阅读说明：本技术 一种自制动电机 (Self-braking motor ) 是由 叶炜 于 2021-07-02 设计创作，主要内容包括：本发明公开了一种自制动电机,涉及电机技术领域,包括电机外壳、电机轴、电机转子和螺母,所述电机转子和所述螺母固接,所述电机轴与所述螺母螺纹连接,所述电机轴上设有第一单向轴承和第二单向轴承,所述螺母的两个端面为止动面,所述第一单向轴承和所述第二单向轴承的朝向螺母的端面均与所述止动面啮合。具有如下有益效果：在电机转子和电机轴之间增设了螺母,螺母与电机轴螺纹连接,在电机轴的两端增设了与螺母的端面啮合的单向轴承,利用螺母的轴向移动和单向轴承的作用实现电机的自制动,取消了电磁离合器以及动力元件,大大减小体积,提高了电机能效,并且采用啮合制动,无磨损件的参与,电机的制动效果好且无需高频更换磨损件。(The invention discloses a self-braking motor, which relates to the technical field of motors and comprises a motor shell, a motor shaft, a motor rotor and a nut, wherein the motor rotor is fixedly connected with the nut, the motor shaft is in threaded connection with the nut, a first one-way bearing and a second one-way bearing are arranged on the motor shaft, two end faces of the nut are stopping faces, and the end faces, facing the nut, of the first one-way bearing and the second one-way bearing are both meshed with the stopping faces. Has the following beneficial effects: the nut is additionally arranged between the motor rotor and the motor shaft and is in threaded connection with the motor shaft, the one-way bearings meshed with the end faces of the nut are additionally arranged at two ends of the motor shaft, the self-braking of the motor is realized by utilizing the axial movement of the nut and the action of the one-way bearings, the electromagnetic clutch and the power element are omitted, the size is greatly reduced, the energy efficiency of the motor is improved, the meshed braking is adopted, no wearing part is involved, the braking effect of the motor is good, and the wearing part is not required to be replaced at high frequency.)

1. The utility model provides a self-braking motor, its characterized in that, includes motor housing, motor shaft, electric motor rotor and nut, the motor shaft rotate connect in motor housing's inside, electric motor rotor with the nut rigid coupling, the motor shaft with nut threaded connection, be equipped with on the motor shaft and be located the one-way bearing of first one-way bearing and the one-way bearing of second at nut both ends, first one-way bearing with the one-way bearing's of second rotation opposite direction, two terminal surfaces of nut stop face, first one-way bearing with the one-way bearing's of second terminal surface towards the nut the terminal surface all with the stop face meshing, first one-way bearing with the one-way bearing of second all with the nut is equipped with the clearance.

2. A self-braking motor according to claim 1, wherein the outer side of the nut is provided with a first annular protrusion for axially limiting the motor rotor.

3. A self-braking electric motor according to claim 1, wherein the surface shape of said stop surface is symmetrical about the axial center of the end surface.

4. A self-braking electric motor, as claimed in claim 1, wherein said nut is of one-piece construction.

5. A self-braking electric motor, as claimed in claim 1, wherein said motor shaft is coupled to said nut by a multi-start thread.

6. The self-braking motor of claim 1, wherein the motor shaft is provided with a second annular protrusion for limiting the nut.

7. A self-braking electric motor according to claim 1, wherein a first bearing and a second bearing are connected to both ends of the motor shaft, respectively.

8. The self-braking motor according to claim 1 or 7, wherein the motor housing comprises a motor housing body, a first motor end cover and a second motor end cover, the motor housing body, the first motor end cover and the second motor end cover are fixedly connected, a first groove for fixedly connecting the first bearing and the first one-way bearing is formed in the first motor end cover, and a second groove for fixedly connecting the second bearing and the second one-way bearing is formed in the second motor end cover.

9. A self-braking electric motor according to claim 1, wherein the first motor end cap and the second motor end cap are of thin-walled construction.

10. A self-braking electric motor according to claim 1, wherein the length of said gap is greater than the height of the surface shape of said stop surface.

Technical Field

The invention relates to the technical field of motors, in particular to a self-braking motor.

Background

At present, an electromagnetic clutch is generally adopted for motor braking, and the electromagnetic clutch is an electromagnetic mechanical connector which combines or separates a driving part and a driven part which rotate in a mechanical transmission system by applying an electromagnetic induction principle and utilizing friction force between an inner friction plate and an outer friction plate. The electromagnetic clutch can be used for controlling the actions of starting, reversing, speed regulation, braking and the like of machinery, and has the advantages of simple structure, quicker action, small control energy and convenience for remote control, so the electromagnetic clutch is widely applied to various processing machines and mechanical transmission systems. In order to arrange the electromagnetic clutch and provide power for the electromagnetic clutch, a mechanism and a power element are required to be additionally arranged on the motor, so that the volume of the motor with the electromagnetic clutch is larger than that of the motor without the electromagnetic clutch, and the applicability of the motor in a compact environment is poor due to the increase of the volume. The energy efficiency of the motor with the electromagnetic clutch is lower than that of the motor without the electromagnetic clutch, the heating amount is correspondingly increased, and the damage probability of the motor is improved due to the increase of the heating amount. Because the friction plate is adopted for braking, the inner friction plate and the outer friction plate can be abraded along with the use of the friction plate, the braking torque can be reduced, even the braking failure can occur, the braking effect of the motor can be greatly reduced, and the friction plate needs to be replaced. A new solution is needed in connection with the braking of electric machines.

Disclosure of Invention

1. Technical problem to be solved by the invention

Aiming at the technical problems of overlarge volume, low energy efficiency, overlarge heat productivity and easy abrasion of a friction plate of the motor adopting the electromagnetic clutch for braking, the invention provides the self-braking motor.

2. Technical scheme

In order to solve the problems, the technical scheme provided by the invention is as follows:

the utility model provides a self-braking motor, includes motor housing, motor shaft, electric motor rotor and nut, the motor shaft rotate connect in motor housing's inside, electric motor rotor with the nut rigid coupling, the motor shaft with nut threaded connection, be equipped with on the motor shaft and be located the one-way bearing of first one-way bearing and the one-way bearing of second at nut both ends, two terminal surfaces of nut are the stopping face, first one-way bearing with the terminal surface of the one-way bearing of second towards the nut all with the meshing of stopping face, first one-way bearing with the one-way bearing of second all with the nut is equipped with the clearance.

Optionally, a first annular protrusion axially limited with the motor rotor is arranged on the outer side of the nut.

Optionally, the surface shape of the stop surface is symmetrical about the axial center of the end surface.

Optionally, the nut is of an integrally formed structure.

Optionally, the motor shaft and the nut are connected by a multi-start thread.

Optionally, the motor shaft is provided with a second annular protrusion for limiting the nut.

Optionally, both ends of the motor shaft are respectively connected with a first bearing and a second bearing.

Optionally, the motor housing includes a motor housing body, a first motor end cover and a second motor end cover, which are fixedly connected, a first groove is provided in the first motor end cover, which is fixedly connected with the first bearing and the first one-way bearing, and a second groove is provided in the second motor end cover, which is fixedly connected with the second bearing and the second one-way bearing.

Optionally, the first one-way bearing and the second one-way bearing rotate in opposite directions.

Optionally, the length of the gap is greater than the height of the surface shape of the stop face.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

according to the technical scheme provided by the invention, the nut is additionally arranged between the motor rotor and the motor shaft, the nut is in threaded connection with the motor shaft, the one-way bearings meshed with the end surfaces of the nut are additionally arranged at two ends of the motor shaft, the self-braking of the motor is realized by utilizing the axial movement of the nut and the action of the one-way bearings, the electromagnetic clutch and a power element are omitted, the size is greatly reduced, the energy efficiency of the motor is improved, the meshed braking is adopted, no wear part is involved, the braking effect of the motor is good, and the wear part does not need to be replaced at high frequency.

Drawings

Fig. 1 is a schematic structural diagram of a self-braking motor according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a nut of a self-braking motor according to an embodiment of the present invention.

1. A motor housing; 101. a first end cover of the motor; 102. a second end cover of the motor; 2. a motor stator; 3. a motor rotor; 4. a nut; 401. a stop surface; 402. a first annular protrusion; 5. a motor shaft; 501. a second annular protrusion; 6. a first bearing; 7. a first one-way bearing; 8. a second one-way bearing; 9. a second bearing.

Detailed Description

For a further understanding of the present invention, reference will now be made in detail to the embodiments illustrated in the drawings.

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. The terms first, second, and the like in the present invention are provided for convenience of describing the technical solution of the present invention, and have no specific limiting effect, but are all generic terms, and do not limit the technical solution of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; 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. The technical solutions in the same embodiment and the technical solutions in different embodiments can be arranged and combined to form a new technical solution without contradiction or conflict, and the technical solutions are within the scope of the present invention.

Examples

With reference to fig. 1-2, a self-braking motor comprises a motor housing 1, a motor shaft 5, a motor rotor 3 and a nut 4, wherein the motor shaft 5 is rotatably connected to the inside of the motor housing 1, the motor rotor 3 is fixedly connected with the nut 4, the motor shaft 5 is in threaded connection with the nut 4, the motor shaft 5 is provided with a first one-way bearing 7 and a second one-way bearing 8 which are located at two ends of the nut 4 and have opposite rotating directions, two end surfaces of the nut 4 are stopping surfaces 401, the end surfaces of the first one-way bearing 7 and the second one-way bearing 8 facing the nut 4 are both meshed with the stopping surfaces 401, and the first one-way bearing 7 and the second one-way bearing 8 are both provided with gaps with the nut 4. The motor shaft 5 rotates in the motor shell 1, and the motor stator 2 is fixedly connected in the motor shell 1 and is the same as a conventional motor in arrangement. The motor rotor 3 is connected with the motor shaft 5 through a nut 4. The motor rotor 3 is fixedly connected with the nut 4, and the motor rotor 3 and the nut 4 rotate together. The motor shaft 5 is in threaded connection with the nut 4, and the nut 4 can drive the motor shaft 5 to rotate when rotating to a certain degree. What is called, to a certain extent, a structure of a first one-way bearing 7 and a second one-way bearing 8 needs to be introduced, the first one-way bearing 7 and the second one-way bearing 8 are sleeved on the motor shaft 5 and are located at two ends of the nut 4, and gaps are arranged between the first one-way bearing 7 and the second one-way bearing 8 and the nut 4.

In this embodiment, the following braking conditions of the motor are provided:

firstly, when motor rotor 3 rotates along a first direction and drives nut 4 rotates along the first direction, because of the existence of the screw thread, nut 4 can move axially to the direction of first one-way bearing 7, and nut 4 can contact with first one-way bearing 7 after moving. Because the two end surfaces of the nut 4 are stopping surfaces 401, the end surfaces of the first one-way bearing 7 and the second one-way bearing 8 facing the nut 4 are both meshed with the stopping surfaces 401, the nut 4 and the first one-way bearing 7 form a circumferential limiting structure, the rotation direction of the first one-way bearing 7 is the same as the first direction, and at the moment, the nut 4 is separated from the second one-way bearing 8 and is not interfered by the non-return of the second one-way bearing 8, and the motor can normally operate. When the motor is powered off, the load continues to drive the motor shaft 5 to rotate along the first direction, and the motor rotor 3 becomes a driven part, so that the nut 4 moves towards the second one-way bearing 8 under the action of the threads and is meshed with the end face of the second one-way bearing 8 to form a circumferential limiting structure. Because the second one-way bearing 8 and the first one-way bearing 7 rotate in opposite directions, the motor rotor 3 is automatically locked, the motor shaft 5 is also automatically locked under the action of threads, the load stops rotating, and the motor brake is realized.

And secondly, when the motor is electrified and rotates along the second direction, the motor rotor 3 also rotates along the second direction. The second direction is opposite to the first direction. Under the action of the screw threads of the nut 4 and the motor shaft 5, the nut 4 moves towards the second one-way bearing 8 and is meshed with the end face of the second one-way bearing 8 to drive the second one-way bearing 8 to rotate together. Since the nut 4 has moved towards the second one-way bearing 8 and is separated from the first one-way bearing 7, the motor operates normally without the check interference of the first one-way bearing 7.

When the motor is powered off, the load continues to drive the motor shaft 5 to rotate along the first direction, the motor rotor 3 changes the driven part, the nut 4 moves towards the first one-way bearing 7 under the action of the threads and is meshed with the end face of the first one-way bearing 7, the motor rotor 3 is automatically locked because the first one-way bearing 7 can only rotate along the first direction, the motor shaft 5 is also automatically locked under the action of the threads, and the load stops rotating, so that the motor brake is realized.

And thirdly, when the load rotating speed is greater than the rotating speed of the motor, under the action of the threads, the nut 4 can be disengaged from the currently meshed one-way bearing and meshed with the reversed one-way bearing, and once the nut is meshed with the reversed one-way bearing, the motor is locked immediately, so that braking is realized.

And a first annular protrusion 402 axially limited with the motor rotor 3 is arranged on the outer side of the nut 4. Because the motor rotor 3 is sleeved on the nut 4, the first annular protrusion 402 can prevent the motor rotor 3 from being dislocated and axially flying out. And a second annular protrusion 501 for limiting the nut 4 is arranged on the motor shaft 5. Because the nut 4 is sleeved on the motor shaft 5, the second annular projection 501 is arranged to prevent the nut 4 from dislocation and axial flying out.

The surface shape of the stop surface 401 is symmetrical about the axial center of the end surface. In this embodiment, the surface of the stopping surface 401 is a wedge-shaped inclined surface, specifically, a continuous wedge-shaped protrusion and a continuous wedge-shaped groove which are annular and symmetrical in the center. The wedge-shaped inclined surface is only one form, and can also be a corrugated surface similar to a wave spring, so long as the nut 4 is meshed with the first one-way bearing 7 or the second one-way bearing 8, the two can not rotate relatively, and the specific end surface appearance is not limited. However, the height of the end face profile is not too high, which leads to too deep engagement, resulting in incomplete disengagement of the nut 4 from the first one-way bearing 7 or the second one-way bearing 8, and thus, the end face profile is easily partially worn out.

The nut 4 is of an integrally formed structure. The nut 4 adopts an integrated structure to improve the structural strength of the nut 4.

The motor shaft 5 is connected with the nut 4 through multi-head threads. The purpose of adopting the multi-start thread is that the thread pitch of the multi-start thread is large, the self-locking force is small, the self-locking force required at the position is small, the locking between the nut 4 and the motor shaft 5 is avoided, the axial movement cannot be realized, the thread head number, the lead and other parameters of the multi-start thread can be set as required, and the multi-start thread can rotate relative to the motor rotor 3 and can move relative to the axial direction during the rotation.

And a first bearing 6 and a second bearing 9 are respectively connected to two ends of the motor shaft 5. The motor shaft 5 is rotatably connected to the motor housing 1 via a first bearing 6 and a second bearing 9.

The motor shell 1 comprises a motor shell 1 body, a first motor end cover 101 and a second motor end cover 102 which are fixedly connected, a first groove fixedly connected with a first bearing 6 and a first one-way bearing 7 is formed in the first motor end cover 101, and a second groove fixedly connected with a second bearing 9 and a second one-way bearing 8 is formed in the second motor end cover 102. The fastening manner in this embodiment is interference fit.

The length of the gap is greater than the height of the surface shape of the stop surface 401. Due to the fact that the nut 4 has the action of needing to be separated from the first one-way bearing 7 or the second one-way bearing 8, the distance between the first one-way bearing 7 and the second one-way bearing 8 needs to accommodate the length of the nut 4 and the allowance needed by the axial movement of the nut 4, the length of the gap is larger than the height of the surface shape of the stop surface 401, and the situation that the nut 4 does not completely move axially, so that the nut 4 is not completely separated from the first one-way bearing 7 or the second one-way bearing 8 is avoided. In this embodiment, the length of clearance is greater than about 0.5mm of type inclined plane height of checking.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.