JP2023041388A - Electric apparatus and motor - Google Patents

Abstract

To provide a motor which suppresses deterioration of a first O-ring due to adhesion of a liquid gasket and which can improve airtightness of a sensor casing and a cover part joined to each other, at low cost.SOLUTION: A casing 113b houses a rotation detection sensor, a communication port of a first liquid path 113f of the sensor casing 113b and a first O-ring 131 surrounding the communication port are arranged outside a frame of a frame-shape seal material 129 disposed on a joint face 113c in a face direction of the joint face 113c having the communication port, and at least one of the sensor casing 113b and a cover includes, on the joint face 113c, a gasket acquisition groove 113e arranged between the seal material 129 and the first O-ring 131 in the face direction of the joint face 113c.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to an electric device such as a motor, and a motor.

Conventionally, a casing and a cover covering an opening of the casing are provided, and each of the casing and the cover has a joint surface that is joined to each other, a liquid path that is a flow path of the refrigerant, and a seal material and a seal interposed between the respective joint surfaces. Electrical devices with O-rings are known.

For example, a motor as an electric device described in Patent Document 1 includes a motor casing and a motor cover that covers an opening of the motor casing. Each of the motor casing and the motor cover includes joint surfaces (end surfaces, butt surfaces) that are joined to each other, cooling oil passages that serve as coolant flow paths, and liquid gaskets that serve as sealing materials interposed between the respective joint surfaces. , and O-rings are opened as communication ports at the joint surfaces and communicate with each other. The O-ring is interposed between the motor casing and the motor cover and arranged in a manner surrounding the communication openings of the two cooling oil passages communicating with each other.

Japanese Unexamined Patent Application Publication No. 2016-49000

On the other hand, as an electrical device developed by the present inventors, there is an electrical device that includes a sensor casing that houses a sensor and a sensor cover that covers an opening of the sensor casing. This electrical device includes an O-ring made of an elastic material and a sealing material made of a liquid gasket. The O-ring is interposed between the sensor casing and the sensor cover at the communicating portion between the fluid path of the sensor casing and the fluid path of the sensor cover, and surrounds the communication opening of each fluid path. Further, the sealing material is interposed between the joint surface of the sensor casing and the joint surface of the sensor cover to seal the inside of the sensor casing. According to such a configuration, the O-rings surrounding the communicating openings of the fluid passages of the sensor casing and the sensor cover seal the small gaps between the respective joint surfaces, thereby preventing leakage from the gaps. refrigerant leakage can be suppressed. In addition, the sealing member interposed between the joint surface of the sensor casing and the joint surface of the motor cover can improve the airtightness inside the sensor casing. Furthermore, when this electric device is applied to an oil-cooled motor equipped with a rotation detection sensor for detecting rotation of the rotor, the following effects can be obtained. That is, by increasing the airtightness in the sensor casing, the cooling oil flowing into the sensor casing is prevented from leaking to the outside of the sensor casing. This is an effect that it is possible to suppress the deterioration that occurs.

However, in this electrical device, when the sensor casing and the sensor cover are joined together, there is a risk that the sealing material made of the liquid gasket will spread along the joining surface and adhere to the O-ring, and the adherence will speed up the deterioration of the O-ring. There is a risk of If a solid gasket such as a metal gasket is used instead of a liquid gasket, it is possible to avoid deterioration of the O-ring due to adhesion of the liquid gasket. Cost reduction cannot be achieved.

The present invention has been made in view of the above background, and an object thereof is to provide the following electrical equipment and motor. That is, it is an electric device and a motor that can suppress the deterioration of the O-ring due to the adhesion of the liquid gasket and can increase the airtightness of the sensor casing and the sensor cover that are joined to each other at low cost.

One aspect of the present invention includes a casing and a cover that covers an opening of the casing, and the casing and the cover each include joint surfaces that are joined to each other, liquid passages that serve as coolant flow paths, and the joint surfaces of the respective joint surfaces. A sealing material and an O-ring interposed therebetween are provided, and the respective liquid passages open as communication ports at the joint surfaces and communicate with each other, and the O-ring is interposed between the casing and the cover. The electrical device is arranged in a manner surrounding the communication port of each of the two liquid paths communicating with each other, wherein the casing is a sensor casing that houses a sensor, and the communication port and the O-ring are arranged outside the frame of the frame-shaped sealing material in the plane direction of the joint surface, and at least one of the sensor casing and the cover is arranged in the plane direction of the joint surface, and at least one of the sealing material and the It is characterized in that the joint surface is provided with a groove arranged between the O-ring.

According to the present invention, the deterioration of an O-ring due to adhesion of a liquid gasket is suppressed, and the airtightness of a sensor casing (hereinafter also referred to as a casing) and a sensor cover (hereinafter also referred to as a cover) that are joined to each other is improved at low cost. There is an excellent effect of being able to In addition, according to the present invention, the following effects can also be produced. That is, the fluid passages of the casing and the cover and the O-rings surrounding the communication openings of the fluid passages are arranged outside the frame of the sealing material, so that the refrigerant in the fluid passages flows between the O-rings and the casing or the cover. Even if the coolant leaks through the gap, it is possible to prevent the coolant from entering the casing.

It is a perspective view showing an example of a motor concerning an embodiment. It is a figure which shows typically the internal structure of the same motor. FIG. 3 is an exploded perspective view showing the second housing of the motor 1 from the rear side in the axial direction; It is a top view which shows the same 2nd housing b from the rear side of an axial direction. FIG. 4 is an exploded perspective view showing the second housing, the cover/casing unit, and the switching unit from the rear side in the axial direction; It is a perspective view which shows the same switching unit. It is sectional drawing which shows the same 2nd housing.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In order to facilitate the understanding of the description in the embodiments, structures and elements other than the main part of the present invention will be described with simplification or omission. Moreover, in the drawings, the same reference numerals are given to the same elements. It should be noted that the shape, dimensions, etc. of each element shown in the drawings are schematically shown, and do not represent the actual shape, dimensions, etc.

FIG. 1 is a perspective view showing an example of a motor 1 according to an embodiment. FIG. 2 is a diagram schematically showing the internal structure of the motor 1 of FIG. Hereinafter, the direction along the rotation axis of the motor unit 102 and the direction parallel thereto are referred to as the axial direction (Ax). In the axial direction, the speed reducer 104 side is called the front side, and the inverter section 103 side is called the rear side.

As shown in FIG. 2, the motor 1 includes a motor section 102, an inverter section 103, a speed reducer 104, a housing 105, and a drive shaft . Motor section 102 , inverter section 103 , and speed reducer 104 are all housed inside housing 105 .

The motor unit 102 includes a stator 107 wound with coils (not shown), a rotor 108 having permanent magnets (not shown), and a motor shaft 109 inserted into the iron core of the rotor 108 along the rotation axis. Prepare. The motor 1 is an inner rotor type motor, and the stator 107 is arranged on the outer circumference of the rotor 108 with a slight air gap. In the motor unit 102 , the magnetic field of the stator 107 is switched in order by current control of the coil, so that the rotor 108 rotates around the motor shaft 109 due to the attraction or repulsion force with the magnetic field of the rotor 108 . The motor shaft 109 is rotatably supported by bearings 110a and 110b arranged on the load side and the anti-load side, respectively.

The inverter section 103 is a controller for controlling the driving of the motor section 2 and is arranged on the opposite side of the motor shaft 109 to the load. The inverter unit 103 includes elements such as, for example, high-speed switching elements (IGBTs, etc.), gate substrates, capacitors, discharge resistors, and control substrates. The inverter unit 103 converts the DC voltage from the battery (not shown) into AC during powering and supplies it to the coil of the motor unit 102, and during regeneration, converts the AC from the motor unit 102 into DC to the battery. .

The speed reducer 104 is a power transmission mechanism that is connected to the load side of the motor shaft 109 and transmits the power of the motor section 102 to one side of the drive shaft 106 .

The speed reducer 104 includes, for example, an input shaft 104a (motor shaft), a counter shaft 104b, an output shaft 104c (drive shaft), an input gear 104d, and a first counter gear 104e. The speed reducer 104 also includes a second counter gear 104f, a drive gear 104g and a differential gear 104h. An input gear 104d is provided on the input shaft 104a. A first counter gear 104e and a second counter gear 104f are provided on the counter shaft 104b. A drive gear 104g and a differential gear 104h are provided on the output shaft 104c.

The input shaft 104a, which is the motor shaft 109, is rotated by the power of the motor section 102. As shown in FIG. The input gear 104d of the input shaft 104a meshes with the first counter gear 104e of the countershaft 104b. Also, the second counter gear 104f of the counter shaft 104b meshes with the drive gear 104g of the output shaft 104c. The driving force of the first counter gear 104e is decelerated (accelerated) by the combination of the second counter gear 104f of the counter shaft 104b and the drive gear 104g of the output shaft 104c, and is output from the output shaft 104c, which is the drive shaft 106. .

As shown in FIG. 1, drive shaft 106 is a half shaft extending in a direction parallel to the axial direction of motor section 102 . The drive shaft 106 has one side connected to the reduction gear 104 and the other side attached to a drive wheel (not shown) via a constant velocity joint 111 . The other side of the drive shaft 106 is rotatably supported by a support portion 120 provided in the housing 105 .

The housing 105 has a first housing 112 , a second housing 113 , a third housing 114 and an inverter cover 115 . The first housing 112 functions as a motor housing that accommodates the motor section 102 . The second housing 113 functions as a motor unit/inverter unit housing that accommodates a portion of the motor unit 102 and the inverter unit 103 . The axial front side of the second housing 113 accommodates the axial rear side end of the motor section 102 . Further, the rear side of the second housing 113 in the axial direction accommodates the inverter section 103 . A rear-side end of the second housing 113 is open toward the rear side, and this opening is closed by an inverter cover 115 .

The housing 105 includes a first housing 112, a second housing 113, a third housing 114, and an inverter cover 115, and is attached to the vehicle body (not shown) of the electric vehicle. Each of the first housing 112, the second housing 113, the third housing 114, and the inverter cover 115 is a cast product of conductive metal such as an aluminum alloy, and all of them are conductive. Therefore, the housing 105 is electrically connected to the vehicle body through an attachment portion (not shown) for the vehicle body, and has the same ground potential as the vehicle body. Note that the housing 105 and the vehicle body may be electrically connected by a ground wire, if necessary.

The second housing 113 is connected to the rear side of the first housing 112 (on the right side in FIG. 2 and opposite to the load side of the motor section 102). Also, the third housing 114 is connected to the front side of the first housing 112 (the left side in FIG. 2, which is the load side). Therefore, the second housing 113 and the third housing 114 are arranged with the first housing 112 separated in the axial direction.

A second housing 113 that accommodates the inverter section 103 in the housing 105 is provided with a support section 120 that rotatably supports the other side of the drive shaft 106 outside the housing. The support portion 120 has a function of electrically connecting the drive shaft 106 to the vehicle body through the housing 105 and grounding the drive shaft 106 .

The second housing 113 serves as both a motor housing and an inverter housing. Hereinafter, in the second housing 113, the space that functions as the motor housing (the space on the front side in the axial direction) will be referred to as the motor section space, and the space that will function as the inverter housing (the space on the rear side in the axial direction) will be referred to as the inverter section space. To tell. In the second housing 113, the motor section space and the inverter section space are separated by a partition wall 113a.

FIG. 3 is an exploded perspective view showing the second housing 113 from the axial rear side. The second housing 113 has a sensor casing 113b. The axial rear end of the sensor casing 113b protrudes rearward a little from the axial rear end face of the partition wall 113a. The axial rear end of the sensor casing 113b opens toward the rear side. A peripheral wall of the sensor casing 113b protrudes in an embossed manner toward the inside of the motor section space. A rotation detection sensor 130 such as a resolver is accommodated in the sensor casing 113b. The rotation detection sensor 130 indirectly detects the rotation of the rotor (108 in FIG. 2) that rotates together with the motor shaft (109 in FIG. 2) by detecting the rotation of the motor shaft (109 in FIG. 2).

The inverter section ( 103 in FIG. 2) comprises a cover and casing unit 140 . The cover-cum-casing unit 140 is made of cast metal such as aluminum, and includes a cover portion 141 and a passage casing portion 142 arranged on the rear side of the cover portion 141 in the axial direction. The cover/casing unit 140 is fixed to the rear side of the sensor casing 113b by a plurality of bolts 145. As shown in FIG. By this fixation, the cover portion 141 of the cover/casing unit 140 closes the rear side opening of the sensor casing 113b. In this state, the joint surface 113c, which is the axial rear end face of the sensor casing 113b, and the joint face, which is the front end face of the cover portion 141 serving as the sensor cover, are joined. The flow path casing portion 142 of the cover/casing unit 140 has a rectangular shape and includes a rectangular intermediate space 142c. The flow path casing part 142 is open toward the rear side in the axial direction, and a relay space 142c is arranged on the front side of this opening.

Each of the sensor casing 113b and the cover and casing unit 140 comprises an axially extending first fluid passage (113f, 142a) and an axially extending second fluid passage (113g, 142b). In addition, a coolant such as cooling water is provided in the first liquid path 113f and the second liquid path 113g of the sensor casing 113b, the first liquid path 142a and the second liquid path 142b of the cover/casing unit 140, and the relay space 142c. is washed away.

A communication port opening toward the rear side is provided at the axial rear end of each of the first liquid passage 113f and the second liquid passage 113g of the sensor casing 113b. On the other hand, the front end of each of the first fluid path 142a and the second fluid path 142b of the cover/casing unit 140 is provided with a communication port that opens toward the front side. When the cover/casing unit 140 is fixed to the sensor casing 113b, the first fluid path 142a of the cover/casing unit 140 and the first fluid path 113f of the sensor casing 113b communicate with each other through the communication port. . In addition, the second fluid path 142b of the cover/casing unit 140 and the second fluid path 113g of the sensor casing 113b communicate with each other through the communication port.

A ring-shaped ring groove 113d recessed toward the axial front side and a crescent-shaped gasket capture groove 113e recessed toward the axial front side are arranged on the joint surface 113c of the sensor casing 113b. . 113 d of ring grooves are arrange|positioned in the aspect surrounding the communication opening of 113 f of 1st liquid paths of the sensor casing 113b. A first O-ring 131 is fitted in the ring groove 113d.

The first O-ring 131 surrounds the communication opening of the first fluid passage 113f of the sensor casing 113b and the communication opening of the first fluid passage 142a of the cover/casing unit 140, respectively. In addition, the first O-ring 131 is interposed between the joint surface 113 c of the sensor casing 113 b and the joint surface of the cover portion 141 of the cover/casing unit 140 . As a result, leakage of refrigerant from the communication port of the first liquid passage 113f of the sensor casing 113b and the communication port of the first liquid passage 142a of the cover/casing unit 140 through the gap between the two joint surfaces is suppressed.

A ring-shaped ring groove 113h recessed toward the front side in the axial direction is arranged on the joint surface 113c of the sensor casing 113b. The ring groove 113h surrounds the communication port of the second liquid path 113g. A second O-ring 132 is fitted in the ring groove 113h. The second O-ring 132 surrounds the communication opening of the second fluid passage 113g of the sensor casing 113b and the communication opening of the second fluid passage 142b of the cover/casing unit 140, respectively. In addition, the second O-ring 132 is interposed between the joint surface 113 c of the sensor casing 113 b and the joint surface of the cover portion 141 of the cover/casing unit 140 . As a result, leakage of refrigerant from the communication opening of the second liquid passage 113g of the sensor casing 113b and the communication opening of the second liquid passage 142b of the cover/casing unit 140 through the gap between the joint surfaces is suppressed.

A relay connector 143 is fixed to the axial rear end face of the cover portion 141 of the cover/casing unit 140 . Sensor connector 130a of rotation detection sensor 130 and relay connector 143 are electrically connected by a harness (not shown).

FIG. 4 is a plan view showing the second housing 113 from the rear side in the axial direction. In the figure, the sealing material 129 made of a solidified liquid gasket is hatched for easy understanding. A sealing material 129 made of a solidified liquid gasket is arranged on the joint surface 113c of the sensor casing 113b so as to surround the hollow 113b-1 of the sensor casing 113b with a predetermined width. The sealing material 129 is interposed between the joint surface 113c of the sensor casing 113b and the joint surface of the cover portion (141 in FIG. 3) of the cover/casing unit (140 in FIG. 3). By sealing the hollow of the sensor casing 113b with this intervention, the airtightness of the hollow can be improved at low cost. In addition, in FIG. 1, the sealing material 129 is hatched for convenience, but the hatching does not indicate the cross section of the sealing material 129 .

In the joint surface 113c of the sensor casing 113b, the gasket capture groove 113e is arranged between the sealing material 129 and the first O-ring 131 in the planar direction. The liquid gasket applied to the joint surface 113c of the sensor casing 113b solidifies to form the sealing material 129. As shown in FIG. When the joint surface 113c of the sensor casing 113b and the joint surface of the cover portion 141 of the cover/casing unit 140 are joined together, the liquid gasket spreads in the planar direction between the joint surfaces. Even if the liquid gasket expands in this manner, the expanded portion of the liquid gasket flows into the gasket capture groove 113e before reaching the first O-ring 131, and further expansion is prevented. In this manner, the gasket capture groove 113e suppresses adhesion of the liquid gasket to the first O-ring 131, thereby suppressing deterioration of the first O-ring 131 due to adhesion of the liquid gasket.

FIG. 5 is an exploded perspective view showing the second housing 113, the cover/casing unit 140, and the switching unit 162 from the axial rear side. FIG. 6 is a perspective view showing the switching unit 162. As shown in FIG. FIG. 7 is a cross-sectional view showing the second housing 113. As shown in FIG.

A joint surface 142 e is arranged at the rear end of the flow path casing portion 142 of the cover/casing unit 140 . A switching unit 162 is bonded to the bonding surface 142e. Specifically, a plurality of female screw holes 142d are arranged on the joint surface 142e, and a male screw 169 is screwed into each of the female screw holes 142d, whereby the switching unit 162 is screwed to the joint surface 142e. and spliced. This joining closes the opening of the flow path casing 142 of the cover/casing unit 140 .

The switching unit 162 includes an electronic substrate 163 and a terminal block 164 made of insulating resin. A plurality of high-speed switching elements 165 such as IGBTs (Insulated Gate Bipolar Transistors) are mounted on the mounting surface of the electronic substrate 163 . The terminal block 164 is fixed to the surface opposite to the mounting surface of the electronic board 163 .

A control board (not shown) is arranged in the inverter space of the second housing 113 . This control board and the relay connector 143 are electrically connected by a harness (not shown). Through this electrical connection, a detection signal from the rotation detection sensor 130 is sent to the control board via the relay connector 143 .

The terminal block 164 includes three DC anode terminals 164a and three DC cathode terminals 164b. The terminal block 164 also includes a U-phase terminal 164U, a V-phase terminal 164V, and a W-phase terminal 164W for an AC three-phase power supply. Each of the three DC anode terminals 164a is connected to the anode of the DC external power supply (the battery described above). A cathode of a DC external power supply is connected to each of the three DC cathode terminals 164b. The switching unit 162 converts DC power supplied from an external DC power supply into AC three-phase power of any frequency. U-phase, V-phase and W-phase in the AC three-phase power supply are output from U-phase terminal 164U, V-phase terminal 164V and W-phase terminal 164W.

U-phase terminal 164U, V-phase terminal 164V, and W-phase terminal 164W are connected via a U-phase relay bus bar (not shown), a V-phase relay bus bar (not shown), and a V-phase relay bus bar (not shown). . The U-phase, V-phase and W-phase are sent to the coils of the stator 107 of the motor section 102 via the U-phase busbar 161U, the V-phase busbar 161V and the W-phase busbar 161W.

On the rear side surface of the partition wall 113a of the second housing 113, there are arranged a liquid inflow path 113j (see FIG. 7) which is hollow in the housing and a liquid outflow path 113k (see FIG. 7) which is hollow in the housing. The liquid inflow path 113j communicates with the second liquid path 113g of the sensor casing 113b. Also, the liquid outflow path 113k communicates with the first liquid path 113f of the sensor casing 113b. As indicated by arrows in FIG. 7, coolant such as cooling water sent from the outside flows into the liquid inflow path 113j. The refrigerant that has flowed in flows through the second fluid path 113g of the sensor casing 113b and the second fluid path 142b of the cover/casing unit 140 into the intermediate space 142c. Furthermore, the refrigerant in the relay space 142142c flows out to the outside through the first liquid passage (142a in FIG. 3) of the cover/casing unit 140, the first liquid passage 113f of the sensor casing 113b, and the liquid outflow passage 113k. do.

The switching unit 162 heats up by driving a plurality of high-speed switching elements 165 . On the other hand, the coolant flowing through the relay space 142 directly cools the switching unit 162 by directly contacting the rear surface of the terminal block 164 of the switching unit 162 and heading toward the first liquid passage (142a in FIG. 3). Such direct cooling effectively cools the switching unit 162 .

Although an example in which the present invention is applied to the motor 1 has been described, the present invention may be applied to a generator (dynamo). The present invention is not limited to the above-described embodiments, and configurations different from the embodiments can be employed within the scope of application of the configurations of the present invention. The present invention provides unique effects for each of the aspects described below.

[First aspect]
A first aspect includes a casing (e.g., sensor casing 113b) and a cover (e.g., cover portion 141) that covers an opening of the casing. and a sealing material (e.g., a sealing material 129) and an O-ring (e.g., a first O-ring 131) interposed between the joint surfaces, and each of the liquid paths forms a communication port at the joint surface. The electrical equipment ( For example, in the motor 1), the casing is a sensor casing that houses a sensor (for example, the rotation detection sensor 130), and the communication port and the O-ring each have a frame shape in the planar direction of the joint surface. A groove (e.g., gasket capture groove) disposed outside the frame of the sealing material having a shape, and at least one of the sensor casing and the cover is disposed between the sealing material and the O-ring in the planar direction of the joint surface. 113e) on the joint surface.

According to the first aspect of such a configuration, the O-ring can suppress coolant leakage from the joint between the sensor casing and the cover. In addition, according to the first aspect, the groove arranged on the joint surface of the sensor casing suppresses adhesion of the liquid gasket to the O-ring, thereby suppressing deterioration of the O-ring due to adhesion of the liquid gasket. Further, according to the first aspect, the sealing material interposed between the joint surface of the sensor casing and the joint surface of the cover can increase the airtightness of the inside of the sensor casing at low cost. Furthermore, according to the first aspect, even if the refrigerant in the liquid path leaks from the gap between the O-ring and the sensor casing or the cover, the sealing material can prevent the refrigerant from entering the sensor casing.

[Second aspect]
A second aspect has the configuration of the first aspect, and the sensor casing and the cover each communicate with each other in addition to the first fluid path serving as the fluid path and the first O-ring serving as the O-ring. a second O-ring interposed between the joint surfaces while enclosing the communication openings of the two fluid paths and the respective second fluid paths; The electrical device is arranged within the frame of the sealing material having a rectangular shape.

According to the second aspect, the coolant can flow through the second liquid path that is independent of the internal space of the sensor casing within the frame of the sealing material.

[Third aspect]
A third aspect has the configuration of the second aspect, and the end of the cover opposite to the joint surface of the first liquid passage and the joint surface of the cover of the second liquid passage opposite to the joint surface The electrical device is characterized in that the side ends and the ends communicate with each other.

According to the third aspect, the refrigerant can flow in a predetermined direction through the first liquid passage and the second liquid passage.

[Fourth aspect]
An electrical device according to any one of the first to third aspects, wherein the electrical device is a motor, and the sensor is a rotation detection sensor (for example, rotation detection sensor 130) that detects rotation of a rotor of the motor. A motor characterized by:

1: Motor (Electrical Device) 112: First Housing 113: Second Housing 113e: Gasket Capturing Groove (Groove) 113f: First Fluid Path 113g: Second Fluid Path 142a: First Fluid Path 142b: Second liquid path 142c: Intermediate space 129: Sealing material 130: Rotation detection sensor (sensor) 131: First O-ring (O-ring)

Claims (4)

A casing and a cover covering the opening of the casing,
Each of the casing and the cover includes a joint surface that is joined to each other, a liquid path that serves as a coolant flow path, and a sealing material and an O-ring that are interposed between the respective joint surfaces,
each of the liquid paths opens as a communication port at the joint surface and communicates with each other;
The electrical device is arranged such that the O-ring is interposed between the casing and the cover and surrounds the communication ports of the two liquid paths communicating with each other,
the casing is a sensor casing housing a sensor;
Each of the communication port and the O-ring is arranged outside the frame of the frame-shaped sealing material in the surface direction of the joint surface,
The electric device, wherein at least one of the sensor casing and the cover has a groove in the joint surface arranged between the sealing material and the O-ring in the planar direction of the joint surface. Each of the sensor casing and the cover includes, in addition to the first liquid passage as the liquid passage and the first O-ring as the O-ring, second liquid passages communicating with each other and communication ports of the respective second liquid passages. A second O-ring interposed between the joint surfaces while surrounding the
The electric device according to claim 1, wherein each of said second liquid passages and said second O-ring is arranged within a frame of said sealing material having a frame-like shape. An end of the first liquid passage of the cover opposite to the joint surface and an end of the second liquid passage of the cover opposite to the joint surface communicate with each other. 3. The electrical equipment according to item 2. Equipped with the electrical equipment according to any one of claims 1 to 3,
the electric device is a motor,
A motor, wherein the sensor is a rotation detection sensor that detects rotation of a rotor of the motor.

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