Modular Servomotor Drive with Attachable Power Source Regeneration
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Solution Overview
Problem
Conventional servomotor drive devices with both resistance regeneration and power source regeneration functions are not capable of dynamically adding the power source regeneration function based on the operating conditions of industrial robots, leading to inefficient energy handling and device downsizing issues.
Innovation Solution
A servomotor drive device with a first converter, a regenerative resistor circuit, and a second converter that can be attached in an attachable and detachable manner, along with control units to manage the switching elements and rectifier elements, allowing for the power source regeneration function to be added or removed based on operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a servomotor drive device with both resistance regeneration and power source regeneration functions is used, then the regenerative energy can be handled in all operating conditions, but the device size increases and complexity increases
Solution Approach 1:
The patent applies dynamics by making the converter structure changeable based on operating conditions. The second converter with power source regeneration function can be selectively connected or disconnected from the circuit through switching elements, allowing the system to dynamically adapt between resistance regeneration mode (smaller, simpler) and combined regeneration mode (larger, more capable) according to the actual regenerative energy levels and operating conditions of the industrial robot
Solution Approach 2:
The patent implements multi-functionality by designing a converter system that can perform both resistance regeneration and power source regeneration functions. The first converter with resistance regeneration serves as the base function, while the second converter with power source regeneration capability is added to create a universal system that can handle various operating conditions, making the device adaptable to different regenerative energy scenarios
2Loss of energy
If a servomotor drive device with power source regeneration function is used, then larger amount of regenerative energy can be handled, but the device size increases
Solution Approach 1:
The patent applies segmentation by dividing the converter system into two separate converters: the first converter with resistance regeneration function and the second converter with power source regeneration function. This segmentation allows the system to handle larger regenerative energy capacities while maintaining modularity, so the power source regeneration capability can be selectively activated only when needed, avoiding the penalty of always carrying the larger device structure
3Device complexity
If a servomotor drive device with resistance regeneration function is used, then device size is reduced, but the regenerative energy handling capacity is limited
Solution Approach 1:
The patent makes the system dynamically adaptable by enabling selective connection of the second converter. When operating conditions require only limited regenerative energy handling, the system operates in resistance regeneration mode with simpler structure. When operating conditions change to require larger regenerative energy capacity, the second converter is connected to expand the system's capability, thus achieving dynamic adaptation between simplicity and capability
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 efficient handling of regenerative energy by dynamically switching between resistance regeneration and power source regeneration, optimizing energy management and device sizing according to the industrial robot's operating conditions.
Implementation Method 1
a first converter having a plurality of first rectifier elements configured to convert an AC current from an AC power source into a DC current
Implementation Method 2
a regenerative resistor circuit connected in parallel to the first converter and having a first switching element and a regenerative resistor configured to consume regenerative energy
Data Source
AI summary
A servomotor drive device has a first converter, a regenerative resistor circuit having a first switching element and a regenerative resistor, a first connection part configured to connect a second converter in parallel to the regenerative resistor circuit in an attachable and detachable manner, and a first control unit configured to control the on and off states of the first switching element. The second converter has a second switching unit and a second control unit configured to return regenerative energy to an AC power source side by bringing the second switching element into the on state when the second converter is connected to the first connection part.