Passive Flux Control for Permanent Magnet Generator Voltage Stability
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Solution Overview
Problem
Active magnetic flux control systems for permanent magnet generators are expensive to create and calibrate, making them cost-prohibitive for applications requiring steady output voltage, such as consumer and military vehicles.
Innovation Solution
A passive magnetic flux control system using a passive rectifier and a passive control element connected to the magnetic flux control windings, which creates a feedback loop to stabilize output voltage by adjusting magnetic coupling based on rotor speed and load changes, eliminating the need for an active controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an active magnetic flux control system is used to maintain steady output voltage, then voltage stability is improved, but system cost and complexity increase
Solution Approach 1:
The passive control element automatically adjusts the magnetic flux in the control windings based on the output voltage level without requiring external control signals. The element uses the generator's own output voltage to drive the control current, creating a self-regulating system that maintains steady output voltage without complex active controllers
Solution Approach 2:
The passive control element is connected in a feedback loop where the output voltage is converted to control current that adjusts the magnetic flux in the control windings. This feedback mechanism automatically responds to voltage changes and adjusts the magnetic coupling between the rotor and stator to maintain stable output voltage
2Stability of the object's composition
If an active magnetic flux control system is used to maintain steady output voltage, then voltage stability is improved, but manufacturing and calibration costs increase
Solution Approach 1:
The invention replaces expensive active controllers with a simple passive control element that has no moving parts, no processors, and no calibration requirements. The passive element consists of basic electrical components that are inexpensive to manufacture and do not require complex calibration procedures, significantly reducing system cost
Solution Approach 2:
The invention extracts the control function from the expensive active controller and implements it through a simple passive control element. By removing the need for processors, sensors, and active regulation circuitry, the system achieves voltage stability at a fraction of the cost of active control systems
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 passive control system effectively maintains a stable output voltage without the high costs associated with active controllers, making it suitable for cost-sensitive applications like consumer and military vehicles.
Implementation Method 1
a portion of the output voltage is converted into a current and the current is used to create a magnetic flux within the permanent generator
Implementation Method 2
When a current travels through the control windings, a magnetic flux is created which permeates the adjacent generator windings. The flux permeation magnetically decouples the generator windings from the rotor.
Data Source
AI summary
A permanent magnet generator assembly has a permanent magnet generator with magnetic flux control windings, a passive rectifier, and a passive control element. The passive control element electrically connects an output of the passive rectifier to the magnetic flux control windings.