CN216851483U

CN216851483U - Rotor structure, permanent magnet synchronous motor and compressor

Info

Publication number: CN216851483U
Application number: CN202123439175.7U
Authority: CN
Inventors: 王鲁; 谭松柏; 王司暾; 施文杰
Original assignee: Shanghai Highly Electrical Appliances Co Ltd
Current assignee: Shanghai Highly Electrical Appliances Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-06-28
Anticipated expiration: 2031-12-31

Abstract

The utility model provides a rotor structure, PMSM and compressor. The rotor structure comprises a plurality of rotor punching sheets, each rotor punching sheet comprises a plurality of magnetic pole structures, the magnetic pole structures are distributed along the circumferential direction of the rotor punching sheet, each magnetic pole structure comprises a magnet slot, magnetic isolation bridges are arranged on two sides of each magnet slot, and the magnetic isolation bridges are communicated with the magnet slots; the minimum distance between every two adjacent magnetic isolation bridges is L2, and the minimum distance between every two adjacent magnetic isolation bridges is L1, so that the formula is satisfied: L1/L2 is more than or equal to 0.857 and less than or equal to 0.9375. The utility model discloses a select the reasonable size proportion that separates magnetic bridge and interpolar distance, effectively restrain the magnetic leakage condition of motor operation in-process to guarantee the intensity of motor product, and improve the performance of motor.

Description

Rotor structure, permanent magnet synchronous motor and compressor

Technical Field

The utility model relates to the technical field of electric machines, concretely relates to rotor structure, PMSM and compressor.

Background

Compared with the traditional asynchronous motor, the permanent magnet synchronous motor uses the permanent magnet to provide excitation, has the advantages of simple structure, high efficiency, energy conservation, low noise, stable operation, high efficiency, power density and the like, and is widely applied to the technical fields of aerospace, electric automobiles, rail transit, variable frequency air conditioners and the like. In order to reduce eddy current loss, the rotor structure of the existing permanent magnet synchronous motor is mostly made by laminating permanent magnet motor punching sheets, and permanent magnet materials are arranged on the permanent magnet motor punching sheets. The structural design of the permanent magnet motor punching sheet is closely related to the performance of the permanent magnet synchronous motor. When the permanent magnet motor punching sheet is designed, the inner and outer diameter sizes, the proportion, the groove size, the winding mode, the magnet material, the mark, the form, the using amount and the like need to be comprehensively considered so as to meet the requirement of the optimal performance. The rotor groove design has a great relationship to the back electromotive force and the torque pulse of the motor, and the magnetic flux leakage is increased when the design is unreasonable, so that the performance of the motor is reduced.

SUMMERY OF THE UTILITY MODEL

To the problem among the prior art, the utility model aims to provide a rotor structure, PMSM and compressor through the groove shape design to the rotor towards the piece, improves the performance of motor, and guarantees the intensity of motor product.

The embodiment of the utility model provides a rotor structure for permanent magnet synchronous motor, including a plurality of rotor punching sheets, each rotor punching sheet includes a plurality of magnetic pole structures, magnetic pole structure along the circumference distribution of rotor punching sheet, magnetic pole structure includes the magnet groove, each both sides of magnet groove are equipped with magnetic isolation bridge, magnetic isolation bridge with the magnet groove communicates; the minimum distance between every two adjacent magnetic isolation bridges is L2, and the minimum distance between every two adjacent magnetic isolation bridges is L1, which satisfies the formula: L1/L2 is more than or equal to 0.857 and less than or equal to 0.9375.

In some embodiments, the side corresponding to the minimum distance between two adjacent magnetic isolation bridges is a circular arc, and the diameter of the circular arc is D1, which satisfies the following conditions: d1 is more than or equal to 2mm and less than or equal to 3 mm.

In some embodiments, the L1 size is desirably between 0.6mm and 0.75 mm.

In some embodiments, the L2 size is desirably between 0.7mm and 0.8 mm.

In some embodiments, the minimum distance of the magnetic isolation bridge is set between the magnet slot and the outer arc of the rotor sheet.

In some embodiments, the shape of the magnetic pole structure is a V-shaped structure or a one-type structure.

In some embodiments, the magnetic pole structure comprises 8 pairs of magnetic poles.

In some embodiments, a permanent magnet is arranged in the magnet slot, and the shape of the permanent magnet is matched with that of the magnet slot.

An embodiment of the utility model provides a permanent magnet synchronous motor, include as above rotor structure.

The embodiment of the utility model provides a compressor, include as above PMSM.

The utility model provides a rotor structure, PMSM and compressor have following advantage:

the utility model provides an among the rotor structure, through the size proportion who selects reasonable magnetism bridge and interpole distance, effectively restrain the magnetic leakage condition of motor operation in-process, can improve the performance of motor, and guarantee the intensity of motor product.

Drawings

Other features, objects and advantages of the invention will become more apparent from a reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a rotor sheet of a rotor structure according to an embodiment of the present invention;

fig. 2 is an enlarged view of the area indicated by the circle in fig. 1.

Reference numerals:

1 rotor punching sheet

2 magnet slot

3 magnetic isolation bridge

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. In the specification, "or" may mean "and" or ".

As shown in fig. 1, the embodiment of the utility model provides a rotor punching of rotor structure for among the PMSM, rotor structure includes a plurality of rotor punching 1, each rotor punching 1 includes a plurality of magnetic pole structures, magnetic pole structure follows rotor punching 1's circumference distributes, magnetic pole structure includes magnet groove 2, each the both sides in magnet groove 2 are equipped with and separate magnetic bridge 3, separate magnetic bridge 3 with magnet groove 2 is linked together. Specifically, the magnetic structure of the rotor sheet 1 in the embodiment of the present invention is a built-in hybrid structure, and includes 8 pairs of magnetic poles, each of the magnetic poles is a V-shaped structure, that is, the corresponding magnet slot 2 is a V-shaped. In another embodiment, the magnet slot 2 may also be configured as other structures such as "a type", and the shape of the magnet slot in the present invention is not limited. The permanent magnet synchronous motor is characterized in that a permanent magnet is arranged in the magnet slot 2, the shape of the permanent magnet is matched with that of the magnet slot 2, and the permanent magnet is used for providing excitation for the permanent magnet synchronous motor and ensuring the starting rotation of the rotor structure.

The area that the circle points in fig. 2 is the enlargements between two adjacent magnet slots in fig. 1, as shown in the figure, every utmost point both sides of magnet slot 2 are provided with the hollow out construction of specific shape, and this hollow out construction is magnetic isolation bridge 3 of rotor for reduce the magnetic leakage of motor, improve permanent-magnet machine's electromagnetic property. Specifically, the minimum distance between the magnetic isolation bridges 3 on two adjacent magnetic pole structures 2 is L2, the minimum distance between the magnetic isolation bridges 3 on two adjacent magnetic pole structures 2 is L1, which is also called as a pole pitch, the edge corresponding to the minimum distance L1 between two adjacent magnetic isolation bridges 3 is an arc, the diameter of the arc is D1, and it is satisfied that D1 is larger than or equal to 2mm and smaller than or equal to 3mm, and the minimum distance between the magnetic isolation bridges 3 is set between the magnet slot 2 and the outer circular arc of the rotor sheet 1. The size design of the magnetic isolation bridge is closely related to the performance of the permanent magnet synchronous motor, when the size of the magnetic isolation bridge is too small, the magnetic leakage of the motor can be increased, the magnetic flux can be reduced, and the running efficiency of the motor can be influenced; and when the size of the magnetic isolation bridge is too large, the angle of the magnet slot is influenced. Similarly, the pole spacing L1 is a structure between two adjacent magnetic poles, and when the pole spacing L1 is too large, a magnetic flux closed loop in the region is enlarged, and magnetic flux leakage is increased, so that the operation efficiency of the motor is affected; however, when L1 is too small, the rotor sheet is difficult to process, and the strength of the rotor sheet is difficult to ensure. When the rotor structure is in high rotation, the rotor punching sheet and the permanent magnet in the magnetic steel groove are both subjected to centrifugal action, the rotating speed is higher, the centrifugal force is higher, the strength of the fragile part of the rotor punching sheet is insufficient under the action of larger centrifugal force, deformation can be caused, and the normal work of the rotor punching sheet can be influenced by the deformation. Therefore, the size design of the magnetic isolation bridge considers the motor efficiency and the strength of the rotor punching sheet at the same time, improves the operation efficiency of the motor and ensures the operation safety of the motor.

The embodiment of the utility model provides a design about rotor structure is for cooperating according to the stator to combine current mould stamping technology, through different magnetic isolation bridge size of emulation calculation analysis and different L1, L2 ratios, confirm the size of the back electromotive force and the output torque that the motor produced, with the magnetic leakage that reduces the motor under the same material quantity, improve the operating efficiency of motor. The following table is the result of comparative calculations based on different shape and proportions of the magnetic bridge:

from the above table, when the pole pitch L1 is 0.8mm, the torque and the back electromotive force output by the motor are small compared with those output by the motor with the smaller pole pitch L1(0.6mm, 0.7mm and 0.75mm), because when the pole pitch L1 is larger, a closed magnetic flux loop of the rotor itself is formed at the L1 part, and the number of the rotor structure and the stator flux linkage is reduced, thereby increasing the leakage flux and reducing the performance of the permanent magnet synchronous motor. When the pole pitch L1 is reduced, the output torque and the back electromotive force of the motor show an increasing trend, which indicates that the reduction of the size of L1 reduces the magnetic flux leakage of the motor and improves the running performance of the motor. Therefore, according to the simulation calculation, when the size of the pole spacing L1 is controlled to be between 0.6mm and 0.75mm, the size of the magnetic isolation bridge L2 is controlled to be between 0.7 and 0.8, and the proportion of the pole spacing of the rotor punching sheet and the magnetic isolation bridge meets the condition that the L1/L2 is more than or equal to 0.857 and less than or equal to 0.9375, the back electromotive force and the output torque of the motor are increased to a certain extent, the performance of the motor can be improved, the strength of the rotor punching sheet is not reduced, and the safety of a motor product is improved.

The embodiment of the utility model provides a permanent magnet synchronous motor is still provided, include as above rotor structure, consequently, permanent magnet synchronous motor includes all technological effects of rotor structure, this text is no longer repeated here.

The embodiment of the utility model provides a still provides a compressor, include as above permanent magnet synchronous machine, permanent magnet synchronous machine includes as above rotor structure, consequently, the compressor can obtain including all technological effects of rotor structure, and this paper is no longer repeated here.

the utility model discloses a select the reasonable size proportion that separates magnetic bridge and interpolar distance, effectively restrain the magnetic leakage condition of motor operation in-process to guarantee the intensity of motor product, and improve the performance of motor.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. A rotor structure for a permanent magnet synchronous motor, comprising:

the rotor punching sheet comprises a plurality of magnetic pole structures, the magnetic pole structures are distributed along the circumferential direction of the rotor punching sheet and comprise magnet slots, and magnetic isolation bridges are arranged on two sides of each magnet slot and communicated with the magnet slots;

the minimum distance between every two adjacent magnetic isolation bridges is L2, and the minimum distance between every two adjacent magnetic isolation bridges is L1, so that the formula is satisfied: L1/L2 is more than or equal to 0.857 and less than or equal to 0.9375.

2. The rotor structure of claim 1, wherein the side corresponding to the minimum distance between two adjacent magnetic isolation bridges is an arc, and the diameter of the arc is D1, so that the following conditions are met: d1 is more than or equal to 2mm and less than or equal to 3 mm.

3. The rotor structure of claim 1, wherein the L1 has a size between 0.6mm and 0.75 mm.

4. The rotor structure of claim 1, wherein the L2 has a size between 0.7mm and 0.8 mm.

5. The rotor structure of claim 4, wherein a minimum distance of the magnetic isolation bridge is provided between the magnet slots and an outer circular arc of the rotor plate.

6. The rotor structure according to claim 1, wherein the shape of the magnetic pole structure is a V-shaped structure or a one-type structure.

7. The rotor structure according to claim 6, characterized in that the pole structure comprises 8 pairs of poles.

8. The rotor structure according to claim 1, characterized in that permanent magnets are arranged in the magnet slots, and the shape of the permanent magnets is adapted to the shape of the magnet slots.

9. A permanent magnet synchronous machine comprising a rotor structure according to any of claims 1-8.

10. A compressor, characterized by comprising the permanent magnet synchronous motor according to claim 9.