A stator punching structure for a low-loss oil-cooled flat wire motor

Abstract

The invention discloses a stator sheet structure of a low-loss oil-cooled flat wire motor, comprising a stator sheet body, a plurality of stator teeth arranged at intervals in the circumferential direction on the stator sheet body, a stator slot arranged between two adjacent stator teeth, the stator slot adopts a parallel slot structure, tooth bosses are arranged on both sides of the stator slot, the tooth bosses are arranged in the middle of both sides of the stator slot, and the tooth bosses are arranged symmetrically about the center line of the stator slot. Bosses are added in the middle of both sides of the stator slot to increase the strength of the stator teeth, improve the stress deformation of the stator teeth, and improve the vibration noise of the motor. Oil holes are opened on the wider tooth bosses, which will not affect the fluidity of the magnetic field and the torque output of the motor, while improving the utilization rate of the stator teeth and the cooling effect of the flat wire stator, and reducing the temperature rise of the motor conductor. The design of the elliptical auxiliary slot is conducive to reducing the tooth slot torque and torque pulsation of the motor, reducing the AC loss of the flat wire conductor, and improving the efficiency of the motor.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a stator punching structure of a low-loss oil-cooled flat wire motor. Background Art

[0002] Chinese patent CN110808645A discloses a cooling structure for oil-cooled flat wire motor stator, as follows Figure 1 As shown in the patent, an oil hole is provided between the outer diameter ends of two adjacent winding slots on the stator core. The oil hole is located on the center line of the stator teeth and occupies a certain area on the stator yoke, which will affect the direction of the magnetic lines of force, weaken the fluidity of the magnetic field, affect the output of the motor torque, and reduce the torque of the motor. Summary of the invention

[0003] In view of the above-mentioned defects in the prior art, a stator punching structure of a low-loss oil-cooled flat wire motor is provided, which can not only increase the strength of the stator teeth, but also improve the stress deformation of the stator teeth and improve the vibration noise of the motor.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A stator punching sheet structure for a low-loss oil-cooled flat wire motor comprises a stator punching sheet body, a plurality of stator teeth are arranged circumferentially at intervals on the stator punching sheet body, and a stator slot is arranged between two adjacent stator teeth. The invention is characterized in that: the stator slot adopts a parallel slot structure, tooth bosses are arranged on both sides of the stator slot, the tooth bosses are arranged in the middle of both sides of the stator slot, and the tooth bosses are arranged symmetrically about the center line of the stator slot.

[0006] According to the above technical scheme, it also includes oil holes, flat wire windings and insulating paper. The oil holes are arranged close to the edge lines of the tooth bosses, and the oil holes are arranged symmetrically about the center line of the stator slots; two flat wire windings are longitudinally arranged between the tooth bosses on both sides of the stator slots, and two groups of flat wire windings of the same number are transversely arranged at both ends of the stator slots, and the longitudinally arranged flat wire windings are arranged between the transversely arranged flat wire windings; insulating paper is provided on the outside of the flat wire windings, and the flat wire windings are separated from the stator teeth by the insulating paper, and the insulating paper adopts a C-shaped structure of mutual insertion.

[0007] According to the above technical solution, the number of flat wire windings is 6, two flat wire windings are longitudinally arranged between the tooth bosses on both sides of the stator slot, and two flat wire windings are transversely arranged at both ends of the stator slot.

[0008] According to the above technical scheme, the distance H1 between the long side line of the stator tooth and the short side line of the transversely arranged flat wire winding is in the range of 0.35mm to 0.5mm; the distance between the long side line of the tooth boss and the long side line of the longitudinally arranged flat wire winding is also H1; the outer short side line of the longitudinally arranged flat wire winding falls outside the tooth boss, and the distance H2 between the outer short side line of the longitudinally arranged flat wire winding and the short side line of the tooth boss is in the range of 0.4mm to 0.8mm; the chamfer R2 between the long side line of the tooth boss and the short side line of the tooth boss, and between the short side line of the tooth boss and the long side line of the stator slot is in the range of 0.3mm to 0.5mm.

[0009] According to the above technical solution, the distance H3 between the long side line of the oil hole close to the tooth boss and the long side line of the stator slot is in the range of 0.3mm to 0.5mm; the length of the oil hole is smaller than the length of the tooth boss, and the distance H4 between the end of the oil hole and the short side line of the tooth boss is in the range of 0.3mm to 0.5mm; the distance H5 between the long sides on both sides of the oil hole is in the range of 0.4mm to 0.8mm; the end of the oil hole is semicircular, and its diameter is equal to the distance H5 between the long sides on both sides of the oil hole.

[0010] According to the above technical solution, the flat wire winding adopts a rectangular structure, the length of the flat wire winding is a, the width is b, wherein The value range is 0.5~0.7, the chamfer design is adopted at the connection between the length and width of the flat wire winding, and the value range of the chamfer R1 is 0.3mm~0.5mm; the value range of the thickness c of the insulating paper is 0.25mm~0.35mm; the length of the oil hole L1=2a+2c-2H2-2H4.

[0011] According to the above technical solution, the insulating paper openings at the flat wire windings arranged transversely at both ends are arranged opposite to each other, and the insulating paper openings at the two flat wire windings arranged longitudinally in the middle are arranged back to back.

[0012] According to the above technical solution, the height H6 of the stator slot opening is in the range of 2.4 mm to 3 mm, and the shoulder angle α1 of the stator slot is in the range of 15° to 25°.

[0013] According to the above technical solution, an elliptical auxiliary slot is provided at the stator slot opening, and the auxiliary slot is arranged symmetrically about the stator slot center line.

[0014] According to the above technical solution, the distance between the center of the elliptical auxiliary slot and the inner circle edge of the stator is H7, where The value range of is 0.55~0.60; the value range of the major axis L2 of the auxiliary slot is 2.2mm~2.6mm; the value range of the minor axis L3 of the auxiliary slot is 1.0mm~1.4mm; the chamfer design is adopted at the auxiliary slot and the stator slot, and the value range of the chamfer R3 is 0.3mm~0.5mm.

[0015] The present invention has the following beneficial effects:

[0016] 1. By arranging a tooth boss in the middle of the stator slot, the stator slot of the stator punching sheet is made into a dumbbell shape as a whole, which increases the strength of the stator teeth and improves the stress deformation of the stator teeth and the vibration noise of the motor.

[0017] 2. Opening oil holes on the wider tooth boss will not affect the fluidity of the magnetic field or the torque output of the motor. At the same time, it improves the utilization rate of the stator teeth, improves the cooling effect of the flat wire stator, and reduces the temperature rise of the motor conductor.

[0018] 3. The inserted C-shaped insulating paper does not take up too much space in the slot, and the slot fill rate of the stator can also be increased, which can increase the efficiency of the motor, reduce the temperature rise of the motor, and ensure the safety of the double-layer winding with the same slot and different phases.

[0019] 4. Opening an elliptical auxiliary slot in the stator slot is beneficial to reducing the motor's cogging torque and torque pulsation, reducing the conductor's AC loss, and improving the motor's efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the prior art;

[0021] Figure 2 It is a structural schematic diagram of an embodiment provided by the present invention;

[0022] Figure 3 It is a partial structural schematic diagram of an embodiment provided by the present invention;

[0023] Figure 4 It is a partial structural schematic diagram of a stator punching body according to an embodiment of the present invention;

[0024] Figure 5 It is a detailed view of the oil hole of the boss of the tooth part of the embodiment provided by the present invention;

[0025] Figure 6 is a diagram of placing conductors in a slot according to an embodiment of the present invention;

[0026] Figure 7 is a detailed view of the slot auxiliary groove of the embodiment provided by the present invention;

[0027] In the figure, 1. stator punching body; 2. stator teeth; 3. tooth boss; 4. oil hole; 5. flat wire winding; 6. insulating paper; 7. stator slot; 8. auxiliary slot. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0029] Reference Figure 1 to Figure 7 As shown, the present invention provides a stator sheet structure for a low-loss oil-cooled flat wire motor, including a stator sheet body 1, on which a plurality of stator teeth 2 are arranged circumferentially at intervals, and a stator slot is provided between two adjacent stator teeth. The stator slot adopts a parallel slot structure, and tooth bosses 3 are provided on both sides of the stator slot. The tooth bosses are provided in the middle of both sides of the stator slot, and the tooth bosses are arranged symmetrically about the center line of the stator slot. In this embodiment, by providing a tooth boss in the middle of the stator slot, the stator slot of the stator sheet is made into a dumbbell shape as a whole, which increases the strength of the stator teeth, improves the stress deformation of the stator teeth, and improves the vibration noise of the motor.

[0030] Furthermore, it also includes an oil hole 4, a flat wire winding 5 and an insulating paper 6. The oil hole is arranged close to the edge of the tooth boss, and the oil hole is arranged symmetrically about the center line of the stator slot; two flat wire windings are arranged longitudinally between the tooth bosses on both sides of the stator slot, and two groups of flat wire windings of the same number are arranged transversely at both ends of the stator slot, and the longitudinally arranged flat wire windings are arranged between the transversely arranged flat wire windings; insulating paper is provided on the outside of the flat wire winding, and the flat wire winding is separated from the stator teeth by the insulating paper, and the insulating paper adopts a C-shaped structure of interlocking. Opening an oil hole on a wider tooth boss will not affect the fluidity of the magnetic field, will not affect the torque output of the motor, and at the same time improve the utilization rate of the stator teeth, improve the cooling effect of the flat wire stator, and reduce the temperature rise of the motor conductor. The inserted C-shaped insulating paper does not take up too much space in the slot, and the slot fill rate of the stator can also be increased, which can increase the efficiency of the motor, reduce the temperature rise of the motor, and ensure the safety of double-layer windings with different phases in the same slot.

[0031] Furthermore, the number of the flat wire windings is 6, two flat wire windings are longitudinally arranged between the tooth bosses on both sides of the stator slot, and two flat wire windings are transversely arranged at both ends of the stator slot.

[0032] Furthermore, the distance H1 between the long side line of the stator tooth and the short side line of the transversely arranged flat wire winding is in the range of 0.35mm to 0.5mm; the distance between the long side line of the tooth boss and the long side line of the longitudinally arranged flat wire winding is also H1; the outer short side line of the longitudinally arranged flat wire winding falls outside the tooth boss, and the distance H2 between the outer short side line of the longitudinally arranged flat wire winding and the short side line of the tooth boss is in the range of 0.4mm to 0.8mm; the chamfer R2 between the long side line of the tooth boss and the short side line of the tooth boss, and between the short side line of the tooth boss and the long side line of the stator slot is in the range of 0.3mm to 0.5mm.

[0033] Furthermore, the distance H3 between the long side line of the oil hole close to the tooth boss and the long side line of the stator slot is in the range of 0.3mm to 0.5mm; the length of the oil hole is less than the length of the tooth boss, and the distance H4 between the end of the oil hole and the short side line of the tooth boss is in the range of 0.3mm to 0.5mm; the distance H5 between the long sides of the oil hole is in the range of 0.4mm to 0.8mm; the end of the oil hole is semicircular, and its diameter is equal to the distance H5 between the long sides of the oil hole.

[0034] Furthermore, the flat wire winding adopts a rectangular structure, the length of the flat wire winding is a, and the width is b, wherein The value range is 0.5~0.7, the chamfer design is adopted at the connection between the length and width of the flat wire winding, and the value range of the chamfer R1 is 0.3mm~0.5mm; the value range of the thickness c of the insulating paper is 0.25mm~0.35mm; the length of the oil hole L1=2a+2c-2H2-2H4.

[0035] Furthermore, the insulation paper openings of the flat wire windings arranged transversely at both ends are arranged opposite to each other, and the insulation paper openings of the two flat wire windings arranged longitudinally in the middle are arranged back to back.

[0036] Furthermore, the height H6 of the stator slot opening is in the range of 2.4 mm to 3 mm, and the shoulder angle α1 of the stator slot is in the range of 15° to 25°.

[0037] Furthermore, an elliptical auxiliary slot 8 is provided at the stator slot 7, and the auxiliary slot is arranged symmetrically about the stator slot center line. Providing an elliptical auxiliary slot in the stator slot is beneficial to reducing the cogging torque and torque pulsation of the motor, reducing the AC loss of the conductor, and improving the efficiency of the motor.

[0038] Furthermore, the distance between the center of the elliptical auxiliary slot and the inner circle edge of the stator is H7, where The value range of is 0.55~0.60; the value range of the major axis L2 of the auxiliary slot is 2.2mm~2.6mm; the value range of the minor axis L3 of the auxiliary slot is 1.0mm~1.4mm; the chamfer design is adopted at the auxiliary slot and the stator slot, and the value range of the chamfer R3 is 0.3mm~0.5mm.

[0039] Working principle of the present invention:

[0040] This solution increases the strength of the stator teeth by changing the slot type of the stator and the arrangement of the flat wire conductors, and adding tooth bosses in the middle of both sides of the stator slots, which can improve the stress deformation of the stator teeth and the vibration noise of the motor. In addition, oil holes are opened on the wider tooth bosses, which will not affect the fluidity of the magnetic field and the torque output of the motor, while improving the utilization rate of the stator teeth and the cooling effect of the flat wire stator, and reducing the temperature rise of the motor conductor. The opening of an elliptical auxiliary slot in the stator slot is conducive to reducing the tooth torque and torque pulsation of the motor, reducing the AC loss of the conductor, and improving the efficiency of the motor.

[0041] The above are only preferred embodiments of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the protection scope of the present invention.

Claims

1. A stator sheet structure of a low-loss oil-cooled flat wire motor, comprising a stator sheet body, a plurality of stator teeth arranged circumferentially at intervals on the stator sheet body, and a stator slot between two adjacent stator teeth. Features: The stator slot adopts a parallel slot structure, and tooth bosses are provided on both sides of the stator slot. The tooth bosses are provided in the middle of both sides of the stator slot, and the tooth bosses are arranged symmetrically about the center line of the stator slot. It also includes an oil hole, a flat wire winding and insulating paper, wherein the oil hole is arranged adjacent to the edge line of the tooth boss, and the oil hole is arranged symmetrically about the center line of the stator slot; two flat wire windings are arranged longitudinally between the tooth bosses on both sides of the stator slot, two groups of flat wire windings of the same number are arranged transversely at both ends of the stator slot, and the longitudinally arranged flat wire windings are arranged between the transversely arranged flat wire windings; insulating paper is arranged outside the flat wire winding, and the flat wire winding is separated from the stator teeth by the insulating paper, and the insulating paper adopts a C-shaped structure of interlocking; The flat wire winding adopts a rectangular structure, the length of the flat wire winding is a, the width is b, where The value range is 0.5~0.7; the length of the oil hole L 1 =2a+2c-2H 2 -2H 4 ; Among them, H 2 H is the distance between the outer short side line of the longitudinally arranged flat wire winding and the short side line of the tooth boss. 4 is the distance between the end of the oil hole and the short side line of the tooth boss, and c is the thickness of the insulating paper.

2. The stator punching structure of the low-loss oil-cooled flat wire motor according to claim 1, Features: The number of the flat wire windings is 6, two of which are longitudinally arranged between the tooth bosses on both sides of the stator slot, and two flat wire windings are transversely arranged at both ends of the stator slot.

3. The stator punching structure of the low-loss oil-cooled flat wire motor according to claim 1 or 2, Features: The distance H between the long side of the stator tooth and the short side of the transversely arranged flat wire winding 1 The value range is 0.35mm~0.5mm; the distance between the long side line of the tooth boss and the long side line of the longitudinally arranged flat wire winding is also H 1 The outer short side line of the longitudinally arranged flat wire winding falls outside the tooth boss, and the distance H between the outer short side line of the longitudinally arranged flat wire winding and the short side line of the tooth boss 2 The value range is 0.4mm~0.8mm; the chamfer R between the long side line of the tooth boss and the short side line of the tooth boss, and between the short side line of the tooth boss and the long side line of the stator slot 2 The value range is 0.3mm~0.5mm.

4. The stator punching structure of the low-loss oil-cooled flat wire motor according to claim 3, Features: The distance H between the long side line of the oil hole close to the tooth boss and the long side line of the stator slot 3 The value range is 0.3mm~0.5mm; the length of the oil hole is less than the length of the tooth boss, and the distance H between the end of the oil hole and the short side line of the tooth boss is 4 The value range is 0.3mm~0.5mm; the distance H between the long sides of the oil hole 5 The value range is 0.4mm~0.8mm; the end of the oil hole is semicircular, and the distance H between its diameter and the long side lines on both sides of the oil hole is 5 equal.

5. The stator punching structure of the low-loss oil-cooled flat wire motor according to claim 4, Features: The chamfer design is adopted at the connection between the length and width of the flat wire winding. 1 The value range of is 0.3mm~0.5mm; the value range of the thickness c of the insulating paper is 0.25mm~0.35mm.

6. The stator punching structure of the low-loss oil-cooled flat wire motor according to claim 1 or 2, Features: The insulating paper openings at the flat wire windings arranged transversely at both ends are arranged opposite to each other, and the insulating paper openings at the two flat wire windings arranged longitudinally in the middle are arranged back to back.

7. The stator punching structure of the low-loss oil-cooled flat wire motor according to claim 1, Features: Height H of stator slot 6 The value range is 2.4mm~3mm, and the slot shoulder angle α of the stator slot 1 The value range is 15°~25°.

8. The stator punching structure of the low-loss oil-cooled flat wire motor according to claim 7, Features: An elliptical auxiliary slot is provided at the stator slot opening, and the auxiliary slot is arranged symmetrically about the stator slot center line.

9. The stator punching structure of the low-loss oil-cooled flat wire motor according to claim 8, Features: The distance H between the center of the elliptical auxiliary slot and the inner edge of the stator 7 ,in The value range is 0.55~0.60; the major axis L of the auxiliary groove 2 The value range is 2.2mm~2.6mm; the minor axis L of the auxiliary groove 3 The value range is 1.0mm~1.4mm; the chamfer design between the auxiliary slot and the stator slot, where the chamfer R 3 The value range is 0.3mm~0.5mm.

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