A stepping motor stator and a stepping motor having the same

Abstract

The application relates to a stepping motor stator and a stepping motor with the same, wherein the stepping motor stator comprises a stator core, the stator core comprises eight stator main poles A1, A2, B1, B2, A3, A4, B3 and B4, wherein the stator main poles A1, A3, B1 and B3 are positive, the stator main poles A2, A4, B2 and B4 are negative, the included angles between the center lines of the stator small teeth under each stator main pole are 45.0 DEG, 45.9 DEG, 45.0 DEG, 44.1 DEG, 45.0 DEG, 45.9 DEG, 45.0 DEG and 44.1 DEG in sequence, and the included angles respectively correspond to A1, A2, A2, B1, B1, B2, B2, A3, A3, A4, A4, B3, B3, B4 and A1. Compared with the prior art, the application has the advantages of reduced magnetic resistance of the motor, increased motor torque and reduced motor loss.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of step motor, especially to a kind of step motor stator and the step motor with the stator of the step motor. BACKGROUND

[0002] The existing step angle is 0.9 ° two-phase hybrid step motor, and the stator core structure is as follows Figure 1

[0003] In the existing stator core design scheme, the existing stator core 1 is designed as 8 main poles, and each main pole is provided with a plurality of stator small teeth 2.

[0004] Among them, A-phase main poles are A1, A2, A3 and A4 respectively; B-phase main poles are B1, B2, B3 and B4 respectively.

[0005] A1, A3, B1 and B3 are positive (+); A2, A4, B2 and B4 are negative (-).

[0006] In order to meet the operation rule of 0.9 ° step motor, the relative angle of the center line of the stator small teeth under each main pole is shown in Table 1:

[0007] Table 1

[0008]

[0009] In order to keep the slot area of the motor consistent, the included angle between 8 adjacent main poles is 45 °.

[0010] Under this design, the center line of main poles A1 and A3 coincides with the center line of the stator small teeth under the main poles; the center line of the remaining main poles does not coincide with the center line of the stator small teeth under the main poles. The pole shoe part of each stator main pole is appropriately extended to ensure that the slot width of the motor is B and the slot width is symmetrical about the center line of the slot.

[0011] Under this design idea, the motor stator core cannot be rotated, which affects the accuracy of the motor. At the same time, the number of stator teeth of each main pole of the motor is set to 10 at most, and the torque of the motor is low. SUMMARY

[0012] The purpose of the present application is to overcome the defects of the prior art and provide a step motor stator and a step motor with the stator.

[0013] The purpose of the present application can be achieved by the following technical solutions:

[0014] ​According to one aspect of the present application, there is provided a stepper motor stator, comprising a stator core, the stator core comprising eight stator main poles A1, A2, B1, B2, A3, A4, B3 and B4, wherein the stator main poles A1, A3, B1 and B3 are positive, the stator main poles A2, A4, B2 and B4 are negative, and the included angles between the center lines of the stator teeth under each of the stator main poles are 45.0°, 45.9°, 45.0°, 44.1°, 45.0°, 45.9°, 45.0° and 44.1° in sequence, corresponding to A1, A2, A2, B1, B1, B2, B2, A3, A3, A4, A4, B3, B3, B4 and A1 respectively.

[0015] As a preferred technical solution, the stator teeth under each of the stator main poles are symmetrically distributed about the center line of the stator main pole.

[0016] As a preferred technical solution, the included angle between adjacent stator main poles is 45°, and the stator slot areas defined between adjacent stator main poles are the same.

[0017] As a preferred technical solution, the minimum slot opening width defined between adjacent stator main poles is b0, which is distributed between the stator main poles A1 and B4 and the stator main poles A3 and B2, and the angle defined by the center lines of the stator teeth under the stator main poles is the smallest, which is 44.1°.

[0018] As a preferred technical solution, the positions of the stator main poles are fixed, and the relative positions of the stator teeth under each of the stator main poles are fixed, and each of the stator teeth is rotated clockwise by 0.45°.

[0019] As a preferred technical solution, the center line positions of the slots defined by the stator main poles B2 and A3 and the stator main poles A1 and B4 are consistent with the center line positions of the slot opening widths b0 defined by the stator teeth under the stator main poles.

[0020] As a preferred technical solution, the stator main poles extend in the circumferential direction to stator main pole shoes, so that the stator slot opening widths b1 defined by each adjacent stator tooth under the stator main poles are the same.

[0021] As a preferred technical solution, the center lines of the stator slots defined by each adjacent stator main pole coincide with the center lines of the stator slot openings defined by each adjacent stator tooth under the stator main poles.

[0022] As a preferred technical solution, the outer frame of the stator core is circular or square, and if it is square, screw hole positions are additionally provided.

[0023] According to another aspect of the present application, there is provided a stepper motor with a stator, comprising the stepper motor stator.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] 1) Short magnetic circuit design, the motor's magnetic resistance is reduced, the motor's torque is increased, and the motor's loss is reduced;

[0026] 2) The stator can be rotated by 180°, eliminating the difference in the thickness of the stator core laminations, and reducing the difficulty of motor manufacturing;

[0027] 3) When the motor stator adopts 11 stator small teeth per main pole design (in the drawings, only 9 stator small teeth are shown for clarity, and more than 9 are not shown in the drawings), the output torque of the motor is increased while ensuring the available slot opening width of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the structure of the existing stator core;

[0029] Figure 2 is a schematic diagram of the structure of the stator core of Example 1;

[0030] Figure 3 is a schematic diagram of the structure of the stator core of Example 2;

[0031] Figure 4 is a schematic diagram of the structure of the stator core of Example 3;

[0032] Figure 5 is a schematic diagram of the structure of the stator core of Example 4;

[0033] Figure 6 is a schematic diagram of the structure of the stator core of Example 5;

[0034] wherein 1 is the existing stator core, 2 is the stator small tooth, 3 is the stator pole shoe extension, 4 is the first stator core of Example 1, 5 is the second stator core of Example 2, 6 is the third stator core of Example 3, 7 is the stator main pole shoe extension, 8 is the fourth stator core of Example 4, and 9 is the fifth stator core of Example 5. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor should fall within the scope of protection of the present application.

[0036] Example 1

[0037] In Example 1, as follows Figure 2In the first stator core 4 shown, the stator small teeth under each stator main pole are symmetrically distributed about the center line of the stator main pole;

[0038] The distribution of the 8 stator main poles is A1, A2, B1, B2, A3, A4, B3, B4;

[0039] The polarities of A1, A3, B1, and B3 are positive (+);

[0040] The polarities of A2, A4, B2, and B4 are negative (-);

[0041] In order to meet the operation rules of a 0.9° stepping motor, the relative angles of the center lines of the stator small teeth under each main pole are shown in Table 2:

[0042] Table 2

[0043]

[0044] In such a design, the included angle between every 4 adjacent stator main poles is 180°, and the stator core can achieve a 180° rotation, improving the precision of the motor. However, there is still a problem that the areas of the stator slots defined by adjacent stator main poles are inconsistent, resulting in different winding slot fill rates of the motor and smaller motor output.

[0045] Example 2

[0046] In Example 2, as shown below Figure 3 In the second stator core 5 shown, on the basis of Example 1, the positions of the stator small teeth under the fixed main poles are adjusted, taking the A2 stator main pole as a reference, and the included angle between adjacent main poles is 45°

[0047] 1) The areas of the stator slots defined by adjacent stator main poles are the same

[0048] 2) The minimum slot opening width b0 between adjacent main poles of the motor appears between the main poles A1 and B4 and A3 and B2, and the angle defined by the center lines of the stator small teeth under the main poles is the smallest, being 44.1°.

[0049] 3) The center line position of the slot is the center position of the winding nozzle entering and exiting the slot, and when the center line of the slot and the center line of the slot opening are inconsistent, it will result in reduced winding efficiency of the motor.

[0050] Example 3

[0051] In Example 3, as shown below Figure 4 In the third stator core 6 shown,

[0052] On the basis of Example 2, the positions of the stator main poles are fixed, the relative positions of the stator small teeth under each stator main pole are fixed, and each stator small tooth is rotated clockwise by 0.45°.

[0053] 1) The stator slot area defined between adjacent stator main poles is the same

[0054] 2) The minimum slot opening width b0 defined between adjacent main poles, which occurs between main poles A1 and B4 and A3 and B2, is the smallest, and the angle defined by the center line of the stator tooth under the main pole is 44.1°.

[0055] 3) The center line position of the slot defined by main poles B2 and A3 and main poles A1 and B4 is consistent with the slot opening width b0 center line position defined by the stator tooth under the main pole.

[0056] The relative angle position of the stator main pole and the center line of the stator tooth under the main pole in the design scheme is as follows:

[0057] The relative positions of the other main poles are shown in Table 3:

[0058] Table 3

[0059]

[0060] The relative positions of the other main poles are shown in Table 4:

[0061] Table 4

[0062]

[0063] Example 4

[0064] In Example 4, as shown in the fourth stator core 8, Figure 5 based on Example 3, the stator main pole shoe is appropriately extended in the circumferential direction;

[0065] 1) Ensure that the stator slot opening width defined by each adjacent stator tooth under the main pole is the same, b1;

[0066] 2) Ensure that the center line of the stator slot defined by each adjacent main pole coincides with the center line of the stator slot opening defined by each adjacent stator tooth under the main pole.

[0067] Example 5

[0068] In Example 5, as shown in the stator core 9, Figure 6 based on Examples 1-4, the motor core frame is adjusted to be square, and the screw hole position is increased.

[0069] Example 6

[0070] The present embodiment also provides a stepping motor with a stator, comprising the stepping motor stator of any one of Examples 1-5.

[0071] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A stepper motor stator comprising a stator core comprising eight stator main poles Al, A2, Bl, B2, A3, A4, B3 and B4, wherein the stator main poles Al, A3, Bl, B3 have a positive polarity and the stator main poles A2, A4, B2, B4 have a negative polarity, characterized in that ； The included angles between the center lines of the stator small teeth under each of the stator main poles are 45.0°, 45.9°, 45.0°, 44.1°, 45.0°, 45.9°, 45.0° and 44.1° in turn, respectively corresponding to A1, A2, A2, B1, B1, B2, B2, A3, A3, A4, A4, B3, B3, B4 and B4, A1; The positions of the stator main poles are fixed, and the relative positions of the stator small teeth under each of the stator main poles are fixed, and each of the stator small teeth is rotated clockwise by 0.45°; the stator main poles are extended in the circumferential direction by the stator main pole shoes, so that the stator slot opening widths b1 defined by each adjacent stator main pole and the stator small teeth thereunder are the same.

2. A stepper motor stator according to claim 1, wherein The stator small teeth under each of the stator main poles are symmetrically distributed about the center line of the stator main pole.

3. A stepper motor stator as claimed in claim 1, wherein The included angle between adjacent stator main poles is 45°, and the stator slot areas defined between adjacent stator main poles are the same.

4. A stepper motor stator according to claim 3, wherein The minimum slot opening width b0 defined between adjacent stator main poles is distributed between the stator main poles A1 and B4 and the stator main poles A3 and B2, and the angle defined by the center lines of the stator small teeth thereunder is the smallest, which is 44.1°.

5. A stepper motor stator as claimed in claim 1, wherein, The center line positions of the slots defined by the stator main poles B2 and A3 and the stator main poles A1 and B4 are consistent with the center line positions of the slot opening widths b0 defined by the stator small teeth thereunder.

6. A stepper motor stator as claimed in claim 1, wherein, The center line of the stator slot defined by each adjacent stator main pole coincides with the center line of the stator slot opening defined by each adjacent stator small tooth under the stator main pole.

7. A stepper motor stator as claimed in claim 1, wherein The outer frame of the stator core is circular or square, and if it is square, screw hole positions are additionally provided.

8. A stepper motor having a stator, characterized by The stepping motor stator comprises the stator according to any one of claims 1-7. The stepping motor stator comprises the stator according to any one of claims 1-7.

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