Motor Drive Controller Advance Lag Angle Adjustment
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Solution Overview
Problem
Existing motor drive controllers are costly due to the need for high-processing-power microcomputers to adjust modulation rates for each frequency of PWM signals, which is required to suppress vibrations caused by resonance in motors like axial fan motors across all speeds.
Innovation Solution
A motor drive controller that includes a rotational position detector and a controller that outputs driving control signals to repeatedly adjust the advance and lag angles at energization switching in a prescribed pattern, reducing the need for high-cost microcomputers by transforming electromagnetic vibration components to avoid resonance with the natural frequency of the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If modulation rates of the inverter are adjusted for each frequency of PWM signals to suppress vibration resonance, then vibration and noise are reduced, but the device complexity and cost increase due to requiring high-processing-power microcomputers
Solution Approach 1:
The patent extracts only the essential control function needed to suppress vibration (advance angle and lag angle adjustment) from the complex PWM modulation rate adjustment system. By separating the vibration suppression function from the overall control system, it achieves effective vibration reduction without requiring high-processing-power microcomputers for comprehensive frequency adjustment.
Solution Approach 2:
The patent replaces expensive high-performance microcomputers with simpler, lower-cost control devices. The invention uses basic angle adjustment mechanisms that can be implemented with inexpensive hardware, making vibration suppression accessible without requiring costly processing power.
2Object-affected harmful factors
If modulation rates are adjusted for each frequency to prevent resonance across all speeds, then vibration peaks are suppressed at all speeds, but the ease of manufacture decreases due to higher cost components
Solution Approach 1:
The patent changes the control parameters from complex modulation rates to simple advance angle and lag angle adjustments. This parameter transformation allows vibration suppression to be achieved through basic angle modifications rather than complex frequency modulation, significantly reducing component costs while maintaining effectiveness across all speeds.
3Object-affected harmful factors
If a microcomputer with decent processing power is used to adjust modulation rates for each frequency, then vibration resonance is prevented, but the loss of substance increases due to higher cost
Solution Approach 1:
The patent extracts the essential vibration suppression function from the complex frequency adjustment system, implementing only the necessary angle adjustment mechanism. This extraction eliminates the need for expensive high-processing-power microcomputers while maintaining resonance prevention capability.
Solution Approach 2:
The patent replaces costly microcomputers with inexpensive control hardware that performs only the essential angle adjustment function. This substitution achieves resonance prevention without the financial burden of high-performance processing components.
Data Source
AI summary
A motor drive controller includes: a motor driver that applies a voltage to each phase of a motor to rotate; a rotational position detector that detects rotational position of the motor and generates rotational position information indicating the rotational position; and a controller that outputs, to the motor driver, driving control signals for repeatedly adjusting an advance angle and a lag angle at energization switching of the each phase of the motor in a prescribed pattern based on the rotational position information generated by the rotational position detector.