Alternator Ripple Voltage Detection for Starter Motor Protection
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Solution Overview
Problem
Existing motor systems face challenges in accurately detecting motor operation to prevent starter motor activation, which can lead to damage, and current methods either require costly sensors or suffer from false negatives due to voltage drops caused by electrical loads.
Innovation Solution
A system incorporating a ripple voltage detector module that monitors the alternator's output voltage and detects ripple voltage to provide a motor operation signal to the starter motor control system, ensuring the starter motor remains inactive even during voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage threshold monitoring is used to detect motor operation, then the system can prevent starter motor activation, but electrical loads cause voltage drops that lead to false negatives and incorrect starter motor activation
Solution Approach 1:
The patent changes the detection parameter from absolute voltage level to voltage ripple characteristics. Instead of monitoring whether voltage exceeds a fixed threshold, the system detects the presence of voltage ripple (AC component) superimposed on the DC voltage from the alternator. This parameter transformation allows reliable motor operation detection even when average voltage drops due to electrical loads, as the ripple signature remains present during motor operation.
2Reliability
If sensors are added to detect rotating parts for accurate motor operation detection, then detection reliability improves, but system cost and complexity increase
Solution Approach 1:
The patent applies the self-service principle by using the alternator's own electrical output characteristics to detect motor operation. The alternator naturally produces voltage ripple when driven by the operating motor, and this inherent electrical signature is used for detection without requiring external sensors. The system essentially uses the alternator to detect motor operation through its own electrical behavior, eliminating the need for separate detection devices.
Solution Approach 2:
The patent replaces mechanical detection methods (such as sensors detecting rotating crankshafts or camshafts) with electrical field-based detection. Instead of using mechanical or electromagnetic sensors to physically detect rotating components, the system uses electrical ripple voltage analysis from the alternator output. This substitution of mechanical detection with electrical signal analysis simplifies the system while maintaining detection reliability.
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
Effectively prevents starter motor activation during motor operation, reducing the risk of damage and eliminating the need for additional sensors, thereby enhancing system reliability and reducing maintenance costs.
Implementation Method 1
a ripple voltage detector unit, an input operatively connected to the ripple voltage detector unit and connectable to an alternator, and an output operatively connected to the ripple voltage detector unit and connectable to a starter motor control system. The ripple voltage detector module provides a motor operation signal to the starter motor control system upon detection of a ripple voltage produced by the alternator.
Data Source
AI summary
A system for detecting operation of a motor includes a ripple voltage detector module including a ripple voltage detector unit, an input operatively connected to the ripple voltage detector unit and connectable to an alternator, and an output operatively connected to the ripple voltage detector unit and connectable to a starter motor control system. The ripple voltage detector module provides a motor operation signal to the starter motor control system upon detection of a ripple voltage produced by the alternator.