Motor Control Circuit Advance Angle Correction
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Solution Overview
Problem
Conventional motor control circuits face inefficiencies due to small variations in motor rotation number caused by load changes, leading to printing distortions and reduced drive efficiency, and require complex switching circuits for precise control.
Innovation Solution
A motor control circuit that automatically sets an appropriate advance angle value by comparing the period of a detection signal proportional to the motor speed with a reference signal, using a proportional coefficient to calculate a correction value and adjust the advance angle, eliminating the need for external switching signals and complex circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the advance angle value is switched by external signals to optimize drive efficiency at different speeds, then drive efficiency is improved, but device complexity increases due to complex switching circuits requiring many resistors, switching elements, and external interfaces
Solution Approach 1:
The motor control circuit automatically determines and switches advance angle values based on detected motor speed without external control signals. The circuit self-regulates by comparing detected speed with stored speed thresholds and autonomously selecting appropriate advance angle values from memory, eliminating the need for external switching signals and complex interface circuits.
Solution Approach 2:
The patent replaces complex external switching circuits with a simplified internal digital control system. Instead of using external resistors, switching elements, and interfaces to control advance angle selection, the system uses a microprocessor or microcontroller that reads speed detection signals and programmatically selects advance angle values from memory, substituting hardware switching with software-based control.
2Measurement precision
If the number of advance angle values is increased for more precise control, then control precision is improved, but device complexity increases due to complex switching circuits requiring more components
Solution Approach 1:
The system dynamically adjusts the advance angle value based on the detected motor speed. The microprocessor continuously monitors speed and automatically selects from multiple pre-stored advance angle values corresponding to different speed ranges, enabling precise control across the entire operating range without requiring complex external switching circuitry for each individual value.
Solution Approach 2:
The single microprocessor-based control unit performs multiple functions: it detects motor speed, compares speed with stored thresholds, determines the appropriate advance angle value, and outputs control signals. This universal controller replaces what would otherwise require multiple dedicated switching circuits, one for each advance angle selection, thereby achieving high control precision with simplified hardware.
Data Source
AI summary
To provide a motor control circuit that variably controls the speed of a motor, in which an appropriate advance angle value corresponding to the speed of the motor that is set can be automatically set. The motor control circuit according to the present invention includes an advance angle setting means that adds a reference advance angle value to an advance angle correction value obtained by multiplying a proportional coefficient by a correction amount and outputs an advance angle setting signal, and an advance angle setting correction means that uses a ratio of a correction reference period relative to a period of a reference signal input from the outside as a correction amount and corrects the reference advance angle value by an advance angle correction value obtained by multiplying the correction amount by a predetermined proportional coefficient of the advance angle setting means.