Reducer-Mounted Temperature Sensing for Accurate Arm Control
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Solution Overview
Problem
Conventional drive devices with a reducer between the motor and the arm face challenges in accurately detecting temperature changes of the arm using a temperature sensor attached to the motor.
Innovation Solution
A controller that utilizes a sensor mounted on the reducer to control the motor, allowing for accurate detection and correction of temperature changes affecting the arm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is attached to the motor to detect temperature changes, then the motor temperature can be monitored, but the arm temperature cannot be accurately detected due to the reducer between the motor and the arm
Solution Approach 1:
The patent uses the reducer as an intermediary component to mount the temperature sensor. By placing the sensor on the reducer (specifically on the input shaft or housing near the motor connection), the sensor can detect temperature changes that directly reflect both motor and arm temperature variations, serving as a mediator between the motor and arm temperature measurement needs
Solution Approach 2:
The patent shifts the temperature measurement location from the motor (one dimension) to the reducer (another dimension in the transmission chain). This spatial repositioning allows the sensor to capture temperature information at a point that is thermally coupled to both the motor and the arm, providing comprehensive temperature data without requiring direct attachment to the arm
2Speed
If a reducer is placed between the motor and the arm to decelerate rotation, then the arm can be operated at reduced speed, but the temperature sensor on the motor cannot accurately detect arm temperature changes
Solution Approach 1:
The reducer serves a dual function: it acts as both a speed reduction mechanism and as an intermediary mounting platform for the temperature sensor. The sensor mounted on the reducer captures temperature information from the transmission path, providing accurate arm temperature data while the reducer simultaneously performs its speed reduction function
3Ease of operation
If the sensor is mounted on the motor, then the motor control can be implemented, but the control accuracy for arm operation is reduced due to inaccurate temperature detection
Solution Approach 1:
The patent implements improved feedback by mounting the sensor on the reducer to obtain accurate temperature information from the transmission path. This accurate temperature feedback enables the control system to properly compensate for thermal expansion and contraction effects, thereby improving arm operation accuracy while maintaining ease of motor control
Solution Approach 2:
The reducer-mounted sensor acts as an intermediary measurement point that provides accurate temperature feedback for control purposes. This intermediary location captures the thermal state of the entire transmission system, enabling more accurate control compensation compared to motor-only temperature sensing
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 precise control of the motor based on accurate sensor data from the reducer, improving the accuracy of arm operation by directly addressing temperature-related expansions and contractions.
Implementation Method 1
based on a detection value of a sensor mounted on the reducer
Implementation Method 2
a motor, a reducer to decelerate rotational motion output from the motor
Data Source
AI summary
A drive device includes a motor, a reducer to decelerate rotational motion output from the motor, and a target object operable by rotational motion output from the reducer. A controller is configured or programmed to control the motor based on a detection value of a sensor mounted on the reducer.