TWI677169B - Partially shielding rotor assembly - Google Patents

Abstract

A partially shielded rotor assembly includes a rotor body, a first baffle and a second baffle. The rotor body is provided with a plurality of internal flow channels extending from a first end portion to a second end portion, and the first end portion and the second end portion are provided with a plurality of guide vanes. The first baffle is disposed at the first end portion and defines a first ventilation area and a first wind shielding area corresponding to the internal flow channel. The second baffle is disposed at the second end portion, and defines a second ventilation area and a second wind protection area respectively corresponding to the first wind protection area and the first ventilation area. Therefore, when the partially shielded rotor assembly rotates, the external air flows from the first ventilation zone and the second ventilation zone to the second windshield zone and the first windshield zone, respectively. One of thermal energy.

Description

Partially shielded rotor assembly

The invention relates to a rotor structure, in particular to a partially shielded rotor assembly.

A motor is a device that converts electrical energy into kinetic energy by electromagnetic induction. It is a universal and widely used motor in today's society. It usually includes a motor frame and a motor core component. The motor core component includes a stator structure and a rotor structure. In the process of converting electric energy into kinetic energy, current will be conducted in the stator windings, thereby generating a current magnetic effect. However, in the process of conduction, the current will be lost due to the resistance contained in the coil itself (for example, copper loss and iron loss), thereby generating excess thermal energy. This thermal energy can damage the components inside the motor, causing the motor to malfunction. Therefore, how to eliminate the excess heat generated by the motor is an extremely important issue.

Please combine the first to third figures, wherein the first figure is a perspective view showing a rotor structure of the prior art; the second figure is a cross-sectional view showing the AA of the first figure; and the third figure is a prior art rotor structure Temperature level distribution diagram of the operating state. As shown, a turn The sub-structure PA1 includes a rotor body PA11 and a baffle plate PA12.

The rotor structure PA1 extends from a first end portion PAP1 in an extension direction PAD to a second end portion PAP2, and is provided with a plurality of internal flow channels extending along the first end portion PAP1 in the extension direction PAD to the second end portion PAP2. PAIT, and the first end PAP1 of the rotor structure PA1 has a plurality of deflectors PA111.

The baffle plate PA12 is arranged at the first end PAP1 and is connected to the deflector piece PA111, and forms a deflector channel PAT with any two adjacent deflector pieces PA111, thereby forming a plurality of the above-mentioned diversion channels PAT. .

When the motor starts to operate and the rotor structure PA1 starts to rotate, a centrifugal air flow PACF is generated at the first end PAP1 due to the relationship of the deflector PA111, so that the first end PAP1 forms a low-pressure band. The airflow will flow from the high-pressure zone to the low-pressure zone. Therefore, the air in the internal flow path PAIT will move toward the first end PAP1 to form an airflow PAF, which indirectly causes the second end PAP2 to also form a low-pressure zone. At this time, the external environment belongs to the high-pressure zone, so the air of the external environment will move to the second end PAP2 to form the airflow PAF. The air flow PAF flows through the internal flow path PAIT, which can take away the thermal energy generated by the rotor structure PA1, thereby reducing the temperature of the rotor structure PA1 during operation and avoiding problems caused by excessive temperature.

As shown in the third figure, the temperature level distribution diagram of the rotor structure PA1 in the running state. It should be noted here that the temperature level is a concept of a temperature interval. Each temperature level includes an actual temperature interval, and the higher the temperature level, the higher the actual temperature interval included. For example: Temperature level 1 refers to 11 to 20 degrees Celsius. Degree 2 means 21 to 30 degrees Celsius ... and so on.

It can be clearly seen from the figure that the temperature level 10 of the rotor structure PA1, that is, the place where the temperature is highest, is distributed in the center area of the rotor body PA11, and the range occupies almost one third of the rotor body PA11. The temperature level decreases from the region of temperature level 10 to the direction of the first end PAP1 and the second end PAP2, that is, the temperature distribution of the rotor structure PA1 decreases from the highest temperature in the center to the left and right sides.

However, the airflow PAF is from the second end PAP2 to the first end PAP1, that is, a unidirectional flow cycle. During the flow, the airflow PAF will continuously absorb the thermal energy of the rotor structure PA1. Therefore, the airflow PAF goes to the first When the end PAP1 moves, the higher the temperature, it is easy to cause the problem that the temperature at the intake air flow (that is, the second end PAP2) is lower, and the temperature at the outlet air flow (that is, the first end PAP1) is higher. In addition, if the airflow PAF flows into the second end PAP2 and flows toward the first end PAP1 again, it is necessary to open a channel on the motor frame or stator structure, also known as an air groove, so that the airflow PAF flows from the first end. After the part PAP1 flows out, it can flow into the second end PAP2 again through the channel. And opening a channel on the motor frame or stator structure will increase the difficulty of the process and increase the manufacturing cost. In addition, the opening of the air groove will also occupy the position of the heat dissipation fins. The heat fins need to be removed from the motor frame before the air grooves can be opened. This will reduce the heat dissipation efficiency due to the reduction of the number of heat dissipation fins and the area of heat radiation. .

Considering that in the prior art, the air flow continuously absorbs the thermal energy of the rotor structure when it flows in the internal flow channel, which easily causes the temperature of the second end portion at the intake air flow to be lower and the temperature of the first end portion at the outlet air flow to be higher. Causes the problem of uneven temperature distribution, and if the airflow is circulated into the second end again, it is necessary to open a channel (air groove) on the motor frame or stator structure, which not only increases the difficulty of the manufacturing process, but also causes manufacturing Rising costs. One of the main objects of the present invention is to provide a partially shielded rotor assembly, which is used to solve the problems of uneven temperature distribution and the need to open channels on the motor frame or stator structure in the prior art to achieve airflow recirculation.

In order to solve the problems of the prior art, the present invention adopts a necessary technical means to provide a partially shielded rotor assembly, which includes a rotor body, a first baffle and a second baffle.

The rotor body is provided with a plurality of internal flow channels extending from a first end portion to a second end portion, and the first end portion and the second end portion are provided with a plurality of guide vanes, so that when the rotor body rotates, A first centrifugal airflow is formed at the first end portion, and a second centrifugal airflow is formed at the second end portion.

The first baffle is disposed at the first end portion, and divides a first ventilation area and a first wind shielding area corresponding to the internal flow channel, and a first wind shielding structure is provided in the first wind shielding area. Thereby, an external air is allowed to flow into the corresponding one of the internal flow channels through the first ventilation area, and the external air is blocked from flowing into the corresponding internal flow channel through the first windshield area.

The second baffle is provided at the second end and corresponds to The internal flow channel divides a second ventilation area corresponding to the first windshield area and a second ventilation area corresponding to the first windshield area, and a second windshield structure is provided in the second windshield area, thereby Allow another external air to flow into the corresponding internal flow path of the other part through the second ventilation area, and block the other external air from flowing into the corresponding internal flow path of the part through the second wind shield area.

Based on the above-mentioned necessary technical means, one of the subsidiary technical means derived from the present invention is to make the deflectors in the partially shielded rotor assembly disposed at the first windshield area and the second end portion of the first end portion. The second windshield.

On the basis of the above-mentioned necessary technical means, one of the subsidiary technical means derived from the present invention is to make a first baffle in a partially shielded rotor assembly, and set a first diversion blocking structure in the first ventilation area, and open a First vent.

Based on the above-mentioned necessary technical means, one of the subsidiary technical means derived from the present invention is to make a second baffle in the partially shielded rotor assembly. A second diversion blocking structure is provided in the second ventilation area, and one Second vent.

Based on the above-mentioned necessary technical means, one of the subsidiary technical means derived from the present invention is to make the first windshield region in the partially shielded rotor assembly divide a plurality of first windshield subregions, and the first windshield The structure system includes a plurality of first windshield substructures corresponding to the first windshield subregion.

Based on the above-mentioned necessary technical means, one of the subsidiary technical means derived from the present invention is to make the first part of the partially shielded rotor assembly The two windshield regions are divided into a plurality of second windshield regions corresponding to the first windshield regions, and the second windshield structure includes a plurality of second windshield substructures corresponding to the second windshield regions.

As mentioned above, the partially shielded rotor assembly provided by the present invention uses the first baffle plate and the second baffle plate to respectively correspond to the internal flow path to divide the first ventilation area, the second wind protection area, and the first ventilation area corresponding to each other. The wind-shielded area and the second ventilation area allow the external air to flow from the first ventilation area at the first end to the second wind-shielded area at the second end and to the second ventilation area at the second end, respectively. The first windshield area at the first end achieves the purpose of a bidirectional flow cycle, thereby reducing the temperature of the partially shielded rotor assembly during rotation and extending the service life of the partially shielded rotor assembly.

PA1‧‧‧rotor structure

PA11‧‧‧Rotor body

PA111‧‧‧Guide

PA12‧‧‧Bezel

PAF‧‧‧Airflow

PACF‧‧‧ Centrifugal Airflow

PAD‧‧‧Extending direction

PAIT‧‧‧Internal runner

PAP1‧‧‧First End

PAP2‧‧‧Second end

PAT‧‧‧Diversion channel

1,1a, 1b‧‧‧‧Partially shielded rotor assembly

11, 11a‧‧‧rotor body

111, 111a‧‧‧ Guide

12, 12a, 12b ‧‧‧ the first baffle

121‧‧‧ first windshield structure

121b1, 121b2 ‧‧‧ the first windshield substructure

122a, 122b‧‧‧First vent

123a, 123b1, 123b2‧‧‧ first diversion blocking structure

13, 13a, 13b‧‧‧Second bezel

131‧‧‧second windshield structure

131b1, 131b2‧‧‧Second sheltering substructure

132a, 132b‧‧‧Second vent

133a, 133b1, 132b2‧‧‧Second diversion blocking structure

A1, A2‧‧‧ Outside air

BA1‧‧‧First Windshield

BA11a, BA11b‧‧‧First shelter area

BA2‧‧‧Second sheltered area

BA21a, BA21b‧‧‧Second Shelter Zone

CF1‧‧‧first centrifugal airflow

CF2‧‧‧Second Centrifugal Airflow

D‧‧‧ extension direction

IT, IT1, IT2‧‧‧ Internal runner

P1‧‧‧first end

P2‧‧‧Second end

T‧‧‧Diversion channel

VA1‧‧‧The first ventilation area

VA11a, VA11b‧‧‧The first ventilation subarea

VA2‧‧‧Second ventilation zone

VA21a, VA21b‧‧‧Second ventilation subarea

The first diagram is a perspective view of the rotor structure of the prior art; the second diagram is a cross-sectional view taken along the line AA of the first diagram; the third diagram is a temperature level distribution diagram showing the operating state of the rotor structure of the prior art; the fourth diagram is a An exploded perspective view of a partially shielded rotor assembly provided by the first embodiment of the invention; the fifth diagram is a perspective view of a partially shielded rotor assembly provided by the first embodiment of the invention; the sixth diagram is the fifth diagram BB sectional view; the seventh figure is a temperature level distribution diagram showing the operating state of a partially shielded rotor assembly provided by the first embodiment of the present invention; The eighth figure is a perspective exploded view of a partially shielded rotor assembly provided by the second embodiment of the present invention; the ninth figure is a perspective view of a partially shielded rotor assembly provided by the second embodiment of the present invention; FIG. Is an exploded perspective view of a partially shielded rotor assembly provided by the third embodiment of the present invention; and FIG. 11 is a perspective view of a partially shielded rotor assembly provided by the third embodiment of the present invention.

Please refer to the fourth to fifth figures. The fourth figure is an exploded perspective view of a partially shielded rotor assembly provided by the first embodiment of the present invention; and the fifth diagram is a first embodiment of the present invention. A perspective view of the partially shielded rotor assembly provided. As shown in the figure, a partially shielded rotor assembly 1 includes a rotor body 11, a first baffle plate 12, and a second baffle plate 13.

The rotor body 11 extends from a first end portion P1 in an extension direction D to a second end portion P2, and a plurality of internal flows extending from the first end portion P1 in the extension direction D to the second end portion P2 are also provided. Track IT, and the first end portion P1 and the second end portion P2 have a plurality of deflector pieces 111.

The first baffle plate 12 is disposed at the first end portion P1 and is divided into a first ventilation area VA1 and a first windshield area BA1 corresponding to the internal flow path IT, and a first windshield area BA1 is provided with a first A windshield structure 121. The purpose of the first windshield structure 121 is to block an external air A1 (labeled in the sixth figure) from flowing into the first windshield area BA1 through the first windshield area BA1. The corresponding internal runner IT. Since the first ventilation area VA1 is not provided with the first wind shielding structure 121, the external air A1 will not be blocked. Therefore, the external air A1 can flow into the internal flow channel IT corresponding to the first ventilation area VA1.

As shown in the fifth figure, the first windshield area BA1 is the area where the right half is blocked by the first windshield structure 121, and the first windshield area VA1 is the left half which is not covered by the first windshield structure 121. Occlusion area. In the first embodiment, there are twelve internal flow channels IT, and the first windshield area BA1 and the first ventilation area VA1 respectively correspond to six internal flow channels IT, which can achieve better heat dissipation effects.

The second baffle plate 13 is disposed at the second end portion P2, and also divides a second ventilation area VA2 and a second windshield area BA2 corresponding to the internal flow path IT, and a second windshield area BA2 is provided with a first Two windshield structures 131, wherein the second ventilation zone VA2 corresponds to the first windshield area BA1, and the second windshield area BA2 corresponds to the first windshield area VA1. The second windshield structure 131 is used to block another external air A2 (labeled in the sixth figure) from flowing into the corresponding internal flow channel IT through the second windshield area BA2.

The first baffle plate 12 and the second baffle plate 13 are in contact with any two adjacent deflector pieces 111 to form a diversion channel T, thereby forming a plurality of diversion channels T (only one of which is marked in the drawing).

It should be noted here that the outside air is actually the air in the environment where the partially shielded rotor assembly 1 is located, and the use of outside air A1 and another outside air A2 is for clarity only. The outside air A1 refers to the first end. The air in the environment where the portion P1 is located, and the other external air A2 refers to the air in the environment where the second end portion P2 is located.

Next, please refer to the fourth to seventh figures together, wherein the sixth figure is a cross-sectional view taken along the line BB of the fifth figure; and the seventh figure is a partially shielded rotor assembly provided by the first embodiment of the present invention Temperature level distribution diagram of the operating state.

As shown in the sixth figure, since a more detailed explanation is needed, the internal flow path IT is represented by the internal flow paths IT1 and IT2. The internal flow channel IT1 corresponds to the first ventilation area BA1 and the second ventilation area VA2, and the internal flow channel IT2 corresponds to the first ventilation area VA1 and the second ventilation area BA2. When the motor starts to run and the partially-shielded rotor assembly 1 rotates accordingly, the deflectors 111 of the first end portion P1 and the second end portion P2 each generate a first centrifugal airflow CF1 and a second centrifugal airflow CF2. It should be noted here that the purpose of the deflector 111 is mainly to guide or generate airflow, similar to the function of general fan blades, and the deflector 111 is generally made of aluminum, so it is also known in the industry "Aluminum leaf", "Rotor aluminum leaf" or "Rotor fan blade". But it is not limited to this, as long as the airflow can be guided or generated, the deflector 111 can also be made of materials such as iron, alloy, white iron, and plastic.

When the first centrifugal airflow CF1 and the second centrifugal airflow CF2 flow out through the diversion channel T, the first windshield area BA1 and the second windshield area BA2 each form a low-pressure zone, and the surrounding external air will go to the low-pressure zone. Flow, however, the first windshield structure 121 will block outside air from flowing in from the first windshield area BA1. Therefore, the external air A2 around the second ventilation area VA2 communicating with the first windshield area BA1 will flow into the internal flow The road IT1 continues to flow to the first windshield area BA1, and at the same time absorbs the thermal energy generated by the rotor body 11, and then turns into the first centrifugal airflow CF1 and flows out.

At the same time, the first The external air A1 around a ventilation area VA1 flows into the internal flow channel IT2 and continues to flow to the second windshield area BA2. At the same time, it absorbs the thermal energy generated by the rotor body 11 and turns into a second centrifugal airflow CF2 to flow out.

Because the first windshield area BA1 and the second ventilation zone VA2 correspond to the same internal flow passage, and the number is six, it means that there are six internal flow passages IT1 in total; the first ventilation zone VA1 and the second windshield area BA2 are Corresponding to the same internal flow channel, and the number is six, indicating that there are six internal flow channels IT2 in total. Therefore, in this embodiment, the internal flow channel IT can be divided into two types, one is the internal flow channel IT1 and the other is the internal flow channel IT2. In the internal flow channel IT1, the external air A1 flows from the second end portion P2 to the first end portion P1, and in the internal flow channel IT2, the external air A2 flows from the first end portion P1 to the second end portion P2. It can achieve the effect of two-way circulation, and it is not necessary to open a channel (air trench) on the motor frame or the stator structure, which simplifies the complexity of the manufacturing process and reduces the manufacturing cost.

The seventh diagram is the simulation analysis result of the first embodiment of the present invention. Comparing the third diagram together, it can be clearly seen that in the simulation data of this embodiment, the temperature level distribution diagram of the partially shielded rotor assembly 1 is shown. Areas with higher temperature levels are significantly reduced (such as temperature level 10), and the temperature level distribution region of the overall temperature distribution of the rotor body 11 generally decreases, indicating that the partially shielded rotor assembly 1 provided in this embodiment can effectively reduce the temperature Effect.

Please refer to the eighth and ninth diagrams, wherein the eighth diagram is an exploded perspective view of a partially shielded rotor assembly provided by the second embodiment of the present invention; and the ninth diagram is a second embodiment of the present invention A perspective view of the partially shielded rotor assembly provided. As shown, a The partially shielded rotor assembly 1a includes a rotor body 11a, a first baffle plate 12a, and a second baffle plate 13a.

The rotor body 11a is substantially the same as the rotor body 11 in the first embodiment, and the difference is only in the plurality of deflectors 111a. In the first embodiment, in order to avoid the centrifugal airflow generated by the deflectors 111, the first ventilation area VA1 and The outside air A1 and A2 flowing in the second ventilation area VA2 are taken away by the centrifugal airflow, so the deflector 111 is only disposed in the first windshield area BA1 and the second windshield area BA2.

In this embodiment, in order to avoid uneven weights at both ends of the rotor body 11a, the deflector 111a is looped at the first end portion P1 and the second end portion P2, that is, the first ventilation area VA1 and the second ventilation The area VA2 also has a deflector 111a. Although it may be possible to tow away some of the external air A1 and A2 that would flow into the first ventilation area VA1 and the second ventilation area VA2, it is possible to ensure that the weights at both ends of the rotor body 11a are nearly the same, and the operation is not caused by the weight As a result, the partially shielded rotor assembly 1a is damaged.

The first baffle plate 12a and the second baffle plate 13a will also be divided into corresponding first windshield areas BA1 and second ventilation areas VA2 and corresponding first ventilation zones VA1 and second corresponding to the internal flow path IT. Windshield area BA2. The difference from the first embodiment is exemplified by the second baffle plate 13a. The second baffle plate 13a is provided with a second windshield structure 131 in the second windshield area BA2, and a second windshield structure 131 is opened in the second ventilation zone VA2. The two ventilation openings 132a and a second diversion blocking structure 133a are used to allow external air A2 (labeled in the sixth figure) to flow into the internal flow passage IT corresponding to the second ventilation area VA2, and the first The purpose of the second diversion blocking structure 133a is to prevent the external air A2 flowing in through the second vent 132a from being subjected to the second The deflector 111a of the end portion P2 is guided and cannot flow into the internal flow path IT.

Similarly, the first windshield structure 121, the first ventilation opening 122a, and the first diversion blocking structure 123a in the first baffle 12a are respectively connected to the second windshield structure 131, the second ventilation opening 132a, and the second diversion flow. The blocking structure 133a is the same.

Finally, please refer to the tenth and eleventh diagrams, wherein the tenth diagram is a three-dimensional exploded view showing a partially shielded rotor assembly provided by the third embodiment of the present invention; and the eleventh diagram is a view showing the present invention A perspective view of a partially shielded rotor assembly provided in the third embodiment. As shown in the figure, a partially shielded rotor assembly 1b includes a rotor body 11a, a first baffle plate 12b, and a second baffle plate 13b. The rotor body 11a is the same as the second embodiment, so it will not be described in detail.

The difference from the first two embodiments is that the first ventilation area is divided into a plurality of first ventilation sub-areas, here are two first ventilation sub-areas VA11b and VA11a, and the first windshield area is correspondingly divided into the first The windshield subregions BA11b and BA11a are similarly divided into two second ventilation subregions VA21a and VA21b and two second windshield subregions BA21a and BA21b. Taking the first baffle plate 12b as an example, the first windshield structure of the first baffle plate 12b includes a plurality of first windshield substructures, here are two first windshield substructures 121b1 and 121b2, and the first windshield substructure 121b1 and 121b2 is arranged symmetrically. A first vent 122b is also opened, and the first vent 122b is also opened symmetrically. The first wind shield substructures 121b1 and 121b2 correspond to a part of the internal flow path IT, preferably half of the internal flow path IT; the first vent 122b corresponds to the remaining part of the internal flow path IT. this In addition, a plurality of first diversion blocking structures 123b1 and 123b2 are also provided around the first ventilation opening 122b, and their uses are the same as those of the first diversion blocking structure 123a in the second embodiment, so no further description is needed.

Similarly, the second windshield substructures 131b1, 131b2, the second ventilation openings 132b, the second diversion barrier structures 133b1, and 132b2 in the second baffle 13b are respectively the same as the first windshield structure 121b1 in the first baffle 12b. , 121b2, the first ventilation port 122b, and the first diversion blocking structure 123b1 and 123b2 are the same, so no further explanation is needed. In the third embodiment, the weights at both ends of the rotor body 11a will be more average than in the second embodiment, and the problem may be reduced due to uneven weights.

In summary, compared to the prior art rotor structure, the airflow can only flow into the air in one direction, and the airflow continuously absorbs the thermal energy generated by the rotor body. Therefore, when the airflow flows to the air outlet, the temperature will be higher than that of the air inlet. The higher the temperature, the higher the temperature near the air outlet, the worse the heat dissipation effect. In the partially-shielded rotor assembly provided by the present invention, the first baffle and the second baffle respectively correspond to the first ventilation area, the first wind protection area, the second ventilation area, and the second ventilation area divided by the internal flow channel. The wind-shielding zone, wherein the first ventilation zone corresponds to the second wind-shielding zone, and the first wind-shielding zone corresponds to the second ventilation zone. Therefore, the external air flows from the first ventilation area to the second windshield area, and the other external air flows from the second ventilation area to the first windshield area. In the case of wind tunnel, the purpose of bidirectional flow circulation can be achieved, and a better heat dissipation effect can be achieved, and various problems caused by the aforementioned wind tunnel opening are avoided.

With the detailed description of the above preferred embodiments, it is hoped that The features and spirit of the present invention can be more clearly described, and the scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalent arrangements within the scope of the patents to be applied for in the present invention.

Claims (6)

A partially shielded rotor assembly includes a rotor body provided with a plurality of internal flow channels extending from a first end portion to a second end portion, and the first end portion and the second end portion are connected to each other. There are a plurality of deflectors, so that when the rotor body rotates, a first centrifugal airflow is generated at the first end portion, and a second centrifugal airflow is generated at the second end portion; a first baffle plate is provided At the first end, a first ventilation area and a first windshield area are divided corresponding to the internal flow channels, and a first windshield structure is provided in the first windshield area, thereby allowing a External air flows into the corresponding internal flow passages of the corresponding part through the first ventilation area, and blocks external air from flowing into the internal flow passages of the corresponding other part through the first windshield area; and a second stop The plate is disposed at the second end portion, and divides a second ventilation area corresponding to the first ventilation area and a second ventilation area corresponding to the first ventilation area corresponding to the internal flow channels. Area, and a second windshield structure is provided in the second windshield area, whereby Allow another external air to flow into the internal flow channels corresponding to the other part through the second ventilation area, and block the other external air flow into the corresponding internal flows from the corresponding part through the second windshield area. Road. The partially-shielded rotor assembly according to item 1 of the scope of the patent application, wherein the deflectors are disposed in the first windshield area of the first end portion and the second shield windshield in the second end portion. Windy area. The partially-shielded rotor assembly according to item 1 of the scope of the patent application, wherein the first baffle is provided with a first flow blocking structure in the first ventilation area, and a first ventilation opening is provided. The partially shielded rotor assembly according to item 3 of the scope of the patent application, wherein the second baffle is provided with a second flow blocking structure in the second ventilation area, and a second ventilation opening is provided. The partially shielded rotor assembly according to item 1 of the scope of patent application, wherein the first windshield area is divided into a plurality of first windshield sub-areas, and the first windshield structure includes a plurality of corresponding ones. A first windshield structure of the first windshield region. The partially shielded rotor assembly according to item 5 of the scope of patent application, wherein the second windshield area is divided into a plurality of second windshield subareas corresponding to the first windshield subareas, and the second windshield subarea The wind structure includes a plurality of second windshield substructures corresponding to the second windshield subregions.