JP4899819B2 - Power conversion device for motor / electric motor - Google Patents

Description

  The present invention relates to a power conversion device for an electromechanical integrated motor that integrally includes a motor and a power conversion device.

Conventionally, for example, a device described in Patent Document 1 is known as a power conversion device for an electromechanical integrated motor that integrally includes a motor and a power conversion device. In this power conversion device, a fan-shaped inverter module and a capacitor are accommodated in a motor casing to reduce the size of the drive device. The individual inverter modules and capacitors here are common to them. They are connected by an annular bus bar.
JP 2004-023877

  In such a conventional example, when a normal inverter module is used, each inverter module has two terminals of the P and N poles of the DC line and three terminals of the AC line, and these terminals have screw holes. Is formed. For this reason, in order to mount these inverter modules on the motor, a common P-pole bus bar and N-pole bus bar are required to connect the DC lines by fixing the individual inverter modules with screws. A common AC bus bar for connecting the motor coils is required.

  However, the bus bar is made of a copper material having good conductivity and has a large shape, and thus becomes heavy. Therefore, in the above configuration, there is a problem that the installation space of the bus bar and the structure for connecting the terminals become too large, and the motor-integrated power conversion device cannot be sufficiently reduced in size and weight.

  Furthermore, in the above configuration, the mounting position of the bus bar, inverter module, and capacitor is uniquely determined when assembling, so it is necessary to individually design the mounting position according to the structure layout on the load side. There is also a problem that the inverter cannot be configured with a flexible shape because it is not versatile, and there is no freedom in layout.

  The present invention has been made to solve the above-described problems, and the power conversion device for an electromechanical integrated motor according to the present invention is a power conversion device for an electromechanical integrated motor that integrally includes a motor and a power conversion device. And a plurality of inverter modules each having a protruding terminal and a fixed terminal, wherein the plurality of inverter modules are electrically connected by connecting the protruding terminal and the fixed terminal between the inverter modules adjacent to each other. And is arranged in an annular shape around the central axis of the motor.

  In such an electromechanical integrated motor power converter, the plurality of inverter modules of the power converter are electrically connected by connecting the protruding terminal and the fixed terminal between the inverter modules adjacent to each other. The power converter and the motor integral with the power converter are arranged around the central axis.

  Therefore, according to the power conversion apparatus for an electromechanical integrated motor of the present invention, a large annular bus bar for connecting a plurality of inverter modules to each other can be eliminated, and the number of parts can be reduced. It is possible to reduce the material cost and reduce the size and weight of the body power converter.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Here, FIGS. 1A and 1B are a longitudinal sectional view including a central axis and a line AA in FIG. 1A of the first embodiment of the power converter for an electromechanical integrated motor of the present invention. 2A, 2B, and 2C are a plan view, a side view, and a perspective view showing each inverter module of the power conversion device for an electromechanical integrated motor according to the first embodiment. In the figure, reference numeral 1 denotes the power conversion device for an electromechanical integrated motor of the first embodiment.

  As shown in FIG. 1, the power conversion device 1 for an electromechanical integrated motor of the first embodiment is disposed integrally with an electromechanical integrated motor 2, and the electromechanical integrated motor 2 is a front case. 3a, an intermediate case 3b and a rear case 3c, and a rotor 5 which is rotatably supported by a front case 3a and a rear case 3c of the motor case 3 via bearings 4 and has a permanent magnet. And a plurality of (eight in the figure) stators 7 each fixed to the inside of the intermediate case 3b so as to surround the rotor 5 and having coils 6 respectively. 5 is rotated.

  The motor-integrated power conversion device 1 according to the first embodiment includes a DC connector 8 provided through a rear case 3c of the motor case 3 and supplied with a current from a DC power source (not shown) such as a battery, and a rear case. A smoothing capacitor 9 that is fixed inside 3c and smoothes the direct current, and an inward flange 3d that protrudes radially inward from the end of the intermediate case 3b of the motor case 3 facing the rear case 3c. The inverter module 10 includes a plurality of (8 in the figure) inverter modules 10 that are fixed to the outer surface covered with the rear case 3c and convert the smoothed DC current into AC current. 10 is connected by a wire 11 which is wire-bonded.

  Here, the plurality of inverter modules 10 are provided, for example, in the same number as the number of coils 6 of the stator 7 arranged in an annular shape of the electromechanical integrated motor 2, and around the central axis C of the rotor 5 of the electromechanical integrated motor 2. The AC / DC motor 2 is operated as an AC motor by supplying AC currents, which are arranged in an annular shape, and supplied to a plurality of coils 2, for example, adjacent coils with phases shifted from each other by a predetermined angle.

  In the figure, eight coils 6 and eight inverter modules 10 are provided, but six of them may be provided. In this case, a three-phase AC motor having a U phase, a V phase, and a W phase is configured. Thus, the six inverter modules 10 correspond to the phases U1, U2, V1, V2, W1, and W2, respectively. For example, the semiconductor elements of the two inverter modules 10 that energize U1 and U2 are simultaneously turned on and off. Will do. If the two inverter modules 10 are arranged so as to be parallel in terms of current with respect to one phase of the AC motor in this way, the heat generation of the inverter module 10 can be dispersed. It is desirable to arrange one inverter module 10 per motor slot (one coil in the distributed winding coil).

  As shown in FIGS. 2A and 2B, each inverter module 10 includes a P-pole protruding terminal (hole) 12 and an N-pole protruding terminal (hole) 13, and a P-pole fixed terminal (screw). 2) and an N-pole fixed terminal (with screw hole) 15, and as shown in FIG. 2 (c), a P-pole protruding terminal (hole opening) 12 and a P-pole fixed terminal (with screw hole) ) 14 and directly connected to the upper arm (switch + diode) 16 of the inverter by wire bonding or the like, and an N-pole protruding terminal (hole opening) 13 and an N-pole fixed terminal (with screw hole) 15 Are connected directly to the lower arm (switch + diode) 17 of the inverter by wire bonding or the like, so that when the inverter modules 10 are arranged, the P and N pole protruding terminals 12 and 13 are next to Respectively to the P and N electrodes of the fixed terminals 14 and 15 of the down converter module 10 is screwed. By connecting a plurality of inverter modules 10 in this way, the inverter module 10 becomes annular, and all the inverter modules 10 are electrically connected to each other and are also electrically connected to the smoothing capacitor 9.

  Therefore, according to the power conversion device 1 for an electromechanical integrated motor of the first embodiment, a large annular bus bar for connecting a plurality of inverter modules 10 to each other can be eliminated, and the number of parts can be reduced. Thereby, the material cost reduction of the motor integrated power converter device 1 and reduction in size and weight can be achieved.

  Each inverter module 10 has two coil terminals 18 that can be directly connected to the coil 6 connected to the upper and lower arms (switch + diode) 16 and 17 of the inverter by wire bonding or the like.

  Therefore, according to the power conversion apparatus 1 for an electromechanical integrated motor of the first embodiment, an AC bus bar for connecting to the coil is not required, and each coil 6 can be easily connected to each inverter module 10. Further, since an AC bus bar is not required, the number of parts can be reduced in this respect, thereby enabling reduction in material cost and reduction in size and weight of the motor-integrated power conversion device 1.

  FIG. 3 is a sectional view at the same position as FIG. 1 (b), showing a second embodiment of the power conversion device for an electromechanically integrated motor of the present invention. FIGS. 4 (a) and 4 (b) It is the top view and side view which show each inverter module of the power converter device for electromechanical integrated motors of 2 Example, In the figure, the code | symbol 21 shows the power converter device for electromechanical integrated motors of the said 2nd Example, Portions similar to those in the previous embodiment are denoted by the same reference numerals.

  The power conversion device 21 for the electromechanical integrated motor of the second embodiment is also arranged integrally with the motor 3 having the same configuration as that of the first embodiment, and the electromechanical integrated motor of the second embodiment. As shown in FIGS. 4A and 4B, in the power converter 21 for an inverter, in each inverter module 10, the P-pole protruding terminal 12 and the N-pole protruding terminal 13 overlap each other with a gap therebetween. In addition, the P-pole fixed terminal 14 and the N-pole fixed terminal 15 are positioned so as to overlap each other with a gap therebetween. Insulating the fixing screw from the N-pole projecting terminal 13 and the N-pole fixed terminal 15 by sufficiently enlarging the screw hole with the N-pole fixed terminal 15 and passing the flanged insulation bush as an insulating element. , N pole fixed end By providing an insulating film as an insulating element on the lower surface of 15, the P and N poles are insulated and the two protruding terminals 12 and 13 are fixed to the two fixed terminals 14 and 15 with the same screw. ing. Other configurations and operations are the same as those of the power conversion device 1 for an electromechanical integrated motor of the first embodiment (see FIGS. 1 and 2).

  According to the power conversion device 21 for an electromechanical integrated motor of the second embodiment, in addition to the same effects as the first embodiment, the positions of the two protruding terminals 12 and 13 are concentric. Since it becomes possible to change and fix the angle between the adjacent inverter modules 10, the layout at the time of the connection of the inverter modules 10 can be freely configured. In addition, since the two protruding terminals 12 and 13 can be fixed with the same screw, the number of work steps for fixing the protruding terminals 12 and 13 can be halved.

  FIG. 5 (a) is a cross-sectional view at the same position as FIG. 1 (b), showing a third embodiment of the power conversion device for an electromechanical integrated motor of the present invention, and FIG. 5 (b) and FIG. FIGS. 6A and 6B are cross-sectional views respectively showing two modifications of the power conversion device for an electromechanical integrated motor of the third embodiment, and FIGS. 6A and 6B show the electromechanical integrated motor of the third embodiment and the modified example. It is the top view and side view which show the modification of each inverter module which can be used for the power converter for vehicles, In the figure, the code | symbol 31 shows the power converter for electromechanical integrated motors of the said 3rd Example and its modification The same parts as those in the previous embodiment are denoted by the same reference numerals.

  The power conversion device 31 for an electromechanical integrated motor of the third embodiment shown in FIG. 5A is also arranged integrally with the motor 3 having the same configuration as that of the first embodiment. In the power conversion device 31 for an electromechanical integrated motor of the embodiment, in each inverter module 10, the P-pole projecting terminal 12 and the N-pole projecting terminal 13 overlap each other with a gap, as in the second embodiment. The P-pole fixed terminal 14 and the N-pole fixed terminal 15 are positioned so as to overlap each other with a space therebetween, and the fixed terminals 14, 15 of the casing 10 a of each inverter module 10. The corners of the end portions in the vicinity in the longitudinal direction are formed by rounding into an arc shape. The plurality of inverter modules 10 are arranged in a direction in which the longitudinal end portions of the housing 10a where the protruding terminals 12 and 13 and the fixed terminals 14 and 15 are provided are positioned radially inward of the motor 3, Are connected to each other. Other configurations and operations are the same as those of the power conversion device 21 for an electromechanical integrated motor of the second embodiment (see FIGS. 3 and 4).

  According to the power conversion device 31 for an electromechanical integrated motor of the third embodiment, the protruding terminals 12 and 13 are located inward in the radial direction of the motor 3 in addition to the same effects as the second embodiment. Therefore, since the length of the protruding terminals 12 and 13 is shortened, it is possible to reduce the material cost and reduce the size and weight of the motor. In addition, since the corners of the longitudinal ends of the casing 10a of each inverter module 10 in the vicinity of the fixed terminals 14 and 15 are rounded in an arc shape, the clearance at the time of connecting the inverter modules 10 is increased. Matching can be facilitated, and the workability of assembling the inverter module 10 can be improved.

  FIG. 5B shows a modified example of the power conversion device for an electromechanical integrated motor of the third embodiment. In the third embodiment, six inverter modules 10 are arranged in a circle and a six-phase AC motor is arranged. Alternatively, a three-phase AC motor in which two coils 6 are assigned to each phase is configured. However, in this modification, 12 inverter modules 10 are arranged in a circle to form a 12-phase AC motor or two coils 6 for each phase. 6-phase AC motors assigned one by one are configured.

  FIG. 5C shows another modification of the power conversion device for an electromechanical integrated motor according to the third embodiment. In this modification, two inverter modules 10 are juxtaposed in two to form a hexagon. It is arranged to constitute a 12-phase AC motor or a 6-phase AC motor in which two coils 6 are assigned to each phase. In this way, a plurality of inverter modules 10 may be arranged in a polygonal shape.

  In the modification of the inverter module 10 shown in FIGS. 6A and 6B, in each inverter module 10, the P-pole projecting terminal 12 and the N-pole projecting terminal 13 further halve their tips. In addition to being formed into a circular shape, elongated holes 12a, 13a are formed in the P-pole projecting terminal 12 and the N-pole projecting terminal 13 along the extending direction thereof over substantially the entire length of the projecting terminals. Has been. Thereby, since the distance and angle between the adjacent inverter modules 10 can be changed more easily, the layout at the time of connection can be configured more freely.

  FIGS. 7A and 7B are a plan view and a side view showing each inverter module in the fourth embodiment of the power conversion device for an electromechanical integrated motor of the present invention. 4 shows a power conversion device for an electromechanical integrated motor according to a fourth embodiment, and the same parts as those in the previous embodiment are denoted by the same reference numerals.

  In the electromechanical integrated motor power conversion device 41 of the fourth embodiment, as shown in FIGS. 7A and 7B, in each inverter module 10, a P-pole protruding terminal 12 and an N-pole protruding terminal are provided. 13 are configured as cable terminals having cables 12b and 13b, respectively, a P-pole fixed terminal 14 and an N-pole fixed terminal 15 are juxtaposed with each other, and the casing 10a of each inverter module 10 is further arranged. Are formed by rounding the corners of the end portions in the longitudinal direction in the vicinity of the fixed terminals 14 into an arc shape. Other configurations and operations are the same as those of the power conversion device 1 for an electromechanical integrated motor of the third embodiment (see FIG. 5).

  According to the power conversion device 41 for a motor-integrated motor of the fourth embodiment, the fixing direction of the inverter module 10 can be made flexible in addition to the same effects as those of the third embodiment. 10 can be installed by extending in the axial direction of the motor 3 or extending in the radial direction, so that the layout performance of the power converter is improved and can be adapted to various motor forms. . Moreover, the inverter module 10 can be generalized, and the cost of the inverter module 10 can be reduced due to the mass production effect.

  FIG. 8 is a cross-sectional view at the same position as FIG. 1 (b) showing a fifth embodiment of the power conversion device for an electromechanical integrated motor of the present invention. In the figure, reference numeral 51 denotes the fifth embodiment. An example of a power conversion device for an electromechanical integrated motor is shown, and the same parts as those in the previous embodiment are denoted by the same reference numerals.

  The power conversion device 41 for the motor / electrically integrated motor of the fifth embodiment is the same as that in the power converter 21 for the motor / electrically integrated motor of the second embodiment shown in FIGS. , V-phase, and W-phase) inverter modules 10, and four projecting external parts each having protruding terminals 12 and 13 and fixed terminals 14 and 15 having the same configuration as that of the inverter module 10. The capacitor module 19 and one power supply terminal module 20 are provided. The capacitor module 19 corresponds to the smoothing capacitor 9, and the power supply terminal module 20 corresponds to the DC connector 9.

  As shown in FIG. 2, each inverter module 10, each capacitor module 19, and power supply terminal module 20 includes a P-pole protruding terminal (hole) 12, an N-pole protruding terminal (hole) 13, It has a fixed terminal (with screw hole) 14 and an N-pole fixed terminal (with screw hole) 15, and the P-pole protruding terminal (hole opening) 12 and the P-pole fixed terminal (with screw hole) 14 are directly connected. The N-pole projecting terminal (hole opening) 13 and the N-pole fixed terminal (with screw hole) 15 are also directly connected to each other, so that when the inverter module 10, the capacitor module 19 and the power supply terminal module 20 are arranged. In addition, the P-pole and N-pole protruding terminals 12 and 13 are connected to the P-pole and N-pole fixed terminals 14 and 15 of the adjacent inverter module 10 or the capacitor module 19 or the power supply terminal module 20, respectively. Respectively are screw fixed. In this way, the inverter module 10, the capacitor module 19, and the power supply terminal module 20 are connected to form an annular shape so that all the inverter modules 10 are electrically connected to each other and the capacitor module 19 and the power supply terminal module 20 are connected. Both are electrically connected.

  According to the power conversion device 51 for an electromechanical integrated motor of the fifth embodiment, in addition to the same effects as those of the second embodiment, the power terminal module 20 and the smoothing capacitor 19 as external components are connected to the inverter module. Since it is connected and incorporated in the same manner as in FIG. 10, various combinations can be made possible depending on the application, and the power conversion device can be multi-functional and have high performance.

    Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described example. For example, in the third embodiment, the tip portions of the protruding terminals 12 and 13 are rounded for all of the plurality of inverter modules 10. However, as shown in FIG. 5C, for example, when two inverter modules 10 are juxtaposed, the tip ends of the protruding terminals 12 and 13 of one of the inverter modules 10 are rounded. Instead, it may remain square as shown in FIG. Similarly, in the third embodiment, the end of the housing 10a is rounded for all of the plurality of inverter modules 10, but two inverter modules 10 are juxtaposed, for example, as shown in FIG. 5C. In the case of such a configuration, the end of the casing 10a of one of the inverter modules 10 may not be rounded. And in the said 4th Example, although the protruding terminals 12 and 13 were made into the cable terminal about all the some inverter modules 10, the inverter module 10 which has plate-shaped protruding terminals 12 and 13 there as shown in FIG. You may mix.

  Thus, according to the power conversion device for a motor-integrated motor of the present invention, a large annular bus bar for connecting a plurality of inverter modules to each other can be eliminated, and the number of parts can be reduced. It is possible to reduce the material cost and reduce the size and weight of the power conversion device.

  In the power conversion device for an electromechanical integrated motor of the present invention, each inverter module has a plurality of each of the protruding terminals and the fixed terminals, and the plurality of protruding terminals are between the protruding terminals. The fixing terminal has a gap into which the protruding terminal can be inserted and has an insulating element that prevents conduction between the protruding terminals. The plurality of fixing terminals also have a gap into which the protruding terminal can be inserted between the fixing terminals. You may have the insulation element which prevents conduction between those fixed terminals, and since the position of two protruding terminals will become concentric in this way, it is possible to change and fix the angle between adjacent inverter modules. Therefore, the layout when connecting the inverter modules can be freely configured. In addition, since the two protruding terminals can be fixed with the same screw, the number of work steps for fixing the protruding terminals can be halved.

  Further, in the power conversion device for an electromechanical motor according to the present invention, each inverter module has the protruding terminal and the fixed terminal at an end of the inverter module housing near the central axis. In this way, since the protruding terminal is positioned inward in the radial direction of the motor, the length of the protruding terminal is shortened, so that the material cost can be reduced and the motor can be reduced in size and weight. .

  Furthermore, in the power conversion device for an electromechanical motor according to the present invention, at least one of the plurality of inverter modules may be formed by rounding an end portion of the casing near the fixed terminal. By doing so, since the clearance at the time of connecting the inverter modules is increased, the alignment can be facilitated, and the workability of assembling the inverter modules can be improved.

  Furthermore, in the power conversion device for an electromechanical integrated motor according to the present invention, at least one of the plurality of inverter modules is formed by rounding a tip end portion of the protruding terminal and extends along the extending direction of the protruding end portion. A long hole may be formed, and in this way, the distance and angle between adjacent inverter modules can be changed more easily, so that the layout at the time of connection can be configured more freely.

  Furthermore, in the electric power converter for an electromechanical integrated motor of the present invention, at least one of the plurality of inverter modules may have a power cable terminal as the protruding terminal. Since the fixing direction can be made flexible, the same inverter module can be installed by extending it in the axial direction of the motor or extending in the radial direction, improving the layout performance of the power converter and various Can be adapted to any motor configuration. Further, the inverter module can be generalized, and the cost of the inverter module can be reduced by mass production effect.

  Furthermore, in the power conversion device for an electromechanical integrated motor according to the present invention, in addition to the plurality of inverter modules, a projecting terminal and a fixed terminal respectively connected to the fixed terminal and the projecting terminal of the inverter module are included. Capacitor modules may be provided, and in this way, the capacitor modules are connected and incorporated in the same manner as the inverter module, so that various combinations can be made possible depending on the application, and the power conversion device can be multifunctional. And high performance.

  In the power conversion device for an electromechanically integrated motor according to the present invention, each inverter module may have a coil terminal to which the coil of the motor is connected. In this way, the inverter module is connected to the coil. The AC bus bar is not required, and each coil can be easily connected to each inverter module. Further, since an AC bus bar is not required, the number of parts can be reduced in this respect, and thereby, it is possible to reduce the material cost and reduce the size and weight of the motor-integrated power conversion device.

(A), (b) is a longitudinal cross-sectional view including a central axis of the first embodiment of the power conversion device for an electromechanical integrated motor of the present invention, and a cross-section along the line AA in (a). FIG. (A), (b), (c) is the top view, side view, and perspective view which show each inverter module of the power converter device for electromechanical integrated motors of the said 1st Example. It is sectional drawing in the position similar to FIG.1 (b) which shows 2nd Example of the power converter device for electromechanical motors of this invention. (A), (b) is the top view and side view which show each inverter module of the power converter device for electromechanical integrated motors of the said 2nd Example. (A) is sectional drawing in the position similar to FIG.1 (b) which shows 3rd Example of the power converter device for electromechanical integrated motors of this invention, (b), (c) is the 3rd. It is sectional drawing which shows each of the two modifications of the power converter device for electromechanical integrated motors of an Example. (A), (b) is the top view and side view which show the modification of each inverter module which can be used for the power converter device for electromechanical integrated motors of the said 3rd Example and its modification. (A), (b) is the top view and side view which show each inverter module in 4th Example of the power converter device for electromechanical integrated motors of this invention. It is sectional drawing in the position similar to FIG.1 (b) which shows 5th Example of the power converter device for electromechanical integrated motors of this invention.

Explanation of symbols

1, 21, 31, 41, 51 Power conversion device for electro-mechanical integrated motor 2 Electro-mechanical integrated motor 3 Motor case 3a Front case 3b Intermediate case 3c Rear case 3d Inward flange 4 Bearing 5 Rotor 6 Coil 7 Stator 8 DC connector 9 Smoothing capacitor 10 Inverter module 10a Housing 11 Wire 12, 13 Protruding terminal 12a, 13a Long hole 12b, 13b Cable 14, 15 Fixed terminal 16 Upper arm 17 Lower arm 18 Coil terminal 19 Capacitor module 20 Power supply terminal module C Central axis

Claims (8)

A power conversion device for an electromechanical integrated motor that integrally includes a motor and a power conversion device,
A plurality of inverter modules each having a protruding terminal and a fixed terminal;
The plurality of inverter modules are electrically connected by connecting the projecting terminal and the fixed terminal between the inverter modules adjacent to each other, and are arranged annularly around the central axis of the motor. A power conversion device for an electromechanical integrated motor, which is characterized by Each inverter module has a plurality of each of the protruding terminals and the fixed terminals,
The plurality of protruding terminals have a gap between which the fixed terminals can be inserted, and an insulating element that prevents conduction between the protruding terminals.
2. The plurality of fixed terminals also have an insulating element that has a gap into which the protruding terminal can be inserted between the fixed terminals and prevents conduction between the fixed terminals. Power conversion device for motor-integrated motors.   The electric power for an electro-mechanically integrated motor according to claim 1, wherein each inverter module has the protruding terminal and the fixed terminal at an end portion of the inverter module housing near the central axis. Conversion device.   The at least one of the plurality of inverter modules is formed by rounding a tip end portion of the protruding terminal, and an elongated hole along the extending direction is formed in the protruding end portion. The power conversion device for an electromechanical integrated motor according to any one of 1 to 3.   5. The electromechanical device according to claim 1, wherein at least one of the plurality of inverter modules is formed by rounding an end portion of the casing near the fixed terminal. 6. Integrated motor power converter.   6. The power conversion device for an electromechanical integrated motor according to claim 1, wherein at least one of the plurality of inverter modules has a power cable terminal as the protruding terminal. 7.   The capacitor module having a protruding terminal and a fixed terminal connected to the fixed terminal and the protruding terminal of the inverter module, respectively, in addition to the plurality of inverter modules. The power conversion device for an electromechanical integrated motor according to any one of the preceding items.   8. The electro-electrically integrated motor power conversion device according to claim 1, wherein each inverter module has a coil terminal to which a coil of the motor is connected. 9.

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