CN110676961A - Permanent magnet motor rotor for inhibiting magnetic leakage of magnetic isolation bridge - Google Patents
Permanent magnet motor rotor for inhibiting magnetic leakage of magnetic isolation bridge Download PDFInfo
- Publication number
- CN110676961A CN110676961A CN201910910299.7A CN201910910299A CN110676961A CN 110676961 A CN110676961 A CN 110676961A CN 201910910299 A CN201910910299 A CN 201910910299A CN 110676961 A CN110676961 A CN 110676961A
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- CN
- China
- Prior art keywords
- magnetic
- rotor
- permanent magnet
- bridge
- leakage
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- 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.)
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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
-
- 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
Abstract
The invention discloses a permanent magnet motor rotor for inhibiting flux leakage of a magnetic isolation bridge, which comprises a rotor body, wherein a plurality of rotor permanent magnets of poles are distributed on the rotor body, and magnetic fields under each pole are opposite in sequence; the inner diameter end of the rotor permanent magnet of each pole is provided with a magnetic isolation bridge, a coil with a certain number of turns is wound on the magnetic isolation bridge of each pole, the coils under different poles are connected in series or in parallel, and constant direct current is introduced. When constant direct current is introduced into the coil on the magnetism isolating bridge, a constant magnetic field is induced at the magnetism isolating bridge, the direction of the induced magnetic field is opposite to the direction of the leakage magnetic field of the permanent magnet passing through the magnetism isolating bridge, and the magnetic fields are mutually offset, so that the strength of the leakage magnetic field at the magnetism isolating bridge is reduced. The permanent magnet motor rotor for inhibiting the magnetic leakage of the magnetic isolation bridge can obviously inhibit the magnetic leakage of the permanent magnet field of the rotor through the magnetic isolation bridge while increasing the thickness of the magnetic isolation bridge to improve the mechanical strength, reduces the magnetic flux leakage density at the magnetic isolation bridge and increases the utilization rate of the permanent magnet.
Description
Technical Field
The invention relates to a permanent magnet motor rotor, in particular to a permanent magnet motor rotor for inhibiting flux leakage of a magnetic isolation bridge.
Background
In the existing permanent magnet motor rotor, most of the existing permanent magnet motor rotors have a thinner silicon steel sheet structure, and the structure is called as a magnetic isolation bridge in the motor professional term. The magnetic isolation bridge is thick, the safety coefficient of the rotor is high, the mechanical strength of the rotor is high, and the punching sheet is not easy to break under high rotating speed and high torque; however, the thicker magnetic isolation bridge means that the proportion of the permanent magnetic field of the rotor passing through the magnetic isolation bridge is high, the magnetic leakage of the motor is large, the utilization rate of the permanent magnet is reduced, and the cost of the motor is improved. Therefore, simply increasing the mechanical strength of the rotor by increasing the thickness of the magnetic isolation bridge brings about a disadvantage of increasing the magnetic flux leakage.
The design of the thickness of the magnetic isolation bridge in the prior art can only find balance between the strength of the rotor and the magnetic leakage, and the magnetic leakage cannot be inhibited while the thickness of the magnetic isolation bridge is increased to improve the mechanical strength.
Disclosure of Invention
The invention aims to: provided is a permanent magnet motor rotor capable of remarkably suppressing the leakage flux of a permanent magnet field of the rotor through a magnetic isolation bridge while increasing the thickness of the magnetic isolation bridge to improve the mechanical strength.
The technical scheme of the invention is as follows:
a permanent magnet motor rotor for inhibiting flux leakage of a magnetic isolation bridge comprises a rotor body consisting of rotor punching sheets, wherein a plurality of rotor permanent magnets of poles are distributed on the rotor body, and magnetic fields under each pole are opposite in sequence; the inner diameter end of the rotor permanent magnet of each pole is provided with a magnetic isolation bridge, a coil with a certain number of turns is wound on the magnetic isolation bridge of each pole, the coils under different poles are connected in series or in parallel, and constant direct current is introduced.
Preferably, when a constant direct current is introduced into the coil on the magnetic isolation bridge, a constant magnetic field is induced at the magnetic isolation bridge, the direction of the induced magnetic field is opposite to the direction of the leakage magnetic field of the permanent magnet passing through the magnetic isolation bridge, and the magnetic fields of the induced magnetic field and the leakage magnetic field are mutually offset, so that the strength of the leakage magnetic field at the magnetic isolation bridge is reduced.
Preferably, the rotor body formed by the rotor punching sheets is of a non-segmented straight pole structure, and the magnetic isolation bridges are aligned in the axial direction.
Preferably, the direction of the induced magnetic field is opposite to the direction of the leakage magnetic field of the permanent magnet passing through the magnetic separation bridge by setting the winding direction of the winding.
Preferably, paired magnetic steel grooves are distributed on the rotor body, equidirectional rotor permanent magnets are installed in the paired magnetic steel grooves to form one pole of the permanent magnet motor rotor, and the directions of the rotor permanent magnets of two adjacent poles are opposite.
Preferably, the magnetic isolation bridge is arranged between the inner diameter ends of the two magnetic steel slots of the same pole.
The invention has the advantages that:
the permanent magnet motor rotor for inhibiting the magnetic leakage of the magnetic isolation bridge can obviously inhibit the magnetic leakage of the permanent magnet field of the rotor through the magnetic isolation bridge while increasing the thickness of the magnetic isolation bridge to improve the mechanical strength. The magnetic leakage flux density at the magnetic isolation bridge is reduced, and the utilization rate of the permanent magnet is increased. Through the embodiment of this patent can reduce magnetic flux leakage magnetic density in magnetic isolation bridge department, consequently the thickness of magnetic isolation bridge can be widened, has strengthened the mechanical strength of rotor.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a schematic structural diagram of a permanent magnet motor rotor for suppressing flux leakage of an isolation bridge in an embodiment;
FIG. 2 is a schematic structural diagram of a rotor of a permanent magnet motor in an embodiment;
FIG. 3 is a magnetic flux density distribution diagram of a motor when the motor is unloaded without implementing the scheme of the invention;
fig. 4 is a magnetic flux density distribution diagram of the motor when the motor is unloaded when the scheme of the invention is implemented.
Detailed Description
As shown in fig. 1, the permanent magnet motor rotor for suppressing magnetic leakage of the magnetic isolation bridge of the invention comprises a rotor body 1 composed of rotor punching sheets, wherein paired magnetic steel slots are distributed on the rotor body, and rotor permanent magnets 2 in the same direction are installed in the paired magnetic steel slots to form one pole of the permanent magnet motor rotor, and the directions of the rotor permanent magnets of two adjacent poles are opposite; the inner diameter ends of the two rotor permanent magnets of each pole are provided with a magnetic isolation bridge 3, the magnetic isolation bridge of each pole is wound with a coil 4 with a certain number of turns, the coils under different poles are connected in a series or parallel connection mode, and constant direct current is introduced, so that a constant magnetic field is induced at the magnetic isolation bridge in the coil, and the direction of the induced magnetic field is opposite to the direction of the leakage magnetic field of the permanent magnets passing through the magnetic isolation bridge. The magnetic fields of the two are mutually offset, so that the intensity of a leakage magnetic field at the magnetic isolation bridge is reduced.
The specific implementation process of the scheme of the invention comprises the following steps:
step 1: the rotor body formed by the rotor punching sheets is of a non-segmented straight pole structure, and the magnetic isolation bridges are aligned in the axial direction, so that winding on the magnetic isolation bridges is facilitated. As shown in fig. 2.
Step 2: the magnetic isolation bridge under each pole is wound with a coil with a certain number of turns, the coils under different poles are connected in a series or parallel connection mode, constant direct current is introduced, the direct current induces a constant magnetic field at the magnetic isolation bridge in the coil, and the direction of the induced magnetic field is opposite to the direction of a leakage magnetic field of the permanent magnet passing through the magnetic isolation bridge by setting the winding direction of the winding. The magnetic fields of the two are mutually counteracted, so that the intensity of the leakage magnetic field at the magnetic isolation bridge is reduced, as shown in figure 1.
Referring to fig. 3, it can be seen that the magnetic flux density distribution diagram of the motor when the motor is not in load according to the patent scheme shows that the magnetic field of the magnetic isolation bridge is saturated, and the average magnetic flux density of the magnetic isolation bridge reaches 1.85T. As shown in FIG. 4, the no-load average flux density at the magnetic isolation bridge is reduced to 0.4T after the patent is implemented. The magnetic leakage of the motor is obviously reduced. The number of turns of the dc coil wound at the magnetic isolation bridge and the current applied is, depending on the motor implementation, 10 turns here, 45A. When constant direct current is introduced into the coil on the magnetism isolating bridge, a constant magnetic field is induced at the magnetism isolating bridge, the direction of the induced magnetic field is opposite to the direction of the leakage magnetic field of the permanent magnet passing through the magnetism isolating bridge, and the magnetic fields are mutually offset, so that the strength of the leakage magnetic field at the magnetism isolating bridge is reduced.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All modifications made according to the spirit of the main technical scheme of the invention are covered in the protection scope of the invention.
Claims (6)
1. A permanent magnet motor rotor for inhibiting flux leakage of a magnetic isolation bridge comprises a rotor body consisting of rotor punching sheets, wherein a plurality of rotor permanent magnets of poles are distributed on the rotor body, and magnetic fields under each pole are opposite in sequence; the permanent magnet motor is characterized in that a magnetic isolation bridge is arranged at the inner diameter end of the rotor permanent magnet of each pole, a coil with a certain number of turns is wound on the magnetic isolation bridge of each pole, the coils under different poles are connected in a series or parallel connection mode, and constant direct current is introduced.
2. The permanent magnet motor rotor for suppressing the magnetic leakage of the magnetic isolation bridge as claimed in claim 1, wherein when a constant direct current is applied to the coils of the magnetic isolation bridge, a constant magnetic field is induced at the magnetic isolation bridge, the direction of the induced magnetic field is opposite to the direction of the magnetic leakage field of the permanent magnet passing through the magnetic isolation bridge, and the magnetic fields of the induced magnetic field and the magnetic leakage field cancel each other out, so that the intensity of the magnetic leakage field at the magnetic isolation bridge is reduced.
3. The permanent magnet motor rotor for suppressing flux leakage of the flux-isolating bridge as claimed in claim 2, wherein the rotor body formed by the rotor sheets is of a straight pole structure without segmentation, and the flux-isolating bridge is aligned in the axial direction.
4. The rotor for a permanent magnet motor suppressing flux leakage of a flux barrier according to claim 3, wherein the direction of the induced magnetic field is opposite to the direction of the magnetic flux leakage field of the permanent magnet passing through the flux barrier by setting the winding direction of the winding, in the constant magnetic field induced by the coil on the flux barrier of each pole at the flux barrier.
5. The permanent magnet motor rotor for suppressing flux leakage of the flux-isolating bridge as claimed in claim 1, wherein the rotor body is distributed with paired magnetic steel slots, and the paired magnetic steel slots are provided with equidirectional rotor permanent magnets to form one pole of the permanent magnet motor rotor, and the directions of the rotor permanent magnets of two adjacent poles are opposite.
6. The permanent magnet motor rotor for suppressing flux leakage of the flux barrier bridge as set forth in claim 5, wherein said flux barrier bridge is disposed between inner diameter ends of two magnetic steel slots of the same pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910910299.7A CN110676961A (en) | 2019-09-25 | 2019-09-25 | Permanent magnet motor rotor for inhibiting magnetic leakage of magnetic isolation bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910910299.7A CN110676961A (en) | 2019-09-25 | 2019-09-25 | Permanent magnet motor rotor for inhibiting magnetic leakage of magnetic isolation bridge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110676961A true CN110676961A (en) | 2020-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910910299.7A Pending CN110676961A (en) | 2019-09-25 | 2019-09-25 | Permanent magnet motor rotor for inhibiting magnetic leakage of magnetic isolation bridge |
Country Status (1)
| Country | Link |
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| CN (1) | CN110676961A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102067412A (en) * | 2008-06-20 | 2011-05-18 | 株式会社东芝 | Permanent magnet type rotating electric machine |
| JP2013162612A (en) * | 2012-02-03 | 2013-08-19 | Suzuki Motor Corp | Electric rotary machine |
-
2019
- 2019-09-25 CN CN201910910299.7A patent/CN110676961A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102067412A (en) * | 2008-06-20 | 2011-05-18 | 株式会社东芝 | Permanent magnet type rotating electric machine |
| JP2013162612A (en) * | 2012-02-03 | 2013-08-19 | Suzuki Motor Corp | Electric rotary machine |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200110 |
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| RJ01 | Rejection of invention patent application after publication |