CN112994393A - Permanent-magnet spindle motor - Google Patents
Permanent-magnet spindle motor Download PDFInfo
- Publication number
- CN112994393A CN112994393A CN201911290947.XA CN201911290947A CN112994393A CN 112994393 A CN112994393 A CN 112994393A CN 201911290947 A CN201911290947 A CN 201911290947A CN 112994393 A CN112994393 A CN 112994393A
- Authority
- CN
- China
- Prior art keywords
- rotating shaft
- magnet
- spindle motor
- magnets
- permanent magnet
- 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.)
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Classifications
-
- 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
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The invention discloses a permanent-magnet type main shaft motor, which enables a plurality of magnetic groups in a rotor to have a specific space pattern and enables magnetic flux to be concentrated so as to achieve the effect of improving the rotating speed, wherein each magnetic group is respectively provided with two first magnets, the diameters of a tubular rotating shaft of the rotor are used as mirror axes to be respectively arranged in the rotating shaft in a mirror mode, two hole-shaped magnetic barrier spaces are arranged on the rotating shaft in a penetrating mode and are respectively arranged on the positions, between the outer ring surface of the rotating shaft and the first magnets, of the rotating shaft, and the first magnets respectively extend through the two axial ends of the rotating shaft in the axial direction of the rotating shaft close to the farthest distance of the first magnets from the mirror axes.
Description
Technical Field
The present invention relates to motors, and more particularly, to a permanent magnet spindle motor.
Background
In order to obtain a good machining accuracy, a spindle (spindle) applied to a machine tool is required to have high rotational accuracy, high rotational speed, a wide operating rotational speed range, high rigidity, low temperature, and high reliability, and whether the spindle has the above characteristics is not a single factor, but a spindle motor (spindle motor) as a source of rotational power of the spindle is certainly important.
Compared with an induction motor, a permanent magnet motor has a wider rotation speed range (CPSR), better efficiency and high output torque at low rotation speed, so that a driven spindle is more suitable for a machine tool to perform high-speed and precise machining, but the torque characteristics of the motor greatly affect the rotation state of the spindle, such as the magnitude of ripple affects the machining threads of the machine tool, the magnitude of torque affects the degree of heavy cutting of the machine tool, the magnitude of rotation speed affects the machining efficiency of the machine tool, and the like, so that differences caused by differences in the output characteristics of the motor are prominent in the machine tool industry, and the rotation characteristics of the spindle are severely affected.
Disclosure of Invention
The present invention is directed to a permanent magnet spindle motor, which can increase the range of rotation speed to increase the working efficiency of a machine tool.
To achieve the above object, the present invention provides a permanent magnet spindle motor, comprising:
the stator is provided with an annular stator body part, and a plurality of stator slots are respectively arranged on the inner annular surface of the stator body part;
a rotor with a tubular shaft coaxially extending through the stator body and having an inner diameter larger than half of the outer diameter of the shaft;
the magnetic groups with the quantity smaller than the stator slots are sequentially arranged in the rotating shaft along the circumference of the rotating shaft, each magnetic group is provided with two first magnets with strip-shaped sections along the radial direction of the rotating shaft, the two first magnets are symmetrically embedded in the rotating shaft in a mirror reflection mode by taking the diameter of the rotating shaft as a mirror reflection axis, the long axis of the two first magnets and the mirror reflection axis are separated by an acute angle in the direction towards the center of the rotating shaft, and two hole-shaped magnetic barrier spaces are respectively positioned on the rotating shaft at the position between the outer annular surface of the rotating shaft and each first magnet and respectively close to the position, farthest from the mirror reflection axis, of each first magnet and extend through the two axial ends of the rotating shaft along the axial direction of the rotating shaft.
Each of the magnetic sets further includes a second magnet disposed between the first magnets.
In each magnetic group, the center of the second magnet is located on the axial direction of the mirror axis.
In each magnetic group, two sides of the second magnet are separated from the first magnets.
In each magnetic group, the length of the second magnet is smaller than that of each first magnet in the section direction along the radial direction of the rotating shaft.
In each of the magnetic groups, the first magnets are spaced apart from each other.
The rotor has the same number of containing spaces as the magnetic groups and is arranged on the rotating shaft respectively so as to contain the magnetic groups respectively.
Each accommodating space is a single through hole and is arranged on the rotating shaft in a penetrating way.
The inner diameter of the rotating shaft is 0.6 to 0.8 times of the outer diameter of the rotating shaft.
The number of the stator slots is 6 to 10 times of the number of the magnetic groups.
The invention has the beneficial effects that: the range of rotational speeds can be increased to increase the efficiency of the machine tool.
Drawings
FIG. 1 is a schematic plan view of a preferred embodiment of the present invention.
FIG. 2 is a perspective view of the magnet assembly and the rotor in accordance with a preferred embodiment of the present invention.
FIG. 3 is a partial plan view of a preferred embodiment of the present invention taken along section line 3-3 of FIG. 2.
Fig. 4A is a magnetic force diagram of a permanent magnet motor for comparison.
FIG. 4B is a magnetic force diagram of a preferred embodiment of the present invention.
Fig. 5 is a circular diagram (circle diagram) of the present invention and a comparative permanent magnet motor.
(10) A permanent magnet spindle motor (20), a stator (21), a stator body (22), a stator slot (30), a rotor (31), a rotating shaft (32), a containing space (40), a magnet group (41), a first magnet (411), a proximal end (412), a distal end (42), a second magnet (43), a magnetic barrier space (L1), a mirror axis (L2), a long axis (L3) of the first magnet, an included angle (C1) between the long axis (alpha) of the second magnet and the mirror axis, a rotating speed range (C2) of the embodiment and a rotating speed range (C2) of the embodiment are compared with the rotating speed range of the group
Detailed Description
First, referring to fig. 1 to 3, a permanent magnet spindle motor (10) according to a preferred embodiment of the present invention mainly includes a stator (20), a rotor (30) and a plurality of magnet sets (40).
The stator (20) has a ring-shaped stator body (21), and a plurality of stator slots (22) are radially recessed in the inner annular surface of the stator body (21) to serve as spaces for accommodating coil windings, wherein the coil windings are preferably distributed and wound.
The rotor (30) has a rotating shaft (31) and accommodating spaces (32) with the same number as the magnetic groups. The rotating shaft (31) is in a straight pipe shape, and the size of the inner diameter is 0.6-0.8 times of the size of the outer diameter, so that the thickness of the pipe wall is smaller than the radius of the pipe hole. The accommodating spaces (32) are respectively in a single hole shape, are sequentially arranged between two axial ends of the rotating shaft (31) in a straight line manner at equal intervals along the circumference of the rotating shaft (31), and are in a bent long strip shape in the radial direction corresponding to the rotating shaft (31).
Each magnetic group (40) is provided with two first magnets (41), a second magnet (42) and two magnetic barrier spaces (43), and each first magnet (41) and each second magnet (42) are respectively filled in the corresponding accommodating space (32) and are buried in the rotating shaft (31). Furthermore, in each magnetic group (40), the first magnets (41) are embedded in the rotating shaft (31) in a manner of being mirrored with respect to each other with the diameter of the rotating shaft (31) serving as a mirror axis (L1), and the nearest ends (411) of the first magnets (41) close to the mirror axis (L1) are spaced apart from each other; the second magnet (42) is embedded in the rotating shaft (31) between the first magnets (41), and the central position of the second magnet (42) is positioned on the mirror axis (L1); and wherein, each first magnet (41) corresponds to the long axis (L2) of the strip shape of the radial section of the rotating shaft (31), and is separated from the mirror reflection axis (L1) by an acute angle (alpha) in the direction towards the center of the rotating shaft (31), and the long axis (L3) of the strip shape of the second magnet (42) corresponding to the radial section of the rotating shaft (31) is perpendicular to the mirror reflection axis (L1), and the length of the second magnet (42) is smaller than that of each first magnet (41); the magnetic barrier spaces (43) are respectively in a hole shape, penetrate between two axial ends of the rotating shaft (31) along the axial direction of the rotating shaft (31), are close to the farthest distance (412) of each first magnet (41) far away from the mirror axis (L1) in the long axis direction, and are positioned between the adjacent first magnets (41) and the peripheral ring surface of the rotating shaft (31).
In the above-mentioned components, the rotor (30) penetrates the stator (20), and the outer diameter of the rotating shaft (31) is smaller than the inner diameter of the stator body (21), and an annular air gap space is formed between the outer annular surface of the rotating shaft (31) and the inner annular surface of the stator body (21), meanwhile, in the illustrated embodiment, the number of the corresponding stator slots in the angular range of each magnetic set (40) is further made to be 6, and even if the number of the stator slots (22) is 6 times of the number of the magnetic sets (40), the disclosure of the value is only for illustrative purposes and is not a limitation of the present invention, for example, the d6 time is changed to 6 times to 10 times, and the like, which is only a simple change to the present invention.
From the aspect of efficiency, one of the main technical features of the permanent magnet spindle motor (10) is the effect provided by the magnetic barrier spaces (43) on concentrating the magnetic flux, and referring to the magnetic force diagram of the permanent magnet spindle motor (10) shown in fig. 4A and the magnetic force diagram of the spindle motor for comparison without magnetic barrier spaces shown in fig. 4B, it can be seen from the difference of the magnetic force lines that the permanent magnet spindle motor (10) has the effect of concentrating the magnetic flux and can provide higher torque and higher rotation speed to meet the requirement of spindle use, and the circle diagram (circle diagram) shown in fig. 5 also shows the rotation speed range (C1) in which the permanent magnet spindle motor (10) can work, and is also larger than the rotation speed range (C2) of the spindle motor for comparison shown in fig. 4B, it is apparent that the disclosed permanent magnet spindle motor has the specific effects of torque enhancement and high rotation speed application, the requirements of the spindle of the machine tool are met, so that the technology provided by the invention is particularly suitable for being used as a spindle motor.
In addition, it should be noted that although the magnetic assembly of the foregoing embodiments includes the second magnet in addition to the first magnet, the second magnet may be omitted in industrial implementation, and the effect achieved by the magnetic assembly without the second magnet is not significantly different from that achieved by the prior art, but when the magnetic assembly without the second magnet, the distance between the nearest ends of the two first magnets, which are mirrored with each other, may be shortened in order to effectively utilize the limited volume of the rotating shaft.
Claims (10)
1. A permanent magnet type spindle motor, comprising:
the stator is provided with an annular stator body part, and a plurality of stator slots are respectively arranged on the inner annular surface of the stator body part;
a rotor with a tubular shaft coaxially extending through the stator body and having an inner diameter larger than half of the outer diameter of the shaft;
the magnetic groups with the quantity smaller than the stator slots are sequentially arranged in the rotating shaft along the circumference of the rotating shaft, each magnetic group is provided with two first magnets with strip-shaped sections along the radial direction of the rotating shaft, the two first magnets are symmetrically embedded in the rotating shaft in a mirror reflection mode by taking the diameter of the rotating shaft as a mirror reflection axis, the long axis of the two first magnets and the mirror reflection axis are separated by an acute angle in the direction towards the center of the rotating shaft, and two hole-shaped magnetic barrier spaces are respectively positioned on the rotating shaft at the position between the outer annular surface of the rotating shaft and each first magnet and respectively close to the position, farthest from the mirror reflection axis, of each first magnet and extend through the two axial ends of the rotating shaft along the axial direction of the rotating shaft.
2. The permanent magnet spindle motor according to claim 1, wherein each of the magnet sets further comprises a second magnet interposed between the first magnets.
3. The permanent magnet spindle motor according to claim 2, wherein in each of the magnet groups, the second magnet is centered on the mirror axis in the axial direction.
4. A permanent magnet spindle motor according to claim 2 or 3, wherein in each of the magnet groups, the second magnet is spaced apart from each of the first magnets on both sides thereof.
5. A permanent magnet spindle motor according to claim 2 or 3, wherein the length of the second magnet is smaller than the length of each of the first magnets in each of the magnet groups in a sectional direction along a radial direction of the rotation shaft.
6. The permanent magnet spindle motor according to claim 1, wherein each of the first magnets in each of the magnet groups is spaced apart from each other.
7. A permanent magnet spindle motor according to claim 1, 2 or 3, wherein the rotor has the same number of receiving spaces as the number of the magnet groups, respectively, provided on the rotating shaft to receive the magnet groups, respectively.
8. The permanent magnet spindle motor according to claim 7, wherein each of the receiving spaces is a single through hole formed through the rotation shaft.
9. The permanent magnet spindle motor according to claim 1, wherein the inner diameter of the rotating shaft is 0.6 to 0.8 times the outer diameter of the rotating shaft.
10. The permanent magnet spindle motor according to claim 1, wherein the number of the stator slots is 6 to 10 times the number of the magnet groups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911290947.XA CN112994393A (en) | 2019-12-16 | 2019-12-16 | Permanent-magnet spindle motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911290947.XA CN112994393A (en) | 2019-12-16 | 2019-12-16 | Permanent-magnet spindle motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112994393A true CN112994393A (en) | 2021-06-18 |
Family
ID=76343032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911290947.XA Withdrawn CN112994393A (en) | 2019-12-16 | 2019-12-16 | Permanent-magnet spindle motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112994393A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006280195A (en) * | 2005-03-01 | 2006-10-12 | Toshiba Corp | Permanent magnet type rotary electric machine |
| JP2006311772A (en) * | 2005-05-02 | 2006-11-09 | Nissan Motor Co Ltd | Dynamo-electric motor |
| CN201846151U (en) * | 2010-03-22 | 2011-05-25 | 株洲南车时代电气股份有限公司 | Rotor device of permanent magnet motor |
| TW201325031A (en) * | 2011-12-01 | 2013-06-16 | Adlee Powertronic Co Ltd | Built-in permanent magnet motor |
| CN107017750A (en) * | 2017-05-08 | 2017-08-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor |
| CN109510344A (en) * | 2018-12-28 | 2019-03-22 | 哈尔滨工业大学 | The adjustable flux electric machine of magnetic circuit partition type V-type parallel combination magnetic pole with double-layer magnetic barrier |
| CN110022016A (en) * | 2019-04-24 | 2019-07-16 | 广东金霸智能科技股份有限公司 | A kind of rotor chip and its rotor and motor |
| US20190222076A1 (en) * | 2018-01-15 | 2019-07-18 | Otis Elevator Company | Electric machine including magnets having different magnetic characteristics |
-
2019
- 2019-12-16 CN CN201911290947.XA patent/CN112994393A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006280195A (en) * | 2005-03-01 | 2006-10-12 | Toshiba Corp | Permanent magnet type rotary electric machine |
| JP2006311772A (en) * | 2005-05-02 | 2006-11-09 | Nissan Motor Co Ltd | Dynamo-electric motor |
| CN201846151U (en) * | 2010-03-22 | 2011-05-25 | 株洲南车时代电气股份有限公司 | Rotor device of permanent magnet motor |
| TW201325031A (en) * | 2011-12-01 | 2013-06-16 | Adlee Powertronic Co Ltd | Built-in permanent magnet motor |
| CN107017750A (en) * | 2017-05-08 | 2017-08-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor |
| US20190222076A1 (en) * | 2018-01-15 | 2019-07-18 | Otis Elevator Company | Electric machine including magnets having different magnetic characteristics |
| CN109510344A (en) * | 2018-12-28 | 2019-03-22 | 哈尔滨工业大学 | The adjustable flux electric machine of magnetic circuit partition type V-type parallel combination magnetic pole with double-layer magnetic barrier |
| CN110022016A (en) * | 2019-04-24 | 2019-07-16 | 广东金霸智能科技股份有限公司 | A kind of rotor chip and its rotor and motor |
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| 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 | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210618 |