CN114583886A - Permanent magnet direct drive motor - Google Patents
Permanent magnet direct drive motor Download PDFInfo
- Publication number
- CN114583886A CN114583886A CN202210237337.9A CN202210237337A CN114583886A CN 114583886 A CN114583886 A CN 114583886A CN 202210237337 A CN202210237337 A CN 202210237337A CN 114583886 A CN114583886 A CN 114583886A
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- Prior art keywords
- output shaft
- permanent magnet
- drive motor
- bearing
- assembly
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention relates to the technical field of motors, in particular to a permanent magnet direct drive motor which comprises a motor shell, an output shaft, a first bearing, a second bearing, a stator component, a rotor component and a planet wheel component, wherein the output shaft is connected with the first bearing; the motor shell is provided with a cylindrical mounting cavity; the output shaft is rotatably arranged on the motor shell through a first bearing; the second bearing is sleeved on the output shaft; the stator assembly is arranged on the inner wall of the mounting cavity; the rotor assembly is sleeved on the second bearing, is positioned in the stator assembly and is arranged at intervals with the stator assembly; the planet wheel assembly is disposed in the mounting cavity and is located at an end proximate to the output end of the output shaft. The permanent magnet direct drive motor breaks through division and separation of traditional industries, integrates the motor, the coupler and the reducer, does not need to be provided with coupling devices such as a coupler, greatly reduces the complexity of a prime power transmission system compared with a traditional power transmission device, and solves various problems of type selection, matching, installation, debugging and the like among all parts of the original system.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a permanent magnet direct drive motor.
Background
In an industrial power transmission device, most of the working power of a main machine is obtained by converting electric energy into mechanical energy by an asynchronous motor, transmitting the mechanical energy to a speed reducer by a coupler and adjusting the energy state (changing the rotating speed and the torque) by the speed reducer.
In most industrial power transmission devices, there are three independent links, which are an asynchronous motor, a coupler and a reducer. The three parts are purchased by different professionals in a type selection way, then designed and produced by different manufacturers according to respective standards, and finally sent to the field for installation and debugging respectively. The power transmission system is complex, the assembly links are numerous, the improper matching, the interface error and the error are easy to occur, and further the problems of low system efficiency, large vibration, large noise, unreliable operation and the like are caused.
Disclosure of Invention
The invention aims to provide a permanent magnet direct drive motor which can solve the problems of low system efficiency, large vibration, large noise, unreliable operation and the like caused by the fact that an existing transmission system is complex in system, numerous in assembly links, improper in matching, wrong in interface and large in error.
In order to achieve the purpose, the invention adopts the following technical scheme:
a permanent magnet direct drive motor comprising:
a motor housing having a cylindrical mounting cavity;
the output shaft is rotationally arranged on the motor shell through a first bearing;
the second bearing is sleeved on the output shaft;
the stator assembly is arranged on the inner wall of the mounting cavity;
the rotor assembly is sleeved on the second bearing, is positioned in the stator assembly and is arranged at intervals with the stator assembly;
the planet wheel assembly is arranged in the mounting cavity and located at one end close to the output end of the output shaft, the planet wheel assembly comprises a sun wheel, a planet wheel, a gear ring and a planet wheel carrier, the rotor assembly is in transmission connection with the sun wheel, the gear ring is fixedly connected with the cavity wall of the mounting cavity, the sun wheel drives the planet wheel to further drive the planet wheel carrier to rotate, the planet wheel carrier is in transmission connection with the output shaft, the sun wheel and the output shaft are coaxially arranged and are not in contact with each other, and the planet wheel assembly and the rotor assembly share the output shaft.
Preferably, the rotor assembly comprises a permanent magnet and a rotor support, the rotor support is sleeved on the second bearing, the permanent magnet is sleeved on the rotor support, and the rotor support is in transmission connection with the sun gear.
Preferably, the rotor support and the sun gear are in spline transmission.
Preferably, the planet carrier and the output shaft are in spline transmission.
Preferably, the motor shell comprises an end cover, a cylindrical shell and a tail cover which are connected in sequence.
Preferably, the two first bearings are respectively arranged on the end cover and the tail cover.
Preferably, a shaft shoulder is provided on the output shaft, and the sun gear is located between the shaft shoulder and the second bearing.
Preferably, the planet wheels are provided with four.
Preferably, any two adjacent planet wheels are spaced 90 degrees apart in the direction of rotation.
Preferably, the stator assembly is encapsulated by resin glue.
The invention has the beneficial effects that: the permanent magnet direct drive motor provided by the embodiment breaks through division and gap of the traditional industry, the motor, the coupler and the reducer are perfectly fused, the planetary wheel assembly serves as the reducer, the rotor assembly directly drives the planetary wheel assembly to further drive the output shaft, coupling devices such as the coupler are not needed to be arranged, compared with a traditional power transmission device, the permanent magnet direct drive motor can replace the original three products, the complexity of a prime power transmission system is greatly reduced, and various problems of type selection, matching, installation, debugging and the like among all parts of the original system are solved. The permanent magnet direct drive motor provided by the embodiment has the characteristics of small volume, light weight, high efficiency, low noise, reliable operation, good controllability and strong overload capacity; the rotor assembly and the planet wheel assembly share the output shaft, so that the design precision is effectively improved, the processing difficulty is reduced, and the coaxiality of the whole driving system is ensured; the planet wheel assembly is arranged in the mounting cavity and is positioned at one end close to the output end of the output shaft, so that a transmission chain is shortened, and the torque density of the planet wheel assembly is improved; the matching parameters of the planet wheel assembly can be flexibly selected according to the actual output condition, and the system performance is optimized.
Drawings
Fig. 1 is a sectional view of the overall structure of a permanent magnet direct drive motor of the present invention.
In the figure:
1. a motor housing; 11. an end cap; 12. a cylindrical shell; 13. a tail cover; 100. a mounting cavity;
2. an output shaft; 21. a first bearing; 22. a shaft shoulder;
3. a second bearing;
4. a stator assembly;
5. a rotor assembly; 51. a permanent magnet; 52. a rotor support;
6. a planet wheel assembly; 61. a sun gear; 62. a planet wheel; 63. a ring gear; 64. and a planet wheel carrier.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1, the present invention provides a permanent-magnet direct drive motor, which includes a motor housing 1, an output shaft 2, a first bearing 21, a second bearing 3, a stator assembly 4, a rotor assembly 5, and a planet wheel assembly 6; the motor housing 1 has a cylindrical mounting cavity 100; the output shaft 2 is rotatably arranged on the motor shell 1 through a first bearing 21; the second bearing 3 is sleeved on the output shaft 2, in the embodiment, two first bearings 21 and two second bearings 3 are arranged, in other embodiments, the number of the first bearings 21 and the number of the second bearings 3 can be set according to specific requirements, and no excessive limitation is made herein; the stator assembly 4 is arranged on the inner wall of the mounting cavity 100; the rotor assembly 5 is sleeved on the second bearing 3, and the rotor assembly 5 is positioned in the stator assembly 4 and is arranged at intervals with the stator assembly 4; planet wheel subassembly 6 sets up in installation cavity 100 and is located the one end of being close to the output of output shaft 2, planet wheel subassembly 6 includes sun gear 61, planet wheel 62, ring gear 63 and planet wheel carrier 64, rotor subassembly 5 transmission is connected in sun gear 61, ring gear 63 fixed connection is in the chamber wall of installation cavity 100, sun gear 61 drives planet wheel 62 and then drives planet wheel carrier 64 and rotate, planet wheel carrier 64 is connected with output shaft 2 transmission, sun gear 61 sets up with output shaft 2 coaxial line and mutual contactless, the clearing hole has been seted up on the sun gear 61, output shaft 2 passes and does not contact rather than from the clearing hole, planet wheel subassembly 6 shares output shaft 2 with rotor subassembly 5, make planet wheel subassembly 6 coincide with rotor subassembly 5 and output shaft 2's axis, the rotational uniformity of device is good.
The permanent magnet direct drive motor provided by the embodiment breaks division and alienation of the traditional industry, perfectly integrates the motor, the coupler and the speed reducer, acts as the speed reducer through the planet wheel assembly 6, the rotor assembly 5 directly drives the planet wheel assembly 6 to further drive the output shaft 2, and coupling devices such as a coupler are not required to be arranged. The permanent magnet direct drive motor provided by the embodiment has the characteristics of small volume, light weight, high efficiency, low noise, reliable operation, good controllability and strong overload capacity; the rotor assembly 5 and the planet wheel assembly 6 share the output shaft 2, so that the design precision is effectively improved, the processing difficulty is reduced, and the coaxiality of the whole driving system is ensured; the planet wheel assembly 6 is arranged in the mounting cavity 100 and is positioned at one end close to the output end of the output shaft 2, so that a transmission chain is shortened, and the torque density of the planet wheel assembly 6 is improved; the matching parameters of the planet wheel assembly 6 can be flexibly selected according to the actual output condition, and the system performance is optimized.
Specifically, the rotor assembly 5 includes a permanent magnet 51 and a rotor bracket 52, the rotor bracket 52 is sleeved on the second bearing 3, the permanent magnet 51 is sleeved on the rotor bracket 52, the rotor bracket 52 is in transmission connection with the sun gear 61, the permanent magnet 51 can provide a necessary air gap magnetic field for the motor, the permanent magnet 51 is fixed on the rotor bracket 52, a three-phase alternating current is introduced into a winding on the stator assembly 4, and a rotating magnetic field is formed in the winding after the current is introduced into the winding, because the permanent magnet 51 is installed on the rotor bracket 52, the magnetic pole of the permanent magnet 51 is fixed, according to the principle that like poles attract each other and opposite poles repel each other, the rotating magnetic field generated in the stator assembly 4 drives the permanent magnet 51 to rotate, and because the permanent magnet 51 is fixedly connected with the rotor bracket 52, the rotor bracket 52 is driven to rotate, and the electric energy is converted into mechanical energy.
Specifically, the rotor support 52 and the sun gear 61 are in spline transmission, the planet carrier 64 and the output shaft 2 are in spline transmission, and the spline transmission has the advantages of high bearing capacity, symmetrical arrangement of spline teeth, uniform stress, high centering precision, good guiding performance and the like.
Specifically, the motor housing 1 includes an end cover 11, a cylindrical shell 12 and a tail cover 13 connected in sequence, the two first bearings 21 are respectively disposed on the end cover 11 and the tail cover 13, further, both the end cover 11 and the tail cover 13 are connected to the cylindrical shell 12 through bolts, and a sealing ring may be disposed at a connection position of the end cover 11 and the cylindrical shell 12 and a connection position of the tail cover 13 and the cylindrical shell 12.
Specifically, the output shaft 2 is provided with a shaft shoulder 22, and the sun gear 61 is positioned between the shaft shoulder 22 and the second bearing 3, so that the transmission is prevented from being influenced by the axial position shift of the sun gear 61.
Specifically, in this embodiment, the planet gears 62 are four, any two adjacent planet gears 62 are spaced by 90 degrees in the rotation direction, so that the planet gear carrier 64 can be ensured to stably output power to the output shaft 2, and in other embodiments, the specific number of the planet gears 62 may also be set according to actual conditions, which is not limited herein.
Specifically, the windings in the stator assembly 4 are encapsulated by resin glue, and the resin glue has the characteristics of water resistance, oil resistance and high temperature resistance, so that the water resistance, oil resistance and high temperature resistance of the stator portion are improved. Sufficient lubricating oil is injected into the permanent-magnet direct-drive motor to lubricate the planet wheel assembly 6, the lubricating oil is in full contact with the stator assembly 4 and the rotor assembly 5, and meanwhile, the heat dissipation capacity of the whole motor is improved.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A permanent magnet direct drive motor, comprising:
a motor housing (1) having a cylindrical mounting cavity (100);
an output shaft (2) rotatably provided to the motor housing (1) via a first bearing (21);
the second bearing (3) is sleeved on the output shaft (2);
the stator assembly (4) is arranged on the inner wall of the mounting cavity (100);
the rotor assembly (5) is sleeved on the second bearing (3), and the rotor assembly (5) is positioned in the stator assembly (4) and is arranged at intervals with the stator assembly (4);
the planet wheel assembly (6) is arranged in the installation cavity (100) and located at one end close to the output end of the output shaft (2), the planet wheel assembly (6) comprises a sun wheel (61), a planet wheel (62), a gear ring (63) and a planet wheel carrier (64), the rotor assembly (5) is in transmission connection with the sun wheel (61), the gear ring (63) is fixedly connected with the cavity wall of the installation cavity (100), the sun wheel (61) drives the planet wheel (62) to further drive the planet wheel carrier (64) to rotate, the planet wheel carrier (64) is in transmission connection with the output shaft (2), the sun wheel (61) and the output shaft (2) are coaxially arranged and are not in contact with each other, and the planet wheel assembly (6) and the rotor assembly (5) share the output shaft (2).
2. The permanent-magnet direct-drive motor according to claim 1, wherein the rotor assembly (5) comprises a permanent magnet (51) and a rotor support (52), the rotor support (52) is sleeved on the second bearing (3), the permanent magnet (51) is sleeved on the rotor support (52), and the rotor support (52) is in transmission connection with the sun wheel (61).
3. The permanent magnet direct drive motor according to claim 2, characterized in that the rotor support (52) and the sun gear (61) are in spline transmission.
4. The permanent magnet direct drive motor according to claim 1, characterized in that the planetary carrier (64) and the output shaft (2) are in spline transmission.
5. The permanent magnet direct drive motor according to claim 1, characterized in that the motor housing (1) comprises an end cover (11), a cylindrical shell (12) and a tail cover (13) connected in sequence.
6. The permanent magnet direct drive motor according to claim 5, characterized in that two first bearings (21) are arranged on the end cover (11) and the tail cover (13), respectively.
7. A permanent magnet direct drive motor according to claim 1, characterized in that a shaft shoulder (22) is provided on the output shaft (2), the sun wheel (61) being located between the shaft shoulder (22) and the second bearing (3).
8. A permanent-magnet direct drive motor according to claim 1, characterized in that the planet wheels (62) are provided with four.
9. The permanent magnet direct drive motor according to claim 8, characterized in that any two adjacent planet wheels (62) are spaced 90 degrees apart in the direction of rotation.
10. A permanent magnet direct drive motor according to any of claims 1-9, characterized in that the stator assembly (4) is encapsulated with resin glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210237337.9A CN114583886A (en) | 2022-03-11 | 2022-03-11 | Permanent magnet direct drive motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210237337.9A CN114583886A (en) | 2022-03-11 | 2022-03-11 | Permanent magnet direct drive motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114583886A true CN114583886A (en) | 2022-06-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210237337.9A Pending CN114583886A (en) | 2022-03-11 | 2022-03-11 | Permanent magnet direct drive motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114583886A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11912424B1 (en) * | 2022-10-06 | 2024-02-27 | Archer Aviation Inc. | Systems and methods for improved gearboxes for eVTOL aircraft |
-
2022
- 2022-03-11 CN CN202210237337.9A patent/CN114583886A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11912424B1 (en) * | 2022-10-06 | 2024-02-27 | Archer Aviation Inc. | Systems and methods for improved gearboxes for eVTOL aircraft |
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