JP2007074879A - Power distributing member and module, which are used for motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide technology which is suitable for mounting a power element on a power distributing member integrated in a motor. <P>SOLUTION: Circular bus bars 40P, 40N, 40U, 40V and 40W integrated in the motor 20 are provided with circular bus bar main bodies 42P, 42N, 42U, 42V and 42W formed in almost circular shapes, and almost planar tab pieces 44P, 44N, 44U, 44V and 44W extended to an outer peripheral side from the circular bus bar main bodies 42P, 42N, 42U, 42V and 42W. Switching elements are mounted on the tab pieces 44P, 44N, 44U, 44V and 44W. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a motor power distribution member and a motor power distribution module for supplying power to a motor.

  Conventionally, there is a technique in which a central power distribution member having a ring-shaped bus bar is incorporated in a three-phase DC brushless motor, and wiring connection between a power source and a winding is performed using the central power distribution member. The ring-shaped bus bar is formed, for example, by bending a conductive metal plate material in a band shape into a substantially annular shape by curving it in the thickness direction.

  Such a technique is disclosed in Patent Document 1, for example.

JP 2003-134759 A

  Incidentally, in recent years, there has been a demand for downsizing and the like regarding power conversion devices mounted on electric vehicles such as hybrid vehicles and fuel cell vehicles. However, in the technique disclosed in Patent Document 1, it is necessary to provide a switching element that constitutes an inverter separately from a motor incorporating a ring-shaped bus bar. For this reason, there exists a tendency for the whole structure to enlarge.

  Accordingly, an object of the present invention is to integrate an inverter and a motor while reducing the size.

  A motor power distribution member according to the present invention is a motor power distribution member to be incorporated in a motor, and is formed so as to extend from the annular bus bar main body portion along the radial direction thereof. A tab piece is provided.

  A motor power distribution module according to the present invention is a motor power distribution module incorporated in a motor, and is extended from the annular bus bar main body portion formed in a substantially annular shape along the radial direction thereof. A plurality of power distribution members arranged substantially concentrically, and each tab piece is extended so as to be grouped into groups corresponding to elements to be mounted. .

  In this case, each said tab piece may be formed so that it may extend in the outer peripheral side rather than the power distribution member arrange | positioned in the outermost peripheral side.

  Or each said tab piece may be formed so that it may extend in the inner peripheral side rather than the power distribution member arrange | positioned in the innermost peripheral side.

  According to the motor power distribution member of the present invention, the motor power distribution member to be incorporated in the motor, the ring-shaped bus bar main body formed in a substantially annular shape, and extending from the ring-shaped bus bar main body along the radial direction thereof Since a tab piece is provided, a power element or the like can be easily mounted on the tab piece. Thereby, an inverter and a motor can be integrated, aiming at size reduction.

  According to the motor power distribution module of the present invention, the motor module has an annular bus bar main body portion formed in a substantially annular shape and a tab piece extending from the annular bus bar main body portion along the radial direction thereof, and is substantially concentric. Since a plurality of arranged power distribution members are provided, the power element can be easily mounted on each tab piece. In addition, since the tab pieces extend so as to be grouped in groups corresponding to the elements to be mounted, the power elements can be easily connected and mounted on the tab pieces of the power distribution member.

  Furthermore, when each tab piece is formed so as to extend to the outer peripheral side than the power distribution member disposed on the outermost peripheral side, a power element or the like can be mounted on the outermost peripheral side of the power distribution module. . Thereby, mounting of a power element etc. can be performed easily and the heat dissipation countermeasure etc. of a power element can also be performed easily.

  Further, when the tab pieces are formed so as to extend to the inner peripheral side with respect to the power distribution member disposed on the innermost peripheral side, the overall configuration can be reduced in size.

  Hereinafter, an annular bus bar as a motor power distribution member according to an embodiment of the present invention and a motor power distribution module including the same will be described.

  FIG. 1 is a block diagram showing an automobile to which a motor incorporating a motor power distribution module is applied. This motor power distribution module is a member for distributing power to a motor coil in the motor 20 incorporated in a travel motor 20 (for example, a three-phase DC brushless motor) of an electric vehicle including a hybrid vehicle and a fuel cell vehicle. is there.

  That is, in the electric vehicle, the battery 12 is connected to the boost converter 14 via the relay 13. The boost converter 14 boosts the DC voltage output from the battery 12 and provides the boosted voltage to the inverter circuit 30. The inverter circuit 30 converts the DC power from the battery 12 side to AC power and supplies power to the motor 20 under the control of an inverter control circuit 38 that is separate from the motor 20 and the inverter circuit 30.

  FIG. 2 is a circuit diagram showing an inverter circuit. In the present embodiment, a three-phase AC motor is assumed as the motor 20, and the inverter circuit 30 is configured as a three-phase inverter circuit that is a three-phase bridge circuit for driving the three-phase AC motor. That is, the inverter circuit 30 includes, as power elements, the high arm side switching elements 32a, 32b, 32c in the U phase, V phase, and W phase of the motor 20, and the low arm side switching elements 34a, 34b in each layer. , 34c. As these high arm side switching elements 32a, 32b, 32c and low arm side switching elements 34a, 34b, 34c, for example, various power switching elements such as a power MOSFET, a power junction transistor, and an IGBT are used. FIG. 2 shows a case where the switching elements 32a, 32b, 32c, 34a, 34b, and 34c are power MOSFETs.

  The drains of the high arm side switching elements 32a, 32b, and 32c are all connected to the plus (+) side power source, and their sources are connected to the drains of the low arm side switching elements 34a, 34b, and 34c of the same phase. The sources of the low arm side switching elements 34a, 34b, and 34c are all connected to the minus (−) side power source. The connection points between the sources of the high arm side switching elements 32a, 32b, and 32c and the drains of the low arm side switching elements 34a, 34b, and 34c are connected to the U phase, V phase, and W phase of the motor 20, respectively. The The gate terminals 33a, 33b, 33c, 35a, 35b, and 35c, which are control input terminals of the switching elements 32a, 32b, 32c, 34a, 34b, and 34c, are connected to the control signal output terminal of the inverter control circuit 38, respectively. ing. Then, the switching elements 32a, 32b, 32c, 34a, 34b, and 34c are turned on and off at a timing according to the control signal supplied from the inverter control circuit 38.

  The motor power distribution module according to this embodiment is integrated into the motor 20 and used as power supply wiring in the inverter circuit 30 as described above.

  FIG. 3 is an explanatory view showing an installation example of a motor power distribution module in the motor, FIG. 4 is an explanatory view showing a configuration example of the motor power distribution module, and FIG. 5 shows an example of an annular bus bar for supplying DC power. FIG. FIG. 6 is an enlarged perspective view of the main part of the motor power distribution module, FIG. 7 is an enlarged cross-sectional view of the main part of the motor power distribution module, and FIG. 8 is an enlarged plan view of the main part of the motor power distribution module.

  That is, when the inverter circuit 30 as described above is assumed, as a power supply wiring, a pair of annular bus bars 40P and 40N for DC power supply and a plurality of (three in this case, U, V, and W phases) are provided. The annular bus bars 40U, 40V, and 40W for supplying AC power are used. These annular bus bars 40P, 40N, 40U, 40V, and 40W constitute a motor power distribution module.

  These annular bus bars 40P, 40N, 40U, 40V, and 40W are provided with annular bus bar main body portions 42P, 42N, 42U, 42V, and 42W and substantially flat tab pieces 44P, 44N, 44U, 44V, and 44W.

  Each of the annular bus bar main body portions 42P, 42N, 42U, 42V, and 42W is a portion formed in a substantially annular shape. For example, a conductive plate material such as a metal plate is punched into a substantially strip shape, and this is along the thickness direction. It is formed by bending in an approximately annular shape. Here, the term “substantially annular” only needs to be formed in an approximately annular shape, and includes an annular shape having a partial cut as shown in FIGS. 4 and 5.

  The annular bus bar main body portions 42P, 42N, 42U, 42V, and 42W are formed in different diameters. And each cyclic | annular bus-bar 40P, 40N, 40U, 40V, 40W is arrange | positioned in the aspect arrange | positioned by the substantially concentric form on the substantially identical plane. Here, an example is shown in which the annular bus bars 40N, 40P, 40U, 40V, and 40W are arranged in this order from the outer peripheral side to the inner peripheral side. However, these arrangement orders may be changed as appropriate. Each of these annular bus bars 40P, 40N, 40U, 40V, and 40W is arranged in a concentric manner in this manner, and is formed of an insulating material such as an insulating resin on one end surface side of the motor 20 formed in a substantially cylindrical shape. It is held by the formed holder 28.

  The tab pieces 44P, 44N, 44U, 44V, and 44W are substantially rectangular plate-like portions that extend from the annular bus bar main body portions 42P, 42N, 42U, 42V, and 42W toward the outer peripheral side. The tab pieces 44P, 44N, 44U, 44V, and 44W have, for example, a substantially rectangular tongue-shaped portion that extends to the side when a conductive plate material such as a metal plate is punched in a substantially strip shape as described above. It is formed by being integrally formed and bent into a substantially L shape so as to extend radially outward of the annular shape of the annular bus bar main body portions 42P, 42N, 42U, 42V, 42W.

  These tab pieces 44P, 44N, 44U, 44V, and 44W are extended so as to be grouped into groups corresponding to the switching elements 32a, 32b, 32c, 34a, 34b, and 34c that are elements to be mounted. ing. More specifically, each tab piece 44P, 44N, 44U, 44V, 44W is arranged in the circumferential direction of each annular bus bar main body 42P, 42N, 42U, 42V, 42W for each group corresponding to the element to be mounted. These are extended from substantially the same position or adjacent positions, and extend in substantially the same direction along the radial direction of each of the annular bus bar main body portions 42P, 42N, 42U, 42V, 42W. Each tab piece 44P, 44N, 44U, 44V, 44W is formed so as to extend to the outer peripheral side from the annular bus bar 40N disposed on the outermost peripheral side.

  Here, as shown in FIGS. 6 to 8, tab pieces 44P, 44N, and 44U corresponding to the switching elements 32a and 34a in the U phase are extended so as to be aligned in substantially the same direction. The tab pieces 44P, 44N, 44U being aligned in substantially the same direction does not necessarily mean that the tab pieces 44P, 44N, 44U are completely aligned in the same direction, but electrically connecting the switching elements 32a, 34a in a manner described later. However, it also includes cases where it is uneven within the mountable range.

  The switching elements 32a and 34a are mounted on the tab pieces 44P, 44N and 44U. For example, the switching elements 32a and 34a are electrically and mechanically connected to the tab pieces 44P and 44N by soldering one of the electrodes to one main surface of the tab pieces 44P and 44N. Has been implemented. Further, other electrodes of the switching elements 32a and 34a are electrically connected to other tab pieces 44P, 44N and 44U as appropriate through a wiring member 60 such as a wire. Accordingly, the switching elements 32a and 34a are mounted so as to form a part of a predetermined three-phase inverter circuit and located on the outer peripheral side of the annular bus bar 40N disposed on the outermost peripheral side. Become.

  In other words, at least three tab pieces 44P, 44N, and 44U extend to the outer peripheral side so as to be substantially parallel to each other in substantially the same direction. The tab pieces 44P, 44N, 44U are electrically connected by the switching elements 32a, 34a, and the switching elements 32a, 34a are mounted to constitute a part of the three-phase inverter circuit 30. Like to do.

  As the switching elements 32a and 34a, any one of a pressure contact type, a bare chip type, a resin molded type, and the like may be used. Moreover, as an electrical connection mode between the switching elements 32a, 34a and the tab pieces 44P, 44N, 44U, in addition to the above example, a configuration in which another bus bar, a wiring board, or the like is used may be used.

  Similarly, the tab pieces 44P, 44N, 44V corresponding to the switching elements 32b, 34b in the V phase are extended so as to be aligned in substantially the same direction, and the switching elements 32b, 34b are mounted thereon. Further, tab pieces 44P, 44N, 44W corresponding to the switching elements 32c, 34c in the W phase are extended so as to be aligned in substantially the same direction, and the switching elements 32c, 34c are mounted thereon.

  In other words, the annular bus bar main body 42P, 42N, 42U, 42V, 42W is provided for each group connected to the switching elements 32a, 34a or 32b, 34b or 32c, 34c corresponding to each phase in the three-phase switching circuit. Each of the phase switching elements 32a, 34a or 32b, 34b or 32c, 34c is mounted so as to extend outward so as to be aligned in substantially the same direction. Thereby, a three-phase inverter circuit as shown in FIG. 2 is configured.

  In addition, the extended piece 46 extended in the radial direction outer side is formed in cyclic | annular bus-bar 40P, 40N (refer FIG. 5). DC power is supplied from the outside through the extended piece 46.

  According to the annular bus bars 40P, 40N, 40U, 40V, 40W and the motor power distribution module configured as described above, the annular bus bars 40P, 40N, 40U, 40V, 40W incorporated in the motor 20 are formed in a substantially annular shape. The annular bus bar main body portions 42P, 42N, 42U, 42V, 42W, and the substantially flat tab-like tab pieces 44P, 44N extending from the annular bus bar main body portions 42P, 42N, 42U, 42V, 42W to the outer periphery thereof. 44U, 44V, 44W, the switching elements 32a, 32b, 32c, 34a, 34b, 34c, etc. are easily mounted on one main surface of the tab pieces 44P, 44N, 44U, 44V, 44W. be able to. Thereby, an inverter and a motor can be integrated, aiming at size reduction.

  In addition, the tab pieces 44P, 44N, 44U, 44V, 44W are formed so as to extend to the outer peripheral side with respect to the annular bus bar 40N disposed on the outermost peripheral side, and therefore the switching elements 32a, 32b, 32c. , 34a, 34b, 34c can be mounted on the outermost peripheral side of the power distribution module. As a result, the annular bus bar main body portions 42P, 42N, 42U, 42V, 42W and the like are not easily obstructed, and mounting operations such as soldering of the switching elements 32a, 32b, 32c, 34a, 34b, 34c can be easily performed. Reliability can be improved. In addition, various heat dissipation measures can be taken for the switching elements 32a, 32b, 32c, 34a, 34b, and 34c provided on the outer peripheral side, and the degree of freedom of the heat dissipation measures is also improved.

  In the present embodiment, an example in which the tab pieces 44P, 44N, 44U, 44V, and 44W are extended to the outer peripheral side has been described, but they may be formed on the inner peripheral side. That is, in the present invention, the tab pieces 44P, 44N, 44U, 44V, 44W are configured to extend to the outer peripheral side or the inner peripheral side along the radial direction of the annular bus bar main body portions 42P, 42N, 42U, 42V, 42W. including. In particular, when the tab pieces 44P, 44N, 44U, 44V, and 44W are formed so as to extend further to the inner peripheral side than the annular bus bar main body 42W disposed on the innermost peripheral side, the annular bus bar main body Since the switching elements 32a, 32b, 32c, 34a, 34b, and 34c can be mounted on the inner peripheral side of the portions 42P, 42N, 42U, 42V, and 42W, there is an advantage that the entire configuration can be reduced in size.

It is a block diagram which shows the motor vehicle which applied the motor incorporating the cyclic | annular bus bar. It is a circuit diagram which shows an inverter circuit. It is explanatory drawing which shows the example of installation of the cyclic | annular bus bar in a motor. It is explanatory drawing which shows the structural example of the power distribution module for motors. It is a figure which shows an example of a cyclic | annular bus bar. It is a principal part expansion perspective view of the power distribution module for motors. It is a principal part expanded sectional view of the power distribution module for motors. It is a principal part enlarged plan view of the power distribution module for motors.

Explanation of symbols

20 Motor 32a, 32b, 32c, 34a, 34b, 34c Switching element 40P, 40N, 40U, 40V, 40W Annular bus bar 42P, 42N, 42U, 42V, 42W Annular bus bar body 44P, 44N, 44U, 44V, 44W Tab piece

Claims (4)

A power distribution member for a motor incorporated in a motor,
An annular bus bar main body formed in a substantially annular shape;
A tab piece extending along the radial direction from the annular bus bar body,
A power distribution member for motors. A power distribution module for a motor incorporated in a motor,
A plurality of power distribution members, each having a substantially annular ring-shaped bus bar body portion and a tab piece extending along the radial direction from the annular bus bar body portion;
Each of the tab pieces is a motor power distribution module that is extended so as to be grouped into groups corresponding to elements to be mounted. A power distribution module for a motor according to claim 2,
Each said tab piece is a power distribution module for motors formed so that it might extend in the outer peripheral side rather than the power distribution member arrange | positioned in the outermost peripheral side. A power distribution module for a motor according to claim 2,
Each said tab piece is a power distribution module for motors formed so that it might extend to the inner peripheral side rather than the power distribution member arrange | positioned at the innermost peripheral side.

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