Chassis-Mounted Drive Motor for Electric Vehicle Torque
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Solution Overview
Problem
Conventional hybrid electric and electric vehicles face limitations in drive motor volume due to narrow wheel frame spaces, leading to reduced torque and horsepower, and are prone to vibration damage from road conditions.
Innovation Solution
The drive motor is positioned on a spacious chassis bracket, allowing for increased volume and configuration of the motor body, stator unit, and rotor unit, including larger stator rings and permanent magnetic sheets, to enhance magnetic field effects and torque, while being isolated from wheel vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the drive motor is disposed in the wheel frame, then the structure is compact, but the volume of the motor body is limited and torque and horsepower are reduced
Solution Approach 1:
The drive system is segmented into two independent parts: the drive motor disposed on the chassis bracket and the wheel assembly. This separation allows the motor body volume to be increased without being constrained by the narrow wheel frame space, while the wheel frame maintains its compact structural function.
Solution Approach 2:
The drive motor is relocated from the two-dimensional constrained space of the wheel frame to the three-dimensional spacious environment of the chassis bracket, enabling significant increase in motor body volume, stator ring volume, and permanent magnetic sheets volume.
2Reliability
If the drive motor is disposed in the wheel frame, then the assembly is integrated, but the motor is subject to frequent vibrations and damage from road conditions
Solution Approach 1:
The drive motor is extracted from the wheel frame assembly and disposed independently on the chassis bracket. This extraction removes the motor from the harmful vibration environment caused by road conditions, while the wheel frame continues to perform its function of supporting and rotating the wheels.
Solution Approach 2:
The chassis bracket serves as an intermediary structure that supports the drive motor away from the wheel assembly. This intermediate positioning isolates the motor from the vibrations transmitted through the wheel frame during vehicle operation on rough roads.
3Power
If the lateral wall of the rotor casing has limited area, then the magnet assembly is compact, but the sensing area between magnets and silicon steel sheet is small resulting in reduced output
Solution Approach 1:
The permanent magnetic sheets are disposed at the end surface of the rotor base rather than on the lateral wall, utilizing a different surface area. This dimensional change allows for significantly larger volume and area of permanent magnetic sheets, thereby increasing the sensing area between the magnets and the silicon steel sheet of the stator unit.
Solution Approach 2:
The rotor assembly uses a composite structure with the rotor base having a specific volume and the permanent magnetic sheets disposed at its end surface. This composite configuration allows optimization of both the rotor base volume and the magnetic sheets area to enhance the magnetic field effects and output power.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables significant increases in torque and horsepower, improves energy efficiency, and enhances the endurance of the mobile vehicle by reducing vibration damage and optimizing magnetic field interactions.
Implementation Method 1
when the coils of the stator unit are energized and interact with the plural magnets of the rotor unit, the rotor casing of the rotor unit rotates relative to the stator unit
Implementation Method 2
the sensing area between the plural magnets and the silicon steel sheet is small, resulting in reduced output horsepower and torque
Data Source
AI summary
A mobile vehicle is disclosed herein. It comprises a car body having four wheels and a chassis bracket at a bottom thereof, and at least one drive motor disposed on a front side or a rear side or both of the chassis bracket and each of which has a motor body and a rotational shaft passing through a center of the motor body for driving the four wheels to rotate through a driver assembly.