CN110912307A - Brushless motor rotor magnetic steel structure - Google Patents
Brushless motor rotor magnetic steel structure Download PDFInfo
- Publication number
- CN110912307A CN110912307A CN201911414303.7A CN201911414303A CN110912307A CN 110912307 A CN110912307 A CN 110912307A CN 201911414303 A CN201911414303 A CN 201911414303A CN 110912307 A CN110912307 A CN 110912307A
- Authority
- CN
- China
- Prior art keywords
- magnetic steel
- magnet steel
- rotor core
- rotor
- steel
- 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
Links
Images
Classifications
-
- 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
- H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
- H02K1/2733—Annular magnets
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Brushless Motors (AREA)
Abstract
The invention discloses a brushless motor rotor magnetic steel structure, which comprises a rotating shaft, a rotor core and magnetic steel, wherein the rotating shaft, the rotor core and the magnetic steel are coaxially arranged, the rotating shaft penetrates through a shaft hole of the rotor core, the magnetic steel is sleeved outside the rotor core and is annular, a magnetic steel cover is arranged between the magnetic steel and the rotating shaft and is in clearance fit with the magnetic steel, the magnetic steel cover is in close fit with the rotating shaft, steps are arranged at the positions of the rotor core and the magnetic steel cover, which are in contact with the magnetic steel, so as to fix the magnetic steel, one ends of the rotor core and the magnetic steel cover, which are not in contact with the magnetic steel, are connected with a bearing, and the bearing is sleeved on the rotating shaft.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a magnetic steel structure of a rotor of a brushless motor.
Background
Brushless motors are electronically commutated using semiconductor switching devices, i.e., electronic switching devices are used to replace conventional contact commutators and brushes. The device has the advantages of high reliability, no reversing spark, low mechanical noise and the like, and is widely applied to high-grade recording seats, video recorders, electronic instruments and automatic office equipment. The magnetic steel is used as a part of a magnetic circuit of the brushless motor, and a controller supplies a variable frequency power supply to the coil to generate a magnetic field to drive the motor to operate.
In the prior art, the magnetic steel is of a split-type structure, the split-type structure needs injection molding, the magnetic steel is easy to crack due to high temperature during injection molding, glue is needed to be pasted on a rotor core during split-type structure, the glue is a chemical substance and has pungent smell and certain harm to a human body, and the magnetic steel needs to be fixed by a clamp in multiple processes, so that the outer circumferential surface of the magnetic steel is on the same circumference as much as possible to ensure that a stator and a rotor have uniform air gaps, and a rotor assembly (the rotor core and the magnetic steel) needs to be placed in an oven at high temperature for 30 minutes to 1 hour to accelerate the firm adhesion of the glue. In addition, when the brushless motor complete machine is used for a cold and hot impact reliability test, the magnetic steel and the rotor core are tightly attached together, the magnetic steel and the rotor core have different thermal expansion coefficients, the temperature is reduced or increased, and the magnetic steel is easy to crack.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcome above prior art's defect, provide a magnetic field stability, cooperation precision is high, convenient assembly, more durable brushless motor rotor magnet steel structure.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a brushless motor rotor magnet steel structure, includes pivot, rotor core and the magnet steel of coaxial setting, the shaft hole of rotor core is passed in the pivot, and the magnet steel is established to the rotor core overcoat, the magnet steel be cyclic annular magnet steel and pivot between set up the magnet steel lid, magnet steel lid and magnet steel clearance fit, magnet steel lid and pivot tight fit, rotor core and magnet steel lid set up the step at the position that contacts with the magnet steel to fixed magnet steel, rotor core and magnet steel lid are not connected with the one end that the magnet steel contacted with the bearing, the bearing housing establish in the pivot.
In order to facilitate assembly and be firmer, the end surfaces of the rotor core and the magnetic steel cover, which are contacted with the bearing, are provided with salient points, and the corresponding positions on the bearing are provided with concave points matched with the salient points.
Furthermore, the root diameter of the salient point is 1.5 mm.
Furthermore, the outer diameter of the magnetic steel cover in clearance fit with the magnetic steel is slightly smaller than the inner diameter of the magnetic steel.
Further, the inner diameter of the magnetic steel is set as
The outer diameter of the magnetic steel cover is set as
Preferably, the magnetic steel cover is machined to improve the matching precision.
The invention discloses a magnetic steel structure of a brushless motor rotor, which has the beneficial effects that: the magnetic steel is in an integral ring type, so that the size and form and position tolerance of the inner and outer ring surfaces are easy to control, and the processing precision is very high; the magnetic steel is fixed on the rotor core without an injection mould and is directly sleeved on the rotor core, the inner diameter of the magnetic steel is in clearance fit with the outer diameter of the magnetic steel cover, the magnetic steel is positioned in the axial direction and the radial direction by the magnetic steel cover, the crack phenomenon is avoided, when a cold and hot impact reliability test is carried out, a space is reserved during thermal expansion, the magnetic steel is not cracked, the air gap between the stator and the rotor is uniform, the magnetic field is stable, the noise is low, the vibration is small, and the efficiency is high; the salient points on the magnetic ring cover are convenient to assemble and firmer.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a side view of the shaft in cooperation with a rotor core;
FIG. 3 is a sectional view taken along line A-A of FIG. 2
FIG. 4 is a schematic structural diagram of magnetic steel;
FIG. 5 is a schematic structural view of a magnetic steel cover;
in the figure, 1 is a bearing, 2 is a rotating shaft, 3 is a rotor core, 4 is magnetic steel, 5 is a magnetic steel cover, and 6 is salient points.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1, 2 a brushless motor rotor magnet steel structure, pivot 2 including coaxial setting, rotor core 3 and magnet steel 4, pivot 2 passes rotor core 3's shaft hole, magnet steel 4 is established to 3 overcoat of rotor core, magnet steel 4 is cyclic annular, set up magnet steel lid 5 between magnet steel 4 and pivot 2, magnet steel lid 5 and magnet steel 4 clearance fit, magnet steel lid 5 and pivot 2 tight fit, rotor core 3 and magnet steel lid 5 set up the step at the position that contacts with magnet steel 4, with fixed magnet steel 4, rotor core 3 and the one end that magnet steel lid 5 does not contact with magnet steel 4 are connected with bearing 1, bearing 1 cover is established on pivot 2.
Salient points 6 are arranged on the end faces, contacting with the bearing 1, of the rotor core 3 and the magnetic steel cover 5, concave points matched with the salient points 6 are arranged at corresponding positions on the bearing 1, and the diameter of the root parts of the salient points 6 is 1.5 mm.
The outer diameter of the magnetic steel cover 5 in clearance fit with the magnetic steel 4 is slightly smaller than the inner diameter of the magnetic steel 4.
The inner diameter of the magnetic steel 4 is set as
The outer diameter of the magnetic steel cover 5 is set as
The magnetic steel cover 5 is machined to improve matching accuracy.
According to the brushless motor rotor magnetic steel structure, the magnetic steel is of an integral ring type, and the dimensions and form and position tolerances of the inner and outer ring surfaces are easy to control due to the integral structure, so that the brushless motor rotor magnetic steel structure has high machining precision; the magnetic steel is fixed on the rotor core without an injection mould and is directly sleeved on the rotor core, the inner diameter of the magnetic steel is in clearance fit with the outer diameter of the magnetic steel cover, the magnetic steel is positioned in the axial direction and the radial direction by the magnetic steel cover, the crack phenomenon is avoided, when a cold and hot impact reliability test is carried out, a space is reserved during thermal expansion, the magnetic steel is not cracked, the air gap between the stator and the rotor is uniform, the magnetic field is stable, the noise is low, the vibration is small, and the efficiency is high; the salient points on the magnetic ring cover are convenient to assemble and firmer.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (6)
1. The utility model provides a brushless motor rotor magnet steel structure, characterized by: including pivot (2), rotor core (3) and magnet steel (4) of coaxial setting, the shaft hole of rotor core (3) is passed in pivot (2), and magnet steel (4) are established to rotor core (3) overcoat, magnet steel (4) be cyclic annular magnet steel (4) and pivot (2) between set up magnet steel lid (5), magnet steel lid (5) and magnet steel (4) clearance fit, magnet steel lid (5) and pivot (2) tight fit, rotor core (3) and magnet steel lid (5) set up the step at the position that contacts with magnet steel (4) to fixed magnet steel (4), the one end that rotor core (3) and magnet steel lid (5) do not contact with magnet steel (4) is connected with bearing (1), bearing (1) cover establish in pivot (2).
2. The magnetic steel structure of the rotor of the brushless motor as claimed in claim 1, wherein: rotor core (3) and magnet steel lid (5) set up bump (6) at the terminal surface that contacts with bearing (1), corresponding position sets up the pit with bump (6) matched with on bearing (1).
3. The magnetic steel structure of the rotor of the brushless motor as claimed in claim 2, wherein: the root diameter of the salient point (6) is 1.5 mm.
4. The magnetic steel structure of the rotor of the brushless motor as claimed in claim 1, wherein: the outer diameter of the clearance fit between the magnetic steel cover (5) and the magnetic steel (4) is slightly smaller than the inner diameter of the magnetic steel (4).
5. The rotor magnetic steel structure of the brushless motor as claimed in claim 4, wherein: the inner diameter of the magnetic steel (4) is set as
The outer diameter of the magnetic steel cover (5) is set as
6. The magnetic steel structure of the rotor of the brushless motor as claimed in claim 1, wherein: the magnetic steel cover (5) is machined to improve matching precision.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911414303.7A CN110912307A (en) | 2019-12-31 | 2019-12-31 | Brushless motor rotor magnetic steel structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911414303.7A CN110912307A (en) | 2019-12-31 | 2019-12-31 | Brushless motor rotor magnetic steel structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110912307A true CN110912307A (en) | 2020-03-24 |
Family
ID=69814030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911414303.7A Pending CN110912307A (en) | 2019-12-31 | 2019-12-31 | Brushless motor rotor magnetic steel structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110912307A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114759699A (en) * | 2022-04-06 | 2022-07-15 | 江苏三江电器集团股份有限公司 | Plastic package BLDC clothes dryer motor |
-
2019
- 2019-12-31 CN CN201911414303.7A patent/CN110912307A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114759699A (en) * | 2022-04-06 | 2022-07-15 | 江苏三江电器集团股份有限公司 | Plastic package BLDC clothes dryer motor |
| CN114759699B (en) * | 2022-04-06 | 2022-11-25 | 江苏三江电器集团股份有限公司 | Plastic package BLDC clothes dryer motor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5372629B2 (en) | Brushless motor | |
| US10608494B2 (en) | Stator unit, motor, and method of manufacturing stator unit | |
| JP2007295666A (en) | Brushless motor | |
| US10855134B2 (en) | Motor and air conditioning apparatus | |
| JP2009303473A (en) | Motor and fan using the motor | |
| WO2020062479A1 (en) | Electric blower | |
| CN110912307A (en) | Brushless motor rotor magnetic steel structure | |
| CN210957954U (en) | Brushless motor rotor magnetic steel structure | |
| JP2001050278A (en) | Manufacture of dynamic-pressure bearing device, and dynamic-pressure bearing device | |
| JP2010124647A (en) | Motor, fan, method of manufacturing the motor, and method of manufacturing the fan | |
| JP2005198483A (en) | Brushless direct-current motor | |
| CN201439767U (en) | DC motor with cup-shaped stator and DC fan consisting of the motor | |
| CN101892996B (en) | DC motor with cup-shaped stator and DC fan formed by same | |
| JP2015081572A (en) | Manufacturing method of fuel pump | |
| US20200309191A1 (en) | Gas dynamic pressure bearing, motor, and fan motor | |
| JP2019110679A (en) | Rotor of rotary electric machine, rotary electric machine, and blower | |
| JP2019027522A (en) | Bearing assembly, motor, assembly method for bearing assembly | |
| JP5729439B2 (en) | Brushless motor | |
| CN219107247U (en) | Motor | |
| CN104753266A (en) | Motor rotor assembling process | |
| KR101196583B1 (en) | Spindle motor | |
| CN219372114U (en) | Outer rotor DC brushless two-gear micro motor | |
| KR102502683B1 (en) | Manufacturing method of housing for small size motor module | |
| WO2008056749A1 (en) | Motor, method for manufacturing the motor, and blower fan using the motor | |
| JP2006325365A (en) | Stator partially formed of non-magnetic body and brushless motor using same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |