Stepper Motor Torque Control for Low-Noise Analysis Devices
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Solution Overview
Problem
Conventional analysis devices with stepping motors experience increased vibration and noise due to excessive driving torque used to prevent step-out, and existing countermeasures like reducing rotational speed to increase torque further degrade device performance.
Innovation Solution
An analysis device with a stepping motor, a drive unit, a control unit, and a detection unit that increases the driving torque stepwise each time step-out is detected, allowing the torque to reach an upper limit before notifying the user and adjusting the driving current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving torque is increased to prevent step-out, then reliability is improved, but vibration and noise increase
Solution Approach 1:
The patent applies dynamics by making the driving torque adjustable rather than fixed. The control unit dynamically changes the driving torque based on operational conditions, allowing the system to use higher torque only when necessary to prevent step-out, while using lower torque during normal operation to reduce vibration and noise.
Solution Approach 2:
The patent changes the parameter of driving torque from a constant high value to a variable value that adapts to operational needs. By adjusting the driving torque parameter based on detection unit feedback and operational stage, the system achieves reliable step-out prevention while minimizing harmful vibrations and noise during normal operation.
2Reliability
If rotational speed is decreased to increase driving torque, then step-out is prevented, but device performance deteriorates
Solution Approach 1:
The patent uses dynamics to adjust driving torque independently of rotational speed changes. Instead of reducing speed to increase torque, the control unit directly modifies the driving torque parameter, allowing the motor to maintain optimal rotational speed for performance while achieving the necessary torque for step-out prevention.
Solution Approach 2:
The patent changes the driving torque parameter without necessarily changing the rotational speed parameter. This decoupling allows the system to prevent step-out through torque adjustment while maintaining the rotational speed required for optimal device performance and productivity.
3Reliability
If driving torque is set significantly greater than minimum required, then step-out prevention is improved, but energy consumption increases
Solution Approach 1:
The patent applies dynamics by making driving torque adaptive rather than constantly high. The control unit adjusts torque levels based on real-time feedback from the detection unit and operational stage, ensuring high torque is applied only when needed for step-out prevention, thereby reducing unnecessary energy consumption during normal operation.
Solution Approach 2:
The patent optimizes energy consumption by dynamically changing the driving torque parameter to match actual operational requirements. Instead of maintaining a constantly high torque setting, the system adjusts torque levels, consuming significant energy only when step-out risk is detected, while using minimal energy during stable operation.
Data Source
AI summary
Provided is an analysis device capable of reducing vibration and noise generated by a stepping motor due to countermeasure for step-out of the stepping motor. A drive unit is controlled such that a set value of driving torque of the stepping motor increases stepwise in a plurality of steps each time the step-out of the stepping motor is detected by the step-out detection unit.