Decompression Pump Torque Limit Control During Space Opening
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Solution Overview
Problem
Existing decompression systems face inefficiencies when transitioning between closed and open states with respect to a secondary-side space, leading to deviations in motor operation and reduced process efficiency.
Innovation Solution
A decompression system with a control device that includes a torque command generation unit, limiter, power conversion unit, and a limit changing unit to manage torque commands, limit values, and temporarily adjust limits in response to space transitions, ensuring motor operation aligns with operation commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the torque command is limited to a fixed limit value to prevent motor overload, then motor reliability is improved, but motor operation deviation increases during space transitions
Solution Approach 1:
The limiter dynamically adjusts the limit value based on the operational state of the decompression system. When the primary-side space transitions from closed to open state, the limiter increases the limit value temporarily to accommodate the sudden load change, then returns to the normal limit value. This dynamic adjustment prevents motor overload while minimizing operation deviation during transitions.
Solution Approach 2:
The system changes the parameter (limit value) of the torque command based on the detected state of the decompression system. The control device detects when the primary-side space is opened and accordingly modifies the limit value parameter, increasing it during the transition period and then restoring it to normal. This parameter change allows the motor to handle transient loads without excessive deviation.
2Ease of operation
If the limit value is increased temporarily during space transitions, then motor operation deviation is suppressed, but device complexity increases
Solution Approach 1:
The control device incorporates a feedback mechanism that detects the operational state of the decompression system (closed or open state of primary-side space). Based on this feedback, the limiter automatically adjusts the limit value of the torque command. This feedback-based control suppresses motor operation deviation during transitions without requiring complex external control systems.
Solution Approach 2:
The limiter within the control device performs self-adjustment based on the detected state of the decompression system. When the system detects a transition to open state, the limiter automatically increases the limit value and then restores it, without requiring external intervention or complex control logic. This self-service approach minimizes device complexity while maintaining operational accuracy.
Data Source
AI summary
A decompression system includes: an electric pump configured to decompress a primary-side space with respect to a secondary-side space; and a control device configured to control a motor of the electric pump, wherein the control device includes: a torque command generation unit configured to generate a torque command to operate the motor in accordance with an operation command; a limiter configured to limit the torque command to a limit value or less; a power conversion circuit configured to generate driving power corresponding to the torque command passed through the limiter and supply the driving power to the motor; and a limit changing unit configured to temporarily increase the limit value in response to opening of the decompressed primary-side space with respect to the secondary-side space.