Stator assembly and multi-element radial flux motor

Abstract

The utility model relates to the field of motor technology, and in particular to a stator assembly and a multi-element radial flux motor, aiming to solve the problems of the existing radial flux motor having a single rated power, low operating efficiency, and poor energy-saving effect. The stator assembly provided by the utility model includes a stator core and a coil winding; the stator core includes a first mounting section and a first magnetic shielding section; a plurality of first mounting sections are coaxially arranged and arranged along the axis direction of the motor shaft, and a first magnetic shielding section is arranged between adjacent first mounting sections; the first mounting section is provided with stator teeth evenly distributed around its own axis, and the coil winding is wound around the stator teeth and used to generate radial magnetic flux. The stator assembly provided by the utility model divides the motor into a plurality of independently operated unit motors through the first magnetic shielding section, realizes flexible adjustment of the rated power, and enables the rated power to change with the motor load rate, which not only avoids the situation of a big horse pulling a small cart, but also enables the motor to operate in a high efficiency range, realizing energy saving and consumption reduction.

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 radial flux motor. Background Art

[0002] The operating efficiency curves of existing radial flux motors are all "parabolas", that is, the highest operating efficiency is just a "point" range, and the operating efficiency is the highest when the motor load rate is running at the rated power; when the motor is underloaded or overloaded, the efficiency is very low, consuming more power and producing less output. Therefore, the existing radial flux motors are difficult to operate in a high-efficiency state when the motor load power changes greatly, and energy-saving operation cannot be achieved. At the same time, due to the low overload capacity of the motor, when configuring the motor for the production equipment, it is necessary to configure it according to the maximum load. If the motor is mostly in a low load rate state during operation, the configured high-power motor will cause a big horse to pull a small cart and reduce efficiency, resulting in waste. Utility Model Content

[0003] The utility model aims to provide a stator assembly and a multi-element radial flux motor to solve the problems of the existing radial flux motor having a single rated power, low operating efficiency and poor energy saving effect.

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

[0005] A stator assembly includes a stator core and a coil winding;

[0006] The stator core comprises a first mounting section and a first magnetic shielding section; a plurality of the first mounting sections are coaxially arranged and arranged along the axis direction of the motor shaft, and the first magnetic shielding section is arranged between adjacent first mounting sections;

[0007] The first mounting section is provided with stator teeth evenly distributed around its axis, and the coil winding is wound around the stator teeth and is used to generate radial magnetic flux.

[0008] Furthermore, the first magnetic shielding segment is bonded or bolted to the first mounting segment.

[0009] Furthermore, the first magnetic shielding segment is made of aluminum, copper, nickel alloy, ferrite, stainless steel, chromium aluminum alloy, manganese, nickel, tungsten or iron-nickel-aluminum alloy.

[0010] Furthermore, annular grooves are provided at both ends of the first magnetic shielding segment, and the annular grooves and the first mounting segment form an accommodating cavity to accommodate the ends of the coil winding.

[0011] Furthermore, both ends of the first magnetic shielding segment are provided with accommodating grooves evenly distributed around its own axis, and the accommodating grooves correspond to the stator teeth one by one to accommodate the ends of the coil winding.

[0012] Furthermore, the first mounting section and the first magnetic shielding section are both configured as a multi-piece structure, and each piece is arranged along the axial direction of the motor shaft.

[0013] Another aspect of the present invention provides a multi-element radial flux motor, comprising the above-mentioned stator assembly and a rotor assembly, wherein the rotor assembly is inserted into the stator assembly and is coaxially arranged with the stator assembly;

[0014] The first installation section, the coil winding wound on the first installation section and the stator assembly form a unit motor, and a plurality of the unit motors are arranged along the axial direction of the motor shaft;

[0015] Each of the unit motors operates independently.

[0016] Furthermore, the rotor assembly includes a rotor core and a permanent magnet;

[0017] The rotor core comprises a second mounting section and a second magnetic shielding section; a plurality of the second mounting sections are coaxially arranged and arranged along the axis direction of the motor shaft, and the second magnetic shielding section is arranged between adjacent second mounting sections;

[0018] A plurality of groups of permanent magnets are evenly distributed in an annular shape on the second installation section;

[0019] The first installation section and the second installation section correspond one to one, and together with the corresponding coil winding and the permanent magnet, form the unit motor. A plurality of the unit motors are separated by the first magnetic shielding section and the second magnetic shielding section.

[0020] Furthermore, the second mounting section is provided with a plurality of mounting grooves evenly distributed around its axis;

[0021] The installation groove includes two sub-grooves that are symmetrically arranged and arranged in a V shape, and the permanent magnet is installed in the sub-grooves.

[0022] Furthermore, the second magnetic shielding segment is made of aluminum, copper, nickel alloy, ferrite, stainless steel, chromium aluminum alloy, manganese, nickel, tungsten or iron-nickel-aluminum alloy.

[0023] Based on the above technical solutions, the technical effects that can be achieved by the utility model are:

[0024] The stator assembly provided by the utility model comprises a stator core and a coil winding; the stator core comprises a first mounting section and a first magnetic shielding section; a plurality of first mounting sections are coaxially arranged and arranged along the axial direction of the motor shaft, and a first magnetic shielding section is arranged between adjacent first mounting sections; the first mounting section is provided with stator teeth evenly distributed around its own axis, and the coil winding is wound around the stator teeth and is used to generate radial magnetic flux.

[0025] The stator assembly provided by the utility model divides the stator core into a plurality of first installation sections along the axis direction of the motor shaft through the first magnetic shielding section, and the coil windings are respectively wound on each first installation section, so that the first installation section wound with the coil windings and the rotor assembly form a unit motor. That is, a motor is divided into a plurality of independently running unit motors arranged along the axis direction of the motor through the first magnetic shielding section, so that the rated power of the motor is changed by controlling the number of starts of the unit motor, so that the rated power of the motor can change with the motor load rate, which not only avoids the situation of a big horse pulling a small cart, but also makes the motor run in a high efficiency range, avoids energy waste, and achieves energy saving and consumption reduction.

[0026] At the same time, the shielding effect of the first magnetic shielding section on the magnetic field prevents the various unit motors from interfering with each other when working at the same time, especially when starting the second and subsequent unit motors, it prevents the working unit motors from interfering with the start of the subsequent unit motors, ensuring the normal start and operation of each motor. Compared with eliminating interference through the interference pulse elimination circuit, the effect of the first magnetic shielding section is more stable and the control difficulty is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 It is a structural schematic diagram of the stator core;

[0029] Figure 2 is a structural schematic diagram of the first installation section;

[0030] Figure 3 is a schematic structural diagram of the first shielding segment;

[0031] Figure 4 It is a schematic diagram of the structure of the rotor core;

[0032] Figure 5 It is a structural schematic diagram of the second installation section.

[0033] Icons: 110, stator core; 111, first mounting section; 112, first magnetic shielding section; 101, stator tooth; 102, annular groove; 210, rotor core; 211, second mounting section; 212, second magnetic shielding section; 201, mounting slot; 202, sub-slot. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The operating efficiency curves of existing radial flux motors are all "parabolas", that is, the highest operating efficiency is just a "point" range, and the operating efficiency is the highest when the motor load rate is running at the rated power; when the motor is underloaded or overloaded, the efficiency is very low, consuming more power and producing less output. Therefore, the existing radial flux motors are difficult to operate in a high-efficiency state when the motor load power changes greatly, and energy-saving operation cannot be achieved. At the same time, due to the low overload capacity of the motor, when configuring the motor for the production equipment, it is necessary to configure it according to the maximum load. If the motor is mostly in a low load rate state during operation, the configured high-power motor will cause a big horse to pull a small cart and reduce efficiency, resulting in waste.

[0038] In view of this, the utility model provides a stator assembly, including a stator core 110 and a coil winding; the stator core 110 includes a first mounting section 111 and a first magnetic shielding section 112; a plurality of first mounting sections 111 are coaxially arranged and arranged along the axial direction of the motor shaft, and a first magnetic shielding section 112 is arranged between adjacent first mounting sections 111; the first mounting section 111 is provided with stator teeth 101 evenly distributed around its own axis, and the coil winding is wound around the stator teeth 101 and is used to generate radial magnetic flux.

[0039] The stator assembly provided by the utility model divides the stator core 110 into a plurality of first installation sections 111 along the axis direction of the motor shaft through the first magnetic shielding section 112, and coil windings are respectively wound on each first installation section 111, so that the first installation section 111 wound with coil windings and the rotor assembly form a unit motor. That is, a motor is divided into a plurality of independently running unit motors arranged along the axis direction of the motor through the first magnetic shielding section 112, so that the rated power of the motor is changed by controlling the number of starts of the unit motor, so that the rated power of the motor can change with the motor load rate, which not only avoids the situation of a big horse pulling a small cart, but also makes the motor run in a high efficiency range, avoids energy waste, and achieves energy saving and consumption reduction.

[0040] At the same time, the shielding effect of the first magnetic shielding segment 112 on the magnetic field prevents the various unit motors from interfering with each other when working at the same time, especially when starting the second and subsequent unit motors, it prevents the working unit motors from interfering with the start of the subsequent unit motors, thereby ensuring the normal start and operation of each motor. Compared with eliminating interference through the interference pulse elimination circuit, the effect of the first magnetic shielding segment 112 is more stable and the control difficulty is lower.

[0041] The following combination Figure 1-Figure 3 The structure and shape of the stator assembly provided in this embodiment are described in detail:

[0042] In this embodiment, the first magnetic shielding section 112 is bonded or bolted to the first mounting section 111. Specifically, epoxy glue may be used for bonding.

[0043] To reduce eddy current loss, the first magnetic shielding section 112 and the first mounting section 111 are both configured as a multi-piece structure, each piece is arranged along the axis direction of the motor shaft, and each piece is bonded and connected by epoxy adhesive. The first magnetic shielding section 112 uses two metal layers bonded with epoxy adhesive in the middle to achieve a good magnetic shielding effect.

[0044] In this embodiment, the first magnetic shielding section 112 is made of 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.

[0045] In this embodiment, the winding method of the coil winding is the prior art and will not be described in detail. The coil winding is wound with a wire with a circular or rectangular cross section and pressed into a rectangular cross section, which can further improve the tightness of the winding to increase the full slot rate and reduce resistance and eddy current loss.

[0046] In order to facilitate the winding of the coil winding and prevent the coil winding from being squeezed, annular grooves 102 are provided at both ends of the first magnetic shielding section 112. The annular grooves 102 and the first mounting section 111 form a receiving cavity to accommodate the ends of the coil winding.

[0047] Optionally, both ends of the first magnetic shielding segment 112 are provided with receiving grooves evenly distributed around its own axis, and the receiving grooves correspond one-to-one with the stator teeth 101 to receive the ends of the coil windings.

[0048] Similarly, grooves can be provided at both ends of the stator teeth 101 along the motor shaft axis to accommodate the ends of the coil windings, so as to prevent the ends of the coil windings from protruding from the end surface of the stator core 110, thereby avoiding being squeezed by the first magnetic shielding segment 112. At this time, the first magnetic shielding segment 112 can be set as a circular ring plate structure.

[0049] Based on the stator assembly provided in this embodiment, a multi-element radial flux motor is proposed, including the above-mentioned stator assembly, and also including a rotor assembly and a motor shaft. The rotor assembly is inserted into the stator assembly and is coaxially arranged with the stator assembly. The motor shaft is inserted into the rotor assembly and is coaxially connected with the rotor assembly. When working, the rotor assembly drives the motor shaft to rotate to output torque.

[0050] In this embodiment, the first installation section 111, the coil winding wound on the first installation section 111 and the stator assembly constitute a unit motor, and a plurality of unit motors are arranged along the axial direction of the motor shaft and each unit motor operates independently.

[0051] In this embodiment, the rotor assembly includes a rotor core 210 and a permanent magnet; the rotor core 210 includes a second mounting section 211 and a second magnetic shielding section 212. Figure 4 As shown, a plurality of second mounting sections 211 are coaxially arranged and arranged along the axis direction of the motor shaft, and a second magnetic shielding section 212 is arranged between adjacent second mounting sections 211; a plurality of groups of permanent magnets are evenly distributed in an annular manner in the second mounting section 211. Specifically, the second mounting section 211 and the second magnetic shielding section 212 can be connected by bolts or adhesively bonded.

[0052] In this embodiment, the second mounting section 211 is provided with a plurality of mounting grooves 201 evenly distributed around its axis; the mounting groove 201 includes two sub-grooves 202 symmetrically arranged and arranged in a V shape, such as Figure 5 As shown, the V-shaped opening faces away from the axis of the second installation section 211, and the permanent magnet is installed in the sub-slot 202. Specifically, a plurality of installation slots 201 are arranged along the radial direction of the second installation section 211 for installing a group of permanent magnets.

[0053] In this embodiment, the first mounting section 111 and the second mounting section 211 correspond one to one, and form a unit motor with the corresponding coil winding and permanent magnet. Multiple unit motors are separated by the first magnetic shielding section 112 and the second magnetic shielding section 212 and operate independently. Among them, the second magnetic shielding section 212 is made of aluminum, copper, nickel alloy, ferrite, stainless steel, chromium aluminum alloy, manganese, nickel, tungsten or iron-nickel-aluminum alloy. Furthermore, the second mounting section 211 and the second magnetic shielding section 212 can also adopt a multi-piece structure to reduce the influence of eddy currents. The second magnetic shielding section 212 adopts a method of bonding two metal layers with epoxy glue in the middle to achieve a good magnetic shielding effect.

[0054] In this embodiment, the motor is divided into six unit motors along the motor axis direction, such as Figure 1 , Figure 4 As shown, they are named as the first unit motor, the second unit motor, the third unit motor, the fourth unit motor, the fifth unit motor and the sixth unit motor in sequence.

[0055] In this embodiment, the rated powers of multiple unit motors can be the same or different. When the powers are different, more combined 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 unit motors with the same rated power is relatively simple, but a larger number of unit motors are required to reduce the difference in rated power; when unit motors with different rated powers are used, the control is relatively complex, but a smaller number of unit motors can be used to achieve the same energy saving effect.

[0056] When working, the first unit motor can be started first. When the current of the first unit motor is close to the rated current and the current is still rising, the second unit motor is started to increase the rated power of the motor to match the motor load rate. Obviously, other unit motors can also be started. When unit motors with different rated powers are used, a new unit motor can be enabled or the currently working unit motor can be turned off and a unit motor with a larger rated power can be started.

[0057] 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 stator core (110) and a coil winding; The stator core (110) comprises a first mounting section (111) and a first magnetic shielding section (112); a plurality of the first mounting sections (111) are coaxially arranged and arranged along the axis direction of the motor shaft, and the first magnetic shielding section (112) is arranged between adjacent first mounting sections (111); The first mounting section (111) is provided with stator teeth (101) evenly distributed around its axis, and the coil winding is wound around the stator teeth (101) and is used to generate radial magnetic flux.

2. The stator assembly according to claim 1, characterized in that: The first magnetic shielding section (112) is bonded or bolted to the first mounting section (111).

3. The stator assembly according to claim 1, characterized in that: The first magnetic shielding section (112) is made of aluminum, copper, nickel alloy, ferrite, stainless steel, chromium aluminum alloy, manganese, nickel, tungsten or iron-nickel-aluminum alloy.

4. The stator assembly according to claim 1, characterized in that: Annular grooves (102) are provided at both ends of the first magnetic shielding section (112), and the annular groove (102) and the first mounting section (111) form an accommodating cavity to accommodate the end of the coil winding.

5. The stator assembly according to claim 1, characterized in that: Both ends of the first magnetic shielding section (112) are provided with accommodating grooves evenly distributed around its own axis, and the accommodating grooves correspond one-to-one with the stator teeth (101) to accommodate the ends of the coil winding.

6. The stator assembly according to claim 1, characterized in that: The first mounting section (111) and the first magnetic shielding section (112) are both configured as a multi-piece structure, with each piece being arranged along the axial direction of the motor shaft.

7. A multi-element radial flux motor, characterized in that: It comprises the stator assembly according to any one of claims 1 to 6, and further comprises a rotor assembly, wherein the rotor assembly is inserted into the stator assembly and is coaxially arranged with the stator assembly; The first mounting section (111), the coil winding wound around the first mounting section (111), and the stator assembly form a unit motor, and a plurality of the unit motors are arranged along the axial direction of the motor shaft; Each of the unit motors operates independently.

8. The multi-element radial flux motor according to claim 7, characterized in that: The rotor assembly comprises a rotor core (210) and a permanent magnet; The rotor core (210) comprises a second mounting section (211) and a second magnetic shielding section (212); a plurality of the second mounting sections (211) are coaxially arranged and arranged along the axis direction of the motor shaft, and the second magnetic shielding section (212) is arranged between adjacent second mounting sections (211); A plurality of groups of permanent magnets are evenly distributed in an annular shape on the second installation section (211); The first mounting section (111) and the second mounting section (211) correspond one to one, and together with the corresponding coil windings and the permanent magnets form the unit motor, and a plurality of the unit motors are separated by the first magnetic shielding section (112) and the second magnetic shielding section (212).

9. The multi-element radial flux motor according to claim 8, characterized in that: The second mounting section (211) is provided with a plurality of mounting grooves (201) evenly distributed around its axis; The installation groove (201) comprises two sub-grooves (202) that are symmetrically arranged and arranged in a V shape, and the permanent magnet is installed in the sub-grooves (202).

10. The multi-element radial flux motor according to claim 8, characterized in that: The second magnetic shielding section (212) is made of aluminum, copper, nickel alloy, ferrite, stainless steel, chromium aluminum alloy, manganese, nickel, tungsten or iron-nickel-aluminum alloy.

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