TWI389428B - Inner type of motor and a claw-pole stator thereof - Google Patents

Description

Inner rotor motor and its claw pole piece

The present invention relates to a motor structure, and more particularly to an inner rotor type motor and a claw pole piece thereof which are easy to start and prevent a function of starting dead point.

Referring to Fig. 1, there is shown an exploded perspective view of a conventional "outer rotor type motor". The conventional outer rotor type motor 8 generally includes a base 81, a stator 82, and a rotor 83. The base 81 is provided with a shaft tube 811. The stator 82 includes a plurality of claw pole pieces 821 and a coil set 822. The plurality of claw pole pieces 821 are integrally stacked with each other. The coil set 822 is wound around each of the claws. A predetermined portion of the pole piece 821; the rotor 83 is rotatably coupled to the shaft tube 811 of the base 81. Thereby, the stator 82 is used to drive the rotor 83 to rotate.

In addition, the Republic of China Announcement No. M342688 "Motor Stator" new patent case, Publication No. 200603514 "Motor Structure" invention patent case, Announcement No. I276281 "Motor Stator Structure" invention patent case, Announcement No. I244817 "DC motor" Etc., respectively, the "outer-rotor type motor" having various structures are disclosed; in short, the above-mentioned various "outer-rotor type motors" generally use a stator of a special structure to form an uneven magnetic force, thereby achieving a function of starting offset. Each of the "outer rotor motors" has a function of being easy to start and preventing a dead point of starting.

In general, various conventional motor structures currently available on the market include an "inner rotor type motor" in addition to the "outer rotor type motor" disclosed above; when analyzing two different types of motor structural characteristics, " Compared with the "internal rotor type motor", the outer rotor type motor has problems such as poor rotational stability and low rotation speed. Since today's electronic products are generally developed in the direction of high speed, functional integration and miniaturization, The "outer rotor motor" does not fully meet the heat dissipation requirements of some electronic products, resulting in the increasingly widespread use of "inner rotor motors".

For example, the invention patent of the "Fan and its inner rotor motor" of the Republic of China Public Publication No. 200744290 discloses an inner rotor type motor. Referring to FIG. 2, the conventional inner rotor motor 9 generally includes a housing 91, a stator structure 92, a rotor structure 93, a driving device 94, and an impeller 95. The housing 91 is composed of a first housing 911 and a second housing 912, and a bearing 913 is disposed inside the first housing 911 and the second housing 912. The stator structure 92 has a guide. The magnetic component 921 has a rotating shaft 931 and a magnetic component 932. The rotating shaft 931 is disposed inside the casing 91 and pivotally connected to the two bearings 913. The magnetic component 932 can be coupled to the rotating shaft. 931 and corresponding to the magnetic conductive element 921; the driving device 94 is electrically connected to the magnetic conductive element 921; the impeller 95 is coupled to the rotating shaft 931 and is located outside the housing 91. Thereby, the driving device 94 can control the current direction of the magnetic conductive element 921 to drive the rotor structure 93 and the impeller 95 to rotate.

However, the magnetic guiding element 921 of the above-described inner rotor type motor 9 can only drive the rotation of the rotor structure 93, and does not provide easy starting and prevention of starting dead point, etc.; therefore, although the inner rotor type motor is compared with the outer rotor type The motor generally has the advantages of better rotation stability and higher rotation speed. However, since the conventional inner rotor type motor 9 cannot effectively improve problems such as poor start control and failure to effectively prevent the start dead point, it is still used. The need for improvement.

The object of the present invention is to improve the problem that the above-mentioned "inner rotor type motor" has poor start control and cannot prevent the start dead point, and to provide an inner rotor type motor and a claw thereof which are easy to start and prevent the start dead point. Extreme piece.

In order to achieve the foregoing object, the technical content of the present invention is as follows: an inner rotor type motor comprising a casing, a rotating shaft, a claw pole piece and a coil set. The shaft is rotatably coupled to the outer casing, the rotating shaft is coupled with a permanent magnet having a magnetic sensitive surface, the permanent magnet is located inside the outer casing; the claw pole member is coupled to the inner portion of the outer casing, and the claw pole member has a loop portion. The ring portion has an inner annular surface, the inner annular surface is provided with a plurality of poles, one end of each pole is connected to the inner annular surface, and the other end is combined with a pole piece, and the two opposite directions of the axial direction of the pole piece The side edges are respectively a first side edge and a second side edge, and a magnetic pole face is formed between the first side edge and the second side edge, the magnetic pole face faces the magnetic sensitive surface of the permanent magnet, and the magnetic pole face An air gap is formed between the magnetic sensitive surfaces, and the pole pieces respectively form an enlarged diameter portion adjacent to the first side edge and a reduced diameter portion adjacent to the second side edge to form the air gaps with unequal spacing; The coil assembly incorporates a pole of the claw pole piece.

An inner rotor type motor comprising a casing, a rotating shaft, a claw pole piece and a coil assembly. The shaft is rotatably coupled to the outer casing, the rotating shaft is coupled with a permanent magnet having a magnetic sensitive surface, the permanent magnet is located inside the outer casing; the claw pole member is coupled to the inner portion of the outer casing, and the claw pole member has a loop portion. The ring portion has an inner annular surface, the inner annular surface is provided with a plurality of poles, one end of each pole is connected to the inner annular surface, and the other end is combined with a pole piece, and the two opposite directions of the axial direction of the pole piece The side edges are respectively a first side edge and a second side edge, and a magnetic pole face is formed between the first side edge and the second side edge, the magnetic pole face faces the magnetic sensitive surface of the permanent magnet, and the magnetic pole face An air gap is formed between the magnetic sensitive surfaces, the claw pole member defining a reference line extending axially from the magnetic pole surface, and a reference surface defining a central axis of the annular portion and a central axis of the pole. The reference line is located on the reference surface, the reference line is divided into a first magnetic pole surface and a second magnetic pole surface, the first magnetic pole surface is located between the first side edge and the reference line, the first a second magnetic pole surface is located between the second side edge and the reference line, the first Pole surface area of the area of the second magnetic pole surface are different; the pole of the coil assembly in conjunction with the claw pole member.

The above and other objects, features and advantages of the present invention will become more <RTIgt; As shown, the inner rotor type motor of the first embodiment of the present invention comprises a casing 1, a rotating shaft 2, a claw pole member 3 and a coil assembly 4. The outer casing 1 is a hollow casing; the rotating shaft 2 is rotatably coupled to the outer casing 1; the claw pole member 3 is coupled to the inner casing 1 and opposite to the rotating shaft 2; the coil assembly 4 is wound around the casing The predetermined portion of the claw pole piece 3; thereby, the coil set 4 is energized to cause the claw pole piece 3 to generate a magnetic field to drive the rotating shaft 2 to rotate.

The outer casing 1 is mainly used for the joint of the claw pole piece 3, and the pivot shaft 2 is pivotally connected. Therefore, the outer casing 1 can be any structural design capable of achieving the above object; in the embodiment, the outer casing 1 is The housing 11 is formed by a casing 11 and a closure member 12. The opposite ends of the casing 11 respectively define a through hole 111 and an opening 112. The sealing member 12 is coupled to the opening 112. A plurality of bearings 13 (only one bearing 13 may be provided), one of which may be coupled to one side of the perforation 111, and the other bearing 13 may be coupled to the closure 12.

The shaft 2 is pivotally coupled to the plurality of bearings 13 via the through hole 111 such that the shaft 2 is rotatably coupled to the outer casing 1; one end of the rotating shaft 2 can extend outside the outer casing 1, and the rotating shaft 2 is combined A permanent magnet 21 having a magnetic sensitive surface 211, the permanent magnet 21 being located inside the outer casing 1.

The claw pole piece 3 may be stacked on a plurality of claw pole pieces to form the claw pole piece, or may be integrally formed into a single block claw pole piece, preferably a claw pole piece formed as shown in the figure. 3, to improve manufacturing convenience. As shown in FIG. 5, the claw pole piece 3 of the present embodiment is coupled to the inside of the outer casing 1. The claw pole piece 3 has a loop portion 31 having an inner annular surface 311, the inner annular surface The 311 is provided with a plurality of poles 32 extending radially toward the center of the ring portion 31. One end of each pole 32 is coupled to the inner ring surface 311, and the other end is coupled to a pole piece 33. The pole piece 33 has a first side edge 331 and a second side edge 332 opposite to the opposite side edges of the pole piece 33 in the axial direction. The first side edge 331 and the second side A magnetic pole surface 333 is formed between the edges 332. The magnetic pole surface 333 faces the magnetic sensitive surface 211 of the permanent magnet 21, and an air gap (G) is formed between the magnetic pole surface 333 and the magnetic sensitive surface 211.

More specifically, in the radial section of the pole piece 33 of the claw pole piece 3 (mainly in the direction of FIG. 5), the pole piece 33 forms an enlarged diameter portion adjacent to the first side edge 331, respectively. 33a, and a reduced diameter portion 33b adjacent to the second side edge 332, wherein the diameter-enlarged portion 33a and the reduced diameter portion 33b are formed to have different radial cross sections, for example, only on the first side edge When the 331 is formed into an expanded diameter design, the second side edge 332 has a smaller radial cross section relative to the first side edge 331 or the first side edge 331 is only formed when the second side edge 332 forms a reduced diameter design. The second side edge 332 is a relatively large radial cross section; thereby, the air gap distance between the enlarged diameter portion 33a and the permanent magnet 21 is smaller than between the reduced diameter portion 33b and the permanent magnet 21 Air gap distance to form unequal spacing air gaps (G). Moreover, the manner in which the claw pole piece 3 of the present invention is used to form the enlarged diameter portion 33a and the reduced diameter portion 33b can be roughly divided into the following types (only preferred embodiments, and other embodiments belonging to the same technical concept should still be Covered by the present invention):

As shown in FIG. 5, the radial cross-sectional area of the pole piece 33 is gradually reduced based on the direction of the claw pole piece 3 from the first side edge 331 toward the second side edge 332; Thereby, the enlarged diameter portion 33a and the reduced diameter portion 33b are formed.

Secondly, as shown in FIG. 6, the pole piece 33 of the claw pole piece 3 forms a notch 34 on the second side edge 332. With the design of the notch 34, the pole piece 33 can be adjacent to the first piece. The radial cross-sectional area of the two side edges 332 is smaller than the radial cross-sectional area adjacent to the first side edge 331; therefore, the enlarged diameter portion 33a and the reduced diameter portion 33b can be formed by a simpler processing method.

Thirdly, as shown in FIG. 7 , the magnetic pole surface 333 of the claw pole piece 3 forms a convex portion 35 adjacent to the first side edge 331 , and the design of the convex portion 35 can be used. The radial cross-sectional area of the pole piece 33 adjacent to the first side edge 331 is greater than the radial cross-sectional area adjacent to the second side edge 332; thereby, the convex portion 35 can be utilized to effectively strengthen the structural strength of the pole piece 33, and The enlarged diameter portion 33a and the reduced diameter portion 33b can be formed.

The coil assembly 4 can be wound around the pole post 32 of the claw pole piece 3. The two ends of the claw pole piece 3 are preferably combined with the two insulating sleeves 36 before being wound by the coil assembly 4; The two insulating sleeves 36 may be omitted, and an insulating layer (not shown) is formed directly on the surface of the claw pole pieces 3 to provide an insulating effect. Moreover, please refer to FIG. 5 again, wherein the opposite sides of the pole post 32 of the claw pole piece 3 can respectively form a first winding space 321 and a second winding space 322, and the claw pole piece 3 is In the radial direction, the first winding space 321 is at a distance (D1) from the inner ring surface 311 of the ring portion 31 to the pole piece 33, and preferably the second winding space 322 is at the ring portion 31. The distance (D2) of the inner ring surface 311 to the pole piece 33 is the same; thereby, since the distance (D1) of the first winding space 321 is the same as the distance (D2) of the second winding space 322, therefore, when When the coil group 4 is wound around the pole 32, the coil group 4 wound around the first winding space 321 and the second winding space 322 can be distributed evenly to facilitate the winding operation.

The main feature of the rotor type motor according to the first embodiment of the present invention is that the magnetic pole can be designed by the enlarged diameter portion 33a and the reduced diameter portion 33b of the pole piece 33 of the claw pole piece 3 by the structural features disclosed above. An unequal spacing air gap is formed between the surface 333 and the magnetic sensitive surface 211; thereby, when the coil assembly 4 is energized, the magnetic resistance of the air gap (G) located in the enlarged diameter portion 33a of the claw pole piece 3 is Forming an asymmetrical state with the magnetic resistance of the air gap (G) located in the reduced diameter portion 33b to form an uneven magnetic force, thereby achieving a starting offset effect, so that the inner rotor type motor of the present invention has an easy start and a start dead point prevention. efficacy.

Referring to Figures 8, 9, and 10, the inner rotor type motor of the second embodiment of the present invention comprises a casing 1, a rotating shaft 2, a claw pole member 5 and a coil assembly 4. The outer casing 1, the rotating shaft 2 and the coil assembly 4 are the same as those disclosed in the first embodiment, and are not described herein.

The claw pole piece 5 of the second embodiment of the present invention has the same ring portion 51, inner ring surface 511, pole post 52, first winding space 521, and second winding space as the claw pole piece 3 of the first embodiment. The other end of each of the poles 52 is formed with a pole piece 53 having a first side edge 531 and a second side edge 532 opposite to the first side edge 531. A magnetic pole surface 533 is formed between the second side edge 532, and an air gap (G) is formed between the magnetic pole surface 533 and the magnetic sensitive surface 211.

More specifically, the claw pole piece 5 of the second embodiment differs from the claw pole piece 3 of the first embodiment only in that, as shown in Fig. 10, the claw pole piece 5 defines an axial direction extending from the pole face 533. a reference line (L), and the claw pole piece 5 further defines a reference plane (P) passing through a central axis of the loop portion 51 and a central axis of the pole 52, the reference line (L) being located On the reference surface (P), the reference line (L) can divide the magnetic pole surface 533 into a first magnetic pole surface 533a and a second magnetic pole surface 533b. The first magnetic pole surface 533a is located at the first side edge 531 and the Between the reference lines (L), the second magnetic pole surface 533b is located between the second side edge 532 and the reference line (L), wherein the area of the first magnetic pole surface 533a is different from the area of the second magnetic pole surface 533b. . For example, in the axial direction of the claw pole piece 5, the pole piece 53 is formed on the second side edge 532 to form a peripheral edge 54. The cutting edge 54 formed by the second side edge 532 is designed. The area of the first magnetic pole surface 533a is larger than the area of the second magnetic pole surface 533b. In addition, if the magnetic pole surface 533 forms a chamfer (not shown) or other embodiments that can also make the area of the first magnetic pole surface 533a asymmetrical with the area of the second magnetic pole surface 533b, the invention should still be covered by the present invention. in.

The main feature of the inner rotor type motor according to the second embodiment of the present invention is that, when the coil assembly 4 is energized, the area of the first magnetic pole surface 533a of the claw pole piece 3 is different from the second The magnetic pole surface 533b has an asymmetric design. Therefore, the magnetic resistance of the pole piece 53 adjacent to the first side edge 531 and the second side edge 532 is also asymmetric, so that the same as the first embodiment can be achieved. The start biasing effect makes the inner rotor type motor of the present invention have an effect of being easy to start and preventing the start dead point.

Referring to FIG. 11, a claw pole member 6 according to a third embodiment of the present invention is disclosed. The claw pole member 6 can also be combined with the outer casing 1, the rotating shaft 2 and the coil assembly 4 of the first and second embodiments. The inner rotor type motor of the present invention is constructed.

The claw pole piece 6 of the third embodiment of the present invention has the same loop portion 61, inner ring surface 611, pole post 62, first winding space 621, and the claw pole pieces 3, 5 of the first and second embodiments. The second winding space 622 and the like have a structural feature. Further, the other end of each of the poles 62 defines a pole piece 63. The pole piece 63 has a first side edge 631 and a second side edge 632. A magnetic pole surface 633 is formed between the first side edge 631 and the second side edge 632.

More specifically, the claw pole piece 6 of the third embodiment differs from the claw pole pieces 3, 5 of the first and second embodiments in that the claw pole piece 6 is simultaneously combined with the claws of the first and second embodiments. The structural features of the pole pieces 3, 5 are mainly on the radial section of the pole piece 63 of the claw pole piece 6, forming an enlarged diameter portion 63a adjacent to the first side edge 631, and adjacent to the second side. a reduced diameter portion 63b of the edge 632; and a second side edge 632 of the pole piece 63 is formed with all the sides 64; thereby, since the claw pole piece 6 of the embodiment is combined with the first and second embodiments at the same time The structural features of the claw pole pieces 3, 5, therefore, the inner rotor type motor of the present embodiment can provide better ease of starting and preventing the start of dead spots.

The inner rotor type motor of the present invention can be further applied to a heat dissipation fan structure. For example, as shown in FIG. 12, the rotating shaft 2 is exposed at one end of the outer casing 1 and can be combined with a blade 71 to form a cooling fan; or, as shown in FIG. 13, the rotating shaft 2 is exposed. A fan 72 can be coupled to one end of the outer casing 1 , and the outer casing 1 can be externally connected with a frame 74 by a plurality of connecting members 73 (such as ribs or vanes) to form an air inlet 741 and an air outlet. 742 cooling fan. Thereby, the cooling fan can be installed on various electronic devices or electronic instruments to achieve a predetermined heat dissipation effect.

In summary, the inner rotor type motor of the present invention is designed by the claw pole pieces 3, 5, and 6 of the embodiments, and can be used to solve the problem that the inner inner rotor type motor has poor start control and cannot prevent the start dead point. The problem is to improve the operating efficiency of the inner rotor type motor.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

[this invention]

1. . . shell

11. . . case

111. . . perforation

112. . . Opening

12. . . Closure

13. . . Bearing

2. . . Rotating shaft

twenty one. . . permanent magnet

211. . . Magnetic surface

3. . . Claw pole piece

31. . . Ring section

311. . . Inner annulus

32. . . Pole

321. . . First winding space

322. . . Second winding space

33. . . Pole piece

33a. . . Expansion section

33b. . . Reduced diameter

331. . . First side edge

332. . . Second side edge

333. . . Magnetic pole face

34. . . Missing angle

35. . . Convex

36. . . Insulating sleeve

4. . . Coil set

5. . . Claw pole piece

51. . . Ring section

511. . . Inner annulus

52. . . Pole

521. . . First winding space

522. . . Second winding space

53. . . Pole piece

531. . . First side edge

532. . . Second side edge

533. . . Magnetic pole face

533a. . . First pole face

533b. . . Second magnetic pole face

54. . . Trimming

6. . . Claw pole piece

61. . . Ring section

611. . . Inner annulus

62. . . Pole

621. . . First winding space

622. . . Second winding space

63. . . Pole piece

63a. . . Expansion section

63b. . . Reduced diameter

631. . . First side edge

632. . . Second side edge

633. . . Magnetic pole face

64. . . Missing angle

71. . . Fan blade

72. . . Fan wheel

73. . . Connector

74. . . Fan frame

741. . . Air inlet

742. . . Air outlet

[知知]

8. . . Outer rotor motor

81. . . Pedestal

811. . . Shaft tube

82. . . stator

821. . . Claw pole piece

822. . . Coil set

83. . . Rotor

9. . . Inner rotor motor

91. . . case

911. . . First housing

912. . . Second housing

913. . . Bearing

92. . . Stator structure

921. . . Magnetic component

93. . . Rotor structure

931. . . Rotating shaft

932. . . Magnetic component

94. . . Drive unit

95. . . impeller

Figure 1: An exploded perspective view of a conventional outer rotor motor.

Figure 2: A cross-sectional view of a combination of a conventional inner rotor type motor.

Fig. 3 is an exploded perspective view showing the inner rotor type motor of the first embodiment of the present invention.

Fig. 4 is a sectional view showing the combination of the inner rotor type motor of the first embodiment of the present invention.

Fig. 5 is a partial sectional view showing the inner rotor type motor of the first embodiment of the present invention.

Fig. 6 is a partial sectional view showing another embodiment of the claw pole piece of the inner rotor type motor according to the first embodiment of the present invention.

Fig. 7 is a partial sectional view showing still another embodiment of the claw pole piece of the inner rotor type motor according to the first embodiment of the present invention.

Fig. 8 is an exploded perspective view showing the inner rotor type motor of the second embodiment of the present invention.

Fig. 9 is a sectional view showing the combination of the inner rotor type motor of the second embodiment of the present invention.

Fig. 10 is a perspective view showing the claw pole piece of the inner rotor type motor of the second embodiment of the present invention.

Figure 11 is a perspective view showing the claw pole piece of the inner rotor type motor of the third embodiment of the present invention.

Fig. 12 is a reference view showing the state of use of the inner rotor type motor in combination with the fan blades of the present invention.

Fig. 13 is a view showing the state of use of the inner rotor type motor in combination with the fan wheel of the present invention.

1. . . shell

11. . . case

111. . . perforation

112. . . Opening

12. . . Closure

13. . . Bearing

2. . . Rotating shaft

twenty one. . . permanent magnet

211. . . Magnetic surface

3. . . Claw pole piece

31. . . Ring section

311. . . Inner annulus

32. . . Pole

321. . . First winding space

322. . . Second winding space

33. . . Pole piece

331. . . First side edge

332. . . Second side edge

333. . . Magnetic pole face

36. . . Insulating sleeve

Claims (20)

An inner rotor type motor comprising: a casing; a rotating shaft rotatably coupled to the outer casing, the rotating shaft combining a permanent magnet having a magnetic sensitive surface, the permanent magnet being located inside the outer casing; and a claw pole member coupled to Inside the casing, the claw pole member has a loop portion, the loop portion has an inner annular surface, and the inner annular surface is provided with a plurality of poles, one end of each pole is coupled to the inner annular surface, and the other end is coupled to a pole a first side edge and a second side edge respectively formed by the first side edge and the second side edge, wherein the magnetic pole surface is formed between the first side edge and the second side edge An electromagnetic gap is formed between the magnetic pole surface and the magnetic sensitive surface, and the pole piece respectively forms an enlarged diameter portion adjacent to the first side edge and a contraction adjacent to the second side edge a diameter portion to form the air gaps at unequal intervals; and a coil assembly coupled to the poles of the claw pole members. The inner rotor type motor according to claim 1, wherein the radial cross-sectional area of the pole piece is gradually decreased from the first side edge toward the second side edge. The inner rotor type motor according to claim 1, wherein the pole piece of the claw pole piece forms a notch at the second side edge. The inner rotor type motor according to claim 1, wherein the magnetic pole face of the claw pole piece forms a convex portion adjacent to the first side edge. The inner rotor type motor according to claim 1, 2, 3 or 4, wherein the opposite sides of the pole pole of the claw pole piece form a first winding space and a second winding space, In the radial direction of the claw pole member, the first winding space is at a distance from the inner annular surface of the ring portion to the pole piece, and the second winding space is in the inner ring surface of the ring portion to the pole piece The distance is the same. The inner rotor type motor of claim 1, 2, 3 or 4, wherein the claw pole piece defines a reference line extending axially from the pole face and defining a central axis passing through the ring portion and a reference plane of the central axis of the pole, the reference line is located on the reference plane, the reference line divides the pole face into a first pole face and a second pole face, the first pole face is located at the first Between the one side edge and the reference line, the second magnetic pole surface is located between the second side edge and the reference line, and the area of the first magnetic pole surface is different from the area of the second magnetic pole surface. An inner rotor type motor according to claim 5, wherein the claw pole piece defines a reference line extending axially from the pole face, and defining a central axis passing through the ring portion and a central axis of the pole a reference plane, the reference line is located on the reference plane, the reference line divides the pole face into a first pole face and a second pole face, the first pole face is located at the first side edge and the reference Between the lines, the second magnetic pole surface is located between the second side edge and the reference line, and the area of the first magnetic pole surface is different from the area of the second magnetic pole surface. The inner rotor type motor according to claim 1, 2, 3 or 4, wherein the outer casing is composed of a casing and a closing member, and the opposite ends of the casing respectively form a perforation and an opening The sealing member is coupled to the opening, and at least one bearing is disposed inside the housing, and the rotating shaft extends through the through hole to be coupled to the at least one bearing. An inner rotor type motor comprising: a casing; a rotating shaft rotatably coupled to the outer casing, the rotating shaft combining a permanent magnet having a magnetic sensitive surface, the permanent magnet being located inside the outer casing; and a claw pole member coupled to Inside the casing, the claw pole member has a loop portion, the loop portion has an inner annular surface, and the inner annular surface is provided with a plurality of poles, one end of each pole is coupled to the inner annular surface, and the other end is coupled to a pole a first side edge and a second side edge respectively formed by the first side edge and the second side edge, wherein the magnetic pole surface is formed between the first side edge and the second side edge An electromagnetic gap is formed between the magnetic pole face and the magnetic sensitive surface, the claw pole piece defining a reference line extending axially from the magnetic pole face, and defining a central axis passing through the loop portion And a reference surface of the central axis of the pole, the reference line is located on the reference surface, the reference line is divided into a first magnetic pole surface and a second magnetic pole surface, wherein the first magnetic pole surface is located The second magnetic pole between the first side edge and the reference line Located between the second side edge, and the reference line, the area of the first magnetic pole surface of the magnetic pole surface of a different area of the second; and a coil assembly, in conjunction with the pole of the claw pole member. The inner rotor type motor according to claim 9, wherein the pole piece forms an edge on the second side edge or forms a chamfer angle on the pole face such that the area of the first pole face is larger than the second The area of the magnetic pole face. The inner rotor type motor according to claim 9 or 10, wherein the opposite sides of the pole pole of the claw pole piece form a first winding space and a second winding space, and the claw pole piece In the radial direction, the distance from the inner annular surface of the first winding space to the pole piece is the same as the distance from the inner annular surface of the second winding space to the pole piece. The inner rotor type motor according to claim 9 or 10, wherein the outer casing is composed of a casing and a closing member, and the opposite ends of the casing respectively form a perforation and an opening, the closing member Incorporating the opening, at least one bearing is disposed inside the housing, and the rotating shaft extends through the through hole to be coupled to the at least one bearing. A claw pole member of an inner rotor type motor, comprising: a ring portion having an inner annular surface and a plurality of poles, one end connecting the inner annular surface and the other end extending radially toward a center of the annular portion; And a first side edge and a second side edge, the first side edge and the second side are respectively opposite ends of the pole piece A pole face is formed between the edges, and the pole pieces respectively form an enlarged diameter portion adjacent to the first side edge and a reduced diameter portion adjacent to the second side edge. The claw pole piece of the inner rotor type motor according to claim 13 , wherein the opposite sides of the pole pole of the claw pole piece form a first winding space and a second winding space, in the claw In the radial direction of the pole piece, the distance between the inner ring surface of the first winding space and the pole piece of the ring portion is the distance from the inner ring surface of the second winding space to the pole piece to the pole piece the same. The claw pole piece of the inner rotor type motor according to claim 13 or 14, wherein the radial cross-sectional area of the pole piece is gradually decreased from the first side edge toward the second side edge. The claw pole piece of the inner rotor type motor according to claim 13 or 14, wherein the pole piece of the claw pole piece forms a notch at the second side edge. The claw pole piece of the inner rotor type motor according to claim 13 or 14, wherein the pole face of the claw pole piece forms a convex portion adjacent to the first side edge. A claw pole member of an inner rotor type motor, comprising: a ring portion having an inner annular surface and a plurality of poles, one end connecting the inner annular surface and the other end extending radially toward a center of the annular portion; and a plurality of poles The first side edge and the second side edge of the first side edge and the second side edge are respectively opposite to the other side of the pole piece. Forming a magnetic pole face; wherein the claw pole piece defines a reference line extending axially from the pole face, and a reference plane defining a central axis of the ring portion and a central axis of the pole, the reference line Located on the reference surface, the reference line divides the magnetic pole surface into a first magnetic pole surface and a second magnetic pole surface, the first magnetic pole surface is located between the first side edge and the reference line, and the second magnetic pole surface Located between the second side edge and the reference line, an area of the first magnetic pole surface is different from an area of the second magnetic pole surface. The claw pole piece of the inner rotor type motor according to claim 18, wherein the pole piece forms an edge on the second side edge or forms a chamfer angle on the pole surface to make the area of the first pole face It is larger than the area of the second magnetic pole face. The claw pole piece of the inner rotor type motor according to the above-mentioned patent scopes 18 and 19, wherein the opposite side of the pole pole of the claw pole piece forms a first winding space and a second winding space, In the radial direction of the claw pole piece, the distance of the first winding space from the inner annular surface of the ring portion to the pole piece and the inner winding surface of the second winding space from the inner ring surface of the ring portion to the pole piece The distance is the same.