Patent Application
20230396123
The present disclosure belongs to the technical field of rotor structure design, and particularly relates to a rotor structure for reducing a working temperature in a shaft.
When a motor is working, it will generate heat. The heat generation will be more serious especially when the air gap between the stator and rotor is small, the power voltage is higher, or the bearings works in an abnormal state, etc. If the motor works in a harsh environment for a long time, the heat cannot be dissipated in time, and the motor may not work normally. Moreover, if the temperature inside the rotor is too high, the permeability will drop, which will adversely affect the torque output of the motor.
In view of the above problems, the present disclosure provides a motor rotor structure that can reduce the working temperature in the shaft to overcome the above problems or at least partially solve the above problems.
To achieve the object, the present disclosure adopts the following technical solutions.
An aspect of the present disclosure provides a rotor structure for reducing a working temperature in a shaft, wherein the rotor structure comprises a hollow shaft body and an inner shaft sleeve, the inner shaft sleeve is assembled in the hollow shaft body, and a first thermal insulating cavity is formed between the inner shaft sleeve and the hollow shaft body.
Optionally, the first thermal insulating cavity is in a vacuum state, filled with air or filled with a thermal insulating medium.
Optionally, the hollow shaft body and/or the inner shaft sleeve are/is (a) cylindrical hollow structure(s).
Optionally, ends of the hollow shaft body and ends of the inner shaft sleeve are sealedly connected therebetween.
Optionally, the sealed connection is interference fit, welding or threaded connection.
Optionally, the hollow shaft body and the inner shaft sleeve are made of metallic or non-metallic materials.
The present disclosure also provides another rotor structure for reducing a working temperature in a shaft, wherein the rotor structure comprises a hollow shaft body and a rotor iron core, the rotor iron core is sleeved on the hollow shaft body, and a second thermal insulation cavity is formed between the rotor iron core and the hollow shaft body.
Optionally, the second thermal insulating cavity is in a vacuum state, filled with air or filled with a thermal insulating medium; and the second thermal insulating cavity is formed by a groove structure provided on an inner surface of the rotor iron core and/or an outer surface of the hollow shaft body.
Optionally, the hollow shaft body and the rotor iron core are coupled through multiple keys to transmit torque.
The present disclosure also provides still another rotor structure for reducing a working temperature in a shaft, wherein the rotor structure comprises a hollow shaft body, an inner shaft sleeve and a rotor iron core, the inner shaft sleeve is assembled in the hollow shaft body, and the rotor iron core is sleeved on the hollow shaft body;
The advantages and beneficial effects of the present disclosure are as follows.
The rotor structures are applied to the motor. By providing the first and/or second thermal insulating cavity, the working temperature of the inner surface of the hollow shaft of the motor can be effectively reduced, thereby ensuring the reliable operation of the motor.
By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to a person of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiments, and should not be considered as a limitation to the present disclosure. Moreover, throughout the drawings, the same reference numerals are used to denote the same components. In the drawings:
In the drawings: 1, hollow shaft body; 2, inner shaft sleeve; 3, first thermal insulating cavity; 4, rotor iron core; 5, second thermal insulating cavity; 6, key.
In order to make the object, technical solutions, and advantages of the present disclosure clearer, the present disclosure will be described clearly and completely in conjunction with the specific embodiments and corresponding drawings. Obviously, the embodiments described are only part of, rather than all of, the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without paying creative work shall fall within the protection scope of the present disclosure.
It should be understood that the terms “comprise/include”, “consist of” or any other variants are intended to cover non-exclusive inclusion, so that the product, apparatus, process or method including a series of elements may not only include those elements, but also include other elements not stated explicitly, or elements inherent to the product, apparatus, process or method. Without more limitations, elements defined by the phrase “comprise/include” or “consist of” does not exclude the case that there are other same elements in the product, apparatus, process or method including the elements.
It should also be understood that, orientation or positional relationship indicated by the terms “upper”, “lower”, “front”, “rear”, “left”, “right”, “top”, “bottom”, “inner”, “outer”, etc. are orientation or positional relationship based on the drawings, which are merely for convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the relevant device, component or structure must have a specific orientation, or must be constructed and operated in a specific orientation, they should not be construed as limiting the present disclosure.
In the present disclosure, unless otherwise expressly specified and defined, the terms “installed”, “coupled”, “connected”, “fixed” and the like should be understood in a broad sense, for example, it may be fixedly connected, or removably connected, or integrally connected; it may also be mechanically connected or electrically connected; it may also be directly connected or indirectly connected through a middleware; it may also be internally communicated or interacted between two components. For a person of ordinary skill in the art, the specific meaning of these terms in the present disclosure should be understood according to specific situations.
The technical solutions provided by the embodiments of the present disclosure are described in detail with the accompanying drawings.
As can be seen from
In an embodiment, the first thermal insulating cavity 3 is in a vacuum state, filled with ordinary air or filled with a thermal insulation medium. The thermal insulation medium may be inert gas, liquid or solid material that have a low thermal conductivity. The specific volume and filling material are not specifically limited here.
In an embodiment, referring to
In an embodiment, in order to maintain the vacuum state or prevent the thermal insulating medium in the first thermal insulating cavity 3 from leaking out and polluting the motor and reducing the thermal insulation effect, ends of the hollow shaft body and ends of the inner shaft sleeve are sealedly connected therebetween. The specific form of the sealed connection may not be limited.
Preferably, the sealed connection is any one of the following: interference fit, welding, or threaded connection with an end cover. The purpose is to block the communication between the thermal insulating cavity and the external space.
In an embodiment, the hollow shaft body 1 and the inner shaft sleeve 2 are made of metallic or non-metallic materials. The specific selection of metallic and non-metallic materials is not specifically limited, as long as the strength and hardness requirements are met.
Referring to
In an embodiment, for the same reason as the first thermal insulating cavity, the second thermal insulating cavity 5 is in a vacuum state, filled with air or filled with a thermal insulating medium.
In an embodiment, the second thermal insulating cavity 5 is formed by a groove structure provided on an inner surface of the rotor iron core 4 and/or an outer surface of the hollow shaft body 1. Of course, it may also be formed by a gap formed due to the difference of radius.
For other settings of the second thermal insulating cavity, please refer to the setting of the first thermal insulating cavity in the first embodiment.
It should be pointed out that, referring to
The third embodiment is the combination of the first embodiment and the second embodiment. The rotor structure for reducing the working temperature in the shaft in this embodiment comprises a hollow shaft body 1, an inner shaft sleeve 2 and a rotor iron core 4. The inner shaft sleeve 2 is assembled in the hollow shaft body 1, and the rotor iron core 4 is sleeved on the hollow shaft body 1. A first thermal insulating cavity 3 is formed between the inner shaft sleeve 2 and the hollow shaft body 1. A second thermal insulating cavity 5 is formed between the rotor iron core 4 and the hollow shaft body 1. The thermal insulation effect is further improved by providing two thermal insulating cavities.
For the specific settings of the first and second thermal insulating cavities, please refer to the first embodiment and the second embodiment, which will not be repeated here.
The above only describes the embodiments of the present disclosure and is not intended to limit the scope of protection of the present disclosure. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present disclosure shall all be included in the protection scope of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202120011514.2 | Jan 2021 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2021/097172 | 5/31/2021 | WO |
