Multi-element stator winding, multi-element stator assembly and multi-element motor

Abstract

The utility model relates to the technical field of motors, in particular to a multi-element stator winding, a multi-element stator assembly and a multi-element motor, and aims to solve the problem that motor units of the existing multi-element motor influence each other. The multi-element stator winding provided by the utility model comprises a multi-element stator iron core and a multi-element winding, the multi-element stator core comprises a plurality of magnetic shielding layers, and the magnetic shielding layers divide the multi-element stator core into a plurality of core sections along the radial direction of the motor; the multi-element winding comprises a plurality of coil windings, and the coil windings are arranged on the iron core sections in a sleeving mode. According to the multi-element stator winding provided by the utility model, the multi-element stator iron core is divided into the plurality of iron core sections through the magnetic shielding layer, each iron core section is wound with one coil winding to form one winding unit, and the plurality of winding units arranged around the axis of the motor form one motor unit. Therefore, mutual influence of coil windings belonging to different motor units on the same stator core during simultaneous working is avoided through magnetic shielding.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a multi-element stator winding, a multi-element stator assembly and a multi-element motor. Background Art

[0002] Existing multi-element motors can flexibly adjust power by combining and superimposing multiple independently running motor units distributed along the motor axis, thereby adjusting their own rated power according to the motor load, so that the motor load rate runs at the current rated power, and the motor efficiency is always maintained between 95% and 99%, achieving the purpose of high efficiency and energy saving. However, since multiple windings are wound on a stator core and the same-phase windings of each independently running motor unit are connected in series, filtering is required during operation to avoid interference. At the same time, when multiple windings belonging to different motor units are set on a stator core, when one winding is energized, other windings on the stator core will also be induced. During operation, they will interfere with each other and form negative pulses, which will cause the second motor to start slowly or even fail to start. Utility Model Content

[0003] The utility model aims to provide a multi-element stator winding, a multi-element stator assembly and a multi-element motor, so as to solve the problem of mutual influence between motor units of the existing multi-element motor.

[0004] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0005] A multi-element stator winding comprises a multi-element stator core and a multi-element winding;

[0006] The multi-element stator core comprises a plurality of magnetic shielding layers, and the magnetic shielding layers divide the multi-element stator core into a plurality of core segments along the radial direction of the motor;

[0007] The multi-element winding includes a plurality of coil windings, and the coil windings are sleeved on the core segment.

[0008] Furthermore, the core segment and the magnetic shielding layer are connected by bonding.

[0009] Furthermore, the core segment and the magnetic shielding layer are bonded with epoxy adhesive.

[0010] Furthermore, the magnetic shielding layer is made of aluminum, copper, nickel alloy, ferrite, stainless steel, chromium aluminum alloy, manganese, nickel, tungsten or iron-nickel-aluminum alloy.

[0011] Furthermore, the core segment and the magnetic shielding layer are both multi-layer structures, each layer is arranged along the radial direction of the motor and adjacent layers are bonded and connected.

[0012] Furthermore, the magnetic shielding layer includes at least two layers, and adjacent layers are bonded with epoxy adhesive.

[0013] Furthermore, the coil windings are not conductive with each other and are arranged along the radial direction of the motor;

[0014] The coil windings are sleeved on the core segments and correspond one-to-one with the core segments to form winding units, and each of the winding units is arranged along the radial direction of the motor.

[0015] Furthermore, the magnetic shielding layer is provided with a connecting protrusion, and the connecting protrusion is connected to the core segment, so that the magnetic shielding layer and the core segment form a receiving gap;

[0016] The accommodating gap is used to accommodate the conductive wire of the coil winding.

[0017] In another aspect of the utility model, a multi-element stator assembly is provided, comprising the multi-element stator winding described above, and also comprising a stator housing, wherein a plurality of the multi-element stator windings are installed in the stator housing and are evenly distributed around the axis of the stator housing;

[0018] The coil winding is sleeved on the core segment and corresponds to the core segment one by one to form a winding unit, and each of the winding units is arranged along the radial direction of the motor;

[0019] The winding units at the same radial position of the motor are arranged around the motor axis to form a motor unit, and a plurality of the motor units are nested in layers;

[0020] The rated powers of the motor units are the same or different.

[0021] A third aspect of the present invention provides a multi-element motor, comprising the multi-element stator assembly mentioned above.

[0022] Based on the above technical solutions, the technical effects that can be achieved by the utility model are:

[0023] The multi-element stator winding provided by the utility model comprises a multi-element stator core and a multi-element winding; the multi-element stator core comprises a plurality of magnetic shielding layers, which divide the multi-element stator core into a plurality of core segments along the radial direction of the motor; the multi-element winding comprises a plurality of coil windings, which are sleeved on the core segments.

[0024] The multi-element stator winding provided by the utility model divides the multi-element stator core into multiple core segments through a magnetic shielding layer, and a coil winding is wound on each core segment to form a winding unit, and multiple winding units arranged around the motor axis form a motor unit. That is, the conventional stator winding consisting of one core and one coil is divided into multiple segments arranged along the radial direction of the motor through a magnetic shielding layer, and each segment is wound with a coil. Through the shielding effect of the magnetic shielding layer, the coil windings belonging to different motor units on the same stator core are prevented from influencing each other when working at the same time, so that each motor unit can start normally without mutual interference, negative pulses, etc., and at this time, there is no need to add an interference pulse elimination circuit in the driver switching algorithm. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A cross-sectional schematic diagram of a multi-element stator winding provided in an embodiment of the utility model;

[0027] Figure 2 It is a structural schematic diagram of a multi-element stator core;

[0028] Figure 3 It is a structural schematic diagram of the magnetic shielding layer;

[0029] Figure 4 Another structural diagram of the multi-element stator core

[0030] Figure 5 It is a schematic diagram of the coordination between the magnetic shielding layer and the core segment;

[0031] Figure 6 This is the front view of the coordination between the magnetic shielding layer and the core segment.

[0032] Icons: 100, multi-element stator core; 110, magnetic shielding layer; 111, connecting protrusion; 120, core segment; 101, accommodation gap; 200, multi-element winding; 210, coil winding. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0036] In an existing multi-element motor, multiple windings belonging to different motor units are arranged on one stator core. When one winding is energized, other windings on the stator core will also be induced. During operation, they will interfere with each other and form negative pulses, causing the second motor to start slowly or even fail to start.

[0037] In view of this, the multi-element stator winding provided by the utility model includes a multi-element stator core 100 and a multi-element winding 200; the multi-element stator core 100 includes a plurality of magnetic shielding layers 110, and the magnetic shielding layers 110 divide the multi-element stator core 100 into a plurality of core segments 120 along the radial direction of the motor; the multi-element winding 200 includes a plurality of coil windings 210, and the coil windings 210 are sleeved on the core segments 120.

[0038] The multi-element stator winding provided by the utility model divides the multi-element stator core 100 into multiple core segments 120 through the magnetic shielding layer 110, and a coil winding 210 is wound on each core segment 120 to form a winding unit, and multiple winding units arranged around the motor axis form a motor unit. That is, the conventional stator winding consisting of one core and one coil is divided into multiple segments arranged along the radial direction of the motor through the magnetic shielding layer 110, and each segment is wound with a coil. Through the shielding effect of the magnetic shielding layer 110, the coil windings 210 belonging to different motor units on the same stator core are prevented from influencing each other when working at the same time, so that each motor unit can start normally without mutual interference, negative pulses, etc., and at this time, there is no need to add an interference pulse elimination circuit in the driver switching algorithm.

[0039] The following combination Figure 1-Figure 6The structure and shape of the multi-element stator winding provided in this embodiment are described in detail:

[0040] In this embodiment, the multi-element stator core 100 includes at least one magnetic shielding layer 110, and the magnetic shielding layer 110 divides the multi-element stator core 100 into a plurality of core segments 120 along the radial direction of the motor. Figure 1 , Figure 2 As shown. The multi-element winding 200 includes a plurality of coil windings 210, which are sleeved on the core segments 120 and the coil windings 210 correspond to the core segments 120 one by one. That is, the multi-element stator core 100 includes core segments 120 and magnetic shielding layers 110 which are arranged along the radial direction of the motor and are alternately connected in sequence, and the core segments 120 and the corresponding sleeved coil windings 210 form a winding unit.

[0041] Specifically, the magnetic shielding layer 110 and the core segment 120 are bonded together using epoxy adhesive.

[0042] In this embodiment, in order to reduce eddy current loss, the core segment 120 and the magnetic shielding layer 110 are both multi-layer structures, that is, along the radial direction of the motor, the core segment 120 and the magnetic shielding layer 110 are both composed of multiple layers, and the adjacent layers are bonded with epoxy glue. The magnetic shielding layer 110 can effectively reduce the generation of eddy current to eliminate mutual interference between the various motor units. Specifically, each layer is an I-shaped structure, such as Figure 2 shown.

[0043] In this embodiment, the magnetic shielding layer 110 can be made of metal materials such as aluminum, copper, nickel alloy, ferrite, stainless steel, chromium aluminum alloy, manganese, nickel, tungsten or iron-nickel-aluminum alloy. It should be noted that other materials can be selected while ensuring the magnetic shielding effect, self-strength and high temperature resistance. Among them, stainless steel has a large internal resistance and can effectively prevent the generation of eddy currents. In this embodiment, the magnetic shielding layer 110 adopts the method of bonding two metal layers with epoxy glue in the middle to achieve a good magnetic shielding effect.

[0044] In this embodiment, the coil winding 210 is wound with a wire having a circular or rectangular cross section and pressed into a rectangular cross section, thereby further improving the winding density to increase the full slot rate and reduce resistance and eddy current loss.

[0045] In this embodiment, Figure 1As shown, the multi-element stator core 100 includes five core segments 120 and four magnetic shielding layers 110. A corresponding coil winding 210 is wound around each core segment 120, thereby forming a winding unit with the coil winding 210. That is, a multi-element stator winding is provided with a plurality of winding units arranged along the radial direction of the motor. It should be noted that the coil windings 210 on a multi-element stator winding are not conductive and are arranged along the radial direction of the motor. Since the core segment 120 is wound with the coil winding 210, there is an accommodation gap 101 between the core segment 120 and the magnetic shielding layer 110 to leave space for winding the coil winding 210, and the core segment 120 and the magnetic shielding layer 110 are bonded by epoxy glue.

[0046] Specifically, in order to prevent the coil winding 210 from being squeezed, the magnetic shielding layer 110 is provided with a connecting protrusion 111, such as Figure 3 As shown, the connecting protrusion 111 abuts against the core segment 120, so that the magnetic shielding layer 110 and the core segment 120 form a receiving gap 101, and the receiving gap 101 is used to receive the coil winding 210. Figure 4 , Figure 5 , Figure 6 shown.

[0047] In this embodiment, the matching structure of the core segment 120 and the magnetic shielding layer 110 is as follows: Figure 5 , Figure 6 As shown, a magnetic shielding layer 110 is disposed between two core segments 120 , and the magnetic shielding layer 110 and the core segments 120 form a rectangular receiving gap 101 .

[0048] In this embodiment, the number of winding units in a multi-element stator winding is selected according to needs.

[0049] Based on the multi-element stator winding provided in this embodiment, a multi-element stator assembly is proposed, including the multi-element stator winding mentioned above and a stator housing, wherein a plurality of multi-element stator windings are installed in the stator housing and evenly distributed around the axis of the stator housing.

[0050] Specifically, the multi-element stator winding is installed in the stator housing and forms an annular inner flow channel and an outer flow channel with the stator housing. The outer flow channel is mounted on the annular structure formed by the multiple multi-element stator windings. The inner flow channel is inserted into the annular structure formed by the multiple multi-element stator windings. The gap between adjacent multi-element stator windings is connected to the inner flow channel and the outer flow channel at both ends along the radial direction of the motor. The cooling medium flows through the inner flow channel, the outer flow channel, and the gap between the multi-element stator windings to reduce the winding temperature.

[0051] The stator housing is provided with an outlet and an inlet which are connected with the external flow channel. The outlet and the inlet are evenly distributed around the axis of the stator housing to allow the cooling medium to enter and exit.

[0052] Based on the multi-element stator assembly provided in this embodiment, a multi-element motor is proposed, including the multi-element stator assembly, a rotor assembly and a motor shaft. Two rotor assemblies are arranged on both sides of the multi-element stator assembly and are coaxially arranged with the multi-element stator assembly, and the motor shaft is installed on the rotor assembly.

[0053] In this embodiment, Figure 1 The multi-element stator winding shown is used as an example for explanation. The winding units composed of five coil windings 210 and corresponding core segments 120 arranged along the radial direction of the motor are respectively the first winding unit, the second winding unit, the third winding unit, the fourth winding unit and the fifth winding unit, and a magnetic shielding layer 110 is arranged between adjacent winding units. A plurality of multi-element windings 200 are installed in the stator housing around the axis of the motor, then correspondingly, a plurality of first winding units are arranged in a ring around the axis of the motor to form a first motor unit, a plurality of second winding units are arranged in a ring around the axis of the motor to form a second motor unit, and so on, the remaining three are the third motor unit, the fourth motor unit and the fifth motor unit. That is, a ring-shaped motor unit is formed by the winding units at the same radial position of the motor, and a plurality of motor units are arranged layer by layer.

[0054] In this embodiment, the rated powers of multiple motor units can be the same or different. When the powers are different, more combinations of rated powers can be obtained, which reduces the difference between adjacent rated powers, so that the motor load power is closer to the rated power of the motor, so that the motor always runs near the "high efficiency point", and the efficiency operation curve is changed from a "parabola" to an approximate "horizontal straight line", ensuring the high efficiency and energy saving of the motor, and avoiding the motor operation deviating from the "high efficiency point" of the efficiency curve and causing a huge waste of electric energy. That is, the control of motor units with the same rated power is relatively simple, but a larger number of motor units are required to reduce the difference in rated power; when motor units with different rated powers are used, the control is relatively complex, but a smaller number of motor units can be used to achieve the same energy saving effect.

[0055] When working, the first motor unit can be started first. When the current of the first motor unit is close to the rated current and the current is still rising, the second motor unit is started to increase the rated power of the motor to match the motor load rate. Obviously, other motor units can also be started. When using motor units with different rated powers, a new motor unit can be enabled or the currently working motor unit can be turned off and a motor unit with a larger rated power can be started.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A multi-element stator winding, characterized in that: It comprises a multi-element stator core (100) and a multi-element winding (200); The multi-element stator core (100) comprises a plurality of magnetic shielding layers (110), wherein the magnetic shielding layers (110) divide the multi-element stator core (100) into a plurality of core segments (120) along the radial direction of the motor; The multi-element winding comprises a plurality of coil windings (210), and the coil windings (210) are sleeved on the iron core segment (120).

2. The multi-element stator winding according to claim 1, characterized in that: The iron core segment (120) and the magnetic shielding layer (110) are connected by bonding.

3. The multi-element stator winding according to claim 2, characterized in that: The iron core segment (120) and the magnetic shielding layer (110) are bonded together using epoxy adhesive.

4. The multi-element stator winding according to claim 1, characterized in that: The magnetic shielding layer (110) is made of one of aluminum, copper, nickel alloy, ferrite, stainless steel, chromium aluminum alloy, manganese, nickel, tungsten, and iron-nickel-aluminum alloy.

5. The multi-element stator winding according to claim 1, characterized in that: The iron core segment (120) and the magnetic shielding layer (110) are both multi-layer structures, with each layer arranged along the radial direction of the motor and adjacent layers being bonded and connected.

6. The multi-element stator winding according to claim 5, characterized in that: The magnetic shielding layer includes at least two layers, and adjacent layers are bonded with epoxy adhesive.

7. The multi-element stator winding according to any one of claims 1 to 6, characterized in that: The coil windings (210) are not conductive with each other and are arranged along the radial direction of the motor; The coil winding (210) is sleeved on the iron core segment (120) and corresponds one-to-one with the iron core segment (120) to form a winding unit, and each of the winding units is arranged along the radial direction of the motor.

8. The multi-element stator winding according to claim 1, characterized in that: A connecting protrusion (111) is provided on the magnetic shielding layer (110), and the connecting protrusion (111) is connected to the iron core segment (120), so that the magnetic shielding layer (110) and the iron core segment (120) enclose a containing gap (101); The accommodating gap (101) is used to accommodate the conductive wire of the coil winding (210).

9. A multi-element stator assembly, characterized in that: The multi-element stator winding according to any one of claims 1 to 8 further comprises a stator housing, wherein a plurality of the multi-element stator windings are installed in the stator housing and are evenly distributed around the axis of the stator housing; The coil windings (210) are sleeved on the iron core segments (120) and correspond one-to-one with the iron core segments (120) to form winding units, and each of the winding units is arranged along the radial direction of the motor; The winding units at the same radial position of the motor are arranged around the motor axis to form a motor unit, and a plurality of the motor units are nested in layers; The rated powers of the motor units are the same or different.

10. A multi-element motor, characterized in that: It comprises the multi-element stator assembly as claimed in claim 9.

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