Built-In Arm Motor Layout for Compact Low-Vibration Transfer Robots
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Solution Overview
Problem
Conventional transfer robots face challenges in miniaturization and vibration reduction due to the use of external motors and reduction gears, which affect the precision and efficiency of object transfer operations.
Innovation Solution
The integration of a built-in motor within the arm structure, which includes a rotor and stator design that allows direct pivoting of the arm without external reduction gears, reducing the height and width of the arm and minimizing vibration and mechanical losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If external motors and reduction gears are used, then the robot can transfer objects, but the robot size increases and vibration occurs
Solution Approach 1:
The motor is merged with the robot arm structure itself. The stator is integrated into the first arm while the rotor connects to the second arm, eliminating the need for separate external motors and reduction gears. This integration directly reduces the robot's overall size while maintaining transfer functionality.
Solution Approach 2:
The reduction gear mechanism is extracted/removed from the system entirely. The patent achieves direct drive operation where the motor's rotational force is transmitted directly to the robot arm without intermediate gear reductions, eliminating the space required for gear mechanisms and reducing mechanical complexity.
2Loss of energy
If external motors and reduction gears are used, then the robot can transfer objects, but mechanical losses increase
Solution Approach 1:
The reduction gear mechanism is removed from the system, eliminating the mechanical losses associated with gear transmission. The direct drive configuration allows rotational force to be transmitted from the motor directly to the robot arm without energy loss through intermediate mechanical components.
3Volume of moving object
If the motor is integrated into the arm, then the robot is miniaturized, but rotation control when power is off becomes problematic
Solution Approach 1:
A brake mechanism is introduced as an intermediary component between the motor and the robot arm. This brake prevents unintended rotation of the arm when power is not supplied to the motor, providing stable position control during powered-off states while allowing free integration of the motor into the arm structure.
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
This design enables the miniaturization of the transfer robot arms, enhances precision, and reduces operational errors, contributing to improved efficiency and cost-effectiveness by eliminating the need for external motors and gears.
Implementation Method 1
The brake is provided at the another arm to apply a force to the stator so as to suppress relative rotation between the stator and the rotor when electric power is not supplied to the motor
Implementation Method 2
The motor includes a rotor rotatable around the shaft axis to rotate the another arm around the shaft axis, and a stator connected to the one arm
Data Source
AI summary
A transfer robot includes one arm, another arm, a motor, and a brake. The another arm is connected to the one arm via a shaft such that the another arm is rotatable relatively with respect to the one arm around a shaft axis of the shaft. The motor includes a rotor rotatable around the shaft axis to rotate the another arm around the shaft axis, and a stator connected to the one arm. The brake is provided at the another arm to apply a force to the stator so as to suppress relative rotation between the stator and the rotor when electric power is not supplied to the motor.