A double-layer wave-wound component lobe stator structure and its motor

Abstract

This invention discloses a double-layer wave-wound segmented stator structure, composed of multiple segmented stator cores. Each segmented stator core has coils embedded in slots spaced apart along its circumference. The coils employ a double-layer wave-wound configuration. By adjusting the coil span between adjacent module slots, coils are prevented from bridging between two modules. The motor is designed with double-sided leads, and a parallel connector is used to complete the wave-wound coil connection. A motor model is also disclosed. This invention achieves electrical independence between the winding modules of the segmented motor, eliminating cross-coupling and inter-pole connections. Each module can be individually processed, impregnated, and transported to the final installation location for assembly, 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 stator structure of a double-layer wave winding motor 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 wave-wound component-lobe stator structure that enables each module of the stator to operate independently without interference.

[0006] The technical solution adopted by this invention to solve its technical problem is: a double-layer wave-wound segmented stator structure, which is spliced ​​from multiple segmented stator cores. Each segmented stator core has a coil embedded in a slot spaced along the circumference. The coil adopts a double-layer wave-wound type. The first pitch of the wave-wound coil is defined as y1, and the second pitch is y2. The upper side coil in the first y1 slots of a single stator core has its upper side lead-out end pitch decreasing by 0.5 slots. The lower side uses a strip coil, and its nose end pitch decreases by 0.5 slots. The lower side coil in the last y1 slots of the stator core has its lower side lead-out end pitch decreasing by 0.5 slots. The upper side uses a strip coil, and its nose end pitch decreases by 0.5 slots. Wave-wound coils with a pitch of y1 + y2 are embedded in the remaining slots.

[0007] The aforementioned double-layer wave winding segmented stator structure uses a parallel head sleeve to complete the winding connection with double-sided outgoing wires after the coil is installed.

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

[0009] The aforementioned double-layer wave winding 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 as follows: The segmented stator double-layer wave winding structure of the present invention includes conventional wave winding coils, variable span wave winding coils, and variable span wave winding strip coils. Each module winding is electrically independent and has no cross coupling. Therefore, each segmented stator can be processed, impregnated and transported to the final installation location 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 3-7 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] The present invention discloses a double-layer wave winding structure for a segmented motor stator, as follows: Figure 1 As shown, the stator is composed of multiple segmented stator cores 3, each segment having a coil embedded in a circumferentially spaced slot. The coils employ a double-layer wave winding configuration. The modular windings maintain electrical independence while remaining structurally consistent and interchangeable. The first pitch of the wave winding coil is defined as y1, and the second pitch as y2. For the upper-layer side coils in the first y1 slots of a single stator core 3, the pitch at the upper-layer side output end decreases by 0.5 slots sequentially. The lower-layer side uses a strip coil, with its nose-end pitch decreasing by 0.5 slots sequentially. Similarly, for the lower-layer side coils in the last y1 slots of the stator core 3, the pitch at the lower-layer output end decreases by 0.5 slots sequentially. The upper-layer side uses a strip coil, with its nose-end pitch decreasing by 0.5 slots sequentially. Figure 1The diagram shows a normal span coil 1 and a variable span coil 2. The remaining slots contain conventional wave winding coils with a pitch of y1 + y2. After the coils are installed, the windings are connected by a parallel head sleeve with double-sided leads. 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 number is represented by the slot number. Figure 2 The six coils in slots 7-12 shown are conventional wave winding coils, with a first pitch y1=6 and a second pitch y2=6. Figure 3 As shown. Slots 1 to 6 are the upper-layer side-variable span-wave winding coils. The span from their lead-out end to the straight end decreases by 0.5 slots sequentially to ensure that the coil side does not affect the stator core assembly. Figure 4 As shown. Slots 13 to 18 are the lower-layer side-variable span-wave winding coils, with the span from their output end to the straight end decreasing by 0.5 slots sequentially, as shown. Figure 5 As shown. The upper edge of slots 19-24 uses strip coils, with the span from the nose to the straight end of the upper edge decreasing by 0.5 slots each time. Figure 6 As shown, the lower edge of slots 1 to 6 uses strip coils, and the span from the nose to the straight end of the lower edge decreases by 0.5 slots in succession. Figure 7 As shown. After the coil is inserted, the winding is connected using a parallel head sleeve, with wires exiting from both sides. Compared with the double-layer lap winding structure, this reduces the number of inter-pole connections.

[0019] Compared to the background technology, the wave winding structure provided by this invention can achieve modular winding, has a simple process and will not cause a decrease in motor performance, and can be widely used in the field of segmented 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 wave-wound component-lobe stator structure, characterized in that: It is composed of multiple segmented stator cores (3) spliced ​​together. Each segmented stator core (3) has a coil embedded in the slots spaced apart along the circumference. The coil adopts a double-layer wave winding type. The first pitch of the wave winding coil is defined as y1 and the second pitch is y2. The upper side coil in the first y1 slots of a single stator core (3) has its upper side output end pitch reduced by 0.5 slots in turn. The lower side adopts a strip coil, and its nose end pitch is reduced by 0.5 slots in turn. The lower side coil in the last y1 slots of the stator core (3) has its lower side output end pitch reduced by 0.5 slots in turn. The upper side adopts a strip coil, and its nose end pitch is reduced by 0.5 slots in turn. The remaining slots are filled with wave winding coils with a pitch of y1+y2. After the coil is installed, the winding connection is completed by using a parallel head sleeve to achieve double-sided output. The windings of each module remain 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 wave winding segmented stator structure as described in claim 1, and uses double-sided lead-out and poleless inter-connection of windings.

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