Fan

FIELD: ventilation.

SUBSTANCE: vaneless fan includes nozzle 1 and device for creation of flow through it. Nozzle 1 has internal channel 10, outlet hole 12 for receiving the air flow from internal channel 10 and Koand surface 14 adjacent to outlet hole 12. The latter is located so that the air flow can be directed along that surface. Device for creation of the air flow through nozzle 1 is made in the form of impeller 30 brought into action with electric motor 22.

EFFECT: creation of more uniform air flow along the whole working surface of fan; more compact and safe design.

18 cl, 5 dwg

 

The invention relates to a fan, in particular to the household, such as desktop, to create air circulation and air flow in a room, office or other consumer environment.

There are various household fans, usually having a separate group of vanes or blades mounted for rotation about an axis, and the actuator mounted near the axis of rotation of the group of blades. Household fans come in various sizes and diameters, for example, a ceiling fan may have a diameter of more than 1 m and usually is suspended under the ceiling to create a flow of air downwards, providing cooling the entire room.

On the other hand, table fans often have a diameter of approximately 30 cm and are usually installed without fasteners being portable. In the standard table fans a separate group of blades is located close to the user, and the rotation of the fan blades provides in a room or part of the air flow forward toward the user. Fans of other types can be attached to the floor or mounted on wall. Movement and air circulation creates the so-called "cooling wind or light breeze and as a result, the user feels a cooling effect when the heat is dissipated by convection and evaporation. Fans, for example, op is sled in the document USD 103476, can be installed on the desktop or an ordinary table. In the document US 2620127 described fan dual-purpose, which can be installed on a window or used as a portable table fan.

In everyday life it is desirable that the devices were also small and compact. In the document US 1767060 described table fan with oscillation function that helps ensure that air circulation, equivalent to two or more well-known fans. You do not want from the household appliance played any part, or to enable the user to touch the moving parts of the fan, such as blades. The fan described in the document USD 103476, contains a grid around the blade. Other types of fans described in the documents US 2488467, US 2433795 and JP 56-167897. The fan on the document US 2433795 instead of the blades has a revolving screen, spiral grooves.

Some designs have a safety device, such as a lattice or a protective shield around the blade to protect the user from injury from contact with moving parts of the fan. However, closed with a grating parts of the blades are difficult to clean, and the movement of the blades in the air can create noise and discomfort for the user in the home or office.

The disadvantage of such designs is that the user does not feel even the viginia air flow, created by a fan, driven by changes in the transverse direction of the blades or facing the outside surface of the fan. Irregular or intermittent air flow can be felt as a series of pulses or impulses of the air. Another disadvantage is that created by the fan cooling effect decreases with distance from the user. This means that the fan must be placed in close proximity to the user, so that he could benefit from the action of the fan.

The location of the fans, such as described above, next to the user is not always possible, because the bulky shape and design mean that the fan occupies a significant area in the workspace of the user. In particular, the housing or the fan base that is installed on your desktop or next to it, reduces the area available for the placement of documents, computer or other office equipment.

The shape and design of the fan placed on the desktop, not only reduces available to the user working area, but can also close the lighting (natural or artificial), leaning on the table. For hard work and to read the necessary well-lit work Desk. In addition, good lighting reduces the voltage GLA and reduces the corresponding health problems, which may occur as a result of long periods of work in low light conditions.

The invention is directed to the creation of an improved fan that does not have the disadvantages of known devices.

The objective of the invention is to create a fan, which during operation generates a uniform air flow across the work surface of the fan. Another object of the invention is to create a fan, with which the user is at some distance from him can feel the air flow and cooling effect is improved compared with known fans.

According to the invention safe fan for creating a flow of air includes a nozzle and means for creating air flow through it, the nozzle has an inner channel, an outlet for receiving air flow from the inner channel and the Coanda surface adjacent to the outlet, and the outlet is located so as to direct the flow of air on the surface.

Due to this configuration, to create air flow and cooling effect requires no blade fan. Safe construction allows to achieve low noise impact due to the absence of sound from the fan blades moving through the stream of ozdoba, and fewer moving parts and reduced design complexity.

Hereinafter in the description, the term "safe" is used to describe devices in which the air flow is produced in the front from the fan direction without the use of blades. On this basis, we can assume that safe fan has an output region or area of release without vanes or blades, from which the air flow goes in the direction that is acceptable to the user. Safe fan can be supplied with air by using a source of primary air from a variety of sources or generating means, such as pumps, generators, motors or other devices for supplying a fluid medium, which includes a rotating device, such as a rotor of the motor and fan to create air flow. The flow generated by the motor of the air forces the air to pass from the space or environment surrounding the fan, the inner channel to the nozzle and then out through the outlet.

The fan itself does not provide a detailed description of the power supply, motors and components required, for example, to run the fan secondary functions. Secondary functions of the fan can be, e.g. the, lighting, control and oscillation fan.

Safe fan provides the release and the cooling effect described above, by using a nozzle that includes a Coanda surface to create a region of amplification, using the Coanda effect. The Coanda surface is a known type of surface, providing the effect of the Coanda effect on the flow emerging from the outlet openings near the surface. The environment tends to occur close to the surface, almost "sticking" or "strongly pressed to the surface. The Coanda effect is already tested and convincingly confirmed by way of suction, where the primary air flow is directed over the Coanda surface. Description of surface features Coanda effect flow environment on such a surface can be found in articles, for example, Reba, Scientific American, vol 214, June 1963, p.84-92.

Mainly the nozzle forms an opening through which air from outside the fan sucked air flow directed over the Coanda surface. Mainly using this configuration can be designed and manufactured the fan with a smaller number of parts than in the known fans. This reduces manufacturing costs and complexity of manufacture.

According to the invention, the air flow is created with the SIP is using a nozzle of the fan. In the further description of this flow of air will be referred to as primary. The primary stream of air emerges from the nozzle through the outlet and preferably passes through the Coanda surface. The primary flow of air sucked in the air around the discharge outlet of the nozzle, which acts as an amplifier of the flow of both primary and trapped air. Entrapped air in the future will be called the secondary air flow. The secondary air flow is drawn from the premises, site or external environment surrounding the outlet nozzle near the fan. The primary air flow is directed over the Coanda surface and combined with the secondary air flow captured by the amplifier of air, gives the total air flow produced or carried in the direction of the user from the hole formed by the nozzle. The total air flow is sufficient to create cooling.

Air flow, portable this fan to the user, has the advantage that it has low turbulence and a more linear flow profile than the profile created by other known devices. Linear air flow with low turbulence effectively moved from the release point, and loses less energy and has less speed loss on turbulence than air pot is to, created well-known by the fans. The advantage for the user is that the cooling effect can be felt even at a distance, this increases the overall efficiency of the fan. This means that the user can choose the location for the fan at some distance from the working area to feel the cooling effects of the fan.

Mostly fan provides the suction of the air surrounding the outlet nozzle, so that the primary air flow was increased at least 15%, at the same time maintaining a smooth General release. Suction performance and enhance the fan allow you to get a fan with a higher efficiency as compared to known devices. The air flow discharged from the formed nozzle hole has an approximately rectangular plot of velocity with respect to the diameter of the nozzle. In General, the speed and the flow profile can be described as for plug flow conditions, with some areas having laminar or partially laminar flow.

Preferably the nozzle contains a loop. The shape of the nozzle is not limited to the requirement to include space for blade fan. In a preferred embodiment of the invention the nozzle is annular. Using circular SOP is and the fan has the potential to serve a wide area. In another preferred embodiment of the invention the nozzle is at least partially circular. This configuration can provide many options for the design of the fan, increasing the choice available to the user or customer.

Preferably the inner channel is continuous. This provides a smooth free flow of air in the nozzle, reduces friction losses and reduces noise. In this configuration, the nozzle may be manufactured as a single part, which reduces the design complexity and thus reduces production costs.

The outlet may be essentially circular. By essentially annular outlet total air flow may be produced in the direction of the user in a wide area. Mainly the light source in the room or in the setup table fan or natural light can reach the user through the Central hole.

Predominantly outlet concentric inner channel. This configuration will have an attractive appearance, and is concentric with the channel location outlet facilitates manufacture. Preferably the surface of the Coanda continues symmetrically about the axis. More preferably the angle between the surfaces is part of the Coanda and the axle is 7-20, preferably about 15. This provides an effective primary air flow over the Coanda surface and leads to maximum absorption of air and the maximum secondary air flow.

Preferably the nozzle in the direction of the axis continues to a distance of at least 5 cm, and around an axis, preferably at a distance of 30-180 see It provides options of air release in a range of different areas of production and size of the holes, for example, it may be suitable for cooling the upper body and face of a user when he is working behind a Desk. In a preferred embodiment of the invention, the nozzle includes a diffuser located after the Coanda surface. The angular configuration of the surface of the cone and the shape of the airfoil surface of the nozzle can improve the reinforcing properties of the fan and at the same time to minimize the noise impact and friction losses.

In a preferred embodiment of the invention, the nozzle includes at least one wall forming the inner channel and the outlet. This at least one wall includes opposite surface forming the outlet. Preferably the distance between the opposite surfaces at the exit of the outlet part of yet 1-5 mm, more preferably about 1.3 mm using this configuration, the nozzle may be required properties of the flow direction of the primary air flow over the Coanda surface and to have a relatively uniform or close to uniform General flow of air reaching the user.

In a preferred embodiment, the fan means for creating air flow through the nozzle contains an impeller driven by an electric motor. In this run the fan effectively creates air flow. More preferably the means for creating air flow contains a brushless direct current motor and a diagonal impeller. This design reduces friction losses from the brushes of the motor, and reduces the amount of the graphite particles from the brushes in the traditional motors. Reducing the number of particles of graphite and carbon emissions is an advantage in terms of purity or contamination sensitive environments such as hospitals or places where people are suffering from allergies.

The nozzle can rotate or be rotated relative to the base or other part of the fan. This allows you to direct the nozzle as needed to the user or from him. The fan may be a desktop, floor, or fastened to the wall or ceiling. This may increase custompagesize, in which the user feels cooling.

Option of carrying out the invention is described hereinafter with reference to the drawings.

Fig 1 shows a fan, front view;

figure 2 - part of the fan shown in figure 1, a perspective view;

figure 3 is a section along a-a in figure 1;

figure 4 is a fragment of the fan shown in figure 1, on an enlarged scale, a side view in section;

figure 5 is a section along b-b In figure 3, shown in the direction of the arrow F.

Figure 1 shows an example run of the fan 100, front view. The fan 100 includes an annular nozzle 1 forming the Central hole 2. As shown in figure 2 and 3, the nozzle 1 has an internal channel 10, the discharge opening 12 and the surface 14 Coanda adjacent to the outlet 12. The surface 14 Coanda located such that the flow of primary air emerging from the outlet openings 12 and directed to the surface 14 Coanda, increases due to the Coanda effect. The nozzle 1 is mounted on a base 16, containing the outer body 18. The base 16 has several located on the outer housing 18 of the buttons 20 to control the fan 100.

The base 16 is an electric motor 22 to create an air flow through the nozzle 1. The base 16 has an inlet opening 24 for air formed in the outer casing 18. In base 16 is a casing 26 elec is radiates, which is based on a motor 22 and is held in fixed position by means of the rubber bearing or sealing element 28.

In the shown embodiment of the invention, the motor 22 is a brushless direct current motor, with the shaft connected to the impeller 30. After the impeller 30 is the diffuser 32. The diffuser 32 has secured a stationary disk having spiral blades.

The entrance 34 to the impeller 30 is connected to the input port 24 for air formed in the outer casing 18 of the base. Outlet of the impeller 30 and the output 36 of the diffuser 32 is connected with the hollow sections of the channels or passages located in the base 16 to provide passage of air from the impeller 30 to the inner channel 10 of the nozzle 1. The motor 22 is connected to an electric connector and a power source and controlled by a control unit (not shown). The connection between the control unit and several buttons 20 allows the user to control the fan 100.

Next, with reference to figure 3 and 4 will be described structural features of the nozzle 1. The nozzle 1 has a ring shape, and in this embodiment of the invention, its diameter is about 350 mm, However, the nozzle may have any desired diameter, for example, about 300 mm, an Inner channel 10 is annular and you Olsen in the form of a continuous loop or passage in the nozzle 1. The nozzle 1 is formed by at least one wall bounding the inner channel 10 and the outlet 12. The nozzle 1 includes an inner wall 38 and outer wall 40. In the shown embodiment of the invention the walls 38 and 40 form a loop or bend, so that the inner wall 38 and outer wall 40 are approaching each other. Inner wall 38 and outer wall 40 together form the exhaust hole 12 passing around the axis X. the Outlet 12 has a plot 42, tapering towards the outlet 44. The output 44 is a gap or distance between the inner and outer walls 38 and 40 of the nozzle 1. The distance between the opposite surfaces of the walls 38 and 40 at exit 44 of the outlet 12 is selected in the range of 1-5 mm, the Choice of this distance depends on the required performance characteristics of the fan. In this embodiment of the invention, the output 44 has a width of about 1.3 mm, while the exhaust port 12 and the outlet 44 concentric inner channel 10.

The outlet opening 12 adjacent to the surface 14 Coanda, which is the diffuser section of the nozzle 1. Diffuser section includes surface 46 to facilitate the flow of the air flow generated by the fan 100. In the example shown in figure 3, the discharge opening 12 and General configuration of the nozzle 1 is made so that the angle between the Ernesto 14 Coanda and the X-axis is approximately 15. The angle is selected to provide sufficient air flow across the surface 14 Coanda. The base 16 and the nozzle 1 have a depth in the direction of the axis X about 5 cm Surface 46 of the diffuser and the overall profile of the nozzle 1 is based on the shape of the airfoil, and in the shown example, the diffuser section continues for a distance equal to approximately two thirds of the total depth of the nozzle 1.

The fan 100 is as follows.

After the user makes the appropriate selection and press the selected button 20 for control or actuation of the fan 100, sends a signal to the actuation of the motor 22. The motor 22 is activated and air is sucked into the fan 100 through the inlet 24. In a preferred embodiment of the invention, the air intake is a performance about 20-30 l/s, preferably about 27 l/C. the Air flows through the outer body 18 and the trajectory of the arrow F in figure 3, is fed to the input 34 of the impeller 30. Air discharged from the outlet 36 of the diffuser 32 and the outlet of the impeller 30, is divided into two streams moving in opposite directions along the inner channel 10. The air flow in the narrows at the entrance to the outlet 12 and additionally narrows at the output 44. The air flows out of the outlet 44 as the PE the primary air flow.

The release of the primary flow of air creates a region of low pressure at the inlet 24, providing the absorption of additional air into the fan 100. The action of the fan 100 creates a lot of air flow through the nozzle 1 and provides its output through port 2. A primary stream of air is directed over the surface 14 Coanda and the surface 46 of the diffuser, amplified due to the Coanda effect. Secondary air flow created by the suction of air from the external environment, in particular from the area around the outlet 44 and around the outer edge of the nozzle 1. Part of the secondary flow of intake air primary air flow can be directed over the surface 46 of the diffuser. This secondary air flow passes through the hole 2, where it is combined with the primary air flow for forming the common thread that is moved forward of the fan 100 with a flow rate in the range from 500 to 700 l/C.

The combination of suction with increased flow results in the total flow of air from the holes 2 of the fan 100, which exceeds the flow of air from the fan without the Coanda surface adjacent to the area of release.

Increasing the flow and laminar flow result in a steady flow of air sent to the user from the nozzle 1. Performance on the distance from the user to 3 diameters of the SOP is a (ie approximately 1000-1200 mm) is about 400-500 l/s Total air flow has a speed of approximately 3-4 m/s High speed is achieved by reducing the angle between the surface 14 Coanda and the axis X. a Small angle results in a more focused overall air flow. This air flow usually has a high speed, but reduced mass flow. On the contrary, a large mass flow rate can be achieved by increasing the angle between the Coanda surface and the axis. In this case, the speed of the generated air flow is reduced, but consumption increases. Thus, the operating characteristics of the fan can be changed by changing the angle between the Coanda surface and the x axis.

The invention is not limited to the above description. The specialist in this field of technology understandable embodiments of the invention. For example, the fan may have a different height or diameter. The base and the nozzle of the fan can be of different depth, width and height. The fan can be installed on the table, he can stand without mounting or can be mounted on wall or ceiling. The shape of the fan can be adapted to any situation or place, where the required cooling air flow. Portable fan can have a small nozzle, for example, with a diameter of 5 cm Tool with the building air flow through the nozzle may be an electric motor or other device, creating a flow of air, such as compressor or vacuum unit that can be used to create the fan air flow in the room. The motor may be, for example, asynchronous AC motor or brushless DC motor, however, can be any suitable device moving or transportation of air, for example a pump or other means of creating a straight air flow. After the motor can be located diffuser or secondary diffuser to recover some portion of the static pressure loss in the casing of the electric motor and the electric motor.

The output from the exhaust hole may be modified: expanded or narrowed down to different sizes to maximize air flow. The Coanda effect can be obtained in a number of different surfaces, or the number of internal or external structures can be used together to obtain the desired flow and suction.

In addition, the nozzle can have other forms. For example, can be used nozzle oval shape or form "treadmill", single strip, line, or block. Since you have access to the Central part of the fan due to the lack of blades in the aperture formed by the nozzle, can bytesperline additional structural elements, for example, backlight, clock or LCD display.

In addition, the base may be rotary or tilting, so it's easy to move and adjust the position of the nozzle.

1. Safe fan for creating a flow of air containing the nozzle, and through it of air flow, the nozzle has an inner channel, an outlet for receiving air flow from the inner channel and the Coanda surface adjacent to the outlet, and the outlet is located so as to direct the flow of air on the surface.

2. The fan according to claim 1, in which the nozzle forms an opening through which air from outside the fan sucked air flow directed over the Coanda surface.

3. The fan according to any one of claims 1 or 2, wherein the nozzle contains a loop.

4. The fan according to any one of claims 1 or 2, in which the nozzle is essentially circular.

5. The fan according to any one of claims 1 or 2, in which the nozzle is at least partially circular.

6. The fan according to any one of claims 1 or 2, in which the inner channel is continuous.

7. The fan according to any one of claims 1 or 2, in which the inner channel is essentially circular.

8. The fan according to any one of claims 1 or 2, in which the outlet is essentially circular.

9. Fan p is any one of claims 1 or 2, in which the exhaust hole is concentric with the internal channel.

10. The fan according to any one of claims 1 or 2, in which the Coanda surface located symmetrically around the axis.

11. The fan of claim 10, in which the angle between the Coanda surface and the axis is 7-20, preferably about 15.

12. The fan of claim 10, in which the nozzle in the direction of the axis continues to a distance of at least 5 cm

13. The fan of claim 10, in which the nozzle passes around the axis at a distance of 30-180 see

14. The fan according to any one of claims 1 or 2, wherein the nozzle includes a diffuser located after the Coanda surface.

15. The fan according to any one of claims 1 or 2, wherein the nozzle includes at least one wall forming the inner channel and the outlet, and an opposite surface forming the discharge outlet.

16. The fan according to any one of claims 1 or 2, in which the distance between the opposite surfaces at the exit of the outlet is 1-5 mm

17. The fan according to any one of claims 1 or 2 in which the means for creating air flow through the nozzle contains an impeller driven by an electric motor.

18. The fan 17 in which the means for creating an air stream contains a brushless direct current motor and a diagonal impeller.



 

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FIELD: ventilation.

SUBSTANCE: invention relates to fan engineering and can be used as a component of space technology temperature control systems. The technical result is achieved by a fan unit comprising a casing including a cylindrical boring and two flanges with axial holes, two bushes are coaxial to the casing and connected to it by piers; an electric motor is set in each bush and its shaft is equipped by an impeller set inside the cylindrical boring. The casing consists of two parts; the first flange is fitted at the end face of the first casing part and the second one - of the second casing part. A bush with piers is placed in each casing part; the first flange is fitted with threaded holes; the flanges are contacting with each other and interconnected by screws screwed into the threaded holes and passing through the axial holes of the second flange with the screw heads being placed on the second flange side; the outer surface of the first casing part is cylindrical along the section from its free end face to the first flange and the first flange axial holes are projecting beyond the second flange outline.

EFFECT: ensuring repairability and increasing variety of the fan unit assembly patterns.

1 dwg

FIELD: electric engineering.

SUBSTANCE: invention relates to electric engineering, namely - to electric machines, and deals with the specific features of fixing elements design for electric motors, particularly, fan sets intended for heating, ventilation and/or air-conditioning plants. This invention proposes a device (40) for fixing electric motor (16) containing accommodating seat (41) for motor installation with a wall (42). According to the invention, the device (40) for fixing electric motor (16) implemented so that the first (18A) and second (18B) air pumping element can be rotated. The air pumping element includes accommodating seat (41) to install electric motor (16) and a wall (42). Besides, the obstructing elements (60, 62; 72, 74, 76; 80) are placed between the electric motor (16) and accommodating seat (41) wall (42). The obstructing elements are implemented so that they can obstruct air flowing between electric motor (16) and wall (42) of accommodating seat and air flow be redirected through electric motor (16).

EFFECT: improved cooling of electric motor and ensured control of different heating, ventilation and/or air conditioning equipment parameters.

21 cl, 9 dwg

Compression unit // 2455530

FIELD: machine building.

SUBSTANCE: compressor unit (1) comprises a compressor (5), a suction line (2) and a return line (3), a block (20) that controls the compressor (5). Moreover, in line (2) the suction is ensured by at least one device (21, 22) to detect amounts of non-gaseous fluid medium in the fluid to be compressed, on their way to the entrance to compressor (5), and detection device (21, 22) is connected to management block (20) ensuring signal transmission, and compressor unit (1) contains dissolution unit (30), which dissolves the amount of non-gas on its way to the entrance of compressor (5), while the dissolution is initiated when the amount of detected non-gaseous fluid exceeds a certain limit.

EFFECT: any damage caused by a number of non-gaseous fluid into the suction inlet to the compressor is excluded.

7 cl, 1 dwg

Fan // 2458254

FIELD: ventilation.

SUBSTANCE: vaneless fan 100 for creation of the air flow includes nozzle 1 installed on the housing of base 16 for creation of the air flow passing through it. Nozzle 1 has internal channel 10 for receiving the air from base 16 and outlet hole 12 through which the air flow is discharged. Nozzle 1 is essentially located orthogonally to the axis and forms hole 2 through which the air is injected from outer side of fan 100 due to the air flow leaving the outlet hole 12. Both nozzle 1 and base 16 have the depth in the direction of axis; at that, depth of base 16 does not exceed double depth of nozzle 1. As an alternative, fan 100 has the height measured from the end of base 16, which is the most distant from nozzle 1, to the end of nozzle 1, which is the most distant from base 16, and width which is perpendicular to the height. At that, both the height and the width are perpendicular to the axis, and width of base 16 does not exceed 75% of nozzle 1 width.

EFFECT: fan has compact design.

25 cl, 5 dwg

Fan // 2458255

FIELD: ventilation.

SUBSTANCE: vaneless fan includes nozzle 1 and device for creation of flow through it. Nozzle 1 has internal channel 10, outlet hole 12 for receiving the air flow from internal channel 10 and Koand surface 14 adjacent to outlet hole 12. The latter is located so that the air flow can be directed along that surface. Device for creation of the air flow through nozzle 1 is made in the form of impeller 30 brought into action with electric motor 22.

EFFECT: creation of more uniform air flow along the whole working surface of fan; more compact and safe design.

18 cl, 5 dwg

Blower assembly // 2460904

FIELD: engines and pumps.

SUBSTANCE: blower assembly 10 is designed to create air jet. Blower comprises outlet 14 arranged on bed. Said bed comprises outer housing 16 and case 64 of impeller 52 arranged in outer housing 16. Case 64 has air inlet 70 and air outlet and houses impeller 53 and its drive motor 56 to force airflow through case 64. Aforesaid outlet has inner chamber 86 to direct airflow from impeller case 64 and constricted section 26 for airflow to be forced out from blower 10. Flexible sealing element is arranged between outer housing 16 and case 64 of impeller 52.

EFFECT: reduced air loss and noise, increased airflow.

19 cl, 17 dwg

FIELD: machine building.

SUBSTANCE: proposed plant comprises housing accommodating motor stator with multiphase winding, compressor compression radial-flow stage flow section fixed elements, housing cover accommodating stator elements of plant rotor magnetic suspension system bearings, and plant rotor carrying rotor elements of bearings and compressor and motor rotary assemblies. Note here that motor stator magnetic core is made up of sections, their number complying with that of compression stages. Magnetically and electrically not conducting separation cylinders are arranged between said sections. Note here that stator winding is shared by all sections and laid in core section and separation cylinder grooves. Every integrated rotary assembly of compressor and motor comprises impeller. Said impeller inlet has guide channels to feed gas to impeller inlet while motor rotor section is located there outside. Note also that magnetic coupling between motor and rotor sections is ensured by fixed cylinders made from electrically nonconducting materials with built-in cores made up of thin stacks of radial plates of electric steel.

EFFECT: decreased overall dimensions.

2 cl, 2 dwg

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