Industrial Robot Hollow Chamber Drive System
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Solution Overview
Problem
Industrial robots face challenges in improving throughput and responsiveness due to increased motor inertia and complex control operations, especially when sudden stops occur, leading to accelerated wear and maintenance issues.
Innovation Solution
The industrial robot employs a hollow chamber with multiple drive devices, including a first motor and additional motors connected in series, with controllers ensuring equivalent outputs and a brake system for controlled power supply, allowing for balanced torque distribution and reduced complexity in control operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If motor output is increased to increase operating speeds, then productivity is improved, but motor inertia is increased, leading to worsened responsiveness
Solution Approach 1:
The patent divides the motor system into multiple smaller motors (first motor and second motor) that operate cooperatively to drive a single joint shaft. This segmentation allows the system to achieve the required total output power without increasing the inertia of individual motors, thereby maintaining responsiveness while improving productivity.
2Reliability
If multiple motors are used to drive a single joint shaft, then responsiveness is improved, but control operation complexity is increased
Solution Approach 1:
The patent merges the control functions of multiple motors into a unified control system where the first motor and second motor are coordinated through a common controller. This integration simplifies control operations by managing multiple motors as a coordinated system rather than independent units, reducing the complexity of control operations while maintaining improved responsiveness.
3Reliability
If multiple motors are simultaneously stopped during emergency stop, then safety is ensured, but sudden reactive forces act on arms and speed reducers, accelerating deterioration
Solution Approach 1:
The patent implements a staged stopping sequence where the first motor is stopped first, followed by the second motor after a predetermined time delay. This preliminary action of stopping motors in sequence rather than simultaneously prevents sudden reactive forces from acting on the mechanical components, thereby extending component lifespan while still ensuring safety during emergency stop conditions.
4Productivity
If manufacturing lines are shortened by reducing robot footprint, then productivity is improved, but motor size must be reduced, limiting output capability
Solution Approach 1:
The patent uses multiple smaller motors instead of a single large motor to achieve the required output power. This segmentation allows the system to maintain high power capability while reducing the footprint of individual motor units, enabling compact robot design that fits shortened manufacturing lines while preserving the necessary output capability for improved goods throughput.
Data Source
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AI summary
An industrial robot includes a hollow chamber (3) rotatably supported by a base (2), an arm (4) rotatably supported by the hollow chamber, and drive devices (91,92,11,12) provided in the hollow chamber and configured to drive the arm.