Powder Feeding Device Current Control for Flow Stability
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Solution Overview
Problem
Conventional powdery material feeding devices face challenges in accurately maintaining a desired flow rate during feedback control halts, due to errors in rotational speed and torque corrections caused by load impacts on measuring instruments, leading to deviations in actual discharge flow rates.
Innovation Solution
A powdery material feeding device that includes a hopper, a transfer member, a motor, and a controller, where the controller maintains a substantially constant current to the motor's coil, adjusting rotational speed to ensure a consistent discharge flow rate, even during feedback control halts, by correlating current and flow rate to achieve the target discharge amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control is halted temporarily while the hopper is supplied with powdery material, then the measuring instrument is protected from load impact errors, but the discharge flow rate cannot be definitely kept at the target flow rate
Solution Approach 1:
The patent introduces current amount as an intermediary parameter to bridge the gap between motor drive and discharge flow rate control. Instead of directly controlling flow rate during feedback halt, the system controls motor current to maintain rotational speed, which indirectly maintains the discharge flow rate at target value even when direct flow rate measurement is suspended
Solution Approach 2:
The patent implements a dual feedback mechanism: primary feedback controls motor current based on measured discharge flow rate, and secondary feedback adjusts rotational speed when current deviates from constant value during feedback halt. This ensures the discharge flow rate returns to target value after feedback control resumes
2Reliability
If the rotational speed of the motor is kept at the value just before the halt of feedback control, then the discharge flow rate is intended to be maintained, but the flow rate deviates from the target flow rate
Solution Approach 1:
The patent changes the control parameter from direct rotational speed control to current amount control during feedback halt. By controlling motor current to maintain constant value, the system indirectly maintains rotational speed and discharge flow rate, achieving better precision than direct speed control alone
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for accurate control of the discharged powdery material flow rate to a desired value, ensuring consistent delivery even when feedback control is temporarily halted, thereby maintaining precise control over the discharge process.
Implementation Method 1
a motor configured to drive the transfer member; a controller configured to control, while a control according to a discharge amount of the powdery material measured by the measuring instrument is not conducted, a current supplied to a coil of the motor
Data Source
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AI summary
A powdery material feeding device (B1, B2, B3) includes a hopper (B01) configured to reserve a powdery material, a transfer member (B021) configured to deliver discharge the powdery material fed from the hopper (B01) for discharging, a motor (B022) configured to drive the transfer member (B021), a measuring instrument (B04) configured to measure a discharge amount of a powdery material delivered to be discharged by the transfer member (B021), and a controller (B05) configured to control, while a control according to a discharge amount of the powdery material measured by the measuring instrument (B04) is not conducted, a current supplied to a coil of the motor (B022) to have a substantially constant amount, to control the discharge amount of the powdery material delivered to be discharged by the transfer member (B021) to have a required amount.