CN219513856U - Special-shaped stator punching sheet and permanent magnet motor - Google Patents

Abstract

The utility model relates to the field of permanent magnet motors, in particular to a special-shaped stator punching sheet and a permanent magnet motor, wherein the stator punching sheet is of an inner stator structure, and stator teeth are uniformly arranged on the outer ring of the stator punching sheet along the circumferential direction; the stator teeth comprise a first tooth section and a second tooth section which are sequentially arranged along the radial direction of the stator punching sheet from inside to outside, the first tooth section and the second tooth section are fan-shaped, the bottom circle radius of the first tooth section is TW1, the bottom circle radius of the second tooth section is TW2, and TW1=TW2. The stator punching sheet is designed into an inner stator structure, the stator teeth are designed into a unique two-section special-shaped design, the bottom radii of the two tooth sections are equal, so that the widths of the stator teeth are relatively balanced by the design, the magnetic density distribution of the stator teeth is more uniform, the overall magnetic resistance is smooth, the magnetic conductivity is greatly improved, and the counter electromotive force of the stator punching sheet is also effectively improved.

Description

Special-shaped stator punching sheet and permanent magnet motor

Technical Field

The utility model relates to the field of permanent magnet motors, in particular to a special-shaped stator punching sheet and a permanent magnet motor.

Background

The permanent magnet motor (i.e. permanent magnet motor) has the advantages of high torque density, high power density, wider economic operation range and the like, and is widely applied to the fields of air conditioner compressors, electric automobiles, wind power generation, aerospace and the like.

At present, a stator slot of a stator punching sheet in a permanent magnet motor is usually designed into a single-segment rectangular slot, as shown in patent number CN214255899U, and the stator slot is designed to ensure that corresponding stator teeth are wide at a notch and narrow at a slot bottom, so that the magnetic density at a tooth top of the stator is low, the magnetic density at a tooth root is high, the magnetic permeability curve of a silicon steel sheet is nonlinear, the magnetic resistance increase at the high magnetic density is large, the magnetic resistance decrease at the low magnetic density is relatively small, the whole magnetic resistance is not smooth enough, and the magnetic conductivity is poor, so that the problem needs to be solved.

Disclosure of Invention

In order to avoid and overcome the technical problems in the prior art, the utility model provides a special-shaped stator punching sheet and a permanent magnet motor. The utility model ensures that the magnetic density distribution of the stator punching sheet is more uniform, the whole magnetic resistance is smooth, and the magnetic conductivity is greatly improved.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the special-shaped stator punching sheet is of an inner stator structure, and stator teeth are uniformly arranged on the outer ring of the stator punching sheet along the circumferential direction; the stator teeth comprise a first tooth section and a second tooth section which are sequentially arranged along the radial direction of the stator punching sheet from inside to outside, the first tooth section and the second tooth section are fan-shaped, the bottom circle radius of the first tooth section is TW1, the bottom circle radius of the second tooth section is TW2, and TW1=TW2.

As a further scheme of the utility model: there is first slot section between the first tooth section of two adjacent stator teeth, exists the second slot section between the second tooth section of two adjacent stator teeth, and first slot section and second slot section cooperation are in order to constitute open-ended stator groove, and the cross section area of first slot section cell body equals with the cross section area of second slot section cell body.

As still further aspects of the utility model: the cross sections of the first groove section and the second groove section are rectangular, the width of the groove body of the first groove section is SW1, the width of the groove body of the second groove section is SW2, the depth of the groove body of the first groove section is H1, the depth of the groove body of the second groove section is H2, and SW1 multiplied by H1=SW2 multiplied by H2.

As still further aspects of the utility model: two layers of stator coils are arranged in the stator slots, and the two layers of stator coils are respectively positioned in the first slot section and the second slot section.

As still further aspects of the utility model: the two sides of the stator coil are arranged at intervals of one group of stator slots so as to be respectively positioned in the two groups of non-adjacent stator slots.

As still further aspects of the utility model: the joint of the first tooth segment and the second tooth segment is in smooth transition through an arc.

A permanent magnet motor is provided, wherein the special-shaped stator punching sheet is arranged in the permanent magnet motor.

Compared with the prior art, the utility model has the beneficial effects that:

1. the stator punching sheet is designed into an inner stator structure, the stator teeth are designed into a unique two-section special-shaped design, the bottom radii of the two tooth sections are equal, so that the widths of the stator teeth are relatively balanced by the design, the magnetic density distribution of the stator teeth is more uniform, the overall magnetic resistance is smooth, the magnetic conductivity is greatly improved, and the counter electromotive force of the stator punching sheet is also effectively improved.

2. The special-shaped stator punching sheet is matched with a stator coil in a specific winding mode, so that the design requirement of the motor is met, the performance of the motor is greatly improved, and the magnetic circuit design of the motor is optimized.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is an enlarged view of the stator teeth of the present utility model.

Fig. 3a is a magnetic density distribution cloud of a conventional stator lamination.

Fig. 3b is a magnetic density distribution cloud of the stator laminations of the present utility model.

Fig. 4a is a back emf diagram of a conventional stator lamination.

Fig. 4b is a back emf diagram of a stator lamination of the present utility model.

Fig. 5 is a schematic diagram of a stator coil according to the present utility model.

In the figure:

1. stator teeth; 11. a first tooth segment; 12. a second tooth segment;

2. a stator groove; 21. a first trough section; 22. a second trough section.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-2, in an embodiment of the present utility model, a special-shaped stator lamination and a permanent magnet motor are provided, wherein the stator lamination has an inner stator structure and can be installed in the permanent magnet motor in cooperation with an outer rotor of the permanent magnet motor.

The outer ring of the stator punching sheet is uniformly provided with stator teeth 1 along the axial direction, the stator teeth 1 are of a two-section structure, and the two-section structure is in a fan plate shape. Along the radial direction of the stator punching sheet, the stator teeth 1 are formed by a first tooth segment 11 and a second tooth segment 12 from inside to outside, and the first tooth segment 11 and the second tooth segment 12 are of symmetrical structures and the symmetrical axes are coincident.

With the first tooth segment 11 having a base radius TW1, the second tooth segment 12 has a base radius TW2, tw1=tw2. The bottom radius is understood here as the radius of the arc edge of the first tooth segment 11 and the second tooth segment 12 on the side adjacent to the axial center of the stator lamination. The joint of the first tooth segment 11 and the second tooth segment 12 is smoothly transited through an arc line.

The hollow area between two adjacent groups of first tooth sections 11 is a stator groove 2, and the stator groove 2 is an open slot.

The stator slot 2 is of a two-section structure, and the stator slot 2 is formed by a first slot section 21 and a second slot section 22 from inside to outside along the radial direction of the stator punching sheet.

Wherein, the first tooth sections 11 of two adjacent stator teeth 1 are enclosed to form a first slot section 21, and the second tooth sections 12 of two adjacent stator teeth 1 are enclosed to form a second slot section 22.

The cross sections of the first and second groove sections 21, 22 are preferably rectangular, and the groove body cross-sectional areas of the first and second groove sections 21, 22 are equal. With the width of the first slot 21 being SW1 and the width of the second slot 22 being SW2, the depth of the first slot 21 being H1 and the depth of the second slot 22 being H2, sw1×h1=sw2×h2.

As shown in fig. 5, two layers of stator coils are distributed in any one group of stator slots 2, the stator coil of the upper layer is positioned in the first slot section 21, and the stator coil of the lower layer is positioned in the second slot section 22. The stator slots 2 and the stator teeth 1 are preferably arranged in 72 groups, each stator slot 2 being defined in numerical order along the stator lamination circumference, the two sides of the stator coil being arranged at intervals of one group of stator slots 2 such that the two sides of the stator coil are located within non-adjacent two groups of stator slots 2 at intervals of one group of stator slots 2. For example, two sides of the stator coil are positioned in the first stator slot and the third stator slot, or in the second stator slot or the fourth stator slot, and the stator coils are staggered with each other.

As shown in fig. 3a, the magnetic density distribution cloud chart of the conventional stator punching sheet is shown, and fig. 3b, the magnetic density distribution cloud chart of the stator punching sheet is shown, compared with the conventional stator punching sheet, the magnetic density distribution of the stator teeth of the stator punching sheet is more uniform, the overall magnetic resistance is smooth, and the magnetic conductivity is better.

As shown in fig. 4a, which is a back electromotive force diagram of a conventional stator lamination, fig. 4b is a back electromotive force diagram of a stator lamination of the present utility model, and compared with a conventional stator lamination, the back electromotive force of the stator lamination of the present utility model is higher, and when the stator lamination is applied to a motor, the motor power factor, power density and other performances are better.

The basic principles of the present utility model have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present utility model are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be considered as essential to the various embodiments of the present utility model. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the utility model is not necessarily limited to practice with the above described specific details.

The block diagrams of the devices, apparatuses, devices, systems referred to in the present utility model are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.

It is also noted that in the apparatus, devices and methods of the present utility model, the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present utility model.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the utility model. Thus, the present utility model is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the utility model to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.

Claims (7)

1. The special-shaped stator punching sheet is characterized in that the stator punching sheet is of an inner stator structure, and stator teeth (1) are uniformly arranged on the outer ring of the stator punching sheet along the circumferential direction; the stator teeth (1) comprise a first tooth segment (11) and a second tooth segment (12) which are sequentially arranged from inside to outside along the radial direction of the stator punching sheet, the first tooth segment (11) and the second tooth segment (12) are all in a fan plate shape, the bottom circle radius of the first tooth segment (11) is TW1, the bottom circle radius of the second tooth segment (12) is TW2, and TW1=TW2.

2. A shaped stator punching according to claim 1, characterized in that a first slot section (21) is present between the first tooth sections (11) of two adjacent stator teeth (1), a second slot section (22) is present between the second tooth sections (12) of two adjacent stator teeth (1), the first slot section (21) and the second slot section (22) cooperate to form an open stator slot (2), the cross-sectional area of the slot body of the first slot section (21) being equal to the cross-sectional area of the slot body of the second slot section (22).

3. The profiled stator punching sheet according to claim 2, characterized in that the cross sections of the first slot section (21) and the second slot section (22) are rectangular, the slot width of the first slot section (21) is SW1, the slot width of the second slot section (22) is SW2, the slot depth of the first slot section (21) is H1, the slot depth of the second slot section (22) is H2, sw1×h1=sw2×h2.

4. A shaped stator punching according to claim 2, characterized in that two layers of stator coils are arranged in the stator slots (2), the two layers of stator coils being located in the first slot section (21) and the second slot section (22), respectively.

5. A shaped stator lamination according to claim 4, characterized in that the two sides of the stator coil are arranged with a set of stator slots (2) spaced apart so as to be located in non-adjacent sets of stator slots (2), respectively.

6. A shaped stator punching according to claim 1, characterized in that the connection of the first tooth segment (11) and the second tooth segment (12) is rounded by means of an arc.

7. A permanent magnet motor, characterized in that the special-shaped stator punching sheet according to any one of claims 1-6 is installed in the permanent magnet motor.