Robot Control Device Inductance Element Heat Suppression
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Solution Overview
Problem
Existing robot control devices face challenges in miniaturizing choke coils due to high heat generation from regenerative currents, which increases manufacturing costs and complicates noise suppression.
Innovation Solution
Incorporating an inductance element positioned closer to the power conversion unit than the braking unit on the power line, along with a detection unit that short-circuits the power lines to prevent heat generation, and using a power conversion unit with switching elements that turn off in case of abnormalities to manage regenerative currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the size of the choke coil is increased to improve heat resistance, then heat dissipation capability is improved, but manufacturing cost increases and device size increases
Solution Approach 1:
The patent introduces an inductance element as an intermediary component positioned between the power conversion unit and the braking unit. This inductance element acts as a buffer to suppress regenerative current peaks, thereby reducing heat generation in the braking unit without requiring the choke coil to be oversized for heat dissipation. The inductance element absorbs and smooths current fluctuations, protecting the braking unit from thermal stress while allowing the use of a smaller, more cost-effective choke coil design.
2Temperature
If the size of the choke coil is increased to improve heat resistance, then heat dissipation capability is improved, but device size increases
Solution Approach 1:
The inductance element serves as a mediator that reduces the thermal burden on the braking unit by suppressing regenerative current peaks. This allows the system to use a smaller choke coil with adequate heat resistance, as the inductance element pre-processes the current to prevent extreme thermal conditions. The result is a compact overall device size while maintaining sufficient heat management capabilities.
3Object-affected harmful factors
If a choke coil is used to suppress noise, then electromagnetic interference is reduced, but heat generation from regenerative current increases
Solution Approach 1:
The patent segments the noise suppression and heat management functions into two separate components: the inductance element and the braking unit. The inductance element handles noise suppression by filtering high-frequency electromagnetic interference, while the braking unit handles energy dissipation. This segmentation allows each component to be optimized for its specific function, with the inductance element being small and low-loss, and the braking unit being positioned or designed to manage heat effectively.
Solution Approach 2:
The inductance element acts as an intermediary that filters regenerative current before it reaches the braking unit, reducing the amplitude of current peaks that would otherwise generate excessive heat. By smoothing the current waveform, the inductance element reduces the thermal load on the braking unit while still providing effective noise suppression on the power lines.
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 configuration effectively suppresses noise and heat generation in the inductance element, enabling miniaturization and cost reduction of the robot control device while maintaining control accuracy.
Implementation Method 1
an inductance element that is provided on the power line and positioned closer to the power conversion unit side than a connection point between the braking unit and the power line
Implementation Method 2
heat generation of the inductance element due to a short circuit between the power lines
Data Source
AI summary
A robot control device that controls a robot including a motor, the robot control device comprising: a power converter that is connected to the motor by a power line and converts supplied power to power to be supplied to the motor; a brake that brakes the motor by short-circuiting the power lines, and an inductance element that is provided on the power line and positioned closer to the power converter side than a connection point between the brake and the power line.