An 18° step angle stepper motor

Abstract

The present invention relates to an 18° step angle stepper motor comprising windings, a rotor, and a stator. The rotor has five 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 for winding is formed between adjacent stator teeth in each block. Compared with existing technologies, this invention significantly reduces the restrictions imposed by the motor slot size on motor winding and increases the motor's slot fill factor.

Description

Technical Field

[0001] The present invention relates to a stepping motor, in particular to a stepping motor with a step angle of 18 degrees. Background Art

[0002] Existing 18° two-phase stepper motors such as Figure 1 、 Figure 2 、 Figure 3 As shown, 1A, 1B and 1C are the stators of Scheme 1, Scheme 2 and Scheme 3 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 5 pairs of poles.

[0003] In the existing scheme 1, the stator has four main poles: A-phase main poles A1 and A2, and B-phase main poles B1 and B2. Each main pole has a stator tooth, for a total of four stator teeth: TA1, TA2, TB1, and TB2. The eight main poles are arranged in the counterclockwise order of A1, B1, A2, and B2, with an angle of 90° between them.

[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 counterclockwise order of A1, A2, A3, A4, B1, B2, B3, B4, with angles between them of 36°, 36°, 36°, 54°, 36°, 36°, 36°, and 90°, respectively.

[0005] In the existing scheme three, the stator has eight 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 eight stator teeth: TA1, TA2, TA3, TA4, and TB1, TB2, TB3, TB4. The eight main poles are arranged counterclockwise in the order A1, A2, B1, B2, A3, A4, B3, B4, with angles of 36°, 54°, 36°, 54°, 36°, 54°, 36°, and 54°, respectively.

[0006] The existing solutions 1, 2, and 3 have the following disadvantages:

[0007] The scheme has fewer stator teeth, lower motor magnetic field utilization, and smaller motor output torque.

[0008] In options 1, 2, and 3, when the stator outer diameter is less than 20 mm, the slot opening of the motor will be very small, making motor winding difficult; 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

[0009] The purpose of the present invention is to provide a stepping motor with an 18° step angle in order to overcome the defects of the prior art.

[0010] The purpose of the present invention can be achieved by the following technical solutions:

[0011] A stepper motor with an 18° step angle comprises a winding, a rotor and a stator. The rotor is provided with five 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.

[0012] Preferably, the outer diameter of the stator yoke is smaller than the outer diameter of the stator.

[0013] Preferably, the angle between adjacent stator blocks is 36°, 54° or 90°, 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.

[0014] 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 36°.

[0015] 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 36°, 54°, 36° and 90°, respectively. Stator block 11 and stator block 12 belong to phase A, and stator block 13 and stator block 14 belong to phase B.

[0016] Preferably, in a counterclockwise direction, the stator teeth on the stator block 11 are TA1 and TA2, the stator teeth on the stator block 12 are TA3 and TA4, the stator teeth on the stator block 13 are TB1 and TB2, and the stator teeth on the stator block 14 are TB3 and TB4.

[0017] 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 corresponding thicknesses are LA1, LA2, LB1, and LB2, respectively, where LA1=LA2=LB1=LB2.

[0018] Preferably, the stator yokes YA1 and YA2 are extended in the approaching direction to connect the stator blocks 11 and 12, thereby obtaining the stator block 112 and the stator yoke YA12. Meanwhile, the stator yokes YB1 and YB2 are extended in the approaching direction to connect the stator blocks 13 and 14, thereby obtaining the stator block 123 and the stator yoke YB12;

[0019] where 0.5*LA1 < LA12 = LB12 < 1.5*LA1, where LA12 is the thickness of the stator yoke YA'12 and LB12 is the thickness of the stator yoke YB12.

[0020] Preferably, in the counterclockwise direction, the four stator blocks are the stator block 21, the stator block 22, the stator block 23, and the stator block 24 in sequence, and the included angles between the stator blocks are all 54°. Among them, the stator block 21 and the stator block 23 belong to phase A, and the stator block 22 and the stator block 24 belong to phase B.

[0021] Preferably, in the counterclockwise direction, the stator teeth on the stator block 21 are TA1 and TA2 in sequence, the stator teeth on the stator block 23 are TA3 and TA4 in sequence, the stator teeth on the stator block 22 are TB1 and TB2 in sequence, and the stator teeth on the stator block 24 are TB3 and TB4 in sequence;

[0022] The 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 corresponding thicknesses are LA1, LA2, LB1, and LB2 respectively, where LA1 = LA2 = LB1 = LB2.

[0023] Preferably, the stator yokes YA1 and YB1 are extended in the approaching direction to connect the stator blocks 21 and 22, thereby obtaining the stator block 212 and the stator yoke YAB1. Meanwhile, the stator yokes YA2 and YB2 are extended in the approaching direction to connect the stator blocks 23 and 24, thereby obtaining the stator block 223 and the stator yoke YAB2;

[0024] where 0.5*LA1 < LAB1 = LAB2 < 1.5*LA1, where LAB1 is the thickness of the stator yoke YAB1 and LAB2 is the thickness of the stator yoke YAB2.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] (1) The iron core segmentation and yoke winding technology of the present invention will greatly reduce the limitation of the motor slot opening size on the motor winding. At the same time, since the winding is on the motor yoke, the space for the inlet and outlet of the winding nozzle will be in the radial direction, without occupying the area inside the motor slot, which is more conducive to improving the utilization rate of the motor slot area.

[0027] (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

[0028] Figure 1 This is a structural diagram of the existing scheme 1;

[0029] Figure 2 This is a structural diagram of the existing scheme 2;

[0030] Figure 3 This is a structural diagram of the existing scheme three;

[0031] Figure 4 This is a schematic structural diagram of Example 1;

[0032] Figure 5 This is a schematic structural diagram of Example 2;

[0033] Figure 6 This is a schematic structural diagram of Example 3;

[0034] Figure 7 This is a structural diagram of Example 4. DETAILED DESCRIPTION

[0035] 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.

[0036] 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:

[0037] 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.

[0038] The 8° step angle stepper motor of the present invention comprises windings, a rotor, and a stator. The rotor has five pairs of poles, and the stator is a split-type structure comprising an even number of stator blocks of identical shape. Each stator block has at least two stator teeth. A stator yoke for winding is formed between adjacent stator teeth in each stator block. The outer diameter of the stator yoke is smaller than the outer diameter of the stator.

[0039] Example 1

[0040] like Figure 4As shown, the overall stator is divided into four stator blocks: stator block 11, stator block 12, stator block 13, and stator block 14. The four stator blocks are identical. Among them, stator blocks 11 and 12 belong to phase A, and stator blocks 13 and 14 belong to phase B. Each stator block has two stator teeth, and the included angle between the two stator teeth is 36°.

[0041] In the counterclockwise direction, the stator blocks are successively stator block 11, stator block 12, stator block 13, and stator block 14, and the included angles between the stator blocks are successively 36°, 54°, 36°, and 90°.

[0042] The stator teeth on stator block 11 are successively TA1 and TA2, the stator teeth on stator block 12 are successively TA3 and TA4, the stator teeth on stator block 13 are successively TB1 and TB2, and the stator teeth on stator block 14 are successively TB3 and TB4.

[0043] Between the stator teeth TA1 and TA2, TA3 and TA4, TB1 and TB2, and TB3 and TB4, stator yokes YA1, YA2, YB1, and YB2 are successively formed. The outer diameter of the stator yoke is smaller than the outer diameter of the stator, and the shape of the stator block is an H shape with one end wide and the other end narrow.

[0044] In this embodiment, the thicknesses of the stator yokes YA1, YA2, YB1, and YB2 are respectively LA1, LA2, LB1, and LB2, where LA1 = LA2 = LB1 = LB2.

[0045] Embodiment 2 <00​​​​​​​​​​​​​​​​In the counterclockwise direction, the stator blocks are stator block 21, stator block 22, stator block 23, and stator block 24 in sequence, and the included angles between the stator blocks are all 54°.

[0051] The stator teeth on stator block 21 are TA1 and TA2 in sequence, the stator teeth on stator block 22 are TB1 and TB2 in sequence, the stator teeth on stator block 23 are TA3 and TA4 in sequence, and the stator teeth on stator block 24 are TB3 and TB4 in sequence.

[0052] The 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. The outer diameter of the yoke is smaller than the outer diameter of the stator, and the shape of the stator block is an H shape with one end wide and the other end narrow.

[0053] In this embodiment, the thicknesses of the stator yokes YA1, YA2, YB1, and YB2 are LA1, LA2, LB1, and LB2 respectively, where LA1 = LA2 = LB1 = LB2.

[0054] Embodiment 4

[0055] As Figure 7 shown, in Embodiment 4, the stator yokes YA1 and YB1 of Embodiment 3 are extended in the approaching direction to connect stator block 21 and stator block 22, obtaining stator block 212 and stator yoke YAB1. At the same time, the stator yokes YA2 and YB2 are extended in the approaching direction to connect stator block 23 and stator block 24, obtaining stator block 223 and stator yoke YAB2;

[0056] where 0.5 * LA < LAB1 = LAB2 < 1.5 * LA1, where LAB1 is the thickness of the stator yoke YAB1, and LAB2 is the thickness of the stator yoke YAB2.

[0057] In all the above embodiments during winding, the winding nozzle winds up and down around the yoke from the slot opening, and the movement direction of the nozzle is the radial direction, which is different from the circumferential direction when winding on the teeth. When the nozzle winds in the radial direction, it does not occupy the space of the motor slot, which is beneficial to improving the slot fill factor of the motor.

[0058] At the same time, this structure of the stator block greatly improves the winding and production efficiency of the motor.

[0059] As described above, only the specific embodiments of the present invention are provided, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A stepping motor with an 18° step angle, comprising a winding, a rotor and a stator, wherein the rotor has five pairs of poles and is characterized in that: The stator is of a split structure, which includes an even number of stator blocks with the same shape. Each stator block is provided with at least two stator teeth, and a stator yoke for winding is formed between adjacent stator teeth in each stator block; The outer diameter of the stator yoke is smaller than the outer diameter of the stator; There are four stator blocks, and each stator block is provided with two stator teeth, and the included angle between the two stator teeth is 36°; During winding, the winding nozzle winds up and down around the yoke from the slot opening, and the moving direction of the nozzle is the radial direction; 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) in sequence, and the included angles between the stator blocks are 36°, 54°, 36°, 90° in sequence. Among them, the first stator block (11) and the second stator block (12) belong to phase A, and the third stator block (13) and the fourth stator block (14) belong to phase B.

2. The 18° step angle stepping motor according to claim 1, characterized in that: The stator block has a structure with one wide end and one narrow end, and the stator teeth are arranged at the narrow end.

3. The 18° step angle stepper motor according to claim 1, characterized in that: In the counterclockwise direction, the stator teeth on the first stator block (11) are TA1 and TA2 in sequence, the stator teeth on the second stator block (12) are TA3 and TA4 in sequence, the stator teeth on the third stator block (13) 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, YB2 are formed between the stator teeth TA1 and TA2, TA3 and TA4, TB1 and TB2, TB3 and TB4 in sequence, and their corresponding thicknesses are LA1, LA2, LB1, LB2 respectively, where LA1 = LA2 = LB1 = LB2.

4. The 18° step angle stepping motor according to claim 3, characterized in that: The stator yokes YA1 and YA2 extend in the approaching direction to connect the first stator block (11) and the second stator block (12), obtaining the ninth stator block (112) and the stator yoke YA12. At the same time, the stator yokes YB1 and YB2 extend in the approaching direction to connect the third stator block (13) and the fourth stator block (14), obtaining the tenth stator block (123) and the stator yoke YB12; Among them, 0.5*LA1 < LA12 = LB12 < 1.5*LA1, where LA12 is the thickness of the stator yoke YA12, and LB12 is the thickness of the stator yoke YB12.

5. A stepping motor with an 18° step angle, comprising a winding, a rotor and a stator, wherein the rotor has five pairs of poles and is characterized in that: The stator is of a split structure, which includes an even number of stator blocks with the same shape. Each stator block is provided with at least two stator teeth, and a stator yoke for winding is formed between adjacent stator teeth in each stator block; The outer diameter of the stator yoke is smaller than the outer diameter of the stator; There are four stator blocks, and each stator block is provided with two stator teeth, and the included angle between the two stator teeth is 36°; During winding, the winding nozzle winds up and down around the yoke from the slot opening, and the moving direction of the nozzle is the radial direction; In the counterclockwise direction, the four stator blocks are the fifth stator block (21), the sixth stator block (22), the seventh stator block (23), and the eighth stator block (24) in sequence. The included angles between the stator blocks are all 54°. Among them, the fifth stator block (21) and the seventh stator block (23) belong to phase A, and the sixth stator block (22) and the eighth stator block (24) belong to phase B.

6. The 18° step angle stepping motor according to claim 5, characterized in that: In the counterclockwise direction, the stator teeth on the fifth stator block (21) are TA1 and TA2 in sequence, the stator teeth on the seventh stator block (23) are TA3 and TA4 in sequence, the stator teeth on the sixth stator block (22) are TB1 and TB2 in sequence, and the stator teeth on the eighth stator block (24) are TB3 and TB4 in sequence; The stator teeth TA1 and TA2, TA3 and TA4, TB1 and TB2, and TB3 and TB4 form stator yokes YA1, YA2, YB1, and YB2 in sequence. Their corresponding thicknesses are LA1, LA2, LB1, and LB2 respectively, where LA1 = LA2 = LB1 = LB2.

7. The 18° step angle stepping motor according to claim 6, characterized in that: The stator yokes YA1 and YB1 extend in the approaching direction to connect the fifth stator block (21) and the sixth stator block (22), obtaining the eleventh stator block (212) and the stator yoke YAB1. At the same time, the stator yokes YA2 and YB2 extend in the approaching direction to connect the seventh stator block (23) and the eighth stator block (24), obtaining the twelfth stator block (223) and the stator yoke YAB2; Among them, 0.5 * LA1 < LAB1 = LAB2 < 1.5 * LA1, where LAB1 is the thickness of the stator yoke YAB1, and LAB2 is the thickness of the stator yoke YAB2.

Images