JP3669357B2 - Electric wire structure of rotating electrical machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a feed line structure for supplying a composite current to a plurality of armature coils constituting a stator of a rotating electrical machine having a plurality of rotors driven by a composite current via a plurality of bus bars.
[0002]
[Prior art]
Conventionally, a stator having a coil, an outer rotor disposed radially outward of the stator, an inner rotor disposed radially inward of the stator, a stator fixedly supported, and the outer rotor and inner rotor are mutually connected. A coaxial rotating electric machine including a housing that is rotatably supported on a predetermined rotation axis at the same time has already been disclosed (for example, see Patent Document 1).
[0003]
In this conventional rotating electrical machine, it is necessary to supply a composite current to a plurality of armature coils constituting the stator in order to give magnetic lines of force separately to the outer rotor and the inner rotor and to rotate the outer rotor and the inner rotor separately. is there. However, the interior of the rotating electrical machine including the rotating shaft at the center becomes high temperature and there is not enough space for wiring. For this reason, it is difficult to directly connect a power supply line to each part of the plurality of armature coils in terms of temperature and space.
[0004]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-14103 (FIG. 2)
[0005]
[Problems to be solved by the invention]
The present applicant has proposed, as an example, a feed line structure in which a plurality of plate-like bus bars are stacked via an insulator in this conventional rotating electric machine. This feed line structure is integrated with an insulating material to effectively use the layout space, solve the space problem, and increase the surface area of the bus bar. The temperature rise can be suppressed, and the temperature problem can be solved.
[0006]
However, it is impossible to adopt a feeder structure in which a plurality of bus bars for supplying a composite current are integrated because of space, and two or more sets of bus bars (for example, three bus bars each having three bus bars). In some cases, it is necessary to adopt a feeder line structure that can be used in a narrow space. In this case, an external magnetic field is generated around the power supply line structure of each group divided by the current flowing through the bus bar, and the external magnetic field affects external wiring such as resolver wiring and surrounding electronic equipment, causing noise. was there.
[0007]
[Means for Solving the Problems]
An object of the present invention is to provide a feeder line structure for a rotating electrical machine that advantageously solves the above problems. The feeder line structure for a rotating electrical machine according to the present invention is based on a composite current whose current sum is always zero . A feed line structure for supplying a composite current to a plurality of armature coils constituting a stator of a rotating electrical machine having a plurality of driven rotors via a plurality of bus bars respectively corresponding to the plurality of armature coils. The composite current is divided into two or more groups so that the sum of currents in each group becomes zero, and a plurality of bus bar groups that supply the composite current divided into two or more groups are selected, and each selected bus bar group is selected. Further, the bus bars are brought close to each other so as not to make electrical contact, and are integrated with an insulating material.
[0008]
【The invention's effect】
In the feeder line structure of the rotating electrical machine of the present invention, a set of bus bars is selected such that the current sum is zero in a plurality of bus bars, and the bus bars are not electrically contacted for each selected set of bus bars. By bringing them close together and integrating with an insulating material, each bus bar pair does not generate a magnetic field to the outside, so it does not affect external wiring such as resolver wiring and surrounding electronic equipment, and causes noise. This problem can be solved completely. Further, by integrating with an insulating material, the layout space can be used effectively and the surface area of the bus bar can be increased, so that the temperature rise due to bus bar heat generation at the peak of the composite current can be suppressed.
[0009]
The feeder line structure of the rotating electrical machine according to the present invention may have a structure in which the periphery of the integrated bus bar is covered with a conductive metal. If comprised in this way, a strong shielding effect can be exhibited with respect to an internal integrated busbar by connecting a conductive metal to a ground level.
[0010]
Moreover, in the feeder line structure of the rotating electrical machine of the present invention, the conductive metal and the rotating electrical machine case or support member may be electrically and mechanically connected. If comprised in this way, in addition to the strong shielding effect, the support of the integrated bus-bar will be attained.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a composite current multilayer motor as an embodiment of a rotating electrical machine that is an object of the present invention, which is combined with a Ravigneaux planetary gear train to constitute a hybrid transmission for a vehicle. The composite electric current multi-layer motor can be applied with the feed line structure of the rotating electrical machine of the present invention. A composite current multilayer motor having the configuration shown in FIG. 1 includes an annular stator 1 and an inner rotor 2 disposed rotatably on a predetermined rotation axis C coaxial with each other in the radial direction inward and outward thereof. A triple structure composed of the outer rotor 3 is formed and housed in the housing 4.
[0012]
Each of the inner rotor 2 and the outer rotor 3 includes laminated cores 24 and 25 that are laminated in the rotor axial direction of plate materials made by press-molding electromagnetic steel sheets and the like. Permanent magnets penetrating in the direction are arranged at equal intervals in the circumferential direction.
[0013]
When the inner rotor 2 and the outer rotor 3 are housed in the housing 4, the outer rotor 3 is provided with a torque transmission shell 5 drivingly coupled to the outer periphery of the laminated core 25, and both ends of the torque transmission shell 5 are respectively bearings. The torque transmission shell 5 is coupled to the outer rotor shaft 9 on the bearing 7 side.
[0014]
The inner rotor 2 is provided at the center of the laminated core 24 with a hollow inner rotor shaft 10 penetrating the outer rotor shaft 9 rotatably therein, and between the laminated core 24 of the inner rotor 2 and the inner rotor shaft 10. Drive coupled. An intermediate portion of the inner rotor shaft 10 is rotatably supported by a bearing 12 in a fixed stator bracket 13, and one end portion (left end portion in FIG. 1) is rotatably supported by a bearing 14 on a corresponding end wall of the torque transmission shell 5. To support.
[0015]
The stator 1 includes a large number of stator pieces formed by laminating I-shaped stator steel plates made by press-forming electromagnetic steel plates in the stator axial direction. Each stator piece is wound with an electromagnetic coil 17 as shown in FIG. 1 at a tooth portion between the outer rotor side yoke and the inner rotor side yoke, and these coiled stator pieces are equally spaced in the same circumferential direction. In other words, a stator core is formed by arranging in a circular shape, and the stator core is integrated by sandwiching the stator core between the brackets 13 and 18 on both sides of the stator axial direction with bolts 19 and molding with the resin 20 as a whole. . In the resin 20, the coolant passage 41 is formed in the axial direction between the adjacent stator pieces 16, and the bolts 19 described above are positioned inward and outward in the radial direction of the coolant passage 41. Here, each bolt 19 is tightened by a nut 19a screwed to it. Needless to say, the tightening structure using bolts and nuts may be a tightening structure using rivet pins.
[0016]
In driving the motor, the rotors 2 and 3 according to the rotational positions of the inner rotor 2 and the outer rotor 3 detected by the rotation sensor 48 and the rotation sensor 47, that is, the positions of the permanent magnets provided as described above. The composite current obtained by combining the drive currents for the motor is supplied to the electromagnetic coil 17 of the stator 1, thereby generating the rotating magnetic fields for the rotors 2 and 3 individually in the stator, thereby synchronizing with the rotating magnetic field. The rotors 2 and 3 can be individually rotated.
[0017]
In order to supply the composite current to the electromagnetic coil 17 of the stator 1, a bus bar is used in the feeder line structure of the rotating electrical machine of the present invention. That is, an outer feeder line structure 101 in which a plurality of striped bus bars are laminated via an insulator on the outer side of a connector using a fixing bolt 58 provided around the rotation axis C of the housing 4 is formed. The inner feeder line structure 102 in which a plurality of disk-shaped bus bars each having a circular space through which the rotation shaft passes is laminated via an insulator is formed inside. And, from the outside, for example, a composite current composed of six types of currents in three phases is supplied to the outer feeder line structure 101, the feeder line 103, the connector using the fixing bolt 58, the feeder line 104, and the inner feeder line structure 102, The stator 1 is configured to be supplied to each of a large number of stator pieces each wound with an electromagnetic coil 17.
[0018]
FIG. 2 is a view showing a state seen from the right side of FIG. 1 in order to explain the outer feeder line structure 101. In the example shown in FIG. 2, three terminals 111 constitute one set, and two sets of six terminals 111 constitute the outer feeder line structure 101. Then, six types of composite currents are supplied in three phases via a total of six terminals 111. Each terminal 111 includes a protective cover 112 that covers the fixing bolt 58 and a power supply line 103 as a bus bar. Three power supply lines 103 extending separately from the three terminals 111 are stacked in a body 3 of the outer power supply line structure 101 in a direction perpendicular to the drawing in 3 via an insulator (not shown). . The main body 113 extends in a state of being bent twice with respect to the rotation axis counterclockwise. The main body 113 has an external terminal 114 attached to the end opposite to the end to which the terminal 111 is attached. And it is comprised so that a composite electric current can be supplied with respect to the external terminal 114 on the outer side of the attachment surface 115 of the housing 4. FIG.
[0019]
The greatest feature of the feeder line structure of the rotating electrical machine of the present invention is the laminated structure of the feeder line 103 as a bus bar in the main body 113 of the outer feeder line structure 101. That is, when six types of composite currents are supplied by a feed line structure divided into two sets each composed of three bus bars, the present invention determines how to select the set of three bus bars. There are features. Hereinafter, a laminated structure of the feeder line 103 as a bus bar in the main body 113 will be described.
[0020]
FIG. 3 is a (pseudo) phasor diagram of an example of the composite current supplied by the feeder line structure of the rotating electrical machine of the present invention. In the example shown in FIG. 3, it is assumed that six types of composite currents I1 to I6 are supplied. From FIG. 3, when all six bus bars that supply six types of composite currents to be supplied are integrated, the total of the six types of currents is always zero, so there is no need to consider the problem of external magnetic fields. Understand. However, in terms of space, it is not possible to adopt a feeder line structure in which six layers of bus bars are integrated. For example, like the outer feeder line structure 101 shown in FIG. 2, six bus bars are divided into two sets of three. It may be necessary to divide the feed line structure.
[0021]
In such a case, the present invention selects a set of bus bars such that the current sum is zero. That is, in FIG. 3, the current sum I2, I4, I6 indicated by the solid line is zero, and the current sum I1, I3, I5 indicated by the broken line is zero. It turns out that it becomes the object of. For this reason, the six bus bars are divided into two sets, a set of three bus bars through which currents I2, I4, and I6 flow and a set of three bus bars through which currents I1, I3, and I5 flow. And the feeder line structure of the rotary electric machine of this invention can be obtained by laminating | stacking three bus bars for each group through an insulating material.
[0022]
FIG. 4 shows an example in which the feeder line 103 serving as three bus bars is integrated with an insulating material 116. In the example shown in FIG. 4, the external magnetic field indicated by the broken line that is generated when the current sum of the three bus bars is not zero can be eliminated completely, and the generation of noise can be eliminated.
[0023]
FIG. 5 is a diagram showing the configuration of another example of the feeder line structure of the rotating electrical machine of the present invention. In the example shown in FIG. 5, the outer feeder line structure 101 is configured by integrating three feeder lines 103 serving as bus bars via an insulating material 116. Then, the periphery of the outer feeder structure 101 is covered with a conductive metal 121, and the conductive metal 121 and the rotating electrical machine case 122 are electrically and mechanically fixed with bolts 124. doing. By comprising in this way, while being able to exhibit the strong shielding effect with respect to an internal integrated bus bar, the support of an integrated bus bar is attained.
[0024]
In the example shown in FIG. 5, the mounting member 123 and the bolt 124 are supported in addition to the shield by the conductive metal 121, but the metal 121 is grounded only by the shield by the conductive metal 121. By connecting to the level, a shielding effect can be obtained. Although the integrated bus bar is attached to the case 122, it is needless to say that it can be attached to other members, for example, a support member of a rotating electrical machine.
[0025]
As mentioned above, although demonstrated based on the example of illustration, this invention is not limited to the above-mentioned example. For example, in the above-described example, six bus bars are divided into two sets of three, but the number of bus bars is not limited to six according to the state of the composite current to be supplied. The number of groups and the number of bus bars in each group are not limited to two or three, and may be other than two or three. In the above-described example, the example in which the feeder line structure of the rotating electrical machine of the present invention is applied to the outer feeder line structure 101 is shown, but it goes without saying that the rotary feeder may be applied to the inner feeder line structure 102. . However, since the place where the inner feeder line structure 102 is provided has more space than the place where the outer feeder line structure 101 is provided, usually a set of feeder lines structure in which six bus bars are integrated is provided. In many cases, the feeder line structure can be configured without applying and dividing the present invention.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view showing a composite current multilayer motor as an embodiment of a coaxial rotating electrical machine according to the present invention, which is combined with a Ravigneaux type planetary gear train to constitute a hybrid transmission for a vehicle.
FIG. 2 is a diagram showing a state viewed from the right side of FIG. 1 in order to explain an outer feeder line structure.
FIG. 3 is a (pseudo) phasor diagram of an example of a composite current supplied by the feeder line structure of the rotating electrical machine of the present invention.
FIG. 4 is a diagram showing an example of a configuration in which three bus bars are integrated.
FIG. 5 is a view showing another example of the feeder line structure of the rotating electrical machine of the present invention.
[Explanation of symbols]
101 Outer feeder line structure 102 Inner feeder line structure 103, 104 Feeder line 111 Terminal 112 Protective cover 113 Main body 114 External terminal 115 Mounting surface 116 Insulating material 121 Metal 122 Case 123 Mounting member 124 Bolt

Claims (3)

A plurality of armature coils constituting a stator of a rotating electric machine having a plurality of rotors driven by a composite current whose current sum is always zero are combined with a plurality of currents via a plurality of bus bars respectively corresponding to the plurality of armature coils. And a combination of bus bars for supplying the combined current divided into two or more groups , wherein the combined current is divided into two or more sets so that the total current in each set becomes zero. A feeder line structure for a rotating electrical machine, wherein a plurality of bus bars are selected and the bus bars are brought close to each other so as not to be electrically contacted and integrated with an insulating material. The feeder line structure for a rotating electrical machine according to claim 1, wherein the periphery of the integrated bus bar is covered with a conductive metal. The feeder line structure for a rotating electrical machine according to claim 2, wherein the conductive metal and a case or a support member of the rotating electrical machine are electrically and mechanically connected.

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