Permanent-magnetic electric device, electric vehicle and driving, braking and range-extending methods thereof

Abstract

The invention discloses a permanent-magnetic electric device and an electric vehicle. The electric device comprises a power modulator, a driving control device, a fixed body and a rotating body. The rotating body is an annular mechanical ring with a rotating shaft, and at least four permanent-magnetic rotor units with the magnetic poles in the same direction are arranged on the rotating body at intervals. The fixed body is a mechanical disc with a fixed shaft, at least one stator unit is arranged on the fixed body, and the periodic relative air gap between the stator unit and the rotor units is not greater than 40mm. The electromagnetic pole direction of the stator unit is opposite to the direction of the magnetic pole, moving to the stator unit, of each rotor unit. The power modulator acquires an instruction of a user through the driving control device / an electromagnetic brake device and correspondingly outputs a sequence current to drive / brake the electric device. The electric vehicle comprises a vehicle frame, a battery pack and at least one wheel, and is equipped with at least one set of the electric device. A range extending system supplements power for a secondary battery pack in a set logic state.

Description

technical field [0001] The invention relates to the field of electric vehicle and its power supply power design, in particular to a mechanical design of an electric device, a sequential current design method for driving and braking, and a range-extending method for the electric vehicle. Background technique [0002] At present, the electric bicycle market is usually equipped with a motor installed on the wheel shaft. The motor is designed as an outer rotor. The outer rotor is mechanically connected to the rim of the wheel through the spokes, and the wheel is rotated by the torque of the motor. The hot spot in the electric vehicle industry is the development of passenger wheel hub motors, also known as wheel built-in motors. Industry experts generally believe that because the weight of the current hub motor components far exceeds the hub body (generally including hub motors, brake discs, brake calipers, and active suspension motors) , suspension, damping spring, etc.), its te...

AI Technical Summary

Problems solved by technology

PWQ technology is generally used in control. The main problem of this kind of permanent magnet brushless DC motor is the approximation control of sine wave deformation. Although its power supply is modulated by PWQ technology, the control method is limited by the traditional internal motor. design

[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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