Cast copper rotor high-speed alternating-current variable-frequency asynchronous motor

Abstract

The utility model discloses a cast copper rotor high-speed alternating current frequency conversion asynchronous motor, which relates to the technical field of motors, and comprises a shell, a rotor is rotatably connected in the shell, and a stator matched with the rotor is assembled in the shell; the rotor and the connecting flange are fixedly assembled at the side end of the shell, the rotor is a cast copper rotor, a rotating shaft on the rotor is a hollow shaft, the rotating shaft on the rotor is a non-standard double-output shaft, the cast copper rotor design is adopted, the excellent conductive performance that copper materials are about 40% higher than aluminum materials is fully utilized, the total loss of the motor is obviously reduced, and the service life of the motor is prolonged. Therefore, the overall operation efficiency of the motor is greatly improved, reduction of loss means that part of energy converted into heat energy is greatly reduced, the working temperature of a rotor winding coil and a stator winding coil is directly promoted to be reduced, and due to the temperature reduction effect, the service life of the motor is greatly prolonged, and the maintenance cost and frequency are remarkably reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and more specifically to a high-speed AC variable-frequency asynchronous motor with a cast copper rotor. Background Art

[0002] A medical centrifuge, also known as a medical centrifuge, is a device widely used in medical testing and biological research. It primarily uses centrifugal force generated by high-speed rotation to separate different components in mixed liquids, such as serum, plasma, cells, and proteins. A medical centrifuge primarily consists of a main unit, rotor, and sample tubes. The main unit, which includes the power supply, control circuitry, and protection circuitry, is the core of the centrifuge. The rotor is the main working part of the centrifuge and is typically available in two types: horizontal and vertical. When the centrifuge is operating, the rotor rotates at high speed, generating centrifugal force that separates different substances in the sample based on their mass, density, and sedimentation coefficient. Larger substances are thrown to the bottom of the centrifuge tube, while lighter substances float to the top. By adjusting the centrifuge's speed and centrifugal force field, precise separation of different substances can be achieved.

[0003] Currently, the traditional cast aluminum asynchronous motors used in medical centrifuges are large and have heavy rotors. Limited by their heavy shaft design, they face significant rotational inertia challenges at high speeds. This directly impacts the device's ability to quickly start up, making it difficult to reach the desired speed in a short period of time. Furthermore, during centrifugal operation, traditional cast aluminum motors exhibit poor slot-pole coordination, resulting in large harmonic coefficients, a low power factor, low overall efficiency, and a tendency to generate significant operating noise. The motor speed cannot be monitored and adjusted in real time, resulting in a simple, single-mode centrifuge operation and low efficiency. To address this issue, we propose a high-speed AC variable-frequency asynchronous motor with a cast copper rotor.

[0004] The above information disclosed in this background technology is only used to increase the understanding of the background technology of the present invention. Therefore, it may include information that does not constitute the prior art known to ordinary technicians in this field. Utility Model Content

[0005] In order to solve the problems raised in the above background technology, the utility model provides a high-speed AC variable-frequency asynchronous motor with a cast copper rotor.

[0006] The utility model provides a cast copper rotor high-speed AC variable frequency asynchronous motor adopts the following technical solutions:

[0007] A high-speed AC variable-frequency asynchronous motor with a cast copper rotor comprises a housing, a rotor rotatably connected to the interior of the housing, a stator adapted to the rotor assembled inside the housing, and a connecting flange fixedly assembled on a side end of the housing.

[0008] Preferably, the rotor is a cast copper rotor.

[0009] Preferably, the rotating shaft is a hollow shaft.

[0010] Preferably, the rotating shaft on the rotor is a non-standard dual output shaft.

[0011] Preferably, the connecting flange is a non-standard flange interface.

[0012] Preferably, the slot pole of the rotor has twenty-two slots, and the slot pole of the stator has twenty-one slots.

[0013] Preferably, a speed sensor is provided at the non-driving end of the rotor.

[0014] In summary, the present invention has the following beneficial technical effects:

[0015] 1. This motor utilizes a cast copper rotor design, leveraging copper's superior electrical conductivity, which is approximately 40% higher than aluminum. This significantly reduces total motor losses, significantly improving the motor's overall operating efficiency. This reduction in losses also means a significant reduction in the amount of energy converted into heat, directly lowering the operating temperature of the rotor and stator windings. This cooling effect not only significantly extends the motor's lifespan but also significantly reduces maintenance costs and frequency. More importantly, the lower operating temperature allows the use of a smaller fan during motor operation, or in some cases, eliminates the need for a fan altogether. This improvement not only reduces friction and air resistance losses associated with additional components, but also further reduces vibration and noise levels, further enhancing motor efficiency and providing users with a quieter, more efficient, and more durable experience.

[0016] 2. The motor uses a hollow shaft, which reduces the weight of the rotor shaft and the shaft's moment of inertia. This allows the motor to quickly complete the set test tasks at high speeds. For example, high-quality serum separation and tissue fluid component stripping can be achieved, and then the next set of test tasks can be carried out after entering the waiting period.

[0017] 3. The motor features a non-standard dual output shaft and non-standard flange interface design. This unique configuration ensures precise connection with the balanced load platform and speed sensor, thereby establishing a highly accurate speed closed-loop control system. This system not only ensures stable power transmission, but also monitors and precisely adjusts the motor speed in real time, ensuring that all operations are carried out under optimal conditions.

[0018] 4. The motor adopts a specific stator and rotor slot-pole matching ratio (21 / 22), which results in short stator winding ends, high winding coefficient, small harmonics, low noise, and small resonance area. The motor can run smoothly in low speed, medium speed, high speed and full speed range.

[0019] 5. The stator of the motor is also equipped with the stator punching of the motor (such as Figure 4 ), the stator punching sheet is preferably designed to be pear-shaped slot, so that it can be quickly processed and manufactured by a single-slot cutting die; and the stator core required by the motor (such as Figure 5 ), the stator core adopts high temperature argon arc welding technology, and the entire stator punching core is welded into one along the 8 slots reserved on the outer circle. The stacking coefficient reaches 0.98, forming a rigid integral structure; the rotor is also equipped with rotor punchings (such as Figure 6 ), the rotor punching is preferably designed into a "belly" slot by simulating the motor performance, so that it can be quickly processed and manufactured through a customized single-slot cutting mold, and better electromagnetic performance can be obtained; and the rotor core required by the motor (such as Figure 7 ), during the pressure-maintaining casting process of high-temperature molten copper, the bottom of the slot can be cooled quickly without generating cold shut and bubbles, thus avoiding broken bars and ensuring the yield rate.

[0020] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of a high-speed AC variable-frequency asynchronous motor with a cast copper rotor in Example 1 of the present utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of a high-speed AC variable-frequency asynchronous motor with a cast copper rotor in Example 1 of the present utility model;

[0023] Figure 3 This is a schematic structural diagram of the connecting flange in Example 1 of the present utility model;

[0024] Figure 4 This is a structural diagram of the front end of a high-speed AC variable-frequency asynchronous motor with a cast copper rotor in the first embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the stator punching structure of a high-speed AC variable-frequency asynchronous motor with a cast copper rotor in the first embodiment of the present utility model;

[0026] Figure 6This is a schematic diagram of the stator core structure of a high-speed AC variable-frequency asynchronous motor with a cast copper rotor in Example 1 of the present utility model;

[0027] Figure 7 This is a schematic diagram of the rotor punching structure of a high-speed AC variable-frequency asynchronous motor with a cast copper rotor in the first embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the rotor core structure of a high-speed AC variable-frequency asynchronous motor with a cast copper rotor in Example 1 of the present utility model;

[0029] Figure 9 This is a schematic structural diagram of the shielding cover in the second embodiment of the present utility model;

[0030] Figure 10 This is a schematic structural diagram of the heat dissipation mechanism in the second embodiment of the present utility model;

[0031] Figure 11 It is a structural schematic diagram of the connecting flange and the connecting sleeve in the second embodiment of the present utility model.

[0032] Explanation of the accompanying drawings: 1. Housing; 2. Rotor; 3. Connecting flange; 4. Heat dissipation mechanism; 400. Vertical pole; 401. Heat sink; 5. Shielding cover; 6. Connecting hole; 7. Limiting groove; 8. Connecting sleeve. DETAILED DESCRIPTION

[0033] The following is combined with Figures 1 to 11 The utility model is described in further detail.

[0034] It should be noted that the drawings are schematic and not drawn to scale. For clarity and convenience, the relative sizes and proportions of parts shown in the drawings may be exaggerated or reduced in size. Any dimensions are illustrative only and are not intended to be limiting. Identical structures, elements, or components appearing in two or more drawings are denoted by the same reference numerals to indicate similar features.

[0035] Example 1

[0036] The present invention discloses a high-speed AC variable frequency asynchronous motor with a cast copper rotor. Figures 1 to 8 A cast copper rotor high-speed AC variable-frequency asynchronous motor includes a shell 1, a rotor 2 is rotatably connected to the inside of the shell 1, and a stator adapted to the rotor 2 is assembled inside the shell 1; a connecting flange 3 is fixedly assembled on the side end of the shell 1.

[0037] Specifically, Rotor 2 is a cast copper rotor. By adopting a cast copper rotor design, it fully utilizes the excellent electrical conductivity of copper, which is approximately 40% higher than that of aluminum, achieving a significant reduction in the total losses of the motor, thereby significantly improving the overall operating efficiency of the motor. At the same time, the reduced losses also mean that the portion of energy converted into heat energy is greatly reduced, directly leading to a decrease in the operating temperature of the rotor and stator winding coils. This temperature drop effect not only greatly extends the service life of the motor, but also significantly reduces maintenance costs and frequency. More importantly, the lower operating temperature allows the motor to use a smaller fan during operation, and in some cases, even eliminate the fan design entirely. This improvement not only reduces the friction loss and air resistance loss of additional parts, but also further reduces vibration and noise levels, thereby achieving a further increase in motor efficiency, providing users with a quieter, more efficient, and durable user experience.

[0038] Specifically, the shaft on rotor 2 is hollow. This reduces the weight and moment of inertia of the rotor shaft, allowing the motor to quickly complete the desired test tasks at high speeds. For example, high-quality serum separation and tissue fluid component stripping can be achieved, before the next set of test tasks can be performed.

[0039] Specifically, the rotating shaft on rotor 2 is a non-standard dual-output shaft. As you can see, connecting flange 3 is a non-standard flange interface. This unique configuration ensures precise connection with the balanced load platform and speed sensor, thereby establishing a highly accurate closed-loop speed control system. This system not only ensures stable power transmission but also monitors and precisely adjusts the motor speed in real time, ensuring that all operations are performed at optimal conditions.

[0040] Specifically, the slot pole of the rotor 2 is twenty-two slots, and the slot pole of the stator is twenty-one slots. It can be understood that such a preferred stator winding end is short, the winding coefficient is high, the harmonics are small, the noise is low, the resonance area is small, and the motor can run smoothly in the low speed section, the medium speed section, the high speed section and the full speed range.

[0041] Specifically, the stator is also equipped with the stator punching of the motor (such as Figure 4 );

[0042] The stator punching sheets are preferably designed with pear-shaped slots to facilitate rapid processing and production using a single-slot cutting die.

[0043] And the stator core required by the motor (such as Figure 5 ), the stator core adopts high-temperature argon arc welding technology to weld the entire stator core into one piece along the 8 slots reserved on the outer circle, with a stacking coefficient of 0.98, forming a rigid overall structure;

[0044] The rotor 2 is also equipped with rotor punchings (such as Figure 6 );

[0045] The rotor punchings are optimally designed with "belly" grooves by simulating motor performance, so that they can be quickly processed and manufactured using a customized single-slot cutting die, and achieve better electromagnetic performance;

[0046] And the rotor core required by the motor (such as Figure 7 ), during the pressure-maintaining casting process of high-temperature molten copper, the bottom of the slot can be cooled quickly without generating cold shut and bubbles, thus avoiding broken bars and ensuring the yield rate.

[0047] It should be noted that the non-driving end of rotor 2 is equipped with a speed sensor, which forms a closed-loop speed control with the control system, and provides real-time feedback on the motor speed in order to adjust the system speed output.

[0048] Example 2

[0049] Reference Figures 9 to 11 A cast copper rotor high-speed AC variable-frequency asynchronous motor also includes a heat dissipation mechanism 4. The heat dissipation mechanism 4 includes multiple groups of vertical poles 400 fixed to the housing 1. The number of vertical poles 400 in each group is two and they are arranged horizontally. A plurality of heat sinks 401 are fixed between the two horizontally arranged vertical poles 400. The heat sinks 401 are arranged at equal intervals. The heat generated by the motor during operation can be transferred to the heat sink 401 through each vertical pole 400, and then diffused into the air by the heat sink 401, thereby achieving the effect of heat dissipation and protecting the motor.

[0050] Specifically, the heat sink 401 is arc-shaped, and the vertical rods 400 are arranged in a circular array on the housing 1. This design can evenly transfer heat energy to the housing 1.

[0051] Specifically, the uprights 400 are heat pipes, which are highly efficient heat transfer elements that transfer heat from one end of the motor to the other. By installing heat pipes within the motor, rapid and effective heat dissipation can be achieved. Heat pipe cooling offers fast and efficient heat dissipation, a compact structure, and lightweight design.

[0052] Specifically, a shielding cover 5 is fixedly installed on the side of the connecting flange 3, the heat dissipation mechanism 4 is arranged in the shielding cover 5, and the outer side of the shielding cover 5 is a hollow structure. By setting the shielding cover 5, each vertical pole 400 and the heat sink 401 can be wrapped for protection. At the same time, the shielding cover 5 is a hollow structure and will not affect the heat diffusion of the heat sink 401.

[0053] The heat generated by the motor during operation can be transferred to the heat sink 401 through each upright pole 400, and then diffused into the air by the heat sink 401, thereby achieving the effect of heat dissipation and protecting the motor. By setting up a shielding cover 5, each upright pole 400 and the heat sink 401 can be wrapped for protection. At the same time, the shielding cover 5 is a hollow structure and will not affect the heat diffusion of the heat sink 401. This structural design not only ensures that the motor can quickly release the accumulated heat when running under high load, but also greatly improves the stability and durability of operation, and realizes the rapid dispersion and discharge of heat, effectively avoiding the occurrence of overheating, and providing a solid guarantee for the continuous and stable power output of the motor. At the same time, the shielding cover 5 can protect the heat dissipation mechanism 4 to avoid damage to the heat dissipation mechanism 4.

[0054] Specifically, a plurality of connecting holes 6 are provided on the side of the connecting flange 3, a limiting groove 7 is provided in the connecting hole 6, and a connecting sleeve 8 is inserted into the connecting hole 6 (the connecting sleeve 8 is designed with a variety of different types of apertures, which can be selected according to the size of the connecting bolts or screws). The outer side of the connecting sleeve 8 is connected to the limiting groove 7 through a limiting pad. When installing the motor, the connecting sleeve 8 can be inserted into the connecting hole 6, and then the connecting flange 3 can be fixed to the external equipment with screws to complete the installation of the motor. By designing the connecting sleeve 8 and the connecting flange 3 to be detachable, different types of bolts can be adapted, and when the connecting sleeve 8 is damaged, it can be replaced without replacing the connecting flange 3.

[0055] The standard parts used in this utility model can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0056] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. "Multiple" means two or more, unless otherwise specifically defined.

[0057] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0058] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0060] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0061] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-speed AC variable-frequency asynchronous motor with a cast copper rotor, characterized in that: include: A housing (1), wherein a rotor (2) is rotatably connected to the interior of the housing (1), and a stator adapted to the rotor (2) is assembled inside the housing (1); The connecting flange (3) is fixedly assembled on the side end of the housing (1).

2. The high-speed AC variable-frequency asynchronous motor with a cast copper rotor according to claim 1, characterized in that: The rotor (2) is a cast copper rotor.

3. The high-speed AC variable-frequency asynchronous motor with a cast copper rotor according to claim 1, characterized in that: The rotating shaft on the rotor (2) is a hollow shaft.

4. The high-speed AC variable-frequency asynchronous motor with a cast copper rotor according to claim 1, characterized in that: The rotating shaft on the rotor (2) is a non-standard double output shaft.

5. The high-speed AC variable-frequency asynchronous motor with a cast copper rotor according to claim 1, characterized in that: The connecting flange (3) is a non-standard flange interface.

6. The high-speed AC variable-frequency asynchronous motor with a cast copper rotor according to claim 1, characterized in that: The slot pole of the rotor (2) has twenty-two slots, and the slot pole of the stator has twenty-one slots.

7. The high-speed AC variable-frequency asynchronous motor with a cast copper rotor according to claim 1, characterized in that: A speed sensor is provided at the non-driving end of the rotor (2).

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