CN215344119U

CN215344119U - Novel motor iron core structure and range hood with same

Info

Publication number: CN215344119U
Application number: CN202120952753.8U
Authority: CN
Inventors: 莫铭达; 胡洪武; 何朝辉
Original assignee: Jiangmen Lusituo Motor Electric Appliance Co ltd
Current assignee: Jiangmen Lusituo Motor Electric Appliance Co ltd
Priority date: 2021-05-06
Filing date: 2021-05-06
Publication date: 2021-12-28
Anticipated expiration: 2031-05-06

Abstract

The utility model discloses a novel motor iron core structure and a range hood with the same, wherein the novel motor iron core structure comprises: the stator iron chip is circular, a plurality of stator winding slots are formed in the stator iron chip and comprise a stator slot opening and a stator slot bottom, the stator slot bottom is arc-shaped, a separating tooth is arranged between every two adjacent stator winding slots, a limiting block for fixing a coil is arranged at the stator slot opening of the separating tooth, the width of the separating tooth is smaller than that of the stator slot bottom, and a circular through hole is formed by the plurality of limiting blocks in a surrounding mode; the rotor iron core piece is circular shape, and the rotor iron core piece is located circular through-hole, and the rotor iron core piece is equipped with rotor wire winding groove, and rotor wire winding groove opening is towards the stator iron core piece. The utility model provides a novel motor iron core structure and a range hood with the same, which improve the performance of a motor, the production efficiency and the product percent of pass on the premise of not increasing a motor with a thick lamination and greatly increasing the tank fullness.

Description

Novel motor iron core structure and range hood with same

Technical Field

The utility model relates to the technical field of motor equipment, in particular to a novel motor iron core structure and a range hood with the same.

Background

The motor performance of the motor for the range hood in the related art can not meet the customer requirements, is restricted by the structure of the whole machine product, the magnetic flux of the motor in the related art is in a saturated state, when only a winding copper wire is adjusted, the rising space of the motor performance is not large, the efficiency can not meet the customer requirements, the full rate of the slot can be increased too much, the copper wire can not be embedded, the temperature rise of the motor also exceeds the customer requirements, and the production efficiency and the qualification rate of the product have great problems.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a novel motor iron core structure and a range hood with the same, which improve the performance of a motor, the production efficiency and the product percent of pass on the premise of not increasing a motor with a thick lamination and greatly increasing the tank fullness.

In a first aspect, an embodiment of the present invention provides a novel motor core structure, where the novel motor core structure includes: the stator iron core piece is circular, a plurality of stator winding grooves are formed in the stator iron core piece and comprise a stator notch and a stator groove bottom, the stator groove bottom is arc-shaped, spacing teeth are arranged between every two adjacent stator winding grooves, limiting blocks for fixing coils are arranged at the stator notch of each spacing tooth, the width of each spacing tooth is smaller than that of the stator groove bottom, and the limiting blocks surround to form a circular through hole; the rotor iron chip is in a circular shape and is located in the circular through hole, a rotor winding groove is formed in the rotor iron chip, and the opening of the rotor winding groove faces the stator iron chip.

According to the novel motor iron core structure provided by the embodiment of the utility model, the following beneficial effects are at least achieved: be equipped with a plurality of stator wire winding grooves on the stator iron core piece, be equipped with between the adjacent stator wire winding groove and be used for separating the tooth that separates of coil, the width that separates the tooth is little than the width of stator tank bottom, reduces the proportion of tooth width and tank bottom width, improves the effective area in stator wire winding groove, effectively reduces the stator tank fullness rate, avoids the tank fullness rate too high and can't imbed the copper line, temperature when reducing the motor operation. The limiting blocks arranged at the stator slot openings of the separating teeth can limit the installation positions of the coils, and the rotor iron core pieces are arranged in the circular through holes formed by the surrounding of the limiting blocks, so that the coils are prevented from being displaced and damaged due to the contact with the rotor iron core pieces when the rotor runs at a high speed. Through the cell type of adjustment stator wire winding groove, reduce the proportion of separating tooth width and stator tank bottom width to the area of increase stator wire winding groove reduces the full rate in groove of stator, improves the energy efficiency and the fluid power efficiency of motor, reduces the production degree of difficulty when improving the motor performance, improves production efficiency and product percent of pass.

According to some embodiments of the utility model, the plurality of stator iron chips are provided, the stator iron chips are provided with stator connecting structures for connecting other stator iron chips, the stator connecting structures comprise stator clamping grooves and stator clamping teeth which are matched, the stator clamping grooves are located on one side of the stator iron chips, and the stator clamping teeth are located on the other side of the stator iron chips, so that the plurality of stator iron chips are conveniently installed.

According to some embodiments of the utility model, the stator clamping grooves and the stator clamping teeth are respectively provided with a plurality of slots, the stator clamping grooves are distributed in a circular arrangement, and the stator clamping grooves correspond to the stator clamping teeth one by one, so that the connection stability of the stator clamping grooves and the stator clamping teeth is improved.

According to some embodiments of the utility model, the arc diameter of the bottom of the stator slot is 4mm in length, the width of the bottom of the stator slot is 6.5mm to 8mm, and the width of the separating tooth is 3mm to 4mm, so that the area of the stator winding slot is increased.

According to some embodiments of the utility model, the diameter length of the circular through hole is 49 ± 0.05mm, the diameter length of the rotor core piece is 48.65 ± 0.02mm, and the structure is compact, so that the use requirement is met.

According to some embodiments of the utility model, the outer side of the stator core piece is provided with a limiting straight strip for installing the stator core piece, so that the installation stability of the stator core piece is improved.

According to some embodiments of the present invention, the plurality of rotor core pieces are provided, the rotor core pieces are provided with rotor connecting structures for stacking connection with other rotor core pieces, the rotor connecting structures include rotor clamping grooves and rotor clamping teeth which are matched with each other, the rotor clamping grooves are located on one side of the rotor core pieces, and the rotor clamping teeth are located on the other side of the rotor core pieces, so as to facilitate connection of the plurality of rotor core pieces.

According to some embodiments of the present invention, the rotor engaging groove includes a circular hole groove and an arc groove which are communicated with each other, and the rotor engaging tooth includes a short tooth which is matched with the circular hole groove and a long tooth which is matched with the arc groove, so that stability of connection between the rotor engaging groove and the rotor engaging tooth is improved.

According to some embodiments of the present invention, an end of the short tooth, which is far away from the long tooth, protrudes toward a direction far away from the rotor core piece, and an end of the long tooth, which is far away from the short tooth, protrudes toward a direction far away from the rotor core piece, so as to improve stability of connection between the rotor clamping groove and the rotor clamping tooth.

An embodiment of a second aspect of the present invention provides a range hood, including the above-mentioned novel motor core structure according to the first aspect.

The range hood provided by the embodiment of the utility model has the novel motor core structure provided by the embodiment of the first aspect, and the novel motor core structure comprises a stator core sheet and a rotor core sheet, wherein the stator core sheet is provided with a plurality of stator winding grooves, and a separation tooth for separating a coil is arranged between adjacent stator winding grooves, the width of the separation tooth is smaller than that of the bottom of the stator winding groove, so that the ratio of the tooth width to the width of the bottom of the groove is reduced, the effective area of the stator winding groove is increased, the fullness rate of the stator winding groove is effectively reduced, the phenomenon that a copper wire cannot be embedded due to overhigh fullness rate of the groove is avoided, and the temperature of a motor during operation is reduced. The limiting blocks arranged at the stator slot openings of the separating teeth can limit the installation positions of the coils, and the rotor iron core pieces are arranged in the circular through holes formed by the surrounding of the limiting blocks, so that the coils are prevented from being displaced and damaged due to the contact with the rotor iron core pieces when the rotor runs at a high speed. Through the cell type of adjustment stator wire winding groove, reduce the proportion of separating tooth width and stator tank bottom width to the area of increase stator wire winding groove reduces the full rate in groove of stator, improves the energy efficiency and the fluid power efficiency of motor, reduces the production degree of difficulty when improving the motor performance, improves production efficiency and product percent of pass.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

Additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a stator core segment of a novel motor core in accordance with some embodiments of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 from another perspective;

fig. 3 is a schematic structural view of a rotor core piece of the novel motor core of some embodiments of the present invention;

fig. 4 is a schematic view of the structure of fig. 3 from another perspective.

Reference numerals: the stator core piece comprises a stator core piece 110, a stator winding groove 111, a stator notch 112, a stator groove bottom 113, a separating tooth 114, a circular through hole 116, a stator clamping groove 117, a stator clamping tooth 118, a rotor core piece 120, a rotor winding groove 121, a rotor clamping groove 122, a rotor clamping tooth 123, a circular hole groove 124, an arc-shaped groove 125, a long tooth 126, a short tooth 127 and a limiting straight bar 130.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the description of the stator and the rotor is only used for distinguishing technical characteristics, the description cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical characteristics or implicitly indicating the precedence of the indicated technical characteristics.

In the description of the utility model, if the stator and the rotor are described only for distinguishing technical features, the description cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

The utility model provides a novel motor iron core structure which comprises a stator iron chip and a rotor iron chip, wherein the stator iron chip is in a circular shape, a plurality of stator winding grooves are formed in the stator iron chip and comprise a stator groove opening and a stator groove bottom, the stator groove bottom is in an arc shape, separating teeth for separating coils are arranged between adjacent stator winding grooves, the width of each separating tooth is smaller than that of the stator groove bottom, the ratio of the tooth width to the groove bottom width is reduced, the effective area of the stator winding grooves is increased, the stator groove fullness rate is effectively reduced, the phenomenon that copper wires cannot be embedded due to too high groove fullness rate is avoided, and the temperature of a motor during operation is reduced. The rotor iron core piece is arranged in the circular through hole formed by the surrounding of the limiting blocks, so that the damage caused by the contact of the displacement of the coil and the rotor iron core piece when the rotor runs at a high speed is avoided. Through the cell type of adjustment stator wire winding groove, reduce the proportion of separating tooth width and stator tank bottom width to the area of increase stator wire winding groove reduces the full rate in groove of stator, improves the energy efficiency and the fluid power efficiency of motor, reduces the production degree of difficulty when improving the motor performance, improves production efficiency and product percent of pass.

The embodiments of the present invention will be further explained with reference to the drawings.

In a first aspect, the present invention provides a novel motor core structure.

With reference to fig. 1, it can be understood that the novel motor core structure is provided with a stator core sheet 110 and a rotor core sheet 120, and the stator core sheet 110 is in a circular shape, and meets the use requirements of products, and is convenient to install on the required products. Be equipped with a plurality of stator wire winding grooves 111 on stator iron core piece 110, wherein, stator wire winding groove 111 includes stator notch 112 and stator tank bottom 113, still is equipped with the stator stopper in stator notch 112 department, and the stator stopper is located stator notch 112 department, can carry on spacingly to the position of installing the winding in stator wire winding groove 111, avoids the winding to follow stator wire winding groove 111 roll-off. The stator slot root is arc-shaped, and the effective area of the stator winding slot 111 can be increased compared with the stator slot root with other shapes, so that the coil capacity of the stator winding slot 111 can be increased. Be equipped with between the adjacent stator winding groove 111 and be used for separating the tooth 114 that separates of coil, the width that separates tooth 114 is less than the width of stator tank bottom 113, reduces the proportion of tooth width and tank bottom width, improves the effective area of stator winding groove 111, effectively reduces the stator tank fullness rate, avoids the too high unable copper line of embedding of tank fullness rate, reduces the temperature of motor during operation. Through the cell type of adjustment stator wire winding groove 111, reduce the proportion of separating tooth 114 width and stator tank bottom 113 width to increase stator wire winding groove 111's area, reduce the full rate of groove of stator, improve the energy efficiency and the fluid power efficiency of motor, satisfied the high efficiency demand of customer to the motor. In addition, the stator slot 112 of the stator core segment 110 opens toward the center of the stator core segment 110, a plurality of stator stoppers surround to form a circular through hole 116, and a rotor core segment 120 having a circular shape may be placed in the circular through hole 116. The rotor laminations 120 can rotate within the circular through holes 116 formed around the stator laminations 110. The rotor laminations 120 are provided with a plurality of rotor winding slots 121, the rotor winding slots 121 are also provided with rotor notches and rotor slot roots, wherein both sides of the rotor notches and the rotor slot roots are provided with rotor side walls, and the rotor winding slots 121 open towards the outside of the rotor laminations 120, i.e. towards the stator laminations 110. The rotor winding slot 121 is pear-shaped, so that the magnetic flux density saturation of a slot bottom angle can be reduced, and the service life of the asynchronous capacitor motor is prolonged. Size and appearance through adjustment stator wire winding groove 111 and rotor wire winding groove 121 have increased the area of stator wire winding groove 111 and rotor wire winding groove 121, can hold more wire winding parameters to can remove from and improve the full rate of groove and satisfy the energy efficiency of motor and the effect of fluid dynamic efficiency, save the processing cost.

It can be understood that the novel motor core structure may be provided with a plurality of stator core pieces 110, the stator core pieces 110 are provided with a stator connection structure, and the stator core pieces 110 may be connected with other stator core pieces 110 through the stator connection structure. Stator connection structure includes stator joint groove 117 and stator latch 118, stator latch 118 and stator joint groove 117 phase-match, stator joint groove 117 is located one side of stator iron core piece 110, and stator latch 118 is located the opposite side of stator iron core piece 110, consequently, stator iron core piece 110 can carry out the joint through stator latch 118 and the stator joint groove 117 of other stator iron core pieces 110 to stator iron core piece 110 can stack the combination through stator connection structure and other stator iron core pieces 110.

With reference to fig. 2, it can be understood that a plurality of stator engaging slots 117 and stator engaging teeth 118 may be provided, wherein the stator engaging slots 117 are arranged and distributed in a circular shape, and all the stator engaging teeth 118 are in one-to-one correspondence with all the stator engaging slots 117, i.e. the stator engaging teeth 118 are also arranged and distributed in a circular shape. After stator joint groove 117 and stator latch 118 joint are fixed, when receiving external force, stator joint groove 117 and the even atress of stator latch 118 that are circular shape range distribution, stator latch 118 is difficult for following stator joint groove 117 roll-off, improves the stability of being connected between stator latch 118 and the stator joint groove 117. When novel motor core structure is equipped with a plurality of stator iron core pieces 110, be the stator joint groove 117 and the stator latch 118 that circular shape arranged the distribution, can improve the stability of connecting between a plurality of stator iron core pieces 110.

It should be noted that the stator core piece 110 is circular and 88 mm in diameter and length. The diameter length of the circular through hole 116 formed by the first stopper in a surrounding manner is 49 mm, and the error interval is 0.05mm, while the diameter length of the rotor core piece 120 located in the circular through hole 116 is 48.65 mm, and the error interval is 0.02 mm. The stator winding slots 111 are uniformly distributed in a circular shape, the stator winding slots 111 are distributed around the circular shape with the diameter length of 61.5 mm, wherein the arc diameter length of the stator slot bottom 113 in the stator winding slots 111 is 4mm, the width of the stator slot bottom 113 is 6.5mm to 8mm, and the width of the tooth 114 of every two adjacent stator winding slots 111 is 3mm to 4 mm. The opening width of the stator opening of the stator winding slot 111 is 6.5mm, and the distance between two adjacent limiting blocks is 2.3 mm. The width ratio of the stator winding groove 111 to the width of the separating teeth 114 is wide, the ratio of the tooth width to the groove bottom width is reduced, the effective area of the stator winding groove 111 is increased, the fullness rate of the stator groove is effectively reduced, the phenomenon that the copper wire cannot be embedded due to overhigh fullness rate of the groove is avoided, and the temperature of the motor during operation is reduced.

It can be understood that, the stator core sheet 110 is provided with 16 stator winding slots 111, and 16 stator winding slots 111 are evenly distributed in a circular shape, and under the condition that the motor is normal, the stator winding slots 111 are arranged on the stator core sheet 110 as much as possible, so that the area of the stator winding slots 111 is increased, the winding parameters of the stator core sheet 110 are increased, the use performance of the motor is improved, and the efficiency is improved.

It can be understood that stator iron core piece 110 has seted up spacing vertical bar 130 at the outside edge, and spacing vertical bar 130 can be provided with many, and the length of spacing vertical bar 130 is 25 millimeters, and spacing vertical bar 130 can be convenient for stator iron core piece 110 and fix at motor housing, avoids stator iron core piece 110 to rock in motor housing, influences motor work.

With reference to fig. 3, it can be understood that the novel motor core structure is provided with a plurality of rotor core segments 120, the rotor core segments 120 are provided with a rotor connection structure, and the rotor core segments 120 can be connected with other rotor core segments 120 through the rotor connection structure. Rotor connection structure includes rotor joint groove 122 and rotor latch 123, rotor latch 123 and rotor joint groove 122 phase-match, rotor joint groove 122 is located one side of rotor iron core piece 120, and rotor latch 123 is located the opposite side of rotor iron core piece 120, consequently, rotor iron core piece 120 can carry out the joint through rotor latch 123 and other rotor iron core piece 120's rotor joint groove 122, thereby rotor iron core piece 120 can stack the combination through rotor connection structure and other rotor iron core pieces 120.

It will be appreciated that the rotor snap-in groove 122 includes a circular hole groove 124 and an arc-shaped groove 125, wherein the circular hole groove 124 communicates with the arc-shaped groove 125. The rotor latch 123 matched with the rotor latch groove 122 comprises a short tooth 127 and a long tooth 126, wherein the short tooth 127 is matched with the circular hole groove 124, and the long tooth 126 is matched with the arc-shaped groove 125, so that the short tooth 127 can enter the circular hole groove 124, and the long tooth 126 enters the arc-shaped groove 125 to complete the clamping connection of the rotor latch groove 122 and the rotor latch 123. The positions of the rotor clamping groove 122 and the rotor clamping tooth 123 may be corresponding, for example, after a circular hole groove 124 and an arc-shaped groove 125 are opened on one side of the rotor core piece 120, a short tooth 127 and a long tooth 126 are arranged on the corresponding position on the other side, so that the rotor core piece 120 is clamped and fixed with the circular hole grooves 124 and the arc-shaped grooves 125 of other rotor core pieces 120 through the short tooth 127 and the long tooth 126, and the assembly efficiency is improved.

With reference to fig. 4, it will be appreciated that the short teeth 127 project away from the long teeth 126, i.e., are angled outwardly, away from the rotor laminations 120, while the ends adjacent to the long teeth 126 are secured to the rotor laminations 120. Long teeth 126 also project away from rotor core piece 120, i.e., are angled outward, at an end distal from short teeth 127, and long teeth 126 are secured to rotor core piece 120 at an end proximal to short teeth 127. Therefore, the short teeth 127 and the long teeth 126 can both extend into the rotor clamping groove 122 through the respective ends tilted outwards to perform clamping fixation. And the stability of the clamping fixation between the rotor clamping teeth 123 and the rotor clamping grooves 122 can be improved by adjusting the outward protruding angle of the short teeth 127 and the long teeth 126.

In a second aspect, an embodiment of the present invention further provides a range hood, including the above novel motor core structure in the embodiment of the first aspect.

The range hood provided by the embodiment of the utility model comprises the novel motor core structure in the embodiment of the first aspect, the range hood comprises a stator iron core sheet 110 and a rotor iron core sheet 120, the stator iron core sheet 110 is in a circular shape, a plurality of stator winding grooves 111 are formed in the stator iron core sheet 110, each stator winding groove 111 comprises a stator notch 112 and a stator groove bottom 113, each stator groove bottom 113 is in an arc shape, a separating tooth 114 for separating coils is arranged between every two adjacent stator winding grooves 111, the width of each separating tooth 114 is smaller than that of each stator groove bottom 113, the ratio of the tooth width to the groove bottom width is reduced, the effective area of each stator winding groove 111 is increased, the stator groove fullness rate is effectively reduced, the problem that copper wires cannot be embedded due to overhigh groove fullness rate is avoided, and the temperature of a motor during operation is reduced. The rotor core piece 120 is arranged in the circular through hole 116 formed by surrounding a plurality of limiting blocks, and the damage caused by the displacement of the coil and the contact of the rotor core piece 120 when the rotor runs at a high speed is avoided. Through the cell type of adjustment stator wire winding groove 111, reduce the proportion of separating tooth 114 width and stator tank bottom 113 width to increase stator wire winding groove 111's area, reduce the full rate in groove of stator, improve the energy efficiency and the fluid power efficiency of motor, reduce the production degree of difficulty when improving the motor performance, improve production efficiency and product percent of pass.

Since the range hood in this embodiment and the novel motor core structure in the above embodiments belong to the same inventive concept, other specific embodiments of the range hood in this embodiment may refer to the specific embodiment of the novel motor core structure in the above embodiments, and in order to avoid redundancy, other specific embodiments of the range hood in this embodiment are not described herein again.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. A novel motor core structure, its characterized in that includes:

the stator iron core piece is circular, a plurality of stator winding grooves are formed in the stator iron core piece and comprise a stator notch and a stator groove bottom, the stator groove bottom is arc-shaped, spacing teeth are arranged between every two adjacent stator winding grooves, limiting blocks for fixing coils are arranged at the stator notch of each spacing tooth, the width of each spacing tooth is smaller than that of the stator groove bottom, and the limiting blocks surround to form a circular through hole;

the rotor iron chip is in a circular shape and is located in the circular through hole, the rotor iron chip is provided with a rotor winding groove, and the opening of the rotor winding groove faces the stator iron chip.

2. The novel motor core structure of claim 1, wherein the plurality of stator core pieces are provided, the stator core pieces are provided with stator connection structures for connecting other stator core pieces, the stator connection structures comprise matched stator clamping grooves and stator clamping teeth, the stator clamping grooves are located on one side of the stator core pieces, and the stator clamping teeth are located on the other side of the stator core pieces.

3. The novel motor iron core structure as claimed in claim 2, wherein a plurality of stator clamping grooves and a plurality of stator clamping teeth are arranged and distributed in a circular shape, and all the stator clamping grooves correspond to all the stator clamping teeth one to one.

4. The novel motor core structure of claim 1, wherein the arc diameter of the stator slot bottom is 4mm in length, the width of the stator slot bottom is 6.5mm to 8mm, and the width of the separating teeth is 3mm to 4 mm.

5. The novel motor core structure of claim 1, wherein the diameter length of the circular through hole is 49 ± 0.05mm, and the diameter length of the rotor core piece is 48.65 ± 0.02 mm.

6. The novel motor core structure of claim 1, wherein the outside of the stator core pieces are provided with a limiting straight bar for mounting the stator core pieces.

7. The novel motor iron core structure as claimed in claim 1, wherein the plurality of rotor iron core pieces are provided, the rotor iron core pieces are provided with rotor connecting structures for stacking connection with other rotor iron core pieces, the rotor connecting structures comprise matched rotor clamping grooves and rotor clamping teeth, the rotor clamping grooves are located on one side of the rotor iron core pieces, and the rotor clamping teeth are located on the other side of the rotor iron core pieces.

8. The novel motor iron core structure of claim 7, wherein the rotor clamping groove comprises a circular hole groove and an arc groove which are communicated, and the rotor clamping tooth comprises a short tooth matched with the circular hole groove and a long tooth matched with the arc groove.

9. The novel electric machine core structure of claim 8, wherein the end of the short teeth distal from the long teeth project away from the rotor core piece, and the end of the long teeth distal from the short teeth project away from the rotor core piece.

10. A range hood, characterized by comprising a novel motor core structure as claimed in any one of claims 1 to 9.