Motor Drive Circuit Advance Angle Control
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Solution Overview
Problem
Conventional motor drive circuits face challenges in accurately controlling motor rotation speed over a wide range while maintaining high efficiency, particularly in reducing noise, and require complex switching circuits for precise advance angle control.
Innovation Solution
A motor drive circuit with an advance angle setting correcting device that automatically adjusts the advance angle based on a detection signal proportional to the motor's rotation speed, eliminating the need for a target rotation speed controlling device and simplifying the circuit configuration, allowing for variable speed control and optimized motor efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional advance angle control with predetermined values is used, then the control circuit is simple, but the motor efficiency cannot be optimized across wide rotation speed range
Solution Approach 1:
The patent implements dynamic advance angle control by automatically adjusting the advance angle value based on the detected motor rotation speed. The control circuit transitions from static predetermined values to dynamic speed-dependent adjustment, enabling optimal motor efficiency across a wide rotation speed range without requiring complex external switching circuits.
Solution Approach 2:
The patent employs feedback mechanisms by detecting the actual motor rotation speed and using this information to automatically adjust the advance angle value. The rotation speed detection result feeds back to the control circuit, which then selects or calculates the appropriate advance angle, creating a closed-loop control system that optimizes motor performance adaptively.
2Measurement precision
If multiple predetermined advance angle values are switched using external signals, then the control precision improves, but the device complexity and cost increase
Solution Approach 1:
The patent enables the control circuit to self-adjust the advance angle value based on its own detection of motor rotation speed. The system serves itself by using internally detected speed information to automatically select or calculate the appropriate advance angle, eliminating the need for external switching signals and complex external circuitry while maintaining precise control.
Solution Approach 2:
The control circuit is designed to perform multiple functions: it detects rotation speed, determines the appropriate advance angle value, and outputs control signals. This multi-functional integration allows the circuit to achieve precise advance angle control across different speed ranges without requiring separate external switching circuits for each function.
3Measurement precision
If target rotation speed controlling device is added, then the speed control accuracy improves, but the circuit complexity increases
Solution Approach 1:
The patent merges the rotation speed detection function and advance angle control function into a single integrated control circuit. By combining these functions, the system achieves accurate speed control without requiring separate target speed controlling devices, thereby maintaining control accuracy while minimizing circuit complexity.
Data Source
AI summary
A motor drive circuit includes: an advance angle setting correcting device having a correction reference cycle according to a reference advance angle count value, in which a correction amount is calculated as a ratio of the correction reference cycle to a cycle of a detection signal indicating a detected frequency proportional to a motor rotation speed, and in which an advance angle setting signal is obtained by multiplying the correction amount by a proportionality factor; and an advance angle setting device in which the advance angle correction value is added to the reference advance angle count value thereby outputting an advance angle setting signal, wherein a drive command signal containing a rotation speed information based on a target rotation speed is externally fed, the motor rotation speed is variably controlled in response to the drive command signal, and the detection signal is fed from a rotation speed detecting device.