CN115967213A - Motor and electric actuator - Google Patents

Abstract

The invention provides a motor and an electric actuator. The motor has: a rotor that can be rotated by a rotating shaft; a stator having a core disposed so as to face the rotor, and a coil formed by winding a wire around a part of the core, a lead-out portion of the coil being a part of the wire being led out from the core to one side in an axial direction in which the rotation axis extends; a housing that houses the rotor and the stator therein; an insulating case disposed on one side with respect to the housing, the insulating case having a case bottom on the housing side, the case bottom having a first through hole through which the lead-out portion passes; and a connection terminal having a first connection portion connected to the lead portion in the insulating case and a second connection portion connected to the lead wire led out to the outside of the motor in the insulating case, the connection terminal being disposed along the bottom of the case, the first connection portion crossing over from one edge of the opening to the other edge of the opening opened on the bottom side of the case with respect to the first through hole.

Description

Motor and electric actuator

Technical Field

The invention relates to a motor and an electric actuator.

Background

Conventionally, a structure is known in which a housing made of resin or the like is provided on one end side of a rotating shaft of a motor. The case is used as a housing space for a sensor board, a control board, and the like, and an arrangement space for an electrical connection path from a coil of the motor to the lead wire.

For example, patent document 1 shows the following configuration: the load-side terminal block is provided with a hole through which the first conductive pin or the second conductive pin passes, the load-side terminal is housed in a recess provided in the load-side terminal block, and the load-side terminal is connected to an external power source via a power supply lead. The first conductive pin and the second conductive pin penetrate through the bottom of the opposite-load side terminal block and protrude toward the opposite-load side in the axial direction. In the opposite-load side terminal block, the first conductive pin, the second conductive pin, the power supply lead, and the drive circuit of the circuit board are electrically connected by the opposite-load side terminal. The first conductive pin is formed by winding an end portion of the coil a plurality of times, and is electrically connected to the end portion of the coil by welding.

Patent document 1: international publication No. 2019/167233

In order to reduce the number of assembly steps of the motor, it is required to simplify the electrical connection structure from the coil to the lead wire of the motor. Therefore, a structure in which the coil of the motor and the lead-side terminal are directly connected by welding or the like is considered.

In the case of a structure in which the coil of the motor is directly connected to the lead-wire-side terminal, a hole having a size of an allowance is required at a portion where the coil is introduced into the case from the viewpoint of assemblability. However, workability of connection between the coil and the terminal at the upper portion of the hole is poor.

Disclosure of Invention

Therefore, an object of the present invention is to improve workability in connection work of a coil and a terminal.

One embodiment of the present invention is a motor including a rotor rotatable by a rotation shaft; a stator including a core disposed to face the rotor, and a coil formed by winding a wire around a part of the core, a lead-out portion of the coil being a part of the wire being led out from the core to one side in an axial direction in which the core extends toward the rotation shaft; a housing that houses the rotor and the stator therein; an insulating case disposed on the one side with respect to the housing, the insulating case having a case bottom on the one side of the housing, the case bottom having a first through hole through which the lead-out portion passes; and a connection terminal having a first connection portion connected to the lead portion in the insulating case and a second connection portion connected to a lead wire led out of the motor in the insulating case, the connection terminal being disposed along the case bottom, the first connection portion crossing over an opening opened in the case bottom side with respect to the first through hole from one edge of the opening to the other edge.

In addition, one embodiment of the present invention is an electric actuator including the motor and an actuator unit driven by the motor.

According to the present invention, workability in the connection work of the coil and the terminal is improved.

Drawings

Fig. 1 is a diagram conceptually showing the configuration of an oil pump.

Fig. 2 is a diagram showing the configuration of the stator.

Fig. 3 is a diagram showing the inside of the sensor unit.

Fig. 4 is a diagram showing the configuration of the metal terminal.

Fig. 5 is a diagram showing a positional relationship of the metal terminals and the bottom opening of the housing.

Fig. 6 is a diagram showing a first process in the connection work of the wire connection portion and the end portion of the wire.

Fig. 7 is a diagram showing a second procedure in the connection work of the wire connection portion and the end portion of the wire.

Fig. 8 is a diagram showing a third procedure in the connection work of the wire connecting portion and the end portion of the wire.

Fig. 9 is a diagram showing a first modification example in which the shapes of the metal terminals are different.

Fig. 10 shows a second modification example in which the metal terminals have different shapes.

Fig. 11 is a diagram showing third to eighth modifications in which the positional relationship between the metal terminals and the bottom opening of the housing is different.

Fig. 12 is a diagram showing a ninth modification example in which the structure of the rotation stop projection is different.

Description of the reference symbols

100: an oil pump; 110: a motor section; 111: a motor housing; 111a: a cylindrical portion; 111b: a bottom; 112: a rotating shaft; 113: a rotor; 114: a stator; 120: a sensor section; 121: a substrate housing; 121a: the bottom of the shell; 121b: a through hole; 121c: a positioning protrusion; 121d: a rotation stopping protrusion; 121e: an extension plane; 121f: a shell bottom opening; 122: a sensor substrate; 123. 123_1, … …, 123_8: a metal terminal; 123a: a wire connecting portion; 123b: a lead wire connection portion; 123c: a wire through hole; 123d: a through hole for fixation; 124: a lead; 130: a pump section; 131: a pump housing; 132: a working part; 141: an iron core; 142: a coil; 143: the end of the wire.

Detailed Description

Hereinafter, embodiments of the motor and the electric actuator according to the present invention will be described in detail with reference to the drawings. However, to avoid unnecessarily long descriptions below, those skilled in the art will readily appreciate that detailed descriptions beyond those required may be omitted. For example, detailed descriptions of already known matters and repetitive descriptions of substantially the same configuration may be omitted. In addition, elements described in the above-described drawings may be appropriately referred to in the following description of the drawings.

Fig. 1 is a diagram conceptually showing the configuration of an oil pump.

The oil pump 100 corresponds to one embodiment of the electric actuator of the present invention.

The oil pump 100 includes a motor portion 110, a sensor portion 120, and a pump portion 130.

The motor unit 110 receives electric power and generates a rotational driving force.

The sensor unit 120 detects rotation of the motor unit 110.

The pump section 130 is driven by the motor section 110 to suck and discharge oil.

The combination of the motor unit 110 and the sensor unit 120 corresponds to an embodiment of the motor of the present invention, and the pump unit 130 corresponds to an example of the actuator unit of the present invention.

The motor unit 110 includes a motor housing 111, a rotating shaft 112, a rotor 113, and a stator 114.

The rotary shaft 112 is a member that transmits the rotational driving force of the motor unit 110. In the following description, the rotation axis 112 is sometimes used as a reference of the direction, and the direction along the rotation axis 112 is sometimes referred to as an axial direction. In the following description, regardless of the direction shown in the drawing, the upper side in fig. 1 is sometimes referred to as the one axial side, and the lower side in fig. 1 is sometimes referred to as the other axial side. In the following description, a direction approaching and separating from the rotation center line of the rotation shaft 112 is sometimes referred to as a radial direction, a direction approaching the rotation shaft 112 is sometimes referred to as a radial inner side, and a direction separating from the rotation shaft 112 is sometimes referred to as a radial outer side. In the following description, the direction around the rotation axis 112 is sometimes referred to as the circumferential direction.

The motor housing 111 is a structure supporting the entire motor unit 110 and the oil pump 100, and is formed by, for example, press working of a sheet metal. The motor housing 111 corresponds to an example of a housing according to the present invention, and houses the rotor 113 and the stator 114 therein. For example, the motor housing 111 has a cylindrical portion 111a extending in the axial direction and a bottom portion 111b located on one axial side of the cylindrical portion 111 a. The sectional shape of the cylindrical portion 111a of the motor housing 111 is not particularly limited. The cross-sectional shape of the tube 111a may be, for example, a circle or an oval circle, a square or a rectangular square, or another polygon such as a triangle or a pentagon.

The rotor 113 is fixed to the rotating shaft 112, and includes, for example, a permanent magnet, and rotates together with the rotating shaft 112 by the action of the rotating magnetic field. In other words, the rotor 113 can be rotated by the rotation shaft 112.

The stator 114 is disposed in the motor case 111 so as to face the rotor 113, and generates a rotating magnetic field. In the present embodiment, an inner rotor type structure in which the stator 114 is disposed radially outward of the rotor 113 is shown, but the motor of the present invention may have an outer rotor type structure in which the stator 114 is disposed radially inward of the rotor 113.

The sensor unit 120 includes a substrate case 121 and a sensor substrate 122.

The board case 121 corresponds to an example of an insulating case according to the present invention, and is disposed on one axial side of the motor case 111. The board case 121 is made of, for example, resin, and has a case bottom portion 121a on the motor case 111 side. The case bottom 121a is provided with a through hole 121b extending from the motor case 111 side to the inside of the board case 121.

The end of the lead wire drawn out from the coil of the stator 114 is guided to the board case 121, and in the present embodiment, the board case 121 is used as a drawing space for wiring of the motor 110. The substrate case 121 accommodates and holds the sensor substrate 122 therein.

For example, the sensor substrate 122 includes a magnetic sensor, and detects, for example, the rotational position and the rotational speed of the rotary shaft 112. The substrate case 121 may house the control substrate and the inverter substrate together with the sensor substrate 122 or in place of the sensor substrate 122. The insulating case according to the present invention may be a case in which the substrate is not housed.

The pump section 130 has a pump housing 131 and an operating section 132. The motor case 111 has a bottom portion 111b on one axial side, and the pump portion 130 is disposed on the other axial side of the motor case 111.

The pump housing 131 houses the working unit 132 and is fixed to the motor housing 111. The pump housing 131 rotatably supports the rotary shaft 112. In the present embodiment, the pump housing 131 supports the rotary shaft 112 by, for example, a slide bearing (not shown), but the pump housing 131 may support the rotary shaft 112 by a ball bearing or a rolling bearing. In the present embodiment, a so-called single-side support structure in which the rotary shaft 112 is supported by one end on the pump section 130 side is used as an example, but the rotary shaft 112 may be supported by both ends on the pump section 130 side and the sensor section 120 side.

The working portion 132 rotates within the pump housing 131 by the driving force of the rotary shaft 112, and thereby performs suction and discharge of oil.

Fig. 2 is a diagram showing the configuration of the stator.

The stator 114 has: a core 141 disposed so as to face the rotor 113; and a coil 142 formed by winding a conductive wire around a part of the core 141, wherein an end 143 of the coil 142, which is a part of the conductive wire, is drawn out from the core 141 to one axial side.

Since the end 143 of the coil 142 from which the lead wire is drawn is flexible, it is difficult to stand by itself against gravity, or even standing by itself is unstable. In the present embodiment, since a three-phase motor is used as an example, the coil 142 has 3 sets of end portions 143 of the lead wires in total corresponding to each UVW. The end 143 of the lead wire corresponds to an example of the lead-out portion of the present invention. The lead-out portion according to the present invention does not need to be an end portion of the lead wire, and may be a lead-out portion in which a middle portion of the lead wire is led out from the core 141.

When the motor unit 110 is assembled, the stator 114 is inserted into the motor housing 111, for example, from the other axial side. When the stator 114 is inserted, the end 143 of the lead wire is positioned in front of the insertion, and the end 143 of the lead wire faces the bottom 111b of the motor case 111 as the stator 114 is inserted. The end 143 of the lead is guided from the motor 110 to the sensor 120 via the through hole 121b of the case bottom 121a.

Fig. 3 is a diagram illustrating the inside of the sensor unit 120.

Fig. 3 shows a state in which one axial side of the substrate case 121 is open, the sensor unit 120 includes a sensor substrate 122 housed in the substrate case 121, and a metal terminal 123 arranged along a case bottom portion 121a of the substrate case 121, and the substrate case 121 includes a through hole 121b in the case bottom portion 121a through which an end portion 143 of a lead wire is inserted. The through-hole 121b of the board case 121 corresponds to an example of the first through-hole of the present invention. Hereinafter, the opening of the through hole 121b to the case bottom 121a side is referred to as a case bottom opening 121f.

The end portions 143 of the lead wires may be inserted through the through holes 121b, but in the present embodiment, the coil 142 has a plurality of (e.g., 6) lead wire end portions 143, and the plurality of (e.g., 2) lead wire end portions 143 are inserted through 1 through hole 121b of the substrate case 121. That is, in the board case 121, a plurality of (for example, 2) lead ends 143 protrude inward from 1 case bottom opening 121f. With the structure in which the end portions 143 of the plurality of lead wires are inserted through 1 through-hole 121b, the work of inserting the end portions 143 of the lead wires through the through-holes 121b can be reduced as compared with the structure in which the end portions 143 are inserted through the through-holes 121b.

A lead wire 124 led out to the outside of the oil pump 100 is also disposed in the substrate case 121.

The metal terminals 123 and the through holes 121b are provided with 3 sets corresponding to the UVW of the motor, respectively. The metal terminal 123 corresponds to an example of a connection terminal according to the present invention, and electrically connects the end 143 of the lead wire and the lead 124 to each other.

Fig. 4 is a diagram illustrating the configuration of the metal terminal 123.

The metal terminal 123 has a wire connection portion 123a connected to an end 143 of the wire and a lead connection portion 123b connected to the lead 124. The wire connection portion 123a corresponds to an example of the first connection portion of the present invention, and the lead connection portion 123b corresponds to an example of the second connection portion of the present invention. In the present embodiment, the metal terminal 123 has the wire connection portion 123a and the lead connection portion 123b at each end, but the connection terminal according to the present invention may have the first connection portion and the second connection portion at portions other than the end portions.

In the metal terminal 123 of the present embodiment, the lead wire connection portion 123a is connected to the end portion 143 of the lead wire by welding, and the lead wire connection portion 123b is connected to the lead wire 124 by crimping. The wire connecting portion 123a has a plurality of wire through holes 123c through which the end portions 143 of a plurality of (e.g., 2) wires are inserted. The lead through-hole 123c corresponds to an example of the second through-hole according to the present invention. The lead wire connecting portion 123a may have 1 slit or the like through which the plurality of end portions 143 of the lead wire are collectively inserted, instead of the plurality of lead wire through holes 123c. The lead wire through hole 123c may be provided in the center of the lead wire connection portion 123a, or may be provided to be offset in one direction.

The lead connecting portion 123b has a shape extending in the longitudinal direction from the lead connecting portion 123b toward the lead connecting portion 123a, and the lead connecting portion 123b has a fixing through hole 123d at a middle portion extending in the longitudinal direction.

In the present embodiment, the metal terminal 123 intersecting the longitudinal direction of the wire connecting portion 123a has a larger dimension in the width direction W than the wire connecting portion 123b. The dimension of the wire connection portion 123a in the width direction W may be equal to or less than the lead connection portion 123b.

Fig. 5 is a diagram showing a positional relationship between the metal terminal 123 and the housing bottom opening 121f.

The metal terminal 123 is disposed in the substrate case 121 along the case bottom 121a, and the wire connection portion 123a of the metal terminal 123 crosses over the case bottom opening 121f from one edge to the other edge of the case bottom opening 121f with respect to the case bottom opening 121f. In the example shown in fig. 5, the wire connecting portion 123a crosses the housing bottom opening 121f in the width direction W, but the direction crossed by the first connecting portion in the present invention may be any direction.

Since the wire connecting portion 123a connected to the end portion 143 of the wire extends across the case bottom opening 121f, even if a soldering iron or the like comes into contact with the wire connecting portion 123a during a connecting operation such as soldering, the bending of the wire connecting portion 123a, the inclination of the metal terminal 123, and the like are suppressed, and workability is improved. Further, since the lead 124 and the end 143 of the lead are connected via the metal terminal 123, the number of components can be reduced.

In the present embodiment, the wire connecting portion 123a crosses the case bottom opening 121f in the width direction W of the connection terminal 123. That is, the wire connecting portion 123a has a shape expanding in the width direction W, and the size of the wire connecting portion 123a is larger than the size of the case bottom opening 121f in the width direction W. Both ends of the wire connecting portion 123a in the width direction W are positioned on both sides across the case bottom opening 121f. By this configuration and this arrangement of the wire connecting portion 123a, the stability of the metal terminal 123 in the width direction W in particular is improved.

In the present embodiment, since the dimension in the width direction W of the wire connecting portion 123a is larger than the dimension in the width direction W of the wire connecting portion 123b, the stability of the metal terminal 123 is further increased, and the space for a contact iron or the like during the connection work is increased, thereby improving the workability. In the example of the metal terminal 123 shown in fig. 5, the wire connecting portion 123a has a so-called T-shape that protrudes to both sides in the width direction W (i.e., to both the top and bottom in fig. 5) with respect to the lead connecting portion 123b, but the metal terminal 123 may have a so-called L-shape that protrudes to one side in the width direction W with respect to the lead connecting portion 123b.

The case bottom opening 121f (and the cross section of the through hole 121b of the substrate case 121) may be circular, but in the present embodiment, the case bottom opening 121f has a major diameter direction and a minor diameter direction, and the major diameter direction is oriented in the revolving direction R around the rotation shaft 112. The specific shape of the case bottom opening 121f may be an ellipse or an oblong. Since assembly errors of the coil and the core with respect to the board case 121 are likely to occur in the circumferential direction R, a margin for the assembly errors of the coil and the core can be obtained by orienting the longitudinal direction of the case bottom opening 121f in the circumferential direction R.

The metal terminal 123 is formed by crimping the lead wire connection portion 123b to the lead wire 124 in advance outside the board case 121, and welding the lead wire connection portion 123a and the end 143 of the lead wire together inside the board case 121.

The following describes the operation procedure in the connection operation between the wire connecting portion 123a and the end portion 143 of the wire.

Fig. 6 to 8 are diagrams illustrating a connection operation procedure of the wire connecting portion 123a and the end portion 143 of the wire. Fig. 6 shows a first procedure in the connection job, fig. 7 shows a second procedure in the connection job, and fig. 8 shows a third procedure in the connection job. In fig. 7 and 8, the lead wire 124 is omitted for convenience of illustration, but the lead wire 124 is actually connected to the lead wire connection portion 123b.

In the first process of the connection operation, the end 143 of the lead is inserted into the board case 121 through the through hole 121b. The substrate case 121 has a positioning protrusion 121c and a rotation stop protrusion 121d on a case bottom 121a.

In the second process of the connecting work, the metal terminals 123 are arranged corresponding to the positions of the positioning protrusions 121c and the rotation stop protrusions 121d. That is, the end 143 of the lead wire is inserted into the lead wire through hole 123c of the lead wire connection portion 123a, the positioning protrusion 121c is inserted into the fixing through hole 123d, and the lead wire connection portion 123b is inserted between the 2 rotation stopping protrusions 121d. As described above, the end portions 143 of the lead wire pass through the lead wire through holes 123c of the lead wire connection portion 123 a.

The positioning projection 121c projects toward the metal terminal 123, and the positioning projection 121c is inserted into a fixing through hole 123d of the metal terminal 123. The positioning protrusion 121c corresponds to an example of the first protrusion according to the present invention. In addition, although a recess having a bottom in the insertion direction may be disposed as the insertion portion of the present invention into which the positioning protrusion 121c is inserted, in the present embodiment, a fixing through hole 123d through which the positioning protrusion 121c is inserted is used. That is, the fixing through-hole 123d corresponds to an example of the insertion portion according to the present invention, and also corresponds to an example of the third through-hole according to the present invention. The metal terminal 123 is positioned with respect to the case bottom 121a by the positioning protrusion 121c.

The rotation stop protrusion 121d protrudes along the metal terminal 123. The detent projection 121d corresponds to an example of the second protrusion according to the present invention. In the example shown in fig. 6 to 8, the extending surface 121e of the rotation stop protrusion 121d extending along the metal terminal 123 does not face the positioning protrusion 121c. That is, since the rotation stop protrusion 121d is located at a position away from the positioning protrusion 121c which is the rotation center of the metal terminal 123, the accuracy of rotation stop is higher than that in the case where the extended surface 121e faces the positioning protrusion 121c. In the example shown in fig. 6 to 8, since the rotation stopping protrusions 121d are disposed on both sides across the metal terminal 123, the rotation stopping accuracy of the metal terminal 123 is higher than that in the case where the rotation stopping protrusions 121d are disposed on one side.

The wire connecting portion 123a is stably positioned on the case bottom opening 121f by the metal terminal 123 being stopped by the rotation stopping protrusion 121d.

In the third process of the connection work, the end 143 of the wire is connected to the wire connecting portion 123a by the solder 150. That is, end 143 of the lead is electrically connected to and physically fixed to lead connection portion 123 a. The end portions 143 of the lead wires are inserted into the lead wire through holes 123c of the lead wire connection portions 123a, respectively, so that the position and shape of the solder 150 are stabilized during soldering. As a result, the durability of the connection is improved, and variation in electrical characteristics is suppressed.

In the example shown in fig. 6 to 8, since the positioning projection 121c penetrates the fixing through hole 123d, after connection by welding, the portion of the positioning projection 121c protruding from the fixing through hole 123d is deformed by thermocompression bonding, and the metal terminal 123 is fixed to the case bottom portion 121a. Further, the thermal compression bonding of the portion of the positioning protrusion 121c protruding from the fixing through hole 123d has no problem even before the wire connecting portion 123a and the end 143 of the wire are connected by soldering. When the portion of the positioning protrusion 121c protruding from the fixing through hole 123d is thermocompression bonded before the wire connecting portion 123a is welded to the end portion 143 of the wire, the metal terminal 123 is prevented from floating from the case bottom portion 121a, and the wire connecting portion 123a and the end portion 143 of the wire are easily welded.

Various modifications to the above embodiment will be described below.

Fig. 9 is a diagram showing a first modification example in which the shapes of the metal terminals are different.

In the metal terminal 123 v 1 of the modification shown in fig. 9, the wire connecting portion 123a and the lead connecting portion 123b have the same dimension in the width direction W. Since there is no step difference between the wire connection portion 123a and the lead connection portion 123b, the metal terminal 123_1 can be easily manufactured and the yield is high.

In the modification shown in fig. 9, the wire connection portion 123a extends across the housing bottom opening 121f in the longitudinal direction L of the metal terminal 123_1. That is, the wire connection portion 123a has a shape extending in the longitudinal direction L, and the size of the wire connection portion 123a is larger than the size of the case bottom opening 121f in the longitudinal direction L. Both ends of the wire connecting portion 123a in the longitudinal direction L are positioned on both sides across the case bottom opening 121f.

By the configuration and arrangement of the wire connecting portion 123a shown in fig. 9, the stability of the metal terminal 123 u 1 is improved particularly in the longitudinal direction L.

Fig. 10 is a diagram showing a second modification in which the shapes of the metal terminals are different.

In the metal terminal 123 v 2 of the modification shown in fig. 10, the size of the wire connecting portion 123a is larger than that of the example shown in fig. 5, and the wire connecting portion 123a extends across the case bottom opening 121f in both the longitudinal direction L and the width direction W. That is, the wire connecting portion 123a has a shape that expands in both the longitudinal direction L and the width direction W, and the dimension of the wire connecting portion 123a is larger than the dimension of the case bottom opening 121f in both the longitudinal direction L and the width direction W. Both ends in the longitudinal direction L of the wire connecting portion 123a are positioned on both sides across the case bottom opening 121f, and both ends in the width direction W of the wire connecting portion 123a are positioned on both sides across the case bottom opening 121f. As a result, in the modification shown in fig. 10, the stability of metal terminal 123 wu 2 in both the longitudinal direction L and the width direction W is improved.

Fig. 11 is a diagram showing third to eighth modifications that differ in the arrangement relationship between the metal terminals and the housing bottom opening 121f. In any of the modifications shown in fig. 11, the case bottom opening 121f has a major diameter direction LD and a minor diameter direction SD.

The wire connection portion 123a of the metal terminal 123_3 of the third modification is wider than the lead connection portion 123b in the width direction. In the third modification, the wire connection portion 123a extends across the case bottom opening 121f in the short diameter direction SD. That is, the wire connecting portion 123a is larger in size in the short diameter direction SD than the short diameter of the case bottom opening 121f, and both ends of the wire connecting portion 123a in the short diameter direction SD are positioned on both sides across the case bottom opening 121f.

In the third modification, the stability of the metal terminal 123_3 in the short diameter direction SD is improved, and the metal terminal 123_3 can be reduced in size. In the third modification, the short diameter direction SD of the case bottom opening 121f is directed in the width direction of the metal terminal 123_3, and therefore the wire connecting portion 123a extends across the case bottom opening 121f in the width direction with reference to the direction of the metal terminal 123_3.

The wire connection portion 123a and the lead connection portion 123b of the metal terminal 123_4 according to the fourth modification have the same width dimension. In the fourth modification as well, the lead wire connecting portion 123a extends across the case bottom opening 121f in the short diameter direction SD as in the third modification, and the stability of the metal terminal 123 xu 4 in the short diameter direction SD is improved. However, in the fourth modification, since the short diameter direction SD of the case bottom opening 121f is directed in the longitudinal direction of the metal terminal 123_4, the lead wire connecting portion 123a crosses the case bottom opening 121f in the longitudinal direction of the metal terminal 123_4 with reference to the direction of the metal terminal 123_4.

The wire connection portion 123a of the metal terminal 123_5 of the fifth modification is wider than the lead connection portion 123b in the width direction. In the fifth modification, the wire connection portion 123a extends across the case bottom opening 121f in the longitudinal direction LD. That is, the dimension of the wire connecting portion 123a in the longitudinal direction LD is larger than the short diameter of the case bottom opening 121f, and both ends of the wire connecting portion 123a in the longitudinal direction LD are positioned on both sides across the case bottom opening 121f.

In the fifth modification, the stability of the metal terminal 123 wu 5 in the long diameter direction LD is improved. In the fifth modification, the longitudinal direction LD of the case bottom opening 121f is oriented in the width direction of the metal terminal 123_5, and therefore the wire connecting portion 123a extends across the case bottom opening 121f in the width direction with reference to the orientation of the metal terminal 123_5.

The wire connection portion 123a and the lead connection portion 123b of the metal terminal 123_6 according to the sixth modification have the same width dimension. In the sixth modification as well, the lead connecting portion 123a extends across the housing bottom opening 121f in the longitudinal direction LD in the same manner as in the fifth modification, and the stability of the metal terminal 123 xu 6 in the longitudinal direction LD is improved. However, in the sixth modification, the longitudinal direction LD of the case bottom opening 121f is oriented in the longitudinal direction of the metal terminal 123_6, and therefore the wire connecting portion 123a crosses the case bottom opening 121f in the longitudinal direction of the metal terminal 123_6 with reference to the orientation of the metal terminal 123_6.

The wire connection portion 123a of the metal terminal 123_7 of the seventh modification is wider than the lead connection portion 123b in the width direction. In the seventh modification, the wire connecting portion 123a extends across the case bottom opening 121f in both the long diameter direction LD and the short diameter direction SD. That is, the wire connecting portion 123a has a shape expanding in both the major diameter direction LD and the minor diameter direction SD, and the dimension of the wire connecting portion 123a is larger than the dimension of the case bottom opening 121f in both the major diameter direction LD and the minor diameter direction SD. Further, both ends of the wire connecting portion 123a in the long diameter direction LD are positioned on both sides across the case bottom opening 121f, and both ends of the wire connecting portion 123a in the short diameter direction SD are positioned on both sides across the case bottom opening 121f.

In the seventh modification, the stability of the metal terminal 123 u 7 in both the long diameter direction LD and the short diameter direction SD is improved. In the seventh modification, the longitudinal direction LD of the case bottom opening 121f is oriented in the width direction of the metal terminal 123 u 7.

The wire connecting portion 123a and the lead connecting portion 123b of the metal terminal 123_8 according to the eighth modification have the same width dimension. In the eighth modification as well, the wire connecting portion 123a extends across the case bottom opening 121f in both the major diameter direction LD and the minor diameter direction SD, as in the seventh modification. However, in the eighth modification, the longitudinal direction LD of the case bottom opening 121f is oriented in the longitudinal direction of the metal terminal 123.

Fig. 12 is a diagram illustrating a ninth modification example in which the rotation stop protrusion 121d has a different structure.

In the ninth modification, the rotation stop protrusion 121d is provided only on one side of the metal terminal 123. Further, the extending surface 121e of the rotation stop protrusion 121d extending along the metal terminal 123 faces the positioning protrusion 121c. Since the extending surface 121e faces the positioning projection 121c, even with only one rotation stop projection 121d, rotation of the metal terminal 123 in both the right and left directions can be stopped. Therefore, compared to a structure in which the detent projections 121d are disposed on both sides of the metal terminal 123, the disposition space of the detent projections 121d can be suppressed.

In the above description, the oil pump is described as an example of a method of using the motor and the electric actuator of the present invention, but the method of using the motor and the electric actuator of the present invention is not limited to the above. The motor and the electric actuator of the present invention can be used in a wide range of power steering apparatuses, compressors, and the like.

The above-described embodiments should be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the claims, not the above embodiments, and is intended to include meanings equivalent to the claims and all modifications within the scope.

Claims (17)

1. A motor, comprising:

a rotor that can be rotated by a rotating shaft;

a stator including a core disposed to face the rotor and a coil formed by winding a wire around a part of the core, wherein a lead portion of the coil, which is a part of the wire, is led out from the core to one side in an axial direction in which the rotary shaft extends;

a housing that houses the rotor and the stator therein;

an insulating case disposed on the one side with respect to the housing, having a case bottom portion on the one side of the housing, and having a first through hole in the case bottom portion through which the lead-out portion passes; and

and a connection terminal having a first connection portion connected to the lead portion and a second connection portion connected to a lead led out of the motor, the connection terminal being disposed in the insulating housing along the housing bottom portion, the first connection portion crossing over an opening opened in the housing bottom portion side with respect to the first through hole from one edge of the opening to the other edge.

2. The motor of claim 1,

the first connection portion crosses the opening in a longitudinal direction of the connection terminal from the second connection portion toward the first connection portion.

3. The motor of claim 1,

the first connection portion crosses the opening in a width direction of the connection terminal intersecting a length direction from the second connection portion toward the first connection portion.

4. The motor of claim 1,

the first connection portion crosses the opening in both a longitudinal direction of the connection terminal from the second connection portion toward the first connection portion and a width direction of the connection terminal intersecting the longitudinal direction.

5. The motor according to any one of claims 1 to 4,

the opening has a major diameter direction and a minor diameter direction,

the first connecting portion crosses the opening in the long-diameter direction.

6. The motor according to any one of claims 1 to 4,

the opening has a major diameter direction and a minor diameter direction,

the first connecting portion crosses the opening in the short diameter direction.

7. The motor according to any one of claims 1 to 4,

the opening has a major diameter direction and a minor diameter direction,

the first connecting portion extends across the opening in both the major diameter direction and the minor diameter direction.

8. The motor according to any one of claims 1 to 4,

the opening has a major diameter direction and a minor diameter direction, and the major diameter direction faces a circling direction that encircles the rotation axis.

9. The motor according to any one of claims 1 to 4,

the second connection portion has a shape extending in a length direction from the second connection portion toward the first connection portion,

a dimension of the first connection portion in a width direction of the connection terminal intersecting the length direction is larger than a dimension of the second connection portion in the width direction of the connection terminal intersecting the length direction.

10. The motor according to any one of claims 1 to 4,

the coil has a plurality of the lead-out portions which pass through the first through hole,

the first connecting portion has a plurality of second through holes through which the plurality of lead-out portions pass, respectively.

11. The motor according to any one of claims 1 to 4,

the insulating housing has a first protruding portion protruding toward the connection terminal at the housing bottom,

the connection terminal has an insertion portion into which the first protrusion is inserted.

12. The motor of claim 11,

the insertion portion is a third through hole through which the first protruding portion passes.

13. The motor of claim 11,

the insulating case has a second protrusion protruding along the connection terminal at the case bottom.

14. The motor of claim 13,

an extension surface of the second protruding portion extending along the connection terminal is opposed to the first protruding portion.

15. The motor of claim 13,

an extension surface of the second protruding portion extending along the connection terminal does not face the first protruding portion.

16. The motor of claim 13,

the second protruding portions are disposed on both sides across the connection terminal.

17. An electric actuator having:

the motor of any one of claims 1 to 16; and

an actuator section driven by the motor.

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