Product Description

MagicWheel Specification
Battery Specification		Performance Specification		Dimensional Specification
Battery	18650 Lithium-ion	Max. Speed	6km/h (5 speeds)	Size	900*860*560 mm
Charging	Battery or  Direct Charging	Motor	Brushless Permanent  Magnet Motor	Max Weight  Capacity	150 kg
Charging Time	2.5 hours	Controller	Infinitics in-house	Total weight	62 kg (package)
Endurance	16 km	Motor Power	250W*2	Capacity	1 Adult
Battery Weight	3 kg	Brake	Electromagnetic	Rear Light	LED
Environment Temperature	-15°~40°	Braking  distance	0.6 meters/ dry condition 0.7 meters/wet condition	Transportation Packagings	890*590*490 690*590*560
Battery Size	115*150*250 mm	Torque	2.1 N.m	Total Volume	0.44 cbm
Cell	Automobile grade  power cell	Wading  Depth	50 mm	Material	Anodic Aluminum  Oxide (AAO)
Battery capacity	10AH 24V	Damping	Front Damper	Front wheels	omnidirectional

MagicWheel (previous known as Autour), 4 wheels electric and intelligent wheelchair with omnidirectional front wheels from originated Manufacturer, brings independence, fun, luxury and first-class experience to its users with ergonomic and aesthetics mindset.

Designed for both outdoor adventures and indoor companion, MagicWheel is a hybrid of electric wheelchair and mobility scooter.

Excellent operation experience comes from
Brush-less Permanent Magnet Motor	Durable and powerful; 100,000 hours lifespan
Intelligent Central Controller	Infinitics in-house designed Cloud ECU with OTA
Outstanding and Secure Li-ion Battery	10 Ah 24V Tesla’s 18650 Lithium-ion Cells

MagicWheel is designed for Simply Moving.

1. Simply moving by just 1 joystick and immediately stop by releasing the joystick without slipping
2. Long endurance of 16 km and the fastest speed of 6 km/h, calm and quiet
3. More practical than folding electric wheelchair, MagicWheel can be easily disassembled in to 3 pieces in 15 seconds
4. The heaviest piece is 19kg. No pressure at all to carry and store in the car trunk
5. Friendly for new users with great fun

MagicWheel is designed for All Terrain.

1. Performance of MagicWheel is distinguished from other electric wheelchair or scooter in terms of coping with complex road conditions
2. Superb accessibility and driving CZPT of MagicWheel demonstrated by the proven travel records to parks by metro and international travel by airplane and cruise
3. Barrier free to go by car, bus, metro/subway, train or plane
4. Unique and innovative omnidirectional wheels gives the best turning radium to go through narrow space

Highlights of MagicWheel’s omnidirection front wheels
The composition of each front wheel	24 small wheels
Vertical Obstacle Clearance	6 cm
Easily Turning in small spaces	76 cm the best in the market
Climbing performance	10 °
Horizontal Obstacle Clearance	15 cm

MagicWheel is designed for Safety.

1. Anti-slipping
2. Anti-turnover
3. LED warning light
4. Seat-belt
5. Rigorous product testings passed
6. Battery MSDS report

MagicWheel is designed for Comfy.

1. The backrest and armrest can be adjusted by users’ needs
2. Flip-up armrest for easy access from both sides
3. Selected T-sens sitting cushion is waterproof, anti-slip, anti-bedsore, breathable and fire retardant
4. Proven records of the CZPT of the body pressure dispersion than the normal cushions

MagicWheel is designed for Poshness.

1. Go outside with great confidence
2. Three colors available Bentley White, Porsche Gray and Ferrari Red

Q&A
Q: Can the seat height be adjusted automatically?
A: It can be adjusted manually. Usually the wheelchair is a personal item. After the angle and height are adjusted to the most comfortable status, there is no need for repeated adjustments.

Q: What material is your product made of? Is it safe enough?
A: The frame material is aviation aluminum and stamped sheet, and the shell is injection molded of ABS+PC engineering plastics. The load-bearing capacity of the whole vehicle is 150 kg. This weight can ensure that the scooter is unimpeded on the standard road surface prescribed by each country, and there will be no problems with other scooters such as slipping and rollover.

Q: Why doesn’t your scooter have 2 pedals?
A: In order to allow users to get enough movement area for their feet while sitting, without being restricted, we use a whole pedal. This pedal is very strong and can withstand 100 kg.
And our pedal can be lifted up, so that users can easily get on or get off.

Q: Is there a remote controller?
A: Yes, but that is an optional feature.

Q: Quality problems and service life of batteries?
A: The battery is a lithium battery, which uses CZPT batteries.
The power loss of our battery cell is 20% after it is charged and discharged 1,000 times, which means it will have 80% of the remaining power after 3 years normally.
If you feel that the battery is not enough, you can buy 1 battery more, which can be replaced at any time.

Q: The service life of the scooter
A: The electrical part (battery, motor, and controller) is guaranteed for 1 year, and the frame is 3 years.
The wheels are maintenance-free. The theoretical operating distance of the front wheels is 30,000 to 50,000 kilometers, the rear wheels are solid tires, and the rubber tires are maintenance-free.
The cushion can be replaced according to actual needs.
The whole scooter can basically be used for 8-10 years.

Q: Is your scooter fold-able?
A: Our scooter can be disassembled into 3 parts in 15 seconds, the heaviest part is 19 kg, which is lighter than the fold-able wheelchairs on the market and is more convenient to carry.
[Battery 2.6 kg, seat 14 kg, front frame 14 kg, rear frame 19 kg], it is very convenient to store, transport and travel. You may have seen other fold-able scooter, the weight is almost 30 kilograms, it is very heavy to move.

Q: The weight of MagicWheel?
A: MagicWheel designs for both outdoor adventure and indoor companion. The weight of MagicWheel is 50 kg, for the sake of user safety and the stability of the scooter itself.

Q: What is the seat width of MagicWheel?
A: The width of ordinary wheelchairs on the market is between 420-510mm, and ours is 460mm. Most people can use it. The width of the whole scooter is 560. Normal doors can pass through.

Q: Can MagicWheel be equipped with front lights?
A: Every users’ needs are different and diverse. Many of our users install small accessories on the scooter according to their favorite styles. It can be fitted with cup holders and bright flashlights.

Q: Can the light strip on the back be turned off?
A: The light strip at the back is a reminder to the pedestrians behind and a protection for us, especially at night or in a dark place. The power consumption is very small and can be ignored.
You can disconnect it by loosening the connection point of the wire connecting the light strip under the seat but which is NOT recommended.

Q: Does MagicWheel have emergency braking? What is the principle of braking?
MagicWheel is different from general motor brakes. It uses electromagnetic brakes. Releasing the joystick, it stops immediately.

About usage
Q: Can MagicWheels travel on planes?
A: Most airlines have rules that a single battery should not exceed 300Wh. The battery of MagicWheel is 240Wh. You need to remove the battery and bring it with you, and then the scooter body can be checked in before boarding. Please bear in mind that contact with the airline at least 48 hours in advance before the departure time.

Q: Can MagicWheel enter parks and shopping malls?
A: The speed of the MagicWheel scooter is only 6 km/h, which is about the same as the walking speed of pedestrians. It is also small in size and can enter shopping malls and parks.

Q: What should I do if I run out of power when I go out on the road?
A: There is a battery indicator on the armrest of our scooter. Observe the battery indicator before use. If you are going to have a long-distance trip, please charge it 1 day in advance.

In case of power or scooter failure, please switch the 2 red wrenches at the bottom of rear frame to manual mode, therefore it can be pushed to move.

Q: Can MagicWheel be replaced with left-handed operation?
A: Yes, if you need to use the left-handed operation, you can make a note with the customer service when you buy it. It will be set up in the factory before delivering.

Q: Can I use MagicWheel in the cold winter? What about the battery loss?
A: The battery does lose some power due to the low temperature. Users must pay attention to the power indicator and plan their own itinerary.

Q: Is your scooter easy to get started?
A: Our car uses joystick control and electromagnetic brakes, which is very friendly and suitable for the elderly to learn.

Q: Can I take the subway/metro with MagicWheel?
A: Yes, absolutely, because of the unique design of the front wheels, coupled with the powerful dual-motor drive, MagicWheel can pass the gap and enter the carriage from the platform easily without help.

Q: Can the battery be optional?
A: MagicWheel currently sells 1 type of battery only. We will update batteries of different capacities in short future.

Q: Can MagicWheel be put in the trunk of an ordinary car after disassembled? After putting it in the trunk, is it impossible to load other things?
A: Yes. Large items may not fit, but small items can still fit a lot.

Stiffness and Torsional Vibration of Spline-Couplings

In this paper, we describe some basic characteristics of spline-coupling and examine its torsional vibration behavior. We also explore the effect of spline misalignment on rotor-spline coupling. These results will assist in the design of improved spline-coupling systems for various applications. The results are presented in Table 1.

Stiffness of spline-coupling

The stiffness of a spline-coupling is a function of the meshing force between the splines in a rotor-spline coupling system and the static vibration displacement. The meshing force depends on the coupling parameters such as the transmitting torque and the spline thickness. It increases nonlinearly with the spline thickness.
A simplified spline-coupling model can be used to evaluate the load distribution of splines under vibration and transient loads. The axle spline sleeve is displaced a z-direction and a resistance moment T is applied to the outer face of the sleeve. This simple model can satisfy a wide range of engineering requirements but may suffer from complex loading conditions. Its asymmetric clearance may affect its engagement behavior and stress distribution patterns.
The results of the simulations show that the maximum vibration acceleration in both Figures 10 and 22 was 3.03 g/s. This results indicate that a misalignment in the circumferential direction increases the instantaneous impact. Asymmetry in the coupling geometry is also found in the meshing. The right-side spline’s teeth mesh tightly while those on the left side are misaligned.
Considering the spline-coupling geometry, a semi-analytical model is used to compute stiffness. This model is a simplified form of a classical spline-coupling model, with submatrices defining the shape and stiffness of the joint. As the design clearance is a known value, the stiffness of a spline-coupling system can be analyzed using the same formula.
The results of the simulations also show that the spline-coupling system can be modeled using MASTA, a high-level commercial CAE tool for transmission analysis. In this case, the spline segments were modeled as a series of spline segments with variable stiffness, which was calculated based on the initial gap between spline teeth. Then, the spline segments were modelled as a series of splines of increasing stiffness, accounting for different manufacturing variations. The resulting analysis of the spline-coupling geometry is compared to those of the finite-element approach.
Despite the high stiffness of a spline-coupling system, the contact status of the contact surfaces often changes. In addition, spline coupling affects the lateral vibration and deformation of the rotor. However, stiffness nonlinearity is not well studied in splined rotors because of the lack of a fully analytical model.

Characteristics of spline-coupling

The study of spline-coupling involves a number of design factors. These include weight, materials, and performance requirements. Weight is particularly important in the aeronautics field. Weight is often an issue for design engineers because materials have varying dimensional stability, weight, and durability. Additionally, space constraints and other configuration restrictions may require the use of spline-couplings in certain applications.
The main parameters to consider for any spline-coupling design are the maximum principal stress, the maldistribution factor, and the maximum tooth-bearing stress. The magnitude of each of these parameters must be smaller than or equal to the external spline diameter, in order to provide stability. The outer diameter of the spline must be at least 4 inches larger than the inner diameter of the spline.
Once the physical design is validated, the spline coupling knowledge base is created. This model is pre-programmed and stores the design parameter signals, including performance and manufacturing constraints. It then compares the parameter values to the design rule signals, and constructs a geometric representation of the spline coupling. A visual model is created from the input signals, and can be manipulated by changing different parameters and specifications.
The stiffness of a spline joint is another important parameter for determining the spline-coupling stiffness. The stiffness distribution of the spline joint affects the rotor’s lateral vibration and deformation. A finite element method is a useful technique for obtaining lateral stiffness of spline joints. This method involves many mesh refinements and requires a high computational cost.
The diameter of the spline-coupling must be large enough to transmit the torque. A spline with a larger diameter may have greater torque-transmitting capacity because it has a smaller circumference. However, the larger diameter of a spline is thinner than the shaft, and the latter may be more suitable if the torque is spread over a greater number of teeth.
Spline-couplings are classified according to their tooth profile along the axial and radial directions. The radial and axial tooth profiles affect the component’s behavior and wear damage. Splines with a crowned tooth profile are prone to angular misalignment. Typically, these spline-couplings are oversized to ensure durability and safety.

Stiffness of spline-coupling in torsional vibration analysis

This article presents a general framework for the study of torsional vibration caused by the stiffness of spline-couplings in aero-engines. It is based on a previous study on spline-couplings. It is characterized by the following 3 factors: bending stiffness, total flexibility, and tangential stiffness. The first criterion is the equivalent diameter of external and internal splines. Both the spline-coupling stiffness and the displacement of splines are evaluated by using the derivative of the total flexibility.
The stiffness of a spline joint can vary based on the distribution of load along the spline. Variables affecting the stiffness of spline joints include the torque level, tooth indexing errors, and misalignment. To explore the effects of these variables, an analytical formula is developed. The method is applicable for various kinds of spline joints, such as splines with multiple components.
Despite the difficulty of calculating spline-coupling stiffness, it is possible to model the contact between the teeth of the shaft and the hub using an analytical approach. This approach helps in determining key magnitudes of coupling operation such as contact peak pressures, reaction moments, and angular momentum. This approach allows for accurate results for spline-couplings and is suitable for both torsional vibration and structural vibration analysis.
The stiffness of spline-coupling is commonly assumed to be rigid in dynamic models. However, various dynamic phenomena associated with spline joints must be captured in high-fidelity drivetrain models. To accomplish this, a general analytical stiffness formulation is proposed based on a semi-analytical spline load distribution model. The resulting stiffness matrix contains radial and tilting stiffness values as well as torsional stiffness. The analysis is further simplified with the blockwise inversion method.
It is essential to consider the torsional vibration of a power transmission system before selecting the coupling. An accurate analysis of torsional vibration is crucial for coupling safety. This article also discusses case studies of spline shaft wear and torsionally-induced failures. The discussion will conclude with the development of a robust and efficient method to simulate these problems in real-life scenarios.

Effect of spline misalignment on rotor-spline coupling

In this study, the effect of spline misalignment in rotor-spline coupling is investigated. The stability boundary and mechanism of rotor instability are analyzed. We find that the meshing force of a misaligned spline coupling increases nonlinearly with spline thickness. The results demonstrate that the misalignment is responsible for the instability of the rotor-spline coupling system.
An intentional spline misalignment is introduced to achieve an interference fit and zero backlash condition. This leads to uneven load distribution among the spline teeth. A further spline misalignment of 50um can result in rotor-spline coupling failure. The maximum tensile root stress shifted to the left under this condition.
Positive spline misalignment increases the gear mesh misalignment. Conversely, negative spline misalignment has no effect. The right-handed spline misalignment is opposite to the helix hand. The high contact area is moved from the center to the left side. In both cases, gear mesh is misaligned due to deflection and tilting of the gear under load.
This variation of the tooth surface is measured as the change in clearance in the transverse plain. The radial and axial clearance values are the same, while the difference between the 2 is less. In addition to the frictional force, the axial clearance of the splines is the same, which increases the gear mesh misalignment. Hence, the same procedure can be used to determine the frictional force of a rotor-spline coupling.
Gear mesh misalignment influences spline-rotor coupling performance. This misalignment changes the distribution of the gear mesh and alters contact and bending stresses. Therefore, it is essential to understand the effects of misalignment in spline couplings. Using a simplified system of helical gear pair, Hong et al. examined the load distribution along the tooth interface of the spline. This misalignment caused the flank contact pattern to change. The misaligned teeth exhibited deflection under load and developed a tilting moment on the gear.
The effect of spline misalignment in rotor-spline couplings is minimized by using a mechanism that reduces backlash. The mechanism comprises cooperably splined male and female members. One member is formed by 2 coaxially aligned splined segments with end surfaces shaped to engage in sliding relationship. The connecting device applies axial loads to these segments, causing them to rotate relative to 1 another.