CN114204714A - Rotor punching sheet, rotor, permanent magnet motor and compressor - Google Patents
Rotor punching sheet, rotor, permanent magnet motor and compressor Download PDFInfo
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- CN114204714A CN114204714A CN202010889840.3A CN202010889840A CN114204714A CN 114204714 A CN114204714 A CN 114204714A CN 202010889840 A CN202010889840 A CN 202010889840A CN 114204714 A CN114204714 A CN 114204714A
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- 238000004080 punching Methods 0.000 title claims abstract description 45
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 97
- 239000010959 steel Substances 0.000 claims abstract description 97
- 238000002955 isolation Methods 0.000 claims description 9
- 230000005389 magnetism Effects 0.000 claims description 4
- 230000010349 pulsation Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/06—Magnetic cores, or permanent magnets characterised by their skew
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a rotor punching sheet, a rotor, a permanent magnet motor and a compressor, wherein the rotor punching sheet comprises a punching sheet body; the magnetic steel groove groups are uniformly distributed along the circumferential direction of the punching sheet body, each magnetic steel groove group comprises a first magnetic steel groove and a second magnetic steel groove, and the first magnetic steel groove and the second magnetic steel groove are intersected to form an L shape; the effective length of the magnetic steel M1 corresponding to the first magnetic steel groove is L7; the effective length of the magnetic steel M2 corresponding to the second magnetic steel groove is L8, and L7/L8 is more than or equal to 3 and less than or equal to 6. The permanent magnet torque peak value and the reluctance torque peak value are close to each other as much as possible through the asymmetric arrangement of the magnetic steel grooves, and the output torque of the permanent magnet motor of the compressor adopting the design mode can be improved by 10% on the premise of the same material consumption, so that the torque density of the motor is improved; meanwhile, through reasonable setting of the size and the position of the magnetic steel groove group and the air gap groove group, the torque pulsation of the motor can be reduced, the stability of the motor and the compressor is improved, and the noise of the compressor is reduced.
Description
Technical Field
The invention relates to the field of compressors, in particular to a rotor punching sheet, a rotor, a permanent magnet motor and a compressor.
Background
In recent years, motor technology, especially permanent magnet synchronous motor technology, has rapidly developed, the structural design of the motor body has become new day by day, the torque density and the power density of the motor have been designed more and more, and how to improve the torque density of the motor becomes an important subject for reducing the cost of the motor and improving the competitiveness of the motor.
For an embedded permanent magnet synchronous motor, one main way for improving the torque density is to fully utilize the reluctance torque of the embedded permanent magnet synchronous motor by adopting unit current Maximum Torque (MTPA) control in cooperation with a control system, but for a fractional slot motor, the cross influence of a dq-axis magnetic circuit is very easy to saturate, and the reluctance torque is not easy to utilize. The Mitsubishi motor and the like are designed with an asymmetric structure for each magnetic pole, and a magnetic isolation slit is added to directionally guide the direction of a magnetic field, so that the corresponding current angles are close when the permanent magnet torque and the reluctance torque reach the peak value, and the effect of increasing the torque density is achieved.
However, the above design scheme causes the harmonic distortion rate to be large, and the torque ripple and the sensitive order electromagnetic force harmonic to be large, thereby causing the noise performance to be deteriorated.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present invention and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a rotor punching sheet, a rotor, a permanent magnet motor and a compressor, wherein the peak value of permanent magnet torque and the peak value of reluctance torque are close to each other as much as possible through the asymmetric arrangement of magnetic steel grooves, so that the torque density of the motor is improved.
Some embodiments of the present invention provide a rotor sheet including:
punching a sheet body;
the punching sheet comprises a punching sheet body, a plurality of magnetic steel groove groups and a plurality of magnetic steel groove groups, wherein the magnetic steel groove groups are uniformly distributed along the circumferential direction of the punching sheet body, each magnetic steel groove group comprises a first magnetic steel groove and a second magnetic steel groove, and the first magnetic steel groove and the second magnetic steel groove are intersected to form an L shape;
the effective length of the magnetic steel M1 corresponding to the first magnetic steel groove is L7;
the effective length of the magnetic steel M2 corresponding to the second magnetic steel groove is L8, so that the requirement of
3≤L7/L8≤6。
According to some examples of the invention, the first magnetic steel slot is a distance L3 from the corresponding inter-pole centerline;
the distance between the second magnetic steel groove and the corresponding interpolar central line is L4, which satisfies the requirement
1≤L4/L3≤3。
According to some examples of the invention, an intersection point of the first magnetic steel groove and the second magnetic steel groove close to the center of the rotor forms an included angle d with a magnetic pole center line, and a connecting line of the rotor center and the magnetic pole center line meet the requirement that
0.2≤d/c≤0.4；
Wherein c is the central angle corresponding to each magnetic pole.
According to some examples of the invention, the rotor sheet further comprises a plurality of magnetic shielding slits, and each magnetic shielding slit is communicated with one first magnetic steel groove and one second magnetic steel groove.
According to some examples of the invention, the outer arc length of the punching sheet body corresponding to the region surrounded by the first magnetic steel groove and the magnetism isolating slit is L1;
the outer arc length of the punching sheet body corresponding to the region surrounded by the second magnetic steel groove and the magnetic isolation slit is L2, so that the requirement of L2 is met
1≤L1/L2≤3。
According to some examples of the invention, the rotor punching sheet further comprises a plurality of air gap groove groups, the air gap groove groups are arranged on the outer edge of the punching sheet body, each air gap groove group corresponds to one magnetic steel groove group, and each air gap groove group comprises a first air gap groove and a second air gap groove.
According to some examples of this invention, the first air gap groove has a width of L5;
the width of the second air gap groove is L6, which satisfies the requirement
1≤L6/L5≤3。
According to some examples of the invention, the first air gap groove and the second air gap groove are arc-shaped grooves arranged on the outer edge of the punching sheet body respectively.
According to some examples of the invention, a line connecting the center of the first air gap groove and the center of the rotor forms an included angle a with the center line of the magnetic pole;
the included angle formed by the connecting line of the center of the second air gap groove and the center of the rotor and the center line of the magnetic pole is b, so that the requirement of meeting the requirement of
a≤b。
10. The rotor sheet as recited in claim 6, wherein:
a/c is more than or equal to 0.2 and less than or equal to 0.4;
and c is a central angle corresponding to each magnetic pole, and a is an included angle formed by a connecting line of the center of the first air gap groove and the center of the rotor and the center line of the magnetic pole.
The invention further provides a rotor, which comprises the rotor punching sheet.
Still other embodiments of the present invention provide a permanent magnet motor including a rotor as described above.
Other embodiments of the present invention provide a compressor, including a permanent magnet motor, where the permanent magnet motor is the above permanent magnet motor.
The rotor punching sheet of the invention enables the peak value of the permanent magnet torque and the peak value of the reluctance torque to be as close as possible through the asymmetric arrangement of the magnetic steel slot group, and the output torque of the permanent magnet motor of the compressor by the design mode can be improved by 10 percent on the premise of the same material consumption, thereby improving the torque density of the motor; meanwhile, through reasonable setting of the size and the position of the magnetic steel groove group and the air gap groove group, the torque pulsation of the motor is reduced, the stability of the motor and the compressor is improved, and the noise of the compressor is reduced.
Drawings
Other features, objects, and advantages of the invention will be apparent from the following detailed description of non-limiting embodiments, which proceeds with reference to the accompanying drawings and which is incorporated in and constitutes a part of this specification, illustrating embodiments consistent with the present application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of a rotor sheet according to an embodiment of the present invention;
FIG. 2 is an enlarged schematic view of the oval dashed box in FIG. 1;
FIG. 3 is a graph showing the variation of the output torque of the motor according to the present invention as a function of the ratio between the effective length L7 of the magnetic steel M1 and the effective length L8 of the magnetic steel M2;
FIG. 4 is a graph of torque ripple of the motor as a function of the ratio between distance L3 and distance L4 in accordance with one embodiment of the present invention;
FIG. 5 is a graph of output torque of a motor according to an embodiment of the present invention as a function of the ratio between arc length L1 and arc length L2;
fig. 6 is a graph showing the variation of torque ripple of the motor according to the present invention with the ratio between the included angle d and the central angle c corresponding to each magnetic pole;
FIG. 7 is a graph of torque ripple of the motor of one embodiment of the present invention as a function of the ratio between the width L5 of the first air gap groove and the width L6 of the second air gap groove;
fig. 8 is a graph showing the variation of torque ripple of the motor according to the present invention as a function of the ratio between the included angle a and the central angle c corresponding to each magnetic pole.
Reference numerals
100 rotor punching sheet
110 punching sheet body
121 first magnetic steel groove
122 second magnetic steel groove
130 magnetic isolation slit
141 first air gap groove
142 second air gap groove
180 fastening hole
190 axle hole
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 examples 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 described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities.
Fig. 1 is a schematic structural diagram of a rotor sheet according to an embodiment of the present invention, specifically, the rotor sheet 100 includes:
a punching sheet body 110; the punching sheet body 110 is provided with an axial through shaft hole 190 and a plurality of fastening holes 180;
the plurality of magnetic steel groove groups are uniformly distributed along the circumferential direction of the punching sheet body 110, each magnetic steel groove group comprises a first magnetic steel groove 121 and a second magnetic steel groove 122, and the first magnetic steel groove 121 and the second magnetic steel groove 122 are intersected to form an L shape; the intersection point of the first magnetic steel groove 121 and the second magnetic steel groove 122 is close to the center of the rotor sheet. I.e., the opening of the L-shape is towards the outer edge of the punch body 110. The number of the magnetic steel slot groups is not limited, the number can be 2 to 6, and the rotor punching sheet in the embodiment of fig. 1 is provided with 6 magnetic steel slot groups.
In the prior art, the difference value between the peak value of the permanent magnet torque and the peak value of the reluctance torque is 45 degrees, and in order to improve the torque density and the power density of the motor, the difference value between the peak value of the permanent magnet torque and the peak value of the reluctance torque is close to each other as much as possible.
A magnetic steel slot group constitutes a magnetic pole, and as shown in fig. 1, OO' is a magnetic pole center line, and OC is a center line between two magnetic poles, i.e., an inter-pole center line. The included angle between the center lines of two adjacent interpolar lines is the circle center c corresponding to each magnetic pole.
Fig. 2 is an enlarged structural schematic diagram of an oval dashed-line frame in fig. 1, where an effective length of the magnetic steel M1 corresponding to the first magnetic steel slot 121 is L7; the effective length of the magnetic steel M2 corresponding to the second magnetic steel slot 122 is L8, and tests show that the output torque of the motor changes along with the change of the ratio between the effective length L7 of the magnetic steel M1 and the effective length L8 of the magnetic steel M2, and a specific output torque changes along with the change of the ratio L7/L8, which is shown in fig. 3; it can be seen that the output torque ratio L7/L8 of the motor monotonically increases when the ratio L7/L8 is in the interval of 2.5 to 4.5, and the output torque ratio L7/L8 of the motor monotonically decreases when the ratio L7/L8 is in the interval of 4.5 to 6.5, i.e., the output torque of the motor is the largest, i.e., the torque density of the motor is the largest, when the ratio L7/L8 is about 4.5. Therefore, it is preferable that 3. ltoreq. L7/L8. ltoreq.6 is satisfied, and more preferably, 4. ltoreq. L7/L8. ltoreq.5 is satisfied.
Meanwhile, defining the outer circular arc length HI of the punching sheet body 110 corresponding to the region enclosed by the first magnetic steel groove 121 and the magnetic isolation slit 130 as L1; the outer arc length IJ of the punching sheet body 110 corresponding to the region surrounded by the second magnetic steel groove 122 and the magnetic isolation slit 130 is L2. Tests show that the ratio between L1/L2 also influences the output torque of the motor, the change of the output torque of the motor along with the ratio between L1/L2 is shown in a graph in FIG. 5, and accordingly, in some embodiments of the invention, 1 ≦ L1/L2 ≦ 3 is satisfied.
During the operation of the motor of the compressor, the torque of the motor is large or small, and the torque pulsation of the motor can be used for describing the change condition of the torque of the motor. The larger the torque ripple of the motor is, the lower the stability is, and at the same time, the vibration of the motor and the noise caused by the vibration are also large, and in addition, the torque ripple also affects the stability of the rotational speed of the motor, and the energy consumption of the motor is increased.
The distance between the first magnetic steel groove 121 and the corresponding inter-pole center line is L3, the distance between the second magnetic steel groove 122 and the corresponding inter-pole center line is L4, and tests show that the torque ripple of the motor changes along with the change of the ratio between L4/L3, and a specific change chart is shown in FIG. 4. In order to reduce the torque pulsation of the motor, improve the stability of the motor and the compressor and reduce the noise, in another embodiment of the invention, 1 ≦ L4/L3 ≦ 3 is satisfied.
An included angle D formed by a connecting line OD between a crossing point D of the first magnetic steel groove 121 and the second magnetic steel groove 122 close to the rotor center O and the rotor center and a magnetic pole center line OO' is defined. Tests show that the ratio of the included angle d to the central angle c corresponding to each magnetic pole influences the torque ripple of the motor, and the relationship between the included angle d and the central angle c is shown in fig. 6. In order to reduce the torque pulsation of the motor, improve the stability of the motor and the compressor and reduce the noise, in some embodiments of the invention, d/c is more than or equal to 0.2 and less than or equal to 0.4.
In some embodiments of the present invention, the rotor sheet further includes a plurality of magnetic shielding slits 130, and each of the magnetic shielding slits 130 is communicated with one of the first magnetic steel grooves 121 and one of the second magnetic steel grooves 122. The larger the size of the slit is, the larger the magnetic flux leakage of the magnetic circuit is, and the worse the electromagnetic performance of the motor is; the smaller the size, the greater the centrifugal stress generated during operation of the machine, and the poorer the mechanical strength of the rotor, i.e. the size and position of the magnetic-isolating slits have a crucial influence on the performance of the electrodes. In the embodiment of fig. 1, the magnetism isolating slit 130 is disposed in the L-shaped opening of the first magnet steel groove 121 and the second magnet steel groove 122, and further, the magnetism isolating slit 130, the first magnet steel groove 121 and the second magnet steel groove 122 intersect. The size of the magnetic isolation slit can be set according to the size of an actual rotor punching sheet, a first magnetic steel groove, a second magnetic steel groove and the like, so that the mechanical strength of the rotor is improved while the magnetic leakage is reduced as much as possible, and the electromagnetic performance and the mechanical performance of the motor are improved.
In other embodiments of the present invention, the rotor punching sheet 100 further includes a plurality of air gap groove groups, which are disposed on an outer edge of the punching sheet body 110, and each air gap groove group corresponds to one magnetic steel groove group, and includes a first air gap groove 141 and a second air gap groove 142. The air gap groove group including the first air gap groove 141 and the second air gap groove 142 can effectively reduce noise while achieving reduction of torque ripple of the motor.
Tests have shown that the width and position of the first and second air gap grooves 141, 142 have an effect on the torque ripple of the machine.
In the embodiment of fig. 1, the first air gap groove 141 and the second air gap groove 142 are arc-shaped grooves respectively disposed on the outer edge of the punching sheet body 110. The first air gap groove 141 has a width L5; the width of the second air gap groove 142 is L6, the torque ripple of the motor varies with the ratio between L6/L5 as shown in fig. 7, in order to reduce the torque ripple of the motor, improve the stability of the motor and the compressor, and reduce the noise, in some embodiments of the invention, 1 ≦ L6/L5 ≦ 3 is satisfied.
Similarly, the positions of the first air gap groove 141 and the second air gap groove 142 can be set, and the included angle formed by the connecting line OA between the center a of the first air gap groove 141 and the center O of the rotor and the center line OO' of the magnetic pole is a; the angle formed by the line OB between the center B of the second air gap groove 141 and the center O of the rotor and the center line OO' of the magnetic pole is B. Fig. 8 shows a relationship between torque ripple of the motor and a ratio between the included angle a and a central angle c corresponding to each magnetic pole, and in order to reduce the torque ripple of the motor, improve stability of the motor and the compressor, and reduce noise, preferably, a/c is greater than or equal to 0.2 and less than or equal to 0.4, and the included angle a is greater than or equal to the included angle b.
Actual test results show that the output torque of the compressor permanent magnet motor with the rotor punching sheet of the design structure is improved by 10% on the premise of the same material consumption, so that the efficiency of the motor is improved, and meanwhile, the size and the position of the magnetic steel slot group can also ensure that the noise of the motor keeps the same level as that of the traditional motor.
The invention further provides a rotor, which comprises the rotor punching sheet. Specifically, still include a plurality of magnetic part, rotor core that rotor punching made, a plurality of magnetic part set up respectively in rotor core's magnet steel slot group.
Still other embodiments of the present invention provide a permanent magnet motor, which includes a rotor as described above, and may further include a stator core, a stator winding, and a plurality of motor leads. The magnetic poles of the permanent magnet motor are asymmetric, the difference value between the permanent magnet torque peak value and the reluctance torque peak value is reduced, and the torque density of the motor is effectively improved.
Other embodiments of the present invention provide a compressor, including a permanent magnet motor, where the permanent magnet motor is the above permanent magnet motor.
In summary, the invention provides a rotor punching sheet, a rotor with the rotor punching sheet, a permanent magnet motor with the rotor, and a compressor with the permanent magnet motor. The rotor punching sheet of the invention enables the peak value of the permanent magnet torque and the peak value of the magnetic resistance torque to be as close as possible through the asymmetric arrangement of the magnetic steel grooves, and the output torque of the permanent magnet motor of the compressor by the design mode is improved by 10 percent on the premise of the same material consumption, thereby improving the efficiency of the motor; meanwhile, through reasonable setting of the size and the position of the magnetic steel groove group and the air gap groove group, the torque pulsation of the motor can be reduced, the stability of the motor and the compressor is improved, and the noise of the compressor is reduced.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. A plurality of units or means recited in the apparatus claims may also be implemented by one unit or means in software or hardware. It is to be understood that the terms "center," "length," "width," "thickness," "top end," "bottom end," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," "outer," "axial," "circumferential," and the like, as used herein, refer to an orientation or positional relationship illustrated in the drawings, which is solely for convenience in describing and simplifying the disclosure, and does not indicate or imply that the referenced position or element must have a particular orientation, configuration, and operation, and is not to be considered limiting of the application; the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Claims (13)
1. A rotor punching sheet is characterized by comprising:
punching a sheet body;
the punching sheet comprises a punching sheet body, a plurality of magnetic steel groove groups and a plurality of magnetic steel groove groups, wherein the magnetic steel groove groups are uniformly distributed along the circumferential direction of the punching sheet body, each magnetic steel groove group comprises a first magnetic steel groove and a second magnetic steel groove, and the first magnetic steel groove and the second magnetic steel groove are intersected to form an L shape; wherein,
the effective length of the magnetic steel M1 corresponding to the first magnetic steel groove is L7;
the effective length of the magnetic steel M2 corresponding to the second magnetic steel groove is L8, so that the requirement of
3≤L7/L8≤6。
2. The rotor sheet according to claim 1, wherein:
the distance between the first magnetic steel groove and the corresponding inter-pole center line is L3;
the distance between the second magnetic steel groove and the corresponding interpolar central line is L4, which satisfies the requirement
1≤L4/L3≤3。
3. The rotor sheet according to claim 1, wherein:
the intersection point of the first magnetic steel groove and the second magnetic steel groove close to the center of the rotor and the included angle formed by the connecting line of the center of the rotor and the center line of the magnetic pole are d, so that the requirement of forming an included angle between the intersection point and the center line of the magnetic pole is met
0.2≤d/c≤0.4；
Wherein c is the central angle corresponding to each magnetic pole.
4. The rotor sheet as recited in claim 1, further comprising a plurality of magnetic isolation slots, each magnetic isolation slot being in communication with one of the first magnetic steel slots and one of the second magnetic steel slots.
5. The rotor sheet according to claim 4, wherein:
the excircle arc length of the punching sheet body corresponding to the region surrounded by the first magnetic steel groove and the magnetism isolating slit is L1;
the outer arc length of the punching sheet body corresponding to the region surrounded by the second magnetic steel groove and the magnetic isolation slit is L2, so that the requirement of L2 is met
1≤L1/L2≤3。
6. The rotor sheet according to claim 1, further comprising a plurality of air gap groove sets disposed at an outer edge of the sheet body, each air gap groove set corresponding to one of the magnetic steel groove sets, including a first air gap groove and a second air gap groove.
7. The rotor sheet as recited in claim 6, wherein:
the first air gap groove has a width of L5;
the width of the second air gap groove is L6, which satisfies the requirement
1≤L6/L5≤3。
8. The rotor sheet as recited in claim 6, wherein:
the first air gap groove and the second air gap groove are arc-shaped grooves arranged on the outer edge of the punching sheet body respectively.
9. The rotor sheet as recited in claim 6, wherein:
an included angle formed by a connecting line of the center of the first air gap groove and the center of the rotor and the center line of the magnetic pole is a;
the included angle formed by the connecting line of the center of the second air gap groove and the center of the rotor and the center line of the magnetic pole is b, so that the requirement of meeting the requirement of
a≤b。
10. The rotor sheet as recited in claim 6, wherein:
a/c is more than or equal to 0.2 and less than or equal to 0.4;
and c is a central angle corresponding to each magnetic pole, and a is an included angle formed by a connecting line of the center of the first air gap groove and the center of the rotor and the center line of the magnetic pole.
11. A rotor comprising a rotor sheet, wherein the rotor sheet is as claimed in any one of claims 1 to 10.
12. A permanent magnet machine comprising a rotor, wherein the rotor is according to claim 11.
13. A compressor comprising a permanent magnet motor, wherein the permanent magnet motor is the permanent magnet motor of claim 12.
Priority Applications (1)
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| CN202010889840.3A CN114204714B (en) | 2020-08-28 | 2020-08-28 | Rotor punching sheet, rotor, permanent magnet motor and compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010889840.3A CN114204714B (en) | 2020-08-28 | 2020-08-28 | Rotor punching sheet, rotor, permanent magnet motor and compressor |
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| CN114204714A true CN114204714A (en) | 2022-03-18 |
| CN114204714B CN114204714B (en) | 2024-07-02 |
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| CN201985644U (en) * | 2011-04-21 | 2011-09-21 | 江苏安捷机电技术有限公司 | 225 rare-earth permanent-magnet synchronous motor rotor sheet |
| JP2014103741A (en) * | 2012-11-19 | 2014-06-05 | Jtekt Corp | Magnet embedded type rotor |
| CN212518568U (en) * | 2020-08-28 | 2021-02-09 | 上海海立电器有限公司 | Rotor punching sheet, rotor, permanent magnet motor and compressor |
-
2020
- 2020-08-28 CN CN202010889840.3A patent/CN114204714B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000156945A (en) * | 1998-11-18 | 2000-06-06 | Hitachi Ltd | Permanent magnet electric rotating machine and permanent magnet induction synchronous motor |
| JP2001112200A (en) * | 1999-10-06 | 2001-04-20 | Aichi Emerson Electric Co Ltd | Rotor structure for brushless dc motor |
| CN201985644U (en) * | 2011-04-21 | 2011-09-21 | 江苏安捷机电技术有限公司 | 225 rare-earth permanent-magnet synchronous motor rotor sheet |
| JP2014103741A (en) * | 2012-11-19 | 2014-06-05 | Jtekt Corp | Magnet embedded type rotor |
| CN212518568U (en) * | 2020-08-28 | 2021-02-09 | 上海海立电器有限公司 | Rotor punching sheet, rotor, permanent magnet motor and compressor |
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