An electric vehicle wheel hub motor drive device and its implementation method

Abstract

A hub motor drive device for electric vehicle Including hub, Spindle, front cover, Rear end cap, rotor, Stator and stator support, the stator bracket comprises a shaft sleeve, Center brace and windingstator mount, and the sleeve, A median stay plate and a winding stator seat are integrally for, and the shaft sleeve is fixedly sleeved on the main shaft, A cop ring is arranged on the side surface of the winding stator seat, and a closed aluminum frame ring is mounted on one side surface of the copper ring, the shaft body of the main shaft between the rear end cover and the shaft sleeve is sleeved with an auxiliary stator seat, The position of the sub-stator base relative to the closed aluminum frame ring is provided with a sub-winding, a driving control unit is arranged between the sub-stator base and the central stay plate, and the inner ring of the rear end cover is provided with an inner concave plate, which increases the torque density and the adjustable width of the hub motor, andsimultaneously provides good unsprung mass damping of the motor.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to an electric vehicle wheel hub motor drive device and an implementation method. Background technique [0002] The in-wheel motor technology is also called the in-wheel motor technology. Its biggest feature is that it integrates the power device, transmission device and braking device into the wheel hub, which greatly simplifies the mechanical parts of the electric vehicle. The in-wheel motor drive system is based on The rotor type of the motor is mainly divided into two structural types: inner rotor type and outer rotor type. The outer rotor type adopts a low-speed outer rotor motor without deceleration device. The speed of the wheel is the same as that of the motor, while the inner rotor type uses a high-speed inner rotor motor. , equipped with a reducer with a fixed transmission ratio, in order to obtain higher power density, since the in-wheel motor has the characteristics of i...

AI Technical Summary

Problems solved by technology

[0003] However, the structure of the in-wheel driving device of the inner rotor-shaped hub motor of the existing electric vehicle hub motor is complex, and the torque density of the hub motor is low under the consideration of the self-weight of the electric vehicle and the limitation of the hub space of the outer rotor motor. The difference in running roads makes electric vehicles in different sports modes, so the initial torque distribution and speed regulation width range of the in-wheel motor is small, and the power that can be maintained in the initial torque working area is low, so that the drive structure of the in-wheel motor is affected. In addition, during the movement of the hub motor, the ground impact will be directly transmitted to the rotor of the motor, and the unsprung mass will be reduced, which will make the magnetic gap width of the motor constantly change and affect the output of the motor torque

[0004] For example, the technical solution provided by an electric hub driving device with application number CN201710179921.6 includes a main support shaft, a built-in motor mounted on the main support shaft, and a planetary reduction mechanism. The planetary reduction mechanism includes a sun gear and a planetary gear set , the planetary carrier and the center wheel fixed to the main support shaft along the circumferential direction, the planetary gear set and the planetary carrier located in the wheel make the hub motor drive, and the drive control unit needs to allocate a large torque density to drive the hub motor. At the same time, the planetary gear set at the front end cover of the hub, during the movement of the hub motor, the impact received by the tire will be directly transmitted to the gears in the planetary gear set, thereby affecting the rotation of the hub motor and increasing the power consumption of the hub motor drive electricity

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