A new type of unequal area flat wire winding permanent magnet motor

Abstract

A novel flat wire winding permanent magnet motor with unequal area belongs to the technical field of AC motor. The invention is to solve the problem that the AC loss of the flat wire motor stator winding is too high under high-frequency working conditions, and there are problems such as card jumper and easy damage to the insulating paint film during welding during the manufacturing process. It includes: the stator core includes a stator yoke and a stator tooth part, and the gap between the stator yoke and the stator tooth part constitutes a stator core slot. The first type: the stator winding includes two large-area flat wire windings and two double-strand flat wire windings, and the large-area flat wire windings and the double-strand flat wire windings are both placed in the stator core slot; the stator core slot is rectangular; the large-area flat wire windings are connected in series, and the double-strand flat wire windings are connected in parallel; the other type: the stator winding includes a plurality of trapezoidal flat wire windings, the stator core slot is trapezoidal, the slot bottom is the long side, and the trapezoidal flat wire winding is placed in the stator core slot, and the side of the trapezoidal flat wire winding close to the slot bottom of the stator core slot is the long side. The present invention is used for flat wire winding permanent magnet motors, and is particularly suitable for motors used in new energy vehicles.

Description

Technical Field

[0001] The invention relates to a novel flat wire winding permanent magnet motor with unequal areas, belonging to the technical field of AC motors. Background Art

[0002] As new energy vehicles continue to develop towards miniaturization and high efficiency, flat wire winding motors have become the mainstream of automotive permanent magnet motors in recent years due to their high slot fill rate, good heat dissipation characteristics, and high power density. Compared with traditional round wire motors, the slot fill rate of flat wire winding motors can be increased from 45% of round wire windings to about 75%. Therefore, the DC resistance of the winding can be reduced, while the magnetic field strength and power density can be increased.

[0003] The operating speed and frequency of motors used in new energy vehicles are generally high. Since the flat wire winding has a large cross-sectional area, the skin effect and proximity effect of the winding are more obvious under high-frequency operation, resulting in large AC losses. Therefore, suppressing AC losses has become the main direction for optimizing the efficiency of flat wire motors.

[0004] The existing flat wire motor stator winding has the following problems during the manufacturing process:

[0005] 1. Card jumpers with different pitches;

[0006] 2. The three-phase outgoing wires of the winding and the neutral point are placed on the welding side, which will increase the end height of the welding point and the difficulty of welding. There is a greater risk of damaging the insulating paint film of the flat wire during welding, thereby reducing the reliability of the flat wire motor.

[0007] Therefore, according to the process method of motor manufacturing, it is essential to improve the end connection of the motor winding. Summary of the invention

[0008] The purpose of the present invention is to solve the problems of excessively high AC loss of flat wire motor stator windings under high-frequency working conditions, the existence of card jumpers in the manufacturing process and easy damage to the insulating paint film during welding, and provide a new type of unequal-area flat wire winding permanent magnet motor.

[0009] The present invention discloses a novel flat wire winding permanent magnet motor with unequal area, wherein the stator core comprises a stator yoke and a stator tooth, and the gaps between the plurality of stator teeth constitute stator core slots;

[0010] The stator winding includes two large-area flat wire windings and two double-strand flat wire windings, and the large-area flat wire windings and the double-strand flat wire windings are both placed in the stator core slots;

[0011] The stator core slots are rectangular;

[0012] Two large-area flat wire windings are connected in series, and two double-strand flat wire windings are connected in parallel;

[0013] The thickness of the large-area flat wire winding is greater than the thickness of the two-strand flat wire winding.

[0014] Preferably, the area of ​​the large-area flat wire winding is larger than the area of ​​the two-strand flat wire winding.

[0015] Another novel flat wire winding permanent magnet motor with unequal area described in the present invention, the stator core includes a stator yoke part and a stator tooth part, and the gaps between the plurality of stator core slots constitute the stator core slots;

[0016] The stator winding includes a plurality of trapezoidal flat wire windings.

[0017] The stator core slots are trapezoidal, with the slot bottom being the long side. The trapezoidal flat wire windings are all placed in the stator core slots, and the side of the trapezoidal flat wire windings close to the slot bottom of the stator core slot is the long side.

[0018] Preferably, it also includes an insulation structure, and the junction structure includes slot insulation and winding insulation;

[0019] The slot insulation is placed inside the stator core slot;

[0020] The winding insulation is placed between adjacent windings of the stator winding.

[0021] Preferably, the stator winding includes a U-phase winding, a V-phase winding and a W-phase winding;

[0022] Each branch includes stator windings in stator core slots at relative positions of each pole pair connected in series, so as to distribute stator winding units in different stator core slots to each branch;

[0023] The conductors of the parallel branches connect all the conductor layers in sequence to balance the resistance and potential of each branch.

[0024] Preferably, the end connections of the stator windings of different branches are as follows:

[0025] The hairpin ends of all stator windings are arranged on the same side, and the welding ends are arranged on the other side;

[0026] The winding method of the first branch is: the winding is lap-wound M times between the first stator core slot and the Lth stator core slot with the corresponding pitch, and the winding order is that the current flows into the stator winding in the Lth stator core slot through the welding end, and then returns from the hairpin end of the Lth stator core slot to the hairpin end of the first stator core slot, and finally flows out from the hairpin end of the Lth stator core slot after M lap-wound times;

[0027] The M is one half of the number of series turns per phase;

[0028] Complete the winding of all branches in sequence in the above manner.

[0029] Advantages of the invention: The invention proposes two new types of flat-wire winding permanent magnet motors with unequal areas, which have the advantages of high hairpin winding slot fullness, high power density, high torque density, and low DC copper loss. It can also greatly reduce the AC loss on the flat-wire winding caused by skin effect and proximity effect, and improve the motor efficiency. When new energy vehicles use flat-wire winding motors, the efficiency at high speed is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a novel flat wire winding permanent magnet motor with unequal areas according to a specific embodiment of the present invention;

[0031] Figure 2 It is a structural schematic diagram of another novel flat wire winding permanent magnet motor with unequal areas according to the second specific implementation mode of the present invention;

[0032] Figure 3 It is an expanded diagram of an 8-pole, 48-slot, four-layer flat wire winding. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0036] Embodiment 1:

[0037] Combine the following Figure 1 This embodiment is described. This embodiment describes a novel flat wire winding permanent magnet motor with unequal areas. The stator core 1 includes a stator yoke 2 and a stator tooth 3. The gaps between the plurality of stator teeth 3 constitute stator core slots.

[0038] The stator winding includes two large-area flat wire windings 4 and two double-strand flat wire windings 5, and the large-area flat wire windings 4 and the double-strand flat wire windings 5 ​​are both placed in the stator core slots;

[0039] The stator core slots are rectangular;

[0040] Two large-area flat wire windings 4 are connected in series, and two double-strand flat wire windings 5 ​​are connected in parallel;

[0041] The thickness of the large-area flat wire winding 4 is greater than the thickness of the two-strand flat wire winding 5 .

[0042] Furthermore, the area of ​​the large-area flat wire winding 4 is larger than the area of ​​the two-strand flat wire winding 5 .

[0043] In this embodiment, the area of ​​the large-area rectangular wire winding 4 is slightly larger than the area of ​​the two-strand rectangular wire winding 5 .

[0044] In this embodiment, there are 4 layers of flat wire windings in the slot along the radial direction of the motor, wherein the double-strand flat wire winding 5 near the slot mouth adopts a flat wire winding with two strands, and the 2-layer trapezoidal flat wire winding 6 at the bottom of the slot adopts a whole flat wire winding with a relatively large area. The total width of the double-strand flat wire winding 5 is the same as the width of the large-area flat wire winding 4, but the thickness of the two is different. The thickness of the divided flat wire winding is smaller, that is, relatively thinner.

[0045] Embodiment 2:

[0046] Combine the following Figure 2 This embodiment is described. In this embodiment, another novel flat wire winding permanent magnet motor with unequal area is described. The stator core 1 includes a stator yoke 2 and a stator tooth 3. The gaps between the plurality of stator teeth 3 constitute stator core slots.

[0047] The stator winding includes a plurality of trapezoidal flat wire windings 6,

[0048] The stator core slots are trapezoidal, with the slot bottom being the long side. The trapezoidal flat wire windings 6 are all placed in the stator core slots, and the side of the trapezoidal flat wire windings 6 close to the slot bottom of the stator core slot is the long side.

[0049] In the present embodiment, a flat wire motor winding is divided into branches according to the number of slots per pole per phase. Through appropriate connection methods, the phase difference caused by different slots in different parallel branches in the same phase is reduced. In some embodiments, the resistance of each branch of the winding is equal, and the potential of different parallel branches in the same phase has a high balance. In this way, all jumpers and output terminals are located at the hairpin terminal 8, and the welding terminal 7 only has solder joints but no jumpers and output terminals.

[0050] Furthermore, the novel flat wire winding permanent magnet motor with unequal area proposed in Example 1 and Example 2 further includes an insulation structure, and the insulation structure includes slot insulation and winding insulation;

[0051] The slot insulation is placed inside the stator core slot;

[0052] The winding insulation is placed between adjacent windings of the stator winding.

[0053] Furthermore, the stator winding includes a U-phase winding, a V-phase winding and a W-phase winding;

[0054] Each branch includes stator windings in stator core slots at relative positions of each pole pair connected in series, so as to distribute stator winding units in different stator core slots to each branch;

[0055] The conductors of the parallel branches connect all the conductor layers in sequence to balance the resistance and potential of each branch.

[0056] In this embodiment, the coils in the slots at different relative positions in the winding of this phase are connected in the same way for other branches and other phases. Each branch winding is formed by connecting the winding units of the slots at different relative positions under each pole pair in series. Each branch can use flat wires with equal line type and line length to achieve balanced winding resistance. The lengths of each branch winding can be made roughly equal to improve the uniformity of the resistance of multiple branch windings. By connecting the coils at different positions under each pole in series, the phase difference of the potential cancels each other out, improving the balance of the potential. In this way, the generation of circulating currents between branch windings is greatly reduced, thereby suppressing the heating of the windings.

[0057] Furthermore, the end connection mode of the stator windings of different branches is:

[0058] The hairpin ends 8 of all stator windings are arranged on the same side, and the welding ends 7 are arranged on the other side;

[0059] The winding method of the first branch is: the winding is lap-wound M times between the first stator core slot and the Lth stator core slot with the corresponding pitch, and the winding order is that the current flows into the stator winding in the Lth stator core slot through the welding end 7, and then returns from the hairpin end 8 of the Lth stator core slot to the hairpin end 8 of the first stator core slot, and finally flows out from the hairpin end 8 of the Lth stator core slot after M lap-wound times;

[0060] The M is one half of the number of series turns per phase;

[0061] Complete the winding of all branches in sequence in the above manner.

[0062] In this embodiment, the stator winding formed by the end connection of the stator windings of the above-mentioned different branches has all jumpers and outlets located at the hairpin end 8, and only welding points but no jumpers and outlets exist at the welding end 7. This will reduce the difficulty of welding and reduce the end height of the welding end and the hairpin end.

[0063] like Figure 3 As shown, the stator core 1 includes 8 poles and 48 stator core slots arranged at intervals on a circumference, the number of conductors arranged in each stator core slot is 8 layers, and the 48 stator core slots are arranged at equal intervals on the circumference. The 48 stator core slots are numbered from 1 to 48, and the 4 flat wires are numbered from the outer diameter to the inner diameter in the order of a, b, c, d.

[0064] The winding method of the first branch of the U-phase winding structure is: insert into the d layer of the No. 1 stator core slot of the hairpin end stator, then cross into the c layer of the No. 7 stator core slot through the welding end, then cross into the d layer of the No. 13 stator core slot through the hairpin end, then cross into the c layer of the No. 19 stator core slot through the welding end, then cross into the d layer of the No. 25 stator core slot through the hairpin end, then cross into the c layer of the No. 31 stator core slot through the welding end, then cross into the d layer of the No. 37 stator core slot through the hairpin end, and then cross into the No. 43 stator core slot through the welding end. The c layer of the stator core slot, then crosses into the b layer of the stator core slot No. 2 through the hairpin end, and then crosses into the a layer of the stator core slot No. 8 through the welding end, and then crosses into the b layer of the stator core slot No. 14 through the hairpin end, and then crosses into the a layer of the stator core slot No. 20 through the welding end, and then crosses into the b layer of the stator core slot No. 26 through the hairpin end, and then crosses into the a layer of the stator core slot No. 32 through the welding end, and then crosses into the b layer of the stator core slot No. 38 through the hairpin end, and then crosses into the a layer of the stator core slot No. 44 through the welding end, and then the wiring is led out from the hairpin end.

[0065] The winding method of the second branch of the U-phase winding structure is: insert into the d layer of the No. 2 stator core slot of the hairpin end stator, then cross into the c layer of the No. 8 stator core slot through the welding end, then cross into the d layer of the No. 14 stator core slot through the hairpin end, then cross into the c layer of the No. 20 stator core slot through the welding end, then cross into the d layer of the No. 26 stator core slot through the hairpin end, then cross into the c layer of the No. 32 stator core slot through the welding end, then cross into the d layer of the No. 38 stator core slot through the hairpin end, and then cross into the 44 stator core slot through the welding end. The c layer of the stator core slot, then crosses into the b layer of the stator core slot No. 1 through the hairpin end, and then crosses into the a layer of the stator core slot No. 7 through the welding end, and then crosses into the b layer of the stator core slot No. 13 through the hairpin end, and then crosses into the a layer of the stator core slot No. 19 through the welding end, and then crosses into the b layer of the stator core slot No. 25 through the hairpin end, and then crosses into the a layer of the stator core slot No. 31 through the welding end, and then crosses into the b layer of the stator core slot No. 37 through the hairpin end, and then crosses into the a layer of the stator core slot No. 43 through the welding end, and then the wiring is led out from the hairpin end.

[0066] The winding method of the third branch of the U-phase winding structure is as follows: insert into the a layer of the stator core slot No. 1 of the hairpin end stator, then cross into the b layer of the stator core slot No. 43 through the welding end, then cross into the a layer of the stator core slot No. 37 through the hairpin end, then cross into the b layer of the stator core slot No. 31 through the welding end, then cross into the a layer of the stator core slot No. 25 through the hairpin end, then cross into the b layer of the stator core slot No. 19 through the welding end, then cross into the a layer of the stator core slot No. 13 through the hairpin end, and then cross into the stator core slot No. 7 through the welding end. The b layer of the stator core slot, then crosses into the c layer of the stator core slot No. 2 through the hairpin end, and then crosses into the d layer of the stator core slot No. 44 through the welding end, and then crosses into the c layer of the stator core slot No. 38 through the hairpin end, and then crosses into the d layer of the stator core slot No. 32 through the welding end, and then crosses into the c layer of the stator core slot No. 26 through the hairpin end, and then crosses into the d layer of the stator core slot No. 20 through the welding end, and then crosses into the c layer of the stator core slot No. 14 through the hairpin end, and then crosses into the d layer of the stator core slot No. 8 through the welding end, and then the wiring is led out from the hairpin end.

[0067] The winding method of the fourth branch of the U-phase winding structure is: insert into the a layer of the stator core slot No. 2 of the hairpin end stator, then cross into the b layer of the stator core slot No. 44 through the welding end, then cross into the a layer of the stator core slot No. 38 through the hairpin end, then cross into the b layer of the stator core slot No. 32 through the welding end, then cross into the a layer of the stator core slot No. 26 through the hairpin end, then cross into the b layer of the stator core slot No. 20 through the welding end, then cross into the a layer of the stator core slot No. 14 through the hairpin end, and then cross into the stator core slot No. 8 through the welding end. The b layer of the stator core slot, then crosses into the c layer of the stator core slot No. 1 through the hairpin end, and then crosses into the d layer of the stator core slot No. 43 through the welding end, and then crosses into the c layer of the stator core slot No. 37 through the hairpin end, and then crosses into the d layer of the stator core slot No. 31 through the welding end, and then crosses into the c layer of the stator core slot No. 25 through the hairpin end, and then crosses into the d layer of the stator core slot No. 19 through the welding end, and then crosses into the c layer of the stator core slot No. 13 through the hairpin end, and then crosses into the d layer of the stator core slot No. 7 through the welding end, and then the wiring is led out from the hairpin end.

[0068] The winding method of the first branch of the V-phase winding structure is: insert into the d layer of the 41st stator core slot of the hairpin end stator, then cross into the c layer of the 47th stator core slot through the welding end, then cross into the d layer of the 5th stator core slot through the hairpin end, then cross into the c layer of the 11th stator core slot through the welding end, then cross into the d layer of the 17th stator core slot through the hairpin end, then cross into the c layer of the 23rd stator core slot through the welding end, then cross into the d layer of the 29th stator core slot through the hairpin end, and then cross into the 35th stator core slot through the welding end. The c layer of the stator core slot, then crosses into the b layer of the stator core slot No. 42 through the hairpin end, and then crosses into the a layer of the stator core slot No. 48 through the welding end, and then crosses into the b layer of the stator core slot No. 6 through the hairpin end, and then crosses into the a layer of the stator core slot No. 12 through the welding end, and then crosses into the b layer of the stator core slot No. 18 through the hairpin end, and then crosses into the a layer of the stator core slot No. 24 through the welding end, and then crosses into the b layer of the stator core slot No. 30 through the hairpin end, and then crosses into the a layer of the stator core slot No. 36 through the welding end, and then the wiring is led out from the hairpin end.

[0069] The winding method of the second branch of the V-phase winding structure is: insert into the d layer of the 42nd stator core slot of the hairpin end stator, then cross into the c layer of the 48th stator core slot through the welding end, then cross into the d layer of the 6th stator core slot through the hairpin end, then cross into the c layer of the 12th stator core slot through the welding end, then cross into the d layer of the 18th stator core slot through the hairpin end, then cross into the c layer of the 24th stator core slot through the welding end, then cross into the d layer of the 30th stator core slot through the hairpin end, and then cross into the 36th stator core slot through the welding end. The c layer of the stator core slot, then crosses into the b layer of the stator core slot No. 41 through the hairpin end, and then crosses into the a layer of the stator core slot No. 47 through the welding end, and then crosses into the b layer of the stator core slot No. 5 through the hairpin end, and then crosses into the a layer of the stator core slot No. 11 through the welding end, and then crosses into the b layer of the stator core slot No. 17 through the hairpin end, and then crosses into the a layer of the stator core slot No. 23 through the welding end, and then crosses into the b layer of the stator core slot No. 29 through the hairpin end, and then crosses into the a layer of the stator core slot No. 35 through the welding end, and then the wiring is led out from the hairpin end.

[0070] The winding method of the third branch of the V-phase winding structure is: insert into the a layer of the 41st stator core slot of the hairpin end stator, then cross into the b layer of the 35th stator core slot through the welding end, then cross into the a layer of the 29th stator core slot through the hairpin end, then cross into the b layer of the 23rd stator core slot through the welding end, then cross into the a layer of the 17th stator core slot through the hairpin end, then cross into the b layer of the 11th stator core slot through the welding end, then cross into the a layer of the 5th stator core slot through the hairpin end, and then cross into the 47th stator core slot through the welding end. The b layer of the stator core slot, then crosses into the c layer of the stator core slot No. 42 through the hairpin end, and then crosses into the d layer of the stator core slot No. 36 through the welding end, and then crosses into the c layer of the stator core slot No. 30 through the hairpin end, and then crosses into the d layer of the stator core slot No. 24 through the welding end, and then crosses into the c layer of the stator core slot No. 18 through the hairpin end, and then crosses into the d layer of the stator core slot No. 12 through the welding end, and then crosses into the c layer of the stator core slot No. 6 through the hairpin end, and then crosses into the d layer of the stator core slot No. 48 through the welding end, and then the wiring is led out from the hairpin end.

[0071] The winding method of the fourth branch of the V-phase winding structure is: insert into the a layer of the stator core slot No. 2 of the hairpin end stator, then cross into the b layer of the stator core slot No. 44 through the welding end, then cross into the a layer of the stator core slot No. 38 through the hairpin end, then cross into the b layer of the stator core slot No. 32 through the welding end, then cross into the a layer of the stator core slot No. 26 through the hairpin end, then cross into the b layer of the stator core slot No. 20 through the welding end, then cross into the a layer of the stator core slot No. 14 through the hairpin end, and then cross into the stator core slot No. 8 through the welding end. The b layer of the stator core slot, then crosses into the c layer of the stator core slot No. 1 through the hairpin end, and then crosses into the d layer of the stator core slot No. 43 through the welding end, and then crosses into the c layer of the stator core slot No. 37 through the hairpin end, and then crosses into the d layer of the stator core slot No. 31 through the welding end, and then crosses into the c layer of the stator core slot No. 25 through the hairpin end, and then crosses into the d layer of the stator core slot No. 19 through the welding end, and then crosses into the c layer of the stator core slot No. 13 through the hairpin end, and then crosses into the d layer of the stator core slot No. 7 through the welding end, and then the wiring is led out from the hairpin end.

[0072] The winding method of the fourth branch of the V-phase winding structure is: insert into the a layer of the 42nd stator core slot of the hairpin end stator, then cross into the b layer of the 36th stator core slot through the welding end, then cross into the a layer of the 30th stator core slot through the hairpin end, then cross into the b layer of the 24th stator core slot through the welding end, then cross into the a layer of the 18th stator core slot through the hairpin end, then cross into the b layer of the 12th stator core slot through the welding end, then cross into the a layer of the 6th stator core slot through the hairpin end, and then cross into the 48th stator core slot through the welding end. The b layer of the stator core slot, then crosses into the c layer of the stator core slot No. 41 through the hairpin end, and then crosses into the d layer of the stator core slot No. 35 through the welding end, and then crosses into the c layer of the stator core slot No. 29 through the hairpin end, and then crosses into the d layer of the stator core slot No. 23 through the welding end, and then crosses into the c layer of the stator core slot No. 17 through the hairpin end, and then crosses into the d layer of the stator core slot No. 11 through the welding end, and then crosses into the c layer of the stator core slot No. 5 through the hairpin end, and then crosses into the d layer of the stator core slot No. 47 through the welding end, and then the wiring is led out from the hairpin end.

[0073] The winding method of the first branch of the W-phase winding structure is: insert into the d layer of the 45th stator core slot of the hairpin end stator, then cross into the c layer of the 3rd stator core slot through the welding end, then cross into the d layer of the 9th stator core slot through the hairpin end, then cross into the c layer of the 15th stator core slot through the welding end, then cross into the d layer of the 21st stator core slot through the hairpin end, then cross into the c layer of the 27th stator core slot through the welding end, then cross into the d layer of the 33rd stator core slot through the hairpin end, and then cross into the 39th stator core slot through the welding end. The c layer, then crosses into the b layer of stator core slot No. 46 through the hairpin end, and then crosses into the a layer of stator core slot No. 4 through the welding end, and then crosses into the b layer of stator core slot No. 10 through the hairpin end, and then crosses into the a layer of stator core slot No. 16 through the welding end, and then crosses into the b layer of stator core slot No. 22 through the hairpin end, and then crosses into the a layer of stator core slot No. 28 through the welding end, and then crosses into the b layer of stator core slot No. 34 through the hairpin end, and then crosses into the a layer of stator core slot No. 40 through the welding end, and then the wiring is led out from the hairpin end.

[0074] The winding method of the second branch of the W-phase winding structure is: insert into the d layer of the 46th stator core slot of the hairpin end stator, then cross into the c layer of the 4th stator core slot through the welding end, then cross into the d layer of the 10th stator core slot through the hairpin end, then cross into the c layer of the 16th stator core slot through the welding end, then cross into the d layer of the 22nd stator core slot through the hairpin end, then cross into the c layer of the 28th stator core slot through the welding end, then cross into the d layer of the 34th stator core slot through the hairpin end, and then cross into the 40th stator core slot through the welding end. The c layer of the stator core slot, then crosses into the b layer of the stator core slot No. 45 through the hairpin end, and then crosses into the a layer of the stator core slot No. 3 through the welding end, and then crosses into the b layer of the stator core slot No. 9 through the hairpin end, and then crosses into the a layer of the stator core slot No. 15 through the welding end, and then crosses into the b layer of the stator core slot No. 21 through the hairpin end, and then crosses into the a layer of the stator core slot No. 27 through the welding end, and then crosses into the b layer of the stator core slot No. 33 through the hairpin end, and then crosses into the a layer of the stator core slot No. 39 through the welding end, and then the wiring is led out from the hairpin end.

[0075] The winding method of the third branch of the W-phase winding structure is: insert into the a layer of the 45th stator core slot of the hairpin end stator, then cross into the b layer of the 39th stator core slot through the welding end, then cross into the a layer of the 33rd stator core slot through the hairpin end, then cross into the b layer of the 27th stator core slot through the welding end, then cross into the a layer of the 21st stator core slot through the hairpin end, then cross into the b layer of the 15th stator core slot through the welding end, then cross into the a layer of the 9th stator core slot through the hairpin end, and then cross into the 3rd stator core slot through the welding end. The b layer of the stator core slot, then crosses into the c layer of the stator core slot No. 46 through the hairpin end, and then crosses into the d layer of the stator core slot No. 40 through the welding end, and then crosses into the c layer of the stator core slot No. 34 through the hairpin end, and then crosses into the d layer of the stator core slot No. 28 through the welding end, and then crosses into the c layer of the stator core slot No. 22 through the hairpin end, and then crosses into the d layer of the stator core slot No. 16 through the welding end, and then crosses into the c layer of the stator core slot No. 10 through the hairpin end, and then crosses into the d layer of the stator core slot No. 4 through the welding end, and then the wiring is led out from the hairpin end.

[0076] The winding method of the fourth branch of the W-phase winding structure is as follows: insert into the a layer of the 46th stator core slot of the hairpin end stator, then cross into the b layer of the 40th stator core slot through the welding end, then cross into the a layer of the 34th stator core slot through the hairpin end, then cross into the b layer of the 28th stator core slot through the welding end, then cross into the a layer of the 22nd stator core slot through the hairpin end, then cross into the b layer of the 16th stator core slot through the welding end, then cross into the a layer of the 10th stator core slot through the hairpin end, and then cross into the 4th stator core slot through the welding end. The b layer of the stator core slot, then crosses into the c layer of the stator core slot No. 45 through the hairpin end, and then crosses into the d layer of the stator core slot No. 39 through the welding end, and then crosses into the c layer of the stator core slot No. 33 through the hairpin end, and then crosses into the d layer of the stator core slot No. 27 through the welding end, and then crosses into the c layer of the stator core slot No. 21 through the hairpin end, and then crosses into the d layer of the stator core slot No. 15 through the welding end, and then crosses into the c layer of the stator core slot No. 9 through the hairpin end, and then crosses into the d layer of the stator core slot No. 3 through the welding end, and then the wiring is led out from the hairpin end.

[0077] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A novel flat wire winding permanent magnet motor with unequal area, wherein the stator core (1) comprises a stator yoke (2) and a stator tooth (3), and the gaps between the plurality of stator teeth (3) constitute stator core slots; It is characterized in that The stator winding comprises two large-area flat wire windings (4) and two double-strand flat wire windings (5), and the large-area flat wire windings (4) and the double-strand flat wire windings (5) are both placed in the stator core slots; The stator core slot is rectangular; The two large-area flat wire windings (4) are connected in series, and the two double-strand flat wire windings (5) are connected in parallel; The thickness of the large-area flat wire winding (4) is greater than the thickness of the double-strand flat wire winding (5); The end connection methods of the stator windings of different branches are as follows: The hairpin ends (8) of all stator windings are arranged on the same side, and the welding ends (7) are arranged on the other side; The winding method of the first branch is as follows: the winding is lap-wound M times between the first stator core slot and the Lth stator core slot with the corresponding pitch, and the winding sequence is that the current flows into the stator winding in the Lth stator core slot through the welding end (7), and then returns from the hairpin end (8) of the Lth stator core slot to the hairpin end (8) of the first stator core slot, and finally flows out from the hairpin end (8) of the Lth stator core slot after M lap-wound times; The M is one half of the number of series turns per phase; Complete the winding of all branches in sequence in the above manner; The stator core (1) comprises 8 poles and 48 stator core slots arranged at intervals on a circumference, and each stator core slot has 8 layers of conductors arranged therein; the 48 stator core slots are numbered in sequence from 1 to 48, and the 4 flat wires are numbered in sequence from the outer diameter to the inner diameter in a, b, c, d; The winding method of the first branch of the U-phase winding structure is: insert into the d layer of the No. 1 stator core slot of the hairpin end stator, then cross into the c layer of the No. 7 stator core slot through the welding end, then cross into the d layer of the No. 13 stator core slot through the hairpin end, then cross into the c layer of the No. 19 stator core slot through the welding end, then cross into the d layer of the No. 25 stator core slot through the hairpin end, then cross into the c layer of the No. 31 stator core slot through the welding end, then cross into the d layer of the No. 37 stator core slot through the hairpin end, and then cross into the No. 43 stator core slot through the welding end. The c layer of the stator core slot, then crosses into the b layer of the stator core slot No. 2 through the hairpin end, then crosses into the a layer of the stator core slot No. 8 through the welding end, then crosses into the b layer of the stator core slot No. 14 through the hairpin end, then crosses into the a layer of the stator core slot No. 20 through the welding end, then crosses into the b layer of the stator core slot No. 26 through the hairpin end, then crosses into the a layer of the stator core slot No. 32 through the welding end, then crosses into the b layer of the stator core slot No. 38 through the hairpin end, then crosses into the a layer of the stator core slot No. 44 through the welding end, and then the wiring is led out from the hairpin end; The winding method of the second branch of the U-phase winding structure is: insert into the d layer of the No. 2 stator core slot of the hairpin end stator, then cross into the c layer of the No. 8 stator core slot through the welding end, then cross into the d layer of the No. 14 stator core slot through the hairpin end, then cross into the c layer of the No. 20 stator core slot through the welding end, then cross into the d layer of the No. 26 stator core slot through the hairpin end, then cross into the c layer of the No. 32 stator core slot through the welding end, then cross into the d layer of the No. 38 stator core slot through the hairpin end, and then cross into the 44 stator core slot through the welding end. The c layer of the slot, then crosses into the b layer of the No. 1 stator core slot through the hairpin end, then crosses into the a layer of the No. 7 stator core slot through the welding end, then crosses into the b layer of the No. 13 stator core slot through the hairpin end, then crosses into the a layer of the No. 19 stator core slot through the welding end, then crosses into the b layer of the No. 25 stator core slot through the hairpin end, then crosses into the a layer of the No. 31 stator core slot through the welding end, then crosses into the b layer of the No. 37 stator core slot through the hairpin end, then crosses into the a layer of the No. 43 stator core slot through the welding end, and then the wiring is led out from the hairpin end; The winding method of the third branch of the U-phase winding structure is as follows: insert into the a layer of the stator core slot No. 1 of the hairpin end stator, then cross into the b layer of the stator core slot No. 43 through the welding end, then cross into the a layer of the stator core slot No. 37 through the hairpin end, then cross into the b layer of the stator core slot No. 31 through the welding end, then cross into the a layer of the stator core slot No. 25 through the hairpin end, then cross into the b layer of the stator core slot No. 19 through the welding end, then cross into the a layer of the stator core slot No. 13 through the hairpin end, and then cross into the stator core slot No. 7 through the welding end. The b layer of the stator core slot, then crosses into the c layer of the stator core slot No. 2 through the hairpin end, then crosses into the d layer of the stator core slot No. 44 through the welding end, then crosses into the c layer of the stator core slot No. 38 through the hairpin end, then crosses into the d layer of the stator core slot No. 32 through the welding end, then crosses into the c layer of the stator core slot No. 26 through the hairpin end, then crosses into the d layer of the stator core slot No. 20 through the welding end, then crosses into the c layer of the stator core slot No. 14 through the hairpin end, then crosses into the d layer of the stator core slot No. 8 through the welding end, and then the wiring is led out from the hairpin end; The winding method of the fourth branch of the U-phase winding structure is: insert into the a layer of the stator core slot No. 2 of the hairpin end stator, then cross into the b layer of the stator core slot No. 44 through the welding end, then cross into the a layer of the stator core slot No. 38 through the hairpin end, then cross into the b layer of the stator core slot No. 32 through the welding end, then cross into the a layer of the stator core slot No. 26 through the hairpin end, then cross into the b layer of the stator core slot No. 20 through the welding end, then cross into the a layer of the stator core slot No. 14 through the hairpin end, and then cross into the stator core slot No. 8 through the welding end. The b layer of the stator core slot, then crosses into the c layer of the stator core slot No. 1 through the hairpin end, then crosses into the d layer of the stator core slot No. 43 through the welding end, then crosses into the c layer of the stator core slot No. 37 through the hairpin end, then crosses into the d layer of the stator core slot No. 31 through the welding end, then crosses into the c layer of the stator core slot No. 25 through the hairpin end, then crosses into the d layer of the stator core slot No. 19 through the welding end, then crosses into the c layer of the stator core slot No. 13 through the hairpin end, then crosses into the d layer of the stator core slot No. 7 through the welding end, and then the wiring is led out from the hairpin end; The winding method of the first branch of the V-phase winding structure is: insert into the d layer of the 41st stator core slot of the hairpin end stator, then cross into the c layer of the 47th stator core slot through the welding end, then cross into the d layer of the 5th stator core slot through the hairpin end, then cross into the c layer of the 11th stator core slot through the welding end, then cross into the d layer of the 17th stator core slot through the hairpin end, then cross into the c layer of the 23rd stator core slot through the welding end, then cross into the d layer of the 29th stator core slot through the hairpin end, and then cross into the 35th stator core slot through the welding end. The c layer of the stator core slot, then crosses into the b layer of the stator core slot No. 42 through the hairpin end, then crosses into the a layer of the stator core slot No. 48 through the welding end, then crosses into the b layer of the stator core slot No. 6 through the hairpin end, then crosses into the a layer of the stator core slot No. 12 through the welding end, then crosses into the b layer of the stator core slot No. 18 through the hairpin end, then crosses into the a layer of the stator core slot No. 24 through the welding end, then crosses into the b layer of the stator core slot No. 30 through the hairpin end, then crosses into the a layer of the stator core slot No. 36 through the welding end, and then the wiring is led out from the hairpin end; The winding method of the second branch of the V-phase winding structure is: insert into the d layer of the 42nd stator core slot of the hairpin end stator, then cross into the c layer of the 48th stator core slot through the welding end, then cross into the d layer of the 6th stator core slot through the hairpin end, then cross into the c layer of the 12th stator core slot through the welding end, then cross into the d layer of the 18th stator core slot through the hairpin end, then cross into the c layer of the 24th stator core slot through the welding end, then cross into the d layer of the 30th stator core slot through the hairpin end, and then cross into the 36th stator core slot through the welding end. The c layer of the stator core slot, then crosses into the b layer of the stator core slot No. 41 through the hairpin end, then crosses into the a layer of the stator core slot No. 47 through the welding end, then crosses into the b layer of the stator core slot No. 5 through the hairpin end, then crosses into the a layer of the stator core slot No. 11 through the welding end, then crosses into the b layer of the stator core slot No. 17 through the hairpin end, then crosses into the a layer of the stator core slot No. 23 through the welding end, then crosses into the b layer of the stator core slot No. 29 through the hairpin end, then crosses into the a layer of the stator core slot No. 35 through the welding end, and then the wiring is led out from the hairpin end; The winding method of the third branch of the V-phase winding structure is: insert into the a layer of the 41st stator core slot of the hairpin end stator, then cross into the b layer of the 35th stator core slot through the welding end, then cross into the a layer of the 29th stator core slot through the hairpin end, then cross into the b layer of the 23rd stator core slot through the welding end, then cross into the a layer of the 17th stator core slot through the hairpin end, then cross into the b layer of the 11th stator core slot through the welding end, then cross into the a layer of the 5th stator core slot through the hairpin end, and then cross into the 47th stator core slot through the welding end. The b layer of the stator core slot, then crosses into the c layer of the stator core slot No. 42 through the hairpin end, then crosses into the d layer of the stator core slot No. 36 through the welding end, then crosses into the c layer of the stator core slot No. 30 through the hairpin end, then crosses into the d layer of the stator core slot No. 24 through the welding end, then crosses into the c layer of the stator core slot No. 18 through the hairpin end, then crosses into the d layer of the stator core slot No. 12 through the welding end, then crosses into the c layer of the stator core slot No. 6 through the hairpin end, then crosses into the d layer of the stator core slot No. 48 through the welding end, and then leads the wiring from the hairpin end; The winding method of the fourth branch of the V-phase winding structure is: insert into the a layer of the 42nd stator slot of the hairpin end stator, then cross into the b layer of the 36th stator slot through the welding end, then cross into the a layer of the 30th stator slot through the hairpin end, then cross into the b layer of the 24th stator slot through the welding end, then cross into the a layer of the 18th stator slot through the hairpin end, then cross into the b layer of the 12th stator slot through the welding end, then cross into the a layer of the 6th stator slot through the hairpin end, and then cross into the 48th stator slot through the welding end. The b layer of the stator slot, then crosses into the c layer of the stator slot No. 41 through the hairpin end, then crosses into the d layer of the stator slot No. 35 through the welding end, then crosses into the c layer of the stator slot No. 29 through the hairpin end, then crosses into the d layer of the stator slot No. 23 through the welding end, then crosses into the c layer of the stator slot No. 17 through the hairpin end, then crosses into the d layer of the stator slot No. 11 through the welding end, then crosses into the c layer of the stator slot No. 5 through the hairpin end, then crosses into the d layer of the stator slot No. 47 through the welding end, and then leads the wiring from the hairpin end; The winding method of the first branch of the W-phase winding structure is: insert into the d layer of the 45th stator slot of the hairpin end stator, then cross into the c layer of the 3rd stator slot through the welding end, then cross into the d layer of the 9th stator slot through the hairpin end, then cross into the c layer of the 15th stator slot through the welding end, then cross into the d layer of the 21st stator slot through the hairpin end, then cross into the c layer of the 27th stator slot through the welding end, then cross into the d layer of the 33rd stator slot through the hairpin end, and then cross into the 39th stator slot through the welding end. c layer, then cross into the b layer of No. 46 stator slot through the hairpin end, then cross into the a layer of No. 4 stator slot through the welding end, then cross into the b layer of No. 10 stator slot through the hairpin end, then cross into the a layer of No. 16 stator slot through the welding end, then cross into the b layer of No. 22 stator slot through the hairpin end, then cross into the a layer of No. 28 stator slot through the welding end, then cross into the b layer of No. 34 stator slot through the hairpin end, then cross into the a layer of No. 40 stator slot through the welding end, and then lead out the wiring from the hairpin end; The winding method of the second branch of the W-phase winding structure is: insert into the d layer of the 46th stator slot of the hairpin end stator, then cross into the c layer of the 4th stator slot through the welding end, then cross into the d layer of the 10th stator slot through the hairpin end, then cross into the c layer of the 16th stator slot through the welding end, then cross into the d layer of the 22nd stator slot through the hairpin end, then cross into the c layer of the 28th stator slot through the welding end, then cross into the d layer of the 34th stator slot through the hairpin end, and then cross into the 40th stator slot through the welding end. The c layer of the slot, then crosses into the b layer of the stator slot No. 45 through the hairpin end, then crosses into the a layer of the stator slot No. 3 through the welding end, then crosses into the b layer of the stator slot No. 9 through the hairpin end, then crosses into the a layer of the stator slot No. 15 through the welding end, then crosses into the b layer of the stator slot No. 21 through the hairpin end, then crosses into the a layer of the stator slot No. 27 through the welding end, then crosses into the b layer of the stator slot No. 33 through the hairpin end, then crosses into the a layer of the stator slot No. 39 through the welding end, and then the wiring is led out from the hairpin end; The winding method of the third branch of the W-phase winding structure is: insert into the a layer of the 45th stator slot of the hairpin end stator, then cross into the b layer of the 39th stator slot through the welding end, then cross into the a layer of the 33rd stator slot through the hairpin end, then cross into the b layer of the 27th stator slot through the welding end, then cross into the a layer of the 21st stator slot through the hairpin end, then cross into the b layer of the 15th stator slot through the welding end, then cross into the a layer of the 9th stator slot through the hairpin end, and then cross into the 3rd stator slot through the welding end. The b layer, then crosses into the c layer of the 46th stator slot through the hairpin end, then crosses into the d layer of the 40th stator slot through the welding end, then crosses into the c layer of the 34th stator slot through the hairpin end, then crosses into the d layer of the 28th stator slot through the welding end, then crosses into the c layer of the 22nd stator slot through the hairpin end, then crosses into the d layer of the 16th stator slot through the welding end, then crosses into the c layer of the 10th stator slot through the hairpin end, then crosses into the d layer of the 4th stator slot through the welding end, and then leads out the wiring from the hairpin end; The winding method of the fourth branch of the W-phase winding structure is as follows: insert into the a layer of the 46th stator slot of the hairpin end stator, then cross into the b layer of the 40th stator slot through the welding end, then cross into the a layer of the 34th stator slot through the hairpin end, then cross into the b layer of the 28th stator slot through the welding end, then cross into the a layer of the 22nd stator slot through the hairpin end, then cross into the b layer of the 16th stator slot through the welding end, then cross into the a layer of the 10th stator slot through the hairpin end, and then cross into the 4th stator slot through the welding end. The b layer of the stator slot, then crosses into the c layer of the stator slot No. 45 through the hairpin end, and then crosses into the d layer of the stator slot No. 39 through the welding end, and then crosses into the c layer of the stator slot No. 33 through the hairpin end, and then crosses into the d layer of the stator slot No. 27 through the welding end, and then crosses into the c layer of the stator slot No. 21 through the hairpin end, and then crosses into the d layer of the stator slot No. 15 through the welding end, and then crosses into the c layer of the stator slot No. 9 through the hairpin end, and then crosses into the d layer of the stator slot No. 3 through the welding end, and then the wiring is led out from the hairpin end.

2. The novel flat wire winding permanent magnet motor with unequal area according to claim 1 is characterized in that: The area of ​​the large-area flat wire winding (4) is larger than the area of ​​the two-strand flat wire winding (5).

3. The novel flat wire winding permanent magnet motor with unequal area according to claim 1 is characterized in that: It also includes an insulation structure, and the insulation structure includes slot insulation and winding insulation; The slot insulation is placed inside the stator core slot; The winding insulation is placed between adjacent windings of the stator winding.

4. The novel flat wire winding permanent magnet motor with unequal area according to claim 1 is characterized in that: The stator winding includes a U-phase winding, a V-phase winding and a W-phase winding; Each branch includes stator windings in stator core slots at relative positions of each pole pair connected in series, so as to distribute stator winding units in different stator core slots to each branch; The conductors of the parallel branches connect all the conductor layers in sequence to balance the resistance and potential of each branch.

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