CN201352733Y - Permanent-magnet motor with rotor magnetic steel with dovetail groove structure - Google Patents
Permanent-magnet motor with rotor magnetic steel with dovetail groove structure Download PDFInfo
- Publication number
- CN201352733Y CN201352733Y CNU2009201137241U CN200920113724U CN201352733Y CN 201352733 Y CN201352733 Y CN 201352733Y CN U2009201137241 U CNU2009201137241 U CN U2009201137241U CN 200920113724 U CN200920113724 U CN 200920113724U CN 201352733 Y CN201352733 Y CN 201352733Y
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- dovetail groove
- magnetic steel
- permanent
- groove
- magnet motor
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The utility model provides a permanent-magnet motor with rotor magnetic steel with a dovetail groove structure in order to reduce the tooth socket detent torque of the permanent-magnet motor. The rotor surface of the permanent-magnet motor is provided with a plurality of pasted tile-type magnetic steel. The permanent-magnet motor is characterized in that the edge of one side of each tile-type magnetic steel is provided with dovetail grooves; the symmetrical position on the edge of the other side thereof is provided with dovetail groove tongues which are matched with the dovetail grooves; and the dovetail groove tongue of each tile-type magnetic steel is inserted into the dovetail groove adjacent to the tile-type magnetic steel. By arranging the dovetail groove structure on the magnetic steel, the detent torque of the permanent-magnet motor is reduced by about 50%, so as to lead the permanent-magnet motor to have low torque fluctuation; the accurate positioning running and better low-speed running property are ensured; and the production process can be realized easily.
Description
Technical field
The utility model relates to the magneto technical field, specifically, relates to the magneto that a kind of rotor magnetic steel has trapezoid groove structure.
Background technology
Do not have the increase of application such as bearing blood pump motor drive system along with the artificial heart magnetic suspension of permanent-magnet brushless DC electric machine in high-performance occasion such as robot, marine propellers drive system, high-precision numerical control machine servo system and biomedical engineering, the cogging torque minimization technique seems and becomes more and more important.No matter be design Optimization of Brushless Direct Current Motor, still it carried out the pulsation analysis of torque, all must consider the influence of cogging torque.
The teeth groove location torque is the intrinsic phenomenon of permanent-magnetic electric machine, permanent magnet synchronous motor three phase winding no powers, and under the situation of winding open circuit, during with the light rotary rotor of have gentle hands, can feel the torque that has certain effect on the rotor, this torque size in a circle scope is inhomogeneous, and can find some anchor points, promptly be positioned at these points at the nature lower rotor part, only under certain extraneous torque, could change the position of rotor location, Just because of this, usually the torque of rotary rotor under permanent magnet motor no power and the winding open circuit situation be called location (detent) torque.The rotor that is magneto has a kind of trend of aliging with stator along a certain specific direction, and trend can produce a kind of vibration torque thus, is also referred to as cogging torque.
The generation of teeth groove location torque comes from the tangential force between rotor permanent magnet and the stator tooth, is rotor permanent magnet and stator teeth groove results of interaction.It produces the existence that mainly comes from the stator teeth groove, the relative position of the magnetic pole of p-m rotor and stator teeth groove is not simultaneously, the magnetic conductance of main magnetic circuit is different, p-m rotor trend is positioned the position of magnetic conductance maximum, i.e. stable equilibrium point, and electromagnetic torque is zero, depart from the effect torque that Shi Douyou is returned to this position, or be tending towards another adjacent stable equilibrium point, and the action direction of visible torque is an alternation, usually said location torque is meant the alternation amplitude.Motor revolves and turns around, the periodicity of torque alternation, i.e. and stable equilibrium position number, more situation equals stator tooth (groove) number.Location torque mainly comes from the stator teeth groove, so also be called teeth groove (cogging) torque, perhaps extensively some are called the teeth groove location torque to implication.
In general, in permanent magnet motor, cogging usually becomes the fundamental cause that causes vibration, noise and raising control precision difficulty.In variable speed drives, when torque frequency is consistent with the mechanical resonance frequency of stator or rotor, vibration and noise that cogging torque produces will be exaggerated.The existence of cogging torque has influenced the low-speed performance of motor in speed control system and the hi-Fix in position control system equally.
Fall the low location torque of teeth groove at present and mainly contain following several method:
1, magnetic slot-seal method:
Adopting magnetic slot-seal is exactly to be coated with to press one deck magnetic slot mud on the stator rabbet of motor, solidifies the back and forms the slot wedge with certain magnetic property.The main component of magnetic slot mud is high-purity iron powder and high viscosity resins, and its magnetic permeability with respect to air is generally 2-5.Magnetic slot-seal has reduced the influence of stator slot opening, makes the air-gap permeance distribution between stator and rotor more even, thereby can reduce because the torque pulsation that teeth groove causes.Yet it is because the magnetic property of magnetic slot-seal material is not fine, thereby limited for the weakening degree of torque pulsation.
2, the channel process of remaining silent:
The employing groove of remaining silent is a not opening of stator slot, and the notch material is identical with tooth portion material.Because of the magnetic property of notch better, so can eliminate torque pulsation though the groove of remaining silent can more effectively be eliminated the torque groove of remaining silent than magnetic slot-seal, yet bring great inconvenience for the winding rule.Simultaneously, increase slot leakage reactance greatly after adopting the groove of remaining silent, increased the time constant of circuit, will influence the dynamic characteristic of electric machine control system.
3, mark channel process:
When the several timings of rotor magnetic steel, stator adopts fractional-slot to improve the least common multiple of stator fluting number and rotor magnetic steel number, that is has improved the frequency of cogging torque first-harmonic.Like this, cogging torque can descend equally, yet meanwhile, the average torque of motor has also descended, and this is because adopted behind the fractional-slot each extremely descend the winding distribution asymmetric and make the effective torque component of motor offset a part.
4, skewed slot method:
The skewed stator slot method is the method for the most traditional reduction cogging torque, and its mechanism and mark channel process have similar part.With stator slot stator slot distance of skew vertically, can eliminate the torque fluctuations that teeth groove causes effectively.Skewed stator slot generally can influence the groove area that accounts for of conductor in the skewed slot method, thereby copper loss is increased.And skewed stator slot brings unacceptable difficulty for sometimes the manufacturing of motor.The permanent-magnet brushless DC electric machine of, minor axis less for the groove number or non-overlapping winding is inapplicable.In addition, the cost of skewed slot is to make the structure of motor be tending towards complicated, and has reduced the output torque of motor to a certain extent.
The utility model content
The purpose of this utility model is in order to reduce the teeth groove location torque of magneto, to provide a kind of rotor magnetic steel to have the magneto of trapezoid groove structure.
The technical problem that the utility model solved can realize by the following technical solutions:
A kind of rotor magnetic steel has the magneto of trapezoid groove structure, described permanent magnet machine rotor surface is provided with the tile type magnet steel of a plurality of Surface Mounts, it is characterized in that: a lateral edges of described each tile type magnet steel is provided with dovetail groove, symmetry place, opposite side edge is provided with the trapezoidal groove and tongue that can cooperate with dovetail groove, and the trapezoidal groove and tongue of each tile type magnet steel all inserts in the dovetail groove of adjacent tiles style magnet steel.
In the utility model, insert in the dovetail groove of adjacent tiles formula magnet steel for the ease of the trapezoidal groove and tongue of tile type magnet steel, the inwall ecto-entad of described dovetail groove tilts.
The turning of the turning of described tile type magnet steel, the turning of dovetail groove, trapezoidal groove and tongue is the circular arc chamfering structure.
The utility model has reduced about 50% by the location torque that the trapezoid groove structure magneto is set at rotor magnetic steel, make magneto have the low torque fluctuation, guarantee its accurate positioning trip and low cruise characteristic preferably, and on production technology, also be easy to realize.
Description of drawings
Fig. 1 is the structural representation of the utility model permanent magnet machine rotor.
Fig. 2 is the structural representation of tile type magnet steel.
Fig. 3 is the upward view of Fig. 2.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
Other structures of permagnetic synchronous motor of the present utility model are similar to general magneto, and are not major parts of the present utility model, and those skilled in the art understands its structure, therefore not tired once more stating.
Referring to Fig. 1, the surface of permanent magnet machine rotor 1 is provided with the tile type magnet steel 2 of a plurality of Surface Mounts, adjacent two tile type magnet steel 2 Cheng Yiquan that is fitted to each other, and shown in the present embodiment is ends of the earth magneto, so the surface of permanent magnet machine rotor 1 is provided with 8 tile type magnet steel.
Referring to Fig. 2, Fig. 3, a lateral edges of each tile type magnet steel 2 is provided with dovetail groove 21, and symmetry place in opposite side edge is provided with the trapezoidal groove and tongue 22 that can cooperate with dovetail groove 21, and the quantity of dovetail groove 21 and trapezoidal groove and tongue 22 then can be chosen according to the actual conditions of rotor.When permanent magnet machine rotor 1 carried out the magnet steel assembling, the trapezoidal groove and tongue 22 of each tile type magnet steel 2 all inserted in the dovetail groove 21 of adjacent tiles style magnet steel 2, finished the structure that promptly forms after permanent magnet machine rotor 1 assembles as shown in Figure 1.
Trapezoidal groove and tongue 22 for the ease of tile type magnet steel 2 inserts in the dovetail groove 21 of adjacent tiles formula magnet steel, inwall 23 ecto-entads of dovetail groove 22 tilt, and the circular arc chamfering structure is all adopted at the turning 24 of tile type magnet steel 2, the turning 25 of dovetail groove 21, the turning 26 of trapezoidal groove and tongue 22 simultaneously.In the present embodiment, the teeth groove location torque of magneto has reduced about 50%, has realized reducing the purpose of motor teeth groove location torque.
More than show and described basic principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (3)
1. rotor magnetic steel has the magneto of trapezoid groove structure, described permanent magnet machine rotor surface is provided with the tile type magnet steel of a plurality of Surface Mounts, it is characterized in that: a lateral edges of described each tile type magnet steel is provided with dovetail groove, symmetry place, opposite side edge is provided with the trapezoidal groove and tongue that can cooperate with dovetail groove, and the trapezoidal groove and tongue of each tile type magnet steel all inserts in the dovetail groove of adjacent tiles style magnet steel.
2. rotor magnetic steel as claimed in claim 1 has the magneto of trapezoid groove structure, it is characterized in that: the inwall ecto-entad of described dovetail groove tilts.
3. rotor magnetic steel as claimed in claim 1 has the magneto of trapezoid groove structure, it is characterized in that: the turning of the turning of described tile type magnet steel, the turning of dovetail groove, trapezoidal groove and tongue is the circular arc chamfering structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201137241U CN201352733Y (en) | 2009-02-10 | 2009-02-10 | Permanent-magnet motor with rotor magnetic steel with dovetail groove structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201137241U CN201352733Y (en) | 2009-02-10 | 2009-02-10 | Permanent-magnet motor with rotor magnetic steel with dovetail groove structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201352733Y true CN201352733Y (en) | 2009-11-25 |
Family
ID=41376118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009201137241U Expired - Lifetime CN201352733Y (en) | 2009-02-10 | 2009-02-10 | Permanent-magnet motor with rotor magnetic steel with dovetail groove structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201352733Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868242A (en) * | 2012-10-18 | 2013-01-09 | 太仓东元微电机有限公司 | Magnetic steel structure of motor rotor |
| CN106357020A (en) * | 2016-10-28 | 2017-01-25 | 上海大学 | Motor stator for improving motor performance |
| CN106357019A (en) * | 2016-10-28 | 2017-01-25 | 上海大学 | Stator for reducing cogging torque of permanent magnet synchronous motor |
| CN112688514A (en) * | 2020-12-29 | 2021-04-20 | 福州大学 | Permanent magnet motor with permanent magnet stator and coreless axial magnetic field |
-
2009
- 2009-02-10 CN CNU2009201137241U patent/CN201352733Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868242A (en) * | 2012-10-18 | 2013-01-09 | 太仓东元微电机有限公司 | Magnetic steel structure of motor rotor |
| CN106357020A (en) * | 2016-10-28 | 2017-01-25 | 上海大学 | Motor stator for improving motor performance |
| CN106357019A (en) * | 2016-10-28 | 2017-01-25 | 上海大学 | Stator for reducing cogging torque of permanent magnet synchronous motor |
| CN112688514A (en) * | 2020-12-29 | 2021-04-20 | 福州大学 | Permanent magnet motor with permanent magnet stator and coreless axial magnetic field |
| CN112688514B (en) * | 2020-12-29 | 2022-03-11 | 福州大学 | Permanent magnet motor with permanent magnet stator and coreless axial magnetic field |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 214028 65-C, national hi tech Industrial Development Zone, Wuxi, Jiangsu, Wuxi Patentee after: Wuxi Dongjing electric micro motor Co. Ltd. Address before: 215431 Taicang City, Jiangsu province Liuhe Town, South Gate Industrial Park Patentee before: Taicang Teco Micro Motor Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20091125 |