Dual Dynamotor CVT Module for Shift-Free EV Torque and Speed Control

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Solution Overview

Problem

Conventional electric vehicles with single-speed or multi-speed transmissions face limitations in providing adequate torque for climbing and high speed on flat ground, and experience power interruptions during gear shifting, leading to poor comfort.

Innovation Solution

A dynamotor module with DC terminal voltage, comprising two dynamotors connected in parallel with independent external excitation generators, allowing for adjustable rotation speeds and magnetic flux densities to regulate torque and speed ratios, eliminating the need for gear shifting and providing Continuously Variable Transmission (CVT).

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single-speed transmission is used, then the device complexity is reduced, but the adaptability to different driving conditions (climbing and high speed) deteriorates

Engineering Contradiction:

Improvetransmission structureVSAvoidtorque and speed adaptability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent employs two dynamotors with independently controllable speeds and magnetic flux densities, enabling dynamic adjustment of the output speed ratio. This dynamic control allows the transmission system to adapt to different driving conditions without mechanical gear shifting, resolving the contradiction between simple structure and high adaptability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operating parameters (rotation speeds and magnetic flux densities) of the two dynamotors to achieve continuous variation of the speed ratio. By adjusting these parameters, the transmission can provide different torque and speed outputs for climbing and high-speed driving, maintaining adaptability while avoiding complex mechanical structures.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If multi-speed transmission is used, then the adaptability to different driving conditions is improved, but power interruption occurs during gear shifting

Engineering Contradiction:

Improvetorque and speed adaptabilityVSAvoidpower continuity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent uses two dynamotors operating simultaneously with independently controllable speeds. The output of the first dynamotor drives the second dynamotor, creating a continuous power transmission path without mechanical gear engagement. This eliminates power interruption during speed ratio changes, ensuring continuous and smooth power delivery to the wheels.

Inventive Principle:

Principle #20Continuity of useful action

3Adaptability or versatility

If multi-speed transmission is used, then the torque and speed adaptability is improved, but the device complexity increases

Engineering Contradiction:

Improvetorque and speed adaptabilityVSAvoidtransmission structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent replaces the traditional mechanical gear shifting system with an electromagnetic control system. Two dynamotors with independently controllable magnetic flux densities and rotation speeds substitute for mechanical gears, achieving continuous variable transmission through electromagnetic fields rather than mechanical engagement, thus reducing structural complexity while maintaining adaptability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 dynamotor module with DC terminal voltage enhances torque and speed flexibility, reducing power interruptions and improving vehicle comfort by allowing continuous adjustment of torque and speed ratios without gear shifting, thus addressing the limitations of conventional transmissions.

Implementation Method 1

the first effective magnetic flux density B1 is provided by a first external excitation generator, and the second effective magnetic flux density B2 is provided by a second external excitation generator

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a first dynamotor with DC terminal voltage having a first rotation speed S1 and a first effective magnetic flux density B1; and a second dynamotor with DC terminal voltage having a second rotation speed S2 and a second effective magnetic flux density B2

Methodology Applied

Scientific EffectElectromagnetic conversion: Electromagnetic Induction

Data Source

PatentUS20230302920A1Dynamotor module with DC terminal voltage, transmission comprising the same and vehicle comprising the same

Publication Date: 2023.09.28 CHANG CHUN JONG

AI summary

The invention discloses a dynamotor module with DC terminal voltage, comprising a first dynamotor with DC terminal voltage and a second dynamotor with DC terminal voltage, wherein the first and the second dynamotor with DC terminal voltage are connected in parallel with a DC common terminal voltage Va, and the first dynamotor with DC terminal voltage has a first rotation speed Si and a first effective magnetic flux density B1, the second dynamotor with DC terminal voltage has a second rotation speed S2 and a second effective magnetic flux density B2, wherein when the first dynamotor with DC terminal voltage and the second dynamotor with DC terminal voltage are operated at a steady state, the first rotation speed Si and the second rotation speed S2 are not equal to zero, and the first effective magnetic flux density Bland the second effective magnetic flux density B2 are not equal to zero, and the absolute ratio of |S1|/|S2| is directly proportional to B2/B1.