Inductive Load Drive Control for Resonance Suppression
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Solution Overview
Problem
Existing load drive control devices for inductive loads face challenges in preventing resonance when the natural vibration frequency changes due to external factors, particularly in applications like hydraulic valves, where the use of a stroke sensor is expensive and impractical.
Innovation Solution
A load drive control device that includes a switching section, pulse signal generating section, actual current value detection, feedback setting, drive frequency setting, detection setting, and selection section, which allows for dynamic adjustment of drive frequency and duty ratio to prevent resonance without relying on a stroke sensor by using the inductive load itself for natural vibration frequency detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stroke sensor is used to detect natural vibration frequency and switch drive frequency to prevent resonance, then resonance suppression is achieved, but device cost and complexity increase significantly
Solution Approach 1:
The inductive load itself serves as the detection sensor by utilizing its own current characteristics to detect natural vibration frequency. The control device monitors the current waveform of the inductive load directly, eliminating the need for external stroke sensors while enabling resonance detection and frequency switching functionality.
Solution Approach 2:
The current detection functionality serves dual purposes: it monitors the operational state of the inductive load for control purposes and simultaneously detects natural vibration frequency for resonance prevention. This multi-functionality eliminates the need for separate detection hardware.
2Reliability
If a stroke sensor is used to detect natural vibration frequency and switch drive frequency to prevent resonance, then resonance suppression is achieved, but manufacturing cost increases
Solution Approach 1:
The inductive load serves its own detection function by providing current waveform information that reveals natural vibration frequency. This self-service approach eliminates expensive external sensors and reduces manufacturing costs while maintaining resonance suppression capability.
Solution Approach 2:
The patent replaces expensive, complex stroke sensors with simple, low-cost current detection circuitry that is already present in the control system. This substitution dramatically reduces component costs and simplifies manufacturing.
3Reliability
If drive frequency is set in advance to prevent resonance, then resonance can be avoided under fixed conditions, but the system cannot adapt when natural vibration frequency changes due to external factors
Solution Approach 1:
The control device continuously monitors the current waveform of the inductive load to detect natural vibration frequency in real-time. Based on this feedback, the system dynamically adjusts the drive frequency to maintain resonance-free operation even when external conditions change, replacing fixed frequency settings with adaptive frequency control.
Solution Approach 2:
The system transitions from static, pre-set drive frequency to dynamic frequency adjustment. The drive frequency is continuously adapted based on real-time detection of natural vibration frequency, allowing the system to respond to changing operational conditions and maintain optimal performance.
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 suppresses resonance in inductive loads by dynamically adjusting the drive frequency based on detected natural vibration frequency, even when external factors like temperature changes the viscosity of oil, without the need for an expensive stroke sensor, thus simplifying the device configuration and improving operational stability.
Implementation Method 1
A pulse signal generating section drives an inductive load by generating pulse signals with a duty ratio at a drive frequency
Implementation Method 2
An actual current value detection section detects an actual current value of the inductive load
Implementation Method 3
In the inductive load driven at the predetermined drive frequency, resonance is generated when the drive frequency coincides substantially with a natural vibration frequency of the inductive load, or is substantially equal to the integral multiple of the natural vibration frequency
Data Source
AI summary
A load drive control device is provided, which includes a pulse generator for generating pulse signals with a duty ratio to drive an inductive load, a feedback setting section for setting the duty ratio for feedback, a detection setting section for setting the duty ratio for detection of a natural vibration frequency of the inductive load, a natural vibration frequency setting section for setting the natural vibration frequency of the inductive load based on an actual current value detected at setting the duty ratio for detection, and a selection section for selecting the feedback setting section as a duty ratio setting section at a normal time and for selecting the detection setting section as the duty ratio setting section when a condition for detecting the natural vibration frequency is satisfied.