CN213931263U

CN213931263U - Photovoltaic cooling and heating air conditioner all-in-one machine

Info

Publication number: CN213931263U
Application number: CN202022962976.0U
Authority: CN
Inventors: 王泽�
Original assignee: Datong Yungang Zeneng Technology Co ltd
Current assignee: Datong Yungang Zeneng Technology Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-08-10
Anticipated expiration: 2030-12-10

Abstract

The utility model discloses a photovoltaic cooling and heating integrated machine, which comprises an integrated machine body and photovoltaic equipment, the integrated machine body is placed indoors, the photovoltaic equipment is placed outdoors, the integrated machine body and the photovoltaic equipment are connected by wires, and the photovoltaic equipment comprises a photovoltaic panel, a photovoltaic device, and a photovoltaic device. Photovoltaic panel support mechanism and photovoltaic panel protection mechanism, the photovoltaic panel is arranged on the photovoltaic panel support mechanism, and the photovoltaic panel protection mechanism is located on the north side of the photovoltaic panel support mechanism; the photovoltaic panel support mechanism includes a support base, a support cavity, a support leg and a height adjustment Component, the support leg is set on the support base, the support base is provided with positioning and installation holes, the support cavity is set on the support leg, the support cavity is set in a hollow structure, the height adjustment component is set in the support cavity, and the photovoltaic panel is set at the height on the adjustment assembly. The utility model relates to an air conditioner, in particular to a photovoltaic cooling and heating air conditioner integrated machine with an angle adjustment function and a photovoltaic panel protection function in rainy and snowy weather.

Description

Photovoltaic cooling and heating air conditioner all-in-one machine

Technical Field

The utility model relates to an air conditioning equipment specifically is a photovoltaic changes in temperature air conditioner all-in-one.

Background

An air conditioner is a very important household appliance for improving indoor temperature and providing a comfortable living environment. At present, the traditional air conditioner on the market mostly depends on electric power to heat in winter and cool in summer, and the mode needs to consume a large amount of energy.

In recent years, with the continuous improvement of the demand of people, scientific and technical personnel begin to research and develop air conditioners which are more comfortable, more convenient to use, more energy-saving and more environment-friendly.

The photovoltaic cooling and heating air conditioner all-in-one machine comprises photovoltaic equipment and is used for converting solar energy into electric energy. In order to improve the conversion efficiency, the photovoltaic equipment is usually arranged outdoors, and although the existing photovoltaic equipment is subjected to waterproof and sun-proof treatment, the photovoltaic panel or the photovoltaic panel support structure can still be damaged due to long-term wind, rain and rain; in addition, the sunlight irradiation angles in different time periods are different, and in order to increase the receiving area of the photovoltaic panel for solar energy, a photovoltaic panel capable of adjusting the inclination direction needs to be provided.

SUMMERY OF THE UTILITY MODEL

To the above situation, for overcoming current technical defect, the utility model provides a photovoltaic changes in temperature air conditioner all-in-one with angle modulation function to and have photovoltaic panel safeguard function's photovoltaic equipment in sleet weather.

The utility model adopts the following technical scheme: the utility model relates to a photovoltaic changes in temperature air conditioner all-in-one, including all-in-one body and photovoltaic equipment, the all-in-one body is arranged in the room, photovoltaic equipment is arranged outdoors, the all-in-one body passes through the connection of electric lines with photovoltaic equipment, photovoltaic equipment includes photovoltaic board, photovoltaic board supporting mechanism and photovoltaic board protection mechanism, the photovoltaic board is located on the photovoltaic board supporting mechanism, photovoltaic board protection mechanism locates the photovoltaic board supporting mechanism north side; the photovoltaic panel supporting mechanism comprises a supporting base, a supporting cavity, supporting legs and a height adjusting assembly, wherein the supporting legs are arranged on the supporting base, positioning mounting holes are formed in the supporting base, the supporting cavity is arranged on the supporting legs, the supporting cavity is arranged in a hollow structure, the height adjusting assembly is arranged in the supporting cavity, and the photovoltaic panel is arranged on the height adjusting assembly; the photovoltaic panel protection mechanism comprises a storage shell, a protection shell, a driving motor, a driving shaft, a driving conical wheel, a driven shaft I, a driven conical wheel I, a driven driving gear I, a driving shaft II, a driving conical wheel II, a driven shaft II, a driven driving gear II and a supporting plate, wherein the storage shell is of a cavity structure with an opening at one side, the supporting plate is arranged on the top wall of the storage shell, the supporting plate is uniformly distributed with three groups along the top wall of the storage shell, the driven shaft I, the driving shaft I and the driven shaft II are respectively rotatably arranged on the three groups of supporting plates, the driving motor is arranged on the top wall of the storage shell, the driving shaft is connected with an output shaft of the driving motor, the driving conical wheel is arranged on the driving shaft, the driven conical wheel I is arranged on the driven shaft I, the first driven conical wheel is meshed with the first driving conical wheel, the first driven driving gear is arranged on the first driven shaft, the first driving conical wheel is arranged at one end of the first transmission shaft, the first transmission conical wheel is positioned at the other side of the first driving conical wheel and is meshed with the first driving conical wheel, the second transmission conical wheel is arranged at the other end of the first transmission shaft, the second transmission shaft is rotatably arranged on the top wall of the storage shell, the third transmission conical wheel is arranged on the second transmission shaft, the third transmission conical wheel is meshed with the second transmission conical wheel, the second driven conical wheel is arranged on the second driven shaft, the second driven driving gear is meshed with the third transmission conical wheel, the second driven driving gear is arranged on the second driven shaft, the protective shell comprises a group of transverse plates and two groups of vertical plates, the two groups of vertical plates are vertically arranged on two sides below the transverse plates, two groups of sawteeth are symmetrically arranged on two sides of the upper ends of the transverse plates, and the first driven driving gears and the second driven driving gears are respectively meshed with the first driven driving gears, the side wall of the storage shell is provided with a clamping groove, the vertical plate is provided with a clamping bulge, and the vertical plate is slidably arranged in the clamping groove through the clamping bulge.

Further, it is equipped with auxiliary drive axle to rotate on the relative both sides wall in storage shell lower part, the auxiliary drive axle both ends are equipped with two sets of supplementary limit gear respectively, and are two sets of the riser lower extreme all is equipped with the sawtooth, and is two sets of the sawtooth and two sets of supplementary limit gear meshing of riser.

Further, the height adjusting assembly comprises driving sleeves, inner screw rods, driving belts and a power output assembly, the driving sleeves are provided with four groups, the four groups of driving sleeves are respectively rotatably arranged on the bottom wall of the supporting cavity body and are respectively a first driving sleeve, a second driving sleeve, a third driving sleeve and a fourth driving sleeve, the first driving sleeve and the second driving sleeve are positioned on one side far away from the photovoltaic panel protection mechanism, the third driving sleeve and the fourth driving sleeve are positioned on one side close to the photovoltaic panel protection mechanism, the first driving sleeve and the third driving sleeve are correspondingly arranged, the second driving sleeve and the fourth driving sleeve are correspondingly arranged, the inner screw rods are connected in the driving sleeves through threads, the inner screw rods and the driving sleeves are correspondingly provided with four groups, and four corners of the photovoltaic panel are hinged on the upper ends of the four groups of inner screw rods, the power output assembly is arranged on the bottom wall of the supporting cavity and comprises a height adjusting motor, a height adjusting driving shaft and a driving disc, the power output assembly is provided with three groups, the three groups of power output assemblies are respectively a first power output assembly, a second power output assembly and a third power output assembly, the first power output assembly is arranged between a first driving sleeve and a third driving sleeve, the second power output assembly is arranged between a third driving sleeve and a fourth driving sleeve, the third power output assembly is arranged between the second driving sleeve and the fourth driving sleeve, the driving belt is provided with three groups, the three groups of driving belts are respectively a first driving belt, a second driving belt and a third driving belt, two ends of the first driving belt are respectively sleeved on the first driving sleeve, the third driving sleeve and the driving disc of the first power output assembly, the two ends of the second driving belt are respectively sleeved on the third driving sleeve, the fourth driving sleeve and the driving disc of the second power output assembly, and the two ends of the third driving belt are respectively sleeved on the second driving sleeve, the fourth driving sleeve and the driving disc of the third power output assembly.

Further, the driving motor and the height adjusting motor are both positive and negative double-rotation motors.

Adopt above-mentioned structure the utility model discloses the beneficial effect who gains as follows: the utility model relates to a photovoltaic cooling and heating air conditioner all-in-one machine, which provides energy for the cooling and heating air conditioner all-in-one machine through the arrangement of photovoltaic equipment, and reduces the consumption of traditional energy; the photovoltaic panel supporting mechanism is arranged, so that the adjustment of the inclination direction and the inclination angle of the photovoltaic panel is met, the photovoltaic panel can be better matched with the sunlight irradiation angles in different time periods, and the solar energy conversion rate is improved; simultaneously, through photovoltaic board protection machanism with photovoltaic board cooperation setting, satisfied under the bad weather, to the protection of photovoltaic board, improved the life of photovoltaic board.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view of the overall structure of a photovoltaic cooling and heating air conditioning integrated machine of the present invention;

fig. 2 is the utility model relates to a photovoltaic changes in temperature air conditioner all-in-one photovoltaic board protection machanism's main structure sketch map of looking.

The photovoltaic device comprises an integrated machine body 1, an integrated machine body 2, photovoltaic equipment 3, a photovoltaic panel 4, a photovoltaic panel supporting mechanism 5, a photovoltaic panel protection mechanism 6, a supporting base 7, a supporting cavity 8, supporting legs 9, a height adjusting assembly 10, a containing shell 11, a protection shell 12, a driving motor 13, a driving shaft 14, a driven shaft I, 15, a driven cone wheel I, 16, a driven driving gear I, 17, a driving shaft I, 18, a driving shaft II, 19, a driving cone wheel I, 20, a driving cone wheel II, 21, a driving cone wheel III, 22, a driven cone wheel II, 23, a driven shaft II, 24, a driven driving gear II, 25, a supporting plate 26, an auxiliary driving shaft 27, an auxiliary limiting gear 28, a driving sleeve 29, an inner screw rod 30, a driving belt 31 and a power output assembly.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments; based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

As shown in fig. 1-2, the technical scheme adopted by the utility model is as follows: a photovoltaic cooling and heating air conditioner all-in-one machine comprises an all-in-one machine body 1 and photovoltaic equipment 2, wherein the all-in-one machine body 1 is arranged indoors, the photovoltaic equipment 2 is arranged outdoors, the all-in-one machine body 1 is connected with the photovoltaic equipment 2 through an electric wire, the photovoltaic equipment 2 comprises a photovoltaic panel 3, a photovoltaic panel supporting mechanism 4 and a photovoltaic panel protection mechanism 5, the photovoltaic panel 3 is arranged on the photovoltaic panel supporting mechanism 4, and the photovoltaic panel protection mechanism 5 is arranged on the north side of the photovoltaic panel supporting mechanism 4; the photovoltaic panel supporting mechanism 4 comprises a supporting base 6, a supporting cavity 7, supporting legs 8 and a height adjusting assembly 9, wherein the supporting legs 8 are arranged on the supporting base 6, positioning mounting holes are formed in the supporting base 6, the supporting cavity 7 is arranged on the supporting legs 8, the supporting cavity 7 is arranged in a hollow structure, the height adjusting assembly 9 is arranged in the supporting cavity 7, and the photovoltaic panel 3 is arranged on the height adjusting assembly 9; the photovoltaic panel protection mechanism 5 comprises a storage shell 10, a protection shell 11, a driving motor 12, a driving shaft 13, a driving conical wheel 32, a driven shaft I14, a driven conical wheel I15, a driven driving gear I16, a driving shaft I17, a driving shaft II 18, a driving conical wheel I19, a driving conical wheel II 20, a driving conical wheel III 21, a driven conical wheel II 22, a driven shaft II 23, a driven driving gear II 24 and a supporting plate 25, wherein the storage shell 10 is of a cavity structure with an opening at one side, the supporting plate 25 is arranged on the top wall of the storage shell 10, the supporting plate 25 is uniformly distributed with three groups along the top wall of the storage shell 10, the driven shaft I14, the driving shaft I17 and the driven shaft II 23 are respectively and rotatably arranged on the three groups of supporting plates 25, the driving motor 12 is arranged on the top wall of the storage shell 10, the driving shaft 13 is connected with an output shaft of the driving motor 12, and the driving conical wheel 32 is arranged on the driving shaft 13, a driven conical wheel I15 is arranged on a driven shaft I14, the driven conical wheel I15 is meshed with a driving conical wheel 32, a driven driving gear I16 is arranged on the driven shaft I14, a driving conical wheel I19 is arranged at one end of a driving shaft I17, the driving conical wheel I19 is positioned at the other side of the driving conical wheel 32 and is meshed with the driving conical wheel 32, a driving conical wheel II 20 is arranged at the other end of the driving shaft I17, a driving shaft II 18 is rotatably arranged on the top wall of the containing shell 10, a driving conical wheel III 21 is arranged on the driving shaft II 18, the driving conical wheel III 21 is meshed with the driving conical wheel II 20, a driven conical wheel II 22 is arranged on the driven shaft II 23, the driven conical wheel II 22 is meshed with the driving conical wheel III 21, a driven driving gear II 24 is arranged on the driven shaft II 23, the protective shell 11 comprises a group of transverse plates and two groups of vertical plates which are vertically arranged on two sides below the transverse plates, and two groups of saw teeth are symmetrically arranged on two sides of the upper end of the transverse plates, the sawteeth on the transverse plate are respectively meshed with the first driven driving gear 16 and the second driven driving gear 24, the side wall of the storage shell 10 is provided with a clamping groove, the vertical plate is provided with a clamping bulge, and the vertical plate is arranged in the clamping groove in a sliding mode through the clamping of the clamping bulge.

Wherein, accomodate and rotate on the relative both sides wall in casing 10 lower part and be equipped with auxiliary drive axle 26, auxiliary drive axle 26 both ends are equipped with two sets of supplementary stop gear 27 respectively, and two sets of riser lower extremes all are equipped with the sawtooth, and the sawtooth of two sets of risers meshes with two sets of supplementary stop gear 27.

The height adjusting assembly 9 comprises driving sleeves 28, inner screws 29, driving belts 30 and a power output assembly 31, the driving sleeves 28 are provided with four groups, the four groups of driving sleeves 28 are respectively rotatably arranged on the bottom wall of the supporting cavity 7, the four groups of driving sleeves 28 are respectively a first driving sleeve, a second driving sleeve, a third driving sleeve and a fourth driving sleeve, the first driving sleeve and the second driving sleeve are positioned at one side far away from the photovoltaic panel protection mechanism 5, the third driving sleeve and the fourth driving sleeve are positioned at one side close to the photovoltaic panel protection mechanism 5, the first driving sleeve and the third driving sleeve are correspondingly arranged, the second driving sleeve and the fourth driving sleeve are correspondingly arranged, the inner screws 29 are connected in the driving sleeves 28 through threads, the inner screws 29 are correspondingly provided with four groups corresponding to the driving sleeves 28, four corners of the photovoltaic panel 3 are hinged at the upper ends of the four groups of inner screws 29, the power output assembly 31 is arranged on the bottom wall of the supporting cavity 7, the power output assembly 31 comprises a height adjusting motor, a height adjusting driving shaft and a driving disc, the power output assembly 31 is provided with three groups, the three groups of power output assemblies 31 are respectively a first power output assembly, a second power output assembly and a third power output assembly, the first power output assembly is arranged between a first driving sleeve and a third driving sleeve, the second power output assembly is arranged between a third driving sleeve and a fourth driving sleeve, the third power output assembly is arranged between a second driving sleeve and a fourth driving sleeve, the driving belt 30 is provided with three groups, the three groups are respectively a first driving belt, a second driving belt and a third driving belt, two ends of the first driving belt are respectively sleeved on the first driving sleeve, the third driving sleeve and the driving disc of the first power output assembly, two ends of the second driving belt are respectively sleeved on the third driving sleeve, the fourth driving sleeve and the driving disc of the second power output assembly, the two ends of the third driving belt are respectively sleeved on the second driving sleeve, the fourth driving sleeve and the driving disc of the third power output assembly.

The driving motor 12 and the height adjusting motor are both positive and negative double-rotation motors.

When the photovoltaic panel is used, the photovoltaic panel 3 absorbs solar energy and efficiently converts the solar energy into electric energy through corresponding components to provide electric energy for the work of the all-in-one machine body 1, in the work process of the photovoltaic panel 3, the photovoltaic panel 3 can be respectively driven to face the south (the third driving sleeve and the fourth driving sleeve are driven to rotate by the second power output component, the third driving sleeve and the fourth driving sleeve drive the corresponding inner screw 29 to ascend), the photovoltaic panel 3 faces the west (the first power output component drives the first driving sleeve and the third driving sleeve to rotate, the first driving sleeve and the third driving sleeve drive the corresponding inner screw 29 to ascend), and the photovoltaic panel 3 faces the east (the second driving sleeve and the fourth driving sleeve are driven to rotate by the third power output component, the second driving sleeve and the fourth driving sleeve drive the corresponding inner screw 29 to ascend), thereby improving the adaptation of the inclination direction of the photovoltaic panel 3 to the sunlight irradiation direction, and improving the energy conversion efficiency; in addition, in rainy and snowy weather, the driving motor 12 is started, the driving motor 12 finally drives the first driven driving gear 16 and the second driven driving gear 24 to rotate through a series of gear transmission, the first driven driving gear 16 and the second driven driving gear 24 rotate to push the protective shell 11 out of the storage shell 10, the protective shell 11 covers the photovoltaic panel 3 and the photovoltaic panel supporting mechanism 4, the protection of the photovoltaic panel 3 is achieved, and when the weather is clear, the protective shell 11 can be returned to the storage shell 10 through the driving motor 12.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An all-in-one photovoltaic cooling and heating air conditioner, characterized in that it comprises an all-in-one machine body and a photovoltaic device, the all-in-one machine body is placed indoors, the photovoltaic device is placed outdoors, and the all-in-one machine body and the photovoltaic device are connected by wires , the photovoltaic equipment includes a photovoltaic panel, a photovoltaic panel support mechanism and a photovoltaic panel protection mechanism, the photovoltaic panel is provided on the photovoltaic panel support mechanism, and the photovoltaic panel protection mechanism is located on the north side of the photovoltaic panel support mechanism; the photovoltaic panel The support mechanism includes a support base, a support cavity, a support leg and a height adjustment assembly. The support leg is set on the support base, and the support base is provided with a positioning and installation hole. The support cavity is set on the support leg. The support cavity is arranged in a hollow structure, the height adjustment component is arranged in the support cavity, and the photovoltaic panel is arranged on the height adjustment component; the photovoltaic panel protection mechanism includes a storage housing, a protection housing, a driving motor, an active Shaft, driving cone wheel, driven shaft 1, driven cone wheel 1, driven drive gear 1, transmission shaft 1, transmission shaft 2, transmission cone wheel 1, transmission cone wheel 2, transmission cone wheel 3 , the second driven conical wheel, the second driven shaft, the second driven driving gear and the support plate, the storage casing is a cavity structure with one side open, and the support plate is arranged on the top wall of the storage casing, There are three groups of the support plates evenly distributed along the top wall of the storage case, the first driven shaft, the first transmission shaft and the second driven shaft are respectively arranged on the three groups of support plates for rotation, and the drive motor is arranged in the storage case On the top wall, the drive shaft is connected to the output shaft of the drive motor, the drive cone wheel is arranged on the drive shaft, the driven cone wheel is set on the driven shaft The first wheel meshes with the driving conical wheel, the first driven driving gear is arranged on the driven shaft 1, the transmission conical wheel 1 is arranged at one end of the transmission shaft 1, and the transmission conical wheel 1 is located on the driving conical wheel 1. The other side of the wheel is meshed with the driving conical wheel. The second transmission conical wheel is arranged on the other end of the first transmission shaft. Set on the second transmission shaft, the third transmission cone wheel meshes with the second transmission cone wheel, the second driven cone wheel is set on the second driven shaft, and the second driven cone wheel meshes with the transmission cone The wheels are meshed three times, the second driven driving gear is arranged on the second driven shaft, the protective casing includes a set of horizontal plates and two sets of vertical plates, and the two sets of vertical plates are vertically arranged on both sides of the lower side of the horizontal plate. Two sets of saw teeth are symmetrically arranged on both sides of the upper end of the horizontal plate. The saw teeth on the horizontal plate mesh with the driven driving gear 1 and the driven driving gear 2 respectively, and the side wall of the receiving housing is provided with an engaging groove. The vertical plate is provided with a snap-fit protrusion, and the vertical board is snap-fitted and slidably arranged in the snap-fit groove through the snap-fit protrusion.

2 . The photovoltaic cooling, heating and air conditioning integrated machine according to claim 1 , wherein an auxiliary drive shaft is rotated on the opposite side walls of the lower part of the storage casing, and two ends of the auxiliary drive shaft are respectively provided with two 2. 2 . A set of auxiliary limit gears, the lower ends of the two sets of vertical plates are provided with serrations, and the serrations of the two sets of vertical plates mesh with the two sets of auxiliary limit gears.

3 . The photovoltaic cooling, heating and air conditioning integrated machine according to claim 2 , wherein the height adjustment assembly comprises a drive sleeve, an inner screw, a drive belt and a power output assembly, and the drive sleeve is provided with four sets of 3 . , the four sets of the drive sleeves are respectively rotatably arranged on the bottom wall of the support cavity, and the four sets of the drive sleeves are respectively the first drive sleeve, the second drive sleeve, the third drive sleeve and the fourth drive sleeve the first drive sleeve and the second drive sleeve are located on the side away from the photovoltaic panel protection mechanism, the third drive sleeve and the fourth drive sleeve are located on the side close to the photovoltaic panel protection mechanism, the The first drive sleeve and the third drive sleeve are arranged correspondingly, the second drive sleeve and the fourth drive sleeve are arranged correspondingly, the inner screw rod is set in the drive sleeve through a threaded connection, and the inner screw rod is connected to the drive sleeve. There are four sets of corresponding sleeves, the four corners of the photovoltaic panel are hinged on the upper ends of the four sets of inner screws, and the power output assembly is set on the bottom wall of the support cavity. The power output assembly includes a height adjustment motor, a height adjustment active A shaft and a drive disc, the power output assembly is provided with three groups, and the three groups of the power output assembly are respectively a first power output assembly, a second power output assembly and a third power output assembly, and the first power output assembly is located in the between the first drive sleeve and the third drive sleeve, the second power output assembly is arranged between the third drive sleeve and the fourth drive sleeve, and the third power output assembly is arranged on the second drive sleeve Between the cylinder and the fourth moving sleeve, the driving belt is provided with three groups, the three groups are the first driving belt, the second driving belt and the third driving belt respectively, and the two ends of the first driving belt are respectively sleeved on the third driving belt. A drive sleeve, a third drive sleeve and a drive plate of the first power output assembly, and both ends of the second drive belt are respectively sleeved on the third drive sleeve, the fourth drive sleeve and the second power output assembly On the drive plate of the third drive belt, both ends of the third drive belt are respectively sleeved on the second drive sleeve, the fourth drive sleeve and the drive plate of the third power output assembly.

4 . The photovoltaic cooling, heating and air conditioning integrated machine according to claim 3 , wherein the driving motor and the height adjusting motor are both positive and negative double-rotation motors. 5 .