JPH0753408Y2 - Motor drive unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a structure of a motor drive unit accommodating electric parts used for controlling an AC electric motor.

[Prior Art] Controllers for AC motors used in machine tools, etc.
The control printed circuit board with capacitors and resistors mounted on the printed circuit board and the power circuit board with power components such as electromagnetic contactors and power transistors are stacked.
The power board is such that, for example, as shown in JP-A-63-157635, soldering connection parts are arranged on one surface of the board, and screw connection parts are attached to the other surface. The electric power board and the control printed board are assembled by screwing them to a synthetic resin frame at intervals larger than the height of the electric parts attached to the board.

[Problems to be solved by the invention] For this reason, it is necessary to mount the power board by soldering as well as mounting by screwing or terminal connection, and when soldering, mask the screw connection hole, When screwing, it was difficult to work due to soldered parts, etc., which required a lot of work, and connection with the control board was troublesome.

In addition, there are drawbacks in that the mounting position of each power module and the mutual positioning of the boards also require labor, resulting in poor workability and a large overall height.

It is an object of the present invention to eliminate soldering between a power component and a power board, ensure the positioning of the power component and each board, and facilitate automatic assembly.

[Means for Solving the Problems] According to the present invention, a control printed circuit board provided with a control component, a connector having a socket connected to the control component and a guide hole, and a power component are provided on one side. A power board with external connection terminals connected to the screw terminals of power parts on one side edge, and a die-cast case with cooling fins and power parts that require cooling. Provide connector pins and guide pins to which terminals other than screw terminals are connected to the power parts, and install these connector bins and guide pins on the control printed circuit board through the connector pin insertion holes and guide pin insertion holes provided on the power board. Inserted into the socket and guide hole of the connector, tighten the control printed circuit board to the die-cast case with the power circuit board in between. It is assembled.

[Operation] Therefore, the power component is electrically connected to the control printed circuit board by the connector pin, and there is no need to solder on the power substrate surface, and the power component, the power substrate, and the control are controlled by the guide pin. The printed circuit boards are positioned relative to each other, the power components are attached to the die-cast case, the power components are screwed to the power circuit boards, and the control printed circuit boards are stacked to position and tighten each other. Can be assembled and fixed.

[Embodiment] An embodiment of the present invention shown in the drawings will be described below. In this embodiment, the number of parts is reduced to simplify the explanation.

Reference numeral 1 is a control printed circuit board, on which control parts 11 such as a control semiconductor element, a capacitor, and a resistor are attached, and necessary connections are made by printed wiring. 12 and 13 are connectors attached to the lower surface of the printed circuit board 1, which are provided with a plurality of sockets 14 as shown in FIG.
It has fifteen. 16 is a board mounting hole provided in the control printed board, and 17 and 18 are tightening screws.

Reference numeral 2 is a power board on which power parts such as the power transistor 3 and the power module 4 arranged on the lower surface are screws 21 and 22.
Can be installed with. Reference numeral 23 is a stud terminal for mechanically connecting the power components and the control printed circuit board 1 to the power substrate 2 and for making an electrical connection, and 24 is a pin insertion hole for inserting the connector pin 31 of the power transistor 3,
25 is a guide insertion hole for inserting the guide pin 32 of the power transistor 3, 26 is a connector pin insertion hole for inserting the connector pin 41 provided in the power module 4, and 27 is a guide pin.
42 is a guide pin insertion hole, 28 is a screw insertion hole for fastening the screw terminal 33 of the power transistor 3 to the power board 2, 29 is a screw insertion hole of the screw 22 for attaching the power module 4 to the power board 2, 34・ 35 is a power transistor 3
Each of the mounting holes is provided at a diagonal position, and 35 has a large diameter, and a bushing 36 is inserted as shown in FIG. 5 is a terminal for external connection provided on one side edge of the power board 2,
51 is a screw.

6 is a die-cast case, which is integrally provided with a cooling fin 61 on the lower surface, and which has a mounting surface 62 and a mounting screw hole 6 for the power transistor 3.
3, a board mounting hole 64, a positioning projection 65 for mounting the electromagnetic contactor 7, a screw mounting projection 66 for positioning the external connection terminal 5, a case mounting hole 67, a duct ventilation type mounting hole 68 (not shown), A counterbore hole 69 is provided in the mounting screw hole at a diagonal position of the mounting screw hole 63.

Next, the assembly will be described.

The power transistor 3 is mounted on the mounting surface 62 of the die casting case 6, and the bushing 36 is provided in the mounting hole 35 at a diagonal position. The tip of the bushing projects from the lower surface of the power transistor. It is inserted into the hole 69 for positioning, and is fixed by tightening the screw 37. The electromagnetic contactor 7 has a positioning hole (not shown) provided on the bottom surface thereof for positioning the projection 65 of the die casting case 6.
It is inserted and positioned.

The guide pins 42 of the power module 4 are inserted into the guide pin insertion holes 27 of the power board 2 to position the connector pins.
Insert 41 into the connector pin insertion hole 26 and insert the screw 22 into the screw hole 29.
Attach via.

The guide pin 32 of the power transistor 3 is inserted into the guide pin insertion hole 25 and the connector pin insertion hole 24 of the power board 2.
And the connector pin 31, and the positioning holes (not shown) on both sides of the lower surface of the external connection terminal 5 are fitted to the screw mounting protrusions 66 of the die casting case 6 for positioning.
Attach with screws 51.

Further, the control printed board 1 is placed on the power board 2, and the guide pins 15 and 32 are inserted into the guide holes 15 for positioning, and the connector pins 31 and 41 are inserted into the sockets 14 of the connectors 12 and 13. Connecting.

When the power board 2 and the control printed board 1 are piled up in this way, they are surely positioned in the die casting case 6, respectively, and the board mounting holes 16 and
Tighten and fix the whole through 64.

[Effects of the Invention] As described above, according to the present invention, the control printed circuit board 1 is provided with the control component for controlling the AC motor, the socket connected to the control component, and the connector having the guide hole. A die casting case 6 with power components attached to one surface with screws, external connection terminals connected to the screw terminals of the power components on the side edges, and cooling power provided with power components requiring cooling is attached. Along with the provision, connector pins connected to terminals other than screw terminals and guide pins are provided on both sides of the power component, and this connector bin and guide pin are passed through the connector pin insertion hole and the guide pin insertion hole provided on the power board. Insert it into the connector of the control printed circuit board, clamp the power printed circuit board and fix the control printed circuit board to the die-cast case. Therefore, power components such as power transistors are screwed to one side of the power board, and connections other than screws for this power component are connected to the connector of the control printed circuit board with connector pins. It is possible to eliminate the soldering, and it is possible to reduce the distance between the control printed circuit board and the power circuit board, thereby making the entire size small.

Further, the guide pin provided on the power component can be inserted through the guide pin insertion hole of the power substrate into the guide hole of the control printed circuit board to easily and reliably perform positioning,
Further, by providing a bushing projecting on the mounting surface in the mounting hole of the power component mounted on the mounting surface of the die casting case, the proper mounting position can be easily moved by moving the power component on the mounting surface of the die casting case. Can be detected.

In this way, soldering work becomes unnecessary, and the motor drive unit can be configured by mounting the power components in the die-casting case and positioning and stacking the boards in order while stacking them together, facilitating automatic assembly by a robot. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, and FIG. 2 is a partial side sectional view for explanation. 1 is a control printed circuit board, 2 is a power board, 3 is a power transistor, 4 is a power module, 5 is an external connection terminal, 6 is a die-cast case, 11 is a control part, 12
・ 13 is a connector, 14 is a socket, 15 is a guide hole, 16 is a board mounting hole, 24 and 26 are connector pin insertion holes, 25 and 27 are guide pin insertion holes, 31 and 41 are connector pins, and 32 and 42 are guides. Pin, 36 is a bushing, 61 is a cooling fin, 62 is a mounting surface,
63 is a mounting screw hole, 64 is a board mounting hole, and 69 is a counterbore hole.

Claims (2)

[Scope of utility model registration request] 1. A control printed circuit board provided with a control part for controlling an AC electric motor and provided with a connector having a socket connected to the control part and a guide hole.
Power components are attached to one side with screws, and one side edge has a power substrate with an external connection terminal that is connected to the screw terminals of the power component and a cooling fin. Equipped with a die-casting case, the connector for power and the connector pins connected to terminals other than screw terminals are provided on the power component, and the connector pin and guide pin are provided on the power substrate for the connector pin insertion hole and the guide pin insertion hole. The motor drive unit is characterized in that the control printed circuit board is inserted into the socket and the guide hole of the connector provided on the control printed circuit board, and the control printed circuit board is clamped and fixed to the die-cast case with the power circuit board sandwiched therebetween. 2. A mounting screw hole provided on a mounting surface of the die casting case is provided with a counterbore hole, and a mounting member for a power component mounted on the mounting surface is provided with a bushing for inserting a tip into the counterbore hole. The described motor drive unit.