CN112653268A - Rotor core, asynchronous starting permanent magnet synchronous motor and canned motor pump - Google Patents
Rotor core, asynchronous starting permanent magnet synchronous motor and canned motor pump Download PDFInfo
- Publication number
- CN112653268A CN112653268A CN202011209186.3A CN202011209186A CN112653268A CN 112653268 A CN112653268 A CN 112653268A CN 202011209186 A CN202011209186 A CN 202011209186A CN 112653268 A CN112653268 A CN 112653268A
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- Prior art keywords
- magnetic steel
- groove
- rotor
- magnetic
- rotor core
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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
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner 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
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
- H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
-
- 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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- 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
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/46—Motors having additional short-circuited winding for starting as an asynchronous motor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention relates to a rotor core, an asynchronous starting permanent magnet synchronous motor and a canned motor pump, wherein the rotor core is formed by laminating a plurality of rotor punching sheets; the end face of the iron core body is provided with a conductor groove, an axle hole and a magnetic steel groove area; the conductor groove is arranged at the edge of the end face and is provided with a copper bar; the shaft hole is arranged in the center of the end face and used for penetrating through the rotating shaft; the magnetic steel slot regions are arranged in an annular region formed between the conductor slots and the shaft hole, and the plurality of magnetic steel slot regions are distributed in central symmetry; a first magnetic steel groove, a second magnetic steel groove and a rotor clearance groove are sequentially arranged in each magnetic steel groove; the first magnetic steel groove and the second magnetic steel groove are both provided with magnetic steel, so that the working efficiency of the motor is improved, and the technical effect of reducing the cost of the motor is achieved.
Description
Technical Field
The invention relates to the technical field of electric pumps, in particular to a rotor core, an asynchronous starting permanent magnet synchronous motor and a canned motor pump.
Background
With the higher and higher awareness of consumers on energy conservation and emission reduction, the energy efficiency requirement on the canned motor pump is increased.
Most of the existing canned motor pumps use asynchronous motors, although the cost is low, the generation of rotor magnetic fields in the asynchronous motors needs extra energy consumption, so that the efficiency of the asynchronous motors is low, and further the canned motor pumps using the asynchronous motors are low in efficiency. In addition, a few canned motor pumps are used to improve efficiency, but the canned motor pump requires an expensive driver, so that the total cost is greatly increased.
Disclosure of Invention
The invention aims to provide a rotor core, an asynchronous starting permanent magnet synchronous motor and a shield pump, and achieves the technical effects of improving the working efficiency of the motor and reducing the cost of the motor.
In order to achieve the above object, a first aspect of the present application provides a rotor core, where the rotor core is formed by laminating a plurality of rotor sheets;
the end face of the iron core body is provided with a conductor groove, an axle hole and a magnetic steel groove area;
the conductor groove is arranged at the edge of the end face and is provided with a copper bar;
the shaft hole is arranged in the center of the end face and is used for penetrating through the rotating shaft;
the magnetic steel slot regions are arranged in an annular region formed between the conductor slots and the shaft hole, and the magnetic steel slot regions are distributed in a centrosymmetric manner;
a first magnetic steel groove, a second magnetic steel groove and a rotor clearance groove are sequentially arranged in each magnetic steel groove;
and magnetic steels are arranged in the first magnetic steel groove and the second magnetic steel groove.
Furthermore, a limit column is arranged at the joint of the first magnetic steel groove and the second magnetic steel groove, and a limit step is arranged on the second magnetic steel groove and the rotor clearance groove.
Further, when the magnetic steel is installed in the first magnetic steel groove, a gap exists between the end part of the magnetic steel and the end part of the first magnetic steel groove;
when the magnetic steel is arranged in the second magnetic steel groove, a magnetic isolation gap is formed between the end part of the magnetic steel and the end part of the second magnetic steel groove.
And furthermore, one end of each two adjacent magnetic steel slot domains, which is used for installing the magnetic steels in different polarity directions and is close to each other, is the rotor clearance slot.
Furthermore, the adjacent two magnetic steel grooves are used for installing the magnetic steel in the same polarity direction, one end of the magnetic steel grooves close to each other is the first magnetic steel groove, and a magnetic bridge is arranged between the two adjacent first magnetic steel grooves.
Further, the magnetic bridge and two adjacent magnetic steel slot regions are arranged at an angle of 100-120 degrees;
the first magnetic steel groove and the second magnetic steel groove in the same magnetic steel groove domain are arranged at an angle of 120-150 degrees.
Further, still include: an auxiliary groove;
the auxiliary grooves are distributed on the outer sides of the first magnetic steel groove and the second magnetic steel groove and are respectively located at corresponding corner positions in one side of the magnetic steel.
In order to achieve the above object, the second aspect of the present application provides an asynchronous starting permanent magnet synchronous motor, which includes a stator core, a rotor core, a stator shielding sleeve, and a rotor shielding sleeve, wherein the stator shielding sleeve and the rotor shielding sleeve are disposed between the stator core and the rotor core.
Furthermore, the stator shielding sleeve is made of metal materials or plastic materials, and the rotor shielding sleeve is made of metal materials.
To achieve the above object, a third aspect of the present application provides a canned motor pump comprising an asynchronously started permanent magnet synchronous motor as described in the second aspect.
It can be seen from above that, the technical scheme that this application provided optimizes through the structure to rotor core, includes at least: set up the magnet steel slot territory in rotor core, and set gradually first magnet steel slot, second magnet steel slot and rotor slot in every magnet steel slot territory, magnet steel is all installed to first magnet steel slot and second magnet steel slot for dispose rotor core's motor, can possess PMSM and asynchronous machine's characteristic simultaneously. Specifically, the starting process of the motor can be completed by the characteristics of an asynchronous motor, and the steady-state operation process of the motor can be completed by the characteristics of a permanent magnet synchronous motor, so that the motor can be automatically started on the premise of no need of a driver, and the motor can stably operate in a permanent magnet synchronous motor form, thereby greatly improving the efficiency of the steady-state motor.
Furthermore, in the starting process of the asynchronous starting permanent magnet synchronous motor, the size of a stator magnetic field is 3-7 times that of a stator magnetic field in steady-state operation, and a rotor needs a higher demagnetization-resistant design. The structure of arranging the magnetic bridge in the rotor core can reduce the effect of the stator magnetic field on the magnetic steel in the starting process of the motor and improve the demagnetization resistance of the magnetic steel.
Furthermore, the rotor core is still provided with an auxiliary groove structure, so that the magnetic resistance of the position of the edge of the outer side of the magnetic steel can be increased, and the demagnetization resistance of the edge of the magnetic steel is improved.
Drawings
Fig. 1 is a schematic structural diagram of an iron core provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a rotor core according to an embodiment of the present invention.
In the figure, 1: stator core, 2: stator winding, 3: stator shielding sleeve, 4: rotor shielding sleeve, 5: rotor core, 6: copper bar, 7: rotating shaft, 8: magnetic steel, 51: rotor punching, 511: conductor groove, 512: magnetic bridge, 513: magnetic steel slot, 5131: first magnetic steel groove, 5132 spacing post, 5133: second magnetic steel groove, 5134: spacing step, 5135: rotor clearance groove, 5136: auxiliary groove, 514: and the shaft hole.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Fig. 1 is a schematic structural diagram of an iron core provided in an embodiment of the present invention. Referring to fig. 1, in the present embodiment, the improvement of the core of the asynchronous motor at least includes the structural optimization of the rotor core 5 in the core to convert the asynchronous motor into an asynchronous starting permanent magnet synchronous motor, thereby solving the problems of low efficiency of the asynchronous motor and high cost of the permanent magnet motor with a driver.
Referring to fig. 1, a core in an asynchronous motor may include the following structure: stator core 1 and rotor core 5. Wherein the rotor core 5 can be nested in the stator core 1. A stator winding 2 is provided in the stator core 1.
Specifically, let the inner diameter of the stator core 1 be L1The outer diameter of the rotor core 5 is L2，(L1-L2) The value range of/2 can be set to be 0.8 mm-3 mm.
Fig. 2 is a schematic structural diagram of a rotor core according to an embodiment of the present invention. Referring to fig. 2, the rotor core 5 is formed by laminating a plurality of rotor sheets 51.
The end face of the iron core body is provided with a conductor slot 511, an axle hole 514 and a magnetic steel slot region 513;
the conductor groove 511 is disposed at the edge of the end face and is provided with the copper bar 6, and the shaft hole 514 is disposed at the center of the end face and is used for passing through the rotating shaft 7.
Specifically, in the rotor core 5, T conductor slots 511 may be uniformly distributed on the edge of the end face, where T is a positive integer.
Further, the magnetic steel slot regions 513 are disposed in an annular region formed between the conductor slots 511 and the shaft hole 514, and the plurality of magnetic steel slot regions 513 are distributed in a central symmetry manner.
Specifically, each magnetic steel slot 513 is sequentially provided with a first magnetic steel slot 5131, a second magnetic steel slot 5133 and a rotor clearance slot 5135, and magnetic steel 8 is installed in each of the first magnetic steel slot 5131 and the second magnetic steel slot 5133.
In this embodiment, the iron core is configured in the motor, so that the motor has the characteristics of both a permanent magnet synchronous motor and an asynchronous motor, that is, the asynchronous starting of the permanent magnet synchronous motor is realized. Specifically, the starting process of the motor can be completed by the characteristics of an asynchronous motor, and the steady-state operation process of the motor can be completed by the characteristics of a permanent magnet synchronous motor, so that the motor can be automatically started on the premise of no need of a driver, and the motor can stably operate in a permanent magnet synchronous motor form, thereby greatly improving the efficiency of the steady-state motor.
Furthermore, the structure of the rotor core 5 comprises a squirrel cage conductor structure of the asynchronous motor and a permanent magnet magnetic pole structure of the permanent magnet synchronous motor, so that the asynchronous starting permanent magnet synchronous motor provided with the rotor core 5 can have asynchronous starting capability by means of the squirrel cage conductor structure, a driver does not need to be newly added, efficiency is greatly improved, cost is lowered, and cost of the permanent magnet is only increased.
On the basis of the technical scheme, the connecting part of the first magnetic steel groove 5131 and the second magnetic steel groove 5133 is provided with the limiting column 5132, the second magnetic steel groove 5133 and the rotor clearance groove 5135 are provided with the limiting step 5134, so that the magnetic steel 8 can be conveniently limited, and the installation stability of the magnetic steel 8 is improved.
On the basis of the above technical scheme, when the magnetic steel 8 is installed in the first magnetic steel groove 5131, a magnetic isolation gap exists between the end of the magnetic steel 8 and the end of the first magnetic steel groove 5131. When the magnetic steel 8 is mounted in the second magnetic steel groove 5133, a gap exists between the end of the magnetic steel 8 and the end of the second magnetic steel groove 5133. Specifically, the magnetic isolation gap hardly allows a magnetic field to pass through, so that the magnetic leakage is small, and the magnetic isolation gap has a magnetic isolation effect.
It is noted that the first magnetic steel slot 5131, the second magnetic steel slot 5133, and the rotor clearance slot 5135 may all be arranged to penetrate the entire core body.
On the basis of the above technical solution, one end of each of the two adjacent magnetic steel slots 513, which is used for mounting the magnetic steel 8 in different polarity directions, is close to each other is a rotor clearance slot 5135.
Wherein, the minimum distance between the rotor clearance groove 5135 and the adjacent conductor groove 511 can be set to 0.3mm to 0.8 mm.
Further, taking the example that the number of poles of the asynchronous starting permanent magnet synchronous motor is 2M, M groups of 2 opposite-pole magnetic steels 8 can be arranged in the rotor core 5, and two adjacent groups of magnetic steels 8 are arranged in different polarity directions, where M is a positive integer.
In this embodiment, referring to fig. 1 and fig. 2, taking M as an example for explanation, the magnetic steel 8 with one pair of poles may be disposed in the rotor core 5, that is, the rotor core 5 may be divided into a first region and a second region, and the first region and the second region are respectively used for mounting the magnetic steel 8 with different polarity directions. It is noted that both the first region and the second region may be used to provide at least one magnetic steel slot 513. The more the magnetic steel grooves 513 are, the more the magnetic steel 8 can be installed, and the magnetism can be increased. Wherein, the polarity direction has two kinds: one is that the S pole of the magnetic steel 8 faces the stator core 1, and the N pole faces the shaft hole 514; the other is that the N pole of the magnetic steel 8 faces the stator core 1, and the S pole faces the shaft hole 514.
Referring to fig. 1 and 2, two magnetic steel grooves 513 are provided in each of the first and second regions. The rotor clearance groove 5135 is located at one end of the two adjacent magnetic steel grooves 513 where the magnetic steels 8 with different polarity directions are installed, that is, one end of the first region and the second region which are close to each other.
On the basis of the above technical solution, one end of each of the two adjacent magnetic steel grooves 513, which is used for mounting the magnetic steel 8 in the same polarity direction and is close to each other, is a first magnetic steel groove 5131, and a magnetic bridge 512 is arranged between the two adjacent first magnetic steel grooves 5131.
Specifically, referring to fig. 1 and 2, one end of each of two adjacent magnetic steel grooves 513 in the first region, which is close to each other, is a first magnetic steel groove 5131; similarly, the end of each two adjacent magnetic steel grooves 513 in the second region, which is close to each other, is a first magnetic steel groove 5131.
The magnetic bridge 512 can let a small amount of magnetic field pass through, the smaller the width of the magnetic bridge 512, the less magnetic field it passes through, and the part of the magnetic field that passes through is the leakage part. Illustratively, the width of the magnetic bridge 512 may be set to 0.7mm to 1.5 mm.
Further, the magnetic bridge 512 may increase the structural strength of the rotor core 5 on the one hand; on the other hand, a small amount of magnetic leakage effect can be allowed, the effect is also exerted on the demagnetization magnetic field, namely the effect of the stator demagnetization magnetic field is weakened, and the demagnetization resistance is improved.
Specifically, for the asynchronous starting permanent magnet synchronous motor provided with the iron core, in the starting process, the size of a stator magnetic field is 3-7 times that of a stator magnetic field in steady-state operation, and a rotor needs a higher demagnetization resistance design. The structure of the magnetic bridge 512 arranged in the rotor core 5 can reduce the effect of the stator magnetic field on the magnetic steel 8 in the starting process of the motor and improve the demagnetization resistance of the magnetic steel 8.
In a specific embodiment, the magnetic bridge 512 is disposed at an angle of 100-120 ° with respect to each of the two adjacent magnetic steel slots 513; the first magnetic steel groove 5131 and the second magnetic steel groove 5133 in the same magnetic steel groove region 513 are arranged at an angle of 120-150 degrees.
On the basis of the above technical solution, the iron core further includes: the auxiliary groove 5136. The auxiliary grooves 5136 are distributed in the outer sides of the first magnetic steel groove 5131 and the second magnetic steel groove 5133, and are respectively located at the corner positions in one side of the corresponding magnetic steel 8, so that the demagnetization resistance of the corner of the magnetic steel 8 can be effectively improved.
In this embodiment, an asynchronous starting permanent magnet synchronous motor is further provided, and the motor includes, for example, a stator core 1, a rotor core 5, a stator shielding sleeve 3, and a rotor shielding sleeve 4 according to any one of the above technical solutions. Wherein, stator shield 3 and rotor shield 4 set up between stator core 1 and rotor core 5.
Further, the stator shielding 3 may be made of a metal material or a plastic material.
When the stator shielding sleeve 3 is made of metal material, the thickness range can be set to be 0.3 mm-0.5 mm; when the stator shielding sleeve 3 is made of plastic material, the thickness range can be set to 1.2 mm-2.2 mm.
When the rotor shielding sleeve 4 is made of metal, the thickness can be set to 0.15 mm-0.3 mm.
In this embodiment, a canned motor pump is further provided, where the canned motor pump includes the asynchronous starting permanent magnet synchronous motor described in the above technical solution.
Although the invention has been described in detail hereinabove by way of general description, specific embodiments and experiments, it will be apparent to those skilled in the art that many modifications and improvements can be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A rotor core, characterized in that,
the rotor core is formed by laminating a plurality of rotor punching sheets;
the end face of the iron core body is provided with a conductor groove, an axle hole and a magnetic steel groove area;
the conductor groove is arranged at the edge of the end face and is provided with a copper bar;
the shaft hole is arranged in the center of the end face and is used for penetrating through the rotating shaft;
the magnetic steel slot regions are arranged in an annular region formed between the conductor slots and the shaft hole, and the magnetic steel slot regions are distributed in a centrosymmetric manner;
a first magnetic steel groove, a second magnetic steel groove and a rotor clearance groove are sequentially arranged in each magnetic steel groove;
and magnetic steels are arranged in the first magnetic steel groove and the second magnetic steel groove.
2. The rotor core according to claim 1, wherein a limiting column is arranged at the joint of the first magnetic steel groove and the second magnetic steel groove, and a limiting step is arranged between the second magnetic steel groove and the rotor clearance groove.
3. The rotor core according to claim 1, wherein when the magnetic steel is mounted in the first magnetic steel slot, a gap exists between an end of the magnetic steel and an end of the first magnetic steel slot;
when the magnetic steel is arranged in the second magnetic steel groove, a magnetic isolation gap is formed between the end part of the magnetic steel and the end part of the second magnetic steel groove.
4. The rotor core of claim 1 wherein the rotor clearance slot is at the end of two adjacent magnetic steel slots that are adjacent to each other for mounting magnetic steel of different polarity directions.
5. The rotor core according to claim 1, wherein one end of two adjacent magnetic steel slots for mounting the magnetic steel in the same polarity direction, which is close to each other, is the first magnetic steel slot, and a magnetic bridge is disposed between the two adjacent first magnetic steel slots.
6. The rotor core according to claim 5, wherein the magnetic bridges are disposed at 100 ° -120 ° to each of two adjacent magnetic steel slots;
the first magnetic steel groove and the second magnetic steel groove in the same magnetic steel groove domain are arranged at an angle of 120-150 degrees.
7. The rotor core of claim 1, further comprising: an auxiliary groove;
the auxiliary grooves are distributed on the outer sides of the first magnetic steel groove and the second magnetic steel groove and are respectively located at corresponding corner positions in one side of the magnetic steel.
8. An asynchronous starting permanent magnet synchronous motor, characterized in that, including stator core, the rotor core of any of claims 1-7, stator shielding cover, rotor shielding cover, stator shielding cover and rotor shielding cover are established between stator core and rotor core.
9. An asynchronously starting permanent magnet synchronous motor according to claim 8,
the stator shielding sleeve is made of metal materials or plastic materials, and the rotor shielding sleeve is made of metal materials.
10. A canned motor pump comprising an asynchronously started permanent magnet synchronous motor as claimed in any of claims 8 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011209186.3A CN112653268A (en) | 2020-11-03 | 2020-11-03 | Rotor core, asynchronous starting permanent magnet synchronous motor and canned motor pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011209186.3A CN112653268A (en) | 2020-11-03 | 2020-11-03 | Rotor core, asynchronous starting permanent magnet synchronous motor and canned motor pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112653268A true CN112653268A (en) | 2021-04-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011209186.3A Pending CN112653268A (en) | 2020-11-03 | 2020-11-03 | Rotor core, asynchronous starting permanent magnet synchronous motor and canned motor pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112653268A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601485A (en) * | 2019-09-23 | 2019-12-20 | 上海电气集团上海电机厂有限公司 | Self-starting permanent magnet motor |
| CN114498982A (en) * | 2021-12-24 | 2022-05-13 | 珠海格力电器股份有限公司 | Rotor core, rotor subassembly and have its motor |
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| CN111614210A (en) * | 2020-05-28 | 2020-09-01 | 沈阳工业大学 | Low-eddy-current-loss high-efficiency canned motor pump |
| CN111769668A (en) * | 2020-07-09 | 2020-10-13 | 精进电动科技股份有限公司 | Built-in permanent magnet motor rotor structure |
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| CN1734884A (en) * | 2005-07-27 | 2006-02-15 | 沈阳工业大学 | Permanent magnet synchronous motor for shielded pump |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601485A (en) * | 2019-09-23 | 2019-12-20 | 上海电气集团上海电机厂有限公司 | Self-starting permanent magnet motor |
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| CN114498982A (en) * | 2021-12-24 | 2022-05-13 | 珠海格力电器股份有限公司 | Rotor core, rotor subassembly and have its motor |
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Application publication date: 20210413 |