Variable Torque Motor for Electric Tricycles
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Solution Overview
Problem
Existing motors for electric tricycles lack variable torque and speed functionality, leading to inefficient operation under varying loads, resulting in reduced service life, stability issues, and increased heating risks.
Innovation Solution
An automatically variable torque and speed motor with a motor rotor assembly featuring staggered pole pieces and a cylindrical spiral compression spring mechanism that adjusts speed and torque based on load conditions, ensuring efficient operation by enhancing revolving speed at low loads and increasing torque at high loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the motor operates with a single function and fixed torque-speed characteristics, then the structure is simple, but the motor efficiency decreases under varying load conditions
Solution Approach 1:
The patent implements a dynamic torque adjustment mechanism where the motor torque can be automatically adjusted based on load conditions through a torque adjustment mechanism comprising a torque adjustment motor, gear transmission, and spring-loaded pressing assembly. This allows the motor to transition from fixed to variable torque operation, optimizing efficiency across different load scenarios while maintaining reasonable structural complexity.
2Force
If the motor increases output power to handle large loads, then the output torque increases, but the revolving speed declines and overheating occurs
Solution Approach 1:
The patent changes the operational parameters of the motor by implementing variable torque control. The torque adjustment mechanism modifies the torque parameter dynamically based on load detection, allowing the motor to maintain optimal speed-torque operating points rather than relying on fixed high-power operation that causes speed decline and overheating.
3Device complexity
If the motor operates at low speed during idle running, then the structure is simple, but the running efficiency decreases and travel time increases
Solution Approach 1:
The patent incorporates a feedback control system where load detection sensors monitor the actual load conditions and provide feedback to the control unit. The control unit then adjusts the torque through the torque adjustment mechanism, enabling the motor to operate at optimal speeds for different load conditions, thereby improving running efficiency during idle travel while maintaining manageable system complexity.
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
The motor operates in a high-efficiency range, reduces motor current and temperature, enhances safety and stability, and prolongs service life by adapting to load changes without power increase, making it more energy-efficient and environmentally friendly.
Implementation Method 1
an elastic compression part is arranged in the inner cavity of the revolving support ring along the revolving direction, and the elastic compression part has one end arranged at the inner circle of the revolving support ring, and the other end arranged on the side wall, facing the inner cavity of the revolving support ring, of one of the fixed side discs
Implementation Method 2
staggered pole pieces are arranged in the same manner around the circumferential surface of the support of the fixed rotor and around the circumferential surface of the support of the rotary rotor; the staggered pole pieces include a plurality of N poles and S poles which are circumferentially arranged in an alternative way in turn on the excircle of each one of the supports
Data Source
AI summary
An automatically variable torque and speed motor for electrical tricycles is disclosed, and the motor rotor assembly of which comprises fixed rotors and rotary rotors arranged adjacently in turn along the axis of the motor shaft. Staggered pole pieces on the surfaces of the fixed rotor and the rotary rotor form a staggered angle α along the circumference. The support of the rotary rotor comprises a revolving support ring and two fixed side discs which are respectively arranged on the two sides of the revolving support ring. An elastic compression part is arranged in the inner cavity of the revolving support ring along the revolving direction. The elastic compression part has one end arranged at the inner circle of the revolving support ring and the other end arranged on the side wall, facing the inner cavity of the revolving support ring, of one of the fixed side discs. The present invention can adjust the speed and torque according to the load situations of the whole electrical tricycle. It can run in a highly efficient range in the case of low load, and automatically increases the output torque in the case of high load. The power output of the motor of the electrical tricycle is more reasonable, and the reliability of key parts and components of the electrical tricycles is enhanced, and the service life of the whole electrical tricycles is prolonged; and the whole electrical tricycle becomes more energy-saving and environmentally-friendly.