CN201629647U - Permanent magnet for permanent magnet direct current (DC) brushless motor - Google Patents
Permanent magnet for permanent magnet direct current (DC) brushless motor Download PDFInfo
- Publication number
- CN201629647U CN201629647U CN2010201000222U CN201020100022U CN201629647U CN 201629647 U CN201629647 U CN 201629647U CN 2010201000222 U CN2010201000222 U CN 2010201000222U CN 201020100022 U CN201020100022 U CN 201020100022U CN 201629647 U CN201629647 U CN 201629647U
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- Prior art keywords
- permanent magnet
- permanent
- magnet
- circular arc
- permanent magnets
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Abstract
The utility model discloses a permanent magnet body for a permanent magnet direct current (DC) brushless motor. The permanent magnet body is in a ring shape formed by a plurality of permanent magnets (1), the shape of each permanent magnet (1) is approximately in a fan shape, and each permanent magnet (1) is formed by two sections of arcs and two straight lines (1.3) which are respectively connected with the two ends of the two sections of arcs; the two sections of arcs are respectively a first arc (1.1) and a second arc (1.2), the first arc (1.1) is positioned on the outer side of the second arc (1.2), and the radius of the first arc (1.1) is less than the radius of the second arc (1.2). When being used for the permanent magnet direct current (DC) brushless motor, the permanent magnet body has the characteristics of little magnetic leakage, small noise, high torque produced and high efficiency.
Description
Technical field
The utility model relates to industrial circle non-brush permanent-magnet DC motor commonly used, specifically is a kind of permanent magnet that is used for non-brush permanent-magnet DC motor.
Background technology
The existing permanent magnet that is used for non-brush permanent-magnet DC motor as shown in Figure 2, generally surround the annular of a closure by a plurality of permanent magnets, it is fan-shaped that the profile of described each permanent magnets roughly is, and described fan-shaped permanent magnets is surrounded by circular arc and two straight lines that connect the two ends of described two sections circular arcs respectively of two sections concentrics and different radii.Adopt the non-brush permanent-magnet DC motor of said structure permanent magnet in the use of reality, to have following defective:
1, (wherein B is a magnetic flux density according to Φ=BS formula, S is an area, Φ is a leakage field magnetic flux) can draw, in existing magnet structure, the magnetic flux density of each permanent magnets all is the same, and the magnetic pole of adjacent two permanent magnets is different, but because the contact area of adjacent two permanent magnets is bigger, therefore the leakage field magnetic flux of adjacent two permanent magnets is very big, just the leakage field of existing permanent magnet is a lot, and leakage field is very big for the safe operation and the life-span threat of non-brush permanent-magnet DC motor.
2, because the leakage field of existing permanent magnet is a lot, therefore be subjected to the leakage field influence, the vibration of a plurality of permanent magnets is quite strong, thus the noise that causes existing non-brush permanent-magnet DC motor to move is very big.
3, because each permanent magnets fan-shaped all is circular arc and two straight lines that connect the two ends of described two sections circular arcs respectively by two sections concentrics and different radii surrounds, distance between two sections circular arcs of each permanent magnets equates, therefore adjacent two the formed magnetic field of permanent magnets areas are smaller, according to Φ=BS formula, magnetic flux density is constant, and the magnetic field area is less, can draw: the magnetic flux of existing permanent magnet is less, therefore cause the moment of non-brush permanent-magnet DC motor little, efficient is low.
The utility model content
The technical problems to be solved in the utility model is, overcomes the defective of above prior art, provides that a kind of leakage field is few, noise is little and produce the permanent magnet that is used for non-brush permanent-magnet DC motor that moment is big, efficient is high.
The technical solution of the utility model is, a kind of permanent magnet that is used for non-brush permanent-magnet DC motor is provided, the annular that described permanent magnet is surrounded by a plurality of permanent magnets, it is fan-shaped that the profile of each permanent magnets roughly is, and each permanent magnets is surrounded by two sections circular arcs and two straight lines that connect described two sections circular arc two ends respectively; Described two sections circular arcs are respectively first circular arc and second circular arc, and described first circular arc is positioned at the radius of the radius of the outside of second circular arc and described first circular arc less than second circular arc.
After adopting above structure, the utility model compared with prior art has the following advantages:
1, because first circular arc of each permanent magnets is positioned at the radius of the radius of the outside of second circular arc and described first circular arc less than second circular arc, form a thick middle, the thin permanent magnets in both sides, this diminishes with regard to the contact area that makes adjacent two permanent magnets, according to Φ=BS formula, magnetic flux density is constant, the magnetic field area is less, therefore the leakage field magnetic flux of adjacent two permanent magnets reduces, just the leakage field of permanent magnet seldom, thereby reduced leakage field for the safe operation of non-brush permanent-magnet DC motor and the threat in life-span.
2, since the leakage field of the utility model permanent magnet seldom, the influence that therefore is subjected to leakage field is limited, the vibration of a plurality of permanent magnets is quite faint, thereby the noise that makes existing non-brush permanent-magnet DC motor move is very little.
3, because first circular arc of each permanent magnets is positioned at the radius of the radius of the outside of second circular arc and described first circular arc less than second circular arc, form the permanent magnets of the thin magnetism-collected structure of a thick middle, both sides, this has not only reduced the volume of permanent magnets, and adjacent two the formed magnetic field of permanent magnets areas have been increased, according to Φ=BS formula, magnetic flux density is constant, it is big that the magnetic field area becomes, can draw: the magnetic flux of existing permanent magnet is bigger, therefore make the moment of non-brush permanent-magnet DC motor increase, efficient improves.
As improvement, gapped between described two adjacent permanent magnets 1, so just reduced magnetic flux density, can get according to Φ=BS formula, magnetic flux density diminishes, and the magnetic field area is constant, and the leakage field magnetic flux of adjacent two permanent magnets reduces, this just makes the leakage field of permanent magnet further reduce, thereby has further reduced leakage field for the safe operation of non-brush permanent-magnet DC motor and the threat in life-span.
Description of drawings
Fig. 1 is the plan structure schematic diagram of the utility model permanent magnet of being used for non-brush permanent-magnet DC motor.
Fig. 2 is the plan structure schematic diagram of the prior art permanent magnet that is used for non-brush permanent-magnet DC motor.
Shown in the figure 1, permanent magnets, 1.1, first circular arc, 1.2, second circular arc, 1.3, straight line.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, a kind of permanent magnet that is used for non-brush permanent-magnet DC motor of the utility model, the annular that described permanent magnet is surrounded by a plurality of permanent magnets 1, it is fan-shaped that the profile of each permanent magnets 1 roughly is, each permanent magnets 1 is surrounded by two sections circular arcs and two straight lines 1.3 that connect described two sections circular arc two ends respectively, described two sections circular arcs are respectively first circular arc 1.1 and second circular arc 1.2, and described first circular arc 1.1 is positioned at the radius of the radius of the outside of second circular arc 1.2 and described first circular arc 1.1 less than second circular arc 1.2.Formed just that a both sides are thin, the permanent magnets of thick middle.
Gapped between described two adjacent permanent magnets 1, so just reduced magnetic flux density, can get according to Φ=BS formula, magnetic flux density diminishes, the magnetic field area is constant, the leakage field magnetic flux of adjacent two permanent magnets reduces, and this just makes the leakage field of permanent magnet further reduce, thereby has further reduced leakage field for the safe operation of non-brush permanent-magnet DC motor and the threat in life-span.
Connection between a plurality of permanent magnets of the utility model waits the identical of other structure and prior art, therefore just no longer launches in the present embodiment to have described.
Claims (2)
1. permanent magnet that is used for non-brush permanent-magnet DC motor, the annular that described permanent magnet is surrounded by a plurality of permanent magnets (1), the profile of each permanent magnets (1) roughly is fan-shaped, each permanent magnets (1) is surrounded by two sections circular arcs and two straight lines (1.3) that connect described two sections circular arc two ends respectively, it is characterized in that: described two sections circular arcs are respectively first circular arc (1.1) and second circular arc (1.2), and described first circular arc (1.1) is positioned at the radius of the radius of the outside of second circular arc (1.2) and described first circular arc (1.1) less than second circular arc (1.2).
2. the permanent magnet that is used for non-brush permanent-magnet DC motor according to claim 1 is characterized in that: gapped between described adjacent two permanent magnets (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201000222U CN201629647U (en) | 2010-01-18 | 2010-01-18 | Permanent magnet for permanent magnet direct current (DC) brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201000222U CN201629647U (en) | 2010-01-18 | 2010-01-18 | Permanent magnet for permanent magnet direct current (DC) brushless motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201629647U true CN201629647U (en) | 2010-11-10 |
Family
ID=43061046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201000222U Expired - Lifetime CN201629647U (en) | 2010-01-18 | 2010-01-18 | Permanent magnet for permanent magnet direct current (DC) brushless motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201629647U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921525A (en) * | 2019-03-19 | 2019-06-21 | 甘长泉 | A kind of motor magnet ring and magnet reducing eddy current effect |
-
2010
- 2010-01-18 CN CN2010201000222U patent/CN201629647U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921525A (en) * | 2019-03-19 | 2019-06-21 | 甘长泉 | A kind of motor magnet ring and magnet reducing eddy current effect |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180211 Address after: 315191 Yinzhou District Province, Ningbo City, Jiang Shan town on the village of summer ho Patentee after: AUX air conditioning Limited by Share Ltd Address before: 315191, AUX Industrial Park, Mingguang North Road, Jiangshan Town, Ningbo, Yinzhou District, Zhejiang 1166, China Patentee before: Ningbo Haicheng Electric al Appliances Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101110 |