A hybrid stepping motor

Abstract

The present invention relates to a hybrid stepping motor comprising a stator lamination, a rotor lamination, and a two-phase winding. The stator lamination includes eight stator poles distributed along the circumference, and the rotor lamination is provided with n rotor teeth evenly distributed along the circumference, where n = 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 improving the utilization of motor space.

Description

Technical Field

[0001] The present invention relates to a motor, in particular to a 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] Currently, conventional stepper motors with a step angle of 1.2° are all three-phase. While these motors offer higher positioning accuracy than two-phase 1.8° stepper motors, they have a significant drawback: when they are operating, only two phases of the winding are energized, which reduces the motor's torque. This means that while three-phase motors offer improved positioning accuracy, they also reduce space utilization. Summary of the Invention

[0004] The purpose of the present invention is to provide a hybrid stepping motor in order to overcome the above-mentioned defects in the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] According to one aspect of the present invention, a hybrid stepping motor is provided, comprising a stator punching, a rotor punching and a two-phase winding, wherein the stator punching comprises eight stator poles distributed along the circumference, and the rotor punching is provided with n rotor teeth uniformly distributed along the circumference, wherein n=2×k+1, k is an integer, and the step angle is θ=360° / (4×n).

[0007] The eight stator pole packages 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.

[0008] As an optimal 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.

[0009] As a preferred technical solution, the slot centerline or tooth centerline on one stator pole in each group coincides with the stator pole centerline, and the slot centerline or tooth centerline of the other stator pole differs from the stator pole centerline by θ / 2; 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.

[0010] As a preferred technical solution, the front-to-back arrangement order of the two types of stator poles in the four groups is consistent.

[0011] 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, reversed on the fifth stator pole, and forward on the sixth stator pole.

[0012] 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, and if the winding on the seventh stator pole is reversed, then the winding on the eighth stator pole is forward.

[0013] As a preferred technical solution, the stator punching sheets, rotor punching sheets and two-phase windings are arranged to form a step angle.

[0014] As a preferred technical solution, k is 37, n is 75, and the step angle θ is 1.2°.

[0015] As a preferred technical solution, each of the stator poles is provided with 8 stator teeth.

[0016] Compared with the prior art, the present invention changes the three-phase winding structure into a two-phase winding structure with the same step angle, thereby improving the utilization of the motor space; at the same time, a new motor solution can be obtained by adjusting the motor structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the stator punching structure 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 punching;

[0018] Figure 2 Schematic diagram of the rotor punching structure of the present invention, wherein 12 is the rotor teeth and 13 is the rotor punching;

[0019] Figure 3 This is a schematic diagram of the winding arrangement of the patented invention, where A+A- is phase A and B+B- is phase B;

[0020] Figure 4 Schematic diagram of the stator punching structure of the current design, where 14 is the existing stator punching. DETAILED DESCRIPTION

[0021] 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.

[0022] like Figure 1 As shown, the present invention relates to a stator punching 11, a rotor punching 13, and two-phase windings A and B.

[0023] The stator punching 11 has eight stator poles evenly distributed along the circumference, and each stator pole has eight stator teeth 9. These 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.

[0024] In each group, the center line of the slot 10 on one pole coincides with the pole center line, and the center line of the slot 10 on the other pole differs from the pole center line by 0.6°. Figure 1 The pole center lines and slot center lines of the first stator pole 1 in the first group, the third stator pole 3 in the second group, the fifth stator pole 5 in the third group and the seventh stator pole 7 in the fourth group coincide with each other, and the slot center lines of the second stator pole 2 in the first group, the fourth stator pole 4 in the second group, the sixth stator pole 6 in the third group and the eighth stator pole 8 in the fourth group are offset from the pole center line by 0.6°.

[0025] 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 4 , A+A- is phase A, and B+B- is phase B.

[0026] 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, reversed on the fifth stator pole 5, and forward 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, reversed on the seventh stator pole 7, and forward on the eighth stator pole 8.

[0027] 75 rotor teeth 12 are evenly distributed on the rotor sheet 13. The stator sheet 11, rotor sheet 13 and winding are arranged to form a step angle of 1.2°.

[0028] contrast Figure 1 and Figure 4 , Figure 4 It can be seen that the existing stator punching 14 has nine poles to ensure an equal number of poles per phase. Because the magnetic circuit of the stator punching is asymmetrical when the outline is square, the nine poles of the three-phase 1.2° stepper motor need to be manufactured into a circular structure. The two-phase 1.2° stepper motor is not restricted by the external structure and can be manufactured into either the current circular shape or the conventional square outline. The square outline can be selected for the process of convenient processing.

[0029] When the motor is running, only two phases of the three-phase 1.2° stepper motor are energized at each moment, and three of the nine poles are not energized, so the space of the motor cannot be fully utilized. According to the structure of the stator punching sheet 11, the existing space can be fully utilized to improve the performance of the motor.

[0030] In summary, the number of teeth on the rotor punching of this invention is n=2×k+1, where k is an integer, and the step angle is θ=360° / (4×n). When k takes different values, different n is obtained. At this time, the stator punching can be designed as 8 poles, and the number of teeth on each pole can be determined according to the size of the step angle, the size of the space, and the needs of process processing. These 8 poles are divided into four groups, with two adjacent poles forming a group. The four groups are evenly distributed along the circumference. 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. A group of series windings is wound on each phase. In each group, the center line of the slot or tooth on one pole coincides with the center line of the pole, and the center line of the slot or tooth on the other pole differs from the center line of the pole by half a step angle θ / 2. The front and back order of the two pole shapes in each group is not unique, but the front and back arrangement order of the two pole shapes in the four groups is consistent. When and Figure 1 When the order is the same, the slot centerline of one pole in each group is offset clockwise by the pole centerline by θ / 2. Figure 1 When the order is reversed, the slot centerline of one pole in each group is offset counterclockwise from the pole centerline by θ / 2.

[0031] The invention proposes a design theory where the number of rotor teeth is n = 2 × k + 1, where k is an integer. This theory can be applied to all solutions that meet the rotor tooth number requirement, not limited to designs with a step angle of 1.2°.

[0032] 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.

[0033] 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 hybrid stepping motor comprising a stator lamination (11), a rotor lamination (13) and a two-phase winding, characterized in that: The stator punching sheet includes eight stator poles distributed along the circumference, and the rotor punching sheet (13) is provided with n rotor teeth (12) evenly distributed along the circumference, wherein n=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, and each phase is wound with a series winding; In each group, the slot centerline or tooth centerline on one stator pole coincides with the stator pole centerline, and the slot centerline or tooth centerline on the other stator pole differs from the stator pole centerline by θ / 2; 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), reversed on the fifth stator pole (5), and forward on the sixth stator pole (6); in the B-phase winding, if the winding direction on the third stator pole (3) is positive, the winding is reversed on the fourth stator pole (4), reversed on the seventh stator pole (7), and forward on the eighth stator pole (8).

2. A hybrid stepping motor according to claim 1, characterized in that: The front-to-back arrangement order of the two types of stator poles in the four groups is consistent.

3. The 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.

4. The hybrid stepping motor according to claim 1, characterized in that: The k is 37, n is 75, and the step angle θ is 1.2°.

5. The hybrid stepping motor according to claim 1, characterized in that: Each of the stator poles is provided with 8 stator teeth (9).

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