A 15° step angle stepper motor

Abstract

The present invention relates to a 15° step angle stepper motor comprising windings, a rotor, and a stator. The rotor has six pairs of poles, and the stator is a split-type structure comprising an even number of identically shaped stator blocks. Each block has at least two stator teeth, and a stator yoke is formed between adjacent stator teeth in each block for winding. Compared with existing technologies, this invention facilitates modular winding production of motors and improves motor production efficiency.

Description

Technical Field

[0001] The present invention relates to a stepping motor, in particular to a stepping motor with a step angle of 15 degrees. Background Art

[0002] Existing 15° two-phase stepper motors such as Figure 1 、 Figure 2 As shown, 1A and 1B are the stators of Scheme 1 and Scheme 2 respectively, and 2 is the rotor of the existing scheme. The rotor can be made of stacked stamping sheets or a permanent magnet rotor, but both have alternating N and S poles, with a total of 6 pairs of poles.

[0003] In the existing scheme 1, the stator has 8 main poles: A-phase main poles A1, A2, A3, A4 and B-phase main poles B1, B2, B3, B4. Each main pole has a stator tooth, for a total of 8 stator teeth: TA1, TA2, TA3, TA4 and TB1, TB2, TB3, TB4. The 8 main poles are arranged in the order of A1, B1, A2, B2, A3, B3, A4, B4 in a counterclockwise direction, and the angle between them is 45 degrees.

[0004] In the existing scheme 2, the stator has 8 main poles: A-phase main poles A1, A2, A3, A4, and B-phase main poles B1, B2, B3, B4. Each main pole has a stator tooth, for a total of 8 stator teeth: TA1, TA2, TA3, TA4, and TB1, TB2, TB3, TB4. The 8 main poles are arranged in the following counterclockwise order: A1, A2, B1, B2, A3, A4, B3, B4, with angles of 30°, 45°, 30°, 75°, 30°, 45°, 30°, and 75°, respectively.

[0005] The existing solutions 1 and 2 have the following disadvantages:

[0006] When the stator outer diameter is less than 20mm, the slot of the motor will be very small, which will cause difficulties in winding the motor. At the same time, because the winding is wound on the main pole of the motor, the space for the winding nozzle to enter and exit the slot will occupy the area inside the slot, affecting the motor slot fill rate and further affecting the output torque of the motor. Summary of the Invention

[0007] The purpose of the present invention is to provide a 15° step angle stepping motor in order to overcome the defects of the above-mentioned prior art.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] A 15° step angle stepper motor comprises a winding, a rotor and a stator. The rotor is provided with six pairs of poles. The stator is a split structure comprising an even number of stator blocks of identical shape. Each stator block is provided with at least two stator teeth. A stator yoke for winding is formed between adjacent stator teeth in each stator block.

[0010] Preferably, the outer diameter of the stator yoke is smaller than the outer diameter of the stator.

[0011] Preferably, the angle between adjacent stator blocks is 15°, 45° or 75°, the stator block is a structure with one end being wide and the other end being narrow, and the stator teeth are provided at the narrow end.

[0012] Preferably, there are four stator blocks, and each stator block is provided with two stator teeth, and the angle between the two stator teeth is 30°.

[0013] Preferably, in a counterclockwise direction, the four stator blocks are stator block 11, stator block 12, stator block 13 and stator block 14, and the angles between the stator blocks are 45°, 75°, 45° and 75°, respectively. Stator block 11 and stator block 13 belong to phase A, and stator block 12 and stator block 14 belong to phase B.

[0014] Preferably, in a counterclockwise direction, the stator teeth on the stator block 11 are TA1 and TA2, the stator teeth on the stator block 13 are TA3 and TA4, the stator teeth on the stator block 12 are TB1 and TB2, and the stator teeth on the stator block 14 are TB3 and TB4.

[0015] Stator yokes YA1, YA2, YB1 and YB2 are formed between the stator teeth TA1 and TA2, TA3 and TA4, TB1 and TB2, and TB3 and TB4 in sequence, and their thicknesses are LA1, LA2, LB1 and LB2 respectively, where LA1=LA2=LB1=LB2;

[0016] When winding, the winding nozzle winds up and down around the stator yoke from the slot, and the movement direction of the winding nozzle is the radial direction.

[0017] Preferably, there are two stator blocks, namely stator block 21 and stator block 22, wherein the stator block 21 is A-phase and the stator block 22 is B-phase. Each stator block has four stator teeth, and the angles between the two ends of the two stator blocks are 15° and 45°.

[0018] Preferably, in the counterclockwise direction, the stator teeth on the A-phase stator block 21 are TA1, TA2, TA3 and TA4 in sequence, and the angles between the four stator teeth are 60°, 30° and 60° in sequence.

[0019] Preferably, in the counterclockwise direction, the stator teeth on the B-phase stator block 22 are TB1, TB2, TB3 and TB4 in sequence, and the angles between the four stator teeth are 60°, 30° and 60° in sequence.

[0020] Preferably, stator yokes YA1, YA2, YA3, YB1, YB2, and YB3 are formed between the stator teeth TA1 and TA2, TA3 and TA4, TA2 and TA3, TB1 and TB2, TB3 and TB4, and TB2 and TB3, and their corresponding thicknesses are LA1, LA2, LA3, LB1, LB2, and LB3, respectively, where LA1=LA2=LB1=LB2, 1.0*LA1 <LA3=LB3<3.0*LA1。

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] (1) The core splitting and yoke winding technology of the present invention will greatly reduce the limitation of the motor slot size on the motor winding; at the same time, since the winding is done on the motor yoke, the entry and exit space of the winding nozzle will be in the radial direction, and will not occupy the area inside the motor slot, which is more conducive to improving the utilization rate of the motor slot area.

[0023] (2) The core splitting technology of the present invention is conducive to realizing modular winding production of motors and improving the production efficiency of motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of the existing scheme 1;

[0025] Figure 2 This is a structural diagram of the existing scheme 2;

[0026] Figure 3 This is a schematic structural diagram of Example 1;

[0027] Figure 4 This is a structural diagram of Example 2. DETAILED DESCRIPTION

[0028] 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.

[0029] In order to reduce the difficulty of motor winding and improve the motor slot fill rate, and reduce the difficulty of manufacturing small motors, the present invention adopts the following measures:

[0030] The split core technology is used to greatly reduce the limitation of the motor slot size on the motor winding. At the same time, the motor winding is wound on the motor yoke, and the winding nozzle does not occupy the motor slot area, which increases the motor slot fill rate.

[0031] The 15° step angle stepper motor of the present invention includes a winding, a rotor and a stator. The rotor is provided with 6 pairs of poles. The stator is a split structure, which includes an even number of stator blocks of the same shape. Each stator block is distributed with at least two stator teeth. A stator yoke portion for winding is formed between adjacent stator teeth in each stator block.

[0032] Example 1

[0033] like Figure 3 As shown, the entire stator is divided into four blocks, namely stator block 11, stator block 12, stator block 13 and stator block 14. The four stators are identical, wherein stator block 11 and stator block 13 belong to phase A, and stator block 12 and stator block 14 belong to phase B. Each stator block has two stator teeth, and the angle between the two stator teeth is 30°.

[0034] In a counterclockwise direction, the stator blocks are stator block 11, stator block 12, stator block 13 and stator block 14, and the angles between the stator blocks are 45°, 75°, 45° and 75° respectively.

[0035] The stator teeth on the stator block 11 are sequentially TA1 and TA2, the stator teeth on the stator block 13 are sequentially TA3 and TA4, the stator teeth on the stator block 12 are sequentially TB1 and TB2, and the stator teeth on the stator block 14 are sequentially TB3 and TB4.

[0036] A stator yoke YA1, YA2, YB1, YB2 is defined between two stator teeth of each stator block. The outer diameter of the yoke is smaller than the outer diameter of the stator. The shape of the stator block is H-shaped with one end wide and the other end narrow.

[0037] In the embodiment, the thicknesses of the stator yokes YA1 , YA2 , YB1 , and YB2 are LA1 , LA2 , LB1 , and LB2 , respectively, where LA1 = LA2 = LB1 = LB2 .

[0038] During winding, the winding nozzle moves up and down around the yoke from the slot opening. The nozzle's movement is radial, unlike the circumferential direction of winding around the teeth. This radial winding direction eliminates the need for slot space, improving the motor's slot fill rate. Furthermore, this stator block structure significantly improves the motor's winding efficiency.

[0039] Example 2

[0040] like Figure 4As shown, the entire stator is divided into two blocks, a stator block 21 and a stator block 22. The two stator blocks are identical, wherein the stator block 21 is for phase A and the stator block 22 is for phase B. Each stator block has four stator teeth, and the angles between the two ends of the two stator blocks are 15° and 45°.

[0041] In the counterclockwise direction, the stator teeth on the A-phase stator block 21 are TA1, TA2, TA3 and TA4, and the angles between the four stator teeth are 60°, 30° and 60°, respectively.

[0042] In the counterclockwise direction, the stator teeth on the B-phase stator block 22 are TB1, TB2, TB3 and TB4, and the angles between the four stator teeth are 60°, 30° and 60°, respectively.

[0043] Compared with embodiment 1, embodiment 2 adds new yokes YA3 and YB3, which means that new winding space is added, such as Figure 4 As shown, it is beneficial to improve the output torque of the motor.

[0044] In Example 2, the thicknesses of the stator yokes YA1, YA2, YA3, YB1, YB2, and YB3 are LA1, LA2, LA3, LB1, LB2, and LB3, respectively, where LA1=LA2=LB1=LB2, and 1.0*LA1 <LA3=LB3<3.0*LA1。

[0045] 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 15° step angle stepping motor, comprising a winding, a rotor and a stator, wherein the rotor has 6 pairs of poles, characterized in that: The stator is a split structure, which includes an even number of stator blocks of the same shape, each of which is provided with at least two stator teeth, and a stator yoke for winding is formed between adjacent stator teeth in each stator block; There are four stator blocks, and each stator block is provided with two stator teeth, and the angle between the two stator teeth is 30 degrees; In the counterclockwise direction, the four stator blocks are the first stator block (11), the second stator block (12), the third stator block (13) and the fourth stator block (14), and the angles between the stator blocks are 45°, 75°, 45° and 75°, respectively. The first stator block (11) and the third stator block (13) belong to the A phase, and the second stator block (12) and the fourth stator block (14) belong to the B phase. In a counterclockwise direction, the stator teeth on the first stator block (11) are TA1 and TA2 in sequence, the stator teeth on the third stator block (13) are TA3 and TA4 in sequence, the stator teeth on the second stator block (12) are TB1 and TB2 in sequence, and the stator teeth on the fourth stator block (14) are TB3 and TB4 in sequence; Stator yokes YA1, YA2, YB1 and YB2 are formed between the stator teeth TA1 and TA2, TA3 and TA4, TB1 and TB2, and TB3 and TB4 in sequence, and their thicknesses are LA1, LA2, LB1 and LB2 respectively, where LA1=LA2=LB1=LB2; When winding, the winding nozzle winds up and down around the stator yoke from the slot, and the movement direction of the winding nozzle is the radial direction.

2. A 15° step angle stepping motor according to claim 1, characterized in that: The outer diameter of the stator yoke is smaller than the outer diameter of the stator.

3. A 15° step angle stepping motor, comprising a winding, a rotor and a stator, wherein the rotor has 6 pairs of poles, characterized in that: The stator is a split structure, which includes an even number of stator blocks of the same shape, each of which is provided with at least two stator teeth, and a stator yoke for winding is formed between adjacent stator teeth in each stator block; There are two stator blocks, namely a fifth stator block (21) and a sixth stator block (22), wherein the fifth stator block (21) is an A phase and the sixth stator block (22) is a B phase. Each stator block has four stator teeth, and the angles between the two ends of the two stator blocks are 15° and 45°. In the counterclockwise direction, the stator teeth on the fifth stator block (21) of phase A are TA1, TA2, TA3 and TA4, and the angles between the four stator teeth are 60°, 30° and 60° respectively; In the counterclockwise direction, the stator teeth on the sixth stator block (22) of the B phase are TB1, TB2, TB3 and TB4, and the angles between the four stator teeth are 60°, 30° and 60° respectively; Stator yokes YA1, YA2, YA3, YB1, YB2, and YB3 are formed between the stator teeth TA1 and TA2, TA3 and TA4, TA2 and TA3, TB1 and TB2, TB3 and TB4, and TB2 and TB3, and their corresponding thicknesses are LA1, LA2, LA3, LB1, LB2, and LB3, respectively, where LA1=LA2=LB1=LB2, 1.0*LA1 <LA3=LB3<3.0*LA1。

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