CN1122348C

CN1122348C - Motor stator

Info

Publication number: CN1122348C
Application number: CN00109409A
Authority: CN
Inventors: 李康雨
Original assignee: Samsung Gwangju Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 1999-12-24
Filing date: 2000-06-22
Publication date: 2003-09-24
Anticipated expiration: 2020-06-22
Also published as: JP2001186694A; CN1308400A; KR20010064050A

Abstract

To provide a stator for electric motors that interacts with a rotor magnetically. A first yoke having a plurality of circumferential wall members that are arranged in a circumferential shape to receive a rotor, and a radius wall member that projects radially from the outer-periphery surface of the circumferential wall members; a cylindrical second yoke that is provided separately from the first yoke and is arranged so that it surrounds the first yoke, and has an inner-periphery surface in that the terminal of the radius wall member of the first yoke touches; and a plurality of excitation coils that are wound around the radius wall members of the first yoke; are included. As a result, a coil is easily wound around the first yoke of a stator, thus improving working efficiency, reducing torque change being generated when an electric motor is operated, and hence reducing vibration and noise and improving the performance of the electric motor.

Description

The stator that motor is used

Technical field

The present invention relates to a kind of motor that comprises stator and rotor, more particularly, relate to a kind of improved stator that is used for this motor.

Background technology

Usually, motor is used to convert electrical energy into mechanical energy.This motor comprises a stator and a rotor usually.Stator comprises an excitation coil, and it produces magnetic force, and rotor is rotated in stator by the magnetic interaction with the magnetic force that is produced by stator.

At first can better understanding be arranged to the present invention by understanding traditional motor.With reference to figure 7 and Fig. 8, wherein Fig. 7 is used for the stator of traditional motor and the decomposition diagram of rotor, and Fig. 8 is the top plan view of stator and the rotor of Fig. 7, and traditional motor comprises rotor 103 and centers on the stator 109 of rotor 103.

Rotor 103 is made for column and by a plurality of chip (not shown) that superpose.At the center of rotor 103 hole or hole 105 are set and are used to hold the rotating shaft (not shown), rotating shaft is used for the revolving force of rotor 103 is delivered to such as being driven the part (not shown).Periphery at rotor 103 is provided with a plurality of permanent magnets 107, and its generation is used for the magnetic field with stator 109 magnetic interaction.

Stator 109 comprises the equidistant secondary yoke portion 111 of radially extending of the main yoke portion 113 of column, a plurality of inner rim around main yoke portion 113 and is wrapped in excitation coil 117 in the secondary yoke portion 111.Each secondary yoke portion 111 all is made of radial wall spare 111a, and its inner prop radial surface from main yoke portion 113 extends internally and annular or arched member 111b, and its far-end from radial elements 111a stretches out.Arched member 111b forms the circle of an interruption, and it has identical center with main yoke portion 113, but internal diameter is less.Excitation coil 117 vertically is wrapped on the radial wall spare 111a of secondary yoke portion 111.

Utilize above-mentioned motor, when by the external power source (not shown) during to electrical power, the electric current that flows in the excitation coil 117 on being wrapped in the secondary yoke portion 111 of stator 109 produces magnetic field.As a result, because radially being provided with, a plurality of secondary yoke portion 111 forms aforesaid circumference, so can produce revolving magnetic flux.Because the effect of the revolving force that revolving magnetic flux produces makes the rotor 103 of motor be rotated.

Fig. 9 is the schematic diagram of the moment distribution of the motor of the aforesaid traditional stator of use.Rotating part is carried out selection at random, the figure shows the variation of moment between the rotation emergence period relatively in selected rotating part.Therefore, the Y-axle among Fig. 9 is represented moment and X-axle express time.

Figure 10 represents to use the distribution schematic diagram of magnetic density of the motor of traditional said stator, wherein shows the flux density distribution of a certain seclected time during rotor 103 rotations.As shown in the figure, the x-axle is represented the anglec of rotation, and the y-axle is represented magnetic density.In the curve of Figure 10,, thereby expressed the magnetic flux of negative (-) because the N-and the S-utmost point of the permanent magnet 107 of rotor 103 be arranged alternately.In fact Figure 10 represents the magnetic flux distributions by the represented two kinds of different conditions that go out of curve A and curve B.Curve A among Figure 10 is represented normal state, and curve B is represented the state that is magnetized.Normal condition and magnetized state all are to draw according to the experiment that distinct methods carried out of using difform magnet and installation magnet.

In above-mentioned traditional motor,, therefore only provide limited space because secondary yoke portion 111 extends (promptly outstanding or stretch out) from main yoke portion 113 to rotor 103.As a result, twining excitation coil 117 in secondary yoke portion 111 can existing problem.In addition, because the annular wall part 111b of secondary yoke portion 111 forms with radial wall spare 111a is whole, so when winding excitation coil 117, can't use bobbin.

In addition, because in shown traditional motor, form a gap between the annular wall part 111b of secondary yoke portion 111, so that the moment that produces during machine operation presents is wavy, as shown in Figure 9, wherein the size of moment produces fluctuation in time.In addition, as shown in Figure 10, the maximum and the variation between the minimum value of magnetic density are relatively large, same also frequent the changing of magnetic density.Therefore, the torque fluctuations in the motor output is also very big, and the result causes noise and vibrations to increase, and the negative operating efficiency that influences motor.

Summary of the invention

One object of the present invention is to provide a kind of stator of the motor that addresses the above problem, particularly, a kind of stator that is used for motor is provided, wherein excitation coil can be easily and is wrapped in reliably in the secondary yoke portion of stator, and wherein the magnetic density that is produced by excitation coil changes in limited scope.

In order to realize these purposes of the present invention, a kind of motor is provided, in this motor, comprise a rotor, one the stator that carries out magnetic interaction with rotor, wherein stator comprises:

A main yoke in use is used for the rotor around motor, and comprises the wall spares that a plurality of peripheries extend, and each all has an outer surface and a plurality of radially wall spare, and this wall spare radially extends and comprises far-end from the outer surface outward radial of wall spare.

The secondary yoke of a cylindricality is arranged to around the main yoke, and described secondary yoke and described rotor yoke provide separately, and has the inner circumferential surface with the distal engagement of the described radial wall spare of described main yoke; And

A plurality of excitation coils on a plurality of described radial wall spares that are wrapped in described main yoke respectively.

Best, stator also comprises the bobbin that the radial wall spare of a plurality of and described main yoke links to each other, and excitation coil is wrapped on the bobbin.

Preferably the main yoke also comprises a plurality of connectors between the wall spare that described periphery extends, thereby the adjacent wall spare of the wall spare that described a plurality of periphery extends is joined together by one of them connector, connector is thinner than peripheral wall extension spare, thereby forms recess between described adjacent wall spare.

Be preferably in (i) described main yoke described radial wall spare far-end and (ii) form engaging groove among in the inner periphery surface of described secondary yoke, and the copulational protuberance that engages with described engaging groove be formed on (i) described main yoke described radial wall spare far-end and (ii) on the another one in the inner periphery surface of described secondary yoke.

According to another aspect of the present invention, in employed motor, comprise a rotor, the stator with the rotor magnetic interaction, this stator comprises:

A main yoke, it comprises a cylindrical member, and this cylindrical member has an inner surface and a plurality of radial wall spare that extends internally from the inner periphery surface of cylindrical member and comprises far-end;

Secondary yoke is arranged on the inside of main yoke with one heart, and comprises the wall spare of a plurality of annulars, and the annular wall part is with the distal engagement of the radial wall spare of main yoke; And

A plurality of excitation coils are wrapped on the radial wall spare of main yoke.

Best, stator also comprises the bobbin that radial wall spare a plurality of and the main yoke links to each other, and excitation coil is wrapped on the bobbin.

Best, secondary yoke also comprises a plurality of connectors between the annular wall part, thereby the continuous wall spare of described a plurality of annular wall parts is connected together by a connector, and connector is thinner than annular wall part, thereby forms recess between described adjacent wall spare.

In a preferred embodiment, form an engaging groove at the far-end of each radial wall spare of main yoke, and a plurality of copulational protuberance is formed on the outer periphery surface of secondary yoke, copulational protuberance engages with each engaging groove.

In the another one preferred embodiment, in the outer periphery surface of secondary yoke, form a plurality of engaging grooves, on the far-end of each radial wall spare of main yoke, form copulational protuberance, each copulational protuberance all engages with each engaging groove of described a plurality of engaging grooves.

Other feature and advantage of the present invention will obtain clearer understanding by following detailed description of the preferred embodiment.

Description of drawings

Other advantage and purpose of the present invention will be by obtaining clearer and more definite understanding below in conjunction with the respective drawings detailed description of the preferred embodiment.

Fig. 1 is the decomposition diagram of motor stator according to an embodiment of the invention and rotor;

Fig. 2 is the assembled stator of Fig. 1 and the vertical view of rotor;

Fig. 3 be according to another preferred embodiment motor stator and the decomposition diagram of rotor;

Fig. 4 is the stator assembled among Fig. 3 and the vertical view of rotor;

Fig. 5 is the moment distribution schematic diagram of the motor of use stator of the present invention;

Fig. 6 is the schematic diagram according to the different magnetic flux distributions of the motor of use stator of the present invention;

Fig. 7 is the stator of aforesaid conventional motors and the decomposing schematic representation of rotor;

Fig. 8 is the stator assembled among aforesaid Fig. 7 and the vertical view of rotor;

Fig. 9 is the schematic diagram of moment distribution of the motor of aforesaid use traditional stator;

Figure 10 is the schematic diagram of flux density distribution of the motor of aforesaid use traditional stator.

Embodiment

Referring to Fig. 1 and Fig. 2, wherein as implied above, Fig. 1 is the stator of motor and the decomposition diagram of rotor of being used for according to an embodiment of the invention, and Fig. 2 is the stator of assembling of Fig. 1 and the vertical view of rotor, and shown motor comprises a rotor 3 and around the stator 9 of rotor 3.

Rotor 3 forms for column and by a plurality of chip (not shown) that superpose.At the center of rotor 3 hole or hole 5 are set and are used to hold the rotating shaft (not shown), rotating shaft is used for the revolving force of rotor 3 is delivered to such as being driven the part (not shown).A plurality of permanent magnets 7 that are used for carrying out with stator 9 magnetic interaction are set on the neighboring of rotor 3.In the present embodiment, with the form of column 12 permanent magnets are set, and its N utmost point and the S utmost point are arranged alternately.

Stator 9 comprises main yoke or yoke portion 20 that holds rotor 3 and secondary yoke or the yoke portion 30 that centers on the columnar shape of main yoke portion 20.Main yoke portion 20 comprises a plurality of annular wall extension spares 21 that are provided with one heart with respect to secondary yoke portion 30, a plurality of radial wall spares 23 stretch out or outstanding from the outer periphery surface of wall spare 21, a plurality of connectors 27, it links to each other adjacent annular wall part, and and annular wall part 21 form column together, and a plurality of outstanding or projection 25 of a plurality of each outer ends that are formed on radial wall spare 23.Connector 27 is compared thickness with annular wall part 23 and is reduced, thereby forms recess 27a between adjacent annular wall part 21.The magnetic characteristic that recess 27a provides, it can guarantee that the magnetic force that is produced concentrates on the transverse end of annular wall part 27.

On the inner rim of secondary yoke portion 30, be formed for holding the engaging groove 31 of projection 25.Projection 25 is thinner than radial wall part 23, and the width of engaging groove 31 is adapted at wherein holding each projection 25.

As can be seen from Figure 1, on the radial wall spare 23 of main yoke portion 20, bobbin 29 is set, and the excitation coil 28 that is used to produce magnetic force is wrapped in bobbin 29.

As mentioned above, Fig. 3 is stator according to another preferred embodiment and the decomposition diagram that is used for the rotor of motor, and Fig. 4 is the assembling stator of Fig. 3 and the vertical view of rotor.As shown in FIG., stator 9 comprises main yoke or a yoke portion 40 and a secondary yoke or a yoke portion 50 that is provided with one heart that is generally column in main yoke portion 40.The outstanding or projection 45 thinner on the radial wall spare 43 that main yoke portion 40 comprises a cylindrical member 41, radially extend from the inner rim of cylindrical member 41 and the inner that is formed on radial wall spare 43 than radial wall part 43.

Secondary yoke portion 50 comprises a plurality of annular wall parts 51, and annular wall part 51 is along the periphery setting of being separated by, and links together by a plurality of connectors 53 that are formed between the adjacent wall spare 51.On the neighboring of wall spare 51, form engaging groove 51a in the position of (promptly aiming at) corresponding with each projection 45 of main yoke portion 40, be used for holding respectively these projections 45.

The connector 53 of secondary yoke portion 50 is thinner than annular wall part 51, thereby forms recess 53a between annular wall part 51.As first embodiment of Fig. 1 and Fig. 2, recess 53a provide magnetic characteristic, and wherein magnetic force concentrates on the transverse end of annular wall part 51.

As shown in Figure 3, on the radial wall spare 43 of main yoke portion 40 bobbin 49 is set, excitation coil 48 is wrapped on each bobbin 49, is used to produce required magnetic force.

In the embodiment of Fig. 1 and Fig. 2 and Fig. 3 and Fig. 4, available excitation coil 28 and 48 twines bobbin 29 and 49 respectively, can be mounted or be fixed on the radial wall spare 23 and 43 of

main yoke portion

20 and 40 then.Thus, excitation coil 28 and 48 winding are very easy.In addition, when

main yoke portion

20 and 40 combined with

secondary yoke portion

30 and 50, the projection 25 and 45 that is formed on

main yoke portion

20 and 40 was bonded with each other by the engaging groove 31 and 51 with

secondary yoke portion

30 and 50, thereby whole combination is very firm.

Fig. 5 represents the schematic diagram for the moment distribution of the motor of the rotating part employing stator of selecting at random of the present invention.Curve shows during rotation the variation of the moment that the different time is produced in selected rotating part.As shown in the figure, the y-axle is represented to be used for the moment values that drive motors produces, and x-axle express time.

Fig. 6 is and the schematic diagram that uses according to the relevant flux density distribution of the motor of stator of the present invention.Show the flux density distribution of selected time at random with respect to the position of the permanent magnet 7 that surrounds rotor 3.As shown in the figure, the x-axle is represented the anglec of rotation of the position of corresponding permanent magnet 7, and the y-axle is represented magnetic density.

In Fig. 6, the magnetic density of a utmost point of permanent magnet is expressed as (+), and the magnetic density of the another one utmost point is expressed as (-).The state that curve A among Fig. 6 ' expression normal condition, and curve B wherein ' expression is magnetized, similar with curve A and B among Figure 10.Normal condition and magnetized state are respectively to using the experiment that difform magnet and different installation methods are done.

In stator 9 according to the present invention, annular wall part 21 and 51 and connector 27 and 53 whole formation.As a result, between radial wall spare, do not form the gap, thereby stop so-called torque fluctuations.Figure 5 illustrates this situation, the wherein level and smooth in time variation of moment, thus can derive the optimal value of moment in view of the above according to rotational time.

As shown in Figure 6, by using according to stator of the present invention, the position of permanent magnet relatively, it is constant that magnetic flux keeps basically.

The above embodiments are limited to such structure, promptly wherein combine with radial wall spare 23 and 43 excitation coil 28 and 48 being wrapped on bobbin 29 and 49 back bobbin 29 and 49.Yet,, also can overcome or problem that minimizing is relevant with conventional motors even directly be wrapped on radial wall spare 23 and 43 when excitation coil 28 and 48.

In the above embodiments, projection 25 and 45 is formed on radial wall spare 23 and 43, and engaging groove 31 and 51a are formed on secondary yoke portion 30 and 50.Yet, needing clear and definite to be, projection 25 and 45 also can be formed on

secondary yoke portion

30 and 50, and the engaging groove 31 and the 51a that hold projection can be formed on radial wall spare 23 and 43.In addition, also main yoke portion and secondary yoke portion directly can be cooperated, and need not use projection or engaging groove.

Therefore can find out that by top description the present invention can more easily be wrapped in coil in the main yoke portion of stator of the present invention, assembling motor more efficiently.Can obtain simultaneously best moment.Owing to can reduce the fluctuation of moment, thereby can eliminate noise and fluctuation basically.As a result, compare the operating efficiency that can improve motor greatly with the motor that uses above-mentioned traditional stator.

Though invention has been described in conjunction with the preferred embodiments, need clear and definite to be, for those of skill in the art, to its various variation made from revise all within the spirit and scope of the present invention.

Claims

1. one kind is used in and comprises a rotor, and the stator in motor with the mutual magnetic action stator of rotor is characterized in that described stator comprises:

A main yoke is used for the rotor around motor, and comprises the wall spares that a plurality of peripheries extend, and each all has an outer surface and a plurality of radially wall spare, and wall spare radially extends and comprises far-end from the outer surface outward radial of described wall spare.

The secondary yoke of a cylindricality is arranged to around described main yoke, and described secondary yoke and described main yoke provide separately, and has the inner circumferential surface with the distal engagement of the described radial wall spare of described main yoke; And

2. stator according to claim 1 is characterized in that, also comprises the bobbin that the radial wall spare of a plurality of and described main yoke links to each other, and excitation coil is wrapped on the described bobbin.

3. stator according to claim 1, it is characterized in that, described main yoke also comprises a plurality of connectors between the wall spare that described periphery extends, thereby the adjacent wall spare that described a plurality of periphery extends is joined together by one of them connector, described connector is thinner than peripheral wall extension spare, thereby forms recess between described adjacent wall spare.

4. stator according to claim 1, it is characterized in that, at the far-end of the described radial wall spare of (i) described main yoke with (ii) form engaging groove among in the inner periphery surface of described secondary yoke, the copulational protuberance that engages with described engaging groove be formed on (i) described main yoke described radial wall spare far-end and (ii) on the another one in the inner periphery surface of described secondary yoke.

5. one kind is used in and comprises a rotor, and the stator in motor with the mutual magnetic action stator of rotor is characterized in that described stator comprises:

A secondary yoke is arranged on the inside of described concentric main yoke, and comprises the wall spare of a plurality of annulars, and the annular wall part is with the distal engagement of the radial wall spare of described main yoke; And

A plurality of excitation coils are wrapped on the radial wall spare of described main yoke.

6. stator according to claim 5 is characterized in that, described stator also comprises the bobbin that the radial wall spare of a plurality of and described main yoke links to each other, and described excitation coil is wrapped on the bobbin.

7. stator according to claim 5, it is characterized in that, secondary yoke also comprises a plurality of connectors between described annular wall part, thereby the continuous wall spare of described a plurality of annular wall parts is connected in together, described connector is thinner than described annular wall part, thereby forms recess between described adjacent wall spare.

8. stator according to claim 5, it is characterized in that, form an engaging groove in the far-end of each described radial wall spare of described main yoke, and a plurality of copulational protuberance is formed on the outer periphery surface of described secondary yoke, described copulational protuberance engages with described each engaging groove.

9. stator according to claim 5, it is characterized in that, form a plurality of engaging grooves in the outer periphery surface of described secondary yoke, form copulational protuberance on the far-end of each described radial wall spare of main yoke, each copulational protuberance all engages with each engaging groove of described a plurality of engaging grooves.