Vehicle Motor Control System Dynamic Coil Configuration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electric vehicle motors face challenges in designing the number of turns in their coils to simultaneously optimize performance for both low-speed and high-speed running, as the counter electromotive force exceeds battery voltage at high speeds when designed for low-speed efficiency, leading to increased copper loss and decreased efficiency at high speeds.
Innovation Solution
A vehicle motor control system that measures motor speed and accelerator pedal pressure to dynamically change the number of coil-winding turns by altering the connection mode between the motor and inverter, adjusting from series to parallel configurations based on speed and torque requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the number of turns in the coil is increased to generate high counter electromotive force for low-speed running, then low-speed torque performance is improved, but counter electromotive force exceeds battery voltage during high-speed running, causing efficiency to decrease
Solution Approach 1:
The patent applies the dynamics principle by making the coil connection mode changeable during motor operation. The control unit dynamically switches between series connection (for high counter electromotive force at low speed) and parallel connection (for lower counter electromotive force at high speed), allowing the motor to adapt to different operating conditions and resolve the contradiction between low-speed torque and high-speed efficiency
Solution Approach 2:
The patent applies parameter changes by altering the electrical connection configuration (series to parallel) of the coil windings based on motor speed and torque requirements. This changes the effective number of turns and resistance, thereby adjusting the counter electromotive force and current characteristics to optimize performance across different speed ranges
2Use of energy by moving object
If the number of turns in the coil is decreased to achieve high-speed running optimization, then counter electromotive force remains below battery voltage, but high electric current is required for high torque, increasing copper loss and decreasing efficiency
Solution Approach 1:
The control unit dynamically switches the coil connection mode from parallel to series when high torque is required at high speed, effectively increasing the number of turns and reducing current draw, thereby maintaining high efficiency while meeting torque demands and reducing copper loss
3Force
If the coil design is fixed for low-speed efficiency, then low-speed torque is optimized, but the design cannot satisfy high-speed performance requirements
Solution Approach 1:
The patent makes the coil connection mode dynamic and changeable during operation, allowing the motor to switch between series and parallel configurations based on real-time speed and torque requirements, thereby achieving both low-speed and high-speed performance optimization with a single motor design
Solution Approach 2:
The motor design achieves multi-functionality by using the same coil windings in different connection modes (series and parallel) to serve different performance requirements, making the motor adaptable to both low-speed high-torque and high-speed low-torque operating conditions
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 approach enhances motor efficiency by increasing series turns for low-speed high-torque scenarios and parallel turns for high-speed low-torque scenarios, maintaining performance across speed ranges while reducing copper loss and optimizing efficiency.
Implementation Method 1
the counter electromotive force is expressed as the product of a magnetic flux linkage of a coil of a vehicle motor and a rotational speed of a rotor of the vehicle motor
Data Source
AI summary
A vehicle motor control system and method. The vehicle motor control system includes a measurement unit configured to measure a motor speed of a vehicle and a pressure applied to an accelerator pedal, a determination unit configured to compare the measured motor speed with a predetermined reference speed to determine whether the vehicle is running at low or high speed and compare the pressure applied to the accelerator pedal with a predetermined reference pressure to determine whether the pressure applied to the accelerator pedal is greater than or equal to the predetermined reference pressure, and a control unit configured to control a change in the number of coil-winding turns by changing a connection mode between the motor and an inverter according to a result of the determination of the determination unit.