Cascade MOSFET Gear Switching for Variable-Torque Motor Efficiency
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Solution Overview
Problem
Conventional electric generators and motors are inefficient when operating outside their rated rotational speed and torque conditions, leading to significant efficiency drops in applications with variable power sources, such as renewable energy technologies and hybrid vehicles.
Innovation Solution
A Variable Torque Generation (VTG) system that dynamically adjusts the magnetic field and wiring configurations of electric machines using a cascade MosFet switch design and tunable Halbach magnet arrays, allowing for efficient operation over a wide range of torque and RPM conditions, and incorporates a cooling system to manage temperature and increase amperage capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional electric generators and motors operate outside their rated rotational speed and torque conditions, then adaptability to variable power sources is improved, but efficiency deteriorates dramatically
Solution Approach 1:
The patent implements dynamic reconfiguration of the electric machine by switching between different wiring configurations (series, parallel, series-parallel) and adjusting magnetic field strength through controllable magnets. This allows the machine to adapt its electrical and magnetic characteristics in real-time to match varying operational conditions, maintaining high efficiency across a wide range of torque and RPM conditions rather than being fixed at rated conditions
Solution Approach 2:
The system changes key operating parameters including wiring configuration (affecting current distribution), magnetic field strength (through controllable magnet arrays), and operational mode (motor/generator switching). These parameter changes enable the machine to optimize its performance for different load conditions, power source characteristics, and speed requirements, resolving the contradiction between adaptability and efficiency
2Speed
If Variable Frequency Drives are used to operate electric motors above and below rated RPM, then speed range is improved, but performance and efficiency deteriorate
Solution Approach 1:
Rather than using conventional variable frequency drives that reduce efficiency at non-rated speeds, the patent dynamically reconfigures the internal wiring and magnetic fields of the electric machine itself. This allows the machine to maintain its optimal electrical characteristics across a wide speed range, achieving both extended RPM capability and sustained high efficiency without relying on external frequency conversion equipment
3Ease of manufacture
If permanent magnets are used in linear motors to simplify construction, then ease of manufacture is improved, but efficiency range deteriorates due to back EMF and drag
Solution Approach 1:
The patent employs controllable or adjustable magnets that can modify their magnetic field strength based on operational conditions. This allows the system to reduce magnetic field intensity during coasting or low-power phases, minimizing back EMF and eddy current losses while maintaining the simplified permanent magnet construction. The magnetic parameter is dynamically adjusted rather than fixed, resolving the efficiency limitation
Solution Approach 2:
The system employs periodic or pulsed magnetic field activation rather than continuous magnetic fields. During coasting phases or when power delivery is not required, the magnetic fields are reduced or deactivated periodically, eliminating the continuous drag force that plagues conventional permanent magnet linear motors while maintaining simplicity of construction
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 VTG system achieves high efficiency and power increase by seamlessly switching between different wiring configurations and magnetic field adjustments, maintaining optimal performance across varying torque and RPM conditions, and significantly reduces energy losses due to overheating.
Implementation Method 1
The rotary force causes an electric current to be generated in one or more wire windings through interaction between magnetic fields created by magnets within the generator and the wire windings
Implementation Method 2
tunable Halbach magnet arrays
Implementation Method 3
incorporates a cooling system to manage temperature and increase amperage capacity
Implementation Method 4
Cascade MosFet switch design
Data Source
AI summary
A cascade MosFet circuit design for variable gear switching using pulse width modulation (PWM) between electronic gears to achieve a smooth transition is disclosed. In an embodiment, in the system, there can be three separate stages of two or more switches from very low amperage to hundreds of amps that can be automatically selected within a chosen stage. The automatic switching can be programmed to be power (e.g., current) sensitive or can be both power and electronic gear sensitive as to cascade into the right MosFet combination for different gear settings and still select greater values for varying power levels. Such a smooth transition can allow the generator or motor using such cascade MosFet circuit design to operate more efficiently and/or more quietly.