CN206283395U - A kind of slotless magnetic resistance outer rotor motor - Google Patents
A kind of slotless magnetic resistance outer rotor motor Download PDFInfo
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- CN206283395U CN206283395U CN201621430886.4U CN201621430886U CN206283395U CN 206283395 U CN206283395 U CN 206283395U CN 201621430886 U CN201621430886 U CN 201621430886U CN 206283395 U CN206283395 U CN 206283395U
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- iron core
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- core
- inner ring
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Abstract
The utility model is related to electric motors, discloses a kind of slotless magnetic resistance outer rotor motor, including stator, the first rotor, the second rotor, fixed shell, rotor transmission wheel disc, rotating shaft, bearing.Stator is made up of outer ring stator core, iron-core coil, inner ring stator core and winding coil.The first rotor by the first outer ring iron core, the first magnetic resistance iron core, the first inner ring iron core and the first tile permanent magnet group into.Second rotor by the second outer ring iron core, the second magnetic resistance iron core, the second inner ring iron core and the second tile permanent magnet group into.The stator of the utility model motor is not provided with teeth groove with rotor, air gap is uniform, eliminated during motor operation because of the tangential component of the magnetic action power that teeth groove is produced, reduce the tangential resistance of p-m rotor, reasonable distribution has been carried out to magnetic pole of the stator and rotor magnetic pole, the interaction force between rotor and stator is set to be more evenly distributed, the tangential stress equalization of rotor further increases the performance of permanent magnet motor.
Description
Technical field
The utility model is related to electric motors, more particularly to a kind of slotless magnetic resistance outer rotor motor.
Background technology
With the enhancing of environmental consciousness, electric automobile has obtained significant progress in recent years, so as to drive permanent-magnet electric
The development of machine technology.Teeth groove is generally provided between stator and rotor in current permanent magnet motor.
The Chinese patent of such as Application No. CN201110146689.5 discloses a kind of energy-saving permanent magnet motor, including fixed
Son and rotor, there is three equally distributed magnetic poles on the silicon sheet core of stator, each in the groove between these three magnetic poles
From the pole palm that one permanent-magnet material of setting-in is constituted, the both sides slapped in each magnetic pole and pole are designed with magnet exciting coil, and rotor is also to use
What permanent-magnet material was constituted, rotor is provided with six armature tooths of evagination, and the armature tooth is mutually corresponding with magnetic pole, the pole palm respectively,
Armature winding is provided with teeth groove.The utility model starts easy, and stabilization of speed significantly improves operating efficiency, good energy-conserving effect.
The Chinese patent of such as Application No. CN201010219190.8 discloses a kind of three-phase alternating current permanent magnet motor, bag
Include rotor and stator.The utility model sets 9M armature winding, sets 8M or 10M magnetic pole in rotor by stator
Number come realize three-phase alternating current permanent magnet motor left and right space, upper and lower space it is symmetrical, so as to substantially reduce engagement torque and list
Side magnetic pull.Required for being realized by the periodic arrangement of the permanent-magnet steel with same radial magnetic polarity and rotor teeth groove
The number of pole-pairs of rotor field, so as to greatly improve the mechanical strength of rotor magnetic steel and improve motor performance.
Above-mentioned permanent magnet motor is disadvantageous in that, the non-uniform air-gap between stator and rotor, when motor is operated
The teeth groove of the iron core of stator and rotor can produce the tangential component of magnetic action power, limit the rotation of permanent-magnet motor rotor
Efficiency.
On the other hand, the permanent magnet installation method of the p-m rotor of existing part high-power permanent magnet motor is not good enough, influence
The Mechanical Structure Strength of rotor, and the magnetic pole of the stator of existing part high-power permanent magnet motor owes with the distribution of rotor magnetic pole
It is good, also limit the performance of permanent magnet motor.
Utility model content
In order to solve the above-mentioned technical problem, the utility model provides a kind of slotless magnetic resistance outer rotor motor.This reality
With teeth groove is not provided between the stator and rotor of new slotless magnetic resistance outer rotor motor, air gap is uniform, when motor is operated
Eliminate because of the tangential component of the magnetic action power that teeth groove is produced, reduce the tangential resistance of p-m rotor, improve Permanent Magnet and Electric
The rotational efficienty of motivation rotor；Plug-type axile displacement collocation is carried out to the permanent magnet of rotor, has been provided with that structural capacity is strong to be turned
Sub- iron core, improves the rotor mechanical structure force of permanent magnet motor；Reasonable distribution is carried out to magnetic pole of the stator and rotor magnetic pole, has been made
Interaction force between rotor and stator is more evenly distributed, the tangential stress equalization of rotor, further increases permanent magnet motor
Performance.
Concrete technical scheme of the present utility model is：
A kind of slotless magnetic resistance outer rotor motor, including stator, the first rotor, the second rotor, fixed shell, rotor are passed
Runner disc, rotating shaft, bearing.
The stator is made up of outer ring stator core, iron-core coil, inner ring stator core and winding coil.The outer delineation
Sub- iron core, inner ring stator core are annular shape, and inner ring stator core is interior located at outer ring stator core and is provided with gap between the two,
Multiple iron-core coils are equally spaced and be connected as a single entity on the inner peripheral surface of outer ring stator core and with outer ring stator core；Plus
Work shaping the winding coil be sheathed on iron-core coil, and each winding coil around to identical, the winding of same phase
It is identical in the synchronization sense of current during coil electricity；More than one winding coil of each phase forms a phase in parallel or series
Winding coil；The position of correspondence iron-core coil is provided with link slot on the outer wall of inner ring stator core, and the other end of iron-core coil is consolidated
Due in the link slot；The magnetic pole that winding coil is formed when being powered constitutes magnetic pole of the stator.
The first rotor is by the first outer ring iron core, the first magnetic resistance iron core, the first inner ring iron core and the first tile permanent magnet
Composition., in annular shape, the first inner ring iron core is in the first outer ring iron core and two for first outer ring iron core, the first inner ring iron core
Gap is provided between person, between multiple first magnetic resistance iron cores are equidistantly located between the first inner ring iron core and the first outer ring iron core
Gap is divided into and the first magnetic resistance iron core size shape identical multiple tile-type groove, the first outer ring iron core and first in gap
Magnetic resistance iron core, the first inner ring iron core are connected as one；The first tile permanent magnet is inserted in the tile-type groove.
Second rotor is by the second outer ring iron core, the second magnetic resistance iron core, the second inner ring iron core and the second tile permanent magnet
Composition；Bitrochanteric internal structure is identical with the first rotor.
One end of the rotating shaft is driven the center gun iron link of wheel disc with the rotor, and the bearing is installed on the rotating shaft
Two ends, rotating shaft located at inner ring stator core endoporus in and bearing fixed with inner ring stator core；In the first of the first rotor
Circle iron core and bitrochanteric second inner ring iron core be sheathed on the outside of stator and the inwall of the first inner ring iron core respectively, in second
Air gap is left between the inwall and stator outer wall that enclose iron core.First outer ring iron core, the second outer ring iron core are provided with multiple axial directions
Rotor connecting hole, the first rotor and the second rotor are by the connecting pole in rotor connecting hole and rotor drive dish axle to string
Combine as a whole；The position of the first tile permanent magnet corresponds to the position of the second magnetic resistance iron core, the position of the first magnetic resistance iron core in the axial direction
Put the position of the second tile permanent magnet of correspondence；First tile permanent magnet, the second tile permanent magnet are radial magnetizing and both magnetic
Conversely, the magnetic pole of the magnetic pole of the first tile permanent magnet and the second tile permanent magnet is collectively constituted, S poles, N are extremely alternate to be turned for extreme direction
Sub- magnetic pole；Stator is equal with the number of pole-pairs of rotor magnetic pole per the number of poles of phase magnetic pole；Inner ring stator core is provided with multiple axial directions
Stator connecting hole, inner ring stator core is connected by the connecting pole in stator connecting hole with fixed support.
A kind of slotless magnetic resistance outer rotor motor of the present utility model, the outer surface of outer ring stator core is outside cylinder
Face, slotless；First inner ring iron core, the inner surface of the second inner ring iron core are inner cylinder face, slotless.In electric motor operation,
The first rotor, the second rotor are rotated, and due to no teeth groove, eliminate the magnetic produced by teeth groove between stator and rotor
The tangential component of active force, the air gap between stator and rotor is uniform, reduces the tangential resistance of p-m rotor, therefore improve
The rotational efficienty of permanent-magnet motor rotor.Additionally, the utility model has also carried out plug-type axially mistake to the permanent magnet of rotor
Position collocation, is provided with the strong rotor core of structural capacity, improves the rotor mechanical structure force of permanent magnet motor；To magnetic pole of the stator with turn
Sub- magnetic pole has carried out reasonable distribution, the interaction force between rotor and stator is more evenly distributed, the tangential stress equalization of rotor,
Further increase the performance of permanent magnet motor.
Preferably, the magnetic pole that the magnetic pole of the stator is formed when being powered by multiple winding coils of at least three-phase is constituted；
The magnetic pole that every phase magnetic pole of the stator is formed when being powered by least one winding coil is constituted.
Preferably, described outer ring stator core, iron-core coil, inner ring stator core, the first outer ring iron core, in first
Circle iron core, the first magnetic resistance iron core, the second outer ring iron core, the second inner ring iron core, the second magnetic resistance iron core are closed by silicon steel sheet or amorphous
Gold plaque is constituted with the axial punch closed assembly of rotating shaft；External cylindrical surface and slotless are formed on the outside of the outer ring stator core after closed assembly,
Inner cylinder face and slotless are formed after the first inner ring iron core, the inner side closed assembly of the second inner ring iron core.
Preferably, the overall axial both ends of the surface that the first rotor and the second rotor are constituted are provided with rotor cover plate.
Preferably, two end faces of the stator are provided with stator cover plate.
Preferably, first outer ring iron core, the second outer ring iron core, the annulus thickness of inner ring stator core are respectively greater than
First inner ring iron core, the second inner ring iron core, the annulus thickness of outer ring stator core.
The thickness of above-mentioned each part needs strict control, the first inner ring iron core, the second inner ring iron core, outer ring stator core
Annulus thickness is thick, influences magnetic field intensity, too thin and influence mechanical strength.
It is compared with the prior art, the beneficial effects of the utility model are：
1st, realize that the air gap between motor stator and rotor is uniform.
2nd, the tangential component of the magnetic action power that the teeth groove between stator and rotor is produced is eliminated, permanent magnet motor is improve
The rotational efficienty of rotor.
3rd, improve the rotor mechanical structure force of permanent magnet motor.
4th, the performance of permanent magnet motor is further increased.
Brief description of the drawings
Fig. 1 is a kind of cross-sectional view of the utility model the first rotor and stator；
Fig. 2 is a kind of cross-sectional view of the rotor of the utility model second and stator；
Fig. 3 is the utility model the first rotor and a kind of bitrochanteric schematic appearance；
Fig. 4 is a kind of distribution schematic diagram of the utility model the first rotor and the second rotor magnetic pole.
Reference is：The first rotor 1, the second rotor 2, stator 3, rotating shaft 4, bearing 5, fixed shell 6, rotor cover plate 7,
Air gap 8, rotor transmission wheel disc 9, the first outer ring iron core 10, the first magnetic resistance iron core 11, the first inner ring iron core 13, the first tile permanent magnetism
Iron 12, the second outer ring iron core 20, the second magnetic resistance iron core 21, the second tile permanent magnet 22, the second inner ring iron core 23, rotor connecting hole
26th, outer ring stator core 30, iron-core coil 31, inner ring stator core 33, winding coil 32, link slot 34, stator connecting hole 36,
Stator cover plate 37.
Specific embodiment
With reference to embodiment, the utility model will be further described.
Embodiment 1
So that three-phase, stator are per phase the two poles of the earth, rotor number of pole-pairs two pairs as an example, as shown in Figure 1, Figure 2, Figure 3 shows, a kind of slotless magnetic
Resistance outer rotor motor, including stator 3, the first rotor 1, the second rotor 2, fixed shell 6, rotor transmission wheel disc 9, rotating shaft 4, axle
Hold 5.
The stator is made up of outer ring stator core 30, iron-core coil 31, inner ring stator core 33 and winding coil 32.Institute
It is annular shape to state outer ring stator core, inner ring stator core, and inner ring stator core is in the stator core of outer ring and between the two
Gap is provided with, 6 iron-core coils are equally spaced and connect on the inner peripheral surface of outer ring stator core and with outer ring stator core
It is integrated；The winding coil of machine-shaping is sheathed on iron-core coil, and each winding coil around to identical, it is same
It is identical in the synchronization sense of current when winding coil of phase is powered；Two winding coils of each phase are formed in parallel or series
One phase winding coil；The position of correspondence iron-core coil is provided with link slot 34 on the outer wall of inner ring stator core, iron-core coil it is another
One end is fixed in the link slot；The magnetic pole that winding coil is formed when being powered constitutes magnetic pole of the stator.
The first rotor is by the first outer ring iron core 10, the first magnetic resistance iron core 11, the first inner ring iron core 13 and the first tile
Permanent magnet 12 is constituted.First outer ring iron core, the first inner ring iron core are located at the first outer ring iron in annular shape, the first inner ring iron core
In-core and gap is provided between the two, 2 the first magnetic resistance iron cores are equidistantly located at the first inner ring iron core and the first outer ring iron core
Between gap in gap is divided into and 2 tile-type grooves of the first magnetic resistance iron core size shape identical, the first outer ring iron
Core is connected as one with the first magnetic resistance iron core, the first inner ring iron core；2 the first tile permanent magnets are inserted in the tile-type groove
It is interior.
Second rotor is by the second outer ring iron core 20, the second magnetic resistance iron core 21, the second inner ring iron core 23 and the second tile
Permanent magnet 22 is constituted；Bitrochanteric internal structure is identical with the first rotor.
One end of the rotating shaft is driven the center gun iron link of wheel disc with the rotor, and the bearing is installed on the rotating shaft
Two ends, rotating shaft located at inner ring stator core endoporus in and bearing fixed with inner ring stator core；In the first of the first rotor
Circle iron core and bitrochanteric second inner ring iron core be sheathed on the outside of stator and the inwall of the first inner ring iron core respectively, in second
Air gap 8 is left between the inwall and stator outer wall that enclose iron core；First outer ring iron core, the second outer ring iron core are provided with multiple axial directions
The overall axial both ends of the surface that rotor connecting hole 26, the first rotor and the second rotor are constituted are provided with rotor cover plate 7, and on cover plate
It also is provided with rotor connecting hole.The first rotor and the second rotor are driven wheel disc by the connecting pole in rotor connecting hole and rotor
Axial series are integrated.As shown in figure 4, the position of the first tile permanent magnet corresponds to the position of the second magnetic resistance iron core in the axial direction,
The position of the position second tile permanent magnet of correspondence of the first magnetic resistance iron core；First tile permanent magnet, the second tile permanent magnet are
Radial magnetizing and both pole orientations are conversely, the magnetic pole of the first tile permanent magnet is collectively constituted with the magnetic pole of the second tile permanent magnet
S poles, N extremely alternate rotor magnetic pole；Stator is equal with the number of pole-pairs of rotor magnetic pole per the number of poles of phase magnetic pole；Two of the stator
End face is provided with stator cover plate 37, and stator cover plate and inner ring stator core are provided with the stator connecting hole 36 of multiple axial directions, stator
Cover plate, inner ring stator core are connected by the connecting pole in stator connecting hole with fixed support.The first rotor and second turn
The outside of son is driven wheel disc and is socketed with automotive hub by the rotor.
Wherein, described outer ring stator core, iron-core coil, inner ring stator core, the first outer ring iron core, the first inner ring iron
Core, the first magnetic resistance iron core, the second outer ring iron core, the second inner ring iron core, the second magnetic resistance iron core are by silicon steel sheet or amorphous alloy film
Constituted with the axial punch closed assembly of rotating shaft；External cylindrical surface and slotless are formed on the outside of the outer ring stator core after closed assembly, it is described
Inner cylinder face and slotless are formed after first inner ring iron core, the inner side closed assembly of the second inner ring iron core.
First outer ring iron core, the second outer ring iron core, the annulus thickness of inner ring stator core are respectively greater than the first inner ring
Iron core, the second inner ring iron core, the annulus thickness of outer ring stator core.
Wherein, every phase magnetic pole of the stator, the number of phases, rotor number of pole-pairs, the location mode of rotor magnetic pole：Stator circumference
It is divided into 2 big equal portions, each big equal portions is separated into 3 small equal portions and represents the phase of the number of phases 3, and each small equal portions represents a magnetic of a phase
Pole, each phase has 2 magnetic poles and represents every phase magnetic pole 2 in 2 big equal portions；Rotor number of pole-pairs is equal to and is per the number of phase magnetic pole
2 pairs, the number of rotor magnetic pole is 2 times as 4 of rotor number of pole-pairs, and rotor circumference is divided into 4 equal portions, and one is represented per equal portions
Rotor magnetic pole.
Additionally, magnetic pole of the stator of the present utility model and rotor magnetic pole can also be shown according to the form below data be allocated：
Magnetic pole of the stator and rotor magnetic pole distribution method：
Multiple magnetic that the magnetic pole of the stator is produced by three-phase or when leading to same direction current more than or equal to the winding coil of four phases
Pole constitutes；The multiple magnetic pole groups produced when leading to same direction current by the winding coil more than or equal to of same phase per phase magnetic pole
Into；The total pole number of the stator is multiplied by number of the stator per phase magnetic pole equal to the number of phases；The magnetic of the first tile permanent magnet
Pole and the magnetic pole of the second tile permanent magnet collectively constitute the alternate rotor magnetic pole in the South Pole, the arctic；The number of poles of stator per phase magnetic pole etc.
In the number of pole-pairs of rotor magnetic pole；Each winding coil around to identical；When the winding coil of same phase is powered, in synchronization
The sense of current is identical, and more than one winding coil of each phase forms a phase winding coil in parallel or series.,.
Raw materials used in the utility model, equipment, unless otherwise noted, is the conventional raw material, equipment of this area；This reality
With new middle method therefor, unless otherwise noted, the conventional method of this area is.
The above, is only preferred embodiment of the present utility model, and not the utility model is imposed any restrictions, every
Any simple modification, change and the equivalent transformation made to above example according to the utility model technical spirit, still fall within
The protection domain of technical solutions of the utility model.
Claims (6)
1. a kind of slotless magnetic resistance outer rotor motor, it is characterised in that：Including stator (3), the first rotor (1), the second rotor
(2), fixed shell (6), rotor are driven wheel disc (9), rotating shaft (4), bearing (5)；
The stator is by outer ring stator core (30), iron-core coil (31), inner ring stator core (33) and winding coil (32) group
Into；The outer ring stator core, inner ring stator core are annular shape, and inner ring stator core is located in the stator core of outer ring and both
Between be provided with gap, multiple iron-core coils be equally spaced on the inner peripheral surface of outer ring stator core and with outer ring stator iron
Core is connected as a single entity；The winding coil of machine-shaping is sheathed on iron-core coil, and each winding coil around to identical,
It is identical in the synchronization sense of current when winding coil of same phase is powered；More than one winding coil of each phase it is in parallel or
Series connection forms a phase winding coil；The position of correspondence iron-core coil is provided with link slot (34), line on the outer wall of inner ring stator core
The other end for enclosing iron core is fixed in the link slot；The magnetic pole that winding coil is formed when being powered constitutes magnetic pole of the stator；
The first rotor is by the first outer ring iron core (10), the first magnetic resistance iron core (11), the first inner ring iron core (13) and first watt
Piece permanent magnet (12) is constituted；, in annular shape, the first inner ring iron core is outside first for first outer ring iron core, the first inner ring iron core
Gap is provided with circle iron core and between the two, multiple first magnetic resistance iron cores are equidistantly located at the first inner ring iron core and the first outer ring
In gap between iron core by gap be divided into the first magnetic resistance iron core size shape identical multiple tile-type grooves, outside first
Circle iron core is connected as one with the first magnetic resistance iron core, the first inner ring iron core；The first tile permanent magnet is inserted in the tile-type
In groove；
Second rotor is by the second outer ring iron core (20), the second magnetic resistance iron core (21), the second inner ring iron core (23) and second watt
Piece permanent magnet (22) is constituted；Bitrochanteric internal structure is identical with the first rotor；
One end of the rotating shaft is driven the center gun iron link of wheel disc with the rotor, and the bearing is installed on the two of the rotating shaft
End, rotating shaft is in the endoporus of inner ring stator core and bearing is fixed with inner ring stator core；First inner ring iron of the first rotor
Core and bitrochanteric second inner ring iron core are sheathed on outside and the inwall of the first inner ring iron core, the second inner ring iron of stator respectively
Air gap (8) is left between the inwall and stator outer wall of core；First outer ring iron core, the second outer ring iron core are provided with turning for multiple axial directions
Sub- connecting hole (26), the first rotor and the second rotor by the connecting pole in rotor connecting hole and rotor drive dish axle to
Series connection is integrated；The position of the first tile permanent magnet corresponds to the position of the second magnetic resistance iron core in the axial direction, the first magnetic resistance iron core
The position of position the second tile permanent magnet of correspondence；First tile permanent magnet, the second tile permanent magnet be radial magnetizing and both
Pole orientation conversely, the magnetic pole of the magnetic pole of the first tile permanent magnet and the second tile permanent magnet to collectively constitute S poles, N extremely alternate
Rotor magnetic pole；Stator is equal with the number of pole-pairs of rotor magnetic pole per the number of poles of phase magnetic pole；Inner ring stator core is provided with multiple axial directions
Stator connecting hole (36), inner ring stator core is connected by the connecting pole in stator connecting hole with fixed support.
2. a kind of slotless magnetic resistance outer rotor motor as claimed in claim 1, it is characterised in that the magnetic pole of the stator by
The magnetic pole composition formed when at least multiple winding coils of three-phase are powered；Every phase magnetic pole of the stator is by least one winding wire
The magnetic pole composition that circle is formed when being powered.
3. a kind of slotless magnetic resistance outer rotor motor as claimed in claim 1, it is characterised in that described outer ring stator iron
Core, iron-core coil, inner ring stator core, the first outer ring iron core, the first inner ring iron core, the first magnetic resistance iron core, the second outer ring iron core,
Second inner ring iron core, the second magnetic resistance iron core are constituted by silicon steel sheet or amorphous alloy film with the axial punch closed assembly of rotating shaft；It is described
On the outside of the stator core of outer ring after closed assembly formed external cylindrical surface and slotless, the first inner ring iron core, the second inner ring iron core it is interior
Inner cylinder face and slotless are formed after the closed assembly of side.
4. a kind of slotless magnetic resistance outer rotor motor as claimed in claim 1, it is characterised in that the first rotor and the
The overall axial both ends of the surface that two rotors are constituted are provided with rotor cover plate (7).
5. a kind of slotless magnetic resistance outer rotor motor as claimed in claim 1, it is characterised in that two ends of the stator
Face is provided with stator cover plate (37).
6. a kind of slotless magnetic resistance outer rotor motor as claimed in claim 1, it is characterised in that first outer ring iron
Core, the second outer ring iron core, the annulus thickness of inner ring stator core are respectively greater than the first inner ring iron core, the second inner ring iron core, outer ring
The annulus thickness of stator core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621430886.4U CN206283395U (en) | 2016-12-24 | 2016-12-24 | A kind of slotless magnetic resistance outer rotor motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621430886.4U CN206283395U (en) | 2016-12-24 | 2016-12-24 | A kind of slotless magnetic resistance outer rotor motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206283395U true CN206283395U (en) | 2017-06-27 |
Family
ID=59071870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621430886.4U Active CN206283395U (en) | 2016-12-24 | 2016-12-24 | A kind of slotless magnetic resistance outer rotor motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206283395U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242877A (en) * | 2016-12-24 | 2018-07-03 | 重庆乔麦科技有限公司 | A kind of slotless magnetic resistance outer rotor motor |
-
2016
- 2016-12-24 CN CN201621430886.4U patent/CN206283395U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242877A (en) * | 2016-12-24 | 2018-07-03 | 重庆乔麦科技有限公司 | A kind of slotless magnetic resistance outer rotor motor |
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