JP6373746B2 - MOTOR AND ELECTRIC AND INTEGRATED MOTOR HAVING THE SAME - Google Patents

Description

  The present invention relates to a motor including a terminal connected to an ECU (electronic control device for controlling the motor), and an electromechanical integrated motor including the motor and the ECU.

  As a background art of this technical field, there is JP 2013-219933 A (Patent Document 1). This patent publication discloses a terminal connected to the ECU.

JP 2013-219933 A

  The terminal may be covered with resin to form a mold body (bus bar mold). However, if the terminal and the resin are in contact with each other on a flat surface, there is a possibility that the terminal and the resin will peel off due to pressure input generated when connecting to the ECU or heat shock due to excessive vibration or temperature change. There is. In the prior art such as Patent Document 1, such resin peeling has not been studied.

  Then, an object of this invention is to provide the motor which can reduce the resin peeling of the boundary of a terminal and resin, and an electromechanical integrated motor provided with the same.

  In order to solve the above problems, for example, the configuration described in the claims is adopted.

The present application includes a plurality of means for solving the above-described problems. For example, a motor having a terminal electrically connected to the ECU, wherein a part of the terminal is electrically connected to the coil. It is molded with a resin integrally with a terminal to be connected, and a projection is provided in a thickness direction of the terminal at a boundary portion between the terminal and the resin, and a tip projection is provided at a tip portion of the terminal, A tip projection is provided at a position corresponding to the projection in the longitudinal direction of the terminal .

  ADVANTAGE OF THE INVENTION According to this invention, the motor which can reduce the resin peeling of the boundary of a terminal and resin, and the electromechanically integrated motor provided with this can be provided.

  Problems, configurations, and effects other than those described above will become apparent from the description of the following examples.

The side view of a motor. Sectional drawing of the motor of FIG. FIG. The perspective view which fixed the bus-bar mold to the bearing case. The perspective view of an insert terminal. The perspective view after shaping | molding of an insert terminal. The top view of the lower mold | type of insert mold.

  Embodiments will be described below with reference to the drawings.

  In the following description, an electric power steering (hereinafter abbreviated as EPS) motor unit is used as an example of an electromechanical integrated motor.

  FIG. 1 is a side view showing only a motor portion (motor 100) of an EPS motor unit in which a motor and an ECU are integrated into an electromechanical unit. The motor 100 accommodates motor components in the housing 2, and a power transmission mechanism for driving a gear of the EPS system is configured through a pulley 1 and a belt (not shown) provided in the motor 100. Further, an ECU (not shown) is connected to the right side of the motor 100 in FIG. 1, and three-phase (U-phase, V-phase, W-phase) terminals 20u, 20v, 20w provided on the motor 100 side and the ECU side are electrically connected. It is a structure that is connected. A magnetic pole sensor 3 for detecting the magnetic pole position of the motor 100 is provided on the motor 100 side. A detection unit for the magnetic pole sensor 3 is provided on the ECU side so as to correspond to the magnetic pole sensor 3.

  FIG. 2 is a sectional view of the motor 100 shown in FIG. A shaft 6 is disposed at the center of the motor 100, and a pulley 1 is disposed at the tip thereof. An F rotor core 12 and an R rotor core 13 are provided at the center of the shaft 6. An F magnet 12m and an R magnet 13m are attached to each rotor core, and the outer periphery thereof is covered with a magnet cover. The rotor portion is supported by the F bearing 7 with respect to the housing 2, and the R bearing 8 is supported via a bearing case 9. The bearing case 9 is fixed to the housing with a bevel type tome 10 with respect to the housing 2.

  A coil 5 is wound around the stator core 4 inside the housing 2, and the coil constitutes a three-phase winding. The output end of the coil 5 is electrically connected to the terminal of the bus bar mold 14 fixed to the bearing case 9, and is finally electrically connected to the three-phase terminals 20u, 20v, and 20w. The magnetic pole sensor 3 is provided at the end of the shaft on the ECU side, and as described above, the magnetic pole position of the rotor can be detected by the detection unit (detection element) provided on the ECU side.

  FIG. 3 is a perspective view of the bus bar mold 14 described above. There are a total of four metal members forming the terminals, and these metal members are inserted into the bus bar mold 14. Since the motor winding is Y-connected, the neutral point connection terminals (neutral point connection terminals) 21w, 21v, 21u are configured to be exposed to the outside of the resin by one metal member. . Further, a terminal and a set of terminals (20u-20ut, 20v-20vt, 20w-20wt) each formed of three metal members that are electrically insulated from each other are exposed to the outside of the resin. The detailed structure of this terminal and terminal set will be described later with reference to FIG.

  Further, the bus bar mold 14 is provided with screw drop prevention walls 15a and 15b around a portion where the bus bar mold 14 is screwed. The screw drop prevention walls 15a and 15b are provided in the space formed by the screw drop prevention wall and the ECU side (for example, the wall surface of the ECU) so that the screws do not come out even when the screws are loosened and removed. The screw is held. The height of the screw drop prevention wall is determined according to the distance from the ECU so as to have a dimensional relationship such that the screw does not come out.

  FIG. 4 shows a structure in which the bus bar mold 14 is attached to the bearing case 9. The bus bar mold 14 is fixed to the bearing case 9 with screws 23a, 23b, and 23c. Screw drop prevention walls 15a and 15b are arranged around the screws 23b and 23c. Since the gap between the screw 23a and the ECU side is narrower than the effective length of the screw, no screw drop prevention wall is provided in this portion.

  FIG. 5 shows the shape of a W-phase metal member (terminal and terminal set) inserted into the bus bar mold 14. Regarding the shape of the metal member, the portion of the terminal 20w standing at a right angle (portion electrically connected to the ECU) has the same shape in all three phases. The configuration of this terminal will be described.

  A tip projection 22a is provided at the tip of the terminal 20w. The tip projection 22a has an electrically effective effect when connected to the ECU. A rear end projection is further provided at the position of the root portion of the terminal 20w corresponding to the front end projection 22a in the longitudinal direction of the terminal 20w.

  The rear end projection 22b will be described. When the tip projection 22a is inserted, it is necessary to make the mold so as to avoid the tip projection 22a. However, if the die is scraped, a gap is left in the holding portion of the terminal, making it impossible to mold. In general, it is necessary to divide the mold into two parts and to sandwich the terminals. However, there is a drawback that increases the cost of the mold. Therefore, when the same projection as the leading projection 22a is provided as the trailing projection, the required size is small, so that it is necessary to make it with high precision, resulting in an increase in cost. Further, when the terminal is set in the mold, there is a possibility that the tip projection 22a contacts the mold and the shape of the projection is deformed. Therefore, in the present invention, the rear end projection 22b is made larger than the size of the front end projection 22a provided at the front end of the terminal 20w so that the front end projection 22a does not come into contact with the mold when inserted into the mold. It is. Further, the rear end projection 22b has an elliptical shape in the axial direction so that the gap between the mold and the mold can be easily managed, and has a cross-sectional shape in which the shape of the contact surface with the mold is connected by a surface and R. The height direction is also higher than the height of the tip projection 22a.

  Regarding the W-phase terminal 20 wt, three portions of the crimping coil tip and the projections 20 wta and 20 wtb provided on the upper surface of the terminal with the coil interposed therebetween are electrically connected by welding. In this embodiment, the coil portion is not shown, but the width of the convex portion is approximately the same as the width of the two coils, and the two coils are crimped by the two convex portions provided on the terminals, By performing welding by aligning the positions of the convex portions so as to overlap, it is possible to perform welding with good quality. There is also an effect of preventing the opening of the terminal by providing two convex portions on the upper end portion of the terminal and melting both ends together with the coil.

  FIG. 6 shows the shape after resin molding when the rear end projection 22b described above is provided. The rear end projection 22b provided at the base of the W-phase terminal 20w has a convex shape on the front side in FIG. 6 on the left side of the drawing and a convex shape on the right side in the drawing on the right side. Therefore, the metal portion protrudes from the front side, and a boundary surface with the resin layer is formed at the boundary portion. On the other hand, since the recess on the terminal portion is formed on the other side, the resin is completely contained in the terminal. Thus, since the boundary surface with the resin enters the terminal in a complicated manner, it is possible to increase the strength against peeling of the resin and the metal compared to contact on a general plane. In addition, there is an effect that the wobbling with respect to the load when the terminal is incorporated in the ECU can be strengthened.

  FIG. 7 shows a part of the lower mold 25 of the actual insert mold. The lower mold is provided with a hole 26 for setting the terminal described above. Further, a projection escape portion 27 is provided so as not to contact the tip projection 22 a provided at the tip portion of the terminal 20. When the terminal is mounted on the mold, the terminal is inserted into the terminal insertion portion 26 from the front end portion of the terminal, and finally the upper mold is in a state where the rear end projection 22b and the projection escape portion 27 provided in the mold are matched. And is filled with resin. Therefore, if the gap in this portion is not maintained accurately, it will lead to the generation of burrs. Therefore, the dimensional accuracy of the terminal is obtained before molding, but it is necessary to sufficiently check.

  As described above, according to the present invention, by providing an uneven surface at the boundary between the resin and the terminal, the contact area between the resin and the terminal increases, and the resin enters into the recess of the terminal. It is possible to realize a simple coupling state and to suppress peeling and the like occurring at the boundary between the terminal and the resin against vibration and thermal fatigue.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

DESCRIPTION OF SYMBOLS 1 Pulley 2 Housing 3 Magnetic pole sensor 4 Stator core 5 Coil 6 Shaft 7 F bearing 8 R bearing 9 Bearing case 10 Bevel type Tomewa 11 O ring groove 12 F rotor core 13 R rotor core 12m F magnet 13m R magnet 14 Busbar mold 15a, b Screw drop-off Restraint wall
20u, 20v, 20w Terminal (U phase, V phase, W phase)
20ut, 20vt, 20wt Three-phase terminal 21u, 21v, 21w Neutral point terminal 22a Front projection 22b Rear end projection 23a, 23b, 23c Screw 24 Rib 25 Insert mold lower mold 26 Terminal insertion part 27 Projection escape part 100 EPS motor

Claims (5)

A motor having a terminal electrically connected to the ECU,
A part of the terminal is molded with resin integrally with a terminal electrically connected to the coil,
At the boundary between the terminal and the resin, a projection is provided in the thickness direction of the terminal ,
A tip projection at the tip of the terminal;
The motor in which the tip projection is provided at a position corresponding to the projection in the longitudinal direction of the terminal . The motor according to claim 1,
The shape of the projection is a motor extending in an elliptical shape in the longitudinal direction of the terminal. The motor according to claim 2,
A motor in which a thickness direction end surface of the projection is a flat surface, and the thickness direction end surface and the terminal surface of the terminal are connected in an R shape. The motor according to claim 1, wherein
The terminal comprises a plurality of the projections;
The projection has a convex shape and a concave shape when viewed from one side of the terminal.
A motor in which the resin enters a concave portion of the projection. A motor according to any one of claims 1 to 4 ,
An electromechanical integrated motor comprising: an ECU connected to the terminal.