Motor Driving Controller Resonance Vibration Control
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Solution Overview
Problem
Existing motor driving controllers require high-processing-capability microcomputers to adjust modulation ratios at every PWM signal frequency, leading to increased costs and inefficiencies in preventing resonance vibrations across all rotation speeds, particularly in applications like axial fan motors where a fixed vibration peak is necessary.
Innovation Solution
A motor driving controller configuration that includes a rotary position detection circuit, a control part, and a motor driver, which alternates overlap energization operations in a predetermined pattern to manage power supply current components and reduce resonance at natural frequencies within specific rotation speed ranges, using a microcomputer that is not necessarily high-capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If modulation ratio adjustment at every PWM frequency is implemented to prevent resonance, then resonance vibrations are effectively suppressed, but microcomputer processing capability requirements increase and costs rise
Solution Approach 1:
The patent extracts and addresses only the specific resonant frequency components that cause harmful vibrations, rather than adjusting modulation ratios across all PWM frequencies. By identifying and targeting only the problematic resonant frequencies, the solution reduces processing requirements while maintaining effectiveness in suppressing resonance vibrations.
Solution Approach 2:
The patent changes the modulation ratio parameter selectively at specific PWM frequencies corresponding to resonant frequencies, rather than continuously adjusting across all frequencies. This selective parameter change reduces the computational burden on the microcomputer while still achieving effective resonance suppression.
2Object-affected harmful factors
If resonance avoidance is implemented for all rotation speeds with a fixed vibration peak requirement, then vibration control is achieved across the full speed range, but the control method becomes troublesome and complex
Solution Approach 1:
The patent segments the rotation speed range into regions where resonant frequencies occur and applies control only in those specific segments. Rather than implementing continuous control across all speeds, the solution divides the operating range and targets only the problematic segments, simplifying the overall control method.
Solution Approach 2:
The patent applies partial action by implementing modulation ratio adjustment only at specific frequencies where resonance occurs, rather than applying control measures across the entire frequency spectrum. This partial approach is sufficient to control vibration peaks while reducing operational complexity.
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 configuration effectively reduces electromagnetic vibrations by transferring power supply current components to non-resonant frequencies, thereby avoiding resonance and maintaining cost-effectiveness while ensuring vibration control across all rotation speeds.
Implementation Method 1
In a general motor driven by switching energization to a coil, an electromagnetic vibration component by energization switching is one of main factors
Implementation Method 2
a rotary position detection circuit detecting a rotary position of a rotor and generating rotary position information
Data Source
AI summary
A motor driving controller comprising a motor driver applying voltage to each phase of a motor and driving the motor, a rotary position detection circuit detecting a rotary position of a rotor and generating rotary position information, and a control part outputting, to the motor driver, a driving control signal to execute control based on the detected rotary position information, so that an overlap energization operation at a time of energization switching is repeated in a predetermined pattern.