Low-speed stable high-torque stepping motor

Abstract

The utility model relates to a low-speed stable high-torque stepping motor, which comprises a stator iron core, the stator iron core is installed in the stepping motor, the stator iron core comprises an iron core outer frame and magnetic poles, the iron core outer frame is of a square structure, the number of the magnetic poles is even, the magnetic poles are evenly installed on the inner side of the iron core outer frame, and a winding cavity is formed between every two adjacent magnetic poles. The magnetic pole is located on the asymmetric center line of the iron core outer frame, and the end portion of the magnetic pole is provided with a triangular tooth shape. The angle of the magnetic pole is rotated, and the end part of the magnetic pole is designed into a triangular tooth shape, so that the magnetic flux is increased, the effects of reducing temperature rise and increasing torque are achieved, and the low-speed, stable and large-torque stepping motor is realized. According to the scheme, the magnetic pole angle of the stator core is adjusted, the tooth shape of the small teeth on the magnetic pole is optimized, the magnetic path channel is enlarged, and the motor performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor manufacturing technical field especially relates to a low speed stable big torque stepping motor. BACKGROUND

[0002] With the rapid development of industrial automation, robot technology, medical equipment and precision instrument, the performance requirement of stepping motor is also increasingly improved. The stator core is the main component of the motor, and the traditional 1.8° stepping motor stator core on the market has eight magnetic poles, which are evenly distributed in a circumferential shape, wherein four magnetic poles are perpendicular to four planes of the stator core, resulting in small magnetic path channel, which affects the motor performance. SUMMARY

[0003] The utility model discloses a low speed stable big torque stepping motor to solve the problems encountered in the above background technology.

[0004] To achieve the above object, the technical scheme of the utility model is as follows:

[0005] A low speed stable big torque stepping motor, comprising a stator core, the stator core is installed in the stepping motor, the stator core comprises a core outer frame and a magnetic pole, the core outer frame is a square structure, the magnetic pole is provided with an even number and is uniformly installed on the inner side of the core outer frame, and a winding cavity is formed between the adjacent two magnetic poles. The magnetic pole is located on the asymmetric center line of the core outer frame, and the end of the magnetic pole is provided with a tooth shape in the shape of a triangle. The magnetic pole is provided with eight, and the magnetic pole is deflected outward by 22.5 degrees according to the symmetric center line of the core outer frame.

[0006] In the above scheme, the magnetic pole comprises a magnetic conducting plate and a magnetic conducting root, the area of the magnetic conducting plate is more than 115% of the area of the same stepping motor magnetic conducting plate, and the tooth shape is located at the end of the magnetic conducting root. As a preferred scheme, the end of the magnetic conducting root is also provided with a tooth root, and the tooth root is located at the end of the adjacent two tooth shapes.

[0007] In the aspect of assembly, four ends of the core outer frame are respectively provided with weight reduction grooves, and mounting holes are arranged at the two side included angle positions of the weight reduction grooves. The core outer frame is also provided with a accessory screw hole, and a skeleton screw hole is arranged in the middle of the magnetic pole.

[0008] Compared with the prior art, the utility model has the beneficial effects that: the angle of the rotating magnetic pole is adjusted, the end of the magnetic pole is designed as a tooth shape in the shape of a triangle, the magnetic flux is increased, the temperature rise is reduced, the torque is increased, the low speed stable big torque stepping motor is realized, the angle of the magnetic pole of the stator core is adjusted, the tooth shape of the small tooth on the magnetic pole is optimized, the magnetic path channel is increased, and the performance of the motor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0009] The disclosure of the present application will be described with reference to the drawings. It should be understood that the drawings are only for illustrative purposes, and are not intended to limit the scope of protection of the present application. In the drawings, the same reference numerals are used to refer to the same parts. Among them:

[0010] Figure 1 is a structural schematic diagram of the present application;

[0011] Figure 2 is a front view structural schematic diagram of the present application;

[0012] Figure 3 is Figure 2 is an enlarged structural diagram of A part in the middle;

[0013] Figure 4 is a comparison diagram of the present application and the prior design.

[0014] Reference numerals in the figure: 1-iron core outer frame; 2-magnetic pole; 3-tooth type; 4-winding cavity; 5-magnetic conductive root; 6-weight reduction groove; 7-mounting hole; 8-fitting screw hole; 9-skeleton screw hole; 10-tooth root. DETAILED DESCRIPTION

[0015] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand, the present application will be further described in detail in conjunction with the drawings. These drawings are simplified schematic diagrams, and only illustrate the basic structure of the present application in a schematic manner, so they only show the relevant structure of the present application.

[0016] According to the technical scheme of the present application, a person skilled in the art can propose a plurality of structure modes and implementation modes which can be replaced with each other without changing the essential spirit of the present application. Therefore, the following specific embodiments and drawings are only exemplary description of the technical scheme of the present application, and should not be regarded as the whole or as the limitation or restriction of the technical scheme of the present application.

[0017] The technical scheme of the present application will be further described in detail in conjunction with the drawings and embodiments.

[0018] As Figures 1 to 4 shown, a low-speed stable large-torque stepping motor, comprising a stator core, the stator core is installed in the stepping motor, cooperates with the rotor to output torque, the stator core is packaged by a plurality of silicon steel sheets.

[0019] From Figure 2 the front view, the stator core includes an iron core outer frame 1 and a magnetic pole 2, the iron core outer frame 1 is a square structure, the magnetic pole 2 is provided with an even number of and uniformly installed on the inner side of the iron core outer frame 1, the adjacent two magnetic poles 2 form a winding cavity 4, the coil winding passes through the winding cavity 4 and is wound on the magnetic pole 2.

[0020] Please refer to Figure 4 , the magnetic pole 2 is located on the asymmetric center line of the outer frame 1 of the iron core, and the angle of the magnetic pole 2 is rotated to increase the magnetic flux, thereby reducing the temperature rise and increasing the torque. The end of the magnetic pole 2 is provided with a triangular tooth shape 3 to increase the magnetic flux and the torque of the stepping motor, further reduce the temperature rise, and make the stepping motor in a low-speed stable state.

[0021] The triangular tooth shape 3 can increase the magnetic flux area by 30% compared with the original rectangular tooth shape, so that the magnetic circuit distribution of the stepping motor is maximally widened, thereby improving the torque performance of the stepping motor and reducing the temperature rise effect. The number of tooth shapes 3 can be determined according to the original number, and only the structure is changed from the original rectangle to triangle.

[0022] In the implementation, the magnetic pole 2 is provided with eight, and the magnetic pole 2 is deflected outward by 22.5 degrees according to the symmetric center line of the outer frame 1 of the iron core. By rotating the stator core magnetic pole by 22.5° on the basis of the existing structure, high-precision numerical control processing equipment and magnetic simulation software are used to realize accurate control of the rotation angle of the stator core magnetic pole. After the magnetic pole 2 is rotated by 22.5°, the magnetic flux area can be increased by more than 15%, and the output torque of the stepping motor can be increased, thereby realizing the output of large torque.

[0023] The magnetic pole 2 includes a magnetic conducting plate and a magnetic conducting root 5. The area of the magnetic conducting plate is more than 115% of the area of the same stepping motor in the prior art. Compared with the prior art, the area of the magnetic conducting plate is increased by 15%, thereby increasing the magnetic flux area of the magnetic conducting plate. The tooth shape 3 is located at the end of the magnetic conducting root 5. The magnetic flux area is increased again after the triangular tooth shape 3 is used. The length of the magnetic conducting plate is increased from 7.78 mm to 10.1 mm under the condition that the width is unchanged, thereby increasing the magnetic flux area.

[0024] The end of the magnetic conducting root 5 is also provided with a tooth root 10. The tooth root 10 is located at the end of the adjacent two tooth shapes 3. The tooth root 10 can be about 0.5 mm, and can be selected as 0.3 mm. The tooth root 10 can enhance the low-speed stable large torque characteristics of the stepping motor, realize higher electromagnetic energy conversion efficiency, and thereby improve the performance of the stepping motor.

[0025] Four ends of the outer frame 1 of the iron core are respectively provided with a weight reduction groove 6. Installation holes 7 are arranged at both sides of the weight reduction groove 6. The weight reduction groove 6 is used for saving materials. Long screws are installed in the installation holes 7, and the front and rear end covers of the motor are fixed by cooperating with screws. The outer frame 1 of the iron core is also provided with a accessory screw hole 8 for cooperating with circuit boards and other components. A skeleton screw hole 9 is arranged in the middle of the magnetic pole 2 for sleeving a skeleton outside the magnetic pole 2.

[0026] The scheme increases the magnetic flux by rotating the angle of the magnetic pole 2 and designing the end of the magnetic pole 2 as a triangular tooth type 3, plays a role of reducing temperature rise and increasing torque, and realizes low-speed stable large torque of the stepping motor. The scheme adjusts the magnetic pole angle of the stator core, optimizes the small tooth shape on the magnetic pole, increases the magnetic circuit channel, and thus realizes the improvement of the motor performance.

[0027] The above detailed description is further detailed for the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above description is only the specific implementation of the utility model and is not used to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A low-speed smooth large torque stepper motor comprising a stator core installed in the stepper motor, the stator core comprising a core outer frame (1) in a square structure and magnetic poles (2) evenly installed on the inner side of the core outer frame (1) in an even number, characterized in that: the magnetic poles (2) are located on the asymmetric center line of the core outer frame (1), and the end of the magnetic poles (2) is provided with a tooth-shaped (3) in a triangular shape. The magnetic poles (2) are eight, and the magnetic poles (2) are deflected outward by 22.5 degrees according to the symmetric center line of the core outer frame (1).

2. A low speed smooth high torque stepper motor as claimed in claim 1, wherein: The magnetic poles (2) comprise a magnetic conducting plate and a magnetic conducting root (5), the area of the magnetic conducting plate is more than 115% of the area of the existing same stepper motor magnetic conducting plate, and the tooth-shaped (3) is located at the end of the magnetic conducting root (5).

3. A low speed smooth high torque stepper motor as claimed in claim 1, wherein: The end of the magnetic conducting root (5) is also provided with a tooth root (10) located at the end of the two adjacent tooth-shaped (3).

4. A low speed smooth high torque stepper motor as claimed in claim 3, wherein: Four ends of the core outer frame (1) are respectively provided with a weight reduction groove (6), and installation holes (7) are formed at the two side included angle positions of the weight reduction groove (6).

5. A low speed smooth high torque stepper motor as claimed in claim 1, wherein: The core outer frame (1) is also provided with a accessory screw hole (8), and the middle part of the magnetic pole (2) is provided with a skeleton screw hole (9).

6. A low speed smooth high torque stepper motor as claimed in claim 1, wherein: ​

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