Alternator Field Current Regulation via Thermal Compensation
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Solution Overview
Problem
Existing alternator systems face inefficiencies and overheating issues due to inadequate heat dissipation, leading to suboptimal operation and component damage, as they often require shutting off the field current at a temperature threshold set below the maximum to account for sensor tolerances and latency, resulting in continuous switching and strain on components.
Innovation Solution
A regulator system that uses thermal compensation logic to adjust the field current modulation based on temperature readings, allowing progressive reduction of the alternator output when temperatures exceed a threshold, enabling continued operation while minimizing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the regulator cuts off the field current at a temperature threshold set below the maximum temperature to account for sensor tolerances and latency, then the components are protected from overheating, but the alternator system cannot operate at optimum capacity and experiences continuous switching
Solution Approach 1:
The patent applies preliminary action by implementing a hysteresis mechanism that anticipates future temperature conditions. When the temperature exceeds the threshold, the regulator doesn't immediately cut off the field current but waits for a predetermined time period to elapse. This preliminary delay allows the system to distinguish between temporary temperature spikes and sustained overheating conditions, enabling the alternator to operate at optimal capacity while still protecting components from damage.
2Temperature
If the regulator continuously switches the field current on and off when the engine runs at high speeds for long periods, then the alternator temperature is controlled, but the operation becomes inefficient and components experience undue stress
Solution Approach 1:
The patent inverts the conventional on-off control approach by implementing a time-delayed response mechanism. Instead of immediately switching off the field current when the temperature threshold is exceeded, the system waits for a predetermined time period to elapse before taking action. This inversion of the immediate response approach eliminates continuous switching during sustained high-temperature operation, reducing energy loss and component stress while maintaining effective temperature control.
3Measurement precision
If the temperature threshold is set significantly below the maximum temperature to account for sensor tolerances and latency, then false positives are reduced, but the alternator system operates inefficiently with reduced capacity
Solution Approach 1:
The patent addresses measurement precision issues by implementing a time-based preliminary action rather than relying solely on temperature threshold margins. The predetermined time period delay allows the system to account for sensor tolerances and latency dynamically, distinguishing between temporary fluctuations and genuine overheating conditions. This approach maintains high alternator output capacity while reducing false positive shutdowns.
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 allows for efficient and safe operation of alternators at higher temperatures by reducing the field current progressively, reducing the need for continuous on-off cycles and minimizing heat-related damage, thereby enhancing operational efficiency and component longevity.
Implementation Method 1
thermal compensation logic arranged to determine whether an indicated temperature exceeds at least a first threshold, and upon determination that the indicated temperature exceeds at least the first threshold, to apply compensation to the reference signal
Implementation Method 2
The magnetic field of the rotor cuts across the conductors, generating an electrical current
Implementation Method 3
the rotor magnetic field is generally created by way of a field winding, which allows control of the alternator-generated current by varying the current in the rotor filed winding
Data Source
AI summary
A regulator system for modulating a field current of an alternator device, comprises logic arranged to receive or generate a reference signal comparison logic arranged to compare a received alternator output indication to the reference signal; and generate a field current modulation signal at least partially based on the comparison of the received alternator output indication and the reference signal. The regulator system further comprises logic arranged to receive at least one temperature indication. The regulator system comprises thermal compensation logic arranged to determine whether an indicated temperature exceeds at least a first threshold, and upon determining that the indicated temperature exceeds at least the first threshold, to apply compensation to the reference signal, the amount by which the reference signal is compensated is at least partly dependant on the amount by which the indicated temperature exceeds the first threshold.