CN217824538U

CN217824538U - External rotor motor for electric tool

Info

Publication number: CN217824538U
Application number: CN202221665979.0U
Authority: CN
Inventors: 罗礼明; 刘志刚; 康志立
Original assignee: Henan Jianghua Measure Tools Co ltd
Current assignee: Henan Jianghua Measure Tools Co ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-11-15
Anticipated expiration: 2032-06-30

Abstract

The utility model relates to an external rotor electric machine technical field especially relates to a multiaxis holds support, rotates steady external rotor electric machine for electric tool. The utility model provides an external rotor electric machine for electric tool, establishes including the rotor, the cover that inlay and be equipped with the pivot epaxial stator support and fix the stator winding on the stator support one side terminal surface of keeping away from the stator winding on the stator support inlays and is equipped with first bearing, the interior circumference department of stator winding of the opposite side terminal surface of stator support inlays and is equipped with the second bearing, the pivot is worn to establish in proper order and is fixed the inner circle of second bearing and first bearing, and the inner circle cover of third bearing is established and is fixed in the pivot in the rotor outside. The motor adopts a three-bearing supporting structure, so that the stable operation of the outer rotor is realized, and the influence of overlarge torque of the output end on the whole rotation stability is reduced.

Description

External rotor motor for electric tool

Technical Field

The utility model relates to an external rotor electric machine technical field especially relates to a multiaxis holds support, rotates steady external rotor electric machine for electric tool.

Background

The outer rotor motor is opposite to a common inner rotor motor, the rotor of the outer rotor motor is arranged outside the stator, the stator of the outer rotor motor is arranged inside the rotor, and the rotor rotates around the stator. The external rotor motor has the advantages that: compared with an inner rotor, the outer rotor has smaller volume and larger rotational inertia, so that larger torque can be generated in the rotating process. An inner rotor motor is mostly adopted in the existing electric tool, so that the existing electric tool is small in torsion, larger in size and heavier in appearance; therefore, the motor needs to be replaced by a more suitable outer rotor motor. However, most of the existing external rotor motors adopt a structure that one end is fixed and the other end is suspended, so that the stability of rotation is poor, the rotating shaft is easy to bend and deform, and the fixing mode is complex. Especially, when the output shaft is directly connected with the gearbox, the stress torque of the terminal is larger due to the transmission factor of the gearbox, so that the shaking of the motor during operation is greatly increased, and the motor is caused to lose efficacy.

SUMMERY OF THE UTILITY MODEL

The relatively poor problem of stability during for solving the external rotor electric machine transmission that exists among the prior art, the utility model provides an adopt the external rotor electric machine for electric tool that three bearings supported.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides an external rotor electric machine for electric tool, establishes including rotor, the cover that inlays and be equipped with the pivot epaxial stator support and fix the stator winding on the stator support one side terminal surface of keeping away from the stator winding on the stator support inlays and is equipped with first bearing, the stator winding of the opposite side terminal surface of stator support is interior circumference department inlays and is equipped with the second bearing, the inner circle at second bearing and first bearing is worn to establish and fixes in proper order in the pivot, and the inner circle cover of third bearing is established and is fixed in the pivot in the rotor outside.

Preferably, a frustum is integrally formed on the rotating shaft between the second bearing and the bottom of the rotor, and the frustum abuts against the inner ring of the second bearing.

Preferably, the stator support includes the base that inlays and is equipped with first bearing and the stator fixed sleeve of perpendicular to base, the bottom of stator fixed sleeve is the internal diameter that the external diameter of toper structure is greater than the stator winding for toper structure and toper structure.

Preferably, a cable fixing frame is arranged on the base.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses a first bearing, second bearing and third bearing support countershaft and rotor respectively to the even running of rotor is realized to the support of the three bearing structure of realization to the rotor, reduces the too big influence to whole rotational stability of output moment of torsion.

2. The inner ring of the second bearing is tightly jacked by the frustum, so that the positioning of the rotor is realized, the rotor and the inner ring of the second bearing are fixed together, the integrated rotation of the rotor, the rotating shaft and the inner ring of the second bearing is realized, and the rotating stability of the rotor is further improved.

3. Through the fixed cable mount on the base, be convenient for this motor cable's is fixed.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a left side view of fig. 1.

Fig. 3 isbase:Sub>A schematic view ofbase:Sub>A half-section in the direction ofbase:Sub>A-base:Sub>A in fig. 2.

Fig. 4 is a schematic diagram of the explosion structure of the present invention.

In the figure: 1. the device comprises a rotating shaft, 2, a rotor, 3, a stator support, 31, a base, 32, a stator fixing sleeve, 4, a stator winding, 5, a first bearing, 6, a second bearing, 7, a third bearing, 8, a frustum, 9 and a cable fixing frame.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like 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, and 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 therefore, should not be construed as limiting the present invention.

Example (b):

referring to fig. 1, 2, 3 and 4, an external rotor motor for an electric tool includes a rotor 2 embedded with a rotating shaft 1, a stator support 3 sleeved on the rotating shaft 1, and a stator winding 4 fixed on the stator support 3, wherein the stator winding 4 is arranged inside the rotor 2.

The rotating shaft 1 and the rotor 2 can be detachably fixed and can also be integrally formed with the rotor 2, and the rotor 2 drives the rotating shaft 1 to rotate when rotating.

The stator support 3 includes a base 31 with an internal hollow structure and a stator fixing sleeve 32 which is perpendicular to the base 31 and is integrally formed with the base, the stator winding 4 is sleeved and fixed on the outer circumference of the stator fixing sleeve 32, the bottom of the stator fixing sleeve 32 is provided with an inclined plane with a conical structure, and the outer diameter of the conical structure is larger than the inner diameter of the stator winding 4, so as to realize the positioning effect on the stator winding 4.

A first bearing 5 is embedded in an end face of one side of the base 31 far away from the stator winding 4, a second bearing 6 is embedded in a hollow structure of the stator winding 4 and an end face of the stator fixing sleeve 32, and a third bearing 7 is sleeved and fixed on the rotating shaft 1 outside the rotor 2 (i.e. on the side opposite to the rotor opening).

The outer rings of the first bearing 5, the second bearing 6 and the third bearing 7 are respectively fixed in the base 31, the stator winding 4 and the support frame (not shown in the figure), and the rotating shaft 2 respectively penetrates through and is fixed on the inner rings of the first bearing 5, the second bearing 6 and the third bearing 7 to form a rotating whole.

Integrated into one piece is equipped with frustum 8 in pivot 1 between second bearing 6 and rotor 2 bottom, and frustum 8 is towards second bearing 6, and the minimum department of external diameter on frustum 8 top is not more than the external diameter of the 6 inner circles of second bearing, and 8 inner circles of the tight second bearing of frustum top, when realizing pivot 1 location, increase pivot 1 and the contact surface of second bearing 6 realize synchronous rotation, improve rotational stability.

The base 31 is provided with a cable fixing frame 9, the cable fixing frame 9 can be a hollow structure, and a cable connected with the stator winding 4 penetrates through the cable fixing frame 9 and extends to be connected to a power supply.

When the external rotor motor works, the rotor 2 drives the rotating shaft 1 to rotate around the stator winding 4 (this is the prior art of the external rotor motor, and details are not repeated here), the rotor 2 synchronously drives the inner rings of the first, second and third bearings to rotate, three-bearing support of the rotor 2 and the rotating shaft 1 is realized, the rotating stability and accuracy are improved, and particularly, the phenomenon that the rotor 2 is unstable due to overlarge rotating torque when mechanisms such as an external gearbox are adopted is avoided, so that the rotating reliability of the rotor 2 is reduced.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an external rotor electric machine for electric tool, establishes including the rotor, the cover that inlay is equipped with the pivot epaxial stator support and fix the stator winding on the stator support, its characterized in that: the rotor comprises a stator support, a first bearing is embedded in one side end face, far away from a stator winding, of the stator support, a second bearing is embedded in the inner circumference of the stator winding on the other side end face of the stator support, the rotating shaft sequentially penetrates through and is fixed to inner rings of the second bearing and the first bearing, and an inner ring of a third bearing is sleeved and fixed on the rotating shaft on the outer side of the rotor.

2. The external rotor motor for an electric tool according to claim 1, wherein: and a frustum is integrally formed on the rotating shaft between the second bearing and the bottom of the rotor and tightly props against the inner ring of the second bearing.

3. The external rotor motor for an electric tool according to claim 1, wherein: the stator support comprises a base embedded with a first bearing and a stator fixing sleeve perpendicular to the base, and the bottom of the stator fixing sleeve is of a conical structure, and the outer diameter of the conical structure is larger than the inner diameter of the stator winding.

4. The external rotor motor for an electric tool according to claim 3, wherein: the base is provided with a cable fixing frame.