Hub electric system, electromobile and driving, braking and stroke-increasing method thereof

Abstract

The invention discloses a hub electric system and an electromobile. The hub electric system comprises a hub, a speed reducing / torque changing device, a power source modulator, a driving operation and control device and at least an electric device, each electric device comprises a coaxial swivel, at least one stator unit and at least one permanent magnet rotor unit, the rotor units are arranged on the corresponding swivels, and relative air gaps between the stator units and the rotor units are not greater than 70 mm; the coaxial swivels and the hub are arranged coaxially, electromagnetic poles of the stator units are opposite to magnetic poles, which move to face the stator units, of the rotor units, the power source modulator acquires a user' instruction through the driving operation and control device / an electromagnetic braking device and correspondingly outputs time sequence current to drive / brake the hub electric system. The electromobile comprises a frame, a battery pack and at least one wheel. At least one hub electric system is arranged, and a stroke increasing system supplements power for a secondary battery pack when in a set logic state.

Description

technical field [0001] The invention relates to the field of electric vehicle and its power source design, in particular to a structure of an in-wheel electric system, a driving and braking method thereof, and a range-extending method of an electric vehicle including the in-wheel electric system. Background technique [0002] At present, electric vehicles on the market are mainly two-wheeled vehicles. The market share of electric two-wheeled vehicles in my country has reached more than 150 million; in addition to two-wheeled vehicles, electric tricycles have also risen rapidly in recent years. According to industry information, in 2013, the number exceeded 10 million. The low-speed electric four-wheel vehicle market for regional use has also achieved considerable development. [0003] At present, electric vehicle motors are developing from general-purpose to professional design, and their power controllers are also trying to use pulse modulation technology to reduce the react...

AI Technical Summary

Problems solved by technology

[0004] In the electric vehicle market, in recent years, counterparts at home and abroad have tried to develop electric wheels with electric mechanisms installed on the rim, but they have not achieved the expected success. For electric bicycles, the shaft output power of the motor is transmitted through gears. Due to the use of traditionally designed motors and conventional power supply methods, its power conversion efficiency is similar to that of hub-type motors, and setting the motor on the outer edge of the rim will be limited by power

In the electric four-wheel vehicle market, the current mainstream idea of ​​developing high-power wheel-hub motors is to install the motor inside the wheel hub. Because the weight / volume ratio of conventional motors is low, the weight of the wheel hub increases greatly, and the practical power consumption index is not high. Low, and the cost performance is not high, and there are fewer types of products in the market

[0005] Short mileage is the weakness of electric vehicles at this stage. The industry generally believes that before high-energy batteries enter commercial use, it is unrealistic to increase the mileage of electric vehicles by increasing the number of batteries. Therefore, the current mainstream of the automobile market is to develop a dual-source hybrid of oil and electricity. The design concept of the car is: when the car starts or at low speed, the power of the electric motor is used, and when the car reaches a certain speed threshold, it is converted to use the power of the internal combustion engine, thereby reducing the power caused by the incomplete combustion of the internal combustion engine when the car starts or at low speed. Exhaust pollution; its technical basic structure is characterized by: the fuel tank provides fuel output power to the internal combustion engine system; on the basis of this traditional design, a set of electric motor system electrically connected to the battery pack is added in parallel, and the electric motor is provided by the battery pack to provide electric energy output power; two The road power transmits the power of the internal combustion engine or electric motor to the wheel hub through the oil and electric power conversion device sharing the mechanical transmission system. This kind of dual-source power design can be called an oil and electric power parallel system, and its obvious disadvantage is high manufacturing cost.

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