Resonant Motor System for High-Speed Engine Assistance
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Solution Overview
Problem
Conventional assist motors in commercial cars face challenges in increasing rotary torque at low speeds due to size constraints and limited rotational speed, especially when integrated with turbo systems to reduce fuel consumption.
Innovation Solution
A resonant motor system incorporating a resonant circuit with magnetic coils and capacitors, a regenerating portion, motor driving portion, motor control portion, and a bidirectional converter to increase DC link voltage, allowing the resonant motor to be driven by stored electric power and enhance engine assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the rotational speed of the assist motor is increased to more than 25000 rpm to reduce motor size and increase power density, then the motor size is reduced and power is increased, but the conventional inverter cannot achieve this due to its output frequency limit of about 250 Hz and maximum rotational speed of about 2500 rpm at switching time
Solution Approach 1:
The patent replaces the conventional inverter's mechanical switching system with a resonant circuit system that uses electrical resonance to achieve high-frequency operation. The resonant motor uses capacitors connected in parallel with magnetic coils to create a resonant circuit, eliminating the need for complex mechanical switches and enabling rotational speeds exceeding 25000 rpm.
Solution Approach 2:
The patent changes the operating parameters of the motor system by introducing resonance frequency operation. By tuning the resonant frequency of the capacitor-coil circuit to match the motor's back-EMF frequency, the system achieves efficient high-speed operation. The switching frequency is synchronized with the resonant frequency, allowing the motor to operate at speeds much higher than conventional inverters can achieve.
2Volume of moving object
If the assist motor is positioned in a limited space near the engine to provide torque assistance, then the motor can assist engine startup, but the motor size must be reduced which limits power output
Solution Approach 1:
The patent changes the fundamental operating parameters of the motor by using resonant frequency control. This allows a compact motor to produce high power output through resonant amplification of the magnetic field, achieving over 25000 rpm and high torque density in a limited space near the engine.
Solution Approach 2:
The patent employs periodic resonant oscillations in the magnetic field to amplify the motor's power output. By operating at the resonant frequency where the inductive reactance of the coils equals the capacitive reactance of the capacitors, the system achieves maximum power transfer and torque generation from a compact motor structure.
3Use of energy by moving object
If conventional turbo systems are used to reduce fuel consumption and exhaust gas, then fuel efficiency is improved, but engine rotary torque is lowered at low speeds
Solution Approach 1:
The patent applies preliminary action by using the resonant motor to provide torque assistance during engine startup and low-speed operation, before the turbo system can effectively build up exhaust pressure. The resonant motor compensates for the torque deficiency at low speeds, allowing the turbo to spin up faster and reach optimal operating range more quickly, thereby maintaining both low fuel consumption and adequate torque.
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 resonant motor system achieves higher rotational speeds, reduces motor size, increases efficiency, and decreases the number of transistors and capacitors required, enabling faster engine startup and improved torque delivery.
Implementation Method 1
a resonant motor having a resonant circuit including magnetic coils and capacitors, for generating an electric power when the resonant motor is rotated by an engine
Implementation Method 2
a capacitor portion for storing therein the electric power generated by the resonant motor when the resonant motor is regenerated
Implementation Method 3
a bidirectional converter having two transistors connected in series with each other, inserted between the capacitor portion and the motor driving portion, and a control portion for the bidirectional converter, and is characterized in that a DC link voltage applied on the motor driving portion from the capacitor portion is increased by conducting the two transistors in opposite directions to each other
Data Source
AI summary
A resonant motor system having a resonant circuit that includes magnetic coils and of capacitors, for generating an electric power when the resonant lot is rotated by an engine, a regenerating portion for the resonant motor, a motor driving portion, a motor control portion, and a capacitor portion for storing therein the electric power generated by the resonant motor when the resonant motor is regenerated, the resonant rotor being driven by the electric power stored in the capacitor portion when the engine is assisted by the resonant motor.