Motor Drive System Voltage Segmentation for Compact Monitoring
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Solution Overview
Problem
Existing motor drive systems for robots face challenges in safely managing increased output voltage, leading to potential motor failure or excessive robot arm velocity due to power supply failures, which requires larger and more costly monitoring circuits to prevent these issues.
Innovation Solution
A motor drive system with a power supply device that includes a first and second power supply series-coupled to a reference potential, providing a sum voltage to the drive control circuit, and a monitoring circuit that detects and shuts off or reduces power when voltages exceed set values, with power supplied to the monitoring circuit from both power supplies, allowing for smaller insulating parts and reduced size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the output voltage of the power supply is increased to enable upsizing of robot arms and increasing driving speeds, then the power supply capability is improved, but the monitoring circuit scale must be increased to maintain safety, causing increase in size and cost
Solution Approach 1:
The power supply is divided into a first power supply and a second power supply connected in series. The monitoring circuit only monitors the voltage of the second power supply rather than the total output voltage. This segmentation allows the monitoring circuit to operate at a lower voltage level, reducing its scale and cost while still ensuring safe operation of the motor.
2Measurement precision
If the failure voltage of the monitoring circuit is increased to match the higher output voltage of the power supply, then the monitoring accuracy is improved, but the size and cost of the monitoring circuit increase
Solution Approach 1:
The voltage monitoring function is segmented from the total power supply voltage. Instead of monitoring the full output voltage (V1 + V2), the monitoring circuit only detects the voltage of the second power supply (V2). This segmentation enables the use of smaller, lower-voltage-rated components in the monitoring circuit while maintaining effective safety monitoring.
Solution Approach 2:
The first power supply acts as an intermediary that provides a reference potential and isolates the monitoring circuit from the full high voltage. The monitoring circuit monitors an intermediate voltage level (V2) rather than the total voltage, enabling safe and effective monitoring with reduced circuit scale.
Data Source
AI summary
A motor drive system includes a motor, a drive control circuit controlling driving of the motor, a power supply device having a first power supply coupled to a reference potential and a second power supply series-coupled to the first power supply, and supplying a second voltage as a sum value of a first voltage as an output voltage of the first power supply and an output voltage of the second power supply to the drive control circuit, and a monitoring circuit detecting the first voltage and the second voltage and shutting off or reducing electric power supply to the drive control circuit when the detected first voltage becomes a predetermined first set value or more or the detected second voltage becomes a predetermined second set value or more, wherein electric power for driving is supplied to the monitoring circuit from between the first power supply and the second power supply.