CN103427508B - A kind of segmental skew notch concentratred winding motor, electromotor and motor - Google Patents

Abstract

The invention relates to a segmented slanted notch centralized winding motor, a generator and a motor. The rotor yoke of the segmented slanted slot concentrated winding motor is pasted with 2P blocks of N and S magnets with a spacing of Sm and distributed alternately. The stator core is provided with Z slots and Z stator teeth. The slot width Sc between two adjacent stator teeth of the concentrated winding motor and the distance Sm between two adjacent magnetic steels satisfy: Sm/Sc=( 0.83～1.3); the ratio of the width τm of the magnetic steel to the pole pitch τ satisfies: τm/τ≥(0.75～0.9); the stator core is a straight slot, and the position of the slot of the stator core is symmetrical along the axial direction of the stator core The ground segment is offset by a certain mechanical angle. The present invention utilizes the numerical optimization of the gap between the magnetic steel and the notch to increase the frequency of the positioning torque and suppress the amplitude of the positioning torque. Line requirements, more convenient for production.

Description

Concentrated winding motor, generator and motor with sectioned oblique slots

technical field

The invention relates to a permanent magnet motor with concentrated winding, in particular to a segmented oblique slot concentrated winding motor, generator and motor.

Background technique

The rotors of permanent magnet motors generally use rare earth permanent magnets, such as NdFeB permanent magnets. Rare earth permanent magnet materials are becoming scarcer and more expensive, so it is necessary to reduce the amount of permanent magnets and improve the utilization rate of permanent magnets.

Permanent magnet motors with concentrated windings can significantly improve the power and energy indicators of permanent magnet motors, such as: winding utilization, efficiency, power volume ratio, torque volume ratio, etc., and improve the motor manufacturing process.

However, the excessively large cogging torque is still a problem for concentrated winding permanent magnet motors. The optimal number of magnetic poles and cogging slots can suppress the cogging torque, so that there are very few options for concentrated winding permanent magnet motors. Invention patent ZL200780009121.0 proposes a stator structure with large, medium and small teeth to suppress the positioning torque; ZL200920204762.8 proposes a combination of the number of magnetic poles and the number of large and small teeth to suppress the positioning torque; The stator punching must adopt a piece structure, and after the pieces are wound, they are assembled into a stator body, or the small teeth are removed and then wound, and then the small teeth are assembled. None of these methods can realize direct automatic winding, which increases the risk of process cost and process error.

Compared with the permanent magnet motor with traditional distributed winding, the permanent magnet motor with concentrated winding has at least 3 times fewer slots in the stator, that is, the permanent magnet motor with concentrated winding has fewer slots and a larger slot distance, which can simplify the motor manufacturing process , but it also makes the concentrated winding permanent magnet motor lose the possibility of effectively suppressing the positioning torque by using one inclined slot pitch, because the mechanical angle and electrical angle of the concentrated winding permanent magnet motor inclined one slot pitch are too large. Therefore, the most effective measure for the traditional distributed winding permanent magnet motor to suppress the positioning torque, the concentrated winding permanent magnet motor cannot be used, and the excessive positioning torque of the concentrated winding permanent magnet motor is still a big problem.

Contents of the invention

In view of this, the present invention provides a segmented oblique notch concentrated winding motor, generator and motor, which uses inter-attached magnetic steel, which saves materials, and uses the numerical optimization of the magnetic steel gap and slot gap to improve positioning. Torque frequency, suppression of positioning torque amplitude, good sine of the air gap magnetic field, small positioning torque of the motor, and the notch of the motor can fully meet the requirements of direct automatic winding, which is more convenient for production.

The present invention provides a segmented slanted notch centralized winding motor, the rotor yoke is pasted with 2P pieces of magnetic steel with N and S polarities distributed alternately at a distance of Sm, and the stator core is provided with Z slots and Z stator teeth. , the size of the notch width Sc between two adjacent stator teeth of the concentrated winding motor and the spacing Sm of two adjacent magnetic steels satisfies the constraint relationship: Sm/Sc=(0.83～1.3); the magnetic The ratio of steel width τm to pole pitch τ satisfies the constraint relationship: τm/τ≥(0.75～0.9), where pole pitch τ=360°/2P, P is the number of magnetic pole pairs of the motor; the stator core is straight slot, and the position of the notch of the stator core is axially and symmetrically offset by a certain mechanical angle along the axis of the stator core, the total offset angle is kTσ, where Tσ=360/(2P×Z/c), c is the greatest common divisor of 2P and Z, and the value range of k is K=(1-10).

According to the concentrated winding motor with sectional oblique slots of the present invention, the concentrated winding motor is an inner rotor motor or an outer rotor motor.

According to the segmented oblique notch concentrated winding motor of the present invention, the stator core is divided into N sections, the position of the slot of each stator core is offset by an angle of kTσ/N, and the total offset angle of the N sections is kTσ.

According to the segmented oblique notch centralized winding motor of the present invention, the stator core is divided into three sections, the position of the slot of each stator core is offset by an angle of kTσ/3, and the total offset angle of the three sections is kTσ.

According to the segmented oblique notch centralized winding motor of the present invention, the stator core is divided into two sections, the position of the slot of each stator core is offset by an angle of kTσ/2, and the total offset angle of the two sections is kTσ.

According to the segmented slanted notch centralized winding motor of the present invention, the number of motor poles 2P=10, the number of slots Z=12, the stator core is divided into three sections, and the position of the slot of each stator core is offset by an angle of kTσ/3 , the total offset angle of the three sections is kTσ, where Tσ=360/(2P×Z/c)=360/(10×12/2)=6, and k=1.

According to the segmented oblique notch centralized winding motor of the present invention, the number of motor poles 2P=10, the number of slots Z=12, the slot width Sc=3.5mm, the distance between two adjacent magnetic steels Sm=3.2mm, Sm/Sc = 0.914.

According to the segmented oblique slot concentrated winding motor of the present invention, the stator core is formed by laminating multiple layers of stator punches, and each section of the stator core is formed by laminating stator punches of the same structure. The stator punch includes a ring-shaped stator yoke and Z stator teeth integrally formed with the stator yoke, and Z slots are formed between the Z stator teeth.

According to the segmented oblique slot concentrated winding motor of the present invention, each stator punching piece is divided into Z blocks with the same structure by the center position of the corresponding slot of the stator yoke, and there are interlocking concave-convex structures between adjacent two blocks .

According to the segmented oblique slot concentrated winding motor of the present invention, the block includes a base forming the stator yoke and a tooth forming the stator teeth, at least one groove is provided at one end of the base, and at least one groove is provided at the other end of the base. There is at least one protrusion, and the grooves and protrusions of adjacent blocks are engaged with each other.

According to the motor with segmented inclined slots and concentrated windings of the present invention, the shapes of the protrusions and the grooves are arc-shaped or trapezoidal.

The present invention also provides a generator, the rotor yoke is affixed with 2P blocks of magnetic steel with N and S polarities distributed alternately at a distance of Sm, and the stator core is provided with Z slots and Z stator teeth. The size of the slot width Sc between two adjacent stator teeth and the spacing Sm of two adjacent magnetic steels satisfies the constraint relationship: Sm/Sc=(0.83～1.3); the width τm of the magnetic steel is related to the pole The ratio of the distance τ satisfies the constraint relation: τm/τ≥(0.75～0.9), wherein the pole distance τ=360°/2P, P is the number of magnetic pole pairs of the motor; the stator core is a straight slot, and the stator The position of the notch of the iron core is axially and symmetrically offset by a certain mechanical angle along the axial direction of the stator core, and the total offset angle is kTσ, where Tσ=360/(2P×Z/c), and c is the relationship between 2P and Z For the greatest common divisor, the value range of k is K=(1-10).

The present invention also provides a motor, the rotor yoke is pasted with 2P pieces of magnetic steel with N and S polarities distributed alternately at a distance of Sm, the stator iron core is provided with Z slots and Z stator teeth, and the two parts of the motor The size of the slot width Sc between two adjacent stator teeth and the spacing Sm of two adjacent magnetic steels satisfies the constraint relationship: Sm/Sc=(0.83～1.3); the width τm of the magnetic steel and the pole pitch τ The ratio meets the constraint relationship: τm/τ≥(0.75～0.9), where the pole pitch τ=360°/2P, P is the number of magnetic pole pairs of the motor; the stator core is a straight slot, and the stator core The position of the notch is axially and symmetrically offset by a certain mechanical angle along the axial direction of the stator core, and the total offset angle is kTσ, where Tσ=360/(2P×Z/c), and c is the maximum convention between 2P and Z The value range of k is K=(1～10).

The segmented slanted notch centralized winding motor of the present invention adopts the inter-attached magnetic steel to save the magnetic steel. The size of the slot width Sc between the two teeth of the concentrated winding motor stator and the distance Sm between two adjacent magnetic steels meets the requirements Constraint relationship: Sm/Sc=(0.83～1.3), which is different from the design concept of traditional permanent magnet motors. Traditional permanent magnet motor design believes that the smaller the slot width Sc and the spacing Sm of the magnetic steel, the smaller the positioning torque. The present invention doubles the frequency of positioning torque by strengthening and utilizing the sudden change of the magnetic field intensity at the two edges of the magnetic steel spacing and the sudden change of the magnetic resistance at the two edges of the notch. Generally speaking, when the harmonic frequency is doubled, the harmonic amplitude is at least doubled. Therefore, the present invention increases the frequency of the positioning torque and can suppress the amplitude of the positioning torque.

The notch width Sc of the motor of the present invention can be given by artificial design, so that the notch of the motor can fully meet the requirement of direct automatic winding. The ratio of the width τm of the magnetic steel to the pole pitch τ satisfies the constraint relationship: τm/τ≥(0.75～0.9), where the pole pitch τ=360°/2P, P is the number of magnetic pole pairs of the motor, so that the magnetic pole of the motor can be selected The amount of steel used optimizes the sinusoidality of the magnetic field of the concentrated winding motor and keeps the torque constant.

The stator iron core of the present invention is a straight slot, and the position of the slot of the stator iron core is axially symmetrically offset by a certain mechanical angle along the axial direction of the iron core, and the total offset angle is kTσ, where Tσ=360/(2P×Z/ c), c is the greatest common divisor of 2P and Z, and the value range of k is K=(1-10). Generally speaking, the larger the value of k, the more obvious the effect of homogenizing the notch by notch offset, that is, the more obvious the effect of homogenizing the positioning moment. Therefore, the positioning torque can be multiplied by frequency, and then the notch can be shifted, which is equivalent to doubling the value of k. The ideal effect of suppressing the positioning torque can be achieved by making the notch deviation of the concentrated winding motor small.

At the same time, the present invention adopts the stator core in the form of straight slots and inclined slots to facilitate automatic winding, and the slots are offset in sections. The structure of the stator punching plate only needs several different forms, which is more convenient for production and reduces costs. In this way, the present invention adopts the inter-attached magnetic steel, which saves materials, and uses the numerical optimization of the gap between the magnetic steel and the notch to increase the frequency of the positioning torque, suppress the amplitude of the positioning torque, and the sine of the air gap magnetic field is good, and the positioning of the motor The torque is small, and the slot of the motor can fully meet the requirements of direct automatic winding, and at the same time, it is convenient for production.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a partial schematic diagram of the stator punching and the rotor of an embodiment of the segmented oblique notch concentrated winding motor of the present invention;

Fig. 2 is a partially expanded schematic diagram of the notch offset of the motor with segmented oblique notch centralized winding in Fig. 1 by 0.25 stator slot pitch;

Fig. 3 is a three-dimensional view of the stator of another embodiment of the segmented oblique slot concentrated winding motor of the present invention;

Fig. 4 is a three-dimensional view of the stator of another embodiment of the concentrated winding motor with segmented oblique slots of the present invention;

Figure 5 is a front view of the stator in Figure 4; and

Fig. 6 is a schematic diagram of stator stamping of the stator in Fig. 4 .

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

As shown in Fig. 1, the present invention is a kind of motor 100 with concentrated winding of segmental chute opening. The rotor yoke 10 is pasted with 2P pieces of magnetic steel 20 with N and S polarities distributed alternately at a distance of Sm, that is, the motor has 2P The stator core 30 is provided with Z slots 31 and Z stator teeth 32. According to traditional theoretical analysis and experiments, the period of the positioning torque of the permanent magnet motor with the number of poles and slots is: Tσ=360/(2P×Z/c), where c is the greatest common divisor of 2P and Z. The segmented inclined slot concentrated winding motor 100 can be used as a high-performance servo motor, torque motor, electric vehicle motor and direct drive wind power generator, and the segmented inclined slot concentrated winding motor 100 can be an inner rotor motor or an outer rotor motor .

Wherein, the size of the slot width Sc between two adjacent stator teeth 32 of the subsection oblique slot concentrated winding motor 100 and the spacing Sm of two adjacent magnetic steels 20 satisfies the constraint relationship: Sm/Sc=(0.83 ~1.3). This is different from the design concept of traditional permanent magnet motors, which believe that the smaller the notch width Sc and the spacing Sm of the magnetic steel, the smaller the positioning torque. The present invention doubles the frequency of positioning torque by strengthening and utilizing the sudden change of the magnetic field intensity at the two edges of the magnetic steel spacing and the sudden change of the magnetic resistance at the two edges of the notch. Generally speaking, when the harmonic frequency is doubled, the harmonic amplitude is at least doubled. Therefore, the present invention increases the frequency of the detent moment and can suppress the amplitude of the detent moment. At the same time, the notch width Sc of the motor can be given by artificial design, so that the notch of the motor can fully meet the requirements of direct automatic winding.

The ratio of the width τm of the magnetic steel 20 to the pole pitch τ satisfies the constraint relation: τm/τ≥(0.75-0.9), where the pole pitch τ=360°/2P, and P is the number of magnetic pole pairs of the motor. Therefore, the amount of magnetic steel used in the motor can be selected, and at the same time, the sinusoidality of the magnetic field of the concentrated winding motor can be optimized, and the torque can be kept constant. Therefore, the concentrated winding motor designed according to the above two constraints has good sinusoidal air-gap magnetic field, and the positioning torque of the motor is relatively small.

As shown in Fig. 2 and Fig. 3, the stator core 30 is a straight slot, and the position of the notch of the stator core 30 is offset by a certain mechanical angle symmetrically along the axial direction of the iron core, and the total offset angle is kTσ, where Tσ =360/(2P×Z/c), c is the greatest common divisor of 2P and Z, and the value range of k is K=(1～10). Generally speaking, the larger the value of k, the more obvious the effect of homogenizing the notch by notch offset, that is, the more obvious the effect of homogenizing the positioning moment. Therefore, the positioning torque can be multiplied by frequency, and then the notch can be shifted, which is equivalent to doubling the value of k. The ideal effect of suppressing the positioning torque can be achieved by making the notch deviation of the concentrated winding motor small. As shown in Figure 2, when K=1 in the present invention, the actual notch offset D is about 0.25 stator slot pitch, and the effect of suppressing the positioning moment is very obvious. However, the 0.25 slot pitch of the traditional concentrated winding motor chute has very limited effect on restraining the positioning torque, and the 1.0 slot pitch of the chute is not feasible at all.

At the same time, the stator core 30 in the form of straight slots and inclined slots is convenient for automatic winding, and the slots are offset in sections. The structure of the stator punching plate only needs several different forms, which is more convenient for production and reduces costs. In this way, the present invention adopts the inter-attached magnetic steel, which saves materials, and uses the numerical optimization of the gap between the magnetic steel and the notch to increase the frequency of the positioning torque, suppress the amplitude of the positioning torque, and the sine of the air gap magnetic field is good, and the positioning of the motor The torque is small, and the slot of the motor can fully meet the requirements of direct automatic winding, and at the same time, it is convenient for production.

Specifically, the stator core 30 is divided into N sections, and the slot position of each section is fixedly offset by an angle of kTσ/N, and the total offset angle of the N sections is kTσ. For example: the stator core 30 can be divided into three sections, the notch position of each section is offset by an angle of kTσ/3, and the total offset angle of the three sections is kTσ, as shown in Figures 2 to 4; or the stator core 20 is divided into two segment, the notch position of each segment is offset by kTσ/2 angle, and the total offset angle of the two segments is kTσ.

As shown in FIG. 1 , the rotor yoke 10 of the concentrated winding motor 100 is pasted with 10 pieces of magnetic steel 20 with N and S polarities distributed alternately, and the stator core 30 is provided with 12 slots and 12 stator teeth. As shown in Figure 2, the stator core 30 is divided into three sections, and the notch position of each section is offset by an angle of kTσ/3, the total offset angle of the three sections is kTσ, Tσ=360/(2P×Z/c)=360/ (10×12/2)=6, take k=1, that is, the notch offset D is 6 degrees. Among them, Sc represents the notch width, D represents the notch offset, U represents the tooth width, and V represents the pitch of adjacent teeth. Preferably, the notch width Sc=3.5mm, the distance between two adjacent magnetic steels 20 is Sm=3.2mm, and Sm/Sc=0.914.

Referring to FIG. 3 and FIG. 4 , it illustrates two embodiments of different structures of the stator core 30 . In Fig. 3, the stator core 30 is formed by stacking multi-layer stator punches 33, and the stator core 30 is divided into three sections, and each section of the stator core is formed by stacking stator punches 33 of the same structure, and the stator punches The sheet 33 includes an annular stator yoke 331 and Z stator teeth 32 integrally formed with the stator yoke 331 , and Z slots 31 are formed between the Z stator teeth 32 . Each segment of the stator core is formed by stacking stator punches 33 of the same structure. Compared with the straight groove and oblique notch structure that does not use segments, the number of stator punch dies can be reduced to achieve the same effect of reducing positioning torque. , which is more convenient for production.

In the embodiment shown in FIG. 4 , different from that in FIG. 3 , each stator punch 33 is spliced by Z pieces 34 with the same structure divided by the central position of the stator yoke 331 corresponding to the groove 31, and is spliced together. Between two adjacent sub-blocks 34 there is an interlocking concave-convex structure. Each stator punching piece 33 is spliced by Z blocks 34 with the same structure, and the waste generated by punching the block 34 is less than that generated by directly stamping the entire stator punching piece 33 , which saves costs.

FIG. 5 is a front view of the stator core 30 in FIG. 4 ; FIG. 6 is a schematic diagram of the specific structure of the stator punching 33 in FIG. 4 . As can be seen from Figures 5 and 6, the block 34 includes a base 341 forming the stator yoke 331 and a tooth 342 forming the stator teeth 32, one end of the base 341 is provided with at least one groove 3411, and the other end of the base 341 is provided with at least one The protruding block 3412 , the groove 3411 of the adjacent segment 34 and the protruding block 3412 are engaged with each other. Preferably, the shape of the protrusion 3412 and the groove 3411 is an arc or a trapezoid, and of course other shapes are also possible.

The present invention also provides a generator, the rotor yoke is affixed with 2P pieces of magnetic steel with N and S polarities distributed alternately at a distance of Sm, and the stator iron core is provided with Z slots and Z stator teeth. The size of the notch width Sc between two adjacent stator teeth and the spacing Sm of two adjacent magnetic steels satisfies the constraint relationship: Sm/Sc=(0.83～1.3); the width τm of the magnetic steel and the pole pitch τ Ratio, satisfying the constraint relationship: τm/τ≥(0.75～0.9), where the pole pitch τ=360°/2P, P is the number of magnetic pole pairs of the motor; the stator core is a straight slot, and the slot of the stator core The position is axially and symmetrically offset by a certain mechanical angle along the iron core, and the total offset angle is kTσ, where Tσ=360/(2P×Z/c), c is the greatest common divisor of 2P and Z, and the value of k The range is K=(1～10).

The present invention also provides a motor, the rotor yoke is pasted with 2P magnetic steels with N and S polarities distributed alternately at a distance of Sm, and the stator iron core is provided with Z slots and Z stator teeth. The size of the slot width Sc between adjacent stator teeth and the spacing Sm of two adjacent magnetic steels satisfies the constraint relationship: Sm/Sc=(0.83～1.3); the ratio of the width τm of the magnetic steel to the pole pitch τ, Satisfy the constraint relationship: τm/τ≥(0.75～0.9), where the pole pitch τ=360°/2P, P is the number of magnetic pole pairs of the motor; the stator core is a straight slot, and the position of the slot of the stator core The iron core is axially and symmetrically offset by a certain mechanical angle in sections, and the total offset angle is kTσ, where Tσ=360/(2P×Z/c), c is the greatest common divisor of 2P and Z, and the value range of k It is K=(1～10).

In summary, the concentrated winding motor of the present invention adopts the inter-attached magnetic steel to save the magnetic steel, and the notch width Sc between the two teeth of the concentrated winding motor stator and the distance Sm between two adjacent magnetic steels meet the requirements of Constraint relationship: Sm/Sc=(0.83～1.3), which is different from the design concept of traditional permanent magnet motors. Traditional permanent magnet motor design believes that the smaller the slot width Sc and the spacing Sm of the magnetic steel, the smaller the positioning torque. The present invention doubles the frequency of positioning torque by strengthening and utilizing the sudden change of the magnetic field intensity at the two edges of the magnetic steel spacing and the sudden change of the magnetic resistance at the two edges of the notch. Generally speaking, when the harmonic frequency is doubled, the harmonic amplitude is at least doubled. Therefore, the present invention increases the frequency of the positioning torque and can suppress the amplitude of the positioning torque. At the same time, the notch width Sc of the motor can be given by artificial design, so that the notch of the motor can fully meet the requirements of direct automatic winding. The ratio of the width τm of the magnetic steel to the pole pitch τ satisfies the constraint relationship: τm/τ≥(0.75～0.9), where the pole pitch τ=360°/2P, P is the number of magnetic pole pairs of the motor, so that the magnetic pole of the motor can be selected The amount of steel used optimizes the sinusoidality of the magnetic field of the concentrated winding motor and keeps the torque constant. The stator core is a straight slot, and the position of the notch of the stator core is offset by a certain mechanical angle symmetrically along the axial direction of the iron core, and the total offset angle is kTσ, where Tσ=360/(2P×Z/c ), c is the greatest common divisor of 2P and Z, and the value range of k is K=(1～10). Generally speaking, the larger the value of k, the more obvious the effect of homogenizing the notch by notch offset, that is, the more obvious the effect of homogenizing the positioning moment. Therefore, the positioning torque can be multiplied by frequency, and then the notch can be shifted, which is equivalent to doubling the value of k. The ideal effect of suppressing the positioning torque can be achieved by making the notch deviation of the concentrated winding motor small. At the same time, the stator core in the form of straight slots and inclined slots is convenient for automatic winding, and the slots are offset in sections. The structure of the stator punching plate only needs several different forms, which is more convenient for production and reduces costs. In this way, the present invention adopts the inter-attached magnetic steel, which saves materials, and uses the numerical optimization of the gap between the magnetic steel and the notch to increase the frequency of the positioning torque, suppress the amplitude of the positioning torque, and the sine of the air gap magnetic field is good, and the positioning of the motor The torque is small, and the slot of the motor can fully meet the requirements of direct automatic winding, and at the same time, it is convenient for production.

In this paper, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; meanwhile, for those of ordinary skill in the art, according to the present invention Thoughts, there will be changes in the specific implementation and application scope. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (12)

1. a segmental skew notch concentratred winding motor, its rotor yoke posts the magnet steel that 2P block N, S polarity that spacing is Sm distributes alternately, and stator core is provided with Z groove and Z stator tooth, it is characterised in that

Width of rebate Sc between two adjacent stators teeth of described concentratred winding motor and the size of interval S m of two blocks of adjacent magnet steel, meet restriction relation: Sm/Sc=(0.83～1.3)；

The ratio of width τ m and the pole span τ of described magnet steel, meets restriction relation: τ m/ τ >=0.75, wherein pole span τ=360 °/2P, P is the magnetic pole logarithm of motor；

Described stator core is straight trough, and the position of described stator core notch prolongs the described stator core axially symmetric ground certain mechanical angle of grading excursion, total drift angle is kT σ, wherein T σ=360/ (2P × Z/c), c is the greatest common divisor of 2P Yu Z, span K=(1～10) of k；

Described stator core is divided into N section, and the notch position skew kT σ/N angle of every section of stator core, N section total drift angle is kT σ.

Segmental skew notch concentratred winding motor the most according to claim 1, it is characterised in that described concentratred winding motor is inner rotor motor or external rotor electric machine.

Segmental skew notch concentratred winding motor the most according to claim 1, it is characterised in that described stator core is divided into three sections, notch position skew kT σ/3 angle of every section of stator core, three sections of total drift angles are kT σ.

Segmental skew notch concentratred winding motor the most according to claim 1, it is characterised in that described stator core is divided into two sections, notch position skew kT σ/2 angle of every section of stator core, two sections of total drift angles are kT σ.

Segmental skew notch concentratred winding motor the most according to claim 3, it is characterized in that, motor pole number 2P=10, groove number Z=12, described stator core is divided into three sections, notch position skew kT σ/3 angle of every section of stator core, and three sections of total drift angles are kT σ, wherein T σ=360/ (2P × Z/c)=360/ (10 × 12/2)=6, take k=1.

Segmental skew notch concentratred winding motor the most according to claim 1, it is characterised in that motor pole number 2P=10, groove number Z=12, width of rebate Sc=3.5mm, interval S m=3.2mm of two blocks of adjacent magnet steel, Sm/Sc=0.914.

Segmental skew notch concentratred winding motor the most according to claim 1, it is characterized in that, described stator core is formed by multi-layer stator punching repeatedly pressure, described every section of stator core is formed by mutually isostructural stator punching repeatedly pressure, described stator punching includes stator yoke ringwise and Z stator tooth integrated with described stator yoke, forms Z groove between described Z stator tooth.

Segmental skew notch concentratred winding motor the most according to claim 7, it is characterised in that the piecemeal that Z structure that each stator punching is divided into by the center of its stator yoke corresponding groove is identical, has between adjacent two piecemeals and is mutually twisted concaveconvex structure.

Segmental skew notch concentratred winding motor the most according to claim 8, it is characterized in that, described piecemeal includes the base portion forming described stator yoke and the teeth portion forming stator tooth, described base portion one end is provided with at least one groove, the described base portion other end is provided with at least one projection, is mutually twisted between groove and the projection of adjacent piecemeal.

Segmental skew notch concentratred winding motor the most according to claim 9, it is characterised in that described projection and described groove be shaped as circular arc or trapezoidal.

11. 1 kinds of electromotors, its rotor yoke posts the magnet steel that 2P block N, S polarity that spacing is Sm distributes alternately, and stator core is provided with Z groove and Z stator tooth, it is characterised in that

Width of rebate Sc between two adjacent stators teeth of described electromotor and the size of interval S m of two blocks of adjacent magnet steel, meet restriction relation: Sm/Sc=(0.83～1.3)；

The ratio of width τ m and the pole span τ of described magnet steel, meets restriction relation: m/ τ >=0.75, wherein pole span τ=360 °/2P, P is the magnetic pole logarithm of described electromotor；

Described stator core is straight trough, and the position of described stator core notch prolongs the described stator core axially symmetric ground certain mechanical angle of grading excursion, total drift angle is kT σ, wherein T σ=360/ (2P × Z/c), c is the greatest common divisor of 2P Yu Z, span K=(1～10) of k；

Described stator core is divided into N section, and the notch position skew kT σ/N angle of every section of stator core, N section total drift angle is kT σ.

12. 1 kinds of motor, its rotor yoke posts the magnet steel that 2P block N, S polarity that spacing is Sm distributes alternately, and stator core is provided with Z groove and Z stator tooth, it is characterised in that

Width of rebate Sc between two adjacent stators teeth of described motor and the size of interval S m of two blocks of adjacent magnet steel, meet restriction relation: Sm/Sc=(0.83～1.3)；

The ratio of width τ m and the pole span τ of described magnet steel, meets restriction relation: m/ τ >=0.75, wherein pole span τ=360 °/2P, P is the magnetic pole logarithm of described motor；

Described stator core is straight trough, and the position of described stator core notch prolongs the described stator core axially symmetric ground certain mechanical angle of grading excursion, total drift angle is kT σ, wherein T σ=360/ (2P × Z/c), c is the greatest common divisor of 2P Yu Z, span K=(1～10) of k

Described stator core is divided into N section, and the notch position skew kT σ/N angle of every section of stator core, N section total drift angle is kT σ.