Stator of flat wire motor

Abstract

The utility model provides a stator of a flat wire motor, a flat wire winding is provided with a three-phase winding, the pole number of the flat wire winding is 8, the number of winding grooves of an iron core is 48, the flat wire winding forms four layers in the winding grooves, the winding groove occupied by the flat wire winding of each phase at each pole comprises an inner side occupying position and an outer side occupying position, the inner side occupying positions are two continuous winding grooves located in two layers of the radial inner side, the outer side occupying positions are two continuous winding grooves located in two layers of the radial outer side, and the inner side occupying positions and the outer side occupying positions are staggered by one groove position in the circumferential direction. According to the stator of the flat wire motor, the winding mode is simple, the structure of the wire outlet end is simple, the size occupied by the wire outlet end connecting structure is small, and the overall harmonic influence of the winding is small.

Description

Technical Field

[0001] The present application relates to the field of motors, and in particular to a stator of a flat wire motor using flat wires as windings. Background Art

[0002] Taking the motor of new energy vehicles as an example, the motor stator using flat wire as winding has a higher copper full rate, which can improve the power density of the motor.

[0003] Flat wire, also known as flat copper wire, is an enameled wire with a roughly rectangular cross-section. Flat wire used in flat wire motors generally has two general forms, one is a U-shaped sub-conductor that is roughly U-shaped, and the other is an I-shaped sub-conductor that is roughly I-shaped. The U-shaped sub-conductor has two legs for inserting into the stator slots, and the two legs are connected at one end, which is also called the crown end of the stator. The I-shaped sub-conductor has one leg for inserting into the stator slot. Utility Model Content

[0004] The present application provides a stator of a flat wire motor, wherein the flat wire winding has a three-phase winding, the number of poles of the flat wire winding is 8, and the number of winding slots of the iron core is 48, wherein:

[0005] The flat wire winding forms 4 layers in the winding slot.

[0006] The winding slots occupied by the flat wire winding of each phase at each pole include: inner slots and outer slots,

[0007] The inner spacers are two continuous winding grooves located in two radially inner layers, and the outer spacers are two continuous winding grooves located in two radially outer layers. The inner spacers and the outer spacers are staggered by one groove in the circumferential direction.

[0008] In at least one embodiment, the flat wire winding of each phase includes 1 or 2 branches, each of the branches includes a plurality of sub-conductors, the sub-conductors include 2 I-shaped sub-conductors and a plurality of U-shaped sub-conductors, the two legs of the U-shaped sub-conductor are connected at one end to form a crown end and are separated at the other end to form a welding end, and the two I-shaped sub-conductors are respectively located at the incoming end and the outgoing end of each branch.

[0009] In at least one embodiment, the routing order of each branch is:

[0010] Extending from the radially outermost layer to the radially innermost layer along a first direction on the circumference, and then extending from the radially innermost layer to the radially outermost layer along a second direction on the circumference opposite to the first direction, and repeating this process until the outlet end of the branch, or

[0011] Extend from the radially innermost layer to the radially outermost layer along a first circumferential direction, then extend from the radially outermost layer to the radially innermost layer along a second circumferential direction opposite to the first direction, and repeat this process until the outlet end of the branch.

[0012] In at least one embodiment, the two legs of adjacent sub-conductors welded together belong to the first layer and the second layer, and the third layer and the fourth layer, respectively, and the span of the two legs of adjacent sub-conductors welded together is 6.

[0013] In at least one embodiment, in the two radially middle layers, the two legs of each U-shaped sub-conductor are located in adjacent layers, and the span of each U-shaped sub-conductor is 7 or 5.

[0014] In the radially innermost layer and the radially outermost layer, the two legs of each U-shaped sub-conductor are located in the same layer.

[0015] In at least one embodiment, the flat wire winding of each phase includes two branches.

[0016] In the radial innermost layer, the span of each U-shaped sub-conductor is 6; in the radial outermost layer, the spans of the two U-shaped sub-conductors of each pole are 5 and 7 respectively, or

[0017] In the radially outermost layer, the span of each U-shaped sub-conductor is 6; in the radially innermost layer, the spans of the two U-shaped sub-conductors of each pole are 5 and 7 respectively.

[0018] In at least one embodiment, the two branches are connected in parallel, or the two branches are connected in series.

[0019] In at least one embodiment, the flat wire winding of each phase includes one branch, and an inlet end and an outlet end of the branch are located at two adjacent poles.

[0020] In at least one embodiment, the spans of the U-shaped sub-conductors in the radially innermost layer and the radially outermost layer are 6, 5, or 7.

[0021] In at least one embodiment, the radially innermost and radially outermost U-shaped sub-conductors have a span of 5 or 7 only at one location in the entire branch, which is located at the two poles where the U-shaped sub-conductors connect the incoming and outgoing terminals.

[0022] The stator winding method of the flat wire motor according to the present application is simple, the structure of the output terminal is simple, the size occupied by the output terminal connection structure is small, and the harmonic influence of the entire winding is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of a stator of a flat wire motor according to a first embodiment of the present application.

[0024] Figure 2 This is a schematic diagram of the wiring sequence of one phase winding of the stator of the flat wire motor according to the first embodiment of the present application observed from the crown end.

[0025] Figure 3 This is a schematic diagram of the wiring sequence of one phase winding of the stator of the flat wire motor according to the first embodiment of the present application observed from the welding end.

[0026] Figure 4 This is a schematic diagram of the wiring sequence of one phase winding of the stator of the flat wire motor according to the second embodiment of the present application observed from the crown end.

[0027] Figure 5 This is a schematic diagram of the wiring sequence of one phase winding of the stator of the flat wire motor according to the second embodiment of the present application observed from the welding end.

[0028] Figure 6 is a schematic diagram of a stator of a flat wire motor according to a third embodiment of the present application.

[0029] Figure 7 It is a schematic diagram of the wiring sequence of one phase winding of the stator of the flat wire motor according to the third embodiment of the present application.

[0030] Description of reference numerals:

[0031] S core; W winding. DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.

[0033] Reference Figure 1 The stator of the flat wire motor provided in the present application (hereinafter referred to as the stator) includes a stator core S and a winding W. The core S has 48 stator slots, forming a total of 6 magnetic poles. Four layers of windings are formed in the slots in the radial direction, that is, in each slot, four legs of sub-conductors are stacked in the radial direction to form four layers. The stator includes a three-phase winding, and the winding of each phase includes two branches.

[0034] First embodiment

[0035] Figure 2 and Figure 3 2 shows the way in which one phase winding of the stator of this embodiment is routed in the slot. Figure 2 The position and connection order of each sub-conductor as viewed from the crown end. Figure 3It is the position and connection sequence of each sub-conductor observed from the welding end. Each column in the figure represents a stator slot, and each row represents a layer in the slot. In the figure, A+digital sequence represents the routing sequence of the first branch (or A branch), and B+digital sequence represents the routing sequence of the second branch (or B branch); taking A branch as an example, it extends in the order of A1-A2-…-A32, A1 is the incoming end, and A32 is the outgoing end. The thick line in the figure represents A branch, the thin line represents B branch, and the dotted line represents the two legs of two adjacent sub-conductors welded together.

[0036] In this embodiment, the first layer is the radially outermost layer, and the fourth layer is the radially innermost layer. It should be understood that in other possible embodiments, the first layer may be the radially innermost layer, and the fourth layer may be the radially outermost layer.

[0037] In this embodiment, the routing order of each branch is: along the first direction on the circumference (the direction in which the slot numbers increase from small to large in the figure), extending from the radial outermost layer to the radial innermost layer, for example, the section extending from A1 to A5; then along the second direction on the circumference opposite to the first direction (the direction in which the slot numbers decrease from large to small in the figure), extending from the radial innermost layer to the radial outermost layer, for example, the section extending from A5 to A8, and so on until the outlet end of the branch.

[0038] The two branches of each phase are connected in series or in parallel. Figure 2 It can be seen that the incoming wire ends of the two branches are located in adjacent slots, and the outgoing wire ends of the two branches are located in adjacent slots. The incoming wire end and the outgoing wire end of the same branch are located at adjacent poles. This incoming and outgoing wire method makes the connection between branches and the connection structure between multi-phase windings simple, and the wiring copper bar used has a simple structure and a small circumferential size.

[0039] Each branch uses I-shaped sub-conductors only at the incoming and outgoing ends, and U-shaped sub-conductors are used at other locations. During the extension of the branch, cross-layers only occur in the two layers in the radial middle, namely, the second and third layers, that is, the two legs of the same U-shaped sub-conductor are inserted in the following positions: located at the first layer, or located at the fourth layer, or located at the second and third layers respectively.

[0040] In this embodiment, when both legs of the same U-shaped sub-conductor are inserted into the first layer, the span of the used U-shaped sub-conductor is 5 or 7, and the spans of the two U-shaped sub-conductors in the same pole are 5 and 7 respectively, and the two U-shaped sub-conductors form a concentric nested form. When both legs of the same U-shaped sub-conductor are inserted into the fourth layer, the span of the used U-shaped sub-conductor is 6. When the two legs of the same U-shaped sub-conductor are inserted into the second layer and the third layer respectively, the span of the used U-shaped sub-conductor is 7.

[0041] The adjacent legs of the adjacent U-shaped sub-conductors in the branch are welded together to form a welded pair. The two legs belonging to a welded pair are located at the first and second layers, or at the third and fourth layers, respectively. The span of the welded pair is 6.

[0042] By observing the slots occupied by the two branches of the same phase, it can be found that the winding slots occupied by the flat wire winding of each phase at each pole include inner slots and outer slots. The inner slots are two continuous winding slots located in the radial inner 2 layers, and the outer slots are two continuous winding slots located in the radial outer 2 layers. The inner slots and the outer slots are staggered by one slot in the circumferential direction. Figure 2 In this pole of slots 1 to 6, the inner side of the flat wire winding of this phase occupies the third and fourth layers of slots 4 and 5, and the outer side occupies the first and second layers of slots 3 and 4. The inner side occupies the outer side by one slot. This circumferential staggering of the inner side and the outer side makes the harmonic influence and torque fluctuation of the winding small during operation, thereby improving the overall NVH performance of the motor.

[0043] Second embodiment

[0044] Reference Figure 4 and Figure 5 The second embodiment of the present application is introduced. The second embodiment is a modification of the first embodiment, and components having the same or similar structures or functions as those in the first embodiment are marked with the same reference numerals, and detailed descriptions of these components are omitted.

[0045] The main difference between this embodiment and the first embodiment is that the inner and outer positions are staggered in different directions in the circumferential direction. In this embodiment, the inner position is one slot ahead of the outer position as a whole. The difference brought about by this is mainly the change in the span of the U-shaped sub-conductor located at the second and third layers. In this embodiment, when the two legs of the same U-shaped sub-conductor are inserted into the second and third layers respectively, the span of the U-shaped sub-conductor used is 5.

[0046] Third embodiment

[0047] Reference Figure 6 and Figure 7 The third embodiment of the present application is introduced. The third embodiment is a modification of the first embodiment, and components having the same or similar structures or functions as those in the first embodiment are marked with the same reference numerals, and detailed descriptions of these components are omitted.

[0048] In this embodiment, each phase includes only one branch. It is worth noting that, as described in the first embodiment, when each phase includes two branches, the two branches can be connected in series, and when the two branches are connected in series, it can also be equivalent to that the phase includes only one branch. Figure 2 , assuming that the incoming and outgoing terminals of branch A in the first embodiment are connected together, branch A and branch B are connected in series to form a branch. In such a scheme, there are many types of U-shaped sub-conductors, including same-layer conductors with a span of 5, same-layer conductors with a span of 7, cross-layer conductors with a span of 7, and same-layer conductors with a span of 6.

[0049] This embodiment is slightly different from the first embodiment in that two branches are connected in series. Figure 7 , this embodiment adjusts the winding method so that the span of the conductors on the same layer is only 7 in one place, and the rest are all 6. Among them, the conductors on the same layer with a span of 7 appear in the U-shaped sub-conductor connecting the pole where the incoming line end and the pole where the outgoing line end of the branch are located, that is, the U-shaped sub-conductor with two legs located at the first layer of the third slot and the first layer of the tenth slot in the figure respectively. In this embodiment, the spans of the two legs welded together of adjacent sub-conductors are both 6; the spans of the cross-layer U-shaped sub-conductors located in the two layers in the middle of the radial direction are both 7. In this embodiment, there are fewer types of conductors, and the same sub-conductors are arranged closely together to save space, so that the crown end has a smaller size.

[0050] It should be understood that the above-mentioned embodiments and some aspects or features thereof can be appropriately combined. For example, referring to the case in which the inner and outer positions are staggered in different directions in the circumferential direction in the second embodiment, the spans of the U-shaped sub-conductors located in the radial middle two layers in the third embodiment can also be 5. For another example, in the third embodiment, A1 and A64 can also be connected together to form a U-shaped sub-conductor, and the span of the U-shaped sub-conductor in the same layer is 5; and the connection between A32 and A33 is opened, so that A32 and A33 are provided with I-shaped sub-conductors to become the incoming and outgoing ends respectively.

[0051] Of course, the present application is not limited to the above-mentioned embodiments. Under the guidance of the present application, those skilled in the art may make various modifications to the above-mentioned embodiments of the present application without departing from the scope of the present application.

Claims

1. A stator of a flat wire motor, comprising an iron core and a flat wire winding, wherein the flat wire winding has a three-phase winding, the number of poles of the flat wire winding is 8, and the number of winding slots of the iron core is 48, characterized in that: The flat wire winding forms 4 layers in the winding slot, The winding slots occupied by the flat wire winding of each phase at each pole include: inner slots and outer slots, The inner spacers are two continuous winding grooves located in two radially inner layers, and the outer spacers are two continuous winding grooves located in two radially outer layers. The inner spacers and the outer spacers are staggered by one groove in the circumferential direction.

2. The stator of the flat wire motor according to claim 1, characterized in that: The flat wire winding of each phase includes 1 or 2 branches, each of the branches includes multiple sub-conductors, the sub-conductors include 2 I-shaped sub-conductors and multiple U-shaped sub-conductors, the two legs of the U-shaped sub-conductor are connected at one end to form a crown end, and are separated at the other end to form a welding end, and the two I-shaped sub-conductors are respectively located at the incoming end and the outgoing end of each branch.

3. The stator of the flat wire motor according to claim 2, characterized in that: The routing sequence of each branch is: Extending from the radially outermost layer to the radially innermost layer along a first direction on the circumference, and then extending from the radially innermost layer to the radially outermost layer along a second direction on the circumference opposite to the first direction, and repeating this process until the outlet end of the branch, or Extend from the radially innermost layer to the radially outermost layer along a first circumferential direction, then extend from the radially outermost layer to the radially innermost layer along a second circumferential direction opposite to the first direction, and repeat this process until the outlet end of the branch.

4. The stator of the flat wire motor according to claim 2, characterized in that: The two legs of adjacent sub-conductors welded together belong to the first layer and the second layer, and to the third layer and the fourth layer, respectively. The span of the two legs of adjacent sub-conductors welded together is 6.

5. The stator of the flat wire motor according to claim 2, characterized in that: In the two layers in the middle of the radial direction, the two legs of each U-shaped sub-conductor are located in adjacent layers, and the span of each U-shaped sub-conductor is 7 or 5. In the radially innermost layer and the radially outermost layer, the two legs of each U-shaped sub-conductor are located in the same layer.

6. The stator of the flat wire motor according to claim 5, characterized in that: The flat wire winding of each phase includes 2 branches, In the radial innermost layer, the span of each U-shaped sub-conductor is 6; in the radial outermost layer, the spans of the two U-shaped sub-conductors of each pole are 5 and 7 respectively, or In the radially outermost layer, the span of each U-shaped sub-conductor is 6; in the radially innermost layer, the spans of the two U-shaped sub-conductors of each pole are 5 and 7 respectively.

7. The stator of the flat wire motor according to claim 6, characterized in that: The two branches are connected in parallel, or the two branches are connected in series.

8. The stator of the flat wire motor according to claim 5, characterized in that: The flat wire winding of each phase includes one branch, and the incoming end and the outgoing end of the branch are located at two adjacent poles.

9. The stator of the flat wire motor according to claim 8, characterized in that: The spans of the U-shaped sub-conductors in the radially innermost layer and the radially outermost layer are 6, 5 or 7.

10. The stator of the flat wire motor according to claim 8, characterized in that: The situation where the span of the radially innermost and radially outermost U-shaped sub-conductors is 5 or 7 only occurs at one place in the entire branch, which is located at the two poles where the U-shaped sub-conductors connect the incoming and outgoing terminals.

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