Stator assembly and multi-element motor

Abstract

The utility model relates to the technical field of motors, in particular to a 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 stator assembly provided by the utility model comprises a plurality of motor units arranged around the axis of the motor, and each motor unit comprises an A-phase winding, a B-phase winding and a C-phase winding. According to the stator assembly provided by the utility model, the arrangement of the plurality of motor units along the axial direction of the motor is changed into the arrangement of the plurality of motor units around the axis of the motor, so that the interference between adjacent motor units during working is avoided, the normal starting of the subsequent motor units is ensured, and unnecessary loss is reduced. Meanwhile, the rated power of the motor can be changed by controlling the starting number of the motor units, so that the current rated power of the motor is close to the load rate of the motor, and the operation efficiency curve of the motor is approximate to a horizontal straight line, namely, the motor operates in a high-efficiency interval, and high efficiency and energy conservation are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a 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 axial direction, 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 stator assembly and a multi-element motor 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 stator assembly comprises a plurality of motor units arranged around a motor axis, wherein the motor units comprise an A-phase winding, a B-phase winding and a C-phase winding.

[0006] Furthermore, an isolation gap is provided between adjacent motor units.

[0007] Furthermore, the A-phase winding, the B-phase winding and the C-phase winding each include an iron core and a coil winding, and the coil winding is wound around the iron core.

[0008] Furthermore, the stator assembly includes eight motor units arranged in a ring around the motor axis.

[0009] Furthermore, the motor unit includes three A-phase windings, three B-phase windings and three C-phase windings.

[0010] Furthermore, the three A-phase windings, the three B-phase windings and the three C-phase windings are arranged in sequence and in an arc shape along the circumference of the motor.

[0011] Furthermore, each of the motor units operates independently, and the output power of each of the motor units is the same or different.

[0012] Furthermore, the A-phase winding, the B-phase winding and the C-phase winding are sequentially arranged in a fan ring along the circumference of the motor.

[0013] Furthermore, the number of the motor units is an even number.

[0014] Another aspect of the present invention provides a multi-element motor including the above-mentioned stator assembly.

[0015] Based on the above technical solutions, the technical effects that can be achieved by the utility model are:

[0016] The stator assembly provided by the utility model comprises a plurality of motor units arranged around the motor axis, and the motor unit comprises an A-phase winding, a B-phase winding and a C-phase winding.

[0017] The stator assembly provided by the utility model changes the arrangement of multiple motor units from along the motor axis to around the motor axis, thereby avoiding interference between adjacent motor units during operation, ensuring the normal startup of subsequent motor units and reducing unnecessary losses. At the same time, the rated power of the motor can be changed by controlling the number of motor units started, so that the current rated power of the motor is close to the motor load rate, so that the operating efficiency curve of the motor is approximately a "horizontal straight line", that is, it is maintained in a high efficiency range to achieve high efficiency and energy saving. Therefore, the motor can be suitable for use scenarios with a large power width, and avoid the situation where the motor operation efficiency is low and the electric energy is wasted due to a large horse pulling a small cart. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 A schematic diagram of the winding arrangement of a stator assembly provided in an embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the winding arrangement of the stator assembly provided in an embodiment of the utility model.

[0021] Icons: 100, motor unit; 110, A-phase winding; 120, B-phase winding; 130, C-phase winding; 111, iron core; 112, coil winding; 101, isolation gap. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] In view of this, the present invention provides a stator assembly, including a plurality of motor units 100 arranged around the motor axis, wherein the motor unit 100 includes an A-phase winding 110 , a B-phase winding 120 and a C-phase winding 130 .

[0027] The stator assembly provided by the utility model changes the arrangement of multiple motor units 100 from along the motor axis to around the motor axis, thereby avoiding interference between adjacent motor units 100 during operation, ensuring the normal startup of subsequent motor units 100 and reducing unnecessary losses. At the same time, the rated power of the motor can be changed by controlling the number of motor units 100 started, so that the current rated power of the motor is close to the motor load rate, so that the operating efficiency curve of the motor is approximately a "horizontal straight line", that is, it is maintained in a high efficiency range to achieve high efficiency and energy saving. Therefore, the motor can be suitable for use scenarios with a large power width, and avoid the situation where the motor operation efficiency is low and the electric energy is wasted due to a large horse pulling a small cart.

[0028] The following combination Figure 1 , Figure 2 The structure and shape of the stator assembly provided in this embodiment are described in detail:

[0029] In this embodiment, the stator assembly includes a plurality of motor units 100 evenly distributed around the motor axis, and an isolation gap 101 is provided between adjacent motor units 100 to avoid interference between adjacent motor units 100, and the width of the isolation gap 101 is set according to actual conditions. Specifically, the A-phase winding 110, the B-phase winding 120, and the C-phase winding 130 each include an iron core 111 and a coil winding 112, and the coil winding 112 is wound around the iron core 111. Among them, the coil winding 112 can be wound with a wire with a rectangular cross-section to increase the coil full slot rate and increase the motor output power.

[0030] In this embodiment, each motor unit 100 operates independently without interfering with each other; the output power of each motor unit 100 may be the same or different.

[0031] When each motor unit 100 uses differentiated power, the total rated power can be more flexibly controlled to better match the motor rated power with the load power. When each motor unit 100 uses the same power, the motor consistency is better and easier to control, which is conducive to stable operation of the motor and avoids acceleration and deceleration shocks caused by inconsistent acceleration.

[0032] In the optional scheme of this embodiment, the number of motor units 100 can be an odd number or an even number. When the number of motor units 100 is an even number, it is beneficial to the control of the motor and the stable operation of the motor. That is, when the second motor unit 100 needs to be started, the second motor unit 100 is 180° away from the first started motor unit 100, thereby avoiding the interference of the started motor unit 100 with the unstarted motor unit 100, and at the same time, the two motor units 100 are evenly distributed around the motor axis to ensure the stable operation of the motor and avoid the influence of uneven force.

[0033] In this embodiment, the stator assembly includes eight motor units 100 arranged in a ring around the motor axis, that is, the number of motor units 100 is an even number. Specifically, a total of 72 windings are included, and nine adjacent windings constitute one motor unit 100, that is, one motor unit 100 includes three A-phase windings 110, three B-phase windings 120, and three C-phase windings 130 arranged in sequence and arranged in an arc along the circumference of the motor. The three A-phase windings 110 can be arranged in series, the three B-phase windings 120 can be arranged in series, and the three C-phase windings 130 can be arranged in series; in the three windings of the same phase, the winding directions of adjacent windings are opposite.

[0034] That is, the stator assembly provided in this embodiment is divided into eight fan-shaped areas evenly distributed around the motor axis, and a motor unit 100 is arranged in each fan-shaped area. Figure 1 , Figure 2 Specifically, the nine windings constituting one motor unit 100 are arranged in a fan ring shape along the circumference of the motor, and three adjacent windings are in phase.

[0035] It should be noted that although the windings in a motor unit 100 are not evenly distributed around the motor axis, no dynamic balance or unstable operation problems occurred in actual verification. In fact, as long as the motor shaft is well installed, the rotation stability can be guaranteed and will not be affected by the winding layout.

[0036] Based on the stator assembly provided in this embodiment, a multi-element motor is proposed, including the above-mentioned stator assembly, and also including a rotor assembly and a motor shaft. Two rotor assemblies are arranged on both sides of the stator assembly and are coaxially arranged with the stator assembly, and the motor shaft is installed on the rotor assembly. Specifically, the stator assembly also includes a stator housing, the motor unit 100 is installed in the stator housing and forms an inner flow channel and an outer flow channel in a ring shape with the stator housing, the outer flow channel is sleeved on the annular structure surrounded by multiple motor units 100, and the inner flow channel is inserted into the annular structure surrounded by multiple motor units 100. The gap between the windings and the two ends of the isolation gap 101 between the motor units 100 are connected to the inner flow channel and the outer flow channel respectively, and the cooling medium flows through the inner flow channel, the outer flow channel, and the gap between the windings and the isolation gap 101 to reduce the winding temperature.

[0037] 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.

[0038] The working process of the multi-element motor provided in this embodiment is as follows:

[0039] The eight motor units 100 evenly distributed around the motor axis are named motor No. 1 to motor No. 8. The distance between motor No. 1 and motor No. 5 is 180°, the distance between motor No. 2 and motor No. 6 is 180°, and so on.

[0040] During operation, motor No. 1 can be started first. When the current of motor No. 1 is close to the rated current and the current is still rising, motor No. 5 can be started. Since motor No. 1 and motor No. 5 are the farthest apart, the interference is minimal, motor No. 5 can be started smoothly, and it is also beneficial to the force balance of the motor shaft. When a higher rated power is required, more motor units 100 can be started, and the third motor unit 100 to be started can be any unstarted motor unit 100, preferably a motor unit 100 located in the middle of the two started motor units 100. At this time, motor No. 3 or motor No. 7 can be selected, and the fourth motor unit 100 to be started is one of motor No. 3 or motor No. 7 that has not been started. That is, the motor unit 100 with an even number in the starting order is 180° away from the previous motor unit 100 started.

[0041] The multi-element motor provided in this embodiment achieves flexible control of the motor output power by replacing a set of windings of an ordinary motor with multiple sets of windings evenly distributed around the motor axis, so that the rated power of the motor is flexible and has a larger adjustment range and higher operating efficiency. A set of windings is a motor unit 100. When the motor is used in a low-power output scenario, only one motor unit 100 is powered on; when the required power output increases, more motor units 100 are enabled to increase the output power, so that the motor can be used in scenarios with a large power span, avoiding the situation where the motor has low operating efficiency and a large waste of electric energy caused by a big horse pulling a small cart. At the same time, by controlling the number of enabled motor units 100, the current rated power of the motor is close to the motor load rate, so that the motor's operating efficiency curve is approximately a "horizontal straight line", that is, it is kept in a high-efficiency range, thereby achieving high efficiency and energy saving. That is, after the already started motor unit 100 enters the high-efficiency zone, a new motor unit 100 is started, so that the motor load rate is always close to the current 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", thereby 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.

[0042] Since the rated power of the motor is variable and always close to the motor load rate, the total efficiency of the multi-element motor provided in this embodiment is always between 95% and 99%, and has a very large high efficiency range, thereby achieving a very high power saving rate. When the load rate is 5%, the operating efficiency of the multi-element motor can reach about 95%; while if the operating efficiency of an ordinary motor is to reach more than 90%, its load rate must reach about 100%, that is, it operates near the rated power. Therefore, when the load of an ordinary motor fluctuates in actual use and when a frequency converter is used for speed regulation, its operating efficiency is significantly reduced, resulting in a situation where the power consumption is high but the motor output is small, and it is difficult to achieve the effect that the multi-element motor provided in this embodiment can adjust the rated power according to the motor load to ensure high efficiency.

[0043] The multi-element motor provided in this embodiment can adjust its rated power according to the motor load so that the motor load rate operates at the current rated power. When the motor load rate fluctuates between 5% and 150%, the motor efficiency is always between 95% and 99%, thereby achieving the purpose of high efficiency and energy saving.

[0044] Compared with the existing multi-element motor in which the motor units 100 are arranged along the axial direction of the motor, that is, the coil windings 112 of multiple motor units 100 are wound on one iron core 111, and the windings of one motor unit 100 are evenly distributed in a ring-shaped structure around the axis of the motor, the multi-element motor provided in this embodiment has one coil winding 112 wound on one iron core 111, and the windings of one motor unit 100 are arranged along the circumference of the motor and in a fan-shaped arrangement, so that the arrangement of the windings, the setting of the isolation gap 101 and the reasonable starting sequence can effectively avoid mutual interference during the startup and operation of the motor units 100, thereby ensuring smooth startup of the motor and reducing losses.

[0045] 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 stator assembly, characterized in that: It comprises a plurality of motor units (100) arranged around a motor axis, wherein the motor unit (100) comprises an A-phase winding (110), a B-phase winding (120) and a C-phase winding (130); Each of the motor units (100) operates independently.

2. The stator assembly according to claim 1, characterized in that: An isolation gap (101) is provided between adjacent motor units (100).

3. The stator assembly according to claim 1, characterized in that: The A-phase winding (110), the B-phase winding (120), and the C-phase winding (130) each comprise an iron core (111) and a coil winding (112), wherein the coil winding (112) is wound around the iron core (111).

4. The stator assembly according to claim 1, characterized in that: The invention comprises eight motor units (100) which are arranged in a ring around a motor axis.

5. The stator assembly according to claim 4, characterized in that: The motor unit (100) comprises three A-phase windings (110), three B-phase windings (120) and three C-phase windings (130).

6. The stator assembly according to claim 5, characterized in that: The three A-phase windings (110), the three B-phase windings (120) and the three C-phase windings (130) are arranged in sequence and in an arc shape along the circumference of the motor.

7. The stator assembly according to claim 1, characterized in that: The output powers of the motor units (100) are the same or different.

8. The stator assembly according to claim 1, characterized in that: The A-phase winding (110), the B-phase winding (120), and the C-phase winding (130) are sequentially arranged in a fan ring along the circumference of the motor.

9. The stator assembly according to claim 1, characterized in that: The number of the motor units (100) is an even number.

10. A multi-element motor, characterized in that: Comprising a stator assembly as described in any one of claims 1-9.

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