Robot Arm Brake Overexcitation Cooling to Limit Power Peaks
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Solution Overview
Problem
Existing control devices for robot arms with overexcitation-type electromagnetic brakes fail to adequately manage the increased power consumption and cooling requirements during motor electrification, leading to inefficient energy usage and potential overheating.
Innovation Solution
A control method and device that includes controlling the fan power consumption to be lower during the overexcitation period and higher after the period, along with shifting the overexcitation timings of electromagnetic brakes to prevent power peaks and optimize cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If overexcitation is applied to the electromagnetic brake to release the brake, then the brake is released and the motor can operate, but the power consumption of the control device temporarily increases
Solution Approach 1:
The fan speed is dynamically adjusted based on the operational state of the electromagnetic brake. During overexcitation period, the fan operates at first speed; after overexcitation, it switches to second speed. This dynamic adjustment allows the system to adapt cooling capacity to actual heat generation, reducing unnecessary power consumption while maintaining brake release reliability
Solution Approach 2:
The control device changes the operating parameters of the cooling fan based on the timing relative to electromagnetic brake overexcitation. By switching fan speed between two distinct states (first speed during overexcitation, second speed after overexcitation), the system optimizes the balance between cooling requirements and power consumption
2Temperature
If the fan operates at high power consumption continuously, then cooling efficiency is improved, but energy waste increases during periods when excessive cooling is not needed
Solution Approach 1:
The cooling fan operates in periodic cycles with two distinct speed states. It runs at first speed during the overexcitation period when heat generation is manageable, then switches to second speed after overexcitation when heat generation increases. This periodic operation eliminates continuous high-speed running, reducing energy waste while maintaining appropriate cooling at each stage
Solution Approach 2:
The fan speed is made dynamic rather than static, adjusting to match the thermal conditions at different operational phases. The system transitions from first speed to second speed based on the completion of overexcitation, ensuring cooling capacity matches actual thermal requirements and avoiding energy waste from excessive cooling
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
Reduces power consumption and cooling demands, preventing overheating while maintaining efficient operation of the control device, thereby reducing the size and cost of the control power supply.
Implementation Method 1
a fan cooling the control device... controlling the fan in such a way that the fan cools the control device
Implementation Method 2
a motor braked by an overexcitation-type electromagnetic brake... overexcitation control of the electromagnetic brake
Data Source
AI summary
A method according to the present disclosure includes: (a) carrying out overexcitation of an electromagnetic brake; (b) controlling a fan cooling a control device in such a way that a power consumption of the fan becomes a first power consumption in an overexcitation period during which the overexcitation is carried out; and (c) controlling the fan in such a way that the power consumption of the fan becomes a second power consumption higher than the first power consumption, after the overexcitation period.