Motor framework capable of enhancing heat dissipation and stepping motor

Abstract

The utility model relates to the technical field of miniature stepping motors, and especially relates to a motor skeleton capable of enhancing heat radiation and a stepping motor, the motor skeleton comprises a stator skeleton part, a rotor cavity is formed at the axis of the stator skeleton part, and the rotor cavity is used for accommodating a rotor assembly of the motor; the stator framework part comprises plate-shaped frameworks and a cylindrical framework, the plurality of plate-shaped frameworks are fixedly connected to the outer wall of the cylindrical framework at certain intervals, winding spaces are formed at the joints of two plate-shaped frameworks and the cylindrical framework, a plurality of first through holes are formed in the side wall of the cylindrical framework, the first through holes penetrate through the rotor cavity and the winding spaces, and a plurality of second through holes are formed in the side wall of the cylindrical framework. And the rotor cavity is communicated with the winding space. In conclusion, the winding space is communicated with the rotor cavity through the first through holes in the cylindrical framework, so that airflow can circulate, heat of a winding coil is taken away, the temperature of the winding coil is reduced, the insulation performance of the winding coil is prevented from being influenced, and the service life of the winding coil is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of micro stepping motors, in particular to a motor frame and a stepping motor with enhanced heat dissipation. Background Art

[0002] Claw-pole stepper motors are widely used in a variety of intelligent mechanical fields. The claw-pole stepper motor may include a housing and a stator assembly, a rotor assembly, and a gear assembly installed inside the housing. The stator assembly includes a stator frame, a first pole plate having a plurality of first pole claws, and a second pole plate having a plurality of second pole claws. The stator frame includes a plurality of end plates, and a cylindrical wall connecting the plurality of end plates.

[0003] In a small claw-pole stepper motor, the heat generated by the motor due to energy loss is mainly concentrated in the stator winding, and part of the generated heat is dissipated through the stator frame in contact with the stator, and the other part needs to be transferred from the stator to the rotor, and then from the rotor to the stator frame to dissipate. In a small claw-pole stepper motor, since the air gap between the stator and the rotor, and between the rotor and the stator frame is very small, and the air flow is relatively poor, it is difficult to establish an effective air circulation for heat dissipation. Therefore, the heat on the stator winding is difficult to transfer, which can easily cause the stator to overheat, damage the insulation layer of the winding coil, affect the insulation performance of the coil, and then affect the performance of the motor, and even reduce the service life of the motor.

[0004] Therefore, in order to ensure the reliability of the motor, it is necessary to improve the heat dissipation capacity of the motor. Utility Model Content

[0005] The utility model aims to overcome the above-mentioned shortcomings and provide a technical solution that can solve the above-mentioned problems.

[0006] The utility model provides a motor frame with enhanced heat dissipation, comprising a stator frame part, wherein a rotor cavity is formed at the axis of the stator frame part, and the rotor cavity is used to accommodate a rotor assembly of the motor; the stator frame part comprises a plate-like frame and a cylindrical frame, a plurality of plate-like frames are respectively fixed to the outer wall of the cylindrical frame at a certain interval, a winding space is formed at the connection between the plate-like frame and the cylindrical frame, a plurality of first through holes are provided on the side wall of the cylindrical frame, and the first through holes penetrate the rotor cavity and the winding space, so that the rotor cavity and the winding space are connected.

[0007] As a further solution of the utility model: the plate-like skeleton is provided with a first plate frame and a second plate frame, the cylindrical skeleton is provided with a first side wall, the two ends of the first side wall are respectively fixed to the first plate frame and the second plate frame, thereby forming a first winding cavity, and the first side wall is provided with a plurality of first through holes, thereby connecting the first winding cavity with the rotor cavity.

[0008] As a further solution of the utility model: the plate-like skeleton is provided with a third plate frame and a fourth plate frame, the cylindrical skeleton is provided with a second side wall, the two ends of the second side wall are respectively fixedly connected to the third plate frame and the fourth plate frame, thereby forming a second winding cavity, and the second side wall is provided with a plurality of first through holes, thereby connecting the second winding cavity with the rotor cavity.

[0009] As a further solution of the present invention: the stator skeleton part also includes a pole plate assembly, the pole plate assembly is provided with a first pole plate and a second pole plate, the second plate frame, the first pole plate, the second pole plate and the third plate frame are stacked in sequence to form the whole of the stator skeleton part, the first pole plate is provided with a plurality of first pole claws, the first pole claws are bent axially toward the rotor cavity and abut against the inner wall of the first side wall; the second pole plate is provided with a plurality of second pole claws, the second pole claws are bent axially toward the rotor cavity and abut against the inner wall of the second side wall.

[0010] As a further solution of the utility model: the first through hole of the first side wall is opened at the gap where the first pole claws are spaced apart.

[0011] As a further solution of the utility model: the first through hole of the second side wall is opened at the gap where the second pole claws are spaced apart.

[0012] The utility model also provides a stepper motor, including the above-mentioned motor frame with enhanced heat dissipation, and also including a motor housing, a motor cover, wiring terminals and a wire protection box, the motor frame is installed inside the motor housing, the motor cover is installed at the open end of the motor housing, the wiring terminals are fixedly connected to the motor frame, and are used to electrically connect the winding coil inside the motor with the external cable, and the wire protection box is buckled on the motor housing to protect the wiring terminals.

[0013] As a further solution of the utility model: the motor housing is provided with a first matching pole claw corresponding to the first pole claw, the first matching pole claw is alternately arranged with the first pole claw at a certain interval, and the first through hole is arranged on the side wall of the cylindrical frame corresponding to the first matching pole claw.

[0014] As a further solution of the utility model: there is a certain gap between the first matching pole claw and the inner wall of the side wall of the cylindrical frame, so that airflow can pass through.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. By arranging a first through hole on the cylindrical frame, the rotor cavity and the winding space can be connected, so that the airflow can pass through the first through hole to enter the winding space, or exit from the winding space, thereby taking away the heat of the winding coil in the winding space, reducing the temperature of the winding coil, thereby avoiding damage to the insulation layer of the winding coil, thereby preventing the insulation performance of the coil from being affected, and preventing the performance or life of the motor from being affected.

[0017] 2. A first through hole may be opened on the first side wall alone, or on the second side wall alone, or on both the first side wall and the second side wall at the same time, thereby further improving the connecting channel between the winding space and the rotor cavity, increasing the speed and total amount of gas flow, and further improving the heat dissipation efficiency.

[0018] 3. A certain gap can also be set between the first mating pole claw of the stepper motor and the side wall of the cylindrical frame, so that airflow can penetrate into the motor from the outside, and further penetrate into the winding space to cool the winding coil, reduce its temperature and improve its stability.

[0019] Therefore, after the above-mentioned improvements, the utility model can provide a motor frame and stepper motor with enhanced heat dissipation, and utilize the first through hole on the cylindrical frame to connect the winding space with the rotor cavity, so that air flow can flow, thereby taking away the heat of the winding coil, reducing its temperature, preventing its insulation performance from being affected, and extending its service life.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 It is a schematic diagram of the overall structure of the stepping motor of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the rotor chamber of the utility model;

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the winding space of the utility model;

[0025] Figure 4It is a structural schematic diagram of the first through hole and the second through hole of the utility model.

[0026] The reference numerals and names in the figures are as follows:

[0027] 10 stepper motor; 11 motor housing; 12 first mating pole claw; 13 motor cover; 14 terminal; 15 wire protection box; 16 second through hole; 20 motor frame; 21 stator frame; 22 rotor cavity; 23 winding space; 24 first winding cavity; 25 second winding cavity; 30 plate-shaped frame; 31 first plate frame; 32 second plate frame; 33 third plate frame; 34 fourth plate frame; 40 tubular frame; 41 first through hole; 42 first side wall; 43 second side wall; 50 pole plate assembly; 51 first pole plate; 52 first pole claw; 53 second pole plate; 54 second pole claw. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0029] See also Figures 1 to 4 In an embodiment of the utility model, a motor skeleton with enhanced heat dissipation includes a stator skeleton portion 21, a rotor cavity 22 is formed at the axis of the stator skeleton portion 21, and the rotor cavity 22 is used to accommodate the rotor assembly of the motor; the stator skeleton portion 21 includes a plate skeleton 30 and a cylindrical skeleton 40, and a plurality of plate skeletons 30 are respectively fixed to the outer wall of the cylindrical skeleton 40 at a certain interval, wherein the connection between two plate skeletons 30 and the cylindrical skeleton 40 forms a winding space 23, and the side wall of the cylindrical skeleton 40 is provided with a plurality of first through holes 41, and the first through holes 41 penetrate the rotor cavity 22 and the winding space 23, so that the rotor cavity 22 and the winding space 23 are connected.

[0030] Specifically, the existing methods for improving the heat dissipation of the motor stator are mostly divided into two types: one is to increase the disturbance of the air around the outer wall of the stator frame and the rotor frame by adding an additional fan outside the motor structure, and to increase the flow speed of the airflow to improve the heat dissipation efficiency of the motor; the other is to increase the heat dissipation ribs on the stator frame or the rotor frame, and to increase the heat dissipation area of ​​the outer wall of the motor to improve the heat dissipation efficiency of the motor. However, adding fans or heat dissipation ribs will increase the weight of the motor, and in particular, the fan will further increase its vibration intensity, which is not conducive to the normal installation and use of the small or micro stepper motor 10.

[0031] Secondly, by setting the first through hole 41 on the cylindrical skeleton 40, the airflow channel can be increased, so that the airflow in the winding space 23 can be exchanged with the airflow in the rotor cavity 22, thereby enhancing the heat dissipation performance of the winding space 23 and reducing the temperature of the winding coil, thereby reducing the risk of insulation layer shedding caused by coil overheating, maintaining the performance of the motor, and improving its service life. The connected winding space 23 and the rotor cavity 22 can form an airflow channel, so that the airflow generated by the rotating rotor assembly can pass through the first through hole 41 and blow on the copper wire in the winding space 23, thereby taking away the heat generated on the copper wire. At the same time, the setting of the first through hole 41 can also save the production materials of the stator skeleton part 21 to a certain extent and reduce the production cost.

[0032] In addition, a second through hole 16 can be provided at the position where the first matching pole claw 12 is provided in the motor housing 11, so that the airflow in the rotor cavity 22 or the airflow in the winding space 23 can be exchanged with the external airflow through the second through hole 16, thereby further enhancing the cooling effect of the airflow. Usually, the first matching pole claw 12 of the motor housing 11 is manufactured by a stamping process in the existing process, so when the first matching pole claw 12 is stamped out on the housing, a through hole is generated itself, so this through hole can be used as the second through hole 16, thereby reducing the production cost.

[0033] like Figure 4 As shown, preferably, the plate-like frame 30 is provided with a first plate frame 31 and a second plate frame 32, and the cylindrical frame 40 is provided with a first side wall 42, and the two ends of the first side wall 42 are respectively fixed to the first plate frame 31 and the second plate frame 32, so as to form a first winding cavity 24, and the first side wall 42 is provided with a plurality of first through holes 41, so that the first winding cavity 24 is connected to the rotor cavity 22. The plate-like frame 30 is provided with a third plate frame 33 and a fourth plate frame 34, and the cylindrical frame 40 is provided with a second side wall 43, and the two ends of the second side wall 43 are respectively fixed to the third plate frame 33 and the fourth plate frame 34, so as to form a second winding cavity 25, and the second side wall 43 is provided with a plurality of first through holes 41, so that the second winding cavity 25 is connected to the rotor cavity 22.

[0034] Specifically, due to the characteristics of the stepper motor 10, two coil windings need to be wound, so the first through hole 41 can also be set in the first winding cavity 24 and the second winding cavity 25 of the two coil windings. Of course, since the second winding cavity 25 is closer to the inside of the stepper motor 10, the amount of airflow exchange between the first through hole 41 set on the second side wall 43 and the outside is relatively small, and the heat dissipation performance will not be significantly improved, so the first through hole 41 may not be set on the second side wall 43 of the second winding cavity 25.

[0035] like Figure 4As shown, preferably, the stator frame part 21 further includes a pole plate assembly 50, the pole plate assembly 50 is provided with a first pole plate 51 and a second pole plate 53, the second plate frame 32, the first pole plate 51, the second pole plate 53 and the third plate frame 33 are stacked in sequence to form the whole of the stator frame part 21, the first pole plate 51 is provided with a plurality of first pole claws 52, the first pole claws 52 are bent in the axial direction of the rotor cavity 22, and abut against the inner wall of the first side wall 42; the second pole plate 53 is provided with a plurality of second pole claws 54, the second pole claws 54 are bent in the axial direction of the rotor cavity 22, and abut against the inner wall of the second side wall 43. The first through hole 41 of the first side wall 42 is opened at the gap where the first pole claws 52 are spaced apart. The first through hole 41 of the second side wall 43 is opened at the gap where the second pole claws 54 are spaced apart.

[0036] Similarly, due to the inherent characteristics of the stepper motor 10, it is also necessary to set a corresponding pole plate assembly 50 on the stator frame part 21, and use the second plate frame 32 and the third plate frame 33 to clamp and isolate the pole plate assembly 50. The corresponding pole claws also need to be bent accordingly according to the characteristics of the stepper motor 10 in the prior art. Moreover, the pole claws are usually made of the plate-like frame 30 and the cylindrical frame 40 of the stator frame part 21 using the integral injection molding process in the prior art, so that the pole claws can be injection-molded and wrapped inside. Therefore, there is usually no gap between the pole claws and the cylindrical frame 40, so the first through hole 41 is preferably arranged on the plastic part between the two pole claws so that it will not be blocked by the pole claws.

[0037] like Figure 1 and Figure 2 As shown, preferably, a stepper motor includes the above-mentioned motor skeleton 20, and also includes a motor housing 11, a motor cover 13, a wiring terminal 14 and a wire protection box 15, wherein the motor skeleton 20 is installed inside the motor housing 11, the motor cover 13 is installed at the open end of the motor housing 11, the wiring terminal is fixedly connected to the motor skeleton 20, and is used to electrically connect the winding coil inside the motor with the external cable, and the wire protection box 15 is snapped onto the motor housing 11 to protect the wiring terminal.

[0038] Specifically, for a complete stepper motor 10, other accessories such as a motor housing 11, a motor cover 13, wiring terminals 14, a wire protection box 15, a speed regulating gear (not shown in the figure) are also needed to work together to form a stepper motor 10 as a whole.

[0039] like Figure 3 and Figure 4As shown, preferably, the motor housing 11 is provided with a first matching pole claw 12 corresponding to the first pole claw 52, ​​the first matching pole claw 12 and the first pole claw 52 are alternately arranged at a certain interval, and the first through hole 41 is arranged on the side wall of the cylindrical frame 40 corresponding to the first matching pole claw 12. The first matching pole claw 12 is spaced a certain distance from the inner wall of the side wall of the cylindrical frame 40, so that airflow can pass through.

[0040] Specifically, similarly, due to the needs of the characteristics of the stepper motor 10 itself, the motor housing 11 also needs to be provided with a first matching pole claw 12, and it is alternately provided with the first pole claw 52. Since the first matching pole claw 12 is provided on the motor housing 11, there is usually a certain gap between it and the inner wall of the cylindrical frame 40 of the stator frame part 21, so that when the rotor assembly is running, the airflow driven can pass through the gap, and then through the second through hole 16 on the motor housing 11, the winding space 23, the rotor cavity 22 and the external space can be connected, so that the airflow can circulate and exchange with each other. After the hot airflow in the winding space 23 is exchanged, the temperature of the coil winding inside the winding space 23 can be reduced, thereby avoiding damage to the insulation layer of the winding coil, thereby preventing the insulation performance of the coil from being affected, and preventing the performance or life of the motor from being affected. Therefore, the heat dissipation performance of the micro or small stepper motor 10 can be enhanced, thereby improving the service life of the stepper motor 10.

[0041] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A motor frame with enhanced heat dissipation, characterized in that: The invention comprises a stator frame part (21), wherein a rotor cavity (22) is formed at the axis of the stator frame part (21), and the rotor cavity (22) is used to accommodate the rotor assembly of the motor; the stator frame part (21) comprises a plate-like frame (30) and a cylindrical frame (40), and a plurality of plate-like frames (30) are respectively fixed to the outer wall of the cylindrical frame (40) at a certain interval, and a winding space (23) is formed at the connection between the plate-like frame (30) and the cylindrical frame (40), and a plurality of first through holes (41) are provided on the side wall of the cylindrical frame (40), and the first through holes (41) penetrate the rotor cavity (22) and the winding space (23), so that the rotor cavity (22) and the winding space (23) are connected.

2. A motor frame for enhancing heat dissipation according to claim 1, characterized in that: The plate-like frame (30) is provided with a first plate frame (31) and a second plate frame (32), and the cylindrical frame (40) is provided with a first side wall (42). The two ends of the first side wall (42) are respectively fixed to the first plate frame (31) and the second plate frame (32), thereby forming a first winding cavity (24), and the first side wall (42) is provided with a plurality of first through holes (41), so that the first winding cavity (24) is connected with the rotor cavity (22).

3. A motor frame for enhancing heat dissipation according to claim 2, characterized in that: The plate-like frame (30) is provided with a third plate frame (33) and a fourth plate frame (34), and the cylindrical frame (40) is provided with a second side wall (43). The two ends of the second side wall (43) are respectively fixed to the third plate frame (33) and the fourth plate frame (34), thereby forming a second winding cavity (25). The second side wall (43) is provided with a plurality of first through holes (41), thereby connecting the second winding cavity (25) with the rotor cavity (22).

4. A motor frame for enhancing heat dissipation according to claim 3, characterized in that: The stator frame part (21) further comprises a pole plate assembly (50), wherein the pole plate assembly (50) is provided with a first pole plate (51) and a second pole plate (53), and the second plate frame (32), the first pole plate (51), the second pole plate (53) and the third plate frame (33) are stacked in sequence to form the whole of the stator frame part (21), wherein the first pole plate (51) is provided with a plurality of first pole claws (52), wherein the first pole claws (52) are bent in the axial direction of the rotor cavity (22) and abut against the inner wall of the first side wall (42); and the second pole plate (53) is provided with a plurality of second pole claws (54), wherein the second pole claws (54) are bent in the axial direction of the rotor cavity (22) and abut against the inner wall of the second side wall (43).

5. A motor frame for enhancing heat dissipation according to claim 4, characterized in that: The first through holes (41) of the first side wall (42) are opened at the gaps where the first pole claws (52) are spaced apart.

6. The motor frame for enhancing heat dissipation according to claim 4, characterized in that: The first through holes (41) of the second side wall (43) are opened at the gaps where the second pole claws (54) are spaced apart.

7. A stepping motor, characterized in that: A motor frame with enhanced heat dissipation comprising any one of claims 1 to 6, further comprising a motor housing (11), a motor cover (13), a wiring terminal (14) and a wire protection box (15), wherein the motor frame is installed inside the motor housing (11), the motor cover (13) is installed at the open end of the motor housing (11), the wiring terminal is fixedly connected to the motor frame and is used to electrically connect the winding coil inside the motor with the external cable, and the wire protection box (15) is buckled on the motor housing (11) and is used to protect the wiring terminal.

8. A stepping motor according to claim 7, characterized in that: The motor housing (11) is provided with a first matching pole claw (12) corresponding to the first pole claw (52), the first matching pole claw (12) and the first pole claw (52) are alternately arranged at a certain interval, and the first through hole (41) is arranged on the side wall of the cylindrical frame (40) corresponding to the first matching pole claw (12).

9. A stepping motor according to claim 8, characterized in that: There is a certain gap between the first matching pole claw (12) and the inner wall of the side wall of the cylindrical frame (40), so that airflow can pass through.

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