Multi-Motor Drive Synthesis Box for Torque-Speed Balance
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Solution Overview
Problem
Existing electric vehicles with large loads face challenges in ensuring high torque and maximum speed while maintaining low manufacturing costs and reliability, often resulting in poor power performance at medium or high speeds and frequent gear shifts that reduce comfort and increase system costs.
Innovation Solution
A drive box with multiple driving motors of small torques and high rotational speed, combined with a differential and reduction gear assemblies, allows cooperative or independent operation, reducing the need for complex multi-gear transmissions and enhancing reliability by enabling continued operation even if one motor fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a single large torque motor with slow rotational speed is used, then large torque requirement is met, but power performance at medium or high speed deteriorates
Solution Approach 1:
The patent divides the single motor function into multiple motors (first motor and second motor). Each motor operates independently or cooperatively to provide different torque-speed characteristics. The first motor with large torque and slow speed handles low-speed high-torque requirements, while the second motor with small torque and high speed handles medium-high speed power performance, resolving the contradiction between torque and speed performance.
2Speed
If multi-gear automated mechanical transmission is used, then power performance at medium or high speed is improved, but system cost and complexity increase
Solution Approach 1:
Instead of using a complex multi-gear transmission system, the patent segments the power delivery function across multiple motors with different characteristics. This eliminates the need for complex gear shifting mechanisms while maintaining good power performance across different speed ranges.
Solution Approach 2:
The patent replaces the mechanical gear transmission system with an electrically controlled multi-motor system. The motor controllers adjust the output of each motor based on speed and torque requirements, substituting mechanical gear shifting with electronic control to reduce complexity.
3Speed
If frequent gear shifts are performed, then power performance is maintained, but driving comfort deteriorates due to power interruptions
Solution Approach 1:
The patent ensures continuous power delivery by having multiple motors that can operate simultaneously or independently. When one motor reaches its speed limit, the other motor can take over or supplement, eliminating the power interruptions that occur during gear shifts in traditional systems and maintaining smooth continuous operation.
4Ease of manufacture
If a single motor is used, then system cost is reduced, but reliability deteriorates when the motor fails
Solution Approach 1:
The patent divides the power delivery function into multiple independent motors. If one motor fails, the other motor can continue to operate, providing backup functionality and maintaining system reliability. This segmentation creates redundancy without requiring an overly complex system design.
Solution Approach 2:
The patent uses motors with different torque and speed parameters (first motor: large torque, slow speed; second motor: small torque, high speed). This parameter differentiation allows each motor to operate in its optimal range while providing functional redundancy, improving reliability without significantly increasing cost.
Data Source
AI summary
Disclosed are a drive synthesis box with multi-motors flexible torque and an electric vehicle. The drive synthesis box with multi-motors flexible torque includes at least two power sources and at least two reduction gear assemblies. Each power source includes driving motors for outputting driving force. The at least two reduction gear assemblies are connected to the at least two power sources in one-to-one correspondence, for transmitting the driving force.