Permanent Magnet Alternator Controller with Segmented Coils
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Permanent magnet generators face challenges in maintaining constant voltage as rotor speed increases, leading to high voltage spikes and inefficiencies due to the need for large, expensive transistors and complex control systems, which are prone to overheating and breakdown.
Innovation Solution
A controller system that connects the power coil and control coil in series, using a three-phase rectifier and transistor switch to control voltage by adjusting current flow through ON/OFF switching, reducing the number of windings and inductance without increasing the winding number, allowing for stable voltage regulation across varying speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of windings in the power coil is increased to control voltage, then voltage regulation capability is improved, but the inductance increases causing larger control current to flow which increases transistor size and cost
Solution Approach 1:
The power coil is divided into multiple independent coils (first power coil, second power coil, third power coil) with different winding numbers. Instead of using one coil with high inductance, the system segments the coil structure to achieve voltage control through selective connection and switching, reducing the required control current.
Solution Approach 2:
The patent dynamically switches between different power coils based on rotor speed and voltage requirements. The controller selects which coil to use (e.g., first coil for high speed, third coil for low speed) to maintain optimal voltage regulation with minimal control current, rather than relying on a single high-inductance coil.
2Measurement precision
If large current is used to control voltage in the power coil, then voltage control precision is improved, but the transistor size and cost increase due to higher current handling requirements
Solution Approach 1:
By segmenting the power coil into multiple coils with different winding numbers, the patent enables precise voltage control through selective coil activation rather than using high control current. Each coil can be optimized for specific voltage ranges, achieving precise control with lower current and smaller transistors.
Solution Approach 2:
The patent changes the inductance parameter by selecting different coils based on operating conditions. Instead of using one high-inductance coil that requires large control current, the system switches between coils with different inductance values to match the required voltage control precision for each operating point.
3Quantity of substance
If the winding number of the power coil is reduced to decrease inductance, then control current is reduced, but voltage regulation capability deteriorates
Solution Approach 1:
The patent segments the power coil into multiple coils with progressively decreasing winding numbers (first coil with highest, second with medium, third with lowest). This segmentation allows the system to use the appropriate coil for each voltage regulation need, maintaining effective voltage control while using lower control current than a single high-inductance coil would require.
Solution Approach 2:
The controller dynamically selects which power coil to activate based on the required voltage regulation precision and operating speed. At low speeds where precise control is needed, coils with higher winding numbers are used; at high speeds, coils with lower winding numbers suffice, optimizing the balance between control current and regulation capability.
4Stability of the object's composition
If phase control converter is used to control voltage, then voltage constant maintenance is improved, but power factor of load is reduced
Solution Approach 1:
The patent uses periodic switching of the power coil connections through the controller, switching between different coils in a periodic manner based on rotor position and speed. This periodic action maintains constant voltage without the need for phase control conversion, thereby preserving the power factor.
Solution Approach 2:
The patent replaces the electrical phase control conversion system with a mechanical switching system that directly controls the power coil connections. This substitution eliminates the need for complex phase control converters and rectifiers, maintaining voltage stability while avoiding the power factor degradation associated with phase control methods.
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 solution reduces the control current significantly, enabling the use of cheaper transistors, lowering system costs, and maintaining stable voltage while preventing voltage spikes, thus improving efficiency and reliability.
Implementation Method 1
a three phase rectifier constituted for changing neutral pointes of power coils and controlling flow of current amount by switching ON/OFF
Implementation Method 2
solenoid coil of power side, solenoid coil of control side
Implementation Method 3
a rotor mounted with a plurality of permanent magnet members on an periphery side for rotation in a stator housing
Data Source
AI summary
Solenoid coils not interlinked by magnet flux of a rotor, increase inductance of a control coil system for controlling generated voltage using little current flow to a switch so no increase in windings of a power coil is needed. A generator with rotor having magnets and stator outside the rotor, have winding coil of the stator connected in series to solenoid coil. A power terminal is between the power and control sides of the solenoid coil and a switch controls flow of current from the power coil to the solenoid coil. By controlling ON/OFF condition of the switch disposed on the DC terminal of a rectifier connected to the solenoid coil in series, the generated voltage is controlled to a voltage set in advance, in response to a detection signal from a sensor detecting the voltage.