Patent Application
20230052856
The present invention relates to a power generating device, and more particularly, relates to an electric vehicle with electromagnetic induction generating device.
At present, the conventional electric vehicle is driven by the electric energy provided by the on-board battery (single energy source). Since the capacity of the battery is limited, there will inevitably be an issue that the battery energy is exhausted and the electric vehicle will not run, which will cause the driver to be trapped on the road. As for the hybrid electric vehicle, because it retains the mechanical transmission system and the fuel engine, its system efficiency is low, which is unfavorable to the trend of energy saving, emission reduction, and low-carbon economy.
Among them, the above-mentioned vehicles are driven only by electricity. One possible disadvantage of this type of known or commercially available engine (motor) is frequent charging requirements, which must be fulfilled by domestic or commercial charging stations. This kind of pure electric vehicle has the additional disadvantage of having a short and impractical driving range before it needs to be charged.
Therefore, in the field of electric vehicles, especially in the field of power generation and/or improved transmission system, there is a need to extend the operable travel distance of vehicles driven only or partly by electricity, including hybrid vehicles using power converter components. The power converter assembly proposed to solve the above-mentioned problems should utilize the basic energy provided by the continuous rotation of the vehicle's non-driving wheels, and the supplementary current provided in this way is sufficient to maintain sufficient and operable charges on the installed battery components associated with electric vehicles. In addition, the energy converter assembly proposed in this preferred embodiment should be able to convert the mechanical energy generated by the rotation of the vehicle's non-driving wheels into sufficient auxiliary electric current, which can not only maintain the charge on the battery power supply associated with this type of vehicle, but also independently or appropriately powers the vehicle and/or auxiliary electronic components (such as personal electronic equipment) commonly used with the vehicle.
Since its invention, the generator has been playing the core device of electricity generation, and its main function is to convert mechanical energy into electrical energy. Mechanical energy can come from internal combustion engines, turbofans, compressed air, etc., or mechanical energy from other sources. In practical applications, generators provide almost all of the electric power for power grids. Therefore, based on factors such as environmental protection and environmental sustainability, how to improve power generation efficiency is an important issue.
The motor converts electrical energy into mechanical energy by reverse operation, and there are many similarities between the motor and the generator.
Generators and motors (such as AC induction or DC permanent magnet motors) generally include an external stator or fixed component, which is usually hollow cylindrical and includes wire coils arranged on the inner sidewalls thereof. For motor applications, current flows into a plurality of pairs of coils arranged in the stator (three-phase motor usually contains three pairs of separate coils, which are arranged in a manner that is opposite and partially offset along the circumferential direction), causing the internally positioned rotor assembly to rotate.
The rotor is usually a solid cylinder fixed inside the stator (with a definite air gap between the outer cylindrical surface of the rotor and the inner surface of the stator), and its outer shaft extends outward from the axial centerline of the rotor.
Existing electric motors or generators contain components with iron sheets, such as laminated steel sheets or silicon steel sheets, which are used as the stator coil winding cores. The magnetic field generated by these components can interact with the permanent iron on the rotor to reduce power generation efficiency.
Based on the aforementioned disadvantages of insufficient endurance of pure electric vehicles before they need to be recharged, a high-efficiency energy converter assembly, that is, an electromagnetic induction power generation device that can be integrated in electric vehicles, can especially be integrated in the free-running wheels of the vehicle. It is necessary to convert the mechanical energy generated by free-running wheels of the vehicle into sufficient auxiliary electric current to charge the battery pack installed in the electric vehicle.
In order to solve the above drawbacks of the insufficient endurance of pure electric vehicles, a high-efficiency power converter assembly is required to convert the mechanical energy generated by the rotation of the vehicle's free-running wheels into sufficient auxiliary electric current. The present invention provides an electric vehicle capable of integrating a high-efficiency electromagnetic induction power generation device.
A high-efficiency and iron-loss-free generator can be realized by arranging the coil windings using only copper wires into suitable coil winding stacks and integrating them into a rotor assembled with permanent magnets.
Based on the above objective, the present invention proposes an electric vehicle with an electromagnetic induction power generation device, which includes an vehicle body, at least one battery pack installed inside the vehicle body, at least one power generation device electrically coupled to the at least one battery pack for providing electricity, a transmission device placed between the battery pack and the power generating device, and at least one motor for driving the electric vehicle, wherein the at least one power generating device can be coupled to at least one free-running wheel of the vehicle for converting a rotating energy of the at least one free-running wheel into electricity.
In one preferred embodiment, the at least one power generating device includes a cylindrical shell, a stator assembly having a plurality stator units axially and equal spaced fixed inside the cylindrical shell, each stator unit including a stator base and a plurality of coils azimuthally arranged within the stator base with equal radical angle distribution, and a rotor assembly having a plurality of rotor units, each rotor unit including a rotor base and a plurality of permanent magnets azimuthally arranged inside the rotor base with equal radical angle distribution, wherein the plurality of rotor units are connected by a rotation shaft for rotating coherently and each rotor unit is arranged in between neighboring stator units.
In one preferred embodiment, the stator base is a cylindered shape having a center hole for passing the rotation shaft.
In one preferred embodiment, the stator base has a space formed between a circular inner wall and a circular outer wall for accommodating the coils.
In one preferred embodiment, the space formed between the circular inner wall and the circular outer wall of the stator base is equally partitioned into two subsections along its axial direction.
In one preferred embodiment, the coils installed inside both of the subsections of the stator base.
In one preferred embodiment, each of the coils is winded by enamel-insulated conducting wire and forms a loop structure with bended “Z” shape cross section.
In one preferred embodiment, each of the coils is partially stacked on top of each other side by side for forming compact packing.
In one preferred embodiment, the stator base is non-magnetic.
In one preferred embodiment, the rotor unit includes a non-magnetic cylindered rotor base having a center hole for coupling the rotation shaft.
In one preferred embodiment, magnetic poles of neighboring permanent magnets have opposite magnetic polarity arranged alternatively.
In one preferred embodiment, each of the permanent magnets is a columnar with equilateral triangular cross section and the permanent magnets are arranged to have their individual bisector aligned with a set of radical axes of the rotor base with equal radical angle distribution.
In one preferred embodiment, base of the permanent magnets with a first type of the magnetic polarity are configured to face toward center of the rotor base while the base of permanent magnets with a second type of the magnetic polarity are configured to face toward outer edge of the rotor base.
In one preferred embodiment, the second type the magnetic polarity is N polarity.
In one preferred embodiment, the second type the magnetic polarity is S polarity.
In one preferred embodiment, each of the permanent magnets is a NdFeB magnet
The components, characteristics and advantages of the present invention may be understood by the detailed descriptions of the preferred embodiments outlined in the specification and the drawings attached:
Some preferred embodiments of the present invention will now be described in greater detail. However, it should be recognized that the preferred embodiments of the present invention are provided for illustration rather than limiting the present invention. In addition, the present invention can be practiced in a wide range of other embodiments besides those explicitly described, and the scope of the present invention is not expressly limited except as specified in the accompanying claims.
The “first”, “second”, etc. used herein do not specifically refer to order or sequence, nor are they used to limit the present invention. They are only used to distinguish between elements or operations described in the same technical terms.
Regarding the “connected” or “electrical coupled” used in this specification, it can mean that two or more components are directly physically connected or electrically contacted with each other, or indirectly physically connected or electrically contacted with each other, and ““connected” or “electrically coupled” can also refer to two or more components interoperating or acting.
To solve the issue of insufficient endurance of pure electric vehicles, a high-efficiency power converter assembly is required to convert the mechanical energy of the rotation of the vehicle's free-running wheels into sufficient auxiliary electric current. The present invention proposes a high-efficiency electromagnetic induction power generation device that can be integrated in an electric vehicle.
When the vehicle is in a balanced mode (that is, carrying a normal load on a level road without accelerating), the power generating devices (10a, 10b) are respectively combined with the gearboxes (14a, 14b) to provide a certain amount for the battery pack 7a, the motor 1a draws power from the battery pack 6a, the capacity of the power generating devices (10a, 10b) are set to provide a predetermined amount of energy to the battery pack 7a. As the speed of the vehicle speed decreases, electrical or mechanical signals are sent to the gearboxes (14a, 14b) through the controller (control center) 13a, which changes the gear ratio to increase the speed of the gearboxes (14a, 14b). The power generating devices (10a, 10b) maintain a predetermined electrical input to the battery pack 7a. The same is true when the battery pack 6a forms part of the battery charging circuit and the battery pack 7a forms part of the driving circuit.
The control center 13a switches between two power generating devices 10a and 10b to supply electrical power to the appropriate battery pack 6a or 7a. The control center 13a also adjusts the ratio of one or both of the gearboxes 14a and 14b and engages or disengages them when needed. As the battery pack 7a is used in the power drive circuit and the battery pack 6a is used in the charging circuit, the non-power battery pack 7a provides sufficient power to charge the battery for subsequently driving the vehicle. When the sensor (not shown) on the battery pack 6a supplying power indicates that its power has been reduced to a preset value, the distribution control center 13a reverses the switches 17b and 17b from the their current positions so that the fully charged battery pack 7a can supply electric power to the motor 1a through the wiring harnesses 19a and 21a and the switch 17b, and these wiring harnesses are part of an electric drive circuit for driving the vehicle. At the same time, the battery pack 6a enters the charging mode from the power generating devices (10a, 10b) via the control center 13a, the switch 17a and the wiring harness 20a′. In one preferred embodiment, the two power generating devices 10a and 10b may have exactly the same structure.
In order to convert the mechanical energy of the free-running wheels of the vehicle into sufficient auxiliary electrical current, a power generating device with high conversion efficiency is the key point among them. It can be mechanically coupled to a free-running wheels of the vehicle through the rotation shaft of the power generating device rotatably coupled to a transmission device connected to the free-running wheels, such as a gearbox set or the like, to convert the rotating mechanical energy of the free-running wheels into electrical energy, and the electric energy generated by the power generating device is stored in the battery pack installed on the electric vehicle through the charging circuit.
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While various embodiments of the present invention have been described above, it should be understood that they have been presented by a way of example and not limitation. Numerous modifications and variations within the scope of the invention are possible. The present invention should only be defined in accordance with the following claims and their equivalents.
