CN214375155U - Dynamic comprehensive performance test platform for hub motor system - Google Patents
Dynamic comprehensive performance test platform for hub motor system Download PDFInfo
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- CN214375155U CN214375155U CN202023025119.4U CN202023025119U CN214375155U CN 214375155 U CN214375155 U CN 214375155U CN 202023025119 U CN202023025119 U CN 202023025119U CN 214375155 U CN214375155 U CN 214375155U
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Abstract
The utility model discloses a dynamic comprehensive performance testing platform of an in-wheel motor system, which belongs to the technical field of motors and applies vertical load to a driving wheel through a loading device so as to simulate the dead weight of a vehicle; the road condition and the working condition are respectively simulated through a vibration exciter and a loading motor; various sensors are used for collecting multiple physical quantity dynamic parameters when the hub motor runs; the dynamic simulation of the traction or acceleration process of the hub motor is realized by utilizing the flywheel inertia energy storage, the dynamic simulation of the braking or deceleration process of the hub motor is realized by utilizing the flywheel inertia energy release, and the released energy can be fed back to a power grid through a frequency converter matched with the loading motor, so that the efficient utilization of the energy is realized. Therefore, the utility model discloses a whole test platform simulation test wide range, the result is true reliable, and the popularization nature is strong, has solved prior art and can't carry out the problem of complicated operating mode simulation and dynamic test to in-wheel motor, has fine application prospect.
Description
Technical Field
The utility model belongs to the technical field of the motor, concretely relates to in-wheel motor system developments comprehensive properties test platform.
Background
The hub motor is a core component of a new energy automobile represented by an electric automobile, and according to data released by the ministry of commerce, the automobile sales output in China is continuously 11 years and stably stays at the first position of the world, and the number of automobiles kept in China is about 2.6 hundred million currently. However, by the end of 2019, the reserve of new energy automobiles in China only accounts for about 1.49% of the total amount of automobiles. With the advance of national policy, new energy vehicles have no irreversible trend to replace traditional fuel vehicles.
The technical breakthrough in the field of the hub motor has important significance for new energy automobiles, particularly electric automobiles to master market first opportunity and occupy market share in China and the world, and the direct economic benefit of the new energy automobiles is huge. The hub motor technology has potential application value in military, agriculture, fire fighting, service and other industries, and the indirect economic benefit is quite obvious. In addition, breakthrough of key technologies of the hub motor inevitably promotes development of new energy vehicles and other related industries towards a low-carbon direction, gradually reduces influence of traditional energy vehicles on environmental ecology, and effectively plays roles of energy conservation and emission reduction. In the foreseeable future, the in-wheel motor market is very huge and will continue to grow vigorously.
Although the hub motor industry is rapidly developed, the situation is contradictory to the situation that the industry related to the hub motor test is relatively lagged or even not lagged. At present, wheel hubs adopted by manufacturers and research institutions for producing hub motors are different, design ideas are different, and no unified standard exists, so that a platform which is professional and rapid and can carry out comprehensive dynamic testing on the hub motors is required in the market.
SUMMERY OF THE UTILITY MODEL
To prior art's defect and improvement demand, the utility model provides an in-wheel motor system developments comprehensive properties test platform, its aim at solve prior art can't carry out the technical problem of complicated operating mode simulation and dynamic test to in-wheel motor.
In order to achieve the above object, the utility model provides a wheel hub motor system developments comprehensive properties test platform, include:
a drive wheel;
the hub motor is embedded in the driving wheel;
the first driving device is electrically connected with the hub motor to control the starting, the stopping and the running rotating speed of the hub motor;
the loading device, the pressure sensor and the vibration exciter are connected with the driving wheel shaft; the pressure sensor is used for measuring the pressure transmitted to the driving wheel by the loading device, and the vibration exciter is used for simulating different road conditions;
the test accompanying wheel is in contact with the driving wheel, so that the driving wheel drives the test accompanying wheel to rotate;
the rotating speed and torque sensor, the loading motor and the flywheel are sequentially connected with the test accompanying wheel in a shaft mode, and the second driving device is electrically connected with the loading motor to drive the loading motor; the rotating speed and torque sensor is used for measuring the rotating speed and the torque of the test wheel, the loading motor is used for simulating different working conditions, and the flywheel is used for simulating different inertias.
Further, still include:
the speed increaser is positioned between the loading motor and the flywheel so as to increase the rotating speed of the flywheel when the rated rotating speed of the hub motor is small.
Furthermore, the speed increaser is of a parallel shaft type, is horizontally arranged, adopts an involute helical gear and is driven by a single-stage gear.
Further, still include:
the cooling device is sleeved on the periphery of the stator core of the hub motor and adopts a cooling structure of circulating water cooling.
Further, the loading device transmits pressure to the driving wheel through a screw transmission mechanism.
Furthermore, the spiral transmission mechanism consists of a nut and a screw rod, and the sliding spiral can realize self-locking; and the screw nut and the screw rod are used for converting the spiral motion into linear motion to apply load to the driving wheel.
Furthermore, the rotating speed and torque sensor is connected with the output shaft of the test wheel, and the rotating speed and the torque are measured by adopting a photoelectric code disc method; when the speed measuring code disc continuously rotates, a pulse signal with a certain period width is output through the photoelectric switch, and the corresponding rotating speed is calculated according to the frequency of the output signal and the number of teeth of the code disc; and in the effective range, calculating corresponding torque according to the linear relation between the torque and the output frequency.
Further, the driving wheel and the test accompanying wheel are both internally provided with bearings, and the test accompanying wheel and the flywheel are in shaft transmission.
Further, the pressure sensor is a resistance strain gauge sensor.
Generally, through the utility model discloses above technical scheme who conceives can gain following beneficial effect:
(1) the utility model applies vertical load to the driving wheel through the loading device to simulate the dead weight of the vehicle; the typical working conditions of acceleration/deceleration, uniform-speed running, turning and the like of a vehicle on the road surfaces of flatness, potholes, gravels, sudden bulges/pits, uphill and downhill and the like are simulated through a vibration exciter and a loading motor; various sensors are used for collecting multiple physical quantity dynamic parameters when the hub motor runs; the dynamic simulation of the traction or acceleration process of the hub motor is realized by utilizing the flywheel inertia energy storage, the dynamic simulation of the braking or deceleration process of the hub motor is realized by utilizing the flywheel inertia energy release, and the released energy can be fed back to a power grid through a frequency converter matched with the loading motor, so that the efficient utilization of the energy is realized. Therefore, the utility model discloses a whole test platform simulation test wide range, the result is true reliable, and the popularization nature is strong, has solved prior art and can't carry out the problem of complicated operating mode simulation and dynamic test to in-wheel motor, has fine application prospect.
(2) The utility model discloses a speed increaser is connected to the input at the flywheel for under the lower condition of the in-wheel motor rotational speed of being tested, the rotational speed of rising flywheel, thereby when guaranteeing to reduce the volume and the quality of flywheel, do not influence the simulation to car inertial energy.
(3) The utility model discloses well loading device uses screw drive mechanism to wheel hub motor transmission pressure, and the rotary motion with the driving part that can be convenient turns into the linear motion of follower, and screw drive mechanism comprises nut, screw rod, and the spiral that just slides can realize the auto-lock. When the device is applied to a vertical load simulation mechanism, the screw motion is converted into linear motion through the nut and the screw rod to apply load to the electric wheel.
Drawings
Fig. 1 is a schematic structural view of a dynamic comprehensive performance testing platform of an in-wheel motor system provided by the present invention;
the same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1 is a first driving device; 2 is a hub motor; 3 is a cooling device; 4 is a driving wheel; 5 is a loading device; 6 is a pressure sensor; 7 is a vibration exciter; 8 is an accompanying test wheel; 9 is a rotating speed torque sensor; 10 is a loading motor; 11 is a second driving device; 12 is a speed increaser; and 13 is a flywheel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Referring to the figure 1, for the utility model provides a pair of in-wheel motor system developments comprehensive properties test platform structure sketch map, the platform includes in-wheel motor system and accompanies the examination system, and wherein in-wheel motor system includes first drive arrangement 1, in-wheel motor 2, cooling device 3 and drive wheel 4, accompanies the examination system and includes loading device 5, pressure sensor 6, vibration exciter 7, accompanies examination wheel 8, rotational speed torque sensor 9, loading motor 10, second drive arrangement 11, speed increaser 12, flywheel 13.
Specifically, the first driving device 1 is directly connected with the in-wheel motor 2 and controls the starting, braking and running rotating speed of the in-wheel motor 2; the hub motor 2 is embedded in the driving wheel 4.
The loading device 5 is connected to a connecting shaft of the driving wheel 4, applies a vertical load to the driving wheel 4 to simulate the self weight of the vehicle on a real road surface, and can simulate the condition that the vehicle is empty or full by changing the vertical load. The loading device 5 transmits pressure to the hub motor 2 by using a spiral transmission mechanism, can conveniently convert the rotary motion of a driving part into the linear motion of a driven part, the spiral transmission mechanism consists of a nut and a screw rod, and the sliding spiral can realize self-locking; when the device is applied to a vertical load simulation mechanism, the screw motion is converted into linear motion through the nut and the screw rod to apply load to the electric wheel.
In order to control the pressure transmitted to the in-wheel motor 2 by the loading device 5, the loaded pressure needs to be measured, a pressure sensor 6 is connected between the loading device 5 and the driving wheel 4 to measure the vertical load applied to the in-wheel motor 2, and the pressure sensor 6 can be a resistance strain gauge sensor.
The vibration exciter 7 is connected to the connecting shaft of the driving wheel 4 through a connecting shaft, and the vibration exciter 7 can adopt a disc type motor to apply vertical vibration to the in-wheel motor 2 so as to simulate the running condition of a vehicle on an uneven road surface.
The test assisting wheel 8 is of a hollow steel structure, is directly contacted with the driving wheel 4, and is connected with the flywheel 13 as an inertia simulation device to simulate the inertia of a road surface and a part of the whole vehicle.
The rotating speed and torque sensor 9 is connected with an output shaft of the test wheel 8, the rotating speed and torque of the sensor are measured by adopting a method of a photoelectric coded disc, when the speed measuring coded disc continuously rotates, a pulse signal with a certain period width is output through a photoelectric switch, and the corresponding rotating speed is calculated according to the frequency of the output signal and the number of teeth of the coded disc; in the effective range, the corresponding torque can be calculated according to the linear relation between the torque and the output frequency. The measurements of speed and torque provide data for control of the test.
The loading motor 10 is connected with the rotating speed and torque sensor 9 through a connecting shaft, the second driving device 11 controls the loading motor 10, different resistance characteristics of the vehicle under different operating conditions can be simulated, such as acceleration and deceleration, turning, ascending and descending and the like, and the purpose of testing the dynamic comprehensive performance of the hub motor is achieved.
The flywheel 13 is used as the main inertia load in the locomotive test and simulates different resistance characteristics in real operation. The flywheel 13 is made of solid disc steel and is connected with the loading motor 10 through a connecting shaft. The dynamic simulation of the traction or acceleration process of the hub motor is realized by utilizing the flywheel inertia energy storage, the dynamic simulation of the braking or deceleration process of the hub motor is realized by utilizing the flywheel inertia energy release, and the released energy can be fed back to a power grid through a frequency converter matched with the loading motor, so that the high-efficiency utilization of the energy is realized.
Under the condition that the rotating speed of the hub motor to be tested is low, in order to reduce the volume and the mass of the flywheel and not influence the simulation of the inertia energy of the automobile, a speed increaser 12 can be connected to the input end of the flywheel so as to increase the rotating speed of the flywheel. The speed increaser 12 is of a parallel shaft type, is horizontally arranged, and adopts an involute helical gear and single-stage gear transmission.
The following describes the present invention with an example of an in-wheel motor with a rated power of 45kW, a maximum power of 100kW, and a rated rotation speed of 1460 r/min.
At first carry out size design to the flywheel, the utility model discloses be used for studying single electric wheel, the event only simulates the quarter car heavy, and the car weight is 1000kg when getting the car empty load, and auto wheel rolling radius is got for 400mm, and the event simulation car weight m is 250kg, and the car speed of travel
So that the total kinetic energy of the vehicle running on the road at the rated speed
The flywheel is a solid disc type, and the expression of the moment of inertia is as follows:
the test wheel is of a hollow steel structure, and the expression of the rotational inertia is
Q235 carbon steel is selected as the material of the flywheel and the test wheel, and the density rho is 7800kg/m3Tensile Strength σh1200MPa, specific strength sigmah/ρ＝1.54×105Pa/(kg/m3). Radius R of taking and accompanying test wheel1300mm, width B of test wheel1500mm, thickness D 110 mm. The rotational inertia of the test wheel can be calculated through the test wheel inertia expression
When the driving wheel rotates at the rated speed, the angular speed omega of the wheel is accompanied1＝2πn02 pi x 24.33 r 152.89rad/s, so the rotation energy of test wheel
Rotational kinetic energy of flywheel
If neglecting the rotational kinetic energy of other rotating parts and the lost energy, the entire rotating part has the rotational kinetic energy of E1+E2。
The whole experiment bench satisfies E0＝E1+E2The rotational kinetic energy E of the flywheel can be obtained2＝E0-E1-E3The moment of inertia of the flywheel can be calculated from 467.59-73.52-394.07 kJ
Taking radius R of flywheel2400mm (this parameter may be as appropriate)Selected), then the expression according to the moment of inertia is:
the width B of the flywheel can be calculated2100 mm. According to a defined formula
And (4) checking calculation:
the strength requirement is met.
In the case of using the speed increaser, the speed increaser speed ratio i is selected to be 1.4 so as to prevent the over-speed of the loading motor without influencing the simulation of the inertia energy of the automobile, so that the maximum angular speed omega 'is obtained when the flywheel rotates'2＝ω2X 1.4 158.89 × 1.4 213.96 rad/s. The calculation process is the same as above, and the flywheel rotational inertia can be finally calculated
Similarly, take the flywheel radius r2400mm (this parameter can be chosen as the case may be), the expression according to the moment of inertia is:
the flywheel width B 'can be calculated'254.89 mm. The flywheel thickness that obtains of calculating this moment compares and has obvious reduction when not connecing the speed increaser, concrete implementation the utility model discloses the cost that the speed increaser increased and the cost that the flywheel was practiced thrift can specifically be compared in the time, select the optimal implementation scheme.
If the loading motor is used, typical working conditions of the electric automobile such as ascending and descending, acceleration/deceleration, constant-speed running and turning can be simulated. And calculating the power required by the loading motor by taking the example that the experiment requires that the simulated electric automobile accelerates for 5s on the road (the rotating speed of the hub motor rises from 200r/min to 1000 r/min).
Power P of loaded motor2Constant power P of hub motor1And equivalent power P of flywheel3Determining:
P2＝P1-P3
the equivalent power of the flywheel is determined by the highest angular velocity omega of the test wheelMAXContinuous speed omega of test wheelNAnd the running inertia J of the test-accompanying wheel0And determining the constant power operation time t of the hub motor:
power P of motor to be loaded2＝P1-P345-35.49 is 9.51kW, so that the requirement can be met by selecting a loading motor with the rated power of 10kW and the rated rotating speed of 1460 r/min.
Different loads can be added to the hub motor through the loading motor to simulate the resistance required under different road conditions, and the loading motor can work in two modes of power generation and electromotion, for example, the loading motor provides the load for the hub motor when the simulated vehicle accelerates, and the loading motor works in a power generation mode and feeds back to a power grid through a matched frequency converter when the simulated vehicle decelerates, so that the efficient utilization of energy is realized.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The utility model provides an in-wheel motor system developments comprehensive properties test platform which characterized in that includes:
a drive wheel (4);
the hub motor (2) is embedded in the driving wheel (4);
the first driving device (1) is electrically connected with the hub motor (2) to control the starting, stopping and running rotating speed of the hub motor (2);
the loading device (5) is connected with the driving wheel (4) in a shaft mode, the pressure sensor (6) and the vibration exciter (7) are arranged on the driving wheel; the pressure sensor (6) is used for measuring the pressure transmitted by the loading device (5) to the driving wheel (4), and the vibration exciter (7) is used for simulating different road conditions;
the test accompanying wheel (8), the test accompanying wheel (8) is in contact with the driving wheel (4), so that the driving wheel (4) drives the test accompanying wheel (8) to rotate;
the device comprises a rotating speed and torque sensor (9), a loading motor (10), a flywheel (13) and a second driving device (11), wherein the rotating speed and torque sensor, the loading motor (10) and the flywheel (13) are sequentially connected with the test accompanying wheel (8) in an axial mode; the rotating speed and torque sensor (9) is used for measuring the rotating speed and the torque of the test wheel (8), the loading motor (10) is used for simulating different working conditions, and the flywheel (13) is used for simulating different inertias.
2. The in-wheel motor system dynamic combination property test platform of claim 1, further comprising:
a speed increaser (12), the speed increaser (12) being located between the loading motor (10) and the flywheel (13).
3. The in-wheel motor system dynamic comprehensive performance test platform according to claim 2, characterized in that the speed increaser (12) is of a parallel shaft type, is horizontally arranged, and adopts an involute helical cylindrical gear and is driven by a single-stage gear.
4. The in-wheel motor system dynamic combination property test platform of claim 1, further comprising:
the sleeve is arranged on a cooling device (3) on the periphery of a stator core of the hub motor (2), and the cooling device (3) adopts a cooling structure of circulating water cooling.
5. The in-wheel motor system dynamic comprehensive performance test platform as claimed in claim 1, wherein the loading device (5) transmits pressure to the driving wheel (4) through a screw transmission mechanism.
6. The platform for testing the dynamic comprehensive performance of the in-wheel motor system according to claim 5, wherein the screw transmission mechanism is composed of a nut and a screw rod, and a sliding screw can realize self-locking; and the screw nut and the screw rod convert the spiral motion into linear motion to apply load to the driving wheel (4).
7. The in-wheel motor system dynamic comprehensive performance test platform as claimed in claim 1, wherein the rotating speed torque sensor (9) is connected with the output shaft of the test wheel (8).
8. The in-wheel motor system dynamic comprehensive performance test platform according to claim 1, characterized in that bearings are arranged in the driving wheel (4) and the test assisting wheel (8), and the test assisting wheel (8) and the flywheel (13) are in shaft transmission.
9. The in-wheel motor system dynamic comprehensive performance test platform as claimed in claim 1, wherein the pressure sensor (6) is a resistance strain gauge sensor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117606822A (en) * | 2024-01-24 | 2024-02-27 | 华芯(武汉)智能装备有限公司 | Handling equipment testing system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117606822A (en) * | 2024-01-24 | 2024-02-27 | 华芯(武汉)智能装备有限公司 | Handling equipment testing system and method |
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