Nio has filed a patent for a coaxial asynchronous motor drive system that aims to reduce parasitic loss and increase the range per charge of battery electric four-wheel-drive vehicles. The system includes a speed reducer, electric motor, main housing, and motor controller, all integrated into a compact design to maximize space utilization. The motor controller controls the gear meshing and torque transfer within the system. GlobalData’s report on Nio gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Nio, HEV energy management was a key innovation area identified from patents. Nio's grant share as of September 2023 was 47%. Grant share is based on the ratio of number of grants to total number of patents.
Coaxial asynchronous motor drive system for electric vehicles
A recently filed patent (Publication Number: US20230302886A1) describes a coaxial asynchronous motor drive system. The system consists of a speed reducer, an electric motor, and a main housing. Additionally, a motor controller is included in the system. The electric motor and speed reducer are connected to form a motor reducer assembly, which is mounted inside the main housing. The motor controller is fixed to the main housing and connected to the motor reducer assembly.
The speed reducer has an input shaft and an output shaft that are in line with each other. A speed reducer input gear is provided on a hollow motor shaft of the electric motor. The motor controller controls the gear on the hollow motor shaft to mesh with an intermediate shaft assembly. This transfers torque to an integral differential, which outputs the torque to two sides. One side is connected to a vehicle axle shaft via a differential axle shaft gear spline, while the other side is connected to a short axle shaft passing through the motor rotor. The short axle shaft is provided with a spline and a retaining ring at the motor exposed end for connection to a vehicle axle shaft internal spline.
The patent also mentions various components and features of the coaxial asynchronous motor drive system. These include the support of the intermediate shaft assembly on a gearbox casing cover and a main housing assembly using intermediate shaft cone bearings. The motor-side short axle shaft is connected to the differential axle shaft gear spline and is rotatably sealed against a high-speed oil seal. It is supported on a motor-side short axle shaft bearing block by a motor-side short axle shaft support bearing.
The main housing of the system is equipped with suspension screw sets, including rear and front suspension screw sets, motor-side front and rear suspension screw sets. These screw sets are used to mount different suspension brackets of the system. The motor controller has a water inlet nozzle located on the main housing, along with a motor water outlet nozzle on the same side.
Other details mentioned in the patent include the exposure of a motor controller-side three-phase copper bar and a motor controller-side temperature and rotary transformer signal and interface from a sealed housing of the motor controller. The motor controller is mounted on the motor reducer assembly using four fixing bolts on a motor rear end cover. The patent also specifies various distance measurements between different components of the system, such as the motor controller and the gearbox-side output end.
Overall, the patent describes a coaxial asynchronous motor drive system with specific configurations and features that aim to improve the performance and functionality of the system.
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