KR20100033857A - Permanent magnetic motor and fluid charger comprising the same - Google Patents

Abstract

PURPOSE: A permanent magnet motor and a fluid charger thereof is provided to uniformly cool a primary cooling site and later cooling part by including a water cooling unit. CONSTITUTION: A rotor(150) includes a rotary shaft and a permanent magnet. The rotary shaft is supported inside a housing(110) to be rotatable. The permanent magnet is installed along the columnar direction of the rotary shaft. The stator(113) is arranged in the inner structure of the housing in order to surround the rotor. The stator includes the core unit and a winding unit. At least two bearings(171~173) supports the rotor in the housing to be rotatable. A water cooling unit(118) is arranged in the inner structure of the housing in order to cool the stator.

Description

Permanent magnet motor and fluid charger comprising the same

The present invention relates to a permanent magnet motor and a fluid charging device having the same, and more particularly, to a permanent magnet motor capable of efficiently cooling the rotor and all the bearing parts enabling the rotation of the rotor, and a fluid charging device including the same. It is about.

Fluid charging device is a device for supplying the suctioned fluid to the high pressure using the impeller. The fluid charging device may be a method of rotating the compressor by a turbine driven by exhaust gas from an internal combustion engine, such as a turbocharger, or may be a method of rotating the compressor directly by a motor.

The fluid charging device can supply the compressed fluid to a fuel cell by generating a constant pressure and flow rate by rotating the impeller at high speed. In particular, since the impeller is rotated at a high speed, it is possible to miniaturize and reduce the weight and can be utilized in various fields such as an air compressor, a gas compressor, a refrigerant compressor, a turbo blower, and an air supply device for a fuel cell.

The fluid charging device employing the latter method includes an impeller for compressing the fluid and a drive motor for providing rotational force to the impeller, which coaxially connects the rotor of the impeller and the drive motor and is integral with them. It is provided with a rotor that rotates. The rotor is supported by its rotational movement by a journal bearing mounted in the housing.

In the case where the drive motor is a permanent magnet motor, the rotor equipped with the permanent magnet is rotated by interaction with a stator which forms a magnetic pole by a winding of current flowing. In order to support the rotation of the rotor relative to the housing for supporting the stirrer, not only radial bearings are installed at each end of the rotor, but also thrust bearings are installed at each end.

Radiation and thrust bearings and the permanent magnets on the rotor shaft generate heat, so these areas must be cooled for smooth operation. In a conventional system of cooling with air from the impeller, the air from the impeller is relatively hot, causing the thrust bearing, the first radial bearing, the permanent magnet part of the rotor, and the second radial bearing to be cooled sequentially. When there is a problem that the temperature of the permanent magnet portion and the second radial bearing may exceed the limit temperature.

The present invention is to provide a permanent magnet motor and a fluid charging device having the same to allow the cooling in the portion to be cooled initially and the portion to be cooled later in the portion where the cooling air is sequentially cooled. The purpose.

In order to achieve the above and other objects, the present invention provides a rotor comprising: (i) a housing, (ii) a rotating shaft rotatably supported in the housing and a permanent magnet mounted along the circumferential direction of the rotating shaft, (Iii) a stator disposed within the housing so as to surround the rotor, the stator having a core portion and a winding portion functionally acting with the permanent magnet to rotate the rotor, (iii) the rotor with respect to the housing At least two bearings rotatably supporting, and (iii) a water cooling portion disposed in the housing, the water cooling portion cooling the stator, wherein the portion of the water cooling portion containing the cooling liquid cools the case of the at least one bearing. Disclosed is a permanent magnet motor disposed.

With this configuration, the cooling efficiency is improved by cooling the at least one bearing in a water-cooling manner with good cooling efficiency, thereby suppressing the phenomenon of exceeding the limit temperature of the parts.

The at least one bearing may be two radial bearings under the radial load of the rotary shaft and one thrust bearing under the axial load of the rotary shaft. The radial bearing or thrust bearing may be an air foil bearing. A portion of the water cooling section containing the coolant may be arranged to cool the case of the one radial bearing and the thrust bearing.

In another embodiment, in addition to the above embodiment, the winding end of at least one side and the at least one bearing which are disposed outside the core part of the winding part wound around the core part are overlapped in the longitudinal direction of the rotating shaft. Embodiments may also be arranged such that sections are generated. In this case, a portion of the water cooling unit accommodating the cooling liquid may be arranged to cool the bearings arranged such that a section overlapping in the longitudinal direction of the winding end of the one side and the rotation shaft does not occur. By such a configuration, it is possible to stably secure the vibration margin of the system by reducing the overall length of the rotor while maintaining the output performance of the rotor.

According to another aspect of the present invention, there is provided a rotor comprising: (i) a housing, (ii) a rotating shaft rotatably supported within the housing and a permanent magnet mounted along the circumferential direction of the rotating shaft, and (iii) surrounding the rotor. A stator disposed in the housing and having a core portion and a winding portion functionally acting with the permanent magnet to rotate the rotor, (i) at least two rotatably supporting the rotor with respect to the housing A bearing, (iii) an impeller fixed to one end of the rotor and discharging suction fluid at high speed and high pressure, (i) a scroll for guiding the fluid exiting the impeller, and (iii) within the housing, And a water cooling portion for cooling the stator, wherein a portion of the water cooling portion containing a cooling liquid cools the case of at least one bearing. A fluid boost device with a permanent magnet motor is disclosed disposed.

The at least one bearing may be two radial bearings under the radial load of the rotary shaft and one thrust bearing under the axial load of the rotary shaft. In this embodiment, air entering through the impeller flows sequentially toward the thrust bearing, the one radial bearing and the other radial bearing to cool the bearings. In addition, a portion of the water cooling unit for receiving a coolant may be arranged to cool the thrust bearing and the one radial bearing. According to such a configuration, since the portion to be cooled initially is also cooled by the water-cooling method in the manner in which cooling air is introduced and sequentially cooled, the temperature at the portion to be cooled later by the air exceeds the limit temperature of each part. Can be suppressed.

In another embodiment, in addition to the above embodiment, the winding end of at least one side and the at least one bearing which are disposed outside the core part of the winding part wound around the core part are overlapped in the longitudinal direction of the rotating shaft. Embodiments may also be arranged such that sections are generated.

According to the present invention, since the portion to be cooled initially is also cooled by the water cooling method in the manner in which cooling air is introduced and sequentially cooled, the temperature at the portion cooled later by the air exceeds the limit temperature of each part. It can be suppressed.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a fluid charging device having a permanent magnet motor according to an embodiment of the present invention. The illustrated fluid charging device 100 includes a housing 110, a scroll 120 coupled to one end of the housing 110 to form an appearance of the fluid charging device 100 together with the housing 110, and a housing. And a rotor 150 extending through the scroll 110 and rotatably supported. The housing 110 and the scroll 120 generally take a generally symmetrical shape with respect to the central axis C. One end of the housing 110 is formed with a flange 115 protruding in the circumferential direction for screwing with the scroll 120. The water cooling unit 118 is formed inside the housing 110, which will be described later.

Inside the scroll 120, an impeller 125 that is rotated at high speed is arranged to compress the working fluid. The air compressed by the impeller 125 is guided by the scroll 120 to rotate along its inner wall and is discharged through an exhaust pipe (not shown) formed at one side of the scroll 120, and then a fuel cell (not shown). It is supplied to a predetermined use place. The high speed rotation of the impeller 125 is supported by the rotor 150 extending along the central axis C. The rotor 150 includes a rotating shaft 151 constituting the skeleton and a permanent magnet 153 disposed on the rotating shaft 151 and assembled inside the housing 110. In addition, the rotor 150 may further include a sleeve member 155 surrounding the permanent magnet 153. The thrust disc 152 is integrally formed to protrude in the outer circumferential direction near the boundary between the housing 110 and the scroll 120 while being disposed on the rotation shaft 151.

The permanent magnet motor providing rotational power to the rotor 150 is fixed to the housing 110 with a permanent magnet 153 assembled on the rotor 150 and a gap between the permanent magnet 153 and a magnetic force interposed therebetween. It has the stator 113 which is a main structure. The stator 113 includes a core part 112 made of magnetic material and a winding part 111 wound around the core part 112. The rotating shaft 151 of the rotor is rotated by the electromagnetic interaction between the driving current input to the stator 113 as a movable signal and the permanent magnet 153 provided as a permanent magnet, and the impeller 125 coaxially connected thereto is input. It is driven at a fixed speed according to the current.

The rotor 150 is rotated at a high speed of about 30,000 rpm or more by the permanent magnet motor. The high speed rotation of the rotor 150 is provided with the rotary bearings 171 and 172 provided at both ends of the housing 110 for accommodating the rotor 150 and adjacent one end of the housing 110. Supported by a thrust bearing 173. The rotary bearing 171 and the thrust bearing 173 may be provided as an air foil bearing for supporting the rotating body by the compressed air film. At this time, the radial bearing 171 supports the radial load of the rotor 150 while maintaining a predetermined bearing clearance between the rotor 150. The thrust bearing 173 absorbs the axial load of the impeller 125 by supporting the thrust 152 projecting in the circumferential direction in a balanced manner on both sides. In this embodiment, the radial bearing 171 and the thrust bearing 173 is an example of an air foil bearing, but the protection scope of the present invention is not limited thereto.

The bearing elements 171, 172, 173, in particular the rotary bearings 171, 172, are preferably provided to a specification (diameter) of an appropriate level or higher in order to suppress the vibration of the rotor 150. On the other hand, the thrust 173 is preferably formed with a sufficient area to be provided with a fluid pressure capable of countering the expected axial load through its main surface.

The air compressed by the impeller 125 may be transferred to a fuel cell (not shown) through a flow path connected with the scroll 120, for example, and used for chemical reaction of the fuel cell. That is, the fuel cell chemically reacts the supplied high pressure air with hydrogen to produce a predetermined power, and the generated power is charged in a battery (not shown), and then the permanent magnet of the vehicle power source or fluid charging device 100. It can be used as a driving source of the motor. On the other hand, some of the air compressed by the impeller 125 or some of the low-temperature air sucked from the outside by the rotation of the impeller 125 is impeller 125, permanent along the cooling flow path provided inside the fluid charging device 100 It can be utilized as a cooling medium to prevent their overheating while passing through the magnet motor, bearing elements 171, 172, 173, etc., and the air converted to high temperature through a series of cooling passages is discharged as it is, or again impeller The process of returning to the 125 side and compressing with the other air can be repeated.

The permanent magnet motor and the fluid charging device 100 having the same according to an embodiment of the present invention employ a water cooling method in addition to the air cooling method described above. The water cooling unit 118 according to the exemplary embodiment is formed in the housing 110, and has an input port 116 that is a passage through which a coolant, for example, coolant, an output port 117 that passes through the coolant, and a coolant A portion to be filled, also known as a water jacket, is provided. In addition, a portion of the water jacket of the water cooling unit 118 may be further provided with a cooling fin 118a for promoting heat dissipation.

One portion of the water cooling portion 118 containing the coolant is disposed to be in contact with the core portion 112 of the stator to cool the stator 113, and the other portion of the water cooling portion 118 is the thrust bearing 173. And the shape is designed to substantially contact the case portion of the radial bearing 172 on the left side. Thus, the water cooling unit 118 further cools some of the bearings 172, 173. That is, since the thrust bearing 173 and the radial bearing 172 are already partially cooled by the water cooling unit 118, relatively hot air from the impeller 125 is discharged to the thrust bearing 173 and the radial bearing ( After passing through the 172 sequentially or simultaneously, the radial bearing 171 is cooled more effectively when the permanent magnet 153 and the radial bearing 171 on the right side are reached, so that the permanent magnet 153 and the radial There is an effect which can suppress that the temperature of the bearing 171 exceeds the limit temperature.

The rotor 150 may be configured by assembling the permanent magnet 153 and the sleeve member 155 to overlap each other on the stepped rotating shaft 151. The rotary shaft 151 supports the high speed rotation of the entire rotor 150 by the radial bearings 171 and 172 surrounding the rotary shaft 151.

The permanent magnet 153 generates a predetermined rotational force from the input electrical energy through electromagnetic interaction with the stator 113 provided in the housing 110. The permanent magnet 153 may be configured by combining at least two divided permanent magnet members. Alternatively, the permanent magnet 153 may be configured in an undivided form. The plurality of permanent magnets 153 are disposed at substantially equal intervals along the outer circumference of the rotation shaft 151. The length of the permanent magnet 153 in the axial direction is substantially equal to the effective length of the rotor. The effective length of the rotor is the length corresponding to the portion that generates electromagnetic interactions that affect the rotation of the rotor.

The sleeve member 155 surrounding the outer circumference of the permanent magnet 153 at a predetermined pressure functions to restrain the permanent magnet 153 from being separated from the rotation shaft 151 by the centrifugal force caused by the high speed rotation.

On the other hand, as another embodiment of a permanent magnet motor and a fluid charging device having the same, in addition to the above embodiment, the right winding end 111a and the right radial bearing 171 in the longitudinal direction of the rotation shaft 151 An embodiment in which the entire length of the rotor can be reduced by being arranged to generate overlapping sections is also possible.

To this end, the winding end 111a of the right side-the coil is wound in a predetermined order and direction according to the winding method, so that the end turn portion 111a is located on the outside of the left outer edge and the right outer edge of the core part 112. It is formed, and referred to as the winding end in the present application-is processed so as to open in the outer diameter direction from the center of the rotation shaft 151. This can be processed through a separate jig (not shown). For example, after inserting a substantially circular jig for extending the outer diameter to the ring-shaped winding end 111a, the winding end 111a may be opened in the outer diameter direction by opening the circular jig in the outer diameter direction.

In addition, when the coil is wound around the core portion 112 so as to pass through the slot (not shown) of the stator 113, the coil is disposed away from the center of the hollow of the core portion 112 in the slot, thereby including the winding end 111a. The winding part 111 may be disposed farther in the outer diameter direction from the center of the rotation shaft 151.

In this embodiment, by such methods, the section in which the winding end 111a on the right side overlaps in the longitudinal direction of the bearing 117 on the right side and the rotation shaft 151 may be generated. Even so, it does not affect the effective length of the rotor 150. Therefore, the output and speed of the rotor 150 can be maximized, but only the entire length of the rotor 150 can be reduced, thereby ensuring a stable vibration margin of the rotor 150.

On the other hand, the fluid charging device 100 according to the present invention can generate a fluid flow of a predetermined flow rate through the suction / compression action of the air, the technical principle of the present invention is a blower and a fluid compressor ( It is obvious that the same can be applied to the compressor. In addition, the fluid charging device 100 of the present invention can be operated equally for other working fluids, including the air illustrated above, depending on the application thereof.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and those skilled in the art to which the present invention pertains various modifications and other equivalent embodiments therefrom. You can understand that. Accordingly, the true scope of protection of the invention should be defined by the appended claims.

1 is a cross-sectional view of a permanent magnet motor and a fluid charge device having the same according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: fluid charging device 110: housing

110a: bearing case 111: winding part

111a: winding end 112: core part

113: stator 116: input port

117: output port 118: water cooling unit

120: scroll 125: impeller

150: rotor 151: rotation axis

152: Thrust Disc 153: Permanent Magnet

155: sleeve member 171, 172: radial bearing

173: thrust bearing

Claims (9)

housing; A rotor having a rotating shaft rotatably supported in the housing and a permanent magnet mounted along the circumferential direction of the rotating shaft; A stator disposed in the housing to surround the rotor, the stator having a core portion and a winding portion operatively functioning with the permanent magnet to rotate the rotor; At least two bearings rotatably supporting the rotor with respect to the housing; And It is disposed in the housing, the water cooling unit for cooling the stator; includes, A portion of the water cooling portion containing coolant liquid is arranged to cool the case of at least one of the bearings. The method of claim 1, The at least one bearing is two radial bearings under the radial load of the rotary shaft and one thrust bearing under the axial load of the rotary shaft, wherein the radial bearing or thrust bearing is an air foil Permanent magnet motor as an air foil bearing. The method of claim 2, A portion of the water cooling portion for receiving a coolant is arranged to cool the case of the one radial bearing and the thrust bearing. The method of claim 1, Permanent magnet motor of at least one side of the winding end and the at least one bearing disposed on the outer side of the core portion of the winding portion wound around the core portion is arranged so that a section overlapping in the longitudinal direction of the rotation shaft is generated. The method of claim 4, wherein The portion of the water cooling unit for receiving a cooling liquid is a permanent magnet motor arranged to cool the bearings arranged so that the section overlapping in the longitudinal direction of the winding end of the one side and the rotary shaft does not occur. housing; A rotor having a rotating shaft rotatably supported in the housing and a permanent magnet mounted along the circumferential direction of the rotating shaft; A stator disposed in the housing to surround the rotor, the stator having a core portion and a winding portion operatively functioning with the permanent magnet to rotate the rotor; At least two bearings rotatably supporting the rotor with respect to the housing; An impeller fixed to one end of the rotor to discharge suction fluid at high speed and high pressure; A scroll for guiding the fluid through the impeller; And It is disposed in the housing, the water cooling unit for cooling the stator; includes, And a portion of the water cooling section for receiving coolant is arranged to cool the case of the at least one bearing. The method of claim 6, The at least one bearing is two radial bearings under the radial load of the rotary shaft and one thrust bearing under the axial load of the rotary shaft, and the air introduced through the impeller is the thrust bearing. And a fluid charging device for cooling the bearings while sequentially flowing toward the one radial bearing and the other radial bearing. The method of claim 7, wherein And a portion of the water cooling section for receiving coolant is arranged to cool the thrust bearing and the one radial bearing. The method of claim 6, And at least one winding end and at least one bearing disposed at an outer side of the core part of the winding part wound around the core part such that a section overlapping in the longitudinal direction of the rotation shaft is generated.

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