JP2008148497A - Bus bar structure and electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bus bar structure capable of simplifying a connecting system from coils which constitute respective phases in an electric motor to an external circuit, and contributing to cost and size reductions in the electric motor. <P>SOLUTION: This bar structure 30 includes the bus bars 36 to 39 which are attached at the electric motor having the coils 13a, ... for constituting the respective U, V, W phases and the rotor surrounded by the coils 13a, ... as relay members for relaying electrical connections between the respective coils 13a, ... and the external circuit, and a bus bar holder 31 for fixing the respective bus bars 36 to 39. Crimp-style terminals 36b to 38b which are directly connected to harnesses 40, ... pulled out of the external circuit are integrally formed at the respective bus bars 36 to 38 without the other connecting members. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bus bar structure provided with a bus bar as a relay member attached to an electric motor and relaying an electrical connection between the electric motor and a control circuit as an external circuit.

As an electric motor having a bus bar used as a relay member for relaying an electrical connection with an external control circuit or the like, for example, the one shown in FIG.
This electric motor includes a three-phase lead wire (a bus bar; a conductive member that connects the coil and an external circuit) connected to three coils constituting each phase of U, V, and W. The three-phase lead wires are electrically connected to three harness slots provided on the output terminal block via three-phase output bolts, and the three harnesses are drawn from an external control circuit or the like in each harness slot. (Connection wiring).
Japanese Patent Laying-Open No. 2005-27413, FIG.

  In the conventional electric motor as described above, a three-phase lead wire as a bus bar connected to the coils constituting each phase is connected via an internal terminal and a three-phase output bolt which are other connection members other than the bus bar. It is connected to a harness slot provided on the output terminal block.

  For this reason, in addition to the three-phase lead wire (bus bar) and the internal terminal, a three-phase output bolt is required before the coil is connected to an external circuit. This complicates the connection system from the coils constituting each phase to the external circuit in the electric motor, increases the number of parts, and prevents the electric motor from being downsized by the space occupied by the output terminal block to which the harness slot is fixed. Be able to.

  The present invention has been made to solve the above-described problems, and the object thereof is to simplify the connection system from the coil constituting each phase to the external circuit in the electric motor, thereby reducing the cost of the electric motor. The object is to provide a bus bar structure that contributes to downsizing, a bus bar structure, and an electric motor to which the structure or structure is applied.

  In order to solve the above-mentioned problems, the invention described in claim 1 is attached to an electric motor including a coil constituting each phase and a rotor surrounded by the coil, and an electric circuit between each coil and an external circuit is provided. A bus bar structure that includes a bus bar as a relay member that relays a general connection and a fixing member that fixes each bus bar, and each bus bar is provided separately from a harness that is drawn from the external circuit. The gist of the invention is that the terminal portions that are directly connected without any connection member are integrally formed.

  According to the same configuration, the harness drawn from the external circuit is directly connected to the bus bar as a relay member that relays the electrical connection between the electric motor and the external circuit without using another connection member other than the bus bar. Is done. For this reason, the output terminal block conventionally used for connection of the electric motor and the external circuit becomes unnecessary.

  According to a second aspect of the present invention, in the bus bar structure according to the first aspect of the present invention, in the bus bar structure according to the first aspect, the terminal portion is inserted into the conductor portion of the harness, and the insertion portion is crushed and connected to the conductor portion. The gist is to have a shape portion.

  According to the configuration, the conductor part of the harness is inserted into the ring-shaped part provided in the terminal part integrated with the bus bar, and the bus bar and the harness can be directly connected by crushing the insertion part. it can. For this reason, the connection can be simply performed without using intervening members such as solder and bolts.

  The invention according to claim 3 is the bus bar structure according to claim 1 or 2, wherein the fixing member is a disk-shaped insulating member that electrically insulates the bus bars from each other, and the bus bars are Each is formed in an arc shape, and is held and fixed in an embedded state in the disk-shaped insulating member, and the arc portion of each bus bar is electrically connected to the end of the coil constituting each phase. The gist is that the bus bar terminals to be connected are integrally formed at a predetermined interval according to the arrangement state of the coil.

  According to this configuration, the coil end portion (conducting wire portion) that surrounds the rotor and is arranged on one circumference and the concentric arc-shaped bus bar corresponding to each phase are arranged in the coil. The bus bar terminals formed integrally with the arc portion of each bus bar at a predetermined interval according to the state can be connected by a short path.

  The invention according to claim 4 is an electric motor comprising a coil constituting each phase and a rotor surrounded by the coil, and the bus bar structure according to any one of claims 1 to 3 is attached. It is a summary.

  According to this configuration, the coils constituting each phase in the electric motor are directly connected to the harness drawn from the external circuit without using another connecting member other than the bus bar.

  According to a fifth aspect of the present invention, there is provided a bus bar structure including a bus bar as a relay member that relays electrical connection between a coil constituting each phase and an external circuit in an electric motor, and a harness drawn from the external circuit The gist of the present invention is that the terminal is integrally connected to the bus bar without being connected via another connecting member other than the bus bar.

  According to the same configuration, the harness drawn from the external circuit is directly connected to the bus bar as a relay member that relays the electrical connection between the electric motor and the external circuit without using another connecting member other than the bus bar. Get connected. For this reason, the output terminal block conventionally used for connection between the electric motor and the external circuit becomes unnecessary.

  The invention according to claim 6 is the bus bar structure according to claim 5, wherein each of the bus bars is formed in an arc shape and arranged concentrically, and the arc portion of each bus bar has The gist is that the bus bar terminals that are electrically connected to the end portions of the coils constituting each phase are integrally formed at a predetermined interval according to the arrangement state of the coils.

  According to this configuration, the coil end portion (conducting wire portion) that surrounds the rotor and is arranged on one circumference and the concentric arc-shaped bus bar corresponding to each phase are arranged in the coil. The bus bar terminals formed integrally with the arc portion of each bus bar at a predetermined interval according to the state can be connected by a short path.

  According to the bus bar structure and the bus bar structure of the present invention, the connection system between the coil constituting each phase and the external circuit in the electric motor is simplified, which contributes to cost reduction and miniaturization of the electric motor.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings.
As shown to Fig.1 (a), the electric motor 1 of this embodiment is used for the electric pump unit 50 used as a hydraulic pump of the transmission at the time of the engine stop of a hybrid vehicle.

  Referring to FIG. 1A, the electric motor 1 includes a rotor 12, a stator core 13 that surrounds the rotor 12, and coils 13 a that are wound around the stator core 13. Furthermore, the electric motor 1 includes a pair of insulators 14a and 14b fitted from both axial ends of the stator core 13 so as to insulate the coils 13a from the stator core 13, and is accommodated in a cylindrical motor case 20a. ing. Further, the first end portion side (the right end portion side of FIG. 1A) of the motor case 20a is closed by a lid member 20b. The electric motor 1 shown in the figure constitutes a three-phase brushless motor, and the twelve pairs of coils 13a, 13a,... Facing each other constitute a U phase, a V phase, and a W phase, respectively. (See FIG. 4). In the present embodiment, the insulators 14a and 14b are each formed by injection molding using a PPS (polyphenylene sulfide) resin (insulator).

  The electric pump unit 50 includes a pump unit 2 that sucks and discharges fluid, and the pump unit 2 and the electric motor 1 are unitized. Specifically, the pump unit 2 constitutes a so-called trochoid pump, and includes an outer rotor 21 and an inner rotor 22 that is meshed with the outer rotor 21 and is rotatable. The pump portion 2 is formed in a bottomed rectangular tube shape and is connected and fixed to the motor case 20a from the second end side (the left end side in FIG. 1A). And a pump chamber 24 constituted by a lid portion 23 that closes the open end of the pump case 20. Furthermore, the end of the rotor 12 on the pump part 2 side supports the inner rotor 22.

  A cylindrical magnet 12 a is fixed to the outer periphery of the rotor 12. The magnet 12 a is supported by the large diameter portion of the rotor 12. Further, the rotor 12 is respectively connected via a first rolling bearing 4 provided at the center of the bottom 20c of the pump case 20 and a second rolling bearing 5 provided at the center of the lid member 20b. The pump case 20 and the motor case 20a are rotatably supported.

  In the electric pump unit 50 of this embodiment, referring to FIG. 1A, a plurality of hall elements 25 for detecting the position of the rotor 12 on the lid member 20b of the motor case 20a,. A circuit board 9 on which is disposed is attached using screws 9a. Then, through a disk-shaped target member 25a (which is magnetized in the circumferential direction corresponding to the magnetic pole pattern of the magnets 12a, 12a) that is fixed to the rotor 12 so as to face the Hall elements 25,. Thus, the position of the rotor 12 is detected.

  Further, in the electric pump unit 50, the insulator 14b on the pump unit 2 side (left side of FIG. 1A) is connected to the coils 13a as shown in FIG. 1B, FIG. 2 and FIG. And arc-shaped bus bars 36, 37, 38, 39 as relay members for relaying the electrical connection between the coils 13a,... And an external control board (not shown), and the bus bars 36 to 39 embedded therein. A bus bar structure 30 including a disk-shaped bus bar holder 31 (fixing member, disk-shaped insulating member) that is held and fixed in an insulated state is attached. Specifically, as shown in FIGS. 1B, 2, and 3, the bus bars 39, 36, 37, and 38 are respectively located at positions corresponding to the center point O of the bus bar holder 31. The holder 31 is embedded sequentially from the outer periphery. That is, the bus bars 39, 36, 37, and 38 are integrally formed with the bus bar holder 31 by injection molding so that the bus bars 39, 36, 37, and 38 are embedded and fixed at predetermined positions in this order from the outer periphery. The bus bar holder 31 is made of heat-resistant PPS (polyphenylene sulfide) resin in consideration of automotive applications.

  Here, as shown in FIG. 4, the bus bar 39 forms a common terminal (COM) for each phase of U, V, and W, and is formed to be the longest. The bus bars 38, 37, and 36 constitute U, V, and W phase electrodes, respectively.

  Referring to FIGS. 2 to 4, twelve (two or more) bus bar terminals 39a,... Each having a slit-like portion 39b (folded shape portion) having one open end are integrally formed on the arc portion of the bus bar 39. ing. Each bus bar terminal 39a is connected to a first end portion 13c of a pair of coils 13a and 13a constituting the U, V, and W phases, respectively. On the other hand, the bus bar terminals 36a to 38a are formed in the same shape as the bus bar terminals 36a, ... on the arc portions of the bus bars 36 to 38, respectively, and each has a slit-like part opened at one end, respectively. ,... Are integrally formed by four. Each bus bar terminal 36a, 37a, 38a is connected to the second end 13c of the pair of coils 13a, 13a, respectively. Specifically, as shown in FIG. 2, the end portions 13c of the coils 13a are engaged with the slit-shaped portions of the bus bar terminals 36a to 39a, and further joined by TIG welding. Further, each of the bus bar terminals 36a, ..., 37a, ..., 38a, ..., 39a, ... is configured to protrude outward from the outer peripheral edge of the bus bar holder 31. Thus, in this embodiment, the bus bar terminals 36a,... Electrically connected to the ends of the coils 13a, 13a constituting the U, V, W phases are formed on the arc portions of the bus bars 36-39. , 37a,..., 39a,... Are integrally formed at a predetermined interval according to the arrangement state of the plurality of coils 13a, 13a,.

  Further, referring to FIGS. 1 to 3, the bus bars 36 to 38 are respectively drawn from the external control circuit 60 (external circuit) (see FIG. 4) in correspondence with the U, V, and W phases. The conducting wire portion 40a of the harness 40 is inserted. Then, the insertion portion is crushed and crimped terminals 36b, 37b, 38b (terminal portions) having ring-shaped portions 36c, 37c, 38c for electrical connection with the conducting wire portion 40a are integrally formed one by one. ing. In this way, the harnesses 40,... Drawn from the control circuit 60 are directly connected to the crimp terminals 36b to 38b without passing through other connection members separated from the bus bars 36 to 38. ing.

  And each bus-bar 36,37,38 is electrically connected to the external control circuit 60 shown in FIG. 4 in the said crimp terminal 36b-38b, respectively, The position of the rotor 12 detected by the said Hall element 25, ... Based on the information, the rotation of the electric motor 1 is controlled. In the present embodiment, each of the bus bars 36 to 39 is formed by forming a long metal plate material (a plate material obtained by applying tin plating to copper) into an arc shape by bending or the like from a flat plate state.

The bus bar structure 30 and the bus bar structure of the present embodiment are configured as described above and exhibit the following operations and effects.
(1) A harness drawn from the external control circuit 60 to the bus bar structure 30 itself having the bus bars 36 to 38 as relay members that relay electrical connection between the electric motor 1 and the control circuit 60 (external circuit). 40 is directly connected without passing through another connecting member other than the bus bars 36 to 38 (such as an internal terminal or a three-phase output bolt shown in the background art). For this reason, the connection system from the coils 13a of the electric motor 1 to the external control circuit 60 is simplified. As a result, the output terminal block conventionally used for connection of the electric motor 1 and the external control circuit 60 becomes unnecessary, which contributes to cost reduction and miniaturization of the electric motor 1.

  (2) The conductor portion 40a of the harness 40 is inserted into the ring-shaped portions 36c to 38c of the crimp terminals 36b to 38b (terminal portions) integrated with the bus bars 36 to 38, and the insertion portion is crushed to bus bars 36 to 38c. 38 and the harness 40 can be directly connected. For this reason, the connection can be simply performed without using intervening members such as solder and bolts.

  (3) End portions 13c (conductor portions) of coils 13a, 13a,... Of U, V, and W phases arranged on one circumference surrounding the rotor 12, and circles corresponding to the phases. The arc-shaped bus bars 36 to 39 are connected to each other by a short path by bus bar terminals 36a to 39a formed integrally with the arc portions of the bus bars 36 to 39 at predetermined intervals according to the arrangement state of the coils 13a,. it can. For this reason, the connection system from the coils 13a and 13a to the bus bars 36 to 39 is simplified.

The above embodiment may be modified as follows.
-In the said embodiment, the ring-shaped parts 36c-38c by which the conducting wire part 40a of the harness 40 is inserted into the terminal part integrally formed in the bus-bars 36-38, and the said insertion site is crushed and connected with the said conducting wire part 40a. Crimp terminals 36b to 38b having However, the technical idea of the present invention is not limited to this, and the terminal portion may be a crimp terminal having a hook-shaped portion, or a screw hole is formed in the inner diameter of the ring-shaped portions 36c to 38c, and the harness 40 The lead wire portion 40a may be screwed and connected. In short, the bus bars 36 to 38 may be directly connected to the harness 40 drawn from the control circuit 60 without using another connecting member other than the bus bars 36 to 38 such as bolts and terminals.

(A) is an axial sectional view showing an essential part of an electric pump unit according to an embodiment of the present invention, and (b) is an end view in the direction of arrows AA in (a). The perspective view which shows the bus-bar structure which concerns on embodiment of this invention. The perspective exploded view which shows the bus-bar structure which concerns on embodiment of this invention. The wiring diagram which shows the wiring system of the coil and bus bar which concern on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electric motor, 12 ... Rotor, 13 ... Stator core, 13a ... Coil, 14b ... Insulator, 31 ... Busbar holder, 36-39 ... Busbar, 36a-39a ... Busbar terminal, 36b-38b ... Crimp terminal, 36c-38c ... Ring-shaped part, 40 ... harness, 40a ... conductor part.

Claims (6)

A bus bar as a relay member that is attached to an electric motor including a coil constituting each phase and a rotor surrounded by the coil and relays an electrical connection between each coil and an external circuit, and a fixing that fixes each bus bar A bus bar structure comprising a member,
Each bus bar is integrally formed with a terminal portion that is directly connected to a harness drawn from the external circuit without using another connecting member. The bus bar structure according to claim 1,
The bus bar structure, wherein the terminal portion includes a ring-shaped portion into which the conductor portion of the harness is inserted and the insertion portion is crushed and connected to the conductor portion. In the bus bar structure according to claim 1 or 2,
The fixing member is a disk-shaped insulating member that electrically insulates the bus bars from each other;
Each bus bar is formed in an arc shape and is held and fixed in an embedded state in the disk-shaped insulating member, and the arc portion of each bus bar has an end of a coil constituting each phase. The bus-bar structure in which the bus-bar terminal electrically connected with a part is integrally formed at predetermined intervals according to the arrangement state of the coil. In an electric motor comprising a coil constituting each phase and a rotor surrounded by the coil,
An electric motor to which the bus bar structure according to any one of claims 1 to 3 is attached. In the bus bar structure constituted by the bus bar as a relay member that relays the electrical connection between the coil constituting each phase and the external circuit in the electric motor,
A bus bar structure configured such that a harness drawn from the external circuit is directly connected to a terminal portion integrally formed with the bus bar without using another connecting member other than the bus bar. . In the bus bar structure according to claim 5,
Each bus bar is formed in a circular arc shape and arranged concentrically, and a bus bar terminal electrically connected to an end portion of a coil constituting each phase on each circular arc portion of each bus bar However, the bus bar structure is integrally formed with a predetermined interval according to the arrangement state of the coil.

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