CN206809194U - Food cooking machine - Google Patents

Abstract

The utility model discloses a kind of food cooking machine, food cooking machine, including support, and the support includes casing and the motor, inner casing and the fan that are placed in the casing；The casing offers air outlet；The motor includes rotor and is sheathed on the stator of the rotor exterior, and the output shaft of the rotor upper end is connected with driving member, formed with gap between the inwall of the stator and the outer wall of the rotor；Formed with cavity in the inner casing, one end of the inner casing is tightly connected the stator, the other end of the inner casing abuts the casing and covered and sets on the outside of the air outlet, gap between the stator and the rotor connects to form air-out passage with the cavity of the inner casing, and the air-out passage connects the air outlet；The fan is placed in the cavity of the inner casing and closes on the air outlet and sets.Air quantity utilization rate is high in food cooking machine radiation processes of the present utility model, good heat dissipation effect, and caused noise is smaller.

Description

Food cooking machine

Technical field

An electro-technical field is the utility model is related to, more particularly to a kind of food cooking machine.

Background technology

Food cooking machine includes a variety of machines that stirring blade crushing and extruding food are driven by motor.With broken wall cooking machine Exemplified by, the rotating speed of its motor breaks up vegetables and fruits up to more than 25000 revs/min, thus by the stirring cutter energy moment of motor driven Cell membrane, therefore plant biochemistry element can be effectively extracted, it is modern household health care, health first choice household appliances.

For food cooking machine in its motor drives stirring blade high-speed rotation, food cooking chance produces more heat transfer, And the heat dissipation wind channel design in existing food cooking machine is poor so that air quantity utilization rate is low in cooking machine radiation processes, causes The radiating effect of critical component such as motor etc. is bad.

Utility model content

Main purpose of the present utility model is to provide a kind of food cooking machine, it is intended to improves in food cooking machine heat dissipation wind channel Air quantity utilization rate, lift the radiating effect of food cooking machine.

To achieve the above object, the utility model proposes food cooking machine, including support, the support include casing with And it is placed in motor, inner casing and fan in the casing；The casing offers air outlet；The motor include rotor with And be sheathed on the stator of the rotor exterior, the output shaft of the rotor upper end is connected with driving member, the inwall of the stator and Formed with gap between the outer wall of the rotor；In the inner casing institute is sealedly attached to formed with cavity, one end of the inner casing State stator, the other end of the inner casing, which abuts the casing and covered, to be set on the outside of the air outlet, the stator and the rotor it Between gap connect to form air-out passage with the cavity of the inner casing, the air-out passage connects the air outlet；The fan It is placed in the cavity of the inner casing and closes on the air outlet and sets.

Preferably, the casing is further opened with air inlet, and the outer wall of the inner casing and the stator is interior with the casing Gap between wall forms inlet air passage, and the inlet air passage connects the air-out passage and the air inlet.

Preferably, the fan is aerofoil fan, the fan and the output axis connection of the rotor lower end.

Preferably, the inner casing closes on one end of the air outlet and the casing has cooperatively formed silencing cavity, described to disappear Sound chamber connects the air-out passage and the air outlet, the fan are located in the silencing cavity.

Preferably, the central axis of the air-out passage, motor, fan, air outlet and silencing cavity overlaps.

Preferably, the inner casing includes the ventilating duct and spiral case being connected, and one end of the ventilating duct is socketed on the snail One end of shell, the affixed stator of the other end of the ventilating duct, the other end of the spiral case abut the casing.

Preferably, the spiral case includes the connecting cylinder and silencer cover being connected, and the wind-guiding is stretched into the connecting cylinder part In cylinder, the lower end of the silencer cover covers at the outside of the air outlet, and the intracavity diameter of the silencer cover is more than the connection The intracavity diameter of cylinder.

Preferably, where the flabellum of the fan is located at the connecting cylinder in altitude range.

Preferably, the inwall of the silencer cover is provided with acoustic damping materials layer.

Preferably, the casing includes shell and is covered on the bottom of the shell lower end, the spiral case and the bottom Lid surrounds the silencing cavity, and the central area of the bottom offers multiple air outlets, and the edge of the bottom has The air inlet, multiple air outlets set and are intervally arranged in a ring, and the annular center of circle is located at the fan On rotation axis.

Preferably, the surface of the bottom towards the spiral case is convexly equipped with annular protrusion, and the annular protrusion surrounds sound Sound reflection groove, the annular protrusion are located at the inner side of multiple air outlets set in a ring and positioned at the lower sections of the fan.

Preferably, the surface of the bottom towards the spiral case is also convexly equipped with snap ring, the snap ring positioned at it is multiple it is described go out Between the air inlet and the air outlet, the lower end of the silencer cover is sheathed on the snap ring in the outside and part in air port Outside.

Preferably, the food cooking machine also includes the stirring cup assembly for being installed on the support upper end, the jar group Part includes jar, and the bottom of the jar is provided with heater, and the heater includes being located at the jar bottom The heat conducting disk in portion and the electrothermal tube or Electric radiant Heating Film for being arranged on the heat conduction tray bottom；Or the heater includes being arranged on The magnetic conductive disk and coil panel of the jar bottom, the coil panel are located at below the magnetic conductive disk and relative with the magnetic conductive disk Set.

Preferably, the stirring cup assembly also includes mixing blade assembly of the part in the jar, the stirring Knife assembly includes being fixed on the tool rest of the heat conducting disk or magnetic conductive disk, being installed on the stirring blade of the tool rest, the stirring blade Cutter shaft and the rotor upper end output axis connection.

Preferably, the food cooking machine includes broken wall cooking machine, juice extractor, soy bean milk making machine and mixer.

Technical solutions of the utility model by food cooking machine by the stator of inner casing and motor connect, inner housing inner Cavity is connected with the gap in motor between stator and rotor and forms air-out passage, while fan is placed in the cavity of inner casing And set close to air outlet, then in the food cooking machine course of work, under the driving of fan, radiating air flows through air-out passage And when being discharged by air outlet, large quantity of air, will be big caused by motor by the inner surface of motor stator and the outer surface of rotor Calorimetric amount rapidly discharges support, because this food cooking machine is using the gap between electric motor internal stator and rotor as air-out passage A part, then reduce the area in air channel so that air quantity utilization rate gets a promotion, and the radiating efficiency of food cooking machine also obtains Lifting, simultaneously because the air quantity utilization rate in this food cooking machine radiation processes is higher, drives the power of the fan of air flow Can accordingly it reduce, the diameter of fan can also reduce, and can so reduce the cost of food cooking machine, can also reduce fan and run Caused wind is made an uproar in journey.

Brief description of the drawings

, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only It is some embodiments of the utility model, for those of ordinary skill in the art, is not paying the premise of creative work Under, other accompanying drawings can also be obtained according to the structure shown in these accompanying drawings.

Fig. 1 is the structural representation of the embodiment of the utility model food cooking machine one；

Fig. 2 is the cross section structure diagram of food cooking machine in Fig. 1；

Fig. 3 is the structural representation of the bottom of food cooking machine in Fig. 1；

Fig. 4 is the cross section structure diagram of the support of food cooking machine in Fig. 1；

Fig. 5 is the enlarged diagram at A in Fig. 4.

Drawing reference numeral explanation：

Realization, functional characteristics and the advantage of the utility model purpose will be described further referring to the drawings in conjunction with the embodiments.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out Clearly and completely describing, it is clear that described embodiment is only part of the embodiment of the present utility model, rather than all Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise Lower obtained every other embodiment, belong to the scope of the utility model protection.

It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute in the utility model embodiment It is only used for explaining relative position relation under a certain particular pose (as shown in drawings) between each part, motion conditions etc., such as When the fruit particular pose changes, then directionality instruction also correspondingly changes therewith.

In the utility model, unless otherwise clearly defined and limited, term " connection ", " fixation " etc. should do broad sense reason Solution, for example, " fixation " can be fixedly connected or be detachably connected, or integrally；Can mechanically connect, also may be used Be electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, can be the connection of two element internals Or the interaction relationship of two elements, limited unless otherwise clear and definite.For the ordinary skill in the art, can be with Concrete meaning of the above-mentioned term in the utility model is understood as the case may be.

In addition, and it can not be managed in the utility model such as relating to the description of " first ", " second " etc. is only used for describing purpose Solve to indicate or implying its relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define " the One ", at least one this feature can be expressed or be implicitly included to the feature of " second ".In addition, the skill between each embodiment Art scheme can be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, when technical scheme With reference to occurring conflicting or will be understood that the combination of this technical scheme is not present when can not realize, also not in the utility model It is required that protection domain within.

The utility model proposes a kind of food cooking machine 100.

Incorporated by reference to referring to figs. 1 to Fig. 3, the food cooking machine 100 of the present embodiment is by the support 10 located at lower section, and sets Stirring cup assembly 30 above support 10 is formed, wherein stirring cup assembly 30 includes jar 31, is arranged under jar 31 The heater at end and the mixing blade assembly (not indicating) of the heater and part in the jar 31 is installed on, The output shaft of the upper end of motor 15 wherein in support 10 is provided with driving member 155, the preferably clutch of driving member 155, stirring blade The cutter shaft of stirring blade 37 in 37 components drives stirring blade 37 by clutch and the output axis connection of the upper end of motor 15, motor 15 Speed rotation, so as to break the cell membrane of fruits and vegetables food materials, obtain the food materials of the flow-like of exquisiteness.

The support 10 includes casing 11 and the motor 15, inner casing 13 and the fan 17 that are placed in casing 11, described Casing 11 offers air outlet 14, and motor 15 includes rotor 151 and the stator 153 being sheathed on outside rotor 151, rotor 151 The output shaft of upper end is connected with driving member 155, formed with gap, inner casing 13 between the inwall of stator 153 and the outer wall of rotor 151 Interior (not indicated) formed with cavity, one end of inner casing 13 is tightly connected stator 153, and the other end of inner casing 13 abuts casing 11 and covered Located at the outside of air outlet 14, the gap between stator 153 and rotor 151 connects with the cavity of inner casing 13 and forms connection air outlet 14 air-out passage 18,17, fan are placed in inner casing 13 and set close to air outlet 14.

The present embodiment motor 15 and inner casing 13 are in arrangement up and down, the upper end of inner casing 13 and the lower end of stator 153 in support 10 Can by being socketed, welding, the mode such as gluing be fixedly connected, the cavity in motor 15 is connected to be formed and connected out with the cavity of inner casing 13 The air-out passage 18 in air port 14, in the running of food cooking machine 100, into the air in casing 11 by the upper of motor 15 End, i.e., the upper end in the gap formed between stator 153 and rotor 151 enter, from top to bottom to air outlet 14 run and by motor Caused amount of heat discharge in 15 runnings.Technical solutions of the utility model pass through interior by inner casing in food cooking machine 100 13 are connected with the stator 153 of motor 15, and the cavity of inner casing 13 connects with the gap in motor 15 between stator 153 and rotor 151 And air-out passage 18 is formed, while fan 17 is placed in inner casing 13 and set close to air outlet 14, then in the work of food cooking machine 100 During work, under the driving of fan 17, when radiating air is discharged by air-out passage 18 by air outlet 14, large quantity of air passes through The inner surface of the stator 153 of motor 15 and the outer surface of rotor 151, support is rapidly discharged by amount of heat caused by motor 15 10, due to one of this food cooking machine 100 using the gap between the inner stator 153 of motor 15 and rotor 151 as heat dissipation wind channel To divide, reduce the area in air channel so that air quantity utilization rate gets a promotion, and the radiating efficiency of food cooking machine 100 also gets a promotion, Simultaneously because the air quantity utilization rate in the radiation processes of this food cooking machine 100 is higher, the power of the fan 17 of air flow is driven Also can accordingly reduce, the diameter of fan 17 can also reduce, and can so reduce the cost of food cooking machine 100, on the other hand also may be used Made an uproar with reducing caused wind in the running of fan 17.

The present embodiment offers air inlet 12 in casing 11, and inner casing 13 and both outer walls of stator 153 are interior with casing 11 Gap between wall forms inlet air passage 16, and inlet air passage 16 connects air-out passage 18 and air inlet 12.

It should be understood that also include main control unit, the control being electrically connected with motor 15 in the support 10 of this food cooking machine 100 The automatically controlled plate such as panel processed, these automatically controlled plates may be provided in inlet air passage 16 or air-out passage 18, and the present embodiment is by electricity Control plate is preferably provided in inlet air passage 16, to realize the reasonable utilization in space in support 10.Because food cooking machine 100 is transported During row, automatically controlled plate will also produce heat, and extraneous air has air inlet 12 to enter and rise in inlet air passage 16, in The top of motor 15 enters air-out passage 18, is finally discharged by air outlet 14, and process, air flow side are circulated in air Xiang Weizhi it is upper and directly under mode, it is reasonable that the path in air channel is set, and caused windage is smaller, and radiating effect is more preferable, while air Generation noise in flow process is also smaller.

Further, fan 17 is aerofoil fan 17 used by the present embodiment, and the rotor of fan 17 and motor 15 The output axis connection of 151 lower ends.In the running of food cooking machine 100, fan 17 is driven by motor 15, then without separately setting Drive device, the cost of food cooking machine 100 can be reduced.From above-mentioned content, air-out passage 18 is to prolong straight down Stretch, and the distinguished and admirable of the driving of aerofoil fan 17 prolongs to the axial direction for being also fan 17, the rotary shaft of the rotor 151 of the present embodiment fan 17 Direction is stretched for straight down, the bearing of trend of such air-out passage 18 coincide with the wind driving direction of fan 17, then windage obtains Further reduce, wind flow is more smooth, and windage reduces, and wind is made an uproar and is also reduced.

The inner casing 13 includes the ventilating duct 131 and spiral case 133 being connected, one end of ventilating duct 131 and the one of spiral case 133 End socket, the affixed stator 153 of the other end of ventilating duct 131, the other end of spiral case 133 abut casing 11.

Ventilating duct 131 and spiral case 133 can use plastic material, and produce completion by integrated injection molding mode.It can manage Solution, spiral case 133 and ventilating duct 131 can also be integrative-structures in other embodiment.

Specifically, spiral case 133 includes the connecting cylinder 133a and silencer cover 133b being connected, and connecting cylinder 133a, which is stretched into part, to be led In air duct 131, silencer cover 133b lower end covers at the outside of air outlet 14, and silencer cover 133b intracavity diameter is more than connecting cylinder 133a intracavity diameter.

The present embodiment spiral case 133 is that socket mode connects with ventilating duct 131, and installation process is more convenient.Silencer cover simultaneously 133b intracavity diameter is more than connecting cylinder 133a intracavity diameter so that the wind in air-out passage 18 enters in flow process Wind speed is reduced behind silencer cover 133b inner chamber, then wind is made an uproar and further reduced.

Fig. 5 is refer to, the Plane of rotation of the flabellum of the present embodiment fan 17 is located in the altitude range of connecting cylinder 133a places. From above-mentioned content, connecting cylinder 133a is stretched into ventilating duct 131 so that connecting cylinder 133a intracavity diameter is less than ventilating duct 131 intracavity diameter, then in the rotary course of fan 17, it can be formed to the air suction effect in ventilating duct 131, then inlet air Air in passage 16 and ventilating duct 131 can be discharged into spiral case 133 rapidly, so as to accelerate the air flow in support 10, improve Radiating effect.

Further, the central axis of the air-out passage 18, motor 15, fan 17, air outlet 14 and silencing cavity 182 Overlap.The Duct design of such food cooking machine 100 is succinct, the distinguished and admirable outbound path under being formed directly, the noise reduction of food cooking machine 100 And radiating effect is more preferable.

Made an uproar to further reduce in support 10 caused noise and wind in motor 15 and the running of fan 17, this Embodiment is also pasted with acoustic damping materials layer (not shown) in silencer cover 133b inwall.Acoustic damping materials layer is preferably loose structure Acoustical cotton.

Incorporated by reference to reference picture 2 and Fig. 3, the present embodiment casing 11 includes shell 111 and is covered on the lower end of shell 111 Bottom 113, spiral case 133 and bottom 113 surround the silencing cavity 182, and the central area of the bottom 113 offers multiple institutes Air inlet 12 is stated, the edge of bottom 113 has air outlet 14, and multiple air outlets 14 are intervally arranged in a ring, and multiple described The annular center of circle that air outlet 14 is surrounded is located on the rotation axis of fan 17.

Because the present embodiment from aerofoil fan 17 is driven air flow, in the running of fan 17, fan 17 The wind-force of underface is smaller, and the wind-force of the lower section at the flabellum edge of fan 17 is larger, then multiple uniform intervals of air inlet 12 are in Annular shape arrangement, the air driven by fan 17 can be discharged just by the air outlet 14 of lower section, and the circulation path of wind is smooth, be produced Wind make an uproar also further reduce.

Further, incorporated by reference to reference picture 4 and Fig. 5, surface projection of the bottom 113 described in the present embodiment towards spiral case 133 There is annular protrusion 115, annular protrusion 115 is surrounded by sound reflection groove 117, and annular protrusion 115 is located at the inner side of air outlet 14 simultaneously Positioned at the underface of fan 17.

In the running of food cooking machine 100, motor 15 and fan 17 run caused noise in rotary course and led to Cross air-out passage 18 to air outlet 14 propagate when, a noise part is slackened by being disturbed in the convolution of sound reflection groove 117, separately A part of noise is by sound reflection groove 117 to the internal reflection of air-out passage 18 and with being passed in air-out passage 18 to the direction of air outlet 14 The noise broadcast forms interference, so as to further weaken noise caused by food cooking machine 100.

The surface of the present embodiment bottom 113 towards the spiral case 133 is also convexly equipped with snap ring 119, snap ring 119 positioned at it is multiple go out Air port 14 forms the outside of annular and part is between air inlet 12 and air outlet 14, and silencer cover 133b lower end is sheathed on The outside of snap ring 119.The present embodiment spiral case 133 is connected with bottom 113 by being socketed mode, in the assembling process of support 10 compared with It is convenient.

Please further in conjunction with referring to Figures 1 and 2, the present embodiment food cooking machine 100 also includes being installed on the upper end of support 10 Cup assembly 30 is stirred, stirring cup assembly 30 includes jar 31, and the bottom of jar 31 is provided with heater (not indicating), added Thermal includes the heat conducting disk 33 for being located at the bottom of jar 31 and the electrothermal tube 35 or Electric radiant Heating Film that are arranged on the bottom of heat conducting disk 33； Or magnetic conductive disk (not shown) and coil panel (not shown) of the heater including being arranged on the bottom of jar 31, coil panel is located at It is oppositely arranged below magnetic conductive disk and with magnetic conductive disk.

The food cooking machine 100 of the present embodiment can use resistance-type heating or Electromagnetic Heating mode, in Electromagnetic Heating mode In, magnetic conductive disk can be such as cast iron permeability magnetic material.In resistance-type mode of heating, the overall structure of food cooking machine 100 is simpler Single, cost is relatively low, and in Electromagnetic Heating mode, heating effect is preferable.

The stirring cup assembly 30 also includes mixing blade assembly of the part in jar 31, and mixing blade assembly includes solid Due to the tool rest 39 of heat conducting disk 33 or magnetic conductive disk, it is installed on the stirring blade 37 of tool rest 39, the cutter shaft and rotor 151 of stirring blade 37 The output axis connection of upper end.

The present embodiment motor 15 drives that stirring blade 37 rotates and fan 17 rotates simultaneously, need not so set different dynamic Power apparatus, it can further save the cost and installing space of food cooking machine 100.

This food cooking machine 100 includes broken wall cooking machine, juice extractor, soy bean milk making machine and mixer.Wherein, broken wall cooking machine can Gather the product functions such as juice extractor, soy bean milk making machine, Ice-cream machine, cooking machine, grinder, food cells wall can be broken up moment, discharge Plant biochemistry element.

Preferred embodiment of the present utility model is the foregoing is only, not thereby limits the scope of the claims of the present utility model, Every equivalent structure change under inventive concept of the present utility model, made using the utility model specification and accompanying drawing content Change, or directly/be used in other related technical areas indirectly and be included in scope of patent protection of the present utility model.

Claims (14)

1. a kind of food cooking machine, it is characterised in that including support, the support includes casing and is placed in the casing Motor, inner casing and fan；

The casing offers air outlet；

The motor includes rotor and is sheathed on the stator of the rotor exterior, and the output shaft of the rotor upper end is connected with biography Moving part, formed with gap between the stator and rotor；

The stator is sealedly attached to formed with cavity, one end of the inner casing in the inner casing, the other end of the inner casing supports Connect the casing and cover and set on the outside of the air outlet, the gap between the stator and the rotor and the cavity of the inner casing connect Logical to form air-out passage, the air-out passage connects the air outlet；

The fan is placed in the cavity of the inner casing and closes on the air outlet and sets.

2. food cooking machine as claimed in claim 1, it is characterised in that the casing is further opened with air inlet, the inner casing and Gap between the inwall of the outer wall of the stator and the casing forms inlet air passage, and the inlet air passage connects the air-out Passage and the air inlet.

3. food cooking machine as claimed in claim 1, it is characterised in that the fan is aerofoil fan, the fan and institute State the output axis connection of rotor lower end.

4. food cooking machine as claimed in claim 2, it is characterised in that the inner casing closes on one end and the institute of the air outlet State casing and cooperatively formed silencing cavity, the silencing cavity connects the air-out passage and the air outlet, the fan are located at institute State in silencing cavity.

5. food cooking machine as claimed in claim 4, it is characterised in that the air-out passage, motor, fan, air outlet with And the central axis of silencing cavity overlaps.

6. food cooking machine as claimed in claim 4, it is characterised in that the inner casing includes ventilating duct and the snail being connected Shell, one end of the ventilating duct are socketed on one end of the spiral case, the affixed stator of the other end of the ventilating duct, the snail The other end of shell abuts the casing.

7. food cooking machine as claimed in claim 6, it is characterised in that the spiral case includes connecting cylinder and the noise reduction being connected Cover, the connecting cylinder part are stretched into the ventilating duct, and the lower end of the silencer cover covers at the outside of the air outlet, described The intracavity diameter of silencer cover is more than the intracavity diameter of the connecting cylinder.

8. food cooking machine as claimed in claim 7, it is characterised in that the flabellum of the fan is located at where the connecting cylinder In altitude range.

9. food cooking machine as claimed in claim 7, it is characterised in that the inwall of the silencer cover is provided with acoustic damping materials layer.

10. the food cooking machine as described in any one in claim 7 to 9, it is characterised in that the casing include shell with And the bottom of the shell lower end is covered on, the spiral case and the bottom surround the silencing cavity, the center of the bottom Domain offers multiple air outlets, and the edge of the bottom has the air inlet, and multiple air outlets are set in a ring Put and be intervally arranged, and the annular center of circle is located on the rotation axis of the fan.

11. food cooking machine as claimed in claim 10, it is characterised in that surface projection of the bottom towards the spiral case There is annular protrusion, the annular protrusion is surrounded by sound reflection groove, and the annular protrusion is located at multiple air-out set in a ring The inner side of mouth and the lower section for being located at the fan.

12. food cooking machine as claimed in claim 10, it is characterised in that the bottom is also convex towards the surface of the spiral case Provided with snap ring, the snap ring be located at the outside of multiple air outlets and part positioned at the air inlet and the air outlet it Between, the lower end of the silencer cover is sheathed on the outside of the snap ring.

13. food cooking machine as claimed in claim 1, it is characterised in that the food cooking machine also includes being installed on the machine The stirring cup assembly of seat upper end, the stirring cup assembly include jar, and the bottom of the jar is provided with heater, institute Stating heater includes the heat conducting disk for being located at the jar bottom and the electrothermal tube or electricity that are arranged on the heat conduction tray bottom Hotting mask；Or magnetic conductive disk and coil panel of the heater including being arranged on the jar bottom, the coil panel are located at It is oppositely arranged below the magnetic conductive disk and with the magnetic conductive disk.

14. food cooking machine as claimed in claim 13, it is characterised in that the stirring cup assembly also includes part and is located at institute The mixing blade assembly in jar is stated, the mixing blade assembly includes being fixed on the tool rest of the heat conducting disk or magnetic conductive disk, peace The output axis connection of stirring blade loaded on the tool rest, the cutter shaft of the stirring blade and the rotor upper end.