Motor Drive Control Device Pseudo Sine Wave Generation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor drive control systems are complex and difficult to modify, especially when generating and changing pseudo sine wave excitation waveform patterns for motor control, which complicates noise reduction and adaptability to motor drive states.
Innovation Solution
A motor drive control device comprising a PWM circuit, measurement circuit, arithmetic circuit, and setting circuit that calculates and adjusts the duty of the excitation current to generate a pseudo sine wave pattern by dividing a 2-phase excitation waveform into micro-step components, allowing for easy generation and adaptation of the waveform based on motor drive states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a digital PLL is used to generate pseudo sine wave excitation waveform from 2-phase excitation, then the excitation waveform can be generated, but the system becomes complicated
Solution Approach 1:
The patent extracts only the necessary functional elements from a full sine wave generation system. Instead of using a complete digital PLL circuit, it extracts the essential timing control function and implements it through simple duty ratio measurement and comparison logic, achieving pseudo sine wave generation with minimal system complexity
Solution Approach 2:
The patent changes the control parameter from phase angle (used in digital PLL) to duty ratio. By measuring the duty ratio of the 2-phase excitation waveform and comparing it with reference values, the system generates pseudo sine wave excitation for micro-step control without requiring complex phase locking mechanisms
2Ease of operation
If the excitation waveform pattern is fixed, then the control is simple, but it cannot adapt to different motor drive states
Solution Approach 1:
The patent implements dynamic adaptation by continuously measuring the duty ratio of the current motor drive state and dynamically selecting or adjusting the excitation waveform pattern accordingly. The control device can switch between different excitation patterns (2-phase, micro-step, etc.) based on real-time duty ratio measurements, providing both simplicity and adaptability
Solution Approach 2:
The system uses feedback from duty ratio measurement to automatically adjust the excitation waveform. By measuring the actual duty ratio and comparing it with reference values, the control device can determine the appropriate excitation pattern and make real-time adjustments without complex external intervention
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
Simplifies the generation and modification of pseudo sine wave excitation waveform patterns, reducing noise and improving adaptability to motor drive states, thereby enhancing motor control efficiency and stability.
Implementation Method 1
a measurement circuit configured to measure a charge duty of the excitation current
Implementation Method 2
a PWM circuit configured to generate an excitation current for a motor
Implementation Method 3
an arithmetic circuit configured to obtain a characteristic line from the change of the measured duty and calculates a predetermined division point of an excitation current waveform from the characteristic line
Data Source
AI summary
A motor drive control device includes a PWM circuit configured to generate an excitation current for a motor, a measurement circuit configured to measure a charge duty of the excitation current, an arithmetic circuit configured to obtain a characteristic line from the change of the measured duty and calculate a predetermined division point of an excitation current waveform from the characteristic line, and a setting circuit configured to set a level of the excitation current at the division point.