Machine Tool Servo Control Optimizing Total Power Consumption
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Solution Overview
Problem
Existing control devices for machine tools struggle to optimally reduce total power consumption during machining, as extending acceleration time to reduce current consumption increases cycle time, thereby increasing power consumption of constant power equipment like oil pumps.
Innovation Solution
A control device that calculates and optimizes the target time constant for the feed axis driving motor based on the summation of power consumption of the motor and constant power equipment, allowing for precise control of acceleration and deceleration times to minimize total power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If acceleration time of the servomotor is extended to reduce maximum current, then power consumption of the servomotor is reduced, but cycle time increases and power consumption of constant power equipment increases
Solution Approach 1:
The system dynamically adjusts the acceleration time parameter based on the workpiece weight. For heavier workpieces, longer acceleration times are permitted to reduce motor current, while for lighter workpieces, shorter acceleration times are used to maintain productivity. This parameter adaptation resolves the contradiction by making the acceleration time flexible rather than fixed.
Solution Approach 2:
The control system dynamically determines the acceleration time constant based on real-time conditions (workpiece weight detection) rather than using a static value. This dynamic adjustment allows the system to optimize the balance between motor power consumption and cycle time according to actual machining conditions.
2Use of energy by moving object
If acceleration time is extended to reduce motor current, then motor power consumption decreases, but total power consumption increases due to longer operation of constant power equipment
Solution Approach 1:
The system changes the acceleration time parameter based on workpiece weight, allowing optimal balance between motor power consumption and constant power equipment consumption. For heavy workpieces, the extended acceleration time is necessary to reduce motor current, and the system accepts the corresponding increase in total power consumption. For light workpieces, shorter acceleration times reduce both motor and constant power equipment consumption.
Solution Approach 2:
The control system dynamically optimizes the acceleration time constant to minimize total power consumption by considering both motor power consumption and constant power equipment consumption. The system calculates the optimal acceleration time based on the detected workpiece weight and controls the servomotor accordingly, achieving dynamic energy optimization.
Data Source
AI summary
A control device for a machine tool including a feed axis driving motor; a first power consumption calculating portion calculating power consumption of the feed axis driving motor; a second power consumption calculating portion calculating power consumption of equipment adapted to be operated by constant power; and a motor control portion determining a target time constant correlated with at least one of acceleration time and deceleration time of the feed axis driving motor, based on a summation of the power consumption calculated by the first power consumption calculating portion and the power consumption calculated by the second power consumption calculating portion, and controlling the feed axis driving motor based on the target time constant.