CN117842359A - Novel electric drive power device - Google Patents

Abstract

The invention belongs to the technical field of power devices of aircrafts, and particularly relates to a novel electric driving power device.

Description

Novel electric drive power device

Technical Field

The invention belongs to the technical field of aircraft power devices, and particularly relates to a novel electric drive power device.

Background

Driven by technological advances and pursuing the concept of sustainable development, electrification of vehicles has become a necessary trend of development. For aircraft, electrification of the drive is a fundamental and precondition for electrification throughout the aircraft industry.

Most of the existing aircrafts use the power of an internal combustion engine, and compared with the existing aircraft, the electric propulsion system has the advantages of simple structure, simplicity and convenience in operation, low maintenance cost, high efficiency, safety, reliability and the like. The technical challenges facing the development of various electric aircrafts are that the key performance of a power device is insufficient, and the improvement of the energy efficiency and the improvement of the safety reliability of the power device are great challenges for the design of the electric aircrafts in the scene of high power requirements of active civil aircrafts, helicopters and the like.

Disclosure of Invention

The invention provides a novel electric driving power device for providing power for an electric aircraft, which comprises a box body, more than two groups of driving motors, an inverter, a driving wheel, a driven wheel, a speed reducing mechanism formed by the driving wheel and the driven wheel, a central bearing and a power device output end, wherein the more than two groups of driving motors are distributed in a sun-planet mode in a radial space plane taking the power device output end as a rotation center, and are connected in parallel to drive more than one group of speed reducing mechanisms.

A novel electrically driven power plant comprising: the power device output end refers to a rotation center shaft of power output of the speed reducing mechanism, and can be the rotation center power device output end of one group of speed reducing mechanisms or the rotation center power device output end of a plurality of groups of speed reducing mechanisms which are connected in series.

The central bearing is arranged on a group of bearings at the central position of the box body and used for supporting the installation of the driven wheel and the output end of the power device and mainly bearing most of the load when the novel electric driving power device operates.

The driving motor refers to a permanent magnet synchronous driving motor in the form of a radial magnetic flux inner rotor, and is called the driving motor for short.

The inverter is a current conversion device and comprises an inverter bridge, control logic and a filter circuit, and is mainly used for controlling a driving motor.

The speed reducing mechanism consists of a driving wheel and a driven wheel, and plays roles in reducing the rotating speed of the driving motor and improving the torsion.

The unidirectional bearing consists of an inner ring, an outer ring, a retainer and a special-shaped roller (special-shaped needle roller), and is a clutch for transmitting unidirectional rotation (forward rotation or reverse rotation) power.

The invention has the effects that: 1. the power redundancy is improved, and the safety and reliability are improved; 2. speed and torque reduction; 3. maintenance cost is reduced; 4. the energy efficiency is improved.

Drawings

In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or technical solutions will be briefly described below.

FIG. 1 is a schematic diagram of energy transfer;

FIG. 2. Parallel gear drive form;

FIG. 3. Tangential screw roller drive version;

FIG. 4. Parallel synchronous pulley drive format;

FIG. 5 illustrates a centered arc bevel gear drive;

FIG. 6 is a schematic view of a one-way bearing structure for the drive wheel.

Wherein: a power plant output 100; a center bearing 101; a case 102; a drive motor 103; a driven wheel 104; a driving wheel 105; an inverter 106; a speed reducing mechanism 109; a steel sheath 301; a one-way bearing 302; a bearing 303; and a motor output shaft 304.

Detailed Description

The invention provides a novel electric driving power device, which has the core forms that: the two or more groups of driving motors 103 are in planetary distribution parallel connection to drive one or more groups of speed reducing mechanisms 109 to continuously output power. The purpose of the electric power generation device is to provide electric driving force for the aircraft power piece, ensure continuous output and minimum output of the electric driving force, and enable the active aircraft to rapidly evolve into an electric aircraft. The continuous output of the electric driving force means that each driving motor 103 can be selectively kept running and stopped according to the output command of the onboard computer of the aircraft during the running process of the invention, so as to keep the stability and the continuity of the required power output. The minimum output of the electric driving force refers to: before engineering design begins, engineering measures are taken to ensure that an aircraft does not have a disaster accident in the cruising period and meet the minimum lift force requirement of the aircraft, namely, the minimum rotation speed and the minimum torque generated by a group of driving motors 103.

The invention comprises a box 102, more than two groups of driving motors 103, more than one group of speed reducing mechanisms 109 and a power device output end 100, wherein the more than two groups of driving motors 103 are distributed in sun and planet mode by taking the power device output end 100 as the center (but not limited to the distribution mode, the distribution mode can be uniformly distributed in circumference, symmetrically distributed mode or irregularly distributed mode, and the distribution mode is required to be determined according to the actual scene requirement). According to the different spatial states of the rotation center line of the shaft of the driving motor 103 and the rotation center line of the output end 100 of the power device, the distribution forms are but not limited to the following: 1. the rotation center line of the driving motor 103 is spatially parallel to the rotation center line of the power device output end 100 (as shown in fig. 2 and 4); 2. the rotation center line of the driving motor 103 is spatially aligned with the output rotation center line (as shown in fig. 5); 3. the center line of rotation of the drive motor 103 is spatially tangential to the center line of rotation of the power plant output 100 (see fig. 3).

Depending on the form of the transmission employed by the reduction mechanism, several types of transmission are included, including but not limited to:

1. a synchronous pulley transmission form (as shown in fig. 4);

2. geared versions (as in fig. 2 and 5);

3. screw roller drive form, etc. (see fig. 3).

Development of electric vehicles shows that in order to achieve the same power performance, a driving motor with higher power and a power battery with higher capacity are needed to achieve the target performance without installing a speed reducing mechanism, so that the weight and the volume are increased, and the range and the economy are reduced. The invention installs the speed reducing mechanism 109 between the driving motor 103 and the power device output end 100, which not only avoids the above-mentioned disadvantages, but also optimizes the power output, protects the driving motor 103 and reduces the maintenance cost.

The invention controls the corresponding driving motors 103 through more than two groups of inverters 106, drives the speed reducing mechanism 109 in parallel, and provides electric driving force for the aircraft through the power device output end 100. By parallel drive is meant that a single drive motor 103 drives the entire reduction mechanism 109 and that during operation, if either the individual drive motor 103 or the inverter 106 fails, this will not have a significant impact on the proper operation of the drive. The parallel driving effect can be achieved mainly because the unidirectional bearing 302 and the planetary distribution form of the multiple driving motors 103 are arranged between the driving wheel 105 and the driven wheel 104. Meanwhile, corresponding differences (such as manufacturing tolerance, assembly tolerance, use environment difference, electric signal transmission difference, etc.) exist in both the manufacturing of the components of each mechanism and the working state of the driving motor 103, and the one-way bearing 302 is installed between the driving motor 103 and the driving wheel, so that the stability and the continuity of the power output can be ensured.

The gear transmission with a simpler transmission structure is taken as an example for the detailed description:

as shown in fig. 1, 2 and 6, the features of the geared electric drive include: the power device comprises a power device output end 100, a central bearing 101, a box body 102, a driving motor 103, a driven wheel 104, a driving wheel 105, a speed reducing mechanism 109 formed by the driven wheel 104 and the driving wheel 105, an inverter 106, a one-way bearing 302, a built-in steel sleeve 301, a bearing 303, a plurality of standard mechanical fasteners (such as 300) and the like.

The box 102 is made of aluminum alloy and is mainly used for installing various necessary parts, and has the functions of protection, sealing, heat dissipation, installation and fixation and the like.

A set of bearings, central bearing 101, is mounted in the center of housing 102 to support the installation of driven wheel 104 with power plant output 100.

The power device output end 100 and the driven wheel 104 can be connected together, and a rotating rod piece made of alloy steel for outputting power can be designed to rotate positively or reversely according to actual requirements.

The driving motor 103 is installed inside the case 102, and is generally an aviation authentication type driving motor, and a single driving motor and a single inverter form a driving unit, and the inverter 106 controls forward rotation or reverse rotation according to actual requirements.

The driven wheel 104 is connected with the output end 100 of the power device and is driven to rotate by the driving wheel 105.

The driving wheels 105 are distributed around the driven wheel 104 in a planetary manner, are correspondingly arranged with the driving motor 103, and are driven in a gear meshing manner. The transmission structure between the driving wheel 105 and the driven wheel 104 is simply referred to as a speed reducing mechanism 109, and the speed reducing ratio of the driving wheel 105 to the driven wheel 104 is determined according to actual requirements.

The inverters 106 are connected to the drive motors 103, and each inverter 106 controls a corresponding one of the drive motors 103 for receiving start, stop, and brake signals for controlling the start, running speed, stop, and brake of the drive motor.

The one-way bearing 302 is arranged in the driving wheel 105, wherein an inner hole surface of a steel sleeve 301 arranged in the one-way bearing 302 is fixedly connected with the outer circle surface of an output shaft of the driving motor 103, and the outer circle surface of the one-way bearing 302 is fixedly connected with the inner hole surface of the driving wheel 105. The main functions of the power transmission mechanism are as follows: 1. one-way power transmission; 2. overrunning clutch; 3, separating the power piece.

Bearings 303 are symmetrically mounted on both sides of the one-way bearing 302.

The standard mechanical parts (such as 300) are mainly bolts, nuts, snap springs, keys, sealing rings, oil liquid and the like, and are used for assembling, fixing, sealing, cooling and lubricating the parts.

The helicopter will now be described using the present invention as a power plant. Before taking off, all the equipment can be normally used, all the inverters 106 are controlled by helicopter flight control transmission signals, the power battery outputs required electric energy to the corresponding driving motor 103 under the control of each inverter 106, each inverter 106 drives the corresponding driving motor 103 to rotate by controlling a certain current value, at the moment, the unidirectional bearing 302 forms a locking state under the state of rotating output power of the driving motor 103, each driving motor 103 generates approaching power to drive the corresponding driving wheel 105 to rotate in the same direction and rotating speed, and because each driving motor 103 and each inverter 106 have corresponding differences in manufacturing and operating, even in a circumference uniform distribution form, the power generated by each group of power units cannot be guaranteed to be completely the same, namely the driving force generated by the driving wheel 105 is unevenly distributed and can only be approaching. Each driving wheel 105 rotates to generate driving force to drive the driven wheel 104 to rotate, and finally, all the driving power generated by the driving motors is intensively output by the output end 100 of the power device driven by the driven wheels, when the inverter 106 increases current to enable the driving motor 103 to rotate in an accelerating way, the output power enables the lift force generated by the rotor to overcome the gravity of the helicopter, and the helicopter can take off.

When the helicopter needs to reduce the power output during cruising, the power generated by the power device can be reduced by controlling the rotation speed of all the driving motors 103, or the rotation speed of a plurality of driving motors can be reduced or the driving motors can be stopped in a standby state (the number of the driving motors is controlled specifically and is the relative number which needs to be calculated repeatedly according to the actual situation and is not determined in detail here). When the output speed (the linear speed of the outer circumferential surface of the steel sleeve 301 arranged in the unidirectional bearing 302) is lower than the idle speed [ the linear speed of the inner circumferential surface of the outer ring of the unidirectional bearing 302 ], the unidirectional bearing 302 is in a separated state, the driving wheel 105 is driven by the driven wheel to idle, the driving motor is in a stopped state, and when the individual driving motor or the inverter fails and cannot normally operate, the corresponding unidirectional bearing is also in a separated state. On the contrary, when the power output needs to be increased, the rotation speed of all the driving motors 103 can be increased, or the driving motors which are originally in a speed reduction or stopping state can be accelerated to rotate, and when the output line speed is greater than the idle line speed, the unidirectional bearing 302 enters the torsion locking state again from the separation state, so that the driving wheel is driven to rotate to output power.

When the helicopter needs to land, the power device is used for decelerating and moving to a destination, and the principle and the mode for controlling the power are similar to the steps.

As with all energy conversion devices, the energy conversion efficiency of the invention can be changed according to the type, number, spatial arrangement structure of the driving motors and the transmission mode of the speed reducing mechanism. Because the permanent magnet driving motor is adopted as the driving motor, the motor is easy to demagnetize at high temperature, and a heat dissipation device is needed to be matched in most application scenes, the motor can adopt a non-conductive and non-magnetic oil cooling heat dissipation mode.

In some situations where power output in opposite directions is required, such as coaxial counter-rotating fans or coaxial counter-rotating twin rotors of a helicopter, the present invention may also take a suitable form to meet the requirement for power output in opposite directions, as shown in fig. 5, where two or more sets of drive motors 106 and drive wheels 105 drive two driven wheels 104 in parallel, and may rotate the two power plant output ends 100 in opposite directions. This figure is merely illustrative of one type of multiple power plant output configuration, and others are not meant to be limiting.

In some cases, the driving motors with different volume powers are combined with the adaptive driving wheels to respectively drive the same driven wheel, for example, a gear transmission form formed by driving 7 teeth by more than two groups of driving motors with 10 kilowatts is combined with a gear transmission form formed by driving 13 teeth by more than two groups of driving motors with 4 kilowatts, so that high performance and high efficiency are brought under the application of multiple scenes, and the processor chip in the intelligent mobile phone is divided into a large core architecture and a small core architecture.

In some cases, a helicopter (such as an S-97 helicopter of the westky company) pursuing high-speed flight and provided with a forward thrust device is pursued, when the forward flight speed reaches a certain value, the forward airflow can push the main rotor to generate enough lifting force, so that the driving motor does not need to provide power for the main rotor, the helicopter can fly forward at high speed under the driving of the forward thrust device, and the premise of realizing the flight condition of the rotorcraft is that a one-way clutch is assembled between a driving shaft below the main rotor and an electric driving device, and a one-way bearing can be installed between the output end of the power device of the helicopter and a driven wheel, so that the flight speed and the course can be improved.

The invention discloses a conceptual technology discussion device for solving the electromotive conception of an active aircraft, which needs to have a specific determined application scene before specific engineering implementation, and cannot specifically develop design work if the premise is lacking. As with the laws of most conceptual techniques in the industry, the application of the technology to aircrafts should also be developed to fully conduct feasibility experiments and engineering practice trials. The invention only explains the structural characteristics, and cannot be practically applied to specific scenes, and the specific application needs to be designed by combining with a plurality of factors such as the space size, the power requirement and the like of the actual scenes.

Aircraft is the first resort to safety as a vehicle. On a safety basis, there are various functional and overall performance requirements. The large-scale driving motor is difficult to maintain and has high maintenance cost due to expensive design and manufacture. During operation, the starting and braking are relatively difficult, and the energy consumption is high. The consequences of damage once an aircraft fails, using a single large drive motor as the power plant, are enormous. The invention has the following characteristics: the power unit can be produced in a standardized modularized low-cost manner, all driving devices are arranged in a centralized manner, power output is centralized, cooling and protecting devices are simple, installation and maintenance are convenient, and power redundancy is sufficient, so that a larger design space can be provided for the aircraft.

The invention is not limited to a novel electric driving power device for an aircraft, and can be combined with other speed reducing mechanisms in series to match other use scenes, such as engineering machinery, ships and other motorized modifications.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (3)

1. The utility model provides a novel electric drive power device which characterized in that: the device comprises a central bearing (101), a box body (102), more than two groups of driving motors (103), a driving wheel (105), a driven wheel (104), a speed reducing mechanism (109) formed by the driving wheel (105) and the driven wheel (104) and a power device output end (100), wherein the driving motor (103) drives the driving wheel (105) to drive the driven wheel (104) to rotate, more than two groups of driving motors (103) are distributed in a sun-planet mode in a radial space plane taking the power device output end (100) as a rotation center, and more than one group of speed reducing mechanisms (109) are driven in parallel.

2. A novel electrically driven power plant according to claim 1, characterized in that: a one-way bearing (302) is arranged between the output shaft of the driving motor (103) and the driving wheel (105).

3. A novel electrically driven power plant according to claim 1, characterized in that: a one-way bearing (302) is arranged between the power device output end (100) and the driven wheel (104).