CN221531203U - A motor structure - Google Patents

Abstract

The utility model discloses a motor structure, which comprises a motor body and a brake mechanism, wherein the motor body comprises a rotating shaft, a shell and a stator arranged in the shell, the brake mechanism comprises a fixed part and a rotating part sleeved on the periphery of the rotating shaft so as to rotate along with the rotating shaft, one of the fixed part and the rotating part is an annular permanent magnet magnetic ring, and one of the fixed part and the rotating part cuts magnetic induction lines generated by the magnetic ring to realize braking; one of the fixed part and the rotating part is a conductor made of ferromagnetic material, and the conductor comprises an annular base and a protrusion protruding from the surface of the base, which is close to the magnetic ring, towards the magnetic ring.

Description

A motor structure

Technical Field

The utility model relates to the technical field of driving, in particular to a motor structure.

Background Art

As a driving device, tubular motors are widely used in rolling shutters, windows, projection screens and other fields. In order to ensure that rolling shutters stop running and immediately stay in place when the power is cut off, to prevent the pulled-up rolling shutters from sliding down due to their own weight, and to eliminate inaccurate positioning caused by the inertia of the rotor after high-speed rotation, a brake device needs to be installed in the tubular motor to improve the self-locking ability and safety of rolling shutters.

At present, the commonly used brake is a tubular motor reducer for natural braking. This natural braking has a relatively small braking force. When the rolling door moves downward, it is easy to slide down with a slight load and cannot brake. If sufficient braking force is to be achieved, the reduction ratio of the reducer must be increased. Under the condition of a certain output speed, the speed of the motor also increases at the same time. The speed of the tubular motor increases with the speed, and the sound increases, which increases the sound of the tubular motor and causes greater noise pollution to the use environment.

For this purpose, there is also a braking device, such as a drive control mechanism of a gear-driven motor disclosed in Chinese patent application number 202080080214.8, which comprises a gear-driven motor integrally formed with an electric motor and a speed change part with the drive shaft of the electric motor as an input shaft, and a braking unit for controlling the braking of the output shaft of the speed change part in various states of driving and stopping, the braking unit comprising: a rotating part, which is rotatably supported on the drive shaft of the electric motor and has a permanent magnet arranged in a circular ring shape; and a fixed part, which is fixed to the housing of the electric motor and has a permanent magnet arranged in a circular ring shape, and the permanent magnet is arranged opposite to the permanent magnet of the rotating part in a manner of having different polarities in the above-mentioned stop state.

The above-mentioned drive control mechanism uses magnetic force to achieve braking (braking) through the cooperation of the rotating part and the fixed part, both of which are permanent magnets. However, due to the high cost of the permanent magnets themselves and the limitation of the process during magnetization, it is possible that the magnetic poles do not form a regular shape according to the designed area, that is, the position of the magnetic poles in the circumferential direction cannot be guaranteed, the width of the magnetic poles cannot be guaranteed, and thus the demand for force balance cannot be met.

Utility Model Content

The technical problem to be solved by the utility model is to provide a motor structure to reduce the cost in view of the deficiencies in the above-mentioned prior art.

The technical solution adopted by the utility model to solve the above technical problems is: a motor structure, including a motor body and a brake mechanism, the motor body includes a rotating shaft, a shell and a stator arranged in the shell, the brake mechanism includes a fixed part and a rotating part sleeved on the outer periphery of the rotating shaft so as to rotate with the rotating shaft, one of the fixed part and the rotating part is an annular permanent magnet ring, and one of the fixed part and the rotating part cuts the magnetic induction line generated by the magnetic ring to achieve braking; it is characterized in that:

One of the fixed part and the rotating part is a metal body made of ferromagnetic material, and the metal body includes an annular base and a protrusion protruding from a surface of the base close to the magnetic ring toward the magnetic ring.

Preferably, the number of the protrusions is ≥2, and the protrusions are evenly spaced along the circumference of the base.

By using ferromagnetic material with protrusions instead of permanent magnets, the cost of the material itself can be reduced, and the mechanical structure (protrusion) can be easily processed and easily achieved with high precision. The width and circumferential angle of each protrusion can be strictly controlled, thereby reducing the overall cost while improving braking performance.

Preferably, according to one aspect of the utility model, the magnetic ring includes an annular magnetic ring body and magnetic pole segments formed in the magnetic ring body by radial magnetization, the number of the magnetic pole segments is not less than 2, and the polarities of the corresponding ends of adjacent magnetic pole segments that cooperate with the metal body are opposite.

Preferably, according to another aspect of the utility model, the magnetic ring includes an annular magnetic ring body and magnetic pole segments formed in the magnetic ring body in an axial magnetization manner.

According to one aspect of the utility model, along the axial direction of the rotating shaft, the two end surfaces of the rotating part are located between the two end surfaces of the fixing part.

According to another aspect of the utility model, along the axial direction of the rotating shaft, two end surfaces of the rotating part are at least partially exposed outside the fixing part.

Preferably, along the axial direction of the rotating shaft, bearings for supporting the rotating shaft are arranged at opposite ends of the housing, and the brake mechanism is located between the two bearings.

Compared with the prior art, the advantages of the utility model are: by using ferromagnetic material with protrusions to replace permanent magnets, the cost of the material itself can be reduced, and the mechanical structure (protrusion) is easy to process and can be easily achieved with high precision, and the width and circumferential angle of each protrusion can be strictly controlled, thereby reducing the overall cost and improving the braking performance.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a motor structure of a first embodiment of the utility model;

FIG2 is a cross-sectional view (radial cross-section) of the motor structure of the first embodiment of the utility model;

FIG3 is a cross-sectional view (axial cross-section) of the motor structure of the first embodiment of the utility model;

FIG4 is an exploded schematic diagram of the motor structure of the first embodiment of the utility model (with the housing hidden);

FIG5 is a brake principle diagram of the motor structure of the first embodiment of the utility model;

FIG6 is a schematic diagram of a motor structure according to the first embodiment of the present utility model, in which the rotating part has six protrusions;

FIG7 is a schematic diagram of a motor structure of the first embodiment of the utility model in which the rotating part has eight protrusions;

FIG8 is a cross-sectional view of the motor structure of the second embodiment of the utility model;

FIG9 is a cross-sectional view (radial cross-section) of the motor structure of the third embodiment of the utility model;

FIG10 is an exploded schematic diagram of the motor structure of the third embodiment of the utility model (with the housing hidden);

FIG11 is a schematic diagram of a motor structure in accordance with a third embodiment of the present utility model, in which the fixing portion has six protrusions;

FIG. 12 is a schematic diagram showing that the rotating portion of the motor structure of the third embodiment of the present utility model has eight protrusions.

DETAILED DESCRIPTION

Embodiments of the present utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present utility model can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

Referring to FIGS. 1 to 5 , a motor structure includes a motor body 1 and a brake mechanism 3. The motor body 1 includes a stator 11, a rotating shaft 12 (i.e., a rotor), and a housing 13. The stator 11 is disposed in the housing 13. The rotating shaft 12 has a first end and a second end opposite to each other in the axial direction. At least one of the first end and the second end of the rotating shaft 12 extends outside the housing 13. Along the axial direction of the rotating shaft 12, bearings 14 are disposed at both ends of the housing 13 to support the rotating shaft 12.

The brake mechanism 3 is also placed in the housing 13, between the two bearings 14. Preferably, the brake mechanism 3 can be located at the end of the housing 13 along the axial direction of the motor structure. The brake mechanism 3 includes a fixed portion 31 and a rotating portion 32, wherein the rotating portion 32 is sleeved on the outer periphery of the rotating shaft 12 and rotates synchronously with the rotating shaft 12, and the fixed portion 31 is fixed to the inner side of the peripheral wall of the housing 13. The fixed portion 31 is annular and is arranged at intervals on the outer periphery of the rotating portion 32.

The rotating part 32 is made of a ferromagnetic material that can be attracted by a permanent magnet, that is, a metal body made of a ferromagnetic material. The rotating part 32 includes a base 331 and a protrusion 332 formed on the outer periphery of the base 331. The base 331 is preferably annular, more preferably, annular, sleeved on the outer periphery of the rotating shaft 12 and fixed to the rotating shaft 12. The protrusion 332 has an outer peripheral surface of the base 331 and extends radially outward until it approaches the inner peripheral surface of the fixed part 31. The number of protrusions 332 can be selected to be ≥2, more preferably an even number not less than 2, such as 4 in this embodiment. Alternatively, as shown in Figures 6 and 7, the number of protrusions 332 can be 6 or 8, or more. The protrusions 332 are evenly spaced along the circumference of the base 321.

The fixed part 31 is a permanent magnet ring, including an annular ring body 341 and a magnetic pole segment 342 formed in the ring body 341 by magnetization. Preferably, the ring body 341 is annular. In this embodiment, it is a magnetic ring obtained by radial magnetization. The number of magnetic pole segments 342 can be no less than 2, as shown in this embodiment, it is 4, and is evenly spaced along the circumference of the ring body 341. The magnetic pole segment 342 has an end located radially inside and close to the rotating part 32 and an end located radially outside and away from the rotating part 32. The corresponding ends of adjacent magnetic pole segments 342 (such as both are ends close to the rotating part 32) have opposite polarities. For example, if one of the magnetic pole segments 342 has an N pole at its radial inner end and an S pole at its radial outer end, then the radial inner end of its adjacent magnetic pole segment 342 is an S pole and the radial outer end is an N pole.

Alternatively, the magnetic pole segment 342 can also be formed by axial magnetization, that is, the N pole and S pole of the magnetic pole segment 342 are two opposite ends along the axial direction of the rotating shaft 12. The radial magnetization and axial magnetization methods of the magnetic ring are prior arts and will not be described in detail here.

When the motor is in a stationary state, the protrusion 332 of the rotating part 32 is opposite to the magnetic pole segment 342; when the motor is powered on, the rotating part 32 overcomes the magnetic attraction of the fixed part 31 and starts to rotate with the rotating shaft 12. At this time, when the motor is powered off, the rotating shaft 12 will continue to rotate due to inertia, and the protrusion 332 cuts the magnetic induction line formed by the magnetic pole segment 342 of the fixed part 31, thereby generating a force opposite to the rotation direction of the rotating part 32 and forming a braking force (i.e. electromagnetic damping-when a conductor moves in a magnetic field, the induced current will cause the conductor to be subjected to an Ampere force, and the direction of the Ampere force always hinders the movement of the conductor). The braking force is in the tangential direction along any point of the protrusion 332, and the attraction of the magnetic field formed by the fixed part 31 on the protrusion 332 is balanced in the radial direction.

Embodiment 2

8 , in this embodiment, the difference from the above-mentioned embodiment 1 is that, along the axial direction of the rotating shaft 12, at least part of the rotating portion 32 is exposed outside the fixed portion 31. As shown in FIG11 , the rotating portion 32 is partially exposed outside the fixed portion 31, and alternatively, it can also be completely exposed outside the fixed portion 31, as long as the magnetic induction line of the fixed portion 31 can be cut.

That is, in the second embodiment, along the axial direction of the rotating shaft 12 , the two end surfaces of the rotating portion 32 are located between the two end surfaces of the fixing portion 31 . In this embodiment, at least one end surface of the rotating portion 32 is not located between the two end surfaces of the fixing portion 31 .

Embodiment 3

Referring to FIG. 9 and FIG. 10 , in this embodiment, the difference from the above-mentioned embodiment 1 or 2 is that the structures of the fixed portion 31 and the rotating portion 32 are interchanged, that is, the fixed portion 31 is made of ferromagnetic material, including a base 331 and a protrusion 332, except that the protrusion 332 protrudes radially inward from the inner circumferential surface of the base 331. The rotating portion 32 is a magnetic ring, including a magnetic ring body 341 and a magnetic pole segment 342. The number of the protrusions 332 can also be 4, 6 (FIG. 11) or 8 (FIG. 12), or more.

Claims (7)

1. A motor structure, comprising a motor body (1) and a brake mechanism (3), wherein the motor body (1) comprises a rotating shaft (12), a housing (13) and a stator (11) arranged in the housing (13), wherein the brake mechanism (3) comprises a fixed portion (31) and a rotating portion (32) sleeved on the outer periphery of the rotating shaft (12) so as to rotate with the rotating shaft (12), wherein one of the fixed portion (31) and the rotating portion (32) is an annular permanent magnet ring, and one of the fixed portion (31) and the rotating portion (32) cuts the magnetic induction lines generated by the magnetic ring to achieve braking; characterized in that: One of the fixed part (31) and the rotating part (32) is a metal body made of ferromagnetic material, and the metal body comprises an annular base (331) and a protrusion (332) protruding from a surface of the base (331) close to the magnetic ring toward the magnetic ring. 2. The motor structure according to claim 1, characterized in that: the number of the protrusions (332) is ≥ 2, and the protrusions (332) are evenly spaced along the circumference of the base (331). 3. The motor structure according to claim 1 is characterized in that: the magnetic ring includes an annular magnetic ring body (341) and magnetic pole segments (342) formed in the magnetic ring body (341) in a radially magnetized manner, the number of the magnetic pole segments (342) is not less than 2, and the polarities of the corresponding ends of adjacent magnetic pole segments (342) that cooperate with the metal body are opposite. 4. The motor structure according to claim 1 is characterized in that: the magnetic ring includes an annular magnetic ring body (341) and a magnetic pole segment (342) formed in the magnetic ring body (341) by axial magnetization. 5. The motor structure according to claim 1, characterized in that: along the axial direction of the rotating shaft (12), the two end surfaces of the rotating part (32) are located between the two end surfaces of the fixed part (31). 6. The motor structure according to claim 1, characterized in that: along the axial direction of the rotating shaft (12), two end surfaces of the rotating part (32) are at least partially exposed outside the fixed part (31). 7. The motor structure according to any one of claims 1 to 6, characterized in that: along the axial direction of the rotating shaft (12), bearings (14) for supporting the rotating shaft (12) are arranged at opposite ends of the housing (13), and the brake mechanism (3) is located between the two bearings (14).