A two-phase eight-pole hybrid stepping motor

Abstract

The present invention relates to a two-phase eight-pole hybrid stepping motor comprising stator laminations, two-phase windings, and rotor laminations. The stator laminations are provided with eight stator poles distributed along the circumference, and the rotor laminations are provided with n rotor teeth evenly distributed along the circumference, where n = 4 × (2 × k + 1), k is an integer, and the step angle is θ = 360° / (4 × n). Compared with the prior art, the present invention has the advantages of increasing the number of teeth on the stator poles within the same space, thereby improving space utilization.

Description

Technical Field

[0001] The present invention relates to a hybrid stepping motor, in particular to a two-phase eight-pole hybrid stepping motor. Background Art

[0002] At present, stepper motors are widely used in motion control equipment such as textile equipment, printers, security equipment and CNC processing equipment. The degree of automation in factories is getting higher and higher, and the application occasions of stepper motors are becoming more and more extensive.

[0003] The current conventional two-phase hybrid stepper motor has a step angle of 1.8° or 0.9°. Conventional stepper motors cannot meet the application requirements of some occasions. For example, in order to increase the output of textile equipment, the equipment's movement speed needs to be accelerated. At this time, the original motor size is difficult to meet the speed increase requirements of the equipment without changing the structural dimensions.

[0004] Currently, a motor stator pole with a step angle of 0.9° requires four structures and has low space utilization, resulting in low motor output. Summary of the Invention

[0005] The purpose of the present invention is to provide a two-phase eight-pole hybrid stepping motor in order to overcome the defects of the above-mentioned prior art.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to one aspect of the present invention, a two-phase eight-pole hybrid stepping motor is provided, comprising a stator punching, a two-phase winding and a rotor punching, wherein the stator punching is provided with eight stator poles distributed along the circumferential direction, and the rotor punching is provided with n rotor teeth evenly distributed along the circumference, wherein n=4×(2×k+1), k is an integer, and the step angle is θ=360° / (4×n).

[0008] As an optimal technical solution, the eight stator poles are divided into four groups, the first stator pole and the second stator pole are the first group, the third stator pole and the fourth stator pole are the second group, the fifth stator pole and the sixth stator pole are the third group, and the seventh stator pole and the eighth stator pole are the fourth group. Each pole is not grouped repeatedly, and the four groups are evenly distributed along the circumference.

[0009] As a preferred technical solution, the four groups of stator poles are divided into two phases, the first group is phase A, the second group is phase B, the third group is phase A, and the fourth group is phase B, and each phase is wound with a group of series windings.

[0010] As a preferred technical solution, the slot center line or tooth center line on each stator pole of the A phase coincides with the center line of the stator pole, wherein the slot center line is used when the number of stator teeth on the stator pole is an even number, and the tooth center line is used when the number of stator teeth on the stator pole is an odd number.

[0011] As a preferred technical solution, the slot centerline or tooth centerline on each stator pole of the B phase differs from the centerline of the stator pole by a step angle θ, wherein the slot centerline is used when the number of stator teeth on the stator pole is an even number, and the tooth centerline is used when the number of stator teeth on the stator pole is an odd number.

[0012] As a preferred technical solution, in the A-phase winding, if the winding direction on the first stator pole is positive, then the winding is reversed on the second stator pole, forward on the fifth stator pole, and reversed on the sixth stator pole.

[0013] As a preferred technical solution, in the B-phase winding, if the winding direction on the third stator pole is positive, then the winding on the fourth stator pole is reversed, the winding on the seventh stator pole is forward, and the winding on the eighth stator pole is reversed.

[0014] As a preferred technical solution, the stator punching sheets, rotor punching sheets and two-phase windings are arranged to form a step angle.

[0015] As a preferred technical solution, k is 4, n is 9, and the step angle θ is 2.5°; each stator pole is provided with four stator teeth.

[0016] As a preferred technical solution, k is 12, n is 100, and the step angle θ is 0.9°; each stator pole is provided with 11 stator teeth.

[0017] Compared with the prior art, the present invention can improve the utilization rate of space with the same number of teeth, and changes the original four tooth shapes into the current two tooth shape structure, which has a simpler structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 1 is a schematic diagram of the stator lamination structure of Example 1 of the present invention, wherein 1 is the first stator pole, 2 is the second stator pole, 3 is the third stator pole, 4 is the fourth stator pole, 5 is the fifth stator pole, 6 is the sixth stator pole, 7 is the seventh stator pole, 8 is the eighth stator pole, 9 is the stator tooth, 10 is the slot, and 11 is the stator lamination;

[0019] Figure 2 1 is a schematic diagram of the rotor punching structure of Example 1 of the present invention, wherein 12 is a rotor punching and 13 is a rotor tooth;

[0020] Figure 3 This is a schematic diagram of the winding arrangement of Example 1 of the present invention, where A+A- is phase A and B+B- is phase B;

[0021] Figure 4 Schematic diagram of the stator punching structure of the current design of Example 1, where 14 is the existing stator punching.

[0022] Figure 5 Schematic diagram of the stator punching structure of embodiment 2 of the present invention;

[0023] Figure 6 This is a schematic diagram of the stator punching structure of the current design scheme of Example 2. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0025] Example 1

[0026] like Figure 1 As shown, the present invention relates to a stator lamination 11, a rotor lamination 12, and two-phase windings A+A- and B+B-.

[0027] The stator punching 11 has eight stator poles evenly distributed along the circumference, and each stator pole has four stator teeth 9. The eight poles are divided into four groups. The first stator pole 1 and the second stator pole 2 are the first group, the third stator pole 3 and the fourth stator pole 4 are the second group, the fifth stator pole 5 and the sixth stator pole 6 are the third group, and the seventh stator pole 7 and the eighth stator pole 8 are the fourth group. The four groups are evenly distributed along the circumference.

[0028] The four groups are divided into two phases. The first group is phase A, the second group is phase B, the third group is phase A, and the fourth group is phase B. Each phase is wound with a set of windings connected in series, such as Figure 3 , A+ and A- are phase A, B+ and B- are phase B.

[0029] In the A-phase winding, if the winding direction on the first stator pole 1 is positive, then the winding direction is reversed on the second stator pole 2, forward on the fifth stator pole 5, and reverse on the sixth stator pole 6. Similarly, in the B-phase winding, if the winding direction on the third stator pole 3 is positive, then the winding direction is reversed on the fourth stator pole 4, forward on the seventh stator pole 7, and reverse on the eighth stator pole 8.

[0030] The center lines of the slots 10 on the four poles of phase A (the first stator pole 1, the second stator pole 2, the fifth stator pole 5 and the sixth stator pole 6) coincide with the center lines of the poles. The center lines of the slots 10 on the four poles of phase B (the third stator pole 3, the fourth stator pole 4, the seventh stator pole 7 and the eighth stator pole 8) differ by 2.5° from the pole center lines. Figure 1 shown.

[0031] 36 rotor teeth 13 are evenly distributed on the rotor sheet 12. The stator sheet 11, rotor sheet 12 and winding are arranged to form a step angle of 2.5°.

[0032] contrast Figure 1 and Figure 4 According to the newly invented punching structure, the existing space can be fully utilized to improve the performance of the motor. If the punching structure is designed using the existing design method, such as Figure 4 When there are four stator teeth 9 on the stator pole, the punching structure will be unreasonable, the slot for winding the power supply motor is too small, and it can only be designed as a structure with three teeth on each pole, and the space of the motor cannot be fully utilized.

[0033] contrast Figure 1 Stator punching 11 and Figure 4 The existing stator punching sheet 14, under the condition of the same number of teeth on the stator pole, the present invention changes the original four-tooth arrangement structure to the current two-tooth arrangement structure, which is simpler in structure.

[0034] In summary, the invention proposes a rotor lamination with a tooth count of n = 4 × (2 × k + 1), where k is an integer, and a step angle of θ = 360° / (4 × n). Different values ​​of k result in different n. In this case, the stator lamination can be designed with 8 poles. These 8 poles are divided into four groups, with two adjacent poles forming a group. The four groups are evenly distributed along the circumference and are divided into two phases: the first group is phase A, the second group is phase B, the third group is phase A, and the fourth group is phase B. Each phase is wound with a series winding, where the centerlines of the slots or teeth on the four poles of one phase coincide with the centerlines of the poles, while the centerlines of the slots or teeth on the four poles of the other phase differ from the centerlines of the poles by a step angle of θ. The invention proposes a design theory for a rotor with a tooth count of n = 4 × (2 × k + 1), where k is an integer. This theory can be applied to all solutions that meet the rotor tooth count requirement, not limited to designs with a step angle of 2.5°.

[0035] The hybrid stepping motor theory of the present invention expands the existing stepping motor design method and can help motor designers adjust the distribution of stator and rotor teeth according to customer needs to meet customer needs.

[0036] Example 2

[0037] At present, the number of teeth on the rotor of a 0.9° stepper motor is n=100. The motor satisfies the condition that the number of teeth on the rotor punching is n=4×(2×k+1). Taking a 42.2mm motor as an example, Figure 5 Stator punching 11 and Figure 6 Stator punching 14 comparison, Figure 5A structure with 11 teeth on the stator pole is given. The first stator pole 1 and the second stator pole 2 are the first group, the third stator pole 3 and the fourth stator pole 4 are the second group, the fifth stator pole 5 and the sixth stator pole 6 are the third group, and the seventh stator pole 7 and the eighth stator pole 8 are the fourth group. The four groups are evenly distributed along the circumference. The first group is phase A, the second group is phase B, the third group is phase A, and the fourth group is phase B. Each phase is wound with a set of series windings. The winding structure is as follows: Figure 3 , where the pole tooth center lines and pole center lines on the first stator pole 1, the second stator pole 2, the fifth stator pole 5, and the sixth stator pole 6 of phase A coincide with each other, and the tooth center lines and pole center lines on the third stator pole 3, the fourth stator pole 4, the seventh stator pole 7, and the eighth stator pole 8 of the other phase differ by a step angle of 0.9°.

[0038] For the motors with two stator structures, we make prototypes to conduct comparative tests while ensuring that other parameters are the same and only the number of small teeth on the stator poles and the phase separation of the stator poles are different. Figure 5 The stator punching 11 structure motor is better than the existing Figure 6 The holding torque of a motor with 14 stator laminations is increased by 12%. This theory can be applied to motors of other sizes with a 0.9° step angle, not limited to 42.2mm motors and motors with 11 stator teeth. Other stator pole teeth can be designed for motors with a step angle of 0.9° according to the size.

[0039] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A two-phase eight-pole hybrid stepping motor, comprising a stator lamination (11), a two-phase winding and a rotor lamination (12), characterized in that: The stator punching sheet (11) is provided with eight stator poles distributed along the circumferential direction, and the rotor punching sheet (12) is provided with n rotor teeth (13) uniformly distributed along the circumference, wherein n=4×(2×k+1), k is an integer, and the step angle is θ=360° / (4×n); The eight stator poles are divided into four groups, the first stator pole (1) and the second stator pole (2) are the first group, the third stator pole (3) and the fourth stator pole (4) are the second group, the fifth stator pole (5) and the sixth stator pole (6) are the third group, and the seventh stator pole (7) and the eighth stator pole (8) are the fourth group. Each pole is not repeatedly grouped, and the four groups are evenly distributed along the circumference. The four groups of stator poles are divided into two phases, the first group is phase A, the second group is phase B, the third group is phase A, and the fourth group is phase B. Each phase is wound with a series winding. The slot centerline or tooth centerline on each stator pole of the A phase coincides with the centerline of the stator pole, wherein the slot centerline is used when the number of stator teeth on the stator pole is even, and the tooth centerline is used when the number of stator teeth on the stator pole is odd; In the A-phase winding, if the winding direction on the first stator pole (1) is positive, the winding is reversed on the second stator pole (2), the winding is forward on the fifth stator pole (5), and the winding is reversed on the sixth stator pole (6).

2. A two-phase eight-pole hybrid stepping motor according to claim 1, characterized in that: The slot center line or tooth center line on each stator pole of the B phase differs from the center line of the stator pole by a step angle θ, wherein the slot center line is used when the number of stator teeth on the stator pole is an even number, and the tooth center line is used when the number of stator teeth on the stator pole is an odd number.

3. The two-phase eight-pole hybrid stepping motor according to claim 1, characterized in that: In the B-phase winding, if the winding direction on the third stator pole (3) is positive, the winding direction on the fourth stator pole (4) is reverse, the winding direction on the seventh stator pole (7) is positive, and the winding direction on the eighth stator pole (8) is reverse.

4. The two-phase eight-pole hybrid stepping motor according to claim 1, characterized in that: The stator punching sheets (11), the rotor punching sheets (12) and the two-phase winding are arranged to form a step angle.

5. The two-phase eight-pole hybrid stepping motor according to claim 1, characterized in that: The k is 4, n is 9, and the step angle θ is 2.5°; each stator pole is provided with four stator teeth (9).

6. The two-phase eight-pole hybrid stepping motor according to claim 1, characterized in that: The k is 12, n is 100, and the step angle θ is 0.9°; each of the stator poles is provided with 11 stator teeth (9).

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