Stator core for winding round wire winding, stator, drive motor, and automobile

Abstract

The application relates to a stator core for winding a round wire winding, a stator, a driving motor and an automobile, which comprises a stator yoke, a stator tooth arranged on the inner side of the stator yoke and a tooth shoe arranged on the tooth top of the stator tooth, and a stator slot is formed among the stator yoke, the stator tooth and the tooth shoe; the tooth width of the stator tooth gradually decreases from the tooth root to the tooth top, the slot top width of the stator slot is sw, the tooth top width of the stator tooth is tw, and sw / tw=0.6-0.8. Compared with the prior art, the tooth width of the stator tooth gradually decreases from the tooth root to the tooth top, and the ratio of the slot top width of the stator slot to the tooth top width of the stator tooth is 0.6-0.8, so that the slot top magnetic leakage of the stator slot during winding of the round wire winding of the stator core is reduced, and the tooth top magnetic saturation degree of the stator tooth during winding of the round wire winding of the stator core is improved, thereby being favorable for improving the peak torque and the peak power of the driving motor.

Description

Technical Field

[0001] This invention belongs to the field of stator technology, and in particular relates to a stator core for winding round wire, a stator, a drive motor, and an automobile. Background Technology

[0002] The stator teeth and slots of existing drive motor stator cores are mostly either parallel teeth or parallel slots. With parallel teeth, the tooth width is fixed; with parallel slots, the slot width is fixed. Generally, flat wire windings use parallel slots more often, while round wire windings use parallel teeth more often.

[0003] In the parallel tooth scheme, the top slot width of the stator slot (referred to as the top slot width, which refers to the slot width of the stator slot near the air gap side) is much smaller than the bottom slot width (i.e., the slot width of the stator slot near the stator yoke side). Therefore, the leakage flux at the top of the stator slot is large, resulting in the rotor magnetic field and the stator magnetic field not being fully linked, and the motor performance not being fully utilized. Under the constraint that the total area of ​​the stator slot remains unchanged, it is difficult to improve the peak torque and peak power. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a stator core for winding round wire, a stator, a drive motor and an automobile, which are all designed to address the difficulty in improving the peak torque and peak power of existing products.

[0005] To solve the above-mentioned technical problems, the present invention provides a stator core for winding round wire, including a stator yoke, stator teeth disposed inside the stator yoke, and tooth shoes disposed at the tooth tips of the stator teeth, wherein a stator slot is formed by the stator yoke, the stator teeth, and the tooth shoes.

[0006] The width of the stator teeth gradually decreases from the tooth root to the tooth tip, the top width of the stator slot is sw, and the top width of the stator teeth is tw, where sw / tw = 0.6 to 0.8.

[0007] Optionally, sw / tw = 0.65 to 0.75.

[0008] Optionally, the stator slot includes an arc-shaped slot section and a variable-width slot section;

[0009] The arc-shaped groove segment is formed by the inner periphery of the stator yoke and the side portion of the tooth root of the stator tooth;

[0010] The widened slot section is formed by the side of the stator tooth and the tooth shoe, and is connected to the arc-shaped slot section;

[0011] The width of the variable-width groove gradually decreases from the bottom to the top of the groove.

[0012] Optionally, the number of stator slots is 48.

[0013] Optionally, the stator yoke is annular in shape and has an outer diameter of 150-250 mm.

[0014] Optionally, the cross-section of the outer periphery of the stator yoke is polygonal, and the diameter of the inscribed circle of the cross-section of the outer periphery of the stator yoke is 150-250 mm.

[0015] On the other hand, the present invention also provides a stator, including a round wire winding and the aforementioned stator core for winding the round wire winding, wherein the round wire winding is embedded in the stator slot.

[0016] On the other hand, the present invention also provides a drive motor, including the aforementioned stator.

[0017] On the other hand, the present invention also provides an automobile including the aforementioned drive motor.

[0018] The stator core, stator, drive motor, and automobile provided in this invention embodiment, compared with the prior art, feature a stator tooth width that gradually decreases from the tooth root to the tooth tip, and a ratio of the stator slot tip width to the stator tooth tip width of 0.6 to 0.8. This reduces slot tip leakage flux and increases the tip magnetic saturation of the stator teeth when the stator core is wound with round wire, while keeping the total area of ​​the stator slot constant. This is beneficial for improving the peak torque and peak power of the drive motor using this stator core. By adjusting the stator tooth width and sw / tw, the peak torque and peak power output are maximized without increasing material usage or volume envelope. The drive motor performance is significantly improved compared to common parallel tooth or parallel slot solutions, which helps save costs. Attached Figure Description

[0019] Figure 1 This is a partial structural schematic diagram of a stator core for winding round wire according to an embodiment of the present invention;

[0020] Figure 2 This is a peak torque curve diagram of the stator core for winding round wire provided in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram comparing the peak power percentage of a stator core for a wound round wire winding provided in an embodiment of the present invention with that of an existing parallel tooth stator core and a parallel slot stator core.

[0022] The reference numerals in the accompanying drawings are as follows:

[0023] 1. Stator yoke; 2. Stator teeth; 3. Tooth shoe; 4. Stator slot; 41. Arc-shaped slot section; 42. Variable width slot section. Detailed Implementation

[0024] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0025] like Figure 1 As shown, the stator core for winding round wire provided in this embodiment of the invention includes a stator yoke 1, stator teeth 2 disposed inside the stator yoke 1, and tooth shoes 3 disposed at the tooth tips of the stator teeth 2. A stator slot 4 is formed by the stator yoke 1, stator teeth 2, and tooth shoes 3 enclosing each other. The tooth width of the stator teeth 2 gradually decreases from the tooth root to the tooth tip. The slot tip width of the stator slot 4 is sw, and the tooth tip width of the stator teeth 2 is tw, where sw / tw = 0.6~0.8. Figure 1 Only 1 / 8 of the stator core structure along the circumferential direction is shown.

[0026] Figure 2 The value indicated by A is the same as the peak torque when the stator core of the drive motor uses parallel teeth, and the value indicated by B is the same as the peak torque when the stator core of the drive motor uses parallel slots. It can be seen that when sw / tw is 0.6 to 0.8, the peak torque of the drive motor is significantly better than that of the traditional parallel tooth or parallel slot scheme. Figure 3 When sw / tw is 0.6 to 0.8, the peak power of the drive motor is higher than 100.6%, which meets the peak power requirements of electric vehicles for drive motors. This is significantly better than the scheme using parallel teeth and close to the scheme using parallel slots. In summary, compared with the traditional scheme of using parallel teeth to wind round wires on the stator core, this application improves both the peak torque and peak power of the drive motor.

[0027] The stator core for winding round wire provided in this invention, compared with the prior art, features a stator tooth 2 with a tooth width that gradually decreases from the tooth root to the tooth tip, and a ratio of the slot tip width of the stator slot 4 to the tooth tip width of the stator tooth 2 is 0.6 to 0.8. This reduces the slot tip leakage flux of the stator slot 4 when winding round wire, and increases the tooth tip magnetic saturation of the stator tooth 2 when winding round wire, while keeping the total area of ​​the stator slot 4 constant. This is beneficial for improving the peak torque and peak power of the drive motor using this stator core. By adjusting the tooth width and sw / tw of the stator tooth 2, the peak torque and peak power output are maximized without increasing material usage or volume envelope. The performance of the drive motor is significantly improved compared with common parallel tooth or parallel slot solutions, which is beneficial for cost savings.

[0028] Preferably, sw / tw = 0.65–0.75. From Figure 2 It can be seen that when sw / tw is 0.65 to 0.75, the peak torque of the drive motor is significantly improved.

[0029] In one embodiment, such as Figure 1 As shown, the stator slot 4 includes an arc-shaped slot section 41 and a widened slot section 42;

[0030] The arc-shaped groove segment 41 is formed by the inner periphery of the stator yoke 1 and the side of the tooth root of the stator tooth 2;

[0031] The widened slot section 42 is formed by the side of the stator tooth 2 and the tooth shoe 3, and is connected to the arc-shaped slot section 41;

[0032] The width of the variable-width groove 42 gradually decreases from the bottom to the top of the groove.

[0033] The arc-shaped slot section 41 is designed to facilitate the contact between the round wire winding at the bottom of the slot and the stator yoke 1. The design of the widened slot section 42 makes the width of both the widened slot section 42 and the stator tooth 2 gradually decrease in the direction away from the stator yoke 1, which is beneficial to improving the peak torque. This makes the peak torque better than both the parallel tooth scheme and the parallel slot scheme.

[0034] In one embodiment, the number of stator slots 4 is 48. Drive motors often use stator cores with 48 slots. It has been verified that when the number of stator slots 4 is 48, the tooth width of stator teeth 2 gradually decreases from the tooth root to the tooth tip, and when sw / tw = 0.6 to 0.8, the peak torque and peak power of the drive motor are significantly improved.

[0035] In one embodiment, such as Figure 1 As shown, the stator yoke 1 is annular in shape with an outer diameter of 150-250mm. Drive motors often use stator cores with annular stator yoke 1 and an outer diameter of 150-250mm. Verification has shown that when the stator yoke 1 is annular with an outer diameter of 150-250mm, and the tooth width of the stator teeth 2 gradually decreases from the tooth root to the tooth tip, and sw / tw = 0.6–0.8, the peak torque and peak power of the drive motor are significantly improved.

[0036] Specifically, such as Figure 1 As shown, all stator teeth 2 are arranged in a circular array, so that the stator teeth 2 are the same size and shape, and the stator slots 4 are the same size and shape.

[0037] In one embodiment, the cross-section of the stator yoke's outer periphery is polygonal, and the diameter of the inscribed circle of the cross-section of the stator yoke's outer periphery is 150-250 mm. Drive motors also commonly use stator cores with a polygonal cross-section of the stator yoke's outer periphery and a diameter of the inscribed circle of the cross-section of the stator yoke's outer periphery of 150-250 mm. Verification has shown that for this type of stator core, the tooth width of the stator teeth gradually decreases from the tooth root to the tooth tip. When sw / tw = 0.6 to 0.8, the peak torque and peak power of the drive motor are significantly improved.

[0038] On the other hand, the present invention also provides a stator, including a round wire winding and the aforementioned stator core for winding the round wire winding, wherein the round wire winding is embedded in the stator slot 4.

[0039] On the other hand, the present invention also provides a drive motor, including the aforementioned stator.

[0040] On the other hand, the present invention also provides an automobile including the aforementioned drive motor.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stator core for winding round wire, used to drive a motor, the stator core comprising a stator yoke, stator teeth disposed inside the stator yoke, and tooth shoes disposed at the tooth tips of the stator teeth, wherein a stator slot is formed by the stator yoke, the stator teeth, and the tooth shoes; characterized in that, The width of the stator tooth gradually decreases from the tooth root to the tooth tip. The stator slot includes an arc-shaped slot section and a variable-width slot section. The arc-shaped slot section is formed by the inner circumference of the stator yoke and the side of the tooth root of the stator tooth. The variable-width slot section is formed by the side of the stator tooth and the tooth shoe and is connected to the arc-shaped slot section. The width of the variable-width slot section gradually decreases from the bottom of the slot to the top of the slot. The top width of the stator slot is sw, and the top width of the stator tooth is tw, where sw / tw = 0.65 to 0.

75.

2. The stator core for winding round wire according to claim 1, characterized in that, The number of stator slots is 48.

3. The stator core for winding round wire according to claim 1, characterized in that, The stator yoke is annular in shape and has an outer diameter of 150-250 mm.

4. The stator core for winding round wire according to claim 1, characterized in that, The cross-section of the outer periphery of the stator yoke is polygonal, and the diameter of the inscribed circle of the cross-section of the outer periphery of the stator yoke is 150-250mm.

5. A stator comprising round wire windings, characterized in that, The stator core for winding a round wire as described in any one of claims 1-4, wherein the round wire winding is embedded in the stator slot.

6. A drive motor, characterized in that, Includes the stator as described in claim 5.

7. A car, characterized in that, Includes the drive motor as described in claim 6.

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