CN203674831U - Permanent-magnet DC brushless motor - Google Patents
Permanent-magnet DC brushless motor Download PDFInfo
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- CN203674831U CN203674831U CN201320870395.1U CN201320870395U CN203674831U CN 203674831 U CN203674831 U CN 203674831U CN 201320870395 U CN201320870395 U CN 201320870395U CN 203674831 U CN203674831 U CN 203674831U
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 115
- 239000010959 steel Substances 0.000 claims abstract description 115
- 238000005452 bending Methods 0.000 claims description 7
- 230000004907 flux Effects 0.000 abstract description 11
- 230000010349 pulsation Effects 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000013459 approach Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000007767 bonding agent Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000009510 drug design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Abstract
The utility model provides a permanent-magnet DC brushless motor which comprises a stator and a rotor. A radial air gap exists between the stator and the rotor. The rotor comprises a rotor core and magnetic steel which is sleeved on the rotor core. The magnetic poles of the magnetic pole are alternately arranged on outer circumference of the stator core in the circumferential direction according to an N-S alternative arrangement. The thickness of each magnetic pole of the magnetic steel is maximal at the center of the magnetic pole in the radial direction of the magnetic steel, and furthermore gradually reduces from the center of the magnetic pole to two sides of the magnetic pole. According to the permanent-magnet DC brushless motor provided by the utility model, through manufacturing the magnetic pole of the magnetic steel to a structure which is thick at the central part and is thin at two sides, nearly sinusoidal distribution of a main pole magnetic field in the radial air gap is realized. Magnetic flux density harmonic of the air gap and torque pulsation of a tooth groove are reduced, thereby improving efficiency of the permanent-magnet DC brushless motor. Simultaneously the polygonal rotor core prevents circumferential sliding of the magnetic steel and the rotor core. Furthermore the permanent-magnet DC brushless motor has advantages of simple structure and cost reduction.
Description
Technical field
The utility model relates to permanent magnet DC motor technical field, particularly relates to a kind of non-brush permanent-magnet DC motor.
Background technology
As shown in Figure 1, non-brush permanent-magnet DC motor of the prior art, the rotor of motor is made up of thickness circular ring type magnet steel and rotor core conventionally, and annular magnetic steel bushing is located at the surface of rotor core, then uses binding agent that rotor core and magnet steel are fixed.Like this, tend to cause air gap flux density harmonic content large, the large and electric efficiency problem on the low side of noise of motor.
Utility model content
In view of the present situation of prior art, the purpose of this utility model is to provide a kind of non-brush permanent-magnet DC motor, and this non-brush permanent-magnet DC motor has reduced air gap flux density harmonic wave, has reduced cogging torque pulsation, thereby has improved the efficiency of motor.
For achieving the above object, the utility model adopts following technical scheme:
A kind of non-brush permanent-magnet DC motor, comprise stator and rotor, between described stator and described rotor, be provided with radial air gap, described rotor comprises rotor core and be set in the magnet steel on described rotor core, and the magnetic pole of described magnet steel is alternately distributed the periphery at described rotor core at circumferencial direction by N-S;
Each magnetic pole of described magnet steel at the thickness in the radial direction of described magnet steel take pole center as maximum, and with the Central Symmetry of magnetic pole reduce gradually to the both sides of magnetic pole.
In an embodiment, the lateral surface of each magnetic pole of described magnet steel is arc surface therein, and the medial surface of described magnet steel is also arc surface, and the medial surface of described magnet steel is concentric with described rotor core.
In an embodiment, the lateral surface of each magnetic pole of described magnet steel is the arcwall face of radius R 1 therein, and the medial surface of each magnetic pole of described magnet steel is the arcwall face of radius R 2, R1 < R2; The bending direction of described lateral surface and described medial surface is identical.
In an embodiment, the lateral surface of each magnetic pole of described magnet steel is arc surface therein, and the medial surface of each magnetic pole of described magnet steel is plane.
In an embodiment, the lateral surface of each magnetic pole of described magnet steel is that radius is the arcwall face of R3 therein, and the medial surface of each magnetic pole of described magnet steel is the arcwall face of radius R 4;
The bending direction of described lateral surface and described medial surface is contrary.
In an embodiment, the lateral surface of described rotor core is identical with the shape of the medial surface of described magnet steel therein, and the lateral surface of described rotor core and the medial surface of described magnet steel are in contact with one another.
In an embodiment, between the adjacent pole of described magnet steel, be provided with fixed mount therein;
The lateral surface of described fixed mount is arc surface, and the lateral surface of described fixed mount is concentric with described rotor core;
The medial surface of described fixed mount is identical with the shape of the lateral surface of each magnetic pole of described magnet steel, and the lateral surface of the medial surface of described fixed mount and each magnetic pole of described magnet steel is in contact with one another.
In an embodiment, described fixed mount also comprises abutting stem therein, and described abutting stem is arranged on the two ends of described fixed mount;
Described rotor also comprises rotor endcap, and described rotor endcap is arranged on the two ends of described rotor;
In described rotor endcap, be provided with bracket holes, described abutting stem embeds in described bracket holes.
In an embodiment, in described rotor endcap, be also provided with the first screw hole therein, on described rotor core, be provided with the second screw hole;
Described the first screw hole matches by screw with described the second screw hole.
The beneficial effects of the utility model are:
Non-brush permanent-magnet DC motor of the present utility model, forms thick middle by the magnetic pole that makes magnet steel, and the structure that both sides are thin, makes main pole magnetic field in radial air gap, approach Sine distribution.Reduce like this air gap flux density harmonic wave, reduced cogging torque pulsation, thereby improved the efficiency of non-brush permanent-magnet DC motor.Meanwhile, polygonal rotor core has prevented the circumferential slip of magnet steel and rotor core, simple in structure, saves cost.Between the adjacent pole of magnet steel, be provided with fixed mount, can improve the reliability of high speed operation of motor and reduce wind moussing loss.
Accompanying drawing explanation
Fig. 1 is the structural representation of non-brush permanent-magnet DC motor in prior art;
Fig. 2 is the overall structure schematic diagram of non-brush permanent-magnet DC motor one embodiment of the present utility model;
Fig. 3 is the structural representation of the rotor of the embodiment mono-of non-brush permanent-magnet DC motor of the present utility model;
Fig. 4 is the structural representation of the rotor of the embodiment bis-of non-brush permanent-magnet DC motor of the present utility model;
Fig. 5 is the structural representation of the rotor of the embodiment tri-of non-brush permanent-magnet DC motor of the present utility model;
Fig. 6 is the structural representation of the rotor of the embodiment tetra-of non-brush permanent-magnet DC motor of the present utility model;
Fig. 7 is the structural representation of the rotor of the embodiment five of non-brush permanent-magnet DC motor of the present utility model;
Fig. 8 is the structural representation of the rotor of the embodiment six of non-brush permanent-magnet DC motor of the present utility model;
Fig. 9 is the schematic diagram of fixed mount one embodiment of non-brush permanent-magnet DC motor of the present utility model;
Figure 10 is the schematic diagram of rotor endcap one embodiment of non-brush permanent-magnet DC motor of the present utility model;
Figure 11 is the fixed mount of non-brush permanent-magnet DC motor of the present utility model and the schematic diagram that coordinates of rotor endcap;
Figure 12 is the effect of optimization figure of non-brush permanent-magnet DC motor of the present utility model to the pulsation of motor cogging torque;
Figure 13 is the effect of optimization figure of non-brush permanent-magnet DC motor of the present utility model to the close harmonic wave of motor gas-gap magnetic.
Embodiment
In order to make the technical solution of the utility model clearer, below in conjunction with accompanying drawing, non-brush permanent-magnet DC motor of the present utility model is described in further detail.Should be appreciated that specific embodiment described herein is only in order to explain the utility model and to be not used in restriction the utility model.
Referring to Fig. 2 to Figure 13, as Fig. 2 with Figure 11 shows that the overall structure schematic diagram of an embodiment of non-brush permanent-magnet DC motor of the present utility model, comprise stator 1, rotor 2, fixed mount 6 and rotor endcap 7.Wherein, between stator 1 and rotor 2, be provided with radial air gap 3.Rotor 2 comprises rotor core 4 and magnet steel 5, and ringwise, magnet steel 5 is set on rotor core 4 magnet steel 5.And magnet steel 5 comprises multiple magnetic poles, the number of magnetic poles of magnet steel 5 is generally even number, and multiple magnetic pole is alternately distributed the periphery at rotor core 4 at circumferencial direction according to N-S.Rotor endcap 7 is arranged on the two ends of rotor 2, and fixed mount 6 cooperatively interacts with rotor endcap 7, fixed mount 6 is installed fixing.
As a kind of embodiment, each magnetic pole of magnet steel 5 is the center maximum with magnetic pole at the thickness in the radial direction of magnet steel 5, and reduce gradually with the centrosymmetric both sides to magnetic pole of this magnetic pole, the center of the adjacent pole of magnet steel is in the thickness minimum in the radial direction of magnet steel.Like this, due to magnetic pole thick middle, the structure that both sides are thin, makes main pole magnetic field approach Sine distribution in radial air gap 3, has improved magnetomotive distribution, has reduced air gap flux density harmonic wave, has reduced cogging torque pulsation.Thereby improve noise and the vibration of motor, improved the efficiency of motor.
Preferably, the lateral surface of rotor core is identical with the shape of the medial surface of magnet steel, and the lateral surface of rotor core and the medial surface of magnet steel are in contact with one another.Centrifugal vibration can reduce motor rotation like this time, is not using under the condition of bonding agent, makes magnet steel circumferentially fixing, prevents circumferential slip.
Embodiment mono-
Be illustrated in figure 3 the structural representation of the rotor of the embodiment mono-of non-brush permanent-magnet DC motor of the present utility model.Wherein, magnet steel 5 comprises three pairs of magnetic poles, and three pairs of magnetic poles are alternately distributed the periphery at rotor core 4 according to N-S.In the present embodiment, the lateral surface of each magnetic pole of magnet steel 5 is arc surface, the shape of the lateral surface of the medial surface of magnet steel 5 and rotor core 4 is arc surface, make so each magnetic pole at the thickness in the radial direction of magnet steel the center maximum with magnetic pole, and with the Central Symmetry of magnetic pole reduce gradually to the both sides of magnetic pole.Thickness minimum between two adjacent magnetic pole N-S, the position being connected at two circular arcs, magnet steel is in the thickness minimum of radial direction.
Make like this radial air gap between stator and rotor unequal, thereby make main pole magnetic field in radial air gap, approach Sine distribution, reduce air gap flux density harmonic wave (as shown in figure 13), reduce cogging torque pulsation (as shown in figure 12), improve noise and the vibration of motor, improved the efficiency of motor.It should be understood that curve 1 in Figure 12 and Figure 13 represents the effect of motor in prior art, curve 2 represents the effect of non-brush permanent-magnet DC motor of the present utility model.
In the present embodiment, the medial surface of magnet steel is concentric with rotor core 4, the Centrifugal vibration while so just having reduced motor operation.Magnet steel 5 is in contact with one another with rotor core 4, makes magnet steel 5 circumferentially fixing, prevents the circumferential slip of magnet steel 5, has guaranteed the operating reliability of motor.
Between adjacent pole, be provided with fixed mount 6, preferably, the material of this fixed mount 6 is insulating material, as plastics, pottery etc.The lateral surface of fixed mount 6 is arc surface, and the lateral surface of fixed mount 6 is concentric with rotor core 4, can reduce like this wind moussing loss (wind moussing loss refers to the wind-force frictional dissipation that motor produces because of ventilation).The medial surface of fixed mount 6 is identical with the shape of the lateral surface of magnet steel 5, and is in contact with one another with the lateral surface of magnet steel 5, can improve like this reliability of high speed operation of motor.
As shown in Figure 9 and Figure 10, be provided with abutting stem 61 at the two ends of fixed mount 6, be provided with bracket holes 72 in rotor endcap 7, abutting stem 61 embeds bracket holes 72, and fixed mount 6 is fixed in rotor endcap 7, increases the reliability of motor rotation.In rotor endcap 7, being also provided with the first screw hole 71, the first screw holes 71 matches with the second screw hole 21 being arranged on rotor core 4.Screw is fixed on rotor endcap 7 on rotor core 4 through the first screw hole 71 and the second screw hole 21, prevents the axially displaced of magnet steel.
Embodiment bis-
Be illustrated in figure 4 the structural representation of the rotor of the embodiment bis-of non-brush permanent-magnet DC motor of the present utility model.The difference of embodiment bis-and embodiment mono-is the structure of magnet steel 5 and rotor core 4.Only its difference is made to detailed description below.
The lateral surface of each magnetic pole of magnet steel 5 is the arcwall face of radius R 1, and the medial surface of each magnetic pole of magnet steel 5 is the arcwall face of radius R 2, R1 < R2.And the bending direction of lateral surface and medial surface is identical, the medial surface of each magnetic pole and lateral surface form watt shape structure.Make like this radial air gap between stator and rotor unequal, main pole magnetic field approaches Sine distribution in radial air gap, thereby has reduced air gap flux density harmonic wave, has reduced cogging torque pulsation, has improved the efficiency of motor.
The shape of the lateral surface of rotor core 4 is identical with the shape of the medial surface of magnet steel 5, and the lateral surface of rotor core and the medial surface of magnet steel are in contact with one another.So just can not use under the condition of bonding agent, make annular magnetic steel circumferentially fixing.Also can improve the power output of motor by watt shape structure of rational design magnetic pole, also save the consumption of magnet steel.
Identical with embodiment mono-, between the adjacent pole of magnet steel, be also provided with fixed mount 6, fixed mount 6 matches with rotor endcap 7, repeats no more herein.
Embodiment tri-
Be illustrated in figure 5 the structural representation of the rotor of the embodiment tri-of non-brush permanent-magnet DC motor of the present utility model.In the present embodiment, the lateral surface of each magnetic pole of magnet steel is given as arc surface, the medial surface plane of each magnetic pole of magnet steel.Can carry out by the consumption of magnet steel like this specific magnetic loading of lifting motor, increase the power output of motor.The lateral surface of rotor core 4 is identical with the shape of the medial surface of magnet steel 5, and the lateral surface of rotor core 4 and the medial surface of magnet steel be in contact with one another, and prevents the circumferential slip of magnet steel.
Identical with embodiment mono-, between the adjacent pole of magnet steel 5, be provided with fixed mount 6, fixed mount 6 matches with rotor endcap 7, the reliability while having increased motor operation.
Embodiment tetra-
Be illustrated in figure 6 the structural representation of the rotor of the embodiment tetra-of permanent magnet DC motor of the present utility model.In the present embodiment, the lateral surface of each magnetic pole of magnet steel 5 is that radius is the arcwall face of R3, and the medial surface of each magnetic pole of magnet steel is the arcwall face of radius R 4.Different from embodiment bis-, in the present embodiment, the lateral surface of magnet steel is contrary with the bending direction of medial surface, and the bending direction of arc is contrary.Can carry out by increasing the consumption of magnet steel like this specific magnetic loading of lifting motor, increase the power output of motor.In the time obtaining with the fan-out capability of embodiment bis-, can adopt the magnetic steel material of the low trade mark, reduce costs.The lateral surface of rotor core 4 and the medial surface of magnet steel are in contact with one another.
Identical with embodiment mono-, between the magnetic pole of magnet steel 5, the lateral surface at center is provided with fixed mount 6, and fixed mount 6 matches with rotor endcap 7, the reliability while having increased motor operation.
Embodiment five
As the structural representation of the rotor of Fig. 7 embodiment five that is non-brush permanent-magnet DC motor of the present utility model.The lateral surface of magnet steel 5 is circular face, has reduced like this wind moussing loss.And the lateral surface of magnet steel 5 is concentric with rotor core 4, make rotor 2 and stator 1 form the radial air gap 3 equating.The medial surface of the magnetic pole of magnet steel 5 can be arcwall face in embodiment bis-or arbitrary polygonized structure of embodiment tri-or embodiment tetra-.Like this due to the thin structure in thick middle, the both sides of magnetic pole, make the waveform of main pole magnetic field in radial air gap 3 be middle high, the sinusoidal trend that both sides are low, has reduced air gap flux density harmonic wave and cogging torque pulsation, increase specific magnetic loading, improved motor power output.The lateral surface of rotor core 4 is identical with the shape of the medial surface of magnet steel, and the lateral surface of rotor core and the medial surface of magnet steel be in contact with one another, and can prevent so the circumferential slip of magnet steel.
In the present embodiment, because the lateral surface of magnet steel 5 is circular face, therefore, between the lateral surface of each magnetic pole of magnet steel 5, fixed mount 6 can be set.In the time of assembling motor, only need, with screw successively through the first screw hole 71 and the second screw hole 21, rotor endcap and rotor core be fixed together.
Embodiment six
As the structural representation of the rotor of Fig. 8 embodiment six that is non-brush permanent-magnet DC motor of the present utility model.The lateral surface of each magnetic pole of magnet steel 5 is arcwall face, makes to form between rotor 2 and stator 1 unequal radial air gap 3.Make like this main pole magnetic field approach Sine distribution in radial air gap 3, reduced air gap flux density harmonic wave, reduced cogging torque pulsation, improved noise and the vibration of motor.The medial surface of each magnetic pole of magnet steel 5 is also arcwall face, and each magnetic pole of magnet steel 5 equates at the thickness of magnet steel radial direction.Although increased like this consumption of some magnet steel, can increase the mean value of air gap flux density, improve the fan-out capability of motor.
And each magnetic pole equates at the thickness of the radial direction of magnet steel, has increased the structural strength of magnet steel, has improved motor reliability of operation.Being in contact with one another of the shape of the lateral surface of rotor core 4 and the medial surface of magnet steel identical and the lateral surface of rotor core and the medial surface of magnet steel, prevents the circumferential slip of magnet steel.
Identical with embodiment mono-, between the adjacent pole of magnet steel 5, be provided with fixed mount 6, fixed mount 6 matches with rotor endcap 7, the reliability while having increased motor operation.
Non-brush permanent-magnet DC motor of the present utility model, forms thick middle by the magnetic pole that makes magnet steel, and the structure that both sides are thin, makes main pole magnetic field in radial air gap, approach Sine distribution.Reduce like this air gap flux density harmonic wave, reduced cogging torque pulsation, thereby improved the efficiency of non-brush permanent-magnet DC motor.Meanwhile, polygonal rotor core has prevented the circumferential slip of magnet steel and rotor core, simple in structure, saves cost.Between the adjacent pole of magnet steel, be provided with fixed mount, can improve the reliability of high speed operation of motor and reduce wind moussing loss.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (9)
1. a non-brush permanent-magnet DC motor, comprise stator and rotor, between described stator and described rotor, be provided with radial air gap, described rotor comprises rotor core and is set in the magnet steel on described rotor core, the magnetic pole of described magnet steel is alternately distributed the periphery at described rotor core at circumferencial direction by N-S, it is characterized in that:
Each magnetic pole of described magnet steel at the thickness in the radial direction of described magnet steel take pole center as maximum, and with the Central Symmetry of magnetic pole reduce gradually to the both sides of magnetic pole.
2. non-brush permanent-magnet DC motor according to claim 1, is characterized in that:
The lateral surface of each magnetic pole of described magnet steel is arc surface, and the medial surface of described magnet steel is also arc surface, and the medial surface of described magnet steel is concentric with described rotor core.
3. non-brush permanent-magnet DC motor according to claim 1, is characterized in that:
The lateral surface of each magnetic pole of described magnet steel is the arcwall face of radius R 1, and the medial surface of each magnetic pole of described magnet steel is the arcwall face of radius R 2, R1 < R2;
The bending direction of described lateral surface and described medial surface is identical.
4. non-brush permanent-magnet DC motor according to claim 1, is characterized in that:
The lateral surface of each magnetic pole of described magnet steel is arc surface, and the medial surface of each magnetic pole of described magnet steel is plane.
5. non-brush permanent-magnet DC motor according to claim 1, is characterized in that:
The lateral surface of each magnetic pole of described magnet steel is that radius is the arcwall face of R3, and the medial surface of each magnetic pole of described magnet steel is the arcwall face of radius R 4;
The bending direction of described lateral surface and described medial surface is contrary.
6. according to the non-brush permanent-magnet DC motor described in claim 1-5 any one, it is characterized in that:
The lateral surface of described rotor core is identical with the shape of the medial surface of described magnet steel, and the lateral surface of described rotor core and the medial surface of described magnet steel are in contact with one another.
7. non-brush permanent-magnet DC motor according to claim 6, is characterized in that:
Between the adjacent pole of described magnet steel, be provided with fixed mount;
The lateral surface of described fixed mount is arc surface, and the lateral surface of described fixed mount is concentric with described rotor core;
The medial surface of described fixed mount is identical with the shape of the lateral surface of each magnetic pole of described magnet steel, and the lateral surface of the medial surface of described fixed mount and each magnetic pole of described magnet steel is in contact with one another.
8. non-brush permanent-magnet DC motor according to claim 7, is characterized in that:
Described fixed mount also comprises abutting stem, and described abutting stem is arranged on the two ends of described fixed mount;
Described rotor also comprises rotor endcap, and described rotor endcap is arranged on the two ends of described rotor;
In described rotor endcap, be provided with bracket holes, described abutting stem embeds in described bracket holes.
9. non-brush permanent-magnet DC motor according to claim 8, is characterized in that:
In described rotor endcap, be also provided with the first screw hole, on described rotor core, be provided with the second screw hole; Described the first screw hole matches by screw with described the second screw hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320870395.1U CN203674831U (en) | 2013-12-25 | 2013-12-25 | Permanent-magnet DC brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320870395.1U CN203674831U (en) | 2013-12-25 | 2013-12-25 | Permanent-magnet DC brushless motor |
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| Publication Number | Publication Date |
|---|---|
| CN203674831U true CN203674831U (en) | 2014-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320870395.1U Expired - Lifetime CN203674831U (en) | 2013-12-25 | 2013-12-25 | Permanent-magnet DC brushless motor |
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| CN (1) | CN203674831U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753213A (en) * | 2013-12-25 | 2015-07-01 | 珠海格力节能环保制冷技术研究中心有限公司 | Permanent-magnet DC brushless motor |
| CN110868035A (en) * | 2019-12-02 | 2020-03-06 | 浙江科宁电机有限公司 | Permanent magnet direct current brushless motor structure of washing machine |
-
2013
- 2013-12-25 CN CN201320870395.1U patent/CN203674831U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753213A (en) * | 2013-12-25 | 2015-07-01 | 珠海格力节能环保制冷技术研究中心有限公司 | Permanent-magnet DC brushless motor |
| CN110868035A (en) * | 2019-12-02 | 2020-03-06 | 浙江科宁电机有限公司 | Permanent magnet direct current brushless motor structure of washing machine |
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