CN111049347A - Sine wave driven brushless motor - Google Patents
Sine wave driven brushless motor Download PDFInfo
- Publication number
- CN111049347A CN111049347A CN202010024035.4A CN202010024035A CN111049347A CN 111049347 A CN111049347 A CN 111049347A CN 202010024035 A CN202010024035 A CN 202010024035A CN 111049347 A CN111049347 A CN 111049347A
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- China
- Prior art keywords
- hall
- circuit board
- fixed
- sine wave
- brushless motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
- H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors
-
- 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
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
- H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Brushless Motors (AREA)
Abstract
The invention aims to provide a sine wave driven brushless motor capable of realizing sine wave driving. In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a sine wave driven brushless motor, includes stator module and rotor subassembly, the rotor subassembly includes rotor core, rotor core hole department is fixed with the pivot, the rotor core circumference outside is fixed with a plurality of magnets that are the even interval of annular, the cover is established in the pivot and is fixed with the response magnetic ring, response magnetic ring cross-section is annular and with the coaxial setting of pivot, stator module is last to be fixed with the circuit board, and the circuit board has the centre bore that supplies the pivot to pass through, and is fixed with a plurality of halls on the circuit board, and a plurality of halls are around in response magnetic ring circumference outside, and the distance between hall and the outside wall of response magnetic ring circumference is the same, and the magnetic pole polarity and the position one-to-one between.
Description
Technical Field
The invention relates to a brushless motor, in particular to a sine wave driven brushless motor.
Background
In the existing brushless motor, a magnetic shoe is arranged on the circumferential outer wall of a rotor core, the magnetic shoe must be higher than the rotor core by a certain height, and a Hall sensor is arranged on a stator framework to sense a magnetic field. The brushless motor can obtain sine waves only in a specific magnetic field range, and the Hall output level is too low when the magnetic field is too low, so that a driver cannot work normally; when the magnetic field is too high, the Hall level directly outputs square waves, and the driver cannot realize sine wave driving.
The sine wave drive has higher requirement on the consistency of the Hall output level, so that the sine wave drive has higher requirement on the uniformity of the magnetic field distribution, but the matching precision between the Hall and the magnetic shoe of the existing brushless motor is lower.
Disclosure of Invention
The invention aims to provide a sine wave driven brushless motor capable of realizing sine wave driving.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a sine wave driven brushless motor, includes stator module and rotor subassembly, the rotor subassembly includes rotor core, rotor core hole department is fixed with the pivot, the rotor core circumference outside is fixed with a plurality of magnets that are the even interval of annular, the cover is established in the pivot and is fixed with the response magnetic ring, response magnetic ring cross-section is annular and with the coaxial setting of pivot, stator module is last to be fixed with the circuit board, and the circuit board has the centre bore that supplies the pivot to pass through, and is fixed with a plurality of halls on the circuit board, and a plurality of halls are around in response magnetic ring circumference outside, and the distance between hall and the outside wall of response magnetic ring circumference is the same, and the magnetic pole polarity and the position one-to-one between.
The Hall sensor is not in induction fit with the magnet but is directly matched with the induction magnetic ring, and the induction magnetic ring is annular, so that compared with a plurality of magnets which are uniformly arranged at intervals in an annular shape, the position precision is higher, the uniformity of magnetic field distribution is better, the consistency of Hall output levels is better, and the brushless motor can obtain sine waves. The induction magnetic ring can be directly fixed with the rotating shaft, can be adhered and fixed with the rotating shaft through glue, and can also be fixed with the rotating shaft in a hot-fit manner after being heated, so that the coaxial arrangement of the induction magnetic ring and the rotating shaft is realized. Because the Hall of the invention is matched with the induction magnetic ring, the magnet does not need to be arranged longer than the rotor iron core.
Preferably, the magnet on the rotor assembly and the induction magnetic ring are positioned and magnetized simultaneously. After the positioning and fixing of the magnet, the induction magnetic ring and other rotor assemblies are completed, the magnet and the induction magnetic ring are simultaneously magnetized, so that the one-to-one correspondence of the polarity and the position is realized.
Preferably, a bushing is fixed on the rotating shaft, the cross section of the bushing is annular and is sleeved and fixed on the rotating shaft, the bushing sequentially comprises a thin section and a thick section along the axial direction, and the induction magnetic ring is sleeved on the thin section and is attached to the axial surface of the thick section; the outer edge of the bushing and the inner edge of the induction magnetic ring are both circular.
Preferably, the rotating shaft is provided with a step structure, and an axial surface of one side of the thick section of the bushing, which is far away from the thin section, is in contact with an axial step surface of the rotating shaft.
The arrangement is convenient for the coaxial arrangement of the induction magnetic ring and the bushing and also convenient for the axial positioning and fixing of the induction magnetic ring. The coaxial matching between the induction magnetic ring and the rotating shaft is realized through the coaxial matching between the lining and the rotating shaft and the coaxial matching between the induction magnetic ring and the lining. The rotating shaft and the bushing can be fastened through screws, can be fixed between the bushing and the rotating shaft through glue adhesion, and can also be in thermal fit (tight fit) with the rotating shaft after the bushing is heated. Wherein, the induction magnetic ring and the bushing can be bonded and fixed by glue or thermally matched.
Preferably, the stator assembly comprises a stator, a stator framework is fixed on the stator, the stator framework and the circuit board are provided with a first positioning bulge and a first positioning groove which are matched with each other, and the circuit board and the stator framework are fixed so that the first positioning bulge is matched in the first positioning groove; the axial surface of one side of the stator framework is provided with the first positioning bulge extending along the parallel line of the axis of the rotating shaft, and the outer edge of the circuit board is provided with the first positioning groove; the first positioning bulges are arranged at intervals in a ring shape taking the axis of the rotating shaft as the center. The arrangement is used for fixing the circuit board and the stator.
Preferably, the central hole of the circuit board is coaxially arranged with the rotating shaft. The distance between the Hall sensor and the induction magnetic ring is the same through the circuit board and the rotating shaft.
Preferably, the hall is arranged at the inner edge of the circuit board. The arrangement is such that the hall and the induction magnet ring are closer together.
Preferably, circuit board inner edge department is fixed with the hall mounting bracket, and the hall mounting bracket is located circuit board axial side, be formed with the mounting groove that is used for fixing a position hall on the hall mounting bracket, the mounting groove runs through one side axial plane of keeping away from the circuit board of hall locating rack, mounting groove cross section inner edge shape is the same with hall cross section outer fringe shape, be equipped with the through-hole that a plurality of confession hall pins passed through on the axial plane that the hall mounting bracket is close to the circuit board, the through-hole axial runs through the hall mounting bracket and communicates with the mounting groove, and hall's pin passes behind the through-. The above-mentioned setting is fixed with the location that is used for hall, through hall mounting bracket with filling axial position to make hall ability be located induction magnetic ring circumference side. The shape of the inner edge of the cross section of the mounting groove is the same as that of the outer edge of the cross section of the Hall, so that the positioning and fixing of the Hall are more accurate, and the Hall is prevented from being inclined. Wherein, can adopt multiple modes such as hot melt fixed, glue is fixed, buckle is fixed to realize the fixed of hall mounting bracket and circuit board.
Preferably, the circumferential outer wall of one end, close to the circuit board side, of the Hall mounting frame is recessed to form a plurality of notches, the notches axially penetrate through the axial face, far away from the mounting groove, of the Hall mounting frame, the notches are arranged on the Hall mounting frame at annular intervals, and each mounting groove is located between two adjacent notches. The notch is formed to reduce the weight of the Hall mounting frame and reduce the contact area between the Hall mounting frame and the circuit board, so that the Hall mounting frame is prevented from being inclined due to the fact that the end face of the circuit board is uneven.
Preferably, a second positioning bulge and a second positioning groove which are matched with each other are arranged between the circuit board and the Hall mounting frame; the Hall mounting rack is provided with the second positioning bulge, and the circuit board is provided with the second positioning groove; the second positioning bulges are arranged at intervals in a ring shape taking the axis of the rotating shaft as the center. The arrangement is used for positioning and fixing the circuit board and the Hall mounting frame.
The Hall sensor is matched with the induction magnetic ring, the polarities and positions of the magnetic poles between the induction magnetic ring and the magnet are in one-to-one correspondence, the induction precision of the Hall sensor is higher, the consistency of Hall output levels is higher, and the Hall sensor has the advantage of realizing sine wave driving.
Drawings
FIG. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic view of a rotor assembly of the present invention;
FIG. 3 is a cross-sectional view of the present invention;
fig. 4 is a schematic structural diagram of a circuit board and a hall mount on a stator assembly according to the present invention.
Detailed Description
The invention is further described below with reference to the figures and specific embodiments.
As shown in fig. 1 to 4, the brushless motor driven by sine waves of the present invention includes a stator assembly and a rotor assembly, the rotor assembly includes a rotor core 1, a rotating shaft 2 is fixed at an inner hole of the rotor core 1, a plurality of magnets 3 with uniform annular intervals are fixed at the outer circumferential side of the rotor core 1, an induction magnetic ring 4 is fixed on the rotating shaft 2 in a sleeved manner, the section of the induction magnetic ring 4 is annular and is coaxial with the rotating shaft 2, a circuit board 5 is fixed on the stator assembly, the circuit board 5 has a central hole for the rotating shaft to pass through, and three hall magnets are fixed on the circuit board 5, the three hall magnets surround the outer circumferential side of the induction magnetic ring 4, the distance between the hall magnets and the outer circumferential wall of the induction magnetic ring 4 is the same, and the magnetic poles and positions of the. Wherein, the magnet 3 and the induction magnetic ring 4 on the rotor component are positioned and magnetized simultaneously.
The rotating shaft 2 is fixed with a bushing 6, the cross section of the bushing 6 is annular and is sleeved and fixed on the rotating shaft 2, the bushing 6 sequentially comprises a thin section 61 and a thick section 62 along the axial direction, the induction magnetic ring 4 is sleeved on the thin section 61 and is attached to the axial surface of the thick section 62, and the outer edge of the bushing 6 and the inner edge of the induction magnetic ring 4 are circular. The rotating shaft 2 is provided with a step structure, and the axial surface of one side of the thick section 62 far away from the thin section 61 of the bushing 6 is in contact with the axial step surface of the rotating shaft 2. The inner edge of the bush 6 and the outer edge of the rotating shaft 2 are both circular.
Wherein, the centre bore of circuit board 5 sets up with pivot 2 is coaxial, and hall sets up in circuit board inner fringe department.
Stator module includes the stator, is fixed with stator skeleton 7 on the stator, and stator skeleton 7 is equipped with the protruding 71 in first location and the first constant head tank 51 of mutually supporting with circuit board 5, and circuit board 5 is fixed with stator skeleton 7 so that the protruding 71 cooperation in first location is in first constant head tank 51 of first location, is equipped with on 7 side axial faces of stator skeleton along 2 axis of pivot extensions first protruding 71 in first location, 5 outer fringe departments of circuit board are equipped with first constant head tank 51, a plurality of first location are the even interval setting of annular that uses the 2 axis of pivot as the center.
5 inner edge departments of circuit board are fixed with hall mounting bracket 8, hall mounting bracket 8 is located 5 axial sides of circuit board, be formed with the mounting groove 81 that is used for fixing a position hall on the hall mounting bracket 8, mounting groove 81 runs through one side axial plane of keeping away from circuit board 5 of hall locating rack 8, mounting groove 81 cross section inner edge shape is the same with hall cross section outer fringe shape, hall mounting bracket 8 is equipped with the through-hole that a plurality of confession hall pins pass through on being close to the axial plane of circuit board 5, the through-hole axial runs through hall mounting bracket and communicates with mounting groove 81, hall's pin passes behind the through-hole and.
The bushing can be fixed with the rotating shaft in various modes, and the induction magnetic ring can be fixed with the bushing in various modes. Wherein, the circuit board accessible multiple mode is fixed with the hall mounting bracket. The induction magnetic ring can be an isotropic magnetic ring magnetized by a plurality of poles (the number of poles is a multiple of 2) on the excircle, and can also be an anisotropic magnetic ring; the magnetic ring can be a bonded magnetic ring formed by bonding magnetic powder with epoxy resin binder, or a sintered magnetic ring formed into a compact body by sintering. Or a multi-pole induction rotor formed by splicing magnetic rings.
The Hall sensor is matched with the induction magnetic ring, the polarities and positions of the magnetic poles between the induction magnetic ring and the magnet are in one-to-one correspondence, the induction precision of the Hall sensor is higher, the consistency of Hall output levels is higher, and the Hall sensor has the advantage of realizing sine wave driving.
Claims (10)
1. The utility model provides a sine wave driven brushless motor, its characterized in that includes stator module and rotor subassembly, the rotor subassembly includes rotor core, rotor core hole department is fixed with the pivot, the rotor core circumference outside is fixed with a plurality of magnets that are the even interval of annular, the cover is established in the pivot and is fixed with the response magnetic ring, response magnetic ring cross-section is annular and with the coaxial setting of pivot, the last circuit board that is fixed with of stator module, circuit board have the centre bore that supplies the pivot to pass through, and be fixed with a plurality of halls on the circuit board, and a plurality of halls are around outside response magnetic ring circumference, and the distance between hall and the outside wall of response magnetic ring circumference is the same, the magnetic pole polarity and the position one-to-one between response magnetic ring.
2. The sine wave driven brushless motor of claim 1, wherein magnets on said rotor assembly and induction magnet ring are positioned and magnetized simultaneously.
3. The sine wave driven brushless motor according to claim 1, wherein a bushing is fixed on the rotating shaft, the bushing has a circular cross section and is sleeved and fixed on the rotating shaft, the bushing sequentially comprises a thin section and a thick section along an axial direction, and the induction magnet ring is sleeved on the thin section and is attached to an axial surface of the thick section; the outer edge of the bushing and the inner edge of the induction magnetic ring are both circular.
4. The sine wave driven brushless motor according to claim 3, wherein the shaft is formed with a stepped structure, and an axial surface of the thick portion of the bushing, which is away from the thin portion, is in contact with an axial stepped surface of the shaft.
5. The sine wave driven brushless motor according to claim 1, wherein the stator assembly comprises a stator, a stator frame is fixed on the stator, the stator frame and the circuit board are provided with a first positioning protrusion and a first positioning groove which are matched with each other, and the circuit board and the stator frame are fixed so that the first positioning protrusion is matched in the first positioning groove;
the axial surface of one side of the stator framework is provided with the first positioning bulge extending along the parallel line of the axis of the rotating shaft, and the outer edge of the circuit board is provided with the first positioning groove;
the first positioning bulges are arranged at intervals in a ring shape taking the axis of the rotating shaft as the center.
6. The sine wave driven brushless motor according to claim 1, wherein the center hole of the circuit board is coaxially disposed with the rotation shaft.
7. The sine wave driven brushless motor of claim 1, wherein the hall is disposed at an inner edge of a circuit board.
8. The sine wave driven brushless motor according to claim 1, wherein a hall mount is fixed at an inner edge of the circuit board, the hall mount is located at an axial side of the circuit board, a mounting groove for fixing and positioning the hall is formed in the hall mount, the mounting groove penetrates through an axial face, far away from the circuit board, of the hall mount, the shape of the inner edge of the cross section of the mounting groove is the same as that of the outer edge of the cross section of the hall, a plurality of through holes for hall pins to pass through are formed in an axial face, close to the circuit board, of the hall mount, the through holes axially penetrate through the hall mount and are communicated with the mounting groove, and the hall pins are.
9. The sine wave driven brushless motor of claim 7, wherein the peripheral outer wall of the hall mount at the end near the circuit board side is recessed to form a plurality of notches, the notches axially penetrate through the axial surface of the hall mount away from the mounting grooves, the plurality of notches are annularly spaced on the hall mount, and each mounting groove is located between two adjacent notches.
10. The sine wave driven brushless motor according to claim 7, wherein a second positioning protrusion and a second positioning groove are arranged between the circuit board and the Hall mounting bracket, wherein the second positioning protrusion and the second positioning groove are matched with each other; the Hall mounting rack is provided with the second positioning bulge, and the circuit board is provided with the second positioning groove; the second positioning bulges are arranged at intervals in a ring shape taking the axis of the rotating shaft as the center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010024035.4A CN111049347A (en) | 2020-01-10 | 2020-01-10 | Sine wave driven brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010024035.4A CN111049347A (en) | 2020-01-10 | 2020-01-10 | Sine wave driven brushless motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111049347A true CN111049347A (en) | 2020-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010024035.4A Pending CN111049347A (en) | 2020-01-10 | 2020-01-10 | Sine wave driven brushless motor |
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| Country | Link |
|---|---|
| CN (1) | CN111049347A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113162333A (en) * | 2021-03-19 | 2021-07-23 | 浙江仕优驱动科技有限公司 | Brushless motor's magnetic ring encoder structure and brushless motor |
| CN117318344A (en) * | 2023-08-18 | 2023-12-29 | 珠海市双捷科技有限公司 | Combined motor |
| WO2024125577A1 (en) * | 2022-12-15 | 2024-06-20 | 浙江联宜电机有限公司 | High-precision-fitting structure of linear hall component and induction magnetic ring for brushless motor |
-
2020
- 2020-01-10 CN CN202010024035.4A patent/CN111049347A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113162333A (en) * | 2021-03-19 | 2021-07-23 | 浙江仕优驱动科技有限公司 | Brushless motor's magnetic ring encoder structure and brushless motor |
| WO2024125577A1 (en) * | 2022-12-15 | 2024-06-20 | 浙江联宜电机有限公司 | High-precision-fitting structure of linear hall component and induction magnetic ring for brushless motor |
| CN117318344A (en) * | 2023-08-18 | 2023-12-29 | 珠海市双捷科技有限公司 | Combined motor |
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