CN112117846A - Special-shaped permanent magnet structure of motor rotor and compressor - Google Patents

Special-shaped permanent magnet structure of motor rotor and compressor Download PDF

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Publication number
CN112117846A
CN112117846A CN201910530835.0A CN201910530835A CN112117846A CN 112117846 A CN112117846 A CN 112117846A CN 201910530835 A CN201910530835 A CN 201910530835A CN 112117846 A CN112117846 A CN 112117846A
Authority
CN
China
Prior art keywords
permanent magnet
motor rotor
electric machine
rotor
magnet structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910530835.0A
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Chinese (zh)
Inventor
张志华
张兴志
汪圣原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Highly Electrical Appliances Co Ltd
Original Assignee
Shanghai Highly Electrical Appliances Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Highly Electrical Appliances Co Ltd filed Critical Shanghai Highly Electrical Appliances Co Ltd
Priority to CN201910530835.0A priority Critical patent/CN112117846A/en
Publication of CN112117846A publication Critical patent/CN112117846A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotors
    • H02K1/272Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2213/00Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03Machines characterised by numerical values, ranges, mathematical expressions or similar information

Abstract

The invention provides a special-shaped permanent magnet structure of a motor rotor and a compressor, wherein a plurality of permanent magnets are arranged in the motor rotor along the rotation direction of the motor rotor, and the thickness A of the other end of each permanent magnet, which is positioned at the rear part of the rotation direction of the motor rotor, is as follows: the thickness B of one end of the permanent magnet, which is positioned in front of the motor rotor in the rotation direction, is 1.01-1.50. The embodiment of the invention has the advantages that the distribution of the permanent magnet consumption is more reasonable, the local demagnetization of the permanent magnet can be effectively prevented, and the demagnetization resistance of a certain compressor motor can be improved under the same permanent magnet consumption.

Description

Special-shaped permanent magnet structure of motor rotor and compressor
Technical Field
The invention relates to the field of compressors of refrigeration equipment such as air conditioners, refrigerators and the like, in particular to a special-shaped permanent magnet structure of a motor rotor and a compressor with the same.
Background
The compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas, and is the heart of a refrigeration system. The refrigerating cycle is powered by sucking low-temperature and low-pressure refrigerant gas from the air suction pipe, driving the piston to compress the refrigerant gas through the operation of the motor, and discharging high-temperature and high-pressure refrigerant gas to the exhaust pipe.
As shown in fig. 1 and 2, an embedded permanent magnet structure 1 is commonly used in a rotor of a conventional compressor motor. The permanent magnet 1 is mostly formed by sintering, bonding, pressing and the like and then machined and cut.
And as shown in fig. 3 and 4, because of the limitation of the processing mode of the permanent magnet 1, the pattern is single, and mostly has a symmetrical structure with equal thickness, i.e. the thicknesses a and B at two ends are the same. Because the motor is in actual operation, the magnetizing and demagnetizing effects of the motor exist, namely the magnetizing and demagnetizing effects exist on the permanent magnet 1. At the end of the demagnetization effect of the permanent magnet 1, the permanent magnet 1 is more likely to generate a local irreversible demagnetization phenomenon, thereby affecting the performance of the motor and even causing adverse effects such as the motor being incapable of running.
Therefore, those skilled in the art are dedicated to develop a structure of a permanent magnet that effectively prevents the permanent magnet from local demagnetization and magnetization phenomena, which affect the operation of the motor.
Therefore, the invention provides a novel special-shaped permanent magnet structure of a motor rotor and a compressor with the same.
Disclosure of Invention
The invention aims to provide a special-shaped permanent magnet structure of a motor rotor and a compressor with the same, so that the consumption distribution of permanent magnets is more reasonable, the influence on the operation of the motor due to the local demagnetization and the magnetism increase of the permanent magnets can be effectively prevented, and the demagnetization resistance of a certain compressor motor can be improved under the same consumption of the permanent magnets.
According to one aspect of the invention, a plurality of permanent magnets are arrayed in the motor rotor along the rotation direction of the motor rotor, the thickness of one end, located in front of the rotation direction of the motor rotor, of each permanent magnet is B, the thickness of the other end (32), located behind the rotation direction of the motor rotor (2), of each permanent magnet (3) is A, A, B meets the requirement that A > B, and A: B is 1.01-1.50. .
Preferably: the cross section of the permanent magnet is trapezoidal.
Preferably: the cross section of the permanent magnet is in an isosceles trapezoid shape.
Preferably: the ratio of the bottom edge to the top edge of the isosceles trapezoid is 1.01-1.50.
Preferably: the cross section of the permanent magnet is in a gradually-changed arc shape, namely, the side line of the cross section is a gradually-changed arc, and the diameter of the arc is gradually increased from one end of the permanent magnet to the other end of the permanent magnet.
Preferably: the permanent magnet is formed by injection molding of magnetic powder.
Preferably: the grain size of the magnetic powder grains is less than or equal to 1.0 micron.
Preferably: the permanent magnet contains a refrigerant-resistant resin.
Preferably: the permanent magnet contains polyphenylene sulfide (PPS).
Preferably: at 20 ℃, the remanence of the permanent magnet satisfies: br is more than or equal to 1.0T and more than or equal to 0.6T, and the intrinsic coercive force of the permanent magnet meets the following requirements: 1500kA/m is more than or equal to Hcj is more than or equal to 900 kA/m.
According to another aspect of the invention, there is also provided a compressor comprising a shaped permanent magnet structure of an electric machine rotor according to any one of the above.
According to the special-shaped permanent magnet structure of the motor rotor and the compressor with the special-shaped permanent magnet structure, the thickness of the permanent magnet on the demagnetized side is increased, the thickness of the magnetized side is correspondingly reduced, the consumption distribution of the permanent magnet is more reasonable, the local demagnetization phenomenon of the permanent magnet can be effectively prevented, and the demagnetization resistance of a certain compressor motor can be improved under the same consumption of the permanent magnet.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of a prior art shaped permanent magnet configuration of a motor rotor;
FIG. 2 is a cross-sectional view of a prior art shaped permanent magnet configuration of another electric machine rotor;
FIG. 3 is a cross-sectional view of permanent magnets within the rotor of the machine of FIG. 1;
FIG. 4 is a cross-sectional view of permanent magnets within the rotor of the machine of FIG. 2;
fig. 5 is a schematic sectional structure view of a shaped permanent magnet structure of a motor rotor of embodiment 1 of the present invention;
fig. 6 is a schematic sectional structure view of a shaped permanent magnet structure of a motor rotor of embodiment 2 of the present invention;
FIG. 7 is a cross-sectional view of permanent magnets within the motor rotor of FIG. 5;
fig. 8 is a cross-sectional view of permanent magnets in the rotor of the machine of fig. 6.
Reference numerals
1 permanent magnet of the prior art
2 electric machine rotor
3 permanent magnet
31 one end of the permanent magnet
32 the other end of the permanent magnet
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.
As shown in fig. 5 and 6, in an embodiment of the present invention, a special-shaped permanent magnet structure of a motor rotor and a compressor having the same are provided, in which a motor is disposed in the compressor, the motor includes a motor rotor 2, a plurality of magnet slots are disposed in the motor rotor 2, and a plurality of permanent magnets 3 are disposed in the magnet slots. The permanent magnets 3 are mutually arranged end to form a similar ring shape. In the embodiment of the present invention, the number of the respective permanent magnets 3 is 6.
When the motor is running, the motor rotor 2 rotates in the direction F shown in fig. 5 and 6, and the plurality of permanent magnets 3 in the motor rotor 2 correspondingly rotate in the direction F.
And in combination, as shown in fig. 7 and 8, the thickness B of one end 31 of the permanent magnet 3 located forward in the rotational direction of the motor rotor 2 is smaller than the thickness a of the other end 32 of the permanent magnet 3 located rearward in the rotational direction of the motor rotor 2. A: b is 1.01 to 1.50.
In the embodiment of the invention, the thickness of the permanent magnet on the demagnetizing side is increased, and the thickness of the magnetizing side is correspondingly reduced, so that the consumption distribution of the permanent magnet is more reasonable, and the local demagnetization of the permanent magnet can be effectively prevented. Under the same permanent magnet consumption, the demagnetization resistance of the compressor motor can be improved to a certain extent.
As shown in fig. 7 and 8, in the embodiment of the present invention, the permanent magnet 3 has a shape of a plate or an arc. And as shown in fig. 5 and 7, it is preferable that the permanent magnet 3 has a trapezoidal, preferably isosceles trapezoidal, shape in a cross section parallel to the rotation direction of the motor rotor 2, so that the amount distribution is optimized and the demagnetization resistance is improved. The section parallel to the direction of rotation of the motor rotor 2 is the section shown in fig. 7 and 8. Further, the ratio of the bottom edge to the top edge of the isosceles trapezoid is preferably 1.01-1.50, and preferably 1.20.
As shown in fig. 6 and 8, the permanent magnet 3 is preferably in a gradually changing arc shape in a cross section parallel to the rotation direction of the motor rotor 2, i.e., the side line of the cross section is a gradually changing arc, the diameter of the arc is gradually increased from one end of the permanent magnet to the other end, and the ratio of the bottom edge to the top edge of the arc is preferably 1.01-1.50, and preferably 1.20.
As shown in fig. 5 and 6, in the embodiment of the present invention, it is preferable that the permanent magnet 3 is molded by injection molding magnetic powder. The grain size of the magnetic powder is less than or equal to 1.0 micron. The permanent magnet 3 contains a refrigerant-resistant resin such as polyphenylene sulfide (PPS).
And preferably at 20 ℃, the remanence of the permanent magnet satisfies: br is more than or equal to 1.0T and more than or equal to 0.6T, and the intrinsic coercive force of the permanent magnet meets the following requirements: 1500kA/m is more than or equal to Hcj is more than or equal to 900 kA/m.
The invention is described below with reference to specific embodiments and with reference to the attached drawings:
example 1
As shown in fig. 5 and 7, a shaped permanent magnet structure of a motor rotor and a compressor having the same.
Be equipped with the motor in the compressor, the motor includes electric motor rotor 2, and electric motor rotor 2's inside is equipped with 6 magnet grooves, is equipped with 6 permanent magnets 3 in the 6 magnet grooves. The 6 permanent magnets 3 are mutually arranged end to form a similar ring shape.
During operation of the electric machine, the machine rotor 2 rotates in the direction F shown in fig. 5, and the 6 permanent magnets 3 in the machine rotor 2 correspondingly rotate in the direction F.
The permanent magnet 3 is shaped like a plate, and the permanent magnet 3 has an isosceles trapezoid shape in a cross section parallel to the rotation direction of the motor rotor 2.
And in combination, as shown in fig. 7, the thickness B of one end 31 of the permanent magnet 3 located forward in the rotational direction of the motor rotor 2 is smaller than the thickness a of the other end 32 of the permanent magnet 3 located rearward in the rotational direction of the motor rotor 2. A: b is 1.01.
The permanent magnet 3 is formed by injecting magnetic powder into the magnet groove. The grain size of the magnetic powder is 1.0 micron. The permanent magnet 3 contains polyphenylene sulfide (PPS).
At 20 ℃, the remanence of the permanent magnet satisfies: br is 0.6T, and the intrinsic coercive force of the permanent magnet meets the following requirements: hcj is 900 kA/m.
Example 2
As shown in fig. 6 and 8, a shaped permanent magnet structure of a motor rotor and a compressor having the same.
Be equipped with the motor in the compressor, the motor includes electric motor rotor 2, and electric motor rotor 2's inside is equipped with 6 magnet grooves, is equipped with 6 permanent magnets 3 in the 6 magnet grooves. The 6 permanent magnets 3 are mutually arranged end to form a similar ring shape.
During operation of the electric machine, the machine rotor 2 rotates in the direction F shown in fig. 6, and the 6 permanent magnets 3 in the machine rotor 2 correspondingly rotate in the direction F.
The permanent magnet 3 is in the shape of a gradual change circular arc, and the diameter of the circular arc is gradually increased from one end 31 to the other end 32 of the permanent magnet 3. And in combination, as shown in fig. 8, the thickness B of one end 31 of the permanent magnet 3 located forward in the rotational direction of the motor rotor 2 is smaller than the thickness a of the other end 32 of the permanent magnet 3 located rearward in the rotational direction of the motor rotor 2. A: b is 1.5.
The permanent magnet 3 is formed by injecting magnetic powder into the magnet groove. The grain size of the magnetic powder is 0.8 micron. The permanent magnet 3 contains polyphenylene sulfide (PPS).
At 20 ℃, the remanence of the permanent magnet satisfies: br is 0.8T, and the intrinsic coercive force of the permanent magnet meets the following requirements: hcj is 1200 kA/m.
Example 3
As shown in fig. 5 and 7, a shaped permanent magnet structure of a motor rotor and a compressor having the same.
Be equipped with the motor in the compressor, the motor includes electric motor rotor 2, and electric motor rotor 2's inside is equipped with 6 magnet grooves, is equipped with 6 permanent magnets 3 in the 6 magnet grooves. The 6 permanent magnets 3 are mutually arranged end to form a similar ring shape.
During operation of the electric machine, the machine rotor 2 rotates in the direction F shown in fig. 5, and the 6 permanent magnets 3 in the machine rotor 2 correspondingly rotate in the direction F.
The permanent magnet 3 is shaped like a plate, and the permanent magnet 3 has an isosceles trapezoid shape in a cross section parallel to the rotation direction of the motor rotor 2.
And in combination, as shown in fig. 7, the thickness B of one end 31 of the permanent magnet 3 located forward in the rotational direction of the motor rotor 2 is smaller than the thickness a of the other end 32 of the permanent magnet 3 located rearward in the rotational direction of the motor rotor 2. A: b ═ 1.2.
The permanent magnet 3 is formed by injecting magnetic powder into the magnet groove. The grain size of the magnetic powder is 1.0 micron. The permanent magnet 3 contains polyphenylene sulfide (PPS).
At 20 ℃, the remanence of the permanent magnet satisfies: br is 1.0T, and the intrinsic coercive force of the permanent magnet meets the following requirements: hcj is 1500 kA/m.
In summary, according to the special-shaped permanent magnet structure of the motor rotor and the compressor with the same, the thickness of the permanent magnet on the demagnetized side is increased, the thickness of the magnetized side is correspondingly reduced, the amount of the permanent magnet is more reasonably distributed, and the local demagnetization of the permanent magnet can be effectively prevented. Under the same permanent magnet consumption, the demagnetization resistance of the compressor motor can be improved to a certain extent.
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. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (10)

1. The special-shaped permanent magnet structure of the motor rotor is characterized in that a plurality of permanent magnets (3) are arranged in the motor rotor (2) along the rotating direction of the motor rotor (2), the thickness of one end (31) of each permanent magnet (3) located in front of the rotating direction of the motor rotor (2) is B, the thickness of the other end (32) of each permanent magnet (3) located behind the rotating direction of the motor rotor (2) is A, A, B meets the requirement that A is larger than B, and A is 1.01-1.50.
2. The shaped permanent magnet structure of an electric machine rotor of claim 1, wherein: the cross section of the permanent magnet (3) is trapezoidal.
3. The shaped permanent magnet structure of an electric machine rotor of claim 2, wherein: the cross section of the permanent magnet (3) is in an isosceles trapezoid shape.
4. A shaped permanent magnet structure of an electric machine rotor according to claim 3, characterized in that: the ratio of the bottom edge to the top edge of the isosceles trapezoid is 1.01-1.50.
5. The shaped permanent magnet structure of an electric machine rotor of claim 1, wherein: the cross section of the permanent magnet (3) is in a gradually-changed arc shape.
6. The shaped permanent magnet structure of an electric machine rotor of claim 1, wherein: the permanent magnet (3) is formed by injection molding of magnetic powder.
7. The shaped permanent magnet structure of an electric machine rotor of claim 6, wherein: the grain size of the magnetic powder grains is less than or equal to 1.0 micron.
8. The shaped permanent magnet structure of an electric machine rotor of claim 6, wherein: the permanent magnet (3) contains a refrigerant-resistant resin.
9. The shaped permanent magnet structure of an electric machine rotor of claim 5, wherein: the remanence of the permanent magnet (3) at 20 ℃ satisfies: br is more than or equal to 1.0T and more than or equal to 0.6T, and the intrinsic coercive force of the permanent magnet (3) meets the following requirements: 1500kA/m is more than or equal to Hcj is more than or equal to 900 kA/m.
10. A compressor, characterized by comprising a shaped permanent magnet structure of an electric machine rotor according to any of claims 1-9.
CN201910530835.0A 2019-06-19 2019-06-19 Special-shaped permanent magnet structure of motor rotor and compressor Pending CN112117846A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910530835.0A CN112117846A (en) 2019-06-19 2019-06-19 Special-shaped permanent magnet structure of motor rotor and compressor

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Application Number Priority Date Filing Date Title
CN201910530835.0A CN112117846A (en) 2019-06-19 2019-06-19 Special-shaped permanent magnet structure of motor rotor and compressor

Publications (1)

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CN112117846A true CN112117846A (en) 2020-12-22

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CN208571744U (en) * 2018-01-03 2019-03-01 广东美芝制冷设备有限公司 Rotor, magneto and compressor
CN208890500U (en) * 2018-11-07 2019-05-21 珠海格力电器股份有限公司 Magneto and rotor
CN209516769U (en) * 2019-03-12 2019-10-18 南昌海立电器有限公司 Rotor and motor

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