Exhaust-Powered Motor Control for High-Speed Vehicle Drive
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Solution Overview
Problem
Existing vehicle drive systems face a challenge in increasing engine speed while maintaining energy efficiency, as back electromotive force generated at high speeds increases rotational resistance, leading to reduced engine speed and energy inefficiency due to the need for battery power to counteract this force.
Innovation Solution
A drive system that includes a motor with stator coils and permanent magnets, a generator using engine exhaust to generate electric power, and a control unit that supplies this generated power to the motor when certain conditions are met, reducing magnetic flux density and thus rotational resistance without relying solely on battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electric power is supplied from a battery to electromagnets in the motor to generate magnetic flux opposite to the magnet's magnetic field, then rotational resistance is reduced and engine speed can increase, but energy efficiency of the vehicle is reduced
Solution Approach 1:
The patent combines the generator and motor into an integrated system where the generator uses engine exhaust to generate electric power that is then supplied to the motor's electromagnets. This merging allows the system to reduce rotational resistance and increase engine speed while maintaining energy efficiency by using waste exhaust energy instead of drawing power from the battery.
Solution Approach 2:
The patent converts the harmful waste exhaust from the engine into a beneficial resource by using it to drive the generator, which produces electric power to counteract the back electromotive force in the motor. This transforms an energy loss into a useful function that improves engine speed while preserving overall energy efficiency.
2Speed
If the motor operates at high speed, then vehicle performance is improved, but back electromotive force increases causing rotational resistance that prevents further engine speed increase
Solution Approach 1:
The patent applies preliminary anti-action by using the generator to produce electric power that is supplied to the motor's electromagnets before the back electromotive force becomes excessive. This generates a magnetic flux that opposes the magnet's magnetic field, counteracting the rotational resistance caused by back electromotive force and enabling the engine to achieve higher speeds.
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 effectively suppresses rotational resistance and improves energy efficiency by using generated power from the engine exhaust to counteract back electromotive force, allowing for increased engine speed without accelerating battery power consumption.
Implementation Method 1
a generator (8) that generates electric power by using exhaust of the engine
Implementation Method 2
a motor (4) that includes stator coils (41a to 41c) and a rotor (42) having permanent magnets
Implementation Method 3
a motor (4) that includes stator coils (41a to 41c) and a rotor (42) having permanent magnets
Data Source
AI summary
A drive system including a motor that includes stator coils and a rotor having permanent magnets, a battery that supplies electric power to the stator coils of the motor, an engine that rotates a drive shaft connected to the rotor to generate a driving force of a vehicle, a generator that generates electric power by using exhaust of the engine, and a control part that controls a power source of the electric power to be supplied to the stator coils, wherein the electric power generated by the generator is supplied to the stator coils when an operating state of the engine satisfies a predetermined condition.