A multi-layer hairpin-type flat wire winding, stator and motor

Abstract

A multi-layer hairpin-type flat wire winding stator includes a stator core and a hairpin flat wire wave winding. The stator core is provided with a stator slot. The hairpin flat wire wave winding is embedded in the stator slot. The hairpin flat wire wave winding includes more than two branches. The stator slots where the three-phase windings of the hairpin flat wire wave winding are located are spaced apart from each other and arranged in sequence. Any branch is transposed to the equivalent slot of the adjacent stator slot after circling half of the layers. When transposed to the equivalent slot of the adjacent stator slot across layers, a long-distance or short-distance connection is adopted, so that the head end and tail end of any branch are both located in the innermost layer and outermost layer along the radial direction of the stator. The present invention only has a long-distance or short-distance connection when transposed to the equivalent slot of the adjacent stator slot across layers, so that the head end and tail end of the branch are both located in the innermost layer and outermost layer along the radial direction of the armature, and each phase single branch will pass through the equivalent position of all layers of all stator slots in the phase.

Description

Technical Field

[0001] The invention relates to the field of electricity, in particular to a motor, and more particularly to a multi-layer hairpin-type flat wire winding stator and a motor. Background Art

[0002] With the increasing development of flat wire motors, the diversity and complexity of flat wire motor windings in the existing technology has greatly increased the difficulty of automated production of motors, and also brought other risks such as increased insulation risk and increased costs. At the same time, the complexity of the windings has increased the size of the motor and increased the space occupied. Summary of the invention

[0003] The object of the present invention is to provide a multi-layer hairpin-type flat wire winding stator and a motor, which can solve the technical problems of the flat wire motor winding stator in the prior art, such as the complex structure and great difficulty in production and manufacturing.

[0004] The present invention discloses a multi-layer hairpin flat wire winding stator, comprising a stator core and a hairpin flat wire wave winding, wherein a stator slot is arranged in the stator core, wherein the hairpin flat wire wave winding is embedded in the stator slot, wherein the hairpin flat wire wave winding comprises more than two branches, wherein any one branch is formed by connecting a plurality of unit hairpin wires, wherein the hairpin flat wire wave winding is a three-phase winding, wherein the stator slots where the three-phase windings are located are spaced apart from each other and arranged in sequence, wherein any two adjacent stator slots of any phase arranged in sequence are adjacent to the next same stator slot. Two adjacent stator slots of the phase correspond to each other in sequence to form equivalent slots in turn. The two pin conductors of any unit hairpin wire are distributed from a certain layer of a stator slot to the adjacent layer of the next equivalent slot. Any branch is transposed to the equivalent slot of the adjacent stator slot after circling half of the layers. When transposed to the equivalent slot of the adjacent stator slot across layers, a long-distance or short-distance connection is adopted, so that the head end and the tail end of any branch are located at the innermost layer and the outermost layer along the radial direction of the stator.

[0005] Furthermore, the number of stator slots is an integer multiple of twelve, the number of layers of coils in any branch is an even number greater than four, the number of branches of the wave winding is an even number less than or equal to half the number of coil layers, and the conductors contained in any branch are distributed in all stator slots of its phase or all layers of its equivalent slots.

[0006] Furthermore, the head ends of all branches of the same phase are connected in parallel to form the lead-out wires of the motor, and the tail ends of all branches are connected together to form a star point end, forming a star connection.

[0007] Furthermore, the head end and tail end of the same phase branch are connected in parallel respectively, and then connected head to tail with other phases to form a triangle connection.

[0008] A flat wire motor of the present invention comprises the stator.

[0009] Compared with the prior art, the present invention has a positive and obvious effect. The multi-layer hairpin flat wire winding of the present invention only has long or short distance connections when it is transposed across layers to the equivalent slots of adjacent slots, so that the head and tail ends of the branch are located at the innermost and outermost layers along the radial direction of the armature, and each phase single branch will pass through the equivalent positions of all slots and all layers of the phase, and each branch is spirally connected along the radial direction of the stator circumference, which reduces the complexity of the winding, makes the winding connection simpler, and is easier to manufacture. Compared with conventional windings, the present invention reduces the radial space and axial height, so that the winding space accounts for a small proportion, has the characteristics of simple cross-layer and few welding points, thereby saving material costs and manufacturing costs, and improving insulation reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The present invention is a schematic diagram of a multi-layer hairpin flat wire winding stator and a winding structure of a motor.

[0011] Figure 2 The present invention is a schematic diagram of the winding principle of a multi-layer hairpin flat wire winding stator and a motor.

[0012] Figure 3 The figure is a schematic diagram of the number of winding layers of a multi-layer hairpin-type flat wire winding stator and a motor of the present invention.

[0013] Figure 4 The present invention is a schematic structural diagram of a multi-layer hairpin-type flat wire winding stator and a hairpin wire in a motor.

[0014] Figure 5 The present invention is a schematic diagram of a multi-layer hairpin flat wire winding stator and U-phase connection in a motor.

[0015] Figure 6 The present invention is a schematic diagram of a multi-layer hairpin flat wire winding stator and V-phase connection in a motor.

[0016] Figure 7 The diagram is a schematic diagram of the W-phase connection in a multi-layer hairpin-type flat wire winding stator and a motor according to the present invention. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the embodiments, and all similar structures and similar variations of the present invention should be included in the protection scope of the present invention. The use of directions such as up, down, front, back, left, and right in the present invention is only for the convenience of description and is not a limitation on the technical solution of the present invention.

[0018] like Figure 1-Figure 7As shown, a multi-layer hairpin flat wire winding stator of the present invention comprises a stator core and a hairpin flat wire wave winding, wherein a stator slot is arranged in the stator core, the hairpin flat wire wave winding is embedded in the stator slot, the hairpin flat wire wave winding comprises more than two branches, any one of the branches is formed by connecting a plurality of unit hairpin wires, the stator slots where the three-phase windings of the hairpin flat wire wave winding are located are spaced apart from each other and arranged in sequence, and any two adjacent stator slots of any phase arranged in sequence are adjacent to the next same phase Two adjacent stator slots correspond to each other in sequence to form equivalent slots in turn. The two pin conductors of any unit hairpin wire are distributed from a certain layer of a stator slot to the adjacent layer of the next equivalent slot. After circling half of the layers, any branch is transposed to the equivalent slot of the adjacent stator slot. When transposed to the equivalent slot of the adjacent stator slot across the layers, a long distance or short distance connection is adopted, so that the head end and the tail end of any branch are located at the innermost layer and the outermost layer along the radial direction of the stator.

[0019] Furthermore, the number of stator slots is an integer multiple of twelve, the number of layers of coils in any branch is an even number greater than four, the number of branches of the wave winding is an even number less than or equal to half the number of coil layers, and the conductors contained in any branch are distributed in all stator slots of its phase or all layers of its equivalent slots.

[0020] Furthermore, the head ends of all branches of the same phase are connected in parallel to form the lead-out wires of the motor, and the tail ends of all branches are connected together to form a star point end, forming a star connection.

[0021] Furthermore, the head end and tail end of the same phase branch are connected in parallel respectively, and then connected head to tail with other phases to form a triangle connection.

[0022] A flat wire motor of the present invention comprises the stator.

[0023] Example 1

[0024] This embodiment is explained by taking 48 slots, 8 poles, 8 layers, three phases, 4 branches, and star connection as an example. The lead-out wire end is a three-phase lead-out wire. The tail ends of all the branches are connected together to form a star point line end, forming a three-phase 4-branch parallel star-connected armature, thereby forming a motor.

[0025] like Figure 2 As shown, the embodiment of the present invention is described by taking 48 slots, 4 pole pairs, 4 parallel branches per phase, and 8 conductor layers per slot as an example. The implementation method is:

[0026] The flat copper wire wave winding armature winding of the present embodiment has an 8-layer wave winding structure, and the winding lead-out terminal terminals U1+, U2+, U3+, U4+, U1-, U2-, U3-, U4-, V1+, V2+, V3+, V4+, V1-, V2-, V3-, V4-, W1+, W2+, W3+, W4+, W1-, W2-, W3-, and W4- correspond to the four branches of the three-phase UVW respectively, and those with the suffix "+" are connected in parallel to form the lead-out wires of the three phases. When corresponding to the actual windings, they are evenly distributed in the radial inner and outer layers of the armature winding; those with the suffix "-" are the tail ends of the three phases, and all are connected together to form a star point. When corresponding to the actual windings, they are welded together and evenly distributed in the radial inner and outer layers of the armature winding.

[0027] The slots where the three phases of this embodiment are located are divided into: the slots where the U phase is located are: the 1st, 2nd, 7th, 8th, 13th, 14th, 19th, 20th, 25th, 26th, 31st, 32nd, 37th, 38th, 43rd, and 44th slots; the slots where the V phase is located are: the 5th, 6th, 11th, 12th, 17th, 18th, 23rd, 24th, 29th, 30th, 35th, 36th, 41st, 42nd, 47th, and 48th slots; the slots where the W phase is located are: the 3rd, 4th, 9th, 10th, 15th, 16th, 21st, 22nd, 27th, 28th, 33rd, 34th, 39th, 40th, 45th, and 46th. The number of slots in the three phases mentioned above is equal, that is, 16 slots each, and they are evenly distributed between phases. The current directions of the two adjacent slots of the same phase are consistent, and the current directions of the next group are opposite. Assuming that the current directions of slots 1 and 2 are positive, then the currents of slots 3 and 4 are negative, the current directions of slots 5 and 6 are positive, and the current directions of slots 7 and 8 are negative, and so on.

[0028] like Figure 5 As shown, the lead wires of the four parallel branches (U1+, U2+, U3+, U4+) of the U-phase winding are respectively led out from the 8th and 1st layers of the 1st slot, the 8th and 1st layers of the 2nd slot, and the tail ends are respectively led out from the 1st layer of the 43rd slot, the 1st layer of the 44th slot, the 8th layer of the 7th slot, and the 8th layer of the 8th slot. The overall flow direction of the winding is spiral. The overall span is 6, one pin of the unit hairpin is in the 1st slot, the other pin is in the 7th slot, and so on. And each cross-layer is an adjacent cross-layer.

[0029] The U1 branch is routed from the 8th layer of the 1st slot to the 1st layer of the 44th slot, first on the 8th and 7th layers, then on the 6th and 5th layers, and after the 5th layer of the 43rd slot, it jumps to the 4th layer of the 2nd slot, then on the 4th and 3rd layers, then on the 2nd and 1st layers, and finally leads out from the 1st layer of the 44th slot;

[0030] The U2 branch is routed from the 8th floor of the 2nd slot to the 1st floor of the 43rd slot, first on the 8th and 7th floors, then on the 6th and 5th floors, and after the 5th floor of the 44th slot, it jumps to the 4th floor of the 1st slot, then on the 4th and 3rd floors, then on the 2nd and 1st floors, and finally leads out from the 1st floor of the 43rd slot;

[0031] like Figure 5 As shown, both branches U1 and U2 start from the 1st and 2nd slots and spiral to the right (left).

[0032] The U3 branch is routed from the 1st layer of the 1st slot to the 8th layer of the 8th slot, first on the 1st and 2nd layers, then on the 3rd and 4th layers, and after the 4th layer of the 7th slot, it jumps to the 5th layer of the 2nd slot, then on the 5th and 6th layers, then on the 7th and 8th layers, and finally leads out from the 8th layer of the 8th slot;

[0033] The U4 branch is routed in a spiral from the 1st layer of the 2nd slot to the 8th layer of the 7th slot, first on the 1st and 2nd layers, then on the 3rd and 4th layers, and after finishing on the 4th layer of the 8th slot, it jumps to the 5th layer of the 1st slot, then proceeds to the 5th and 6th layers, then on the 7th and 8th layers, and finally leads out from the 8th layer of the 7th slot.

[0034] Figure 5 The U3 and U4 branches shown both start from the 1st and 2nd slots and spiral to the left (right).

[0035] The V-phase winding and the W-phase winding have the same rules as the U-phase winding. The principle expansion diagram is as follows: Figure 2 As shown, the end connections are as follows Figure 6 and Figure 7 shown.

[0036] Figure 6 The V1 and V2 branches shown both start from the 5th and 6th slots and spiral to the right (left).

[0037] Figure 6 The V3 and V4 branches shown both start from the 5th and 6th slots and spiral to the left (right).

[0038] Figure 7 The W1 and W2 branches shown both start from the 9th and 10th slots and spiral to the right (left).

[0039] Figure 7 The W3 and W4 branches shown both start from the 9th and 10th slots and spiral to the left (right).

[0040] Finally, U1-, V1-, and W1- are connected to form the first star point, U2-, V2-, and U2- are connected to form the second star point, U3-, V3-, and W3- are connected to form the third star point, and U4-, V4-, and W4- are connected to form the fourth star point.

[0041] Example 2

[0042] According to the first embodiment, the connection method of the four branches per phase can be that all branches of the same phase are connected end to end to form one branch, and then a star connection or a triangle connection is implemented.

[0043] Example 3

[0044] According to Example 1, the connection method of four branches per phase can be that two branches of the same phase are first connected in series and then in parallel, that is, U1 is connected in series with U3, U2 is connected in series with U4, U1, U3 and U2, U4 are connected in parallel to form two branches, and then a star connection or a triangle connection is implemented.

[0045] The present invention discloses a multi-layer hairpin flat wire winding stator, in which long-distance or short-distance connections occur only when the layers are transposed to the equivalent slots of adjacent slots, so that the head and tail ends of the branches are located at the innermost and outermost layers along the radial direction of the armature, and the single branch of each phase passes through the equivalent positions of all slots and all layers of the phase, and each branch is spirally connected along the radial direction of the stator circumference, thereby reducing the complexity of the winding, making the winding connection simpler and easier to produce. Compared with conventional windings, the present invention reduces the radial space and axial height, so that the winding space occupies a small proportion, has the characteristics of simple cross-layer and few welding points, thereby saving material cost and manufacturing cost, and improving insulation reliability.

Claims

1. A multi-layer hairpin flat wire winding stator, characterized in that: The invention comprises a stator core and a hairpin flat wave winding, wherein a plurality of stator slots are arranged in the stator core, the hairpin flat wave winding is embedded in the stator slot, the hairpin flat wave winding comprises more than two branches, any one of the branches is formed by connecting a plurality of unit hairpin wires, the hairpin flat wave winding is a three-phase winding, the stator slots where the three-phase winding is located are spaced apart from each other and arranged in sequence, any two adjacent stator slots of any phase arranged in sequence correspond to the next two adjacent stator slots of the same phase in sequence to form equivalent slots, the two pin conductors of any unit hairpin wire are distributed from a certain layer of a stator slot to an adjacent layer of the next equivalent slot, any one branch is transposed to an equivalent slot of an adjacent stator slot after circling half of the layers, and a long-distance or short-distance connection is adopted when transposed to an equivalent slot of an adjacent stator slot across layers, so that the head end and the tail end of any one branch are both located at the innermost layer and the outermost layer along the radial direction of the stator.

2. A multi-layer hairpin flat wire winding stator according to claim 1, characterized in that: The number of stator slots is an integer multiple of twelve, the number of layers of coils in any branch is an even number greater than four, the number of branches of the wave winding is an even number less than or equal to half the number of coil layers, and the conductors contained in any branch are distributed in all stator slots of its phase or all layers of its equivalent slots.

3. The multi-layer hairpin flat wire winding stator according to claim 1, characterized in that: The head ends of all branches of the same phase are connected in parallel to form the lead-out wires of the motor, and the tail ends of all branches are connected together to form a star point end, forming a star connection.

4. The multi-layer hairpin flat wire winding stator according to claim 1, characterized in that: The head and tail ends of the same phase branch are connected in parallel, and then connected to the heads and tails of other phases to form a triangle connection.

5. A flat wire motor, characterized in that: Comprising the stator as claimed in claim 1.

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