Linear Motor Control Device Using Variable Proportional Gain
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Solution Overview
Problem
Linear motors face instability when operating under conditions with sliding resistance, which can hinder movement and increase operation time due to suppressed thrust.
Innovation Solution
A control device with a current limiter and driver that adjusts voltage based on proportional gains to manage current values, switching between target and limit current command values to stabilize motor operation, even with sliding resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the thrust generated by the linear motor is reduced to minimize force applied to the work, then the force applied to the work is reduced, but the movement of the head portion may be hindered by sliding resistance causing instability
Solution Approach 1:
The control device dynamically adjusts the proportional gain based on the operating state (normal state vs. state where current is limited by sliding resistance). When sliding resistance is detected to be hindering movement, the system switches to a second proportional gain that is greater than the first, enabling the motor to overcome the resistance and maintain stable operation while still controlling the thrust applied to the work.
Solution Approach 2:
The system changes the control parameter (proportional gain) based on the operating conditions. By switching between two different proportional gains, the system adapts to different resistance conditions, allowing stable operation both when sliding resistance is present and when it is not, while maintaining control over the thrust applied to the work.
2Force
If the thrust generated by the linear motor is reduced to minimize force applied to the work, then the force applied to the work is reduced, but the operation time increases due to hindered movement
Solution Approach 1:
The control device dynamically adjusts the proportional gain based on the operating state. When sliding resistance is detected to be hindering movement, the system switches to a second proportional gain that is greater than the first, enabling the motor to overcome the resistance and maintain stable operation while still controlling the thrust applied to the work.
Solution Approach 2:
The system changes the control parameter (proportional gain) based on the operating conditions. By switching between two different proportional gains, the system adapts to different resistance conditions, allowing stable operation both when sliding resistance is present and when it is not, while maintaining control over the thrust applied to the work.
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
Enables stable operation of linear motors by managing thrust and sliding resistance, preventing movement inhibition and reducing operation time.
Implementation Method 1
a driver configured to apply a voltage to the linear motor on the basis of a value obtained by multiplying a difference between a current value of a current flowing through the linear motor and the current command value by a first proportional gain
Data Source
AI summary
A control device for a linear motor is disclosed which is provided with a current limiter and a driver. The current limiter outputs either a target current value or a limiting current command value. When the target current value is output as the current command value, the driver applies a voltage to the linear motor based of the value obtained by multiplying a first proportional gain by the difference between the current value of the current flowing to the linear motor and the current command value. When the limiting current command value is output as the current command value, the driver applies a voltage to the linear motor based of the value obtained by multiplying a second proportional gain, which is greater than the first proportional gain, by the difference between the current value of the current flowing to the linear motor and the limiting current command value.