Motor Drive Control Device Advance-Angle Phase Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor drive control devices face challenges in performing accurate advance-angle control, especially under load fluctuations, due to variations in setting current reference values, leading to inefficiencies in motor torque extraction and driving efficiency.
Innovation Solution
A motor drive control device and method that includes a control circuit unit detecting cross-timings between a motor's drive current voltage and multiple reference voltage values, adjusting the phase of the drive current based on these detections, and comparing intervals to determine appropriate phase adjustments, thereby enabling effective advance-angle control irrespective of load fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single current reference value is used for phase adjustment determination, then the control logic is simple, but accurate advance-angle control cannot be performed under load fluctuations
Solution Approach 1:
The patent divides the current reference into multiple segments (first current reference and second current reference) with different thresholds. The control circuit compares the actual current against different reference values based on operating conditions, enabling accurate phase detection across varying load ranges without requiring a single complex adaptive reference system.
Solution Approach 2:
The patent changes the reference parameter (current reference value) based on operating conditions. By switching between different current reference values (first and second references) depending on the detected current magnitude, the system adapts to load fluctuations and maintains accurate phase detection without complex real-time calculation logic.
2Reliability
If the current reference value is set high, then phase adjustment is triggered frequently, but extra current flows worsening driving efficiency
Solution Approach 1:
The patent applies different current reference thresholds for different current ranges. When current is high, a higher reference value is used to prevent unnecessary phase adjustments and extra current flow. When current is low, a lower reference value ensures reliable phase detection. This localized approach to reference selection optimizes both reliability and energy efficiency for each operating condition.
Solution Approach 2:
The patent uses a higher current reference threshold (second reference) that may appear excessive for low-current conditions, but is appropriate for high-current operation. This prevents over-adjustment and extra current flow during normal high-load operation, while the system switches to a more sensitive first reference only when needed for low-current accuracy.
3Measurement precision
If the current reference value is set low, then phase adjustment is triggered accurately, but control becomes insensitive to load variations
Solution Approach 1:
The patent implements a dynamic reference selection mechanism where the control circuit automatically switches between first and second current references based on the detected current magnitude. This dynamic adaptation allows the system to maintain high detection precision across varying load conditions, combining the sensitivity of low thresholds with the robustness of high thresholds as needed.
Solution Approach 2:
The control circuit is designed with multi-functionality to handle different operating conditions using a unified control structure. By incorporating both first and second current references within the same control logic, the system achieves universal applicability across light and heavy load conditions without requiring separate control systems.
4Power
If advance-angle control is not performed, then the control structure is simple, but motor torque extraction is not maximized
Solution Approach 1:
The patent performs preliminary phase adjustment based on current magnitude detection before the motor operates. By pre-determining the appropriate current reference (first or second) based on the detected current level, the system prepares the optimal phase control strategy in advance, maximizing torque extraction without requiring complex real-time calculations during motor operation.
Data Source
AI summary
A motor drive control device includes: a control circuit unit for outputting a drive control signal for performing advance-angle control of a motor to drive the motor; a motor driving unit for outputting a drive signal to the motor with a phase based on the drive control signal output from the control circuit unit to drive the motor; and a current detecting circuit for detecting a voltage value corresponding to a drive current of the motor, wherein the control circuit unit detects a cross-timing between the voltage value detected by the current detecting circuit and each of two or more reference voltage values, and performs the advance-angle control based on a detection result of the cross-timing to adjust a phase of the drive current.