Air Conditioner DC Motor Control for Simultaneous Origin Detection
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Solution Overview
Problem
The existing control units for air conditioners using two DC motors driven by three half-bridge circuits face challenges in independently controlling the motors, leading to longer detection times for the origin position pattern, which affects the efficiency of air outlet switching operations.
Innovation Solution
A control unit configuration where each DC motor is connected between two half-bridge circuits, allowing for simultaneous detection of the origin position pattern by rotating in one direction and reversing when reaching the end of the detectable range, ensuring neither motor is prioritized during detection, thus minimizing the maximum required time for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two DC motors are driven by three half-bridge circuits with one motor prioritized during detection, then the prioritized motor can be operated preferentially to avoid user discomfort, but the non-prioritized motor requires a longer detection time
Solution Approach 1:
The patent dynamically adjusts the detection strategy based on real-time motor states. When one motor is rotating during detection, the other motor waits until the first motor stops before changing direction, rather than following a fixed priority scheme. This dynamic adaptation allows the system to optimize detection time while maintaining user comfort.
Solution Approach 2:
The control unit continuously monitors the rotational state of both motors and uses this feedback to determine when to change detection direction. The detection process is adjusted based on feedback from motor rotation status, enabling the system to minimize maximum detection time without compromising user experience.
2Productivity
If the DC motor rotates in one direction within detectable range and stops upon detection, then detection efficiency is improved, but when reaching end of range without detection, the motor must reverse direction which increases detection time
Solution Approach 1:
The control unit performs preliminary checks to determine whether the other motor is rotating before changing detection direction. This preliminary action prevents unnecessary waiting time and allows the detection process to proceed more efficiently by anticipating the optimal moment to reverse direction.
Solution Approach 2:
The detection process is made dynamic by conditionally changing direction based on the real-time rotational state of the other motor. Rather than following a predetermined sequence, the system adapts its detection strategy to minimize the maximum detection time while maintaining efficiency.
Data Source
AI summary
A control unit controls a first DC motor and a second DC motor by detecting a rotational position thereof and includes first control means and second control means. The first control means performs a detection of the origin position pattern by controlling each DC motor to rotate toward one side within a detectable range. In case where the rotational position reaches one end of the detectable range, the second control means performs a detection of the origin position pattern by controlling the DC motor to rotate oppositely from the one side when the other DC motor is stopping, and performs a detection of the origin position pattern by controlling the DC motor to rotate oppositely from the one side after the rotational position of the other DC motor reaches the one end of the detectable range when the other DC motor is rotating.