Three-phase conducting ring device, motor stator and motor
By setting up three stacked conductive ring devices on the motor stator and increasing the number of winding parallel branches, the problem of difficulty in wire winding when increasing the rated current and power of the three-phase motor is solved, and the electric load and current density are reduced.
Patent Information
- Application Number
- CN202420534605.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-03-19
AI Technical Summary
When existing three-phase motors increase the rated current to increase the output power, it is difficult to meet the requirements of wire winding, resulting in difficult processing and limited design of the rated current.
Three stacked conductive ring devices are used to increase the number of winding parallel branches, and the cross-section of the wire is equivalently increased, thereby reducing the electric load and current density of the motor.
The need to increase the rated current and power of the motor output is achieved, simplifies coil winding processing, and reduces electrical load and current density.
Smart Images
Figure CN222441431U_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present application relate to the technical field of motor control, and more specifically, to a three-phase conductive ring device, a motor stator, and a motor. Background Art
[0002] A brushless DC motor usually adopts a structure in which each phase winding is connected in series. Each coil is connected in series to form a phase, and there is usually a parallel branch between each phase to connect the motor controller to achieve current control and drive, that is, the number of parallel branches is set to 1.
[0003] In real life, in order to ensure that the motor can operate safely and stably under the design requirements, the motor needs to be operated under rated voltage and speed conditions. When the motor is running at rated voltage and rated speed, if the output power of the motor is to be increased, the rated current of the motor needs to be increased. For a three-phase motor, the number of coils of the three-phase motor is usually fixed. There are usually three coil windings, each of which is distributed 120 degrees, called phase A, phase B and phase C respectively. The magnetic fields generated by these three coil windings that are displaced 120 degrees from each other interact to form a rotating magnetic field to drive the motor to rotate. Although the number of coils of a three-phase motor is usually fixed, the performance and characteristics of the motor can be adjusted by changing the number of turns, cross-sectional area, winding method and other parameters of the coil winding. Then, the thickness of the wire in the motor determines the size of the rated current of the motor, that is, the thicker the stator coil wire, the greater the rated current of the motor, and the thinner the stator coil wire, the smaller the rated current of the motor.
[0004] In general, the difficulty of coil winding is proportional to the thickness of the stator coil wire, that is, the thicker the stator coil wire, the more difficult the coil winding process is; at the same time, the thicker the coil wire, the larger the space occupied by the winding. Due to the limited size of the motor structure, according to its processing technology or electromagnetic design requirements, the size of the stator slot has a certain range. When a relatively large rated current is required to drive the motor, the coil wire has to be as thick as possible, which can easily lead to the motor stator slot being too deep or the coil cannot be placed in the slot. When a larger rated current is required to increase the rated power of the motor, the existing technical solutions are completely unable to meet the requirements for normal winding of the wire. Utility Model Content
[0005] In order to solve the technical problem described in the background technology that the winding process of thick wire coils is difficult and the rated current design of the three-phase motor is limited, the embodiments of the present application provide a three-phase conductive ring device, a motor stator and a motor.
[0006] In a first aspect, an embodiment of the present application provides a three-phase conductive ring device, which is arranged on a stator of a motor, comprising:
[0007] A first conductive ring is provided with a first power input connector connected to an input power source and two first wire connectors for connecting to a first single-phase winding wire of a stator to increase the number of winding parallel branches;
[0008] A second conductive ring is provided with a second power input connector connected to an input power source and two second wire connectors for connecting to a second single-phase winding wire of the stator to increase the number of winding parallel branches;
[0009] A third conductive ring is provided with a third power input connector connected to the input power supply and two third wire connectors for connecting to the third single-phase winding wire of the stator to increase the number of winding parallel branches;
[0010] A first insulating sheet, stacked between the first conductive ring and the second conductive ring;
[0011] The second insulating sheet is stacked between the second conductive ring and the third conductive ring.
[0012] In some preferred embodiments, the first power input connector and the first wire connector are arranged on the outer ring of the first conductive ring and extend outward; the second power input connector and the second wire connector are arranged on the outer ring of the second conductive ring and extend outward; the third power input connector and the third wire connector are arranged on the outer ring of the third conductive ring and extend outward; the first power input connector, the second power input connector, the third power input connector, the first wire connector, the second wire connector and the third wire connector are arranged not to overlap in space.
[0013] In some preferred embodiments, the first wire connector, the second wire connector and the third wire connector are all provided with placement grooves for welding wires.
[0014] In some preferred embodiments, the first power input connector, the second power input connector and the third power input connector are all provided with connection holes for stably contacting and connecting with the input power.
[0015] In some preferred embodiments, the first conductive ring is provided with at least one first fixing component, and the first fixing component is provided to extend toward the stator.
[0016] In some preferred embodiments, the second conductive ring is provided with at least one second fixing component, and the second fixing component is provided to extend toward the stator.
[0017] In some preferred embodiments, the third conductive ring is provided with at least one third fixing component, and the third fixing component is provided to extend toward the stator.
[0018] In some preferred embodiments, the first fixing component is disposed on the first wire connector; the second fixing component is disposed on the second wire connector; and the third fixing component is disposed on the third wire connector.
[0019] In a second aspect, an embodiment of the present application provides a motor stator, comprising at least an iron core, a three-phase winding, and the three-phase conductive ring device as described in the first aspect;
[0020] The three-phase conductive ring device is arranged on one side of the iron core, opposite to the winding output end; each phase winding output end is respectively connected to the first wire connector of the first conductive ring, the second wire connector of the second conductive ring and the third wire connector of the third conductive ring.
[0021] In a third aspect, an embodiment of the present application provides a motor, comprising at least the three-phase conductive ring device as described in the first aspect, or the motor stator as described in the second aspect.
[0022] Beneficial effects:
[0023] The present application uses three stacked conductive rings to increase the rated current of the motor output, thereby increasing the output power of the motor. By connecting the output end of the first single-phase winding in parallel with multiple first wire connectors of the first conductive ring, connecting the output end of the second single-phase winding in parallel with multiple second wire connectors of the second conductive ring, and connecting the output end of the third single-phase winding in parallel with multiple third wire connectors of the third conductive ring, the cross-section of each winding wire is equivalently increased, thereby reducing the electrical load and current density of the motor. The present application increases the number of parallel branches of the stator winding through a three-phase conductive ring device, solving the technical problem that the rated current design of the three-phase motor is limited due to the difficulty of winding the thick wire coil. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 A schematic diagram of the structure of a three-phase conductive ring device provided in an embodiment of the present application.
[0025] Figure 2 An exploded view of a three-phase conductive ring device provided in an embodiment of the present application.
[0026] Figure 3 A top view of a three-phase conductive ring device provided in an embodiment of the present application.
[0027] Figure 4 A circuit schematic diagram of a conductive ring provided in an embodiment of the present application.
[0028] Figure 5 A schematic diagram of the structure of a motor stator provided in an embodiment of the present application.
[0029] Figure 6 A top view of the motor stator provided in an embodiment of the present application.
[0030] Reference numerals:
[0031] 10-first conductive ring, 11-first wire connector, 12-first power input connector, 13-first fixing assembly;
[0032] 20-second conductive ring, 21-second wire connector, 22-second power input connector, 23-second fixing assembly;
[0033] 30-third conductive ring, 31-third wire connector, 32-third power input connector, 33-third fixing assembly;
[0034] 40-first insulating sheet; 41-second insulating sheet;
[0035] f-motor stator, 01-three-phase conductive ring device, 02-iron core. DETAILED DESCRIPTION
[0036] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.
[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the specific technical solution of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.
[0038] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.
[0039] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left" and "right" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to the changes in the orientation of the components in the drawings.
[0040] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.
[0041] In the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.
[0042] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.
[0043] Embodiment 1
[0044] like Figure 1 As shown, Figure 1 The schematic diagram of the structure of the three-phase conductive ring device 01 provided in the embodiment of the present application is shown. The three-phase conductive ring device 01 is arranged on the motor stator f, and includes a first conductive ring 10, a second conductive ring 20, a third conductive ring 30, a first insulating sheet 40 and a second insulating sheet 41.
[0045] For details, please refer to Figure 2 and Figure 3 , Figure 2 An exploded view of a three-phase conductive ring device provided in an embodiment of the present application is shown.
[0046] Figure 3 A top view of a three-phase conductive ring device provided in an embodiment of the present application is shown.
[0047] The first conductive ring 10 is provided with a first power input connector 12 and two first wire connectors 11. The first power input connector 12 is provided to be connected to the input power. The two first wire connectors 11 are arranged opposite to each other, i.e., 180 degrees, and are respectively connected to the stator first single-phase winding wires, mainly for increasing the number of branches connected in parallel to the stator first single-phase winding.
[0048] The second conductive ring 20 is provided with a second power input connector 22 and two second wire connectors 21. The second power input connector 22 is provided to be connected to the input power. The two second wire connectors 21 are arranged opposite to each other, i.e., 180 degrees, and are respectively connected to the stator second single-phase winding wires, mainly for increasing the number of branches of the stator second single-phase winding in parallel.
[0049] The third conductive ring 30 is provided with a third power input connector 32 and two third wire connectors 31. The third power input connector 32 is provided to be connected to the input power. The two third wire connectors 31 are arranged opposite to each other, i.e., 180 degrees, and are respectively connected to the stator third single-phase winding wires, mainly for increasing the number of branches of the stator third single-phase winding in parallel.
[0050] In this embodiment, the first single-phase winding of the stator may be a U-phase winding, the second single-phase winding may be a V-phase winding, and the third single-phase winding may be a W-phase winding.
[0051] In this embodiment, in order to avoid short circuit between the first conductive ring 10 and the second conductive ring 20 , a first insulating sheet 40 needs to be provided between the first conductive ring 10 and the second conductive ring 20 , that is, the first insulating sheet 40 is stacked between the first conductive ring 10 and the second conductive ring 20 .
[0052] In this embodiment, in order to avoid short circuit between the second conductive ring 20 and the third conductive ring 30 , a second insulating sheet 41 needs to be provided between the second conductive ring 20 and the third conductive ring 30 , that is, the second insulating sheet 41 is stacked between the second conductive ring 20 and the third conductive ring 30 .
[0053] Please refer to Figure 4 , Figure 4 A circuit schematic diagram of a conductive ring provided in an embodiment of the present application is shown.
[0054] Through the above structural connection, the working principle of the embodiment of the present application can be:
[0055] The resistances of the U-phase winding, the V-phase winding and the W-phase winding are connected in parallel to the circuit respectively. Then, the calculation formula of the resistance of each phase winding can be:
[0056] 1 / R U =1 / R1+1 / R2+…+1 / R n ;
[0057] 1 / R V =1 / R 11 +1 / R 12 +…+1 / R m ;
[0058] 1 / R W =1 / R 21 +1 / R 22 +…+1 / R z ;
[0059] Among them, R U is the total resistance of phase U, R V is the total resistance of phase V, RW is the total resistance of phase W. In this embodiment, the value of n is 2, the value of m is 12, and the value of z is 22.
[0060] Then the electrical load E is:
[0061] E= ;
[0062] Among them, Q represents the number of motor slots; N represents the number of turns of a single tooth winding; m represents the number of motor phases; a represents the number of parallel branches; I represents the effective value of phase current (A).
[0063] The current density J is:
[0064] J= ;
[0065] Where, I represents the effective value of phase current (A); a represents the number of parallel branches; b represents the number of parallel windings; and Ds represents the diameter of a single conductor (mm).
[0066] It can be seen that after the three-phase conductive ring device increases the number of parallel winding branches, the resistance of each phase becomes smaller, thereby reducing the electrical load and current density.
[0067] The present application has a simple structure, is extremely easy to produce and process, and has a strong practical assembly process. It can be widely promoted and applied to high-power brushless motors. By increasing the number of branches, the cross-sectional area of the wire is equivalently increased to meet the power requirements, and the electrical load and current density can be reduced.
[0068] In some preferred embodiments, the first power input connector 12 and the first wire connector 11 can be arranged on the outer ring of the first conductive ring 10 and extend outward. The second power input connector 22 and the second wire connector 21 can be arranged on the outer ring of the second conductive ring 20 and extend outward. The third power input connector 32 and the third wire connector 31 can be arranged on the outer ring of the third conductive ring 30 and extend outward. The first power input connector 12, the second power input connector 22, the third power input connector 32, the first wire connector 11, the second wire connector 21 and the third wire connector 31 are arranged without overlapping in space, and can be relatively arranged with reference to the position of each phase winding of the stator to avoid overlapping affecting the routing.
[0069] In some preferred embodiments, the first wire connector 11, the second wire connector 21 and the third wire connector 31 may all be provided with placement grooves. The placement grooves are mainly used for welding wires to prevent the wires from moving and facilitate welding.
[0070] The first conductive ring 10 may be provided with at least one first fixing component 13, which may be provided on the first wire connector 11 and extended toward the stator. The first conductive ring 10 may be installed on the stator with a preset slot through the first fixing component 13.
[0071] The second conductive ring 20 may be provided with at least two second fixing components 23, which may be provided on the second wire connector 21 and extended toward the stator. The second conductive ring 20 may be installed on the stator with a preset slot through the second fixing components 23.
[0072] The third conductive ring 30 may be provided with at least three third fixing components 33, which may be provided on the third wire connector 31 and extended toward the stator. The third conductive ring 30 may be installed on the stator with a preset slot through the third fixing components 33.
[0073] like Figure 5 As stated, Figure 5 A schematic structural diagram of a connection hole provided in an embodiment of the present application is shown.
[0074] In some preferred embodiments, the first power input connector 12, the second power input connector 22 and the third power input connector 32 may be provided with connection holes. The connection holes are mainly used for stable contact and connection with the input power, and the input power may be connected to the first power input connector 12, the second power input connector 22 and the third power input connector 32 respectively through a conductive long metal strip or a conductive metal clamp.
[0075] In some preferred embodiments, the first insulating member and the second insulating member may be replaced by independently providing plastic wrapping for the first conductive ring 10, the second conductive ring 20 and the third conductive ring 30 to achieve an insulation effect, but this may affect the heat dissipation of the conductive rings.
[0076] Embodiment 2:
[0077] like Figure 5 As shown, Figure 5 The schematic diagram of the structure of the motor stator provided in the embodiment of the present application is shown. The stator at least comprises an iron core 02, a three-phase winding and a three-phase conductive ring device 01 as described in the first embodiment.
[0078] Please combine Figure 6 , Figure 6 A top view of a motor stator provided in an embodiment of the present application is shown.
[0079] The three-phase conductive ring device 01 is arranged on one side of the iron core 02, and is arranged opposite to the winding output end. The output end of each phase winding is respectively connected to the first wire connector 11 of the first conductive ring 10, the second wire connector 21 of the second conductive ring 20, and the third wire connector 31 of the third conductive ring 30, and each wire connector realizes symmetrical slot parallel connection.
[0080] Embodiment three:
[0081] An embodiment of the present application provides a motor, comprising at least the three-phase conductive ring device 01 as described in the first embodiment, or the motor stator f as described in the second embodiment.
[0082] The serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A three-phase conductive ring device, arranged on a motor stator, characterized in that: include: A first conductive ring (10) is provided with a first power input connector (12) connected to an input power source and two first wire connectors (11) used to connect to a first single-phase winding wire of a stator to increase the number of winding parallel branches; A second conductive ring (20) is provided with a second power input connector (22) connected to an input power source and two second wire connectors (21) used to be connected to a stator second single-phase winding wire to increase the number of winding parallel branches; A third conductive ring (30) is provided with a third power input connector (32) connected to an input power source and two third wire connectors (31) used to be connected to a third single-phase winding wire of a stator to increase the number of winding parallel branches; A first insulating sheet (40) stacked between the first conductive ring (10) and the second conductive ring (20); A second insulating sheet (41) is stacked between the second conductive ring (20) and the third conductive ring (30).
2. The three-phase conductive ring device according to claim 1, characterized in that: The first power input connector (12) and the first wire connector (11) are arranged on the outer ring of the first conductive ring (10) and extend outward; the second power input connector (22) and the second wire connector (21) are arranged on the outer ring of the second conductive ring (20) and extend outward; the third power input connector (32) and the third wire connector (31) are arranged on the outer ring of the third conductive ring (30) and extend outward; the first power input connector (12), the second power input connector (22), the third power input connector (32), the first wire connector (11), the second wire connector (21) and the third wire connector (31) are arranged to be non-overlapping in space.
3. The three-phase conductive ring device according to claim 1, characterized in that: The first wire connector (11), the second wire connector (21) and the third wire connector (31) are all provided with placement grooves for welding wires.
4. The three-phase conductive ring device according to claim 1, characterized in that: The first power input connector (12), the second power input connector (22) and the third power input connector (32) are all provided with connection holes for stably contacting and connecting with the input power.
5. The three-phase conductive ring device according to claim 2, characterized in that: The first conductive ring (10) is provided with at least one first fixing component (13), and the first fixing component (13) is arranged to extend in the direction of the stator.
6. The three-phase conductive ring device according to claim 5, characterized in that: The second conductive ring (20) is provided with at least one second fixing component (23), and the second fixing component (23) is arranged to extend in the direction of the stator.
7. The three-phase conductive ring device according to claim 6, characterized in that: The third conductive ring (30) is provided with at least one third fixing component (33), and the third fixing component (33) is arranged to extend in the direction of the stator.
8. The three-phase conductive ring device according to claim 7, characterized in that: The first fixing component (13) is arranged on the first wire connecting member (11); the second fixing component (23) is arranged on the second wire connecting member (21); and the third fixing component (33) is arranged on the third wire connecting member (31).
9. A motor stator, characterized in that it comprises at least an iron core, a three-phase winding and a three-phase conductive ring device as claimed in any one of claims 1 to 8; The three-phase conductive ring device is arranged on one side of the iron core, opposite to the winding output end; each phase winding output end is respectively connected to a first wire connector (11) of the first conductive ring (10), a second wire connector (21) of the second conductive ring (20), and a third wire connector (31) of the third conductive ring (30).
10. A motor, characterized in that: At least comprises the three-phase conductive ring device as described in any one of claims 1 to 8, or the motor stator as described in claim 9.