Servomotor Control Device for Emergency Stop Segmentation
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Solution Overview
Problem
Conventional production systems face efficiency decreases due to the time-consuming process of emergency-stopping and restarting servomotors, which involves frequent operation of electromagnetic contactors and can inadvertently stop non-relevant servomotors, leading to increased wear and reduced productivity.
Innovation Solution
A servomotor control device with an inverter system that uses a power source disconnect circuit and a monitoring circuit to manage the supply of power to the servomotor, allowing for controlled stopping and restarting without discharging capacitors and minimizing unnecessary contactor operations, while ensuring safety by distinguishing between relevant and irrelevant servomotor ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electromagnetic contactor is operated to disconnect power every time emergency stop is needed, then the servomotor can be stopped safely, but the capacitor in the servo amplifier must be recharged each time, increasing stop and restart time
Solution Approach 1:
The power supply system is segmented into two independent paths: a main power supply path for continuous operation and an emergency stop path using a separate DC power source. This segmentation allows the emergency stop function to operate independently without affecting the main power supply capacitor charge state, thereby resolving the contradiction between safety and restart time.
Solution Approach 2:
A separate DC power source acts as an intermediary for the emergency stop function. Instead of using the main power supply that charges the capacitor, this independent DC source provides power specifically for emergency stop operations, eliminating the need to discharge and recharge the capacitor during emergency stops.
2Reliability
If the electromagnetic contactor is operated frequently for emergency stops, then the servomotor can be stopped when needed, but the contactor and relay circuit experience increased wear and shorter replacement cycles
Solution Approach 1:
The emergency stop function is extracted from the main power control system. By using a separate DC power source and independent control circuitry dedicated solely to emergency stop operations, the electromagnetic contactor and relay circuits in the main power path are shielded from frequent emergency stop operations, extending their service life while maintaining emergency stop capability.
Solution Approach 2:
A redundant emergency stop control path is created with its own DC power source and control circuits. This copying of the emergency stop function to an independent system allows the original power control circuits to remain untouched during emergency stops, reducing wear on those components.
3Device complexity
If the electromagnetic contactor is arranged between multiple servo amplifiers and the power source, then centralized power control is achieved, but emergency stopping one servomotor causes concurrent stopping of other servomotors not in the common area
Solution Approach 1:
The power supply and control systems are segmented by creating independent DC power sources for each servo amplifier. This segmentation allows the emergency stop function to be localized to individual servomotors or groups, preventing cascading stops across the entire system while maintaining centralized control architecture benefits.
Solution Approach 2:
Each servo amplifier is equipped with its own DC power source and emergency stop control circuits, providing local quality and independence. This allows emergency stop actions to be localized to specific servomotors based on their operational context, rather than affecting all servomotors uniformly, thereby maintaining productivity of non-affected units.
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 solution enhances the efficiency of production systems by reducing the downtime and wear of components, improving the reliability of servomotor control, and minimizing the frequency of contactor operations, thereby maintaining productivity and safety.
Implementation Method 1
an inverter for driving a servomotor by converting a direct current into an alternating current and supplying the converted alternating current to the servomotor
Implementation Method 2
the servomotor is stopped by disconnecting a connection between a power source and the servomotor by an electromagnetic contactor arranged between the power source for supplying a power-supply voltage to the servomotor and a servo amplifier for controlling the servomotor
Data Source
AI summary
A servomotor control device includes a servomotor control circuit for controlling an inverter such that an alternating current is supplied to a servomotor when receiving a safety signal, and for controlling the inverter such that the alternating current is not supplied to the servomotor when not receiving the safety signal, and a servomotor monitoring circuit for stopping the servomotor by stopping transmission of the safety signal to the servomotor control circuit when determining to stop the servomotor, and for stopping the servomotor by disconnecting supply of a direct current to the inverter with a power source disconnect circuit and stopping the transmission of the safety signal to the servomotor control circuit when determining that at least one of the power source disconnect circuit, the safety signal, and the servomotor control circuit is not normal.