TWI612759B - Canned motor and vacuum pump - Google Patents

Abstract

An object of the present invention is to reduce the thickness of a sealed outer casing made of resin. A sealed motor that is connected to a vacuum pump and used as a rotary drive source of a vacuum pump includes a stator core, a rotor disposed inside the stator core, and a non-conductive sealed casing disposed between the stator core and the rotor. The stator core and the rotor are isolated from each other, and the sealed casing is made of a resin, a ceramic, or a composite material of the materials. The sealed outer casing is joined to the stator core by a bonding agent.

Description

Sealed motor, vacuum pump

The present invention relates to a canned motor.

In the related art, for example, a vacuum pump including the motor described in Patent Document 1 below is known. This vacuum pump is widely used for exhaust gas of a processing gas in a vacuum chamber of a semiconductor process.

In the motor for the vacuum pump, in order to seal the vacuum pump, a rotor chamber for isolating the motor stator and the motor rotor is formed, and the rotor chamber is fixed by the partition wall of the vacuum pump side (ie, borrowing The sealed casing (can) is a space sealed with respect to the stator of the motor. Thus, an electric motor having a structure in which a motor stator and a motor rotor are isolated by a sealed casing is referred to as a sealed motor. The sealed motor is typically disposed at the end of a pump rotor of the vacuum pump and is directly coupled to the pump rotor.

In the sealed motor, conventionally, a sealed casing made of a non-magnetic metal such as a thin stainless steel is used. However, in the case of using a sealed case made of a non-magnetic metal, eddy current is generated on the surface due to the action of the magnetic flux from the motor stator, and the motor efficiency is lowered due to the loss at this time. On the other hand, although it is also made of resin. In the case of sealing the outer casing member, in order to maintain the mechanical strength of the partition wall, the partition wall used has a plate thickness larger than that of the metal sealed outer casing member. For example, in the case of a chemical liquid output pump, in general, pressure fluctuation is hardly caused by decompression inside the motor stator, and pressure on the atmospheric pressure side around the motor in the compression direction is generated for the sealed outer casing member. The changes are only slightly different. It can also be said that the sealed outer casing member is usually applied with a pressure in a direction in which it expands outward, and at this time, the applied pressure is supported by the stator core located on the outer circumference of the sealed outer casing member, so even a relatively thin sealed outer casing member is also There will be no expansion and rupture. On the other hand, in the sealed motor for a vacuum pump, a large pressure in the compression direction acts directly on the sealed outer casing member due to a pressure difference between the vacuum region in the rotor chamber and the motor generated during the operation. In other words, the sealed outer casing member is subjected to a large tensile force toward the inner side of the rotor. Therefore, in the sealed motor for a vacuum pump, in order to prevent the sealed outer casing member from being bent and deformed in the radial direction inner side due to the compressive force, the strength of the sealed outer casing member is increased by increasing the thickness of the sealed outer casing member.

In a sealed motor having a sealed outer casing made of a resin, when the thickness of the sealed outer casing is too small, the mechanical strength of the sealed outer casing is lowered, and the pressure fluctuation of the vacuum pump cannot be withstood. Therefore, there is a limit to the thickness of the sealing member. The thickness of the sealed outer casing made of resin is usually set in accordance with the pressure vessel calculation method described in JIS B8267 or the like, and is about 1.5 to 2.0 mm.

(previous technical literature) (Patent Literature)

Patent Document 1: Japanese Laid-Open Patent Publication No. 2005-184958.

Patent Document 2: Japanese Laid-Open Patent Publication No. 2011-101594.

Patent Document 3: Japanese Laid-Open Patent Publication No. Hei 11-89158.

Patent Document 4: Japanese Laid-Open Patent Publication No. 2003-153494.

Patent Document 5: Japanese Laid-Open Patent Publication No. Hei 10-52002.

Patent Document 6: Japanese Laid-Open Patent Publication No. Hei 5-223098.

Patent Document 7: Japanese Laid-Open Patent Publication No. SHO 61-231848.

According to the above, in the sealed motor including the resin sealed case, it is required to reduce the isolation distance between the motor stator and the motor rotor to improve the motor characteristics. Further, in the sealed motor, since the motor rotor is unilaterally supported by the pump bearing, when the overhang of the distance between the pump bearing and the end portion of the sealed motor and the pump bearing opposite side becomes long, The mechanical strength required to produce the pump spindle is increased, or vibrations are easily generated. Therefore, it is required to reduce the overhang of the sealed motor. Further, in the general problem of the vacuum pump, it is required to easily manufacture, reduce the burden of maintenance management, and the like.

The present invention has been made in order to solve at least some of the above problems, and can be realized, for example, by the following aspects.

An embodiment of the present invention provides a sealed motor that is coupled to a vacuum pump and used as a rotary drive source of a vacuum pump. The secret The motor has a stator core; the rotor is disposed inside the stator core; and the non-conductive sealed casing is disposed between the stator core and the rotor and is isolated from the stator core. The stator core and the rotor are made of a resin, ceramics, or a composite material of the materials. The sealed outer casing is joined to the stator core by a bonding agent.

An embodiment of the present invention provides a sealed motor that is coupled to a vacuum pump and used as a rotary drive source of a vacuum pump. The sealed motor includes a stator core, a rotor disposed inside the stator core, and a resin sealed casing disposed between the stator core and the rotor and isolating the stator core and the rotor. The sealed casing has a hollow body portion that extends toward the central axis of rotation of the rotor. At least one of the surface on the outer diameter side and the surface on the inner diameter side of the body portion is inclined with respect to the rotation center line in at least a part of the range of the opposing direction of the stator core in the direction of the rotation center axis It is approximately horizontal at 0.5 degrees.

According to an embodiment of the present invention, there is provided a sealed motor in which a stator and a rotor are separated by a cylindrical resin partition wall covering an inner peripheral portion of a stator and used for rotational driving of a vacuum pump, the sealed motor being a peripheral portion of the partition wall An engaging portion that meshes with the magnetic pole tooth portion of the stator in the radial direction is formed.

An embodiment of the present invention provides a sealed motor that is coupled to a vacuum pump and used as a rotary drive source of a vacuum pump. The sealed motor includes: a stator core; a rotor disposed inside the stator core; and a sealed outer casing disposed between the stator core and the rotor, and isolating the stator core and the rotor, the sealed casing having a hollow shape Body part, The opening extends in the direction of the rotation center axis of the rotor; and the opening forms an opening of the body portion on the first side of the side directly connected to the vacuum pump among the directions of the rotation center axis. The stator core and the rotor are hermetically sealed by a sealed outer casing and an O-ring disposed along the circumferential direction on the outer surface of the opening of the sealed outer casing.

1-20, 2-20, 4-20‧‧‧ vacuum pumps

1-30, 1-120‧‧‧ rotor

1-32‧‧‧2nd rotor

1-33‧‧‧3rd rotor

1-34, 4-34‧‧‧ pump spindle

1-40‧‧‧ Cover

1-50, 1-60, 4-50, 4-50a‧‧‧ bearing components

1-51, 1-61‧‧‧ bearing

1-70‧‧‧ Timing gear

1-100, 2-100‧‧‧ motor

1-110, 2-110‧‧‧ Stator

1-111, 1-411, 1-511‧‧‧ stator core

1-112, 1-113‧‧‧ coil part

1-130, 1-230, 1-330, 1-430, 1-530‧‧‧ Sealed enclosure

1-131, 1-231, 2-131, 3-181‧‧‧ Body Department

1-132, 1-232, 1-332, 4-132, 4-232‧‧‧ occlusion

1-133, 1-233, 2-133‧‧‧ openings

1-140, 2-140, 4-140, 4-140a‧‧‧ Stator bracket

1-141, 2-141, 4-141, 4-141a‧‧‧ bracket body

1-142, 2-142, 4-142‧‧‧ side panels

1-145, 1-147, 2-145‧‧‧ recess

1-146, 2-146, 4-146a‧‧‧ protruding parts

1-150, 1-160‧‧‧ reinforcing members

1-153, 1-154, 2-153‧‧‧O-ring

1-161, 4-234‧‧‧ Part 1

1-162, 4-235‧‧‧Part 2

1-163‧‧‧3rd part

1-171, 1-172‧‧‧Resin

1-234‧‧‧ ribs

1-481, 1-581‧‧‧ bonding agent

1-482‧‧‧Bottom

1-515‧‧‧ teeth

1-512, 4-112‧‧‧ coil

1-516‧‧‧ Space

1-585‧‧‧ components

2-30, 2-120‧‧‧ rotor

2-111, 3-22, 4-111‧‧‧ stator core

2-112, 2-113‧‧‧ coil part

2-130, 4-130, 4-130a, 4-230‧‧‧ sealed enclosure

2-134‧‧‧1st Body Department

2-134a‧‧‧ outside

2-134b‧‧‧ inside

2-135‧‧‧2nd Body Department

2-210‧‧‧Top side

2-211‧‧‧Top

2-221‧‧‧ below

3-3‧‧‧ pump housing

3-16-1, 3-16-2‧‧‧ rotor

3-11, 4-110, 4-110a‧‧‧ Stator

3-16’-1, 3-16’-2‧‧ Axis

3-17-1, 3-17-2‧‧‧ rotor room

3-18-1, 3-18-2, 3-18-1'‧‧‧ partition wall

3-19‧‧‧ permanent magnet

3-20‧‧‧Magnetic tooth

3-21‧‧‧ Winding

3-20-2, 3-20-2’‧‧‧ Extension

3-20-1‧‧‧Magnetic pole base

3-30‧‧‧ slots

3-182'‧‧‧Open end

3-182, 3-183‧‧‧ end

3-184‧‧‧Ring flange

3-185, 3-185', 3-285, 3-385, 3-485‧‧ ‧ protrusions

3-185-1‧‧‧ base

3-185-2‧‧‧Extension

3-185-3, 3-185'-3, 3-385-3, 3-485-3‧‧‧Interface

3-185-4, 3-185'-4‧‧‧ front end face

3-186‧‧‧Ditch

3-187‧‧‧Winding Holder

3-288‧‧‧Rectangular ditch

3-388‧‧‧Triangular ditch

3-488‧‧‧Arc ditch

4-30, 4-120, 4-120a‧‧‧ rotor

4-100, 4-100a‧‧‧ motor

4-131, 4-131a, 4-231‧‧‧ Body Department

4-133, 4-133a, 4-233‧‧‧ openings

4-134‧‧‧ Section

4-143, 4-144, 4-52a‧‧‧ recess

4-151, 4-152, 4-151a‧‧ O-ring

4-236‧‧‧ ribs

AR‧‧‧Rotation center axis

C‧‧‧ center axis

FR‧‧‧relative range

M‧‧‧Motor

P‧‧‧ pump

PM‧‧‧Processed products

S1‧‧‧ outside side

S2‧‧‧ link side

W1, W2‧‧‧ width

Fig. 1 is an explanatory view showing a schematic configuration of a vacuum pump according to Embodiment 1-A of the present invention.

Fig. 2 is an explanatory view showing a schematic configuration of a sealed motor as the embodiment 1-A.

Fig. 3(A) is an explanatory view showing a configuration of a sealed casing as a sealed motor of the embodiment 1-B.

Fig. 3(B) is an explanatory view showing a configuration of a sealed casing as a sealed motor of the embodiment 1-B.

Fig. 4 is a partial cross-sectional view showing the configuration of a sealed casing as a sealed motor of the embodiment 1-C.

Fig. 5 is a cross-sectional view showing the structure of the joint of the sealed casing of the embodiment 1-D and the stator core.

Fig. 6 is a cross-sectional view showing the structure of the joint of the sealed casing of the embodiment 1-E and the stator core.

Fig. 7 is an explanatory view showing a schematic configuration of a sealed motor as the embodiment 2-A.

Fig. 8 is an explanatory view showing a method of manufacturing a sealed casing.

Fig. 9 is a perspective view showing the details of the partition wall of the embodiment 3-A.

Fig. 10 is a perspective view showing another configuration example of the partition wall.

Figure 11 is a cross-sectional view of the motor in the radial direction.

Fig. 12 is a partially enlarged view of Fig. 11.

Figure 13 is a partial cross-sectional view showing the details of the partition walls.

Fig. 14 is a partial cross-sectional view showing another example of the meshing portion of the partition wall.

Fig. 15 is a partial cross-sectional view showing another example of the meshing portion of the partition wall.

Fig. 16 is a partial cross-sectional view showing another example of the meshing portion of the partition wall.

Fig. 17 is a partial cross-sectional view showing another example of the meshing portion of the partition wall.

Fig. 18 is an explanatory view showing a schematic configuration of a sealed motor as the embodiment 4-A.

Fig. 19 is an explanatory view showing a schematic configuration of a sealed motor as a comparative example.

Fig. 20 is an explanatory view showing the configuration of a sealed casing as a sealed motor of the embodiment 4-B.

Fig. 21 is a view of the sealed casing viewed from the opening side.

1. The first embodiment group:

An embodiment of the present invention provides a connection to a vacuum pump and as A sealed motor used for the rotary drive of a vacuum pump. The sealed motor includes: a stator core; a rotor disposed inside the stator core; and a non-conductive sealed casing disposed between the stator core and the rotor and in contact with the stator core The stator core and the rotor are isolated, and the sealed casing is made of a resin, ceramics, or a composite material of the materials. The sealed outer casing is joined to the stator core by a bonding agent.

According to the sealed motor, since the sealed casing abuts against the stator core and is joined by the bonding agent, the sealed casing and the stator core are integrally formed. Therefore, the stator core can reinforce the mechanical strength of the sealed casing at a position corresponding to the stator core, and accordingly, the thickness of the resin-made sealed casing at the position can be reduced. As a result, the motor characteristics can be improved.

An embodiment of the present invention provides a sealed motor that is coupled to a vacuum pump and used as a rotary drive source of a vacuum pump. The sealed motor includes: a stator core; a rotor disposed inside the stator core; and a non-conductive sealed casing disposed between the stator core and the rotor and in contact with the stator core The stator core and the rotor are isolated, and the sealed casing is made of a resin, a ceramic, or a composite material of the materials. The sealed casing is joined to the stator core by a bonding agent formed on the outer surface of the sealing casing, and the primer layer is formed by a non-conductive material having a higher affinity with the bonding agent than the sealing casing.

According to the sealed motor, since the joint strength between the stator core and the sealed casing is improved, the stator core can further reinforce the mechanical strength of the sealed casing. As a result, the resin can be further reduced The thickness of the sealed enclosure.

In one embodiment of the present invention, the sealed motor may further include a reinforcing member disposed on the outer side of the stator core in the direction of the rotation center axis of the rotor, and the reinforcing member abuts on the outer surface of the sealed casing in the circumferential direction. According to this aspect, even in the region on the outer side of the stator core, the reinforcing member can reinforce the mechanical strength of the sealed casing, and accordingly, the thickness of the resin-made sealed casing at the position can be reduced.

In an embodiment of the invention, the sealed casing can also be joined to the reinforcing member by a bonding agent. According to this aspect, since the sealed outer casing and the reinforcing member are integrally formed, the mechanical strength of the sealed outer casing in the outer side region of the stator core can be further enhanced, and accordingly, the resin sealed outer casing at the position can be reduced. thickness.

In an embodiment of the present invention, the sealed casing can also be joined to the stator core by a bonding agent through the underlayer formed on the outer surface of the sealed casing. The primer layer can also be formed by a non-conductive material having a higher affinity to the bonding agent than the sealing case. According to this aspect, since the joint strength between the reinforcing member and the sealed casing is improved, the reinforcing member can further reinforce the mechanical strength of the sealed casing, and the thickness of the sealed casing made of resin can be further reduced.

In an embodiment of the present invention, the linear expansion coefficient of the reinforcing member may be equal to or less than the linear expansion coefficient of the stator core. According to this embodiment, it is possible to reduce the stress which is generated by the driving of the vacuum pump and causes the reinforcing member to act from the reinforcing member to the sealed casing during thermal expansion. Therefore, it is possible to reduce the mechanical strength required to seal the outer casing, and as a result, it is possible to reduce Less sealing shell thickness.

In one embodiment of the present invention, in the stator core, the space between the end portions on the inner peripheral side of the plurality of teeth protruding toward the center of the stator core can be engaged with the teeth. Non-conductive member. According to this embodiment, since the joint area of the bonding agent is increased, the joint strength between the stator core and the sealed casing can be improved. Therefore, the stator core can further reinforce the mechanical strength of the sealed casing, and can further reduce the thickness of the resin-made sealed casing.

In one embodiment of the present invention, the sealed motor can further include a stator holder that fixes the stator core in a state in which the stator core is embedded in the inner space of the stator holder, and the stator bracket is attached to the rotation center axis of the rotor The direction is formed to be longer than the stator core; and the resin is filled in a region formed between the stator bracket and the sealed casing, the region protruding from the both ends in the direction from the central axis of rotation of the stator core toward the outside of the stator core The area corresponding to the coil portion. According to this embodiment, the mechanical strength of the sealed casing can be further enhanced by the resin to be filled, and accordingly, the thickness of the sealed casing made of resin in this position can be reduced.

In an embodiment of the present invention, the linear expansion coefficient of the resin to be filled can be equal to or lower than the linear expansion coefficient of the stator core. According to this embodiment, when the heat of compression is generated by the driving of the vacuum pump and the resin to be filled is thermally expanded, the stress applied from the filled resin to the sealed casing through the reinforcing member can be reduced. Therefore, the mechanical strength required to seal the outer casing can be reduced, and as a result, the thickness of the sealed outer casing can be reduced.

In an embodiment of the invention, the sealed outer casing can also It is preferable that the hollow body portion extends in the direction of the rotation center axis of the rotor, the closing portion is formed on the first side of the rotation center axis direction and closes the internal space of the body portion, and the opening portion forms the body portion It belongs to the opening on the second side opposite to the first side. The closing portion can also include a portion where the inner diameter is reduced in diameter from the second side toward the first side. According to this embodiment, the volume inside the sealed casing is reduced, and as a result, the amount of gas movement between the inside of the sealed casing and the vacuum pump (pump chamber) is reduced when the vacuum pump is driven. That is, the amount of gas passing through the bearing portion provided between the inside of the sealed casing and the pump chamber is reduced. Therefore, it is possible to suppress the lubricant from decreasing as the gas moves, and it is possible to reduce the burden of maintaining the management of the vacuum pump.

In an embodiment of the present invention, the closing portion may have a dome shape in which the central portion is convex from the second side toward the first side. According to this embodiment, the mechanical strength of the closing portion can be improved. Further, the thickness of the occluding portion can be reduced by this. When the thickness of the closing portion is reduced, the difference in thickness between the body portion and the closing portion is reduced, so that it is easy to produce a sealed case made of resin by injection molding.

In an embodiment of the present invention, the rib may be formed on at least one of the first side surface and the second side surface of the closing portion. According to this embodiment, the mechanical strength of the closing portion can be improved. Further, the thickness of the occluding portion can be reduced by this. Further, in the case of injection molding, the molded article is left in the inner mold (male mold) at the time of demolding after molding. Therefore, when the rib is formed on the surface on the second side of the closing portion, the molded article is easily caught in the inner mold, and as a result, it is easy to produce a sealed outer casing made of resin by injection molding.

One embodiment of the present invention provides a vacuum pump. The vacuum pump can also include the sealed motor of any of the above aspects.

An embodiment of the present invention provides a sealed motor that is coupled to a vacuum pump and used as a rotary drive source of a vacuum pump. The sealed motor includes: a stator core; a rotor disposed inside the stator core; and a sealed casing disposed between the stator core and the rotor and isolating the stator core in a state of abutting against the stator core With the rotor. The sealed casing may have a hollow body portion extending in the direction of the rotation center axis of the rotor, and the closing portion being the first side of the rotation center axis direction and closing the internal space of the body portion; and the opening portion An opening of the body portion belonging to the second side opposite to the first side is formed. The closing portion can also include a portion where the inner diameter is reduced in diameter from the second side toward the first side.

In an embodiment of the present invention, the closing portion may have a dome shape in which the center portion is convex from the second side toward the first side. In an embodiment of the present invention, the rib portion may be formed on at least one of a surface on the first side and a surface on the second side of the blocking portion. The above various embodiments can be arbitrarily combined.

Furthermore, an embodiment of the present invention provides a sealed motor that is coupled to a pump and used as a rotary drive source of a pump. The sealed motor includes: a stator core; a rotor disposed inside the stator core; and a non-conductive sealed casing disposed between the stator core and the rotor and in contact with the stator core The stator core and the rotor are isolated, and the sealed casing is made of a resin, a ceramic, or a composite material of the materials. The sealed outer casing is joined to the stator core by a bonding agent. Furthermore, an embodiment of the present invention provides a pump that is coupled to a pump and used as a rotary drive source for the pump. Seal the motor. The sealed motor includes: a stator core; a rotor disposed inside the stator core; and a non-conductive sealed casing disposed between the stator core and the rotor and in contact with the stator core The stator core and the rotor are isolated, and the sealed casing is made of a resin, a ceramic, or a composite material of the materials. The sealed outer casing is joined to the stator core by a bonding agent through a primer layer formed on the outer surface of the sealing outer casing, and the underlayer is formed by a non-conductive material having a higher affinity with the bonding agent than the sealing outer casing. An embodiment of the present invention provides a sealed motor that is coupled to a pump and used as a rotary drive source for a pump. The sealed motor includes: a stator core; a rotor disposed inside the stator core; and a sealed casing disposed between the stator core and the rotor and isolating the stator core in a state of abutting against the stator core With the rotor. The sealed casing has a hollow body portion extending in a direction of a rotation center axis of the rotor, a closing portion being formed on a first side of the rotation center axis direction and closing an internal space of the body portion, and an opening portion forming a body The portion belongs to the opening on the second side opposite to the first side. The closing portion includes a portion where the inner diameter is reduced in diameter from the second side toward the first side. The sealed motor of these embodiments can be applied to various pumps and is not limited to pumps. For example, the sealed motor of the embodiments can be applied to a liquid pump or a blower belonging to a generalized gas pump. Further, the sealed motor of the above embodiments can be arbitrarily combined with the above various embodiments obtained by application to a vacuum pump. Hereinafter, a more detailed embodiment of the first embodiment of the present invention will be described. In the following, a vacuum pump will be described as an example. However, the embodiment described below is not limited to a vacuum pump as described above.

1-A. Example 1-A

Fig. 1 shows a schematic cross section of the vacuum pump 1-20. In Fig. 1, a section including the rotation center axis AR of the vacuum pump 1-20 is shown. As shown in the figure, the vacuum pump 1-20 includes a pair of rotors 1-30 (only one of the rotors is shown in Fig. 1). In the present embodiment, the rotor 1-30 includes a first stage rotor 1-31, a second stage rotor 1-32, and a third stage rotor 1-33; and a pump main shaft 1-34. The rotor 1-30 is supported at its both end portions by bearings 1-51, 1-61 provided in the bearing members 1-50, 1-60. The rotor 1-30 is housed in the outer cover 1-40. An intake port (not shown) is formed above the outer cover 1-40, and an exhaust port (not shown) is formed below.

The rotor 1-30 is driven by a motor 1-100 provided on one end side of the rotation center axis AR of the vacuum pump 1-20. At the shaft end on one end side of the pair of rotors 1-30, a pair of timing gears 1-70 (only one of the gears shown in Fig. 1) are engaged with each other. The shaft end of the other end side of the rotor 1-30 is coupled to the motor 1-100. In the present embodiment, the motor 1-100 is a brushless DC motor. Further, the configuration of the motor 1-100 is simplified in the first drawing.

When the motor 1-100 is driven, the pair of rotors 1-30 will maintain a slight gap between the inner faces of the outer covers 1-40 and the rotors 1-30 to rotate in a non-contact direction in the opposite direction. As the pair of rotors 1-30 rotate, the gas on the suction side is enclosed between the rotor 1-30 and the outer cover 1-40 and transported to the delivery side. The gas introduced from the intake port (not shown) is compressed and transported by the three stages of the rotor 1-30, and is discharged from the exhaust port (not shown).

Fig. 2 shows a schematic configuration of a motor 1-100 that rotationally drives the rotor 1-30. In the following description, regarding the electric motor 1-100, the side connected to the vacuum pump 1-20 (more specifically, the rotor 1-30) among the rotation center axis AR directions is also referred to as a joint side S2, and will be referred to as a joint side S2. The opposite side of the joint side S2 is also referred to as the outer side S1. As shown in Fig. 2, the motor 1-100 includes a stator 1-110, a rotor 1-120, a sealed casing 1-130, a stator holder 1-140, and reinforcing members 1-150, 1-160.

The stator holder 1-140 is provided with a bracket body 1-141 and a side plate 1-142. The bracket body 1-141 has a cylindrical shape in which an internal space is formed along the rotation center axis line AR. The bracket body 1-141 is provided with a protruding portion 1-146. The protruding portion 1-146 is a portion that protrudes inward from the inner surface of the holder body 1-141, and is formed in a ring shape around the rotation center axis line AR in the vicinity of the end portion of the connection side S2 of the holder body 1-141. The protruding length of the protruding portion 1-146 is formed to be substantially equal to the protruding length of the opening portion 1-133 from the body portion 1-131 (described later in detail). The side plate 1-142 has a circular plate shape and closes an opening of the outer side S1 of the bracket body 1-141. A concave portion 1-145 is formed on an end surface of the outer side S1 of the bracket main body 1-141, and an O-ring 1-153 is disposed in the concave portion 1-145. The O-ring 1-153 is compressed between the bracket body 1-141 and the side plates 1-142 in the direction of the rotation center axis AR, and seals between the inside and the outside of the stator holder 1-140. Further, the side plates 1-142 are attached to the bracket body 1-141 by bolts (not shown). The stator holder 1-140 can be formed, for example, of iron or aluminum. The stator 1-110, the rotor 1-120, and the sealed casing 1-130 are housed in the internal space of the stator holder 1-140.

The stator 1-110 has a configuration in which a coil is mounted on the stator core 1-111. The coil portions 1-112 and 1-113 protrude toward the outside of the stator core 1-111 at both ends of the stator 1-110 in the central axis of rotation AR direction. The stator core 1-111 is fitted inside the bracket body 1-141 of the stator holder 1-140, whereby the stator 1-110 is fixed to the stator holder 1-140 in a concentric manner with the rotation center axis AR. The stator core 1-111 can be formed, for example, by laminating a bismuth steel plate. The rotor 1-120 is disposed inside the stator 1-110 in a concentric manner with the rotation center axis AR, and is directly coupled to the pump main shaft 1-34 of the rotor 1-30 of the vacuum pump 1-20.

A sealed casing 1-130 is provided between the stator 1-110 and the rotor 1-120. The sealed housing 1-130 isolates the stator 1-110 from the rotor 1-120. The sealed casing 1-130 includes a body portion 1-131, a closing portion 1-132, and an opening portion 1-133. The body portion 1-131 has a substantially cylindrical shape and is disposed concentrically with the rotation center axis line AR. The body portion 1-131 is formed to extend over the entire range of the arrangement of the stators 1-110 in the direction of the rotation center axis line AR.

The closing portion 1-132 is an end surface of the outer side S1 of the sealed casing 1-130, and the inner space of the body portion 1-131 is closed at the end surface of the outer side S1 of the body portion 1-131. The opening portion 1-133 is an end portion of the joint side S2 of the sealed casing 1-130, and forms an opening that seals the joint side S2 of the outer casing 1-130. In the present embodiment, the opening portion 1-133 has a flange shape in which the outer diameter is formed larger than the outer diameter of the body portion 1-131.

The sealed casing 1-130 is formed of a non-conductive resin, and the body portion 1-131, the closing portion 1-132, and the opening portion 1-133 are one. Physical formation. The material of the sealed casing 1-130 is not limited to a resin, and may be ceramic or a composite material of a resin and a ceramic. In the present embodiment, the material of the sealed casing 1-130 is PPS (polyphenylene sulfide) resin. The thickness of the body portion 1-131 and the opening portion 1-133 can be made thin, and specifically, for example, it can be 0.5 mm to 1.0 mm. The thickness of the closing portion 1-132 is formed to be larger than the thickness of the body portion 1-131, and can be, for example, 1.5 mm to 2.0 mm. From the viewpoint of improving the motor characteristics, the thickness of the body portion 1-131 is preferably as small as possible. Further, from the viewpoint of shortening the overhang of the distance between the bearing 1-51 and the end portion of the outer side S1 of the motor 1-100, the rotation center axis AR direction of the opening portion 1-133 (flange shape) The width is preferably as small as possible.

The sealed casing 1-130 is attached such that the stator core 1-111 and the body portion 1-131 are in contact with each other in the circumferential direction. Further, the stator core 1-111 and the body portion 1-131 are joined to the abutting portion by a bonding agent. In this manner, the stator core 1-111 and the body portion 1-131 are joined by the bonding agent, whereby the stator core 1-111 and the body portion 1-131 are integrally formed. Therefore, the stator core 1-111 can reinforce the mechanical strength of the body portion 1-131 at a position corresponding to the stator core 1-111. Thereby, in the position corresponding to the stator core 1-111, the thinning of the body portion 1-131 described above can be achieved. Further, in consideration of the heat resistance during the operation of the vacuum pump 1-20, a silicone type, an epoxy type or the like can be used as the bonding agent.

Further, the sealed casing 1-130 is attached to the end face of the connection side S2 of the protruding portion 1-146 and the outer side S1 of the opening portion 1-120. The end face is mounted in a state of abutment. At this time, the end surface of the inner side of the protruding portion 1-146 is in contact with the outer surface of the body portion 1-131 in the circumferential direction. The projection 1-146 has a positioning function of the direction of the rotation center axis AR of the sealed casing 1-130.

The reinforcing member 1-150 has an annular shape having an inner diameter substantially equal to the outer diameter of the body portion 1-131. The reinforcing member 1-150 is fitted to the rotation center axis line AR so as to be closer to the outside than the stator core 1-111 (the connection side S2) so that the reinforcing member 1-150 is in contact with the body portion 1-131 in the circumferential direction. The end of the outer side S1 of the reinforcing member 1-150 is in contact with the stator core 1-111, and the end of the connecting side S2 of the reinforcing member 1-150 is embedded and abutted on the protruding portion 1 - The notch shape of the outer side S1 of 146. The reinforcing member 1-150 is preferably a resin member or a non-magnetic metal member having a tensile strength of 100 MPa or more.

Further, the reinforcing member 1-150 and the body portion 1-131 are joined to the abutting portion of the reinforcing member 1-150 and the body portion 1-131 by a bonding agent. In this manner, the reinforcing member 1-150 and the body portion 1-131 are joined by the bonding agent, whereby the reinforcing member 1-150 and the body portion 1-131 are integrally formed. Therefore, the reinforcing member 1-150 can reinforce the mechanical strength of the body portion 1-131 even if it is closer to the coupling side S2 than the stator core 1-111. Thereby, the thinning of the body part 1-131 closer to the connection side S2 than the stator core 1-111 can be achieved. Further, the body portion 1-131 closer to the connection side S2 than the reinforcing member 1-150 is abutted against the protruding portion 1-146 to reinforce the mechanical strength. Of course, the body portion 1-131 and the protruding portion 1-146 can also be joined by a bonding agent.

The reinforcing member 1-160 includes a first portion 1-161, a second portion 1-162, and a third portion 1-163. The first portion 1-161 is an annular shape that is located closest to the coupling side S2 among the reinforcing members 1-160 and has an inner diameter substantially equal to the outer diameter of the body portion 1-131. The second portion 1-162 has a flange shape that extends concentrically outward from the first portion 1-161 in the radial direction. The third portion 1-163 has an annular shape extending from the end on the outer side of the second portion 1-162 toward the outer side S1.

The reinforcing member 1-160 is fitted to the rotation center axis line AR so as to be closer to the outside than the stator core 1-111 so that the first portion 1-161 and the body portion 1-131 are in contact with each other in the circumferential direction. At this time, the end portion on the outer side S1 side of the first portion 1-161 is located closer to the outer side S1 than the coil portion 1-113, and is located in the direction of the rotation center axis AR, and is sealed with the outer casing 1-1. The end portion on the outer side S1 side of the body portion 1-131 of 130 is at the same position. The end of the connection side S2 of the first portion 1-161 is in contact with the stator core 1-111. Further, the first portion 1-161 and the body portion 1-131 are joined to the abutting portion of the first portion 1-161 and the body portion 1-131 by a bonding agent. Therefore, the first portion 1-161 can reinforce the mechanical strength of the body portion 1-131 of the outer side S1 of the stator core 1-111. Thereby, the thinning of the body part 1-131 which is closer to the outer side S1 than the stator core 1-111 can be achieved.

Further, the length of the second portion 1-162 in the direction orthogonal to the rotation center axis line AR is formed to have the same length as the separation distance between the outer surface of the body portion 1-131 and the inner surface of the holder body 1-141. Therefore, the third portion 1-163 abuts against the inner surface of the holder body 1-141. By this structure Further, the reinforcing strength is closer to the mechanical strength of the body portion 1-131 of the outer side S1 than the stator core 1-111.

A recessed portion 1-147 is formed at a position corresponding to the third portion 1-163 of the bracket body 1-141, and an O-ring 1-154 is disposed in the recessed portion 1-147. The O-ring 1-154 is compressed between the bracket body 1-141 and the third portion 1-163 in a direction orthogonal to the rotation center axis line AR, and the joint side S2 and the outer side of the seal reinforcing member 1-160 are sealed. Between S1.

Further, around the coil portions 1-112 and 1-113, a sealed space is formed in a region between the holder main body 1-141 and the body portion 1-131, and the coil portions 1-112 and 1-113 are housed in the sealed portion. Inside a confined space. Specifically, the coil portion 1-112 on the side of the connection side S2 is housed in a space that is closed by the bracket body 1-141, the protruding portion 1-146, the reinforcing member 1-150, and the stator core 1-111. Further, the coil portion 1-113 on the outer side S1 side is housed in a space that is closed by the holder main body 1-141, the first portion 1-161, and the second portion 1-126. Resins 1-171, 1-172 are filled in the respective closed spaces. With this configuration, the mechanical strength of the body portion 1-131 in both end portions of the stator core 1-111 can be further enhanced.

In the motor 1-100, the linear expansion coefficient of the reinforcing members 1-150, 1-160 is preferably set to be equal to or less than the linear expansion coefficient of the stator core 1-111. Similarly, the linear expansion coefficient of the resin 1-171, 1-172 is preferably set to be equal to or less than the linear expansion coefficient of the stator core 1-111. As a result, heat shrinkage occurs due to driving of the vacuum pump 1-20, so that the reinforcing members 1-150, 1-160 or the resins 1-171, 1-172 are thermally expanded. At this time, the stress acting on the body portion 1-131 from the reinforcing members 1-150, 1-160 or the resins 1-171, 1-172 can be reduced. Therefore, the mechanical strength required for the body portion 1-131 can be reduced, and as a result, the thickness of the body portion 1-131 can be reduced. Further, for the same reason, the joint of the stator core 1-111 and the body portion 1-131 and the coefficient of linear expansion of the bonding agent used when joining the reinforcing members 1-150, 1-160 and the body portion 1-131, Preferably, it is set to be equal to or less than the linear expansion coefficient of the stator core 1-111. Further, similarly, the linear expansion coefficients of the reinforcing members 1-150, 1-160 and the resins 1-171, 1-172 are preferably set to be equal to or less than the linear expansion coefficient of the holder body 1-141, but usually the stent body 1 The linear expansion coefficient of -141 is equal to or higher than the linear expansion coefficient of the stator core 1-111. Therefore, the linear expansion coefficients of the reinforcing members 1-150, 1-160 and the resins 1-171, 1-172 are generally equal to the linear expansion coefficient of the stator core 1-111, and generally satisfy the linear expansion coefficient of the bracket body 1-141. the following.

According to the electric motor 1-100, the mechanical strength of the body portion 1-131 of the sealed sealed outer casing 1-130 can be reinforced by the various configurations described above, and accordingly, the thickness of the body portion 1-131 can be thinned. Therefore, the characteristics of the motor 1-100 are improved. Further, by making the thickness of the closing portion 1-132 of the sealed casing 1-130 thicker than the body portion 1-131, the mechanical strength required for the closing portion 1-132 can be secured.

The sealed casing 1-130 of the motor 1-100 can also be manufactured by injection molding. In the injection molding, in order to smoothly flow the resin into the cavity of the mold, the thickness of the molded article preferably has a certain degree of uniformity. Therefore, the sealed casing 1-130 can also be as follows Manufactured in the manner described. In other words, first, the body portion 1-131, the closing portion 1-132, and the opening portion 1-133 are formed by the thickness of the blocking portion 1-132, and then the body portion 1-131 and the opening can be opened by cutting or the like. The part 1-133 is thinned. Further, in terms of injection molding, it is used to smoothly release the mold after molding, and a slight oblique angle is set in the molded article. As described above, when the body portion 1-131 and the opening portion 1-133 are thinned by cutting or the like, the body portion 1-131 can be processed without causing the oblique angle. As a result, the body portion 1-131, the stator core 1-111, and the reinforcing members 1-150, 1-160 can be easily joined by the bonding agent.

1-B. Example 1-B:

Figs. 3(A) and 3(B) show the configuration of the sealed casing 1-230 as the vacuum pump of Example 1-B. As a vacuum pump of Example 1-B, only a part of the configuration of the sealed casing was different from that of Example 1-A, and other points were common to Example 1-A. Therefore, in the following, the sealing case 1-230 is only described with respect to the difference from Embodiment 1-A. The third (A) diagram is a partial cross-sectional view of the sealed casing 1-230. The third (B) diagram is a view in which the sealed casing 1-230 is viewed from the joint side S2.

The sealed casing 1-230 includes a body portion 1-231, a closing portion 1-232, and an opening portion 1-233 in the same manner as in the first embodiment. The occluding portion 1-232 has a slight rounded corner in the end portion on the side of connection with the body portion 1-231. On the inner surface of the closing portion 1-232, the rib portion 1-234 is dispersed in the circumferential direction from the end portion of the outer side S1 of the body portion 1-231 toward the vicinity of the central portion of the closing portion 1-232. The ribs 1-234 are gradually reduced in thickness from the end of the outer side S1 of the body portion 1-231, and are closed close to each other. The vicinity of the center portion of the plug portion 1-232 is formed. Therefore, the ribs 1-234 do not interfere with the mounting members of the rotors 1-30 such as bolts of the space disposed in the space near the rotation center axis AR among the internal spaces in the vicinity of the closing portion 1-232 of the sealed casing 1-230.

According to this configuration, the strength of the closing portion 1-232 can be increased. Further, accordingly, the thickness of the closing portion 1-232 can also be reduced. Therefore, as described above, when the molded article having the thickness of the closed portion 1-232 as a whole is produced by injection molding, and then the cutting process is performed to produce the sealed case 1-230, the thickness of the injection-molded molded article can be reduced, and as a result, Can reduce the amount of machining.

Further, according to this configuration, in the cross section of the portion where the rib portion 1-234 is formed, since the inner diameter is reduced in diameter from the connecting side S2 toward the outer side S1, the space inside the sealed outer casing 1-230 can be reduced accordingly. That is, the volume of the ribs 1-234 is reduced. As a result, the amount of gas movement between the inside of the sealed casing 1-230 and the vacuum pump 1-20 when the vacuum pump 1-20 is driven is reduced. That is, the amount of gas passing through the bearing 1-51 between the inner space of the sealed outer casing 1-230 and the inner space of the outer cover 1-40 of the vacuum pump 1-20 is reduced. Therefore, it is possible to suppress a decrease in the movement of the lubricant with the gas, and it is possible to reduce the burden of maintaining the management of the vacuum pump 1-20.

Further, in terms of injection molding, the molded article is left in the inner mold at the time of demolding after molding. According to the sealed casing 1-230, when the sealed casing 1-230 is produced by injection molding, the ribs 1-234 are formed in the sealed casing 1-230, so that the molded article is easily caught in the inner mold, and as a result, It becomes easy to manufacture the sealed casing 1-230.

1-C. Example 1-C

Fig. 4 is a partial cross-sectional view showing the configuration of a sealed casing 1-330 as a vacuum pump of the embodiment 1-C. As shown in the figure, the closing portion 1-332 of the sealed casing 1-330 has a dome shape in which the central portion is convex from the connecting side S2 toward the outer side S1. The inner surface of the blocking portion 1-332 has a shape that follows the outer surface. According to the sealed casing 1-330, the mechanical strength of the closing portion 1-332 can be further increased. Further, since the inner diameter of the closing portion 1-332 is reduced in diameter from the connecting side S2 toward the outer side S1, the same effect as in the first embodiment 1-B can be achieved. Of course, it is also possible to form the ribs in the sealed casing 1-330 in the same manner as in the embodiment 1-B.

1-D. Example 1-D

Fig. 5 is a cross-sectional view showing the joint of the sealed casing 1-430 and the stator core 1-411 which are vacuum pumps of the embodiment 1-D. As shown, in the present embodiment, the sealed casing 1-430 is joined to the stator core 1-411 by the bonding agent 1-481 through the underlayer 1-488 formed on the outer surface of the sealing casing 1-430. That is, the underlayer 1-482 is formed on the outer surface of the sealed case 1-430, and the underlayer 1-482 is bonded to the stator core 1-411 by the bonding agent 1-481. In the present embodiment, the underlayer 1-482 is formed only in the joint region with the stator core 1-411 in the outer surface of the sealed outer casing 1-430, but can also be formed throughout the sealed outer shell 1-430. The outer surface is overall.

The primer layer 1-482 can be formed by a variety of non-conductive materials having a higher affinity with the bonding agent 1-481 than the sealing case 1-430. to make. As such a non-conductive material, for example, polyimide and a crosslinking component can be used. The underlayer 1-482 can be formed by coating a paste material, or can be formed by plating or coating.

According to this configuration, even when the sealed casing 1-130 is formed of a material having a low affinity with the bonding agent 1-481, for example, an engineering plastic such as PPS, the stator core 1-411 can be lifted. The mechanical strength of the sealed outer casing 1-430 is such that the stator core 1-411 can well reinforce the mechanical strength of the sealed outer casing 1-430. As a result, the thickness of the sealed casing 1-430 can be reduced.

Further, the underlayer 1-482 can also be formed by a non-conductive material having a tensile strength greater than that of the sealed outer casing 1-430. For such a material, for example, a ceramic such as Al ₂ O ₃ can also be used. At this time, it is also possible to melt the ceramic on the surface of the sealed case 1-430 to form the underlayer 1-482. According to this configuration, the strength of the thinned sealed outer casing 1-430 can be enhanced.

Although not shown in the drawings, the configuration of the above-described Embodiment 1-D can be added, or alternatively, the sealed case 1-430 can pass through the underlayer 1-482 and the reinforcing member 1-150, 1 by the bonding agent 1-481. -160 (refer to Example 1-A) bonding. According to this configuration, since the joint strength between the reinforcing members 1-150, 1-160 and the sealed casing 1-430 is improved, the reinforcing members 1-150, 1-160 can further reinforce the mechanical strength of the sealed casing, and can The thickness of the sealed outer casing 1-430 is further reduced.

1-E. Example 1-E

Fig. 6 is a cross-sectional view showing the joint of the sealed casing 1-530 as the vacuum pump of the embodiment 1-E and the stator core 1-511. Figure 6 shows a section orthogonal to the central axis of rotation AR. As shown in the figure, the stator core 1-511 has a plurality of tooth portions 1-515 protruding toward the center of the stator core 1-511. The coils 1-512 are concentratedly wound in a plurality of teeth 1-515. A space 1-516 is formed between the end portions on the inner circumferential side of the plurality of tooth portions 1-515. Each of the spaces 1-516 is provided with a non-conductive member 1-585 that is engaged with the tooth portions 1-515 on both sides.

The members 1-585 have a wedge shape and are inserted into the inside of the stator core 1-511 in a manner of closing the spaces 1-516. In the present embodiment, the member 1-185 is formed of a glass epoxy resin. According to this configuration, the sealed case 1-530 and the tooth portions 1-515 of the stator core 1-511 are joined by the bonding agent 1-581. Further, among the spaces 1-516, the sealing case 1-530 and the members 1-585 are joined by the bonding agent 1-581. Since the member 1-185 is engaged with the tooth portion 1-515, the engagement of the sealing case 1-530 with the member 1-585 contributes to the improvement of the joint strength between the sealing case 1-530 and the stator core 1-511. Thus, the area of the bonding agent 1-581 becomes large, whereby the bonding strength between the sealing case 1-530 and the stator core 1-511 is improved, and the stator core 1-511 can further reinforce the mechanism for sealing the case 1-530. Sexual strength. As a result, the thickness of the sealed case 1-530 can be further reduced.

The resin can also be filled into the spaces 1-516 to form the members 1-585. Further, the filled resin can also be a bonding agent. At this time, the bonding agent preferably has heat resistance capable of withstanding the use temperature of the motor 1-100. Further, the bonding strength of the bonding agent is preferably 1kg / cm ² (0.098Mpa) above. These points are also the same in the bonding agent 1-581.

1-F. Variation 1-F:

1-F-1. Variation 1-F-1:

The inner diameter of the closed portion of the sealed casing shown in the embodiment 1-B or the embodiment 1-C, which is reduced in diameter from the connection side S2 toward the outer side S1, is not limited to the above example, and can be various. shape. For example, the shape of the occluding portion can be set to be conical, frustoconical, convex, or the like. In this case, the rib can also be formed on the outer side of the occluding portion. Of course, the ribs can also be formed on both the inner and outer faces of the occluding portion.

1-F-2. Variation 1-F-2:

The body portion 1-131 of the sealed casing 1-130 is not limited to the shape in which the entire body is thinned, and only a part of the whole body may be thinned. For example, only a portion of the body portion 1-131 that abuts against the stator core 1-111 can be made thinner. The sealed casing of this shape can also be manufactured by performing cutting work after injection molding.

2. The second embodiment group

An embodiment of the present invention provides a sealed motor that is coupled to a vacuum pump and used as a rotary drive source of a vacuum pump. The sealed motor includes a stator core, a rotor disposed inside the stator core, and a resin sealed casing disposed between the stator core and the rotor and isolating the stator core and the rotor. The sealed casing has a hollow body portion that extends toward the central axis of rotation of the rotor. At least one of the outer diameter side surface and the inner diameter side surface of the body portion is in phase with the stator core in the direction of the rotation center axis The inclination of at least a portion of the opposing ranges of the opposing directions is substantially horizontal with respect to the central axis of rotation of less than 0.5 degrees.

When a resin-made sealed casing is produced by injection molding, it is used to smoothly release the mold after molding, and a slight oblique angle is formed in the molded article. According to the sealed motor of the above aspect, since the oblique angle of the sealed casing is reduced, at least one of the sealed casing and the stator core and the rotor can be arranged in parallel. Therefore, the isolation distance between the stator and the rotor can be reduced. As a result, the motor characteristics can be improved.

In an embodiment of the present invention, the sealed casing can also have a thickness in a relative range smaller than a thickness in other portions. According to this embodiment, since the thickness of the opposing range is smaller than the thickness of the other portions, the separation distance between the stator and the rotor can be further reduced. In the relative range, the mechanical strength of the sealed casing is reinforced by the stator core, and the other portions are mechanically strengthened by the thickness of the casing itself, so that the mechanical strength of the entire casing can be ensured.

In one embodiment of the present invention, the sealed casing may be on the first side of the rotation center axis direction, and the thickness on the inner diameter side is larger than the relative range from the relative range. The first side on the opposite side to the one direction has a larger wall thickness than the relative range from the relative range. According to this embodiment, the molded article having the portion corresponding to the body portion is produced by injection molding, and then the thickness of the molded article at the processed portion is reduced by the molded article, and the amount of processing can be suppressed when the sealed casing is manufactured. Efficiency processing.

One embodiment of the present invention provides a vacuum pump. The vacuum pump can also be provided with any of the sealed motors of the above-described embodiments.

According to an embodiment of the present invention, a method of manufacturing a sealed casing for a sealed motor having a hollow body portion extending in a predetermined direction is provided. The method for producing the sealed casing includes an injection molding step of producing a molded article having a portion corresponding to the body portion by injection molding, and a processing step of forming an outer diameter side surface and an inner diameter side of the molded product At least one of the faces is machined to reduce the inclination of at least one of the faces with respect to the predetermined direction to produce a sealed outer casing. According to this aspect, the sealed casing provided in the sealed motor of the above aspect can be satisfactorily manufactured.

In an embodiment of the present invention, the processing step may include the step of reducing the inclination of at least one of the faces with respect to the predetermined direction. Further, in the processing step, the surface on the inner diameter side of the molded article can be processed on the first side of the molded article to reduce the thickness of the processed portion. Further, on the second side of the molded article, the surface on the outer diameter side of the molded article can be processed to reduce the thickness of the processed portion. According to this embodiment, it is possible to satisfactorily manufacture the sealed casing which is the first side among the directions of the rotation center axis, and the thickness of the inner diameter side is larger than the relative range from the relative range. On the second side opposite to the first direction, the thickness on the outer diameter side is larger than the relative range from the relative range.

An embodiment of the present invention includes the above-described injection molding step. Further, in place of the processing step of the above-described embodiment, a step of reducing at least one of the surface on the outer diameter side and the surface on the inner diameter side of the molded article may be employed to reduce the formation of the processed portion. The thickness of the product. According to this embodiment, it is produced by sealing only by injection molding. In the case of the case, the degree of freedom in the shape of the sealed casing can be increased. The above various embodiments can be arbitrarily combined.

Furthermore, an embodiment of the present invention provides a sealed motor. The sealed motor includes a stator core, a rotor disposed inside the stator core, and a resin sealed casing disposed between the stator core and the rotor and isolating the stator core and the rotor. The sealed casing has a hollow body portion that extends toward the central axis of rotation of the rotor. At least one of the outer diameter side surface and the inner diameter side surface of the body portion is inclined with respect to the rotation center line in a minimum portion of the range of the opposing direction of the stator core in the direction of the rotation center axis It is approximately horizontal at 0.5 degrees. The sealed motor of this embodiment can be applied to various pumps. For example, the sealed motor of this embodiment can be applied to a liquid pump or a blower which is one of generalized gas pumps. Further, the sealed motor of this embodiment can be arbitrarily combined with the above various embodiments obtained by application to a vacuum pump. Hereinafter, a more detailed embodiment of the second embodiment of the present invention will be described. In the following, a vacuum pump will be described as an example. However, the embodiment described below is not limited to a vacuum pump as described above.

2-A. Example 2-A:

In the embodiment 2-A, the overall configuration of the vacuum pump 1-20 is the same as that of the above-described embodiment 1-A. Therefore, in the following, the differences from Embodiment 1-A will be mainly described. Fig. 7 shows a schematic configuration of a motor 2-100 that rotationally drives the rotor 2-30. In the following description, regarding the motor 100, it will be in the direction of the rotation center axis AR. The side connected to the vacuum pump 20 (more specifically, the rotor 30) is also referred to as a connecting side S2, and the side opposite to the connecting side S2 is also referred to as an outer side S1. As shown in Fig. 7, the motor 2-100 includes a stator 2-110, a rotor 2-120, a sealed casing 2-130, and a stator holder 2-140.

The stator holder 2-140 is provided with a bracket body 2-141 and a side plate 2-142. The bracket body 2-141 has a cylindrical shape in which an internal space is formed along the rotation center axis line AR. The holder body 2-141 is provided with a protruding portion 2-146. The protruding portion 2-146 is a portion that protrudes inward from the inner surface of the holder body 2-141, and is formed in a ring shape around the end portion of the connection side S2 of the holder body 2-141 with the rotation center axis AR as a center. . The protruding length of the protruding portion 2-146 is formed to be substantially equal to the protruding length of the opening portion 2-133 protruding from the body portion 2-131 (described later in detail). The side plate 2-142 has a circular plate shape and closes the opening of the outer side S1 of the bracket body 2-141. A concave portion 2-145 is formed on an end surface of the outer side S1 of the holder main body 2-141, and an O-ring 2-153 is disposed in the concave portion 2-145. The O-ring 2-153 is compressed between the bracket body 2-141 and the side plates 2-142 in the direction of the rotation center axis AR, and seals between the inside and the outside of the stator holder 2-140. Further, the side plate 2-142 is attached to the bracket body 2-141 by a bolt (not shown). The stator holder 2-140 can be formed, for example, of iron or aluminum. The stator 2-110, the rotor 2-120, and the sealed casing 2-130 are housed in the internal space of the stator holder 2-140.

The stator 2-110 has a configuration in which a coil is mounted on the stator core 2-111. Both ends of the stator 2-110 in the direction of the rotation center axis AR, the coil portions 2-112, 2-113 are oriented toward the stator core 2-111 The party stands out. The stator core 2-111 is embedded in the inside of the bracket body 2-141 of the stator holder 2-140, and the stator 2-110 is fixed to the stator holder 2-140 in a concentric manner with the rotation center axis AR. The stator core 2-111 can be formed, for example, by laminating a bismuth steel plate. The rotor 2-120 is disposed inside the stator 2-110 in a concentric manner with the rotation center axis AR, and is directly coupled to the pump main shaft 2-34 of the rotor 2-30 of the vacuum pump 2-20.

A sealed casing 2-130 is provided between the stator 2-110 and the rotor 2-120. The sealed housing 2-130 isolates the stator 2-110 from the rotor 2-120. The sealed casing 2-130 includes a body portion 2-131, a closing portion 2-132, and an opening portion 2-133.

The body portion 2-131 has a substantially cylindrical shape and is disposed concentrically with the rotation center axis line AR. The body portion 2-131 has a first body portion 2-134 on the outer side S1 and a second body portion 2-135 on the connection side S2. The first body portion 2-134 extends so as to face the inner surface of the stator core 2-111, and forms the entire range of the stator core 2-111 in the rotation center axis line AR direction. The range in which the body portion 2-131 opposes the stator core 2-111 is also referred to as a relative range FR.

The second body portion 2-135 is formed closer to the coupling side S2 than the opposing range FR. The thickness of the second body portion 2-135 is larger than the thickness of the first body portion 2-134. Specifically, the thickness of the second body portion 2-135 on the outer diameter side is larger than that of the first body portion 2-134. In other words, in the direction orthogonal to the rotation center axis line AR, the inner surface of the second body portion 2-135 is located at the same position as the first body portion 2-134, but the second body portion 2-135 The outer portion is located outside the outer side of the first body portion 2-134. As a result, the outer diameter of the second body portion 2-135 becomes larger than the outer diameter of the first body portion 2-134. The end surface of the outer side S1 of the second body portion 2-135 is in contact with the end surface of the coupling side S2 of the stator core 2-111.

The closing portion 2-132 is an end surface of the outer side S1 of the sealed casing 2-130, and the inner space of the body portion 2-131 is closed at the end portion of the outer side S1 of the body portion 2-131. In the present embodiment, the closing portion 2-132 has a shape in which the outer diameter and the inner diameter are reduced from the connecting side S2 toward the outer side S1. The thickness of the closing portion 2-132 is larger than the thickness of the first body portion 2-134. Specifically, the thickness of the closing portion 2-132 on the inner diameter side is larger than that of the first body portion 2-134. In other words, the outer surface of the blocking portion 2-132 is located at substantially the same position as the first body portion 2-134 in the direction orthogonal to the rotation center axis line AR in the vicinity of the first body portion 2-134, but the blocking portion The inner surface of 2-132 is located closer to the inner side than the inner surface of the first body portion 2-134.

The opening portion 2-133 is an end portion that seals the connection side S2 of the outer casing 2-130, and forms an opening that seals the connection side S2 of the outer casing 2-130. In the present embodiment, the opening portion 12-33 has a flange shape whose outer diameter is formed larger than the outer diameter of the body portion 2-131. The end surface of the outer side S1 of the opening portion 2-133 is in contact with the end surface of the connecting side S2 of the protruding portion 2-146. The position of the seal housing 2-120 in the direction of the rotation center axis line AR is positioned by the abutting relationship between the abutting relationship and the second body portion 2-135 and the stator core 2-111 described above.

The sealed casing 2-130 is formed of a resin, and the body portion 2-131, the closing portion 2-132, and the opening portion 2-133 are integrally formed. In the present embodiment, the material of the sealed casing 1-130 is PPS (polyphenylene sulfide) resin.

In the sealed casing 1302-, the thickness of the closing portion 2-132 and the second body portion 2-135 is formed to have a thickness capable of withstanding the mechanical strength of the pressure fluctuation of the vacuum pump 2-20 during operation. The thickness of these members is usually set according to the pressure vessel calculation method described in JIS B8267 or the like, and is about 1.5 to 2.0 mm. In the present embodiment, the thickness of the opening portion 2-133 (thickness in the direction of the rotation center axis line AR) is substantially the same as the thickness of the second body portion 2-135. As described above, when the sealed casing 2-130 is produced by injection molding, since the resin can smoothly flow into the cavity, it is easy to manufacture.

On the other hand, the thickness of the first body portion 2-134 is formed to be smaller than the thickness of the closing portion 2-132 and the second body portion 2-135. The thickness of the first body portion 2-134 can be, for example, 0.5 mm to 1.0 mm. As described above, the thickness of the first body portion 2-134 is reduced, and the distance between the stator core 2-111 and the rotor 2-120 is reduced, so that the motor characteristics of the motor 2-100 are improved.

The outer surface 2-134a and the inner surface 2-134b of the first body portion 2-134 are formed so as to have a substantially horizontal inclination of 0.5 or less with respect to the rotation center axis line AR, and extend over the entire range FR. A resin sealed case is usually manufactured by injection molding. Further, in terms of injection molding, in order to smoothly release the mold after molding, a slight oblique angle is provided in the mold. This bevel is called the draft angle and is usually 1 to 2°. Therefore, an oblique angle is also formed in the molded article. As can be understood from the above description, the outer surface 2-134a and the inner surface 2-134b of the first body portion 2-134 are reduced in inclination due to the draft angle. The shape of the body portion 2-131 is realized by a method of manufacturing the sealed casing 2-130 to be described later.

The tilting system is preferably smaller. For example, it is preferable that the inclination is 0.3 or less, more preferably 0.2 or less, and it is preferable to set it to 0. In the present embodiment, the inclination of the outer surface 2-134a and the inner surface 2-134b is 0°. That is, the outer surface 2-134a and the inner surface 2-134b are correctly parallel to the rotation center axis AR. In the present embodiment, the outer and inner faces of the second body portion 2-135 are inclined at 0° with respect to the rotation center axis line AR.

The sealed casing 2-130 is attached such that the stator core 2-111 and the first body portion 2-134 are in contact with each other in the circumferential direction. Since the outer surface 2-134a of the first body portion 2-134 is not inclined with respect to the rotation center axis line AR, the stator core 2-111 and the first body portion 2-134 can be surely densely distributed over the entire range FR. With. In other words, the local gap generated between the stator core 2-111 and the outer surface 2-134a due to the inclination reduces the amount which is reduced by the inclination of the outer surface 2-134a with respect to the rotation center axis AR. Therefore, the isolation distance between the stator core 2-111 and the rotor 2-120 can be reduced as compared with the case where the outer surface 2-134a has an inclination with respect to the rotation center axis AR. In addition, as described above, the first body portion 2-134 is thinner than the closing portion 2-132 and the second body portion 2-135, but the stator core 2-111 and the first body portion 2-134 are surely Since the adhesion is spread over the entire range FR, the mechanical strength of the first body portion 2-134 can be reinforced by the stator core 2-111.

Further, since the inner surface 2-134b of the first body portion 2-134 is not inclined with respect to the rotation center axis line AR, the separation distance of the inner surface 2-134b from the rotor 2-120 is any position in the direction of the rotation center axis AR. Become fixed. The inner surface 2-134b and the rotor 2-120 must ensure a predetermined distance in order to avoid mutual interference, so that the inner surface 2-134b has an inclination with respect to the rotation center axis AR, and in order to avoid interference, the locality is minimized. The necessary separation distance for the limit. On the other hand, according to the case where the first body portion 2-134 has an inclination with respect to the rotation center axis line AR, the separation distance between the stator core 2-111 and the rotor 2-120 can be reduced by an amount which is reduced by the inclination.

Further, in the present embodiment, the stator core 2-111 and the first body portion 2-134 are joined to the abutting portion of the members by a bonding agent. In this manner, the stator core 2-111 and the first body portion 2-134 are joined by the bonding agent, whereby the stator core 2-111 and the first body portion 2-134 are integrally formed. Therefore, the stator core 2-111 can further reinforce the mechanical strength of the first body portion 2-134. Further, in consideration of heat resistance during the operation of the vacuum pump 2-20, a heat-resistant bonding agent such as a lanthanum-based or epoxy-based adhesive can also be used as the bonding agent.

The above-described sealed casing 2-130 can be manufactured in the following manner. First, a molded article PM having a portion corresponding to the body portion 2-131, the closing portion 2-132, and the opening portion 2-133 is produced by injection molding. Then, the outer surface side surface and the inner diameter side surface of the molded product PM are processed, whereby the thickness of the molded product PM in the processed portion is reduced to manufacture the sealed outer casing 2-130. According to the manufacturing sequence, it is not limited by the injection molding. The shape is limited, and the degree of freedom in sealing the shape of the outer casing can be increased. Hereinafter, the processing of the molded article PM will be described in detail.

Fig. 8 is a view showing a method of manufacturing a sealed casing, and more specifically, a method of processing a molded article PM. In Fig. 8, only the cross section of the molded article PM is shown. The upper surface 2-211 and the lower surface 2-221 are formed in a portion corresponding to the first body portion 2-134 of the molded article PM. The upper surface 2-211 and the lower surface 2-221 have inclinations from the rotation center axis AR1 to about 2° due to the draft angle.

In the present embodiment, both the upper 2-211 side and the lower 2-221 side of the molded product PM are processed. Specifically, the outer surface 2-134a parallel to the rotation center axis line AR is formed by cutting the upper surface portion 2-210 on the upper surface 2-211 side of the molded product PM. In the present embodiment, the cutting portion is a portion on the outer side S1, that is, a portion corresponding to the first body portion 2-134 and the closing portion 2-132. However, the cutting portion may include a portion corresponding to the first body portion 2-134, and cutting of other portions may be omitted.

Similarly, the inner surface 2-134b parallel to the rotation center axis line AR is formed by cutting the lower surface portion 2-220 on the lower surface 2-221 side of the molded product PM. In the present embodiment, the cutting portion is a portion that connects the side S2, that is, a portion corresponding to the first body portion 2-134, the second body portion 2-135, and the closing portion 2-133. However, the cutting portion may include a portion corresponding to the first body portion 2-134, and cutting of other portions may be omitted.

In this embodiment, the cutting process is performed by turning Work. However, the processing method of the molded article PM is not limited to a specific method, and may be any method that can reduce the thickness of the portion required for the molded article PM to form a desired shape. For example, the processing technique can be a grinding process, a polishing process, an etching, or a combination thereof.

According to these manufacturing methods, the above-described sealed casing 2-130 can be favorably manufactured. In addition, on the upper surface 2-211 side of the molded product PM, only the outer side S1 is processed, and on the lower side 2-221 side, only the joint side S2 is processed. Therefore, it is formed to have a thickness larger than the required amount as a whole. The case where the molded article PM is processed by the PM is not wasteful and efficient in processing.

2-B. Variations:

2-B-1. Variation 2-B-1:

It is also possible that only one of the outer surface 2-134a and the inner surface 2-134b of the first body portion 2-134 of the sealed casing 2-130 has an inclination of 0.7 or less with respect to the rotation center axis line AR. At this time, it is also possible to process only one of the upper surface 2-211 side and the lower surface 2-221 side of the molded article PM. Even so, a certain degree of the above effects can be achieved as compared with the conventional configuration.

2-B-2. Variation 2-B-2:

It is also possible that only a portion of the relative range FR of the first body portion 2-134 has an inclination of 0.5° or less with respect to the rotation center axis line AR. Even so, a certain degree of the above effects can be achieved as compared with the conventional configuration.

2-B-3. Variation 2-B-3:

The opposing range FR does not necessarily have to be thinned, and may have a thickness similar to that of the closing portion 2-132 or the second body portion 2-135. At this time, in order to reduce the inclination of the outer surface 2-134a and the inner surface 2-134b of the first body portion 2-134 with respect to the rotation center axis line AR, it is possible to perform the minimum necessary processing for the molded article PM.

2-B-4. Variation 2-B-4:

The sealed casing 2-130 does not necessarily have to have a shape closed on the outer side S1. For example, the first body portion 2-134 may be formed to extend toward the outer side S1, and the airtightness may be in contact with the side plate 2-142. At this time, the thickness of the first body portion 2-134 of the outer side S1 can be made larger than the thickness of the opposing range FR as seen from the relative range FR.

3. The third embodiment group:

According to an embodiment of the present invention, there is provided a sealed motor for rotationally driving a vacuum pump which is separated from a rotor and a rotor by a cylindrical resin partition wall covering an inner peripheral portion of the stator, the sealed motor being a peripheral portion of the partition wall An engaging portion that meshes with the magnetic pole tooth portion of the stator in the radial direction is formed. According to this configuration, the outer peripheral portion of the partition wall of the partition wall is formed with an engaging portion that meshes with the magnetic pole tooth portion of the stator in the radial direction. Therefore, it is possible to locally support the compressive force acting on the inner side in the radial direction of the partition wall during the operation of the vacuum pump on the stator side. Therefore, the thickness of the partition wall can be remarkably reduced as compared with the conventional configuration, whereby the gap between the stator and the rotor can improve the efficiency of the motor.

In an embodiment of the present invention, the meshing portion has a cross-sectional shape complementary to the magnetic pole tooth portion so as to be in close contact with the magnetic pole tooth portion. The engaging portion can also be formed with a rib extending along the longitudinal direction of the partition wall. According to this embodiment, the engaging portion has a cross-sectional shape complementary to the magnetic tooth portion so as to be in close contact with the magnetic tooth portion, and the engaging portion is formed with a rib extending along the longitudinal direction of the partition wall. Therefore, the cylindrical partition wall can be easily inserted into the stator so that the meshing portion is fitted to the magnetic pole tooth portion, and the partition wall can be adhered to the stator. Thereby, the gap between the stator and the rotor can be remarkably reduced to improve the efficiency of the motor.

In one embodiment of the present invention, the stator may include a slot formed between the magnetic pole tooth portions, and the meshing portion may extend outward in the radial direction so that the winding can be held in the groove. According to this embodiment, since the meshing portion extends outward in the radial direction so that the winding can be held in the groove, the wire holding member inserted into the groove as a separate member can be omitted (in other words, the interval The use of a spacer. Therefore, the number of components of the motor and the number of assembly steps can be greatly reduced, and the manufacturing cost of the motor can be greatly reduced.

In an embodiment of the present invention, the engaging portion may include a recess that opens outward in the radial direction in the groove. According to this aspect, the meshing portion includes a recess that opens toward the outside in the radial direction. Therefore, not only can the meshing portion maintain the meshing direction with the magnetic pole tooth portion, but also the space in the groove can be utilized to the utmost extent as compared with the conventional rectangular rectangular wire holding member (in other words, the spacer). Therefore, for example, the number of turns that can be accommodated in the tank can be increased, whereby the motor efficiency can be remarkably improved.

According to an embodiment of the present invention, a vacuum pump including the sealed motor of any of the above aspects is provided.

According to an embodiment of the present invention, it is possible to provide a sealed motor including a sealed outer casing member which does not need to be increased even when the rotor casing is used under a reduced pressure environment and the sealed outer casing member is subjected to a large compressive force during operation. The wall of the large sealed outer casing member is thick and does not deform with respect to the compressive force.

Further, according to an embodiment of the present invention, it is possible to provide a sealed motor in which the magnetic efficiency between the stator and the rotor is minimized to significantly improve the efficiency of the motor.

Further, according to an embodiment of the present invention, it is possible to provide a sealed motor capable of greatly reducing the number of components and assembly time.

Further, according to an embodiment of the present invention, it is possible to provide a sealed motor in which the space in the slot of the stator is utilized to the utmost and the motor efficiency is remarkably improved.

Furthermore, according to an embodiment of the present invention, a vacuum pump including the sealed motor described above can be provided. The above various embodiments can be arbitrarily combined. Hereinafter, a more detailed embodiment of the embodiment of the present invention will be described.

3-A. Example 3-A:

Fig. 9 is a perspective view showing the details of the configuration of the partition walls 3-18-1. The partition 3-18-1 is configured to correspond to the sealed casing 1-130 of the above-described Embodiment 1-A. The partition wall 3-18-2 (see Fig. 11) has the same configuration as the partition wall 3-18-1, so that only the partition wall 3-18-1 is shown in Fig. 9. As shown in Figure 9, the partition 3-18-1 has a real The cylindrical body portion 3-181 is formed in a cylindrical shape, and one end portion 3-182 of the body portion 3-181 in the longitudinal direction is closed, and the other end portion 3-183 is open. An annular flange portion 3-184 is formed on the periphery of the open end 3-183, and the annular flange portion 3-184 is passed through a pump casing (pump casing) such as a bolt (not shown). 1-40) The side is fixed in a sealed state. The outer peripheral surface of the body portion 3-181 is provided with a rib extending in the longitudinal direction of the partition wall 3-18-1, and the rib is formed by an engaging portion to be described later.

Further, in the example shown in Fig. 9, the partition wall 3-18-1 is integrally formed so as to be closed at the end portion 3-182 on the opposite side to the annular flange portion 3-184 in the longitudinal direction thereof. Cylindrical. However, the partition wall 3-18-1 may have a shape in which an end portion on the opposite side to the annular flange portion 3-184 has an opening. Fig. 10 shows an example of a partition wall 3-18-1' having such an open end 3-182'. At this time, the other blocking member is fixed to the open end 3-182' in a sealed state.

Fig. 11 is a cross-sectional view showing the radial direction of the motor portion M (corresponding to the motor 1-100 of Fig. 1). In the figure, a cross section perpendicular to the motor M is shown, and a cooling pipe and a mounting portion of the motor (not shown) in other embodiments are also shown. The motor M is configured such that the permanent magnets 3-19 are circumferentially disposed on the shafts 3-16'-1, 3-16'-2 of the respective motor rotors directly coupled to the main shaft of the pump P, and the stator 3 is disposed on the outer periphery thereof. 11 and the partition walls 3-18-1, 3-18-2 are interposed therebetween. The stator 3-11 includes: a stator core 3-22; a plurality of magnetic pole tooth portions 3-20 extending inward in the radial direction of the stator core 3-22; and a groove formed between the magnetic pole tooth portions 3-20 The side of the magnetic pole tooth 3-20 that is wound within 3-30 Winding 3-21 of the configuration. In order to increase the surface area facing the permanent magnets 3-19, the front end portions of the respective magnetic pole tooth portions 3-20 extend substantially parallel (in other words, the circumferential direction) with respect to the permanent magnets 3-19, and an extension portion is formed (in other words, , expansion department) 3-20-2. The extension portion 3-20-2 has a larger cross-sectional area than the magnetic pole base portion 3-20-1 extending substantially linearly from the stator core 3-22 (see Fig. 12).

The magnetic pole tooth portion 3-20 is in a position where the central axis C between the two motor rotors 3-16-1, 3-16-2 is in a symmetrical position and the opposite magnetic pole is formed when the winding 3-21 is energized, A DC brushless motor that is synchronized to form an inversion. Further, in the present embodiment, the motor M is a two-axis type brushless DC motor, but in another embodiment, a one-axis type brushless DC motor can also be used. Further, the motor to which the present embodiment is applied is not particularly limited as long as it belongs to the motor.

In addition, although the present embodiment is applied to a vacuum pump in a good manner, the term "vacuum pump" as used in the present specification refers to a pump used in a state in which the pump casing is decompressed with respect to the vicinity of the pump during operation. That is, the term "vacuum" refers to a relative vacuum, and does not refer only to absolute vacuum. In addition, the present embodiment can also be applied to pumps other than vacuum pumps.

Next, the form of the partition 3-18-1 will be described in detail with reference to FIGS. 12 and 13. Fig. 12 is a partially enlarged view of Fig. 11, and the windings 3-21 are omitted from illustration. Fig. 13 is a view showing a partition wall 3-18-1 alone, and is a partial cross-sectional view in the longitudinal direction of the body portion 3-181 which is cut across the partition wall 3-18-1.

Referring to Figure 12, as described above, each of the stators 3-11 The distal end portion of the magnetic pole tooth portion 3-20 is substantially parallel to the permanent magnet 3-19 (in other words, the circumferential direction) so as to increase the surface area relative to the permanent magnet 3-19, thereby forming a ratio. The extension portion 3-20-2 of the large cross-sectional area of the magnetic pole base 3-20-1. A groove 3-30 for accommodating the winding 3-21 (not shown) is formed between the magnetic pole tooth portions 3-20. On the other hand, the outer peripheral portion of the partition wall 3-18-1 is formed such that the meshing portions that mesh with the magnetic pole tooth portions 3-20 in the radial direction are formed in the respective grooves 3-30. Specifically, the body portion 3-181 of the partition wall 3-18-1 is formed with a projection portion 3-185 that protrudes outward in the radial direction of the partition wall 3-18-1 in correspondence with the groove 3-30. As shown in Fig. 12, each of the projections 3-185 is formed such that the outer peripheral portion of the partition wall 3-18-1 is fitted to the front end portion of the magnetic pole tooth portion 3-20 (in other words, the partition wall 3-18-1) The outer peripheral portion is closely adhered to the front end portion of the magnetic pole tooth portion 3-20), and has a cross-sectional shape complementary to the distal end portion of the magnetic pole tooth portion 3-20. Specifically, as shown in the cross-sectional view of Fig. 13, the projections 3-185 are provided with a base portion 3-185-1 having a width (in other words, a circumferential dimension) that protrudes in the radial direction from the body portion 3-181, and An extension portion (in other words, an expansion portion) 3-185-2 having a large width extending from the distal end of the base portion 3-185-1 toward the circumferential direction of the body portion 3-181. The extension portion 3-185-2 has a diameter direction and an extension portion 3-20-2 in the groove 3-30 so as to mesh with the extension portion 3-20-2 of the magnetic pole tooth portion 3-20 in the radial direction. A mating surface 3-185-3 disposed opposite to each other; and a flat front end surface 3-185-4 disposed in a direction opposing the stator core 3-22. A groove in which the tip end portion of the magnetic pole tooth portion 3-20 can be fitted is formed by the outer surface of each of the protruding portion 3-185 and the body portion 3-181 located between each of the protruding portions 3-185. 3-186. As described above, in the present embodiment, the engaging portions are formed by the respective projections 3-185 of the partition walls 3-18-1 and the outer surfaces of the body portions 3-181 located between the respective projections 3-185.

When the pump P is rotationally driven by the sealed motor M having the above configuration, a vacuum region is formed in the pump casing 3-3 and the rotor chambers 3-17-1, 3-17-2, and the rotor chamber 3-17- 1. The partition walls 3-18-1 and 3-18-2 of 3-17-2 act as a radial direction as shown in Fig. 12 due to the differential pressure between the atmospheric pressure around the motor M and the pressure in the vacuum region. The compressive force F (in other words, a large pulling force acting inside the rotor chambers 3-17-1, 3-17-2). However, in the present embodiment, the outer peripheral portion of the partition walls 3-18-1 and 3-18-2 is formed with the engaging surface 3-185 having the magnetic pole tooth portion 3-20 of the stator 3-11 in the radial direction. With the meshing portion of -3, a part of the compressive force in the radial direction generated when the pump is operated can be supported by the stator 3-11. That is, in the above embodiment, a part of the compressive force is supported by the stator 3-11 through the engaging surface 3-185-3, so that it is not necessary to partition the wall 3-18-1, 3- as in the conventional manner. 18-2 supports all compression forces. Therefore, even if the partition walls 3-18-1, 3-18-2 are formed to be thinner than conventionally, the partition walls 3-18-1, 3-18-2 are not bent inward due to the compressive force. After that. Therefore, it is possible to significantly reduce the thickness of the partition walls 3-18-1 and 3-18-2 located in the magnetic gap, thereby making it possible to minimize the magnetic gap and improve the motor characteristics.

Further, as described in the above embodiment, the cross-sectional shape of the meshing surface 3-185-3 including the meshing portion is preferably relative to the magnetic pole tooth portion. The front end portions of 3-20 have complementary cross-sectional shapes, and as shown in FIGS. 9 and 10, the meshing portions preferably extend integrally toward the longitudinal direction of the partition walls 3-18-1 and 3-18-2. Forming ribs. Therefore, when the motor M is assembled, the partition wall 3-18-1 can be formed such that the outer peripheral portions of the partition walls 3-18-1 and 3-18-2 are fitted to the distal end portions of the magnetic pole tooth portions 3-20. 3-18-2 is easily inserted into the stator 3-11 along the rib, and the partition walls 3-18-1, 3-18-2 are easily adhered to the stator 3-11. Therefore, the gap between the stator and the rotor can be minimized. This embodiment can also be advantageously applied to a pump other than a vacuum pump. Further, in another embodiment, the rib portion in which the meshing portion is formed can extend continuously over the entire length of the partition wall 3-18-1 (3-18-2) as shown in Figs. 9 and 10 . . Alternatively, the ribs can also extend intermittently throughout the plurality of sections. Further, it is also possible to extend over a part of the entire length of the partition wall 3-18-1 (3-18-2).

Further, in the present embodiment, the meshing portion is formed to have a predetermined radial dimension, whereby the meshing portion can function as a winding holding portion for holding the winding in the groove 3-30. Conventionally, in order to hold the winding in the groove of the stator, another winding holding member called a "spacer" is used. The wire holding member is generally a member that processes a resin material as a non-metallic material into a rectangular shape, and is inserted into each groove to hold the wire in the groove without loosening. The winding is fixed by filling the groove with resin after the completion of the motor, and it is necessary that the spacer is wound between the steps until the resin is filled. In another embodiment, for example, the extension portion 3-185-2 of the protruding portion 3-185 of the above embodiment can also be used. The predetermined thickness is provided, and the extension portion 3-185-2 functions as a winding holding portion instead of the conventional spacer. The extension portion 3-185-2 is a portion disposed in the groove 3-30, and is not a portion located in the magnetic gap. Therefore, even if the thickness of the extension portion 3-185-2 is increased, there is no motor efficiency. influences. According to this configuration, it is not necessary to use another winding holding member, and therefore, the number of parts and the number of assembling steps of the sealed motor can be greatly reduced.

Further, in the above-described embodiment, the projections 3-185 are formed in a substantially T-shaped cross section, but the cross-sectional shape of the front end portion of the magnetic pole tooth portion 3-20 of the present embodiment is formed into a substantially inverted T shape to constitute the meshing. The cross-sectional shape of the protrusion portion of the portion can be changed in accordance with the cross-sectional shape of the front end portion of the corresponding magnetic pole tooth portion 3-20. An example of the projections 3-185' having other cross-sectional shapes is shown in Fig. 14. In this example, the front end portion of the magnetic pole tooth portion 3-20 is formed as an extended portion 3-20-2' having a substantially triangular cross-sectional shape. Therefore, the protrusion 3-185' includes an inverted triangular portion having a mating surface 3-185'-3 that meshes with a substantially triangular bevel of the extension 3-20-2'; and the stator The cores 3-22 are arranged in a flat front end face 3-185'-4. Similarly to the embodiment shown in Figs. 12 and 13, the part of the force acting in the compression direction of the partition walls 3-18-1 and 3-18-2 can be supported by the meshing surface 3-185'-3. In the stator 11. Further, the protruding portion 3-185' includes a winding holding portion 3-187 extending outward in the radial direction so that the winding (not shown) can be held in the groove 3-30.

Figures 15 to 17 show the cross-sectional shape of the meshing portion Another example. In the above embodiment, the distal end faces 3-185-4 and 3-185-4' of the protruding portions 3-185 and 3-185' are formed as flat faces, but in the examples of Figs. 15 to 17 The meshing portion has a recess (in other words, a groove) that opens to the outside in the radial direction in the groove 3-30. Fig. 15 is a view showing an example in which the projections 3-285 formed by the rectangular grooves 3-288 having a rectangular cross section are formed on the distal end surface of the projection of the substantially T-shaped cross section shown in Fig. 13. Specifically, a rectangular groove 3-288 having a rectangular cross section is formed at a substantially central portion in the width direction of the front end surface 3-285-4 of the protrusion portion 3-285. Similarly to the above-described embodiment, the extension portion 3-285-2 extending in the width direction from the distal end of the base portion 3-285-1 of the projection portion 3-285 is provided in the groove 3-30 and the magnetic pole tooth portion 3-20. The extension portion 3-20-2 is disposed opposite to the engagement surface 3-285-3, and the engagement surface 3-285-3 is engaged with the extension portion 3-20-2 in the radial direction, whereby the force in the compression direction can be made A part of it is supported on the stator 3-11. Further, in the example of Fig. 15, since the rectangular groove 3-288 is formed in the front end surface 3-285-4, even if the extension portion 3-285-2 is disposed in the groove 3-30, it is possible to Since the space in the grooves 3-30 is used as the winding holding space to the limit, the efficiency of the motor can be improved.

Fig. 16 is a view showing an example in which a projection 3-385 having a triangular groove (in other words, a V groove) 3-388 having an inverted triangular cross section is formed on the front end surface of the projection of the substantially inverted triangular cross section shown in Fig. 14. FIG. 17 is a view showing an example in which a projection portion 3-485 having a circular arc groove 3-488 having an arc-shaped cross section is formed on the front end surface of the projection portion of the substantially inverted T-shaped cross section shown in FIG. Figure. In Figures 16 and 17 In the example shown in the figure, as in the example shown in Fig. 15, the grooves 3-388 and 3-488 are formed on the distal end faces of the projections 3-385 and 3-485, whereby the engagement surface 3-385 can be maintained. -3, 3-485-3 is meshed with the magnetic pole tooth portion 3-20 in the radial direction, and the space in the groove 3-30 can be utilized as the winding holding space to the maximum extent, so that the motor efficiency can be improved. Further, in the examples of FIGS. 16 and 17, the recessed portions 3-388 and 3-384 are formed in the entire width direction of the distal end faces of the projections 3-385 and 3-485, but they can also be combined with those of Fig. 15. The example is similarly formed only on a part of the front end face.

This embodiment can be widely applied to a sealed motor used in a pump, and can be suitably used in a vacuum pump in which a rotor chamber is used in a reduced pressure environment.

4. The fourth embodiment group

An embodiment of the present invention provides a sealed motor that is coupled to a vacuum pump and used as a rotary drive source of a vacuum pump. The sealed motor includes: a stator core; a rotor disposed inside the stator core; and a sealed outer casing disposed between the stator core and the rotor, and isolating the stator core and the rotor, the sealed casing having a hollow shape The body portion extends in the direction of the rotation center axis of the rotor, and the opening portion forms an opening of the body portion on the first side of the side directly connected to the vacuum pump among the directions of the rotation center axis. The stator core and the rotor are hermetically sealed by a sealed outer casing and an O-ring disposed along the circumferential direction on the outer surface of the opening of the sealed outer casing.

According to the sealed motor, since the O-ring is provided on the outer side in the circumferential direction of the sealed casing, the second O-ring is provided in the sealed casing. In the case of the end surface on the side, the telescopic expansion can be made short to reach the installation space of the O-ring. Usually, the vacuum pump is disposed and assembled such that the direction of the rotation center axis is horizontal (the direction orthogonal to the vertical direction). In the case of this configuration, according to the first aspect, since the O-ring is mounted on the surface in the horizontal direction, the O-ring is mounted in the vertical direction of the end surface formed on the second side of the sealed casing. In the case of the surface, the O-ring is not easily detached in the middle of the assembly of the vacuum pump. Therefore, the assembly of the vacuum pump is easy.

In an embodiment of the invention, the sealed outer casing can also be formed of a resin. The opening portion may be formed in a flange shape, and the thickness of the flange shape in the direction orthogonal to the rotation center axis may be larger than the thickness of the body portion. According to this embodiment, even when the thickness of the body portion is made as small as possible in order to improve the motor characteristics, and the distance between the rotor and the stator is reduced, the opening portion can be sufficiently rigid. Therefore, the O-ring can be well compressed and deformed, and good sealing performance can be obtained.

In an embodiment of the invention, the sealed outer casing can also be formed of a resin. The opening portion may have a first portion formed on the outer side of the sealed casing from the body portion in a direction intersecting the rotation center axis direction, a second portion formed from the first portion toward the first side, and the second portion. The rib between the 1 part and the 2nd part. The thickness of the first portion and the second portion may be one or more and two or less times the thickness of the body portion. According to this embodiment, even when the thickness of the body portion is made as small as possible and the distance between the rotor and the stator is reduced, the opening can be reinforced by the rib to obtain sufficient rigidity. Therefore, the O-ring can be satisfactorily compressed and deformed to obtain a reliable sealing performance. Moreover, the thickness of the sealed casing Since any part is housed in a predetermined range, a resin sealed case can be manufactured by injection molding. Further, in terms of injection molding, the molded article is left in the inner mold at the time of demolding after molding. According to the third embodiment, the rib portion is formed in the sealed casing, whereby the molded article is easily caught in the inner mold (male mold), and as a result, it is easy to produce a sealed casing made of resin by injection molding.

According to an embodiment of the present invention, a segment portion in which the second side protrudes outward may be formed on the outer surface of the body portion along the circumferential direction. The sealed casing can also be mounted in a state in which the segment portion abuts against the stator core. According to this embodiment, when the sealed motor is assembled, the positioning in the direction of the rotation center axis can be performed by the segment portion. Therefore, a portion protruding toward the inner diameter side is formed with a part of the inner surface of the hollow stator bracket in which the stator core is inserted, and the end portion of the second side of the sealed casing is formed in a flange shape, and the protrusion is formed. Compared with the case where the flange-shaped end portion of the sealed casing abuts on the flange-shaped end portion and is positioned in the rotation center axis direction, the present embodiment can shorten the amount by which the overhang reaches the protruding portion.

According to an embodiment of the present invention, the sealed casing can have a closed portion that closes the internal space of the body portion on the second side opposite to the first side. According to this embodiment, the inside of the sealed casing can be easily sealed, and the stator core and the rotor can be hermetically insulated.

An embodiment of the present invention provides a vacuum pump. The vacuum pump can also be provided with any one of the above-described sealed motors. The above various embodiments can be arbitrarily combined.

Furthermore, an embodiment of the present invention provides a connection A sealed motor that is attached to a pump and used as a rotary drive source for the pump. The sealed motor includes: a stator core; a rotor disposed inside the stator core; and a sealed outer casing disposed between the stator core and the rotor, and isolating the stator core and the rotor, the sealed casing having a hollow shape The body portion extends in the direction of the rotation center axis of the rotor, and the opening portion forms an opening of the body portion on the first side of the side directly connected to the pump in the direction of the rotation center axis. The stator core and the rotor are hermetically sealed by a sealed outer casing and an O-ring disposed along the circumferential direction on the outer surface of the opening of the sealed outer casing. The sealed motor of this embodiment can be applied to various pumps. For example, the sealed motor of this embodiment can be applied to a liquid pump or a blower which is one of generalized gas pumps. Further, the sealed motor of the present embodiment can be arbitrarily combined with the above various embodiments obtained by applying to a vacuum pump. Hereinafter, a fourth embodiment of the present invention will be exemplified and described in more detail. In the following, a vacuum pump will be described as an example. However, the embodiment described below is as described above, and is not limited to the vacuum pump.

4-A. Example 4-A:

In the embodiment 2-A, the overall configuration of the vacuum pump 1-20 is the same as that of the above-described embodiment 1-A. Therefore, in the following, the differences from Embodiment 1-A will be mainly described. Fig. 18 is a view showing a schematic configuration of a motor 4-100 that rotationally drives the rotor 4-30. In the following description, regarding the motor 4-100, the side connected to the vacuum pump 4-20 (more specifically, the rotor 4-30) among the rotation center axis AR directions is also referred to as a joint side S1. The opposite side of the joint side S1 is also referred to as the outer side S2. As shown in Fig. 18, the 4-motor 100 includes a stator 4-110 and a rotor 4-120, and a sealed casing 4-130 and a stator bracket 4-140.

The stator bracket 4-140 is provided with a bracket body 4-141 and a side plate 4-142. The holder body 4-141 has a cylindrical shape in which an internal space is formed along the rotation center axis line AR. The side plate 4-142 has a circular plate shape and closes the opening of the outer side S2 of the bracket body 4-141. The stator 4-110, the rotor 4-120, and the sealed casing 4-130 are housed in the internal space of the stator holder 4-140.

The stator 4-110 has a configuration in which a coil 4-112 is mounted on the stator core 4-111. The stator 4-110 is fixed to the stator holder 4-140 in a concentric manner with the rotation center axis AR by embedding the stator core 4-111 inside the holder body 4-141 of the stator holder 4-140. The rotor 4-120 is disposed inside the stator 4-110 concentrically with the rotation center axis AR, and is directly coupled to the pump main shaft 4-34 of the rotor 4-30 of the vacuum pump 4-20.

A sealed casing 4-130 is provided between the stator 4-110 and the rotor 4-120. The sealed housing 4-130 isolates the stator 4-110 from the rotor 4-120. The sealed casing 4-130 includes a body portion 4-131, a closing portion 4-132, and an opening portion 4-133. The body portion 4-131 has a substantially cylindrical shape and is disposed concentrically with the rotation center axis AR. The body portion 4-131 extends to form an entirety of the installation range of the stator 4-110 in the direction of the rotation center axis line AR. Further, the segment portion 4-134 that protrudes outward from the connection side S1 extends in the circumferential direction and is formed outside the body portion 4-131. In the present embodiment, the segments 4-134 are continuously formed in a ring shape. That is, the thickness of the body portion 4-131 is defined by the segment portion 4-134, and the connection side S1 is larger than the outer side side S2. However, the segment portion 4-134 can also be a pattern in which the protruding portion is scattered along the circumferential direction.

The closing portion 4-132 is an end surface of the outer side S2 of the sealed casing 4-130, and the inner space of the body portion 4-131 is closed at the end portion of the outer side S2 of the body portion 4-131. The opening portion 4-133 is an end portion that seals the connection side S1 of the outer casing 4-130, and forms an opening that seals the connection side S1 of the outer casing 4-130. In the present embodiment, the opening portion 4-133 has a flange shape whose outer diameter is formed larger than the outer diameter of the body portion 4-131. Therefore, the thickness of the opening portion 4-133 in the direction orthogonal to the rotation center axis line AR is thicker than the body portion 4-131 of the connection side S1 as viewed from the segment portion 4-134, and is more connected from the segment portion 4-134. The body portion 4-131 of the side S2 is thick and thicker than the occlusion portion 4-132

In the present embodiment, the sealed casing 4-130 is formed of a resin, and the body portion 4-131, the closing portion 4-132, and the opening portion 4-133 are integrally formed. The thickness of the body portion 4-131 can be, for example, 1.5 mm to 2.0 mm. The thickness of the body portion 4-131 can also be made thin, for example, from 0.5 mm to 1.0 mm. The sealed casing 4-130 is attached such that a portion of the stator core 4111 and the body portion 4-131 that is closer to the outer side S2 than the segment portion 4-134 is circumferentially abutted. At this time, the end surface of the segment portion 4-134 is in a state of coming into contact with the stator core 4-111. That is, the segment portion 4-134 has a function as a positioning means for the direction of the rotation center axis AR of the sealed casing 4-130.

The motor 4-100 is a bracket for the stator bracket 4-140 The main body 4-141 is fixed to the bearing members 4-50 by bolts (not shown), thereby being attached to the vacuum pumps 4-20. In addition, in Fig. 18, the cross section to which the bolt is attached is not shown. At this time, the end surface of the connection side S1 of the opening portion 4-133 of the sealed casing 4-130 is in contact with the end surface of the outer side S2 of the bearing member 4-50. Further, the stator 4-110 and the rotor 4-120 are hermetically sealed by the O-ring 4-151 disposed along the circumferential direction on the outer surface of the opening portion 4-133 of the sealed casing 4-130. Specifically, a recessed portion 4-143 is formed on the inner surface of the bracket main body 4-141 of the stator holder 4-140 along the circumferential direction, and an O-ring 4-151 is disposed in the recessed portion 4-143. The O-ring 4-151 is compressed between the opening portion 4-133 and the bracket body 4-141 in a direction intersecting with the rotation center axis AR (here orthogonal), and seals the stator 4-110 and the rotor 4 Between -120.

Further, a concave portion 4-144 is formed on an end surface of the joint side S1 of the bracket main body 4-141, and an O-ring 4-152 is disposed in the concave portion 4-144. The O-ring 4-152 is compressed between the bracket body 4-141 and the bearing member 4-50 in the direction of the rotation center axis AR, and seals between the rotor 4-120 and the motor 4-100.

Fig. 19 is a view showing a schematic configuration of a motor 4-100a as a comparative example. In each of the components of the motor 4-100a, the end of the symbol is added to each component of the motor 4-100 of the embodiment, and the symbol "a" corresponding thereto is added. Hereinafter, the difference between the motor 4-100a and the motor 4-100 will be described.

The stator holder 4-140a is provided with a protruding portion 4-146a. The protruding portion 4-146a is a portion that protrudes inward from the inner surface of the holder body 4-141a, and is formed in the vicinity of the end portion of the connection side S1 of the holder body 4-141a. The protruding length of the protruding portion 4-146a is formed to be substantially equal to the opening portion 4-133a. The width of the protruding portion 4-146a in the direction of the central axis of rotation AR is also referred to as the width W1. The body portion 4-131a of the sealed casing 4-130a has substantially the same thickness at any position in the direction of the rotation center axis line AR. That is, the segment portion 4-134 of the motor 4-100 is not formed in the body portion 4-131a. Therefore, the sealed casing 4-130a is positioned in the direction of the rotation center axis line AR by the end surface of the connection side S1 of the protruding portion 4-146a contacting the end surface of the outer side S2 of the opening portion 4-133a.

An annular recessed portion 4-52a is formed in the circumferential direction on the end surface of the outer side S2 of the bearing member 4-50a. The width of the concave portion 4-52a in the direction of the central axis of rotation AR is also referred to as the width W2. An O-ring 4-151a is disposed in the recess 4-52a. The O-ring 4-151a is compressed between the opening 4-133a and the recess 4-52a in the direction of the rotation center axis line AR, and between the stator 4-10a and the rotor 4-120a, and the rotor 4-120a and the motor. Seal the outside of 4-100a. The motor 4-100a is mounted against the bearing member 4-50a in the direction of the rotation center axis AR, and therefore, as shown in Fig. 19, the O-ring 4-151a is directed toward the direction of rotation (i.e., toward the center of rotation). The axis AR direction is configured in a manner of compression deformation.

As can be understood from the above description, the protruding portion 4-146a is provided for positioning the rotation center axis line AR of the sealed casing 4-130. Further, when the opening portion 4-133a is formed to be thin, the protruding portion 4-146a also functions to assist the rigidity of the opening portion 4-133a. That is, for The O-ring 4-151a is compressed in the direction of the rotation center axis line AR, and the protruding portion 4-146a imparts the necessary rigidity to the opening portion 4-133a.

According to the vacuum pump 4-20 described above, the O-ring 4-151 that seals between the rotor 4-120 and the stator holder 4-140 is attached to the outside of the sealed casing 4-130 (opening 4-133). Direction setting. Therefore, compared with the case where the O-ring 4-151a is disposed on the end face of the joint side S1 of the sealed casing 4-130 (opening portion 4-133a) as the motor 4-100a, the vacuum pump 4-20 can shorten the telescopic expansion to O. The amount of space in which the ring 4-151 is disposed (i.e., the amount reaching the width W2).

Further, the vacuum pump 4-20 can position the rotation center axis AR direction by the segment portion 4-134 at the time of assembly of the motor 4-100. Therefore, a projection 4-146a is formed on the inner surface side of the stator holder 4-140a like the motor 4-100a, and the opening portion 4-133a of the seal housing 4-130a is formed in a flange shape, and the projection 4-146a The vacuum pump 4-20 can shorten the telescopic expansion to the amount of the protruding portion 4-146a (that is, the amount of the width W1) as compared with the case where the opening portion 4-133a is brought into contact with the opening in the direction of the rotation center axis line AR.

Further, in a state where the vacuum pump 4-20 is disposed horizontally, that is, in a state in which the rotation center axis AR extends in the horizontal direction, the motor 4-100 is attached to the vacuum pump 4-20, the O-ring 4- The 151 series is installed in the horizontal direction. Therefore, compared with the case where the O-ring 4-151a is mounted on the surface in the vertical direction as the motor 4-100a, the vacuum pump 4-20 can suppress the O-ring 4-151 from the recess 4 in the middle of the assembly of the vacuum pump 4-20. 143 fell off. As a result, the assembly of the vacuum pump 4-20 becomes It's easy.

Further, in the vacuum pump 4-20, the sealed casing 4-130 is formed of a resin, and the thickness of the opening portion 4-133 is larger than the thickness of the body portion 4-131. Therefore, even if the body portion 4-131 is made thinner to reduce the distance between the rotor 4-120 and the stator 4-110 in order to improve the motor efficiency, the opening portion 4-133 can be sufficiently rigid, so that it can be obtained. The O-ring 4-151 is well compressed and deformed to obtain good sealing performance.

4-B. Example 4-B

Fig. 20 and Fig. 21 show the construction of a sealed casing 4-230 as a vacuum pump of the embodiment 4-B. As a vacuum pump of Example 4-B, only a part of the structure of the sealed casing was different from that of Example 4-A, and other points were common to Example 4-A. Therefore, in the following, regarding the sealed casing 4-230, only the difference from the embodiment 4-A will be described. Fig. 20 is a partial cross-sectional view showing the sealed casing 4-230 corresponding to Fig. 18. Fig. 21 is a view showing the sealed casing 4-230 from the joint side S1.

The sealed casing 4-230 includes the body portion 4-231, the closing portion 4-232, and the opening portion 4-233 in the same manner as in the embodiment 4-A. The thickness of the occlusion portion 4-232 is formed to be slightly larger than the thickness of the body portion 4-231. The closing portion 4-232 has an arc shape that is swollen toward the outer side S2. The opening portion 4-233 has a first portion 4-234 formed on the outer side of the sealed casing 4-230 from the body portion 4-231 in a direction intersecting (in this case orthogonal to) the direction of the rotation center axis line AR, And the second portion 4-235 formed from the first portion 4-234 toward the connection side S1. Part 1 4-234 and Part 2 The thickness of the position 4-235 is in the range of 100% or more and 200% or less with respect to the thickness of the body part 4-231.

As shown in Fig. 20 and Fig. 21, the rib portion 4-236 is spread between the first portion 4-234 and the second portion 4-235 in the circumferential direction. The rib portion 4-236 is an end portion on the inner side from the top surface of the connection side S1 of the second portion 4-235, and is oriented in a direction orthogonal to the rotation center axis line AR toward the rotation center axis line AR, and the first portion 4 - 234 extends to the same extent as the length in the direction orthogonal to the central axis of rotation AR, and forms an acute angle with the central axis of rotation AR, and is close to the base end of the body portion 4-231 side of the first portion 4-234. The way the ministry is formed. In the motor including the sealed casing 4-230, the O-ring 4-151 described above is disposed outside the opening portion 4-133.

According to the sealed casing 4-230, even when the thickness of the body portion 4-231 is made as small as possible, the opening portion 4-233 can be reinforced by the rib portion 4-236, and sufficient rigidity can be obtained. Therefore, the O-ring 4-151 can be satisfactorily compressed and deformed to obtain a reliable sealing performance. Further, since the thickness of the sealed casing 4-130 is accommodated in a predetermined range regardless of the position, the resin sealed casing 4-230 can be manufactured by injection molding. Further, in terms of injection molding, the molded article is left in the inner mold when the mold is released after molding. According to the sealed casing 4-230, the ribs 4-236 are formed in the sealed casing 4-230, whereby the molded article is easily caught in the inner mold, and as a result, the resin-made sealed casing 4-230 can be easily produced by injection molding.

4-C. Variations:

4-C-1. Variation 4-C-1:

The opening portion 4-133 does not necessarily have to have a flange shape. For example, the opening portion 4-133 can also be formed with the same outer diameter as the body portion 4-131. Even in this case, the O-ring 4-151 can be disposed between the opening portion 4-133 and the stator holder 4-140.

4-C-2. Variation 4-C-2:

The O-ring 4-151 does not necessarily have to be disposed between the bracket body 4-141 and the opening portion 4-133. For example, depending on the shape of the mating faces of the bearing members 4-50 and the motor 4-100, the O-rings 4-151 can also be orthogonal to the rotation center axis AR between the bearing members 4-50 and the opening portions 4-133. The direction is configured in a way that is compressed and deformed.

4-C-3. Variation 4-C-3:

The recess 4-143 for arranging the O-ring 4-151 does not necessarily have to be formed on the bracket body 4-141. For example, the concave portion can also be formed in the opening portion 4-133.

4-C-4. Variation 4-C-4:

The material of the sealed casing 4-130 is not limited to resin, and can be made of various materials. For example, the material of the sealed casing 4-130 can also be made of a non-magnetic metal such as stainless steel. Even in this case, the overhang can be shortened in the same manner as in the examples 4-A and 4-B.

4-C-5. Variation 4-C-5:

The sealed casing 4-130 does not necessarily have to have a closed shape on the outer side S2. For example, the body portion 4-131 can be further formed to extend toward the outer side S2, and is airtightly abutted to the side plate 4-142.

The embodiments of the present invention have been described above with reference to a few embodiments. However, the embodiments of the present invention are not intended to limit the scope of the present invention. The present invention can be modified and improved without departing from the spirit and scope of the invention. In addition, in the range in which at least some of the above-mentioned problems can be solved, or a range in which at least a part of the effects are achieved, combinations or omissions of the respective constituent elements described in the claims and the description can be made. For example, the configurations of the above-described Embodiment 1-C and Modification 1-F-1 can be realized separately from the configurations of Embodiments 1-A and 1-B. For example, the configuration can be applied not to be bonded by a bonding material. A sealed motor of the stator core 1-111 and the body portion 1-131, or a sealed motor not including the reinforcing member 1-150.

1-100‧‧‧Electric motor

1-111‧‧‧Standard core

1-112, 1-113‧‧‧ coil part

1-130‧‧‧Seal enclosure

1-131‧‧‧ Body Department

1-132‧‧‧The Department of Occlusion

1-133‧‧‧ openings

1-140‧‧‧stator bracket

1-141‧‧‧ bracket body

1-142‧‧‧ side panel

1-145, 1-147‧‧‧ recess

1-146‧‧‧Protruding

1-150, 1-160‧‧‧ reinforcing members

1-153, 1-154‧‧‧O-ring

1-161‧‧‧Part 1

1-162‧‧‧Part 2

1-163‧‧‧3rd part

1-171, 1-172‧‧‧Resin

AR‧‧‧Rotation center axis

S1‧‧‧ outside side

S2‧‧‧ link side

Claims (13)

A sealed motor is connected to a vacuum pump and used as a rotary drive source of the vacuum pump, the sealed motor includes: a stator core; a rotor disposed inside the stator core; and a non-conductive sealed casing disposed in the vacuum Separating the stator core from the rotor between the stator core and the rotor, and in a state of abutting against the stator core, the stator core is made of a resin, a ceramic, or a composite material of the materials; The sealed casing is joined to the stator core by a bonding agent, and the sealed motor further includes: an annular reinforcing member disposed on an outer side of the stator core in a direction of a rotation center axis of the rotor, the reinforcing member being circumferentially oriented a stator holder that receives the stator core, the stator holder has a protruding portion that protrudes inward from an inner surface thereof, and the annular reinforcing member abuts against the protruding portion . The sealed motor according to claim 1, wherein the linear expansion coefficient of the reinforcing member is equal to or less than a linear expansion coefficient of the stator core. The sealed motor according to the first aspect of the invention, wherein the stator core has a space between the end portions on the inner peripheral side of the plurality of teeth protruding toward the center of the stator core. a non-conductive member to which the tooth portion is engaged, and the aforementioned non-conductive member and The aforementioned sealed outer casing is joined by a bonding agent. The sealed motor according to claim 1, further comprising: a stator holder that fixes the stator core in a state in which the stator core is embedded in an inner space of the stator holder, the stator bracket being attached to the rotor The rotation center axis direction is formed longer than the stator core; and the resin is a locking space filled in a region formed between the stator holder and the sealing case, the region being rotated from the stator core Both ends in the central axis direction face a region corresponding to the coil portion that protrudes outside the stator core. The sealed motor according to claim 1, wherein the sealed casing has a hollow body portion extending in a direction of a rotation center axis of the rotor, and a closing portion in a direction of the rotation center axis The first side closes an inner space of the body portion; and the opening forms an opening of the body portion on a second side opposite to the first side; the blocking portion includes an inner diameter from the second side toward the front side The first side is reduced in diameter. The sealed motor according to claim 1, wherein the closing portion has a dome shape in which a central portion is convex toward the first side from the second side. The sealed motor according to claim 1, wherein At least one of the surface on the first side and the surface on the second side of the closing portion is formed with a rib. The sealed motor according to claim 1, further comprising: a stator holder for accommodating the stator core, wherein the annular reinforcing member has a first portion belonging to a portion orthogonal to a rotation center axis of the rotor And a second portion that abuts against the inner surface of the stator holder extending from the outer end portion of the portion orthogonal to the front side. A sealed motor is connected to a vacuum pump and used as a rotary drive source of the vacuum pump, the sealed motor includes: a stator core; a rotor disposed inside the stator core; and a sealed casing disposed on the stator core And a body portion having a hollow shape and an opening portion that is separated from the rotor and the rotor, and the hollow body portion extends toward a rotation center axis of the rotor, and the opening portion is formed An opening of the body portion on the first side of the side directly connected to the vacuum pump among the rotation center axis directions; wherein the stator core and the rotor are formed by the sealed casing and the sealed casing The outer surface of the opening is hermetically sealed by an O-ring disposed along the circumferential direction, and the sealed casing is formed of a resin, and the opening has a first portion from the body portion toward the rotation center The outer side of the sealed casing is formed in a direction in which the axial direction intersects; the second portion is formed from the first portion toward the first side; and the rib is formed in the first portion and the second portion The thickness of the first portion and the second portion is one time or more and two times or less the thickness of the body portion. The sealed motor according to claim 9, wherein the opening portion has a flange shape, and a thickness of the flange shape in a direction orthogonal to the rotation center axis is larger than a thickness of the body portion. . The sealed motor according to claim 9, wherein the outer surface of the body portion is formed with a segment portion in which the first side protrudes outward in the circumferential direction, and the segment portion and the stator iron are In the state in which the core abuts, the aforementioned sealed casing is mounted. The sealed motor according to claim 9, wherein the sealed casing has a closing portion that closes an internal space of the body portion on a second side opposite to the first side. A vacuum pump comprising the sealed motor according to any one of claims 9 to 12.