A double-layer cascaded component-lobe stator structure and its motor

Abstract

This invention discloses a double-layer lap-wound segmented stator structure, composed of multiple segmented stator cores spliced ​​together. Each segmented stator core has coils embedded in slots spaced apart along its circumference. The coils employ a double-layer lap-wound configuration. By adjusting the span between the coil output terminals in adjacent module slots, coils are prevented from bridging between two modules. A motor is also disclosed. This invention achieves electrical independence between the winding modules of the segmented motor, eliminating cross-coupling. Each module can be individually processed, impregnated, and transported to the final installation location for splicing, thereby reducing the manufacturing difficulty and transportation costs of the motor.

Description

Technical Field

[0001] This invention belongs to the field of electrical engineering technology, and specifically relates to a segmented motor stator structure with double-layer lap windings and the motor thereof. Background Technology

[0002] In direct-drive or semi-direct-drive applications such as wind power generation and ship propulsion, the single-unit capacity of motors is on the rise, and their size and weight are also increasing significantly, posing great challenges to manufacturing, processing and transportation.

[0003] Segmented design is an effective way to solve the above problems. Usually, the segmentation of the rotor only needs to consider the structural influence, while the segmentation of the stator needs to take into account both structural and electrical factors, which is the difficulty of modular motors.

[0004] Currently, a common design scheme for stator modularization is the concentrated fractional slot scheme, where the coil span is designed to be 1, allowing it to be directly wound on the teeth. Each tooth is a module, thus achieving no cross-coupling between modules. The disadvantage is that the magnetomotive force of the concentrated fractional slot winding contains abundant low-order harmonics, which increases the eddy current loss of the permanent magnet and deteriorates the vibration and noise performance of the motor. Another scheme is the empty slot structure, where the winding span is usually greater than 1, and several empty slots are set between each module without embedding coils. The disadvantage is that the effective number of slots in the motor is reduced, and the torque density decreases. Summary of the Invention

[0005] One of the objectives of this invention is to address the shortcomings of existing technologies by providing a double-layer cascaded winding segmented stator structure that enables each stator module to operate independently without interfering with the others.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: a double-layer lap-wound segmented stator structure, which is composed of multiple segmented stator cores spliced ​​together. Each segmented stator core has a coil embedded in a slot spaced along the circumference. The coil adopts a double-layer lap-wound type. The pitch of the lap-wound coil is defined as y. The pitch of the lower side coil output end in the first y slots of a single stator core decreases by 0.5 slot, 1 slot, 1.5 slot...0.5y slot in sequence. The pitch of the upper side coil output end in the last y slots of the stator core decreases by 0.5 slot, 1 slot, 1.5 slot...0.5y slot in sequence. Conventional lap-wound coils with a pitch of y are placed in the remaining slots. After the coil is installed, the inter-pole connection is completed by welding.

[0007] The double-layer lapped segmented stator structure described above can have its upper edge in the first y-slot and its lower edge in the last y-slot welded together, connected by a busbar, or directly wound into a coil.

[0008] The aforementioned double-layer lapped segmented stator structure has modular windings that remain electrically independent and structurally consistent, allowing for interchangeability.

[0009] The aforementioned double-layer lapped segmented stator structure has winding ends that do not extend beyond the outer edge of the stator core, thus ensuring no interference between the winding modules.

[0010] The second objective of this invention is to provide a motor with a segmented stator double-layer lap winding structure. The stator adopts the above-mentioned segmented structure to achieve modular design and uses double-sided lead-out and poleless inter-winding connection.

[0011] The beneficial effects of the present invention are: the double-layer lapped winding segmented stator structure of the present invention has electrical independence between each module winding and no cross coupling. Therefore, each segmented stator can be processed, impregnated and transported to the final installation site for splicing, thereby reducing the manufacturing difficulty and transportation cost of the motor. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention;

[0013] Figure 2 This is a winding connection diagram according to an embodiment of the present invention;

[0014] Figures 3-4 This is a schematic diagram of the winding structure for an embodiment.

[0015] The labels for each figure are: 1—normal span coil, 2—variable span coil, 3—stator core. Detailed Implementation

[0016] The specific embodiments of the present invention will now be described in conjunction with the accompanying drawings and examples to enable those skilled in the art to better understand the present invention. Example 1

[0017] This invention discloses a double-layer lap-wound component-lobe stator structure and its motor, such as... Figure 1 As shown, it is composed of multiple segmented stator cores 3 spliced ​​together. Each segment of stator core 3 has a coil embedded in a slot spaced along the circumference. The coil adopts a double-layer lap winding type. The modular windings are electrically independent and structurally consistent, allowing for interchangeability. The pitch of the lap winding coil is defined as y. This pitch is usually determined by the designer and can be a full pitch or a short pitch. The pitch of the lower side coil output end in the first y slots of a single stator core 3 decreases sequentially by 0.5 slot, 1 slot, 1.5 slot...0.5y slot, and the pitch of the upper side coil output end in the last y slots of the stator core 3 decreases sequentially by 0.5 slot, 1 slot, 1.5 slot...0.5y slot, as shown. Figure 1The diagram shows a normal span coil 1 and a variable span coil 2. Conventional lapped winding coils with a pitch of y are placed in the remaining slots. After the coils are installed, the inter-pole connections are completed by welding. The upper edge of the first y-slot and the lower edge of the last y-slot can be welded, connected by a busbar, or directly wound into coils. The winding ends do not extend beyond the outer edge of the stator core 3, so there is no interference between the windings of each module. Example 2

[0018] This embodiment is based on a modular motor with 6 phases, 16 poles, 96 slots, and divided into 4 segments circumferentially. Each segment of the motor has 24 slots, including 24 coils. The coil numbers are indicated by the slot numbers. Figure 2 The 18 coils in slots 1-18 shown are conventional lap-wound coils with a coil pitch y=6. Figure 3 As shown. The lower layer coils in slots 1-6 are variable-spacing strip coils, with the lower edge decreasing by 0.5 slots towards the straight section. The upper layer coils in slots 19-24 are also variable-spacing strip coils, with the upper edge decreasing by 0.5 slots towards the straight section. Figure 4 As shown. Finally, the coil sides 1-19, 2-20, 3-21, 4-22, 5-23, and 6-24 will be connected in sequence. The connection method can be to weld the corresponding coil turns or connect them with busbars, or the corresponding coil sides can be directly wound into complete coils for embedding.

[0019] Compared to the background technology, the lap winding structure provided by this invention can realize winding modularization without causing a decrease in motor performance, and can be widely used in the field of split motors.

[0020] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A double-layer stacked segmented stator structure, composed of multiple segmented stator cores (3) spliced ​​together, characterized in that: Each stator core (3) has a coil embedded in a circumferentially spaced slot. The coil adopts a double-layer lap winding type. The pitch of the lap winding coil is defined as y. The pitch of the lower side coil output end in the first y slots of a single stator core (3) decreases by 0.5 slot, 1 slot, 1.5 slot...0.5y slot in sequence. The pitch of the upper side coil output end in the last y slots of the stator core (3) decreases by 0.5 slot, 1 slot, 1.5 slot...0.5y slot in sequence. The remaining slots are filled with lap winding coils with a pitch of y. After the coil is installed, the pole connection is completed by welding. The upper side in the first y slot and the lower side in the last y slot are welded, or connected by busbar, or directly wound into coils. Each module winding is electrically independent and structurally consistent. The winding ends do not exceed the outer edge of the stator core (3).

2. An electric motor, comprising a stator and a rotor, characterized in that, The stator adopts the double-layer lapped winding segmented stator structure as described in claim 1, and uses double-sided lead-out and poleless inter-branch connection.

Images