding insertion hole is connected. A circuit device for controlling
A potting part that is formed using a potting material and that partially closes the coating of the winding, and that closes a gap formed between the center piece side winding insertion hole and the winding;
With motor. The center piece is formed with a plurality of center piece side winding insertion holes,
Respective gaps formed between the plurality of centerpiece side winding insertion holes and the windings respectively inserted into the plurality of centerpiece side winding insertion holes are blocked by the single potting portion. The motor according to claim 1. The center piece is formed with a recess that is open on one side in the rotational axis direction of the rotor,
The motor according to claim 1, wherein the center piece side winding insertion hole is formed in a bottom of the recess.   The motor according to claim 3, wherein a plurality of the center piece side winding insertion holes are formed at the bottom of the single concave portion. Between the center piece side winding insertion hole and the winding, an insulating cap is provided in which a cap side winding insertion hole through which the winding is inserted is provided,
The motor according to any one of claims 1 to 4, wherein an inner diameter of a portion on the stator side in the cap side winding insertion hole decreases from the stator side toward the circuit device side. The inner diameter of the portion on the circuit device side in the cap side winding insertion hole is larger than the inner diameter of the central portion in the rotation axis direction of the rotor in the cap side winding insertion hole,
The motor according to claim 5, wherein the potting portion is provided on the circuit device side with respect to the center piece.