Servomotor Control Apparatus for Brake Malfunction Position Stability
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Solution Overview
Problem
Conventional servomotor control systems fail to prevent position discrepancies in machines driven by servomotors when a brake malfunction occurs, particularly in cases of sudden brake failure.
Innovation Solution
A servomotor control apparatus that periodically monitors the actual position using a position detector and adjusts the power supply to the servo amplifier and motor torque command based on predetermined thresholds, either powering on/off the servo amplifier or disabling motor torque to maintain position stability during brake malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the posture is maintained by powering the motor only when braking performance reduction is detected, then energy consumption is reduced, but position stability cannot be ensured during sudden brake failure
Solution Approach 1:
The system performs preliminary action by periodically monitoring the actual position even before brake failure occurs. When the brake is operated, the system proactively checks position deviations and prepares to power the servo amplifier if a deviation is detected, rather than waiting for brake performance degradation to manifest.
Solution Approach 2:
The system implements feedback by continuously monitoring the actual position through a position detector and comparing it with the expected position. When a deviation exceeds a predetermined threshold, the feedback loop triggers the servo amplifier to power on and issue motor torque commands to correct the position, ensuring closed-loop control for position stability.
2Stability of the object's composition
If the electromagnetic brake is operated to maintain position, then position stability is improved, but position discrepancies occur when brake malfunction happens
Solution Approach 1:
The system introduces an intermediary monitoring mechanism (position detector and control apparatus) that acts as a mediator between the electromagnetic brake and the motor. When brake malfunction is detected through position deviation, the intermediary system activates the motor to compensate for the brake failure, providing a backup control path.
Solution Approach 2:
The system applies beforehand cushioning by preparing the motor and servo amplifier as a backup system before brake failure occurs. The periodic position monitoring during brake operation ensures that when brake reliability deteriorates, the motor is already ready to take over and prevent position discrepancies.
3Stability of the object's composition
If periodic position monitoring is implemented during brake operation, then position stability is improved, but system complexity increases
Solution Approach 1:
The system achieves universality by using the existing position detector and control apparatus for multiple functions: normal operation control, brake performance monitoring, and failure detection. This multi-functionality allows periodic position monitoring during brake operation without adding dedicated separate components, thereby limiting the increase in system complexity.
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
Effectively prevents position differences in machines by promptly responding to brake malfunctions, ensuring position stability even in cases of electromagnetic brake failure, and reducing unintended operation or torque output.
Implementation Method 1
in a state in which a servo amplifier is powered off and an electromagnetic brake is operated
Implementation Method 2
an electromagnetic contactor of a servo feed circuit is closed to supply electric power to the servo amplifier
Data Source
AI summary
A servomotor control apparatus according to the present invention is a control apparatus for controlling a machine having one or a plurality of movable portions each driven by a servomotor. In the servomotor control apparatus, while an electromagnetic brake is operated, an actual position obtained by a position detector is periodically monitored. The actual position is compared with the actual position at the time of actuating the electromagnetic brake. When the actual positions are different by a predetermined value or more, any of the issue of a motor torque to maintain the position, the actuation of a regenerative brake, or a control means for continuing a control to maintain the position without operating the electromagnetic brake, even if the servomotor stops for a certain period of time during playback operation, is performed.