Mute and efficient microwave oven stirring blade direct drive motor and directional self-starting method

Abstract

The invention belongs to the technical field of motors, and particularly relates to a mute and efficient microwave oven stirring blade direct drive motor and a directional self-starting method.The mute and efficient microwave oven stirring blade direct drive motor comprises a frame assembly, a stator disc, a charge exchange cylinder, a rotor disc, a rotating shaft and stirring blades; positive and negative electrode exchange electrodes are arranged on the outer side of the circumference of the charge exchange cylinder, a plurality of electrode plates are arranged on the rotor disc in the radial direction, tail parts are arranged at the tail ends of the electrode plates to achieve directional self-starting, and the rotor disc and the stator disc are alternately stacked and arranged and drive the stirring blades to rotate through the rotating shaft. The static motor is used for directly driving the low-speed light load, stable low-speed output can be achieved without a speed reducer, the operation power consumption is lower than 20 milliwatts, the energy efficiency is high, the driving process is almost noiseless, meanwhile, the current is automatically reduced to be close to zero in the locked-rotor process, motor damage is avoided, the overall structure is compact and reliable, and the device is suitable for efficient mute driving of the microwave oven stirring blade.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric machines, and particularly relates to a reducer-free, silent and high-efficiency microwave oven stirring blade direct-drive motor and a directional self-starting method. BACKGROUND

[0002] With the rapid development of modern household appliance technology, as a widely used electrical appliance in household and commercial kitchens, the function and performance of microwave ovens are continuously optimized and improved. In the operation process of a microwave oven, in order to achieve uniform heating of food, a microwave stirring blade or a rotating tray is usually provided as an important component for uniformly distributing microwave energy inside. The stirring blade generally needs to rotate stably at a low speed to improve the propagation state of microwaves in the oven cavity, thereby avoiding local overheating or uneven heating and ensuring the uniformity of food heating and user experience.

[0003] Existing microwave ovens generally use a motor as the driving source of the stirring blade, among which an electromagnetic motor is the most common type. This type of motor obtains a larger output power through high-speed rotation, and then reduces the speed through a reducer to meet the low-speed requirement of the stirring blade. This design can maintain stable driving in medium and high load scenarios, but has a more prominent deficiency in the light load application of microwave stirring blades. The combination of the motor and the reducer brings problems of energy waste, high noise and low efficiency while achieving low-speed output.

[0004] Specifically, the working characteristics of the electromagnetic motor determine that its optimal efficiency point is usually in the high-speed running interval, while the microwave stirring blade only needs to rotate at a low speed of dozens of revolutions per minute. Therefore, a gear reduction device must be used for speed reduction and torque increase. In this process, a large amount of energy is consumed in gear friction, meshing loss and internal loss generated by the motor deviating from the high-efficiency interval, resulting in a significant decrease in the overall system energy efficiency. Especially under light load conditions, the actual torque provided by the motor is much larger than the load demand, and the output power cannot be effectively utilized, causing energy waste and low running efficiency.

[0005] In addition, the electromagnetic motor produces a large noise when running at high speed with a reduction gear. Gear meshing and motor internal friction are important sources of noise. This problem is particularly prominent in household appliances. As a high-frequency kitchen device, the noise level of a microwave oven directly affects the user experience. Especially at night or in a quiet environment, high operating noise can easily cause discomfort, thereby limiting the further optimization space of the existing motor reducer solution in household appliance applications.

[0006] Moreover, the speed reducer itself has a complex structure, and there are problems such as gear wear, lubrication maintenance, etc. After a long time of use, it is easy to appear efficiency decline and failure risk, which increases the maintenance cost and product failure rate. At the same time, in the case of too large reduction ratio, the transmission efficiency loss can reach 10% to 40%, which seriously restricts the overall performance of the motor under light load and low speed working condition. On the other hand, when the electromagnetic motor directly drives the low-speed load, the current increases sharply and the heat generation is large due to the deviation from the optimal efficiency interval, and even there is a risk of overheating and burning, so additional cooling measures and overload protection design are needed. This not only increases the system complexity, but also increases the manufacturing cost and use risk.

[0007] An electrostatic motor is a kind of device that realizes mutual conversion between electrical energy and mechanical energy based on electrostatic force. Its basic principle is to drive the rotor to move relative to the stator by the Coulomb force generated by the electric field between the electrodes, or to realize electrical energy output by cutting the electric field with the relative motion of the rotor. Compared with the traditional electromagnetic motor which relies on electromagnetic force for driving, the electrostatic motor has unique advantages such as simple structure, high energy conversion efficiency at low speed, no current loss in locked rotor state, etc. It has been regarded as a useful supplement to electromagnetic motors for a long time. The electrostatic motor converts electrostatic energy into mechanical energy through the process of capacitor charging and discharging. Its output torque is related to the input power condition, and it can maintain constant torque characteristics when the speed changes. This makes it unnecessary to use a reducer to directly drive low-speed and light-load loads. In theory, it is very suitable for application scenarios such as microwave stirring blades that are low-speed, light-weight and stable rotation. The electrostatic torque output by the electrostatic motor is related to the size of the electrostatic force. The working characteristic curves of the electrostatic motor (a, left side) and the electromagnetic motor (b, right side) are shown in Figure 7 As shown in the figure, the current of the electrostatic motor is very low when running at low speed, and the power consumption can be controlled below milliwatt level, which significantly improves the energy efficiency compared with the electromagnetic motor. And because the load and the motor are both running at low speed, almost no mechanical noise is generated during operation, which can significantly improve the user experience.

[0008] However, the existing brushless electrostatic motor still has the following problems in specific application: First, its start depends on the rotor electrode approaching the charge exchange cylinder electrode to obtain electric charge. Because the rotor electrodes need to maintain a certain distance to avoid breakdown, if the charge exchange cylinder electrode is located in the middle position of the rotor electrode, the rotor electrode cannot be charged by the corona, which makes it impossible to rotate. This makes the motor have a starting dead point when the rotor electrode is between the charge exchange cylinder electrodes, which cannot obtain electric charge and cannot start. This problem seriously affects the reliable starting performance of the electrostatic motor.

[0009] Second: The rotation direction of existing brushless electrostatic motors is uncontrollable during startup, which is a significant drawback for applications such as microwave oven stirrers that require directional rotation. If the rotation direction of the stirrer cannot be kept consistent, it will directly affect the distribution of microwave energy in the oven cavity, thereby reducing heating uniformity and affecting the heating effect of the food.

[0010] In summary, while existing microwave oven stirrer drive solutions using electromagnetic motors and reducers can drive the load to rotate, they suffer from low energy efficiency, high noise, complex structure, and limited lifespan. While electrostatic motors demonstrate high efficiency and quiet operation potential in low-speed, light-load applications, their brushless structure limits their ability to start and directional rotation, hindering their widespread application in microwave ovens and other applications requiring stable and reliable drive. Therefore, addressing the issues of self-starting dead point and uncontrollable rotation direction in electrostatic motors while ensuring low-speed drive capability has become a pressing technical challenge in this field. Summary of the Invention

[0011] The present invention aims to solve at least one of the following problems in the prior art: microwave oven stirring blades are usually driven by high-speed electromagnetic motors and reducers, which have problems such as low energy conversion efficiency, high noise, high power consumption and risk of stalling.

[0012] In view of this, the present invention provides a microwave oven stirrer blade direct drive motor and directional self-starting method that is gearless, quiet and efficient. Based on the characteristics of light and low-speed load use, the present invention discloses a stirrer blade drive motor with simple structure, extremely low power consumption, stable operation and self-starting and anti-stall advantages. It can achieve quiet and efficient drive without the need for a gear reducer, and achieves the comprehensive effects of improving energy efficiency, reducing noise, extending life and ensuring safety.

[0013] The first objective of this application is to disclose a quiet and efficient microwave oven stirrer direct drive motor, comprising: Frame components, used to support the functional parts of the motor; The stator disk, disposed within the frame assembly, includes a stator plate and alternating negative and positive conductive plates thereon, used to form a uniform and stable electric field when an external power source is connected. The rotor disk, which is stacked alternately with the stator disk, includes a rotor plate and a plurality of radially arranged electrode plates. Each electrode plate has a tail at the end of its outer edge. The tail is used to preferentially enter the charge area during operation and maintain the charge to ensure that the rotor disk rotates in a set direction. A charge exchange cylinder is arranged on the outer circumference of the stator disk, including a cylinder side plate. Negative and positive charge exchange electrodes are alternately arranged longitudinally on the cylinder side plate to provide charge to the electrode plates on the rotor disk when the motor is running. A rotating shaft passes through the stator disk and is fixedly connected to the rotor disk, and is supported on the frame assembly by bearings, for transmitting the rotation of the rotor disk to an external load; A stirring blade is fixedly connected to one end of the rotating shaft and is used to rotate stably at a low speed inside the microwave oven cavity.

[0014] In some examples of this application, a negative electrode ring and a positive electrode ring are respectively provided at opposite ends of the cylindrical side plate. The negative electrode ring is electrically connected to a plurality of negative electrode switching electrodes on the cylindrical side plate, and the positive electrode ring is electrically connected to a plurality of positive electrode switching electrodes on the cylindrical side plate. The positive electrode ring is connected to the positive terminal of the power supply, and the negative electrode ring is connected to the negative terminal of the power supply.

[0015] In some examples of this application, the stator plate of the stator disk is provided with a negative electrode conductive sheet and a positive electrode conductive sheet on the upper and lower sides respectively. The negative electrode conductive sheet and the positive electrode conductive sheet are mirror-distributed on the upper and lower sides of the stator plate. The negative electrode conductive sheet is tightly electrically connected to the negative electrode switching electrode, and the positive electrode conductive sheet is tightly electrically connected to the positive electrode switching electrode.

[0016] In some examples of this application, the positive electrode conductive sheet corresponds one-to-one with the positive electrode switching electrode, and the negative electrode conductive sheet corresponds one-to-one with the negative electrode switching electrode.

[0017] In some examples of this application, the outer edge of the stator plate is fastened to the side plate of the charge exchange cylinder by a first slot and a first buckle.

[0018] In some examples of this application, the electrode plates are provided in multiple ways and divided into group A electrodes and group B electrodes. Group A electrodes include multiple first electrode plates, and group B electrodes include multiple second electrode plates. The first electrode plates and the second electrode plates are arranged in a uniform alternating manner on the rotor plate. The first electrode plates of group A electrodes and the second electrode plates of group B electrodes are not physically directly connected and maintain the same polarity at any time.

[0019] In some examples of this application, the trailing portion is biased in the circumferential direction of the rotor disk along the extension direction of the electrode sheet, and the biasing direction of multiple trailing portions is consistent.

[0020] In some examples of this application, the rotor disk is provided with at least two layers, and the electrode plates on the two rotor disks are arranged in a staggered manner in the circumferential direction.

[0021] In some examples of this application, the quiet and efficient microwave oven stirring blade direct drive motor is a brushless structure, which can directly drive the stirring blade without a reducer when running at low speed, or it can be used in conjunction with an extremely low reduction ratio reducer with a reduction ratio of no more than 3:1 to drive the stirring blade.

[0022] The second objective of this application is to disclose a method for the directional self-starting of a quiet and efficient microwave oven stirrer direct drive motor, comprising: The electrode plates of the rotor disk are configured with a tail section; When the power is turned on, the trailing part preferentially enters the corona region of the charge exchange cylinder electrode and becomes charged; Under the electric field generated by the stator disk, if the rotor disk tends to rotate in the opposite direction, the electrode plate generates negative work when it enters the stator electrode action area, causing the rotor disk to be subjected to torque and return to the set direction. When the rotor disk rotates in the set direction, the electrode plate is at the center of action of the stator electrode when it passes the charge exchange cylinder electrode, in the negative work range, so that the rotor disk and stirring plate can start and rotate stably and continuously in the set direction.

[0023] Compared with existing technologies, the quiet and efficient microwave oven stirring blade direct drive motor and directional self-starting method described in this invention have the following advantages: 1. This application completely changes the traditional transmission mode of motors that rely on high-speed rotation and reduction mechanisms by directly driving the stirrer blade with an electrostatic motor. It directly outputs the required low-speed rotation torque, which can drive the stirrer blade to operate smoothly without significant energy loss. This design not only significantly reduces the noise of the motor during operation, but also reduces wear and tear by eliminating the mechanical reducer, thereby improving the overall lifespan and reliability. At the same time, it can achieve drive with extremely low power consumption, meeting the microwave oven's demand for high efficiency and energy saving. It will not damage the motor body in the stall state, thus providing users with a long-term stable user experience. This direct drive method not only makes the microwave oven's stirrer blade run more smoothly and quietly, but also reduces power consumption through efficient energy utilization, providing a new solution for the application of low-power drive technology in the home appliance industry.

[0024] 2. This application also enables the motor to achieve self-starting by adopting a multi-layer rotor electrode staggered arrangement and a trailing structure in the rotor design. It can automatically enter a stable rotation state after being powered on without external assistance, solving the starting difficulty problem of some electrostatic motors. This directional self-starting mechanism ensures that the stirring blade can reliably start and run continuously in each heating process, avoiding uneven heating caused by poor starting, ensuring stable low-speed rotation of the stirring blade during microwave heating, effectively avoiding local overheating or uneven stirring, further enhancing the uniformity of food heating and the quiet operation of the equipment, and promoting the application prospects of electrostatic motors in more low-speed and light-load scenarios. Attached Figure Description

[0025] Figure 1 This is a side view of the direct-drive motor for the microwave oven stirring blade according to an embodiment of the present invention; Figure 2 This is a perspective structural diagram of the direct-drive motor for the microwave oven stirring blade according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the charge exchange cylinder according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the rotor disk structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the static disk according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the upper frame plate according to an embodiment of the present invention; Figure 7 Schematic diagrams of the operating characteristic curves of electrostatic motor (a) and electromagnetic motor (b); The markings in the diagram are as follows: 1-Frame assembly; 101-Upper frame plate; 102-Lower frame plate; 2-Charge exchange cylinder; 201-Cylinder side plate; 202-Negative electrode exchanger; 203-Positive electrode exchanger; 204-Negative electrode ring; 205-Positive electrode ring; 206-First slot; 3-Stator disk; 301-Stator plate; 302-Negative conductive sheet; 303-Positive conductive sheet; 304-First buckle; 4-Rotating shaft; 5-Stirring blade; 6-Rotator disk; 601-Rotator plate; 602-Electrode sheet; 6021-First electrode sheet; 6022-Second electrode sheet; 603-Tail section; 604-First through hole; 7-Bearing. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0027] It should be noted that all directional and positional terms used in this invention, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connections between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0028] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The stirring blade used in a microwave oven to achieve uniform microwave distribution needs to rotate stably at a low speed of about 30 rpm to operate normally. It is a typical light load, and only needs to overcome its own rotational resistance and a small amount of air resistance to meet the operating requirements.

[0031] For low-speed, light-load drive scenarios, electrostatic motors have a natural advantage: their operating current is only positively correlated with speed, and the current can be stably maintained at the μA level under the target low-speed condition of 20~50rpm; and no additional boost circuit or complex control module is required, as the 4kV voltage output from the microwave oven magnetron can be directly used as the drive power supply. Under the condition of good motor insulation performance, the overall power consumption can be controlled below 20mW, and the energy conversion efficiency is significantly better than that of traditional electromagnetic motor solutions; at the same time, the electrostatic motor directly drives the rotor to rotate through the electrostatic force between the electrodes, which can match the low-speed requirements of the stirring blade without the need for a reducer, and both the load end and the motor rotor are in a low-speed operating state, avoiding noise sources such as gear meshing and high-speed rotor friction, and achieving a near-noise-free drive effect; in addition, based on the capacitor charging and discharging working principle of the electrostatic motor, when an accidental stall occurs, the charging and discharging process terminates synchronously after the rotor stops rotating. At this time, the motor consumes almost no current, which avoids the risk of overheating and burnout like electromagnetic motors, and eliminates the need to design a complex stall emergency protection structure, greatly improving the reliability and safety of the drive system.

[0032] Based on the aforementioned technical advantages of electrostatic motors in low-speed, light-load scenarios, such as Figures 1-6 As shown, this application provides a quiet and efficient microwave oven stirrer direct drive motor, comprising: Frame component 1, a functional component used to support the motor; The stator disk 3 is disposed within the frame assembly 1 and includes a stator plate 301 and alternating negative electrode conductive plates 302 and positive electrode conductive plates 303 thereon, which are used to form a uniform and stable electric field when an external power source is connected. The rotor disk 6, which is stacked alternately with the stator disk 3, includes a rotor plate 601 and a plurality of radially arranged electrode plates 602. Each electrode plate 602 has a tail 603 at the end of its outer edge. The tail 603 is used to preferentially enter the charge area during operation and maintain the charge to ensure that the rotor disk 6 rotates in a set direction. The charge exchange cylinder 2 is arranged on the outer circumference of the stator disk 3 and includes a cylinder side plate 201. Negative electrode 202 and positive electrode 203 are alternately arranged longitudinally on the cylinder side plate 201 to provide charge to the electrode plates 602 on the rotor disk 6 when the motor is running. The rotating shaft 4 passes through the stator disk 3 and is fixedly connected to the rotor disk 6, and is supported on the frame assembly 1 by the bearing 7, for transmitting the rotation of the rotor disk 6 to the external load; The stirring blade 5 is fixedly connected to one end of the rotating shaft 4 and is used to rotate stably at low speed inside the microwave oven cavity.

[0033] The quiet and efficient microwave oven stirrer direct-drive motor disclosed in this application uses a frame assembly 1 as the basic support for the overall structure, so that the internal stator disk 3, charge exchange cylinder 2, rotor disk 6, rotating shaft 4 and external stirrer 5 can fit tightly without positional displacement. This avoids the motor from shaking or deforming due to the external environment under light load, which could cause unstable operation or increased noise. The stator disk 3 uses a stator plate 301 and alternately arranged positive and negative conductive plates 303 and 302. After the external power supply is connected, it can quickly form a uniform and stable electric field and provide a stable electric field environment throughout the rotor area. The rotor disk 6 uses multiple radially arranged electrode plates 602 and a tail 603 is provided at the end of the electrode plates 602. The tail 603 can preferentially enter the charge exchange area and quickly become charged in the initial stage of operation, thereby ensuring that the rotor disk 6 obtains continuous driving torque and avoiding stagnation or reverse rotation, thus ensuring the reliability of motor self-starting. The alternating stacking structure of the rotor disk 6 and stator disk 3 ensures that the electrode plates 602 are always within the electric field range and can stably obtain electric torque. Charge is collected to ensure the continuity and stability of the rotor disk 6 rotation. The charge exchange cylinder 2 is arranged on the outer circumference of the stator disk 3, and positive and negative electrode exchangers 203 and 202 are alternately arranged longitudinally on its side plate 201. During motor operation, the charge can be periodically replenished to the electrode plates 602 of the rotor disk 6, so that the rotor disk 6 forms a stable charging and discharging cycle. This process ensures that the motor can still obtain uniform driving torque at low speed. The rotating shaft 4 passes through the stator disk 3 and is fixedly connected to the rotor disk 6. With the support of the bearing 7 and the frame assembly 1, the rotational force of the rotor disk 6 can be smoothly transmitted, reducing the energy loss of mechanical friction and thus improving operating efficiency. The output end of the rotating shaft 4 is fixedly connected to the stirring blade 5, which can keep the stirring blade 5 rotating at low speed in the microwave oven cavity, ensuring that the food can be evenly stirred during heating and avoiding uneven heating in some areas. The entire structure operates stably under light load, has low power consumption, and has reliable self-starting capability. It can achieve continuous drive at low speed, thus ensuring that the motor has a combination of high efficiency and quiet performance.

[0034] The quiet and efficient microwave oven stirrer direct-drive motor described in this application, when connected to an external power source, connects the positive and negative electrodes 203 and 202 of the charge exchange cylinder 2 to the positive and negative terminals of the external power source, respectively. Simultaneously, the positive and negative conductive plates 303 and 302 on the stator disk 3 are also connected to the positive and negative terminals of the power source, respectively. This creates an alternating electric field on the stator disk 3. The rotor disk 6 and stator disk 3 are stacked alternately, and the radially distributed electrode plates 602 on the rotor disk 6 continuously pass through the positive and negative electrodes of the charge exchange cylinder 2 as the rotor rotates. When an electrode plate 602 passes the positive electrode 203, it acquires a positive charge; when it passes the negative electrode 202, it acquires a negative charge. These charged electrode plates 602, upon entering the electric field of the stator disk 3, are subjected to an electric field force. Specifically, the positively charged electrode plates 602 are attracted by the negative conductive plate 302 and repelled by the positive conductive plate 303 of the stator disk 3. The negatively charged electrode plate 602 is attracted by the positive conductive plate 303 and repelled by the negative conductive plate 302. This mutual attraction and repulsion together form a torque acting on the rotor disk 6, thereby driving the rotor disk 6 to rotate around the shaft 4. Since the rotor disk 6 is fixedly connected to the shaft 4, the shaft 4 rotates synchronously. The bearing 7 reduces friction during rotation, ensuring smooth rotation. Ultimately, it drives the stirring blade 5 fixed at one end of the shaft 4 to achieve stable low-speed rotation. In this process, the trailing part 603 of the outer edge of the electrode plate 602 plays a key role. When the rotor disk 6 has a tendency to rotate in the opposite direction, the trailing part 603 can first enter the corona region of the electrode of the charge exchange cylinder 2, so that the entire electrode plate 602 is charged in an asymmetrical position, thereby generating a corrective torque in the electric field of the stator disk 3, pulling the rotor back to the set direction, ensuring the directional rotation of the rotor disk 6, avoiding the defect of random direction start-up, and realizing reliable directional self-starting.

[0035] The quiet and efficient microwave oven stirrer direct drive motor described in this application solves the problems of self-starting dead point and uncontrollable rotation direction of electrostatic motors through the synergistic design of charge exchange, electric field effect and tail section 603 guidance. At the application level, it realizes stable rotation of low-speed light load without the need for a reducer, and has the characteristics of quietness, high efficiency and reliability. In addition, due to the simplified overall structure, easily worn parts such as reducers are avoided, the motor failure rate is greatly reduced, the service life is extended, and the maintenance cost is reduced, providing a more reliable drive solution for frequently used household appliances such as microwave ovens.

[0036] As a preferred example of this application, a negative electrode ring 204 and a positive electrode ring 205 are respectively provided at opposite ends of the cylindrical side plate 201. The negative electrode ring 204 is electrically connected to a plurality of negative electrode switching electrodes 202 on the cylindrical side plate 201, and the positive electrode ring 205 is electrically connected to a plurality of positive electrode switching electrodes 203 on the cylindrical side plate 201. The positive electrode ring 205 is connected to the positive terminal of the power supply, and the negative electrode ring 204 is connected to the negative terminal of the power supply. In the example of this application, by arranging a ring structure with a negative electrode ring 204 and a positive electrode ring 205 at opposite ends of the side plate 201 of the charge exchange cylinder 2, spatial conflicts with the alternately stacked rotor disk 6 and stator disk 3 are avoided, ensuring more compact use of space inside the motor and adapting to the limited installation environment of the microwave oven. At the same time, the negative electrode ring 204 is electrically connected to multiple negative electrode exchangers 202 distributed longitudinally on the side plate 201 of the cylinder. The charge input from the negative power supply can be evenly distributed to each negative electrode exchanger 202 through the negative electrode ring 204, avoiding the situation where the charge of individual exchangers is insufficient or excessive, so that each negative electrode exchanger 202 can provide a stable negative charge to the electrode plate 602 of the rotor disk 6. Similarly, the positive electrode ring 205 is connected to multiple positive electrode exchangers 202. The switching electrode 203 is electrically connected, and the charge input from the positive terminal of the power supply can be evenly transferred to all positive switching electrodes 203 via the positive ring 205, ensuring that the charge distribution of each positive switching electrode 203 is consistent. This avoids the uneven charging phenomenon caused by local charge differences in the rotor disk 6 electrode plate 602. The power supply port is introduced through the ring structure. It is only necessary to directly connect the positive ring 205 and the negative ring 204 to the positive and negative terminals of the external power supply, respectively. There is no need to wire each switching electrode separately. The original complex many-to-many connection is changed to a simple one-to-one connection. While reducing the assembly process, it also reduces the number of connection points, significantly reducing the risk of power interruption due to loose terminals or poor contact. This makes the overall power supply of the motor more stable and reliable, thereby achieving higher operational consistency and reliability.

[0037] As a preferred example of this application, the stator plate 301 of the stator disk 3 is provided with a negative electrode conductive sheet 302 and a positive electrode conductive sheet 303 on the upper and lower sides respectively. The negative electrode conductive sheet 302 and the positive electrode conductive sheet 303 are mirror-distributed on the upper and lower sides of the stator plate 301. The negative electrode conductive sheet 302 is tightly electrically connected to the negative electrode switching electrode 202, and the positive electrode conductive sheet 303 is tightly electrically connected to the positive electrode switching electrode 203. In the example of this application, by setting mirror-distributed negative electrode conductive plates 302 and positive electrode conductive plates 303 on the upper and lower sides of the stator disk 3, a completely symmetrical electric field can be constructed within the limited space of the stator plate 301. This avoids the uneven electric field caused by excessively strong or weak electric fields on one side, ensuring that the rotor disk 6 experiences consistent forces on both sides during rotation, thus achieving stable rotation and preventing deviation. Simultaneously, the negative electrode conductive plate 302 is tightly connected to the negative electrode switching electrode 202, and the positive electrode conductive plate 303 is also tightly connected to the positive electrode switching electrode 203. This significantly reduces contact resistance during charge transfer, resulting in almost no charge loss during transfer from the switching electrode to the conductive plate, ensuring that each conductive plate can stably acquire sufficient charge. This ensures that the electric field distribution remains uniform and symmetrical over a long period. On the other hand, this connection method eliminates the need for separate power supply wires for each negative electrode conductive plate 302 and positive electrode conductive plate 303, and also eliminates the need for intermediate conductive transfer structures. Charge transfer is completed directly through the electrode of the charge exchange cylinder 2, which significantly reduces the number of power supply-related wires and auxiliary structures, greatly simplifies the complexity of the circuit connection, and reduces the risk of faults such as loosening and oxidation of the circuit. At the same time, the mirror distribution structure can perfectly match the alternating stacked design of the stator disk 3 and the rotor disk 6, so that the rotor disk 6 can receive a balanced electric field from both the top and bottom during the movement, making the rotational force more concentrated and stable, avoiding eccentricity or uneven rotation caused by unilateral force, and ultimately improving the overall stability and quietness of the motor operation.

[0038] As a preferred example of this application, the positive electrode conductive plate 303 corresponds one-to-one with the positive electrode switching electrode 203, and the negative electrode conductive plate 302 corresponds one-to-one with the negative electrode switching electrode 202. In the example of this application, by setting the positive electrode conductive plate 303 on the stator disk 3 to correspond one-to-one with the positive electrode switching electrode 203 on the charge exchange cylinder 2, and simultaneously setting the negative electrode conductive plate 302 on the stator disk 3 to correspond one-to-one with the negative electrode switching electrode 202 on the charge exchange cylinder 2, the electrode distribution relationship between the stator disk 3 and the charge exchange cylinder 2 forms a highly consistent matching structure. Each positive electrode switching electrode 203 can stably transfer its charge and act on the corresponding positive electrode conductive plate 303 when the rotor disk 6 electrode plate 602 passes by, and each negative electrode switching electrode 202 can also stably transfer its charge and act on the corresponding negative electrode switching electrode 303 when the rotor disk 6 electrode plate 602 passes by. The negative electrode conductive sheet 302 avoids the problem of uneven charge conduction paths that may be caused by many-to-many or many-to-one arrangements. This makes the charge more concentrated and clear during the exchange and transfer process, and the formation direction and force distribution of the electric field are more stable. As a result, the transfer of charge from the charge exchange cylinder 2 to the stator disk 3 during motor operation no longer depends on random coverage or dispersion. Instead, it achieves rapid, efficient and stable charge replenishment through a clear correspondence. This ensures that the electrode action of the motor remains consistent and controllable at any angle position, avoiding torque fluctuation problems caused by uneven charge supply or asymmetrical electrode arrangement. This maintains the continuity and stability of the rotation of the stirring plate 5 during operation.

[0039] As a preferred example of this application, the outer edge of the stator plate 301 and the cylindrical side plate 201 of the charge exchange cylinder 2 are fastened together by a first slot 206 and a first buckle 304. In this example, several first buckles 304 are designed on the outer edge of the stator plate 301, and matching first slots 206 are provided at corresponding positions on the cylindrical side plate 201 of the charge exchange cylinder 2. The two are fixed by insertion and engagement. This connection method can quickly complete the installation of the stator disk 3 and the charge exchange cylinder 2, avoiding the use of screws, welding or bonding, simplifying the overall assembly steps of the motor, reducing errors and uncertainties caused by operation, and at the same time, the tight fit between the first buckle 304 and the first slot 206 can limit the stator disk 3 in the radial and axial directions. The upward displacement ensures that the stator disk 3 maintains a stable position even when subjected to vibration during motor operation, preventing swaying or shifting. This ensures that the negative conductive plate 302 and the negative electrode 202, and the positive conductive plate 303 and the positive electrode 203 arranged on the stator plate 301 are always precisely aligned and in close contact. This avoids insufficient charge transfer due to positional misalignment or poor contact during charge transfer, ensuring that the electric field is always uniform and stable. This makes the rotor disk experience force balance during rotation, further improving the stability and smoothness of rotation.

[0040] As a preferred example of this application, the frame assembly 1 includes an upper frame plate 101 and a lower frame plate 102, and the upper and lower ends of the charge exchange cylinder 2 are respectively inserted and fixed to the upper frame plate 101 and the lower frame plate 102. In the example of this application, a stable mounting base is formed by the upper and lower frame plates of the frame assembly 1, and the assembly is completed by inserting the upper and lower ends of the charge exchange cylinder 2 into the frame plates. No additional screws or glue are required; the installation is completed simply by aligning the upper and lower ends of the charge exchange cylinder with the corresponding insertion positions. This greatly simplifies the assembly process and improves assembly efficiency. At the same time, it avoids the fixing risks caused by screws rusting due to long-term moisture or glue failing due to aging. This ensures that the charge exchange cylinder 2 remains stable during long-term operation. The insertion structure can also precisely limit the radial and axial movement of the charge exchange cylinder 2, ensuring that it will not shift due to vibration or rotor drive during motor operation. This keeps the relative position between the charge exchange cylinder 2 and the conductive sheet of the stator disk 3 stable at all times, ensuring contact stability and continuity of charge transfer. This avoids problems such as poor charge transfer or uneven contact caused by shift. This insertion fixing method not only improves assembly convenience and reliability but also ensures the long-term stability of motor operation, providing a solid motor drive guarantee for uniform heating inside the microwave oven.

[0041] As a preferred example of this application, the electrode sheet 602 is provided in multiple forms and divided into group A electrodes and group B electrodes. The group A electrodes include multiple first electrode sheets 6021, and the group B electrodes include multiple second electrode sheets 6022. The first electrode sheets 6021 and the second electrode sheets 6022 are arranged in a uniform alternating pattern on the rotor plate 601. The first electrode sheets 6021 of group A electrodes and the second electrode sheets 6022 of group B electrodes are not physically directly connected and maintain the same polarity at any time. In the example of this application, the electrode plates 602 on the rotor disk 6 are designed as group A electrodes and group B electrodes, and are arranged in a uniform alternating manner on the rotor plate 601. Each adjacent first electrode plate 6021 is separated by a second electrode plate 6022, and each adjacent second electrode plate 6022 is separated by a first electrode plate 6021. Furthermore, the distribution spacing of all electrode plates 602 on the rotor plate 601 is completely consistent. This ensures that a stable number of electrode plates 602 are sequentially charged by the charge exchange cylinder 2 during the rotation of the rotor disk 6, preventing a sudden decrease in rotor force due to an uneven distribution of electrode plates leading to an insufficient number of chargeable electrode plates at any given moment. Simultaneously, all the first electrode plates of group A... The first electrode 6021 and all the second electrode plates 6022 of the B group electrodes are not directly connected, which can effectively prevent charge exchange or short circuit caused by accidental contact between electrode plates. This allows each electrode to independently and stably bear charge in the electric field. At any time during motor operation, all first electrode plates 6021 and all second electrode plates 6022 always maintain the same polarity. This layout not only ensures that the direction of the force on the same type of electrode plates in the electric field is always consistent, but also allows the electric field force to continuously and evenly act on the rotor disk 6 throughout the entire rotation cycle. This avoids problems such as uneven force, rotation jamming, or sudden speed changes that may occur during motor operation, thereby ensuring that the stirring blade can maintain a stable and quiet low-speed rotation for a long time.

[0042] As a preferred example of this application, the trailing portion 603 is formed by offsetting along the extending direction of the electrode plate 602 toward the circumferential direction of the rotor disk 6, and the offset direction of the plurality of trailing portions 603 is consistent. In the example of this application, a trailing portion 603 is provided at the end of the electrode plate 602 of the rotor disk 6. The end of the electrode plate 602 is on the side away from the first through hole 604 at the center of the rotor disk 6. The trailing portion 603 no longer extends in a straight line along the extending direction of the electrode plate 602, but is uniformly offset toward the circumferential direction of the rotor disk 6, and the end of the trailing portion 603 is flush with the outer edge of the rotor plate 601. Thus, when the motor is running, when the electrode plate 602 is subjected to the electric field force from the stator disk 3, the trailing portion 603 makes the electrode plate 602 subject to the charge. The rotor disk 6 preferentially enters the corona region of the charge exchange cylinder 2 and guides these forces to be more concentrated in the direction favorable to rotation, making the torque formation smoother and more stable. At the same time, since the tails 603 of all electrode plates 602 are biased in the same direction, the force direction is avoided from being dispersed or canceled out, so that the entire rotor disk 6 maintains a high degree of consistency and directionality in the force in the electric field, thereby achieving continuous and stable rotation of the rotor disk 6 and further ensuring the stability and uniformity of the rotation process of the stirring plate 5. Ultimately, this allows the motor to exhibit more stable, quiet and efficient performance when running at low speed.

[0043] As a preferred example of this application, the rotor disk 6 is provided with at least two layers, and the electrode plates 602 on the two rotor disks 6 are staggered in the circumferential direction. In the example of this application, by designing the rotor disk 6 as at least two layers and arranging them in a circumferentially staggered manner between adjacent layers, the distribution of the electrode plates 602 in the circumferential direction is made more uniform and dense. This significantly increases the probability of interaction between the electrode plates 602 and the electrodes of the charge exchange cylinder 2. That is, when one layer of electrode plates 602 does not enter the corona region, the other staggered layer of electrode plates 602 can just enter the corona region, thereby achieving a continuous interaction between the electrode plates 602 and the electric field. This densely staggered layout avoids the situation of excessively large spacing between electrode plates in a single-layer structure, ensuring that a portion of the electrode plates 602 are always within the corona region when the motor is powered on, thus achieving a stable and reliable self-starting effect. Furthermore, during the rotation of the rotor disk 6, as each layer of electrode plates 602 enters the corona region in sequence, a continuous and stable driving torque can be formed, making the motor run more smoothly and reducing the lag and uncertainty in the start-up process. This results in a faster start-up response and smoother operation of the entire stirring blade drive system, further improving the efficiency and quietness of the direct drive motor in microwave oven applications.

[0044] As a preferred example of this application, the quiet and efficient microwave oven stirrer direct drive motor is a brushless structure, which can directly drive the stirrer 5 without a reducer when running at low speed. The quiet and efficient microwave oven stirrer direct drive motor of this application adopts a brushless structure, which eliminates the brushes in traditional motors that are prone to generating friction noise. After the motor is powered on, it relies on the electric field force (attraction and repulsion of charges) between the conductive plates of the stator disk 3 and the electrode plates of the rotor disk 6 to drive the rotor to rotate. Since there are no brushes, there is no brush friction loss when the rotor rotates; and the motor itself can stably output the low speed required by the stirrer. The rotor can be directly connected to the stirrer 5 without the need for speed conversion through a reducer. The power is directly transmitted from the motor rotor to the stirrer 5.

[0045] In some examples of this application, if the scenario requires slightly higher torque (e.g., a slightly increased load on the agitator), a reducer with an extremely low reduction ratio can be used in conjunction with an electrostatic motor. Here, "extremely low reduction ratio" means a reduction ratio much lower than the high reduction ratio used when an electrostatic motor drives the agitator (e.g., a reduction ratio no greater than 3:1, adjusted according to the actual load). This extremely low reduction ratio reducer can moderately increase the output torque while slightly reducing the motor speed, thus better matching the load on the agitator.

[0046] It is important to emphasize that even with an extremely low reduction ratio reducer, the electrostatic motor remains at an "extremely low speed" (the motor speed only needs a slight adjustment to meet the requirements of the stirring blade load), unlike an electromagnetic motor which relies on a "high reduction ratio" to drastically reduce high-speed rotation to low-speed operation under load. This design retains the core advantages of the electrostatic motor—brushless operation, quiet operation, and low speed—while compensating for insufficient torque through a simplified reduction gear, and avoiding the problems of increased noise, complex structure, and high energy loss associated with high reduction ratios.

[0047] This application also discloses a method for the directional self-starting of a quiet and efficient microwave oven stirrer direct drive motor, including: The electrode plate 602 of the rotor disk 6 is configured with a tail portion 603; When the power is turned on, the trailing part 603 preferentially enters the corona region of the electrode of the charge exchange cylinder 2 and becomes charged; Under the electric field generated by the stator disk 3, if the rotor disk 6 has a tendency to rotate in the opposite direction, the electrode plate 602 generates negative work when it enters the stator electrode action area, causing the rotor disk 6 to be subjected to torque and return to the set direction. When the rotor disk 6 rotates in the set direction, the electrode plate 602 is at the center of action of the stator electrode when passing the electrode of the charge exchange cylinder 2, in the range of no negative work, so that the rotor disk 6 and the stirring plate 5 can start and rotate stably and continuously in the set direction.

[0048] This application provides a trailing portion 603 at the end of the electrode plate 602 on the rotor disk 6. When the motor is powered on, a corona region is formed around the electrode of the charge exchange cylinder 2. The trailing portion 603 enters the corona region around the electrode of the charge exchange cylinder 2 before the main body of the electrode plate 602 and becomes charged first. This allows the electrode plate 602 to preferentially generate torque when interacting with the electric field of the stator disk 3. When the rotor disk 6 rotates in the opposite direction to the set direction, the charged trailing portion 603 participates in the force in advance, causing the entire electrode plate 602 to generate a torque that suppresses the reverse motion. This effect manifests as a force against reverse motion. The negative work is done, thus forcing the rotor disk 6 back to the set rotation direction; when the rotor disk 6 rotates in the set direction, the electrode plate 602 is exactly located in the center force area of ​​the stator electrode at the moment it passes the charge exchange cylinder 2 electrode and becomes charged. Under this condition, the electric field force on the electrode plate 602 always promotes rotation without creating resistance. Therefore, the rotor disk 6 can maintain rotation in a single direction when it starts up and maintain stable torque transmission in subsequent continuous operation. This method achieves the simplification of the rotor starting direction and the smoothness of the rotation process by precisely guiding the order and direction of the force, ensuring that the stirring plate 5 rotates stably.

[0049] Furthermore, the rotor assembly adopts a two-layer rotor disk 6 structure design, and the two layers of rotor disk 6 are staggered at a certain angle along the circumference. Through this staggered design, the distribution density of electrode plates 602 on the two layers of rotor disk 6 in the circumference is doubled. That is, the circumferential gap between adjacent electrode plates 602 on the original single-layer rotor disk 6 is filled by the electrode plates 602 of the other layer of rotor disk 6. This ensures that no matter what circumferential angle the rotor assembly is at, there is always at least one layer of rotor disk 6 with electrode plates 602 within the corona influence range of the charge exchange cylinder 2 electrode. This completely eliminates the dead point problem of "the rotor electrode being outside the corona region and unable to start", laying a structural foundation for reliable starting of the motor at the moment of power-on.

[0050] This application discloses a quiet and efficient microwave oven stirrer direct-drive motor and directional self-starting method. By abandoning the traditional drive method of electromagnetic motors combined with reducers, it directly uses an electrostatic motor to drive light, low-speed rotating loads. This fully utilizes the characteristics of electrostatic motors—low power consumption, high efficiency, and quiet operation under low-speed, light-load conditions—allowing the system to achieve stable low-speed output without the need for additional speed-reducing devices. This avoids noise and energy loss caused by meshing friction of reducers. Furthermore, since the operating current of the electrostatic motor is positively correlated with its speed, the current is stably maintained at the microampere level under the target low-speed operating condition, and the overall power consumption can be controlled at the milliwatt level, ensuring extremely low energy consumption and extremely high energy efficiency. This solution also incorporates staggered electrode layers and an electric field with a trailing structure on the rotor disc. The electrode plates enable the motor to achieve self-starting and directional rotation during the startup phase through preferential charge capture and electric field correction, without relying on external force assistance. This effectively solves the problems of startup uncertainty and uncontrollable direction that are traditionally present in electrostatic motors. Even if a stall occurs during operation, the motor will not continuously consume current due to the limitation of the capacitor charging and discharging principle, thus avoiding the risk of burnout. This not only improves the safety and reliability of the motor system, but also reduces the reliance on overcurrent protection devices in the structural design, making the overall structure simpler and more compact. This direct drive solution achieves ultra-low power consumption and extreme quietness, while also significantly extending the service life of the motor and related loads. It provides a stable, safe, and reliable new solution and technical path for low-speed, light-load scenarios, especially for agitator drives in household appliances.

[0051] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A quiet and efficient microwave oven stirrer direct drive motor, characterized in that, include: Frame component (1), a functional component used to support the motor; The stator disk (3) is disposed within the frame assembly (1) and includes a stator plate (301) and alternating negative electrode conductive plates (302) and positive electrode conductive plates (303) thereon, which are used to form a uniform and stable electric field when connected to an external power source. The rotor disk (6), which is stacked alternately with the stator disk (3), includes a rotor plate (601) and a plurality of radially arranged electrode plates (602). Each electrode plate (602) has a tail (603) at the end of its outer edge. The tail (603) is used to preferentially enter the charge area during operation and maintain the charge to ensure that the rotor disk (6) rotates in a set direction. The charge exchange cylinder (2) is arranged on the outer circumference of the stator disk (3) and includes a cylinder side plate (201). Negative electrode exchanger (202) and positive electrode exchanger (203) are alternately arranged longitudinally on the cylinder side plate (201) to provide charge to the electrode plates (602) on the rotor disk (6) when the motor is running. A rotating shaft (4) passes through the stator disk (3) and is fixedly connected to the rotor disk (6), and is supported on the frame assembly (1) by a bearing (7) for transmitting the rotation of the rotor disk (6) to an external load; The stirring blade (5) is fixedly connected to one end of the rotating shaft (4) and is used to rotate stably at low speed inside the microwave oven cavity.

2. The quiet and efficient microwave oven stirring blade direct drive motor according to claim 1, characterized in that, A negative electrode ring (204) and a positive electrode ring (205) are respectively provided at opposite ends of the side plate (201) of the cylinder. The negative electrode ring (204) is electrically connected to a plurality of negative electrode switching electrodes (202) on the side plate (201) of the cylinder. The positive electrode ring (205) is electrically connected to a plurality of positive electrode switching electrodes (203) on the side plate (201) of the cylinder. The positive electrode ring (205) is connected to the positive terminal of the power supply, and the negative electrode ring (204) is connected to the negative terminal of the power supply.

3. The quiet and efficient microwave oven stirring blade direct drive motor according to claim 2, characterized in that, The stator plate (301) of the stator disk (3) is provided with a negative electrode conductive sheet (302) and a positive electrode conductive sheet (303) on the upper and lower sides respectively. The negative electrode conductive sheet (302) and the positive electrode conductive sheet (303) are mirror-distributed on the upper and lower sides of the stator plate (301). The negative electrode conductive sheet (302) is tightly electrically connected to the negative electrode switching electrode (202), and the positive electrode conductive sheet (303) is tightly electrically connected to the positive electrode switching electrode (203).

4. The quiet and efficient microwave oven stirring blade direct drive motor according to claim 3, characterized in that, The positive electrode conductive sheet (303) corresponds one-to-one with the positive electrode switching electrode (203), and the negative electrode conductive sheet (302) corresponds one-to-one with the negative electrode switching electrode (202).

5. The quiet and efficient microwave oven stirring blade direct drive motor according to claim 1, characterized in that, The outer edge of the static plate (301) is fastened to the side plate (201) of the charge exchange cylinder (2) by the first slot (206) and the first buckle (304).

6. The quiet and efficient microwave oven stirring blade direct drive motor according to any one of claims 1 to 5, characterized in that, The electrode sheet (602) is provided in multiple and divided into group A electrode and group B electrode. Group A electrode includes multiple first electrode sheets (6021), and group B electrode includes multiple second electrode sheets (6022). The first electrode sheets (6021) and the second electrode sheets (6022) are arranged in a uniform alternating manner on the rotor plate (601). The first electrode sheets (6021) of group A electrode and the second electrode sheets (6022) of group B electrode are not physically directly connected and maintain the same polarity at any time.

7. The quiet and efficient microwave oven stirring blade direct drive motor according to claim 6, characterized in that, The trailing portion (603) is biased in the circumferential direction of the rotor disk (6) along the extension direction of the electrode sheet (602), and the biasing direction of the plurality of trailing portions (603) is consistent.

8. The quiet and efficient microwave oven stirring blade direct drive motor according to claim 7, characterized in that, The rotor disk (6) is provided with at least two layers, and the electrode plates (602) on the two rotor disks (6) are staggered in the circumferential direction.

9. The quiet and efficient microwave oven stirring blade direct drive motor according to claim 1 or 8, characterized in that, The quiet and efficient microwave oven stirring blade direct drive motor is a brushless structure. When running at low speed, it can directly drive the stirring blade (5) without a reducer. Alternatively, it can be combined with an extremely low reduction ratio reducer with a reduction ratio of no more than 3:1 to drive the stirring blade (5).

10. A method for directional self-starting of a direct-drive motor for a microwave oven stirrer blade that is quiet and efficient, characterized in that, include: The electrode plate (602) of the rotor disk (6) is configured with a tail portion (603); When the power is turned on, the trailing part (603) preferentially enters the corona region of the charge exchange cylinder (2) electrode and becomes charged; Under the electric field generated by the stator disk (3), if the rotor disk (6) tends to rotate in the opposite direction, the electrode plate (602) generates negative work when it enters the stator electrode action area, causing the rotor disk (6) to be subjected to torque and return to the set direction. When the rotor disk (6) rotates in the set direction, the electrode plate (602) is at the center of action of the stator electrode when passing the electrode of the charge exchange cylinder (2), and there is no negative work range, so that the rotor disk (6) and the stirring plate (5) can start and rotate stably in the set direction.

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