BLDC Motor Advance Angle Control via Anti-Windup
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Solution Overview
Problem
Existing automatic advance angle control systems for brushless linear direct current (BLDC) motors rely on lookup tables and additional circuits, which are inefficient and costly, especially in high-speed operations, and fail to accurately adjust for changes in operating temperature.
Innovation Solution
An automatic advance angle control system that generates an advance angle using an anti-windup output minus the voltage headroom, independently of their magnitude relationship, without relying on lookup tables or additional circuits, by employing a current controller, voltage headroom calculator, and advance angle controller to compensate for accumulated errors and adjust the phase current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lookup table or additional circuit connected to hall sensor is used for advance angle control, then advance angle control can be implemented, but volume and cost of the entire motor system increase
Solution Approach 1:
The patent extracts the advance angle control function from external components (lookup tables and additional circuits) and implements it within the existing current controller using the anti-windup output signal. This eliminates the need for separate advance angle control hardware while maintaining the control functionality, thereby reducing system volume and cost without sacrificing control accuracy
Solution Approach 2:
The patent makes the existing anti-windup output signal serve dual purposes: both its original function for current control and a new function for generating the advance angle signal. By reusing the anti-windup output from the current controller, the system achieves multi-functionality without adding dedicated components, thus reducing overall device complexity
2Reliability
If lookup table is used for advance angle control, then advance angle can be controlled, but accurate knowledge of rated output, rated rotational speed and maximum rotational speed is required
Solution Approach 1:
The patent enables the current controller to automatically generate the advance angle signal using its own internal anti-windup output signal. This self-service approach eliminates the need for external lookup tables and precise motor parameter knowledge, as the controller adapts to operating conditions automatically through the anti-windup mechanism, thereby simplifying the control system
Solution Approach 2:
The patent utilizes the anti-windup output signal, which inherently contains feedback information about the motor's operating state and accumulated errors. This feedback mechanism allows the system to dynamically adjust the advance angle based on actual performance without requiring pre-programmed lookup tables or complex parameter measurements
Data Source
AI summary
Provided are an automatic advance angle control system and method for a brushless linear direct current (BLDC) motor. The automatic advance angle control system for the BLDC motor includes a current controller configured to generate an anti-windup output for compensating for accumulated errors of an output voltage provided to the BLDC motor; a voltage headroom calculator configured to generate a voltage headroom from a counter-electromotive force and the output voltage provided to the BLDC motor; and an advance angle controller configured to generate an advance angle for controlling a phase of a phase current of the BLDC motor by performing proportional integration on a difference between the anti-windup output and the voltage headroom when the anti-windup output is generated and configured to ignore the generation of the advance angle when the anti-windup output is not generated.