A segmented elevator traction motor with phase decoupling

Abstract

This utility model relates to a decoupled, segmented elevator traction motor, including a motor stator and a motor rotor. The motor stator comprises several stator modules, and a magnetic isolation shield is provided between adjacent stator modules. The magnetic isolation shield includes a low-permeability part near the motor rotor and a high-permeability part away from the motor rotor. The high-permeability part is made of a high-permeability material, and the low-permeability part is made of a low-permeability material or a non-magnetic insulating material. Furthermore, the permeability of the low-permeability part is less than that of the high-permeability part. This decoupled, segmented elevator traction motor provides good magnetic isolation with its magnetic isolation shield.

Description

Technical Field

[0001] This utility model relates to an electric motor, and more particularly to a segmented elevator traction motor with phase decoupling. Background Technology

[0002] With the development of machine-room-less and gearless elevator technology, permanent magnet synchronous motors have been widely used due to their advantages such as small size, fast response, and high efficiency. However, traditional stator-concentrated winding motors, due to their smaller number of stator slots, are prone to generating more electromagnetic harmonics, leading to significant torque pulsation during operation. This poses a certain threat to the stable operation of the elevator traction system. For elevator traction systems, high stability and low torque pulsation are especially crucial at low speeds; otherwise, periodic impacts can occur, affecting the elevator's ride comfort and bearing lifespan.

[0003] To address the aforementioned issues, existing technologies often employ stator skewed slots or rotor skewed poles to reduce cogging torque. However, these methods not only increase the complexity of motor manufacturing processes but also increase magnetic leakage or reduce the motor's slot fill factor. Another approach is multiphase winding distribution design. The scheme disclosed in CN108880046A embeds two sets of three-phase windings with a 30° phase difference within the same stator slot, which can eliminate the 5th and 7th harmonic components, increasing the torque ripple frequency and reducing its amplitude, thereby reducing vibration and noise. However, while dual-winding and multiphase drives can solve the aforementioned problems to some extent, the lack of magnetic isolation between their windings makes them prone to interference between adjacent phases. A failure in one phase can easily lead to the failure of the entire motor.

[0004] In addition, to disperse magnetic flux disturbances, some solutions divide the stator core into multiple modules and set up magnetic isolation structures between the modules. The patent solution disclosed in CN110190689A targets a direct-drive motor for a belt conveyor, setting epoxy isolation plates between the inner stator modules and offsetting adjacent modules at a certain angle in the winding installation. This segmented, staggered method combined with magnetic isolation materials can suppress low-speed torque pulsation to some extent, but its magnetic isolation effect and structural form still have room for improvement.

[0005] In summary, the existing technology still lacks a magnetic circuit scheme that is simple in structure yet can effectively isolate the magnetic flux coupling of the stator module and further reduce torque ripple. Summary of the Invention

[0006] To solve the above-mentioned technical problems, this utility model provides a segmented elevator traction motor with phase decoupling, wherein magnetic isolation shielding is provided between adjacent stator modules and the magnetic isolation effect is good.

[0007] The present invention discloses a segmented elevator traction motor with phase decoupling, comprising a motor stator and a motor rotor. The motor stator comprises several stator modules, and a magnetic isolation shield is provided between adjacent stator modules. The magnetic isolation shield includes a low magnetic permeability part near the motor rotor and a high magnetic permeability part away from the motor rotor. The high magnetic permeability part is made of a high magnetic permeability material, and the low magnetic permeability part is made of a low magnetic permeability material or a non-magnetic insulating material. Furthermore, the magnetic permeability of the low magnetic permeability part is less than the magnetic permeability of the high magnetic permeability part.

[0008] The advantage of this decoupled, segmented elevator traction motor lies in the presence of magnetic isolation shields between adjacent stator modules. These shields consist of a high-permeability section away from the rotor and a low-permeability section closer to the rotor. This magnetic isolation shielding primarily diverts magnetic flux through the shield to the high-permeability section, while the low-permeability section effectively blocks leakage flux. This isolates magnetic flux disturbances between adjacent stator modules and significantly suppresses torque pulsations caused by magnetic flux coupling. Furthermore, when any phase winding fails, the abnormal magnetic field generated by the faulty phase reduces electromagnetic interference to the healthy phase windings to a negligible level, ensuring excellent fault isolation capabilities.

[0009] Furthermore, the segmented elevator traction motor of this utility model with phase decoupling includes six sets of stator modules evenly distributed along the circumferential direction.

[0010] The six sets of stator modules, evenly distributed along the circumference, can further suppress the torque pulsation of the motor and improve the stability of motor operation.

[0011] Furthermore, in the segmented elevator traction motor with phase decoupling of this utility model, the stator module includes a sector-shaped iron core on which stator coils are wound.

[0012] The fan-shaped iron core facilitates the combined installation of adjacent stator modules and magnetic isolation shielding components.

[0013] Furthermore, in the segmented elevator traction motor with phase decoupling of this utility model, the magnetic isolation shield is wedge-shaped, and the wedge-shaped magnetic isolation shield is disposed between adjacent sector iron cores and tightly fitted to the end face of the adjacent sector iron cores.

[0014] The wedge-shaped magnetic isolation shield facilitates its compatibility with the sector-shaped iron core.

[0015] Furthermore, in the segmented elevator traction motor of this utility model with phase decoupling, the high-permeability magnetic part is a high-permeability soft magnetic material.

[0016] The high-permeability part made of high-permeability soft magnetic material can achieve efficient conduction of leakage magnetic field, which can not only prevent it from causing electromagnetic interference to adjacent phases, thereby further improving the motor performance, but also prevent it from becoming magnetized and interfering with the motor's operating magnetic field.

[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the following describes the embodiments of this utility model in detail. Attached Figure Description

[0018] Figure 1 This is the front view of a segmented elevator traction motor with phase decoupling.

[0019] Figure 2 This is a structural schematic diagram of the stator module.

[0020] Figure 3 This is a cross-sectional view of a magnetically shielded component.

[0021] Figure 4 This is a schematic diagram of the mutual inductance and self-inductance of each phase of a segmented elevator traction motor with phase decoupling.

[0022] Figure 5 This is a schematic diagram of the torque waveform of a segmented elevator traction motor with phase decoupling.

[0023] In the figure, the motor rotor is 1, the stator module is 2, the magnetic isolation shield is 3, the low magnetic permeability part is 4, and the high magnetic permeability part is 5. Detailed Implementation

[0024] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0025] Example 1: See Figures 1 to 5 The segmented elevator traction motor with phase decoupling in this embodiment includes a motor stator and a motor rotor 1. The motor stator includes several stator modules 2. A magnetic isolation shield 3 is provided between adjacent stator modules. The magnetic isolation shield includes a low magnetic permeability part 4 near the motor rotor and a high magnetic permeability part 5 away from the motor rotor. The high magnetic permeability part is made of a high magnetic permeability material, and the low magnetic permeability part is made of a low magnetic permeability material or a non-magnetic insulating material. The magnetic permeability of the low magnetic permeability part is less than the magnetic permeability of the high magnetic permeability part.

[0026] The advantage of this decoupled, segmented elevator traction motor lies in the presence of magnetic isolation shields between adjacent stator modules. These shields consist of a high-permeability section away from the rotor and a low-permeability section closer to the rotor. This magnetic isolation shielding primarily diverts magnetic flux through the shield to the high-permeability section, while the low-permeability section effectively blocks leakage flux. This isolates magnetic flux disturbances between adjacent stator modules and significantly suppresses torque pulsations caused by magnetic flux coupling. Furthermore, when any phase winding fails, the abnormal magnetic field generated by the faulty phase reduces electromagnetic interference to the healthy phase windings to a negligible level, ensuring excellent fault isolation capabilities.

[0027] In this magnetically isolated shielding component, the high-permeability part provides a low-reluctance path, which can directionally divert the leakage magnetic field of the motor and confine it to a preset path, thereby effectively preventing the disorderly diffusion of the magnetic field. If the shielding component as a whole uses conventional low-permeability materials for magnetic isolation, the magnetic field cannot be effectively guided due to excessively high reluctance. This will cause leakage magnetic field to bypass and penetrate adjacent phase regions or cause local magnetic saturation, thus rendering the shielding function ineffective. In this segmented elevator traction motor with phase decoupling, the high-permeability part and the low-permeability part work together. The former serves as a concentrated magnetic field diversion channel, while the latter forms a high-reluctance isolation zone between adjacent phases to block lateral magnetic flux. Together, they ensure that abnormal magnetic fields are discharged in a closed loop along a preset axial path, avoiding conduction to adjacent phases, thereby achieving efficient magnetic isolation and electromagnetic compatibility.

[0028] Preferably, the motor stator includes six sets of stator modules evenly distributed along the circumference.

[0029] The six sets of stator modules, evenly distributed along the circumference, can further suppress the torque pulsation of the motor and improve the stability of motor operation.

[0030] Specifically, assuming the rotor has a total of 10 pole pairs and each pole occupies a mechanical angle of 18°, and each phase stator module has 6 stator slots, with the 6 stator modules evenly distributed along the circumference and sequentially labeled as the first to the sixth stator module, the mechanical angle misalignment between adjacent stator modules is 60°. This allows the torque ripples of the first to third stator modules to cancel each other out, and the torque ripples of the fourth to sixth stator modules to cancel each other out, thus effectively suppressing the motor's torque ripple.

[0031] Preferably, the stator module includes a sector-shaped iron core on which stator coils are wound.

[0032] The fan-shaped iron core facilitates the combined installation of adjacent stator modules and magnetic isolation shielding components.

[0033] In this embodiment, the sector-shaped iron core of each stator module is made of stamped silicon steel sheets stacked together, and stator coils are wound in its slots.

[0034] Preferably, the magnetic isolation shield is wedge-shaped, and the wedge-shaped magnetic isolation shield is disposed between adjacent sector cores and closely fits the end face of the adjacent sector cores.

[0035] The wedge-shaped magnetic isolation shield facilitates its compatibility with the sector-shaped iron core.

[0036] Specifically, from a radial cross-section perspective, the magnetic isolation shield is wedge-shaped, wider at the top and narrower at the bottom, with one side tightly attached to the end face of the stator module and the other side tightly attached to the end face of another stator module.

[0037] Because low-permeability magnetic components made of low-permeability material are incorporated into the wedges between stator modules, the magnetic flux that directly closes across modules is effectively blocked, reducing magnetic flux coupling between adjacent stator modules. This results in the self-inductance of the entire motor being much greater than its mutual inductance (e.g., ...). Figure 4 This means that when any phase winding of the motor fails, the electromagnetic interference of the abnormal magnetic field generated by the faulty phase on the healthy phase winding can be reduced to a negligible range, thereby ensuring that the system has excellent fault isolation capability.

[0038] Preferably, the high-permeability part is a high-permeability soft magnetic material.

[0039] The high-permeability part made of high-permeability soft magnetic material can achieve efficient conduction of leakage magnetic field, which can not only prevent it from causing electromagnetic interference to adjacent phases, thereby further improving the motor performance, but also prevent it from becoming magnetized and interfering with the motor's operating magnetic field.

[0040] In this embodiment, the high-permeability part of the magnetic isolation shield is made of a high-permeability soft magnetic material, such as iron powder or ferrite composite, with a permeability of tens to hundreds; the low-permeability part is made of a low-permeability material or a non-magnetic insulating material, such as epoxy resin or glass fiber composite material, with a permeability of approximately 1 to 5. In practice, the windings of each phase stator module are first wound and insulated during manufacturing and wiring, and then the cores of adjacent stator modules are assembled together using bolts. During installation, the magnetic isolation shield is inserted between adjacent sections, and after tightening, the magnetic isolation shield is tightly attached to the edge of the fan-shaped core. Operational results show that this structure effectively weakens the coupling path of magnetic flux between stator modules, making the magnetic field disturbances of each section relatively independent, and significantly reducing torque pulsation of the motor throughout the entire speed range.

[0041] In summary, the decoupled segmented elevator traction motor of this invention partially isolates the magnetic flux paths of each stator module, achieving dispersion and mutual cancellation of magnetic field disturbances in each stator module. The motor's torque harmonic order is increased while its amplitude is reduced, significantly weakening torque pulsation. Simulation analysis shows that the decoupled segmented elevator traction motor of this invention, where the magnetic flux of each stator module is mainly closed within its own rotor path, significantly suppresses mutual induction and torque pulsation caused by magnetic coupling between modules. Through structural innovation, it avoids adding extra windings or complex control; relying solely on the optimization of the magnetic circuit and geometric layout, it achieves phase decoupling and low torque pulsation.

[0042] The embodiments are only for illustrating the principle of this utility model and its application effects. The specific structure can be transformed equivalently according to actual requirements without departing from the protection scope of this utility model.

[0043] The above description is merely a preferred embodiment of this utility model, used to assist those skilled in the art in implementing the corresponding technical solutions, and is not intended to limit the scope of protection of this utility model. The scope of protection of this utility model is defined by the appended claims. It should be noted that, for those skilled in the art, several equivalent improvements and modifications can be made based on the technical solutions of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Furthermore, it should be understood that although this specification describes the embodiments as described above, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions of each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A segmented elevator traction machine with decoupled phases, comprising a machine stator and a machine rotor (1), the machine stator comprising a number of stator modules (2), characterised in that: A magnetic isolation shield (3) is provided between adjacent stator modules. The magnetic isolation shield includes a low magnetic permeability part (4) near the motor rotor and a high magnetic permeability part (5) away from the motor rotor. The high magnetic permeability part is made of a high magnetic permeability material, and the low magnetic permeability part is made of a low magnetic permeability material or a non-magnetic insulating material. The magnetic permeability of the low magnetic permeability part is less than the magnetic permeability of the high magnetic permeability part.

2. The individually decoupled segmented elevator traction machine of claim 1, wherein: The motor stator comprises six sets of stator modules evenly distributed along the circumference.

3. The individually decoupled segmented elevator traction machine of claim 1, wherein: The stator module includes a sector-shaped iron core, on which stator coils are wound.

4. The individually decoupled segmented elevator traction machine of claim 3, wherein: The magnetic isolation shield is wedge-shaped, and the wedge-shaped magnetic isolation shield is disposed between adjacent sector-shaped iron cores and is tightly fitted to the end face of the adjacent sector-shaped iron cores.

5. The individually decoupled segmented elevator traction machine of claim 1, wherein: The high-permeability part is a high-permeability soft magnetic material.

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