Brake-Equipped Motor Voltage Stabilization via Feedback Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor driving apparatuses for brake-equipped motors in machine tools and robots face issues with unstable brake coil voltage due to supply voltage fluctuations during motor operation, leading to potential coil damage and inefficient braking times.
Innovation Solution
A motor driving apparatus with a voltage conversion circuit that feedback-controls the voltage applied to the brake, increasing it briefly upon brake release and reducing it afterwards to stabilize the braking action and minimize brake coil deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single DC power supply is used for both motor and brake driving, then device complexity is reduced, but brake coil voltage becomes unstable during motor operation
Solution Approach 1:
A voltage conversion circuit is introduced as an intermediary between the single DC power supply and the brake coil. This circuit converts and stabilizes the voltage before supplying it to the brake coil, thereby resolving the voltage instability caused by using a shared power supply while maintaining the simplicity of the single power supply configuration.
Solution Approach 2:
The voltage conversion circuit dynamically adjusts voltage parameters based on the operating state. During motor acceleration and deceleration when voltage fluctuates, the circuit converts the unstable DC voltage into a stable voltage for the brake coil, ensuring reliable brake operation while allowing the use of a single power supply source.
2Speed
If high voltage is applied to the brake coil during motor acceleration, then brake response speed is improved, but brake coil deterioration accelerates
Solution Approach 1:
The voltage conversion circuit dynamically adjusts the output voltage based on real-time motor operating conditions. During motor acceleration when fast brake response is needed, the circuit provides high voltage to the brake coil. During normal operation, it reduces the voltage to a lower level, thereby extending brake coil service life while maintaining rapid brake response capability when required.
Solution Approach 2:
The system applies high voltage to the brake coil only during specific periods when motor acceleration occurs and fast braking is needed. During other periods, the voltage is reduced to a maintenance level, creating a periodic high-low voltage pattern that balances response speed requirements with component longevity.
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
The solution stabilizes the brake coil voltage, preventing damage and reducing the time required for brake engagement and disengagement, while allowing a single power supply to be used for both motor and brake driving, thus enhancing reliability and efficiency.
Implementation Method 1
a voltage conversion circuit via which a voltage supplied from the motor/brake driving DC power supply is applied to the brake feedback-controls the voltage applied to the brake
Implementation Method 2
motor 102 can be braked by de-energizing the coil of brake 103
Data Source
AI summary
A motor driving apparatus for driving and braking a motor equipped with a brake comprises a motor/brake driving DC power supply which is used both as a motor driving power supply and as a brake driving power supply, wherein when the motor/brake driving DC power supply is being used as the motor driving power supply, a voltage conversion circuit via which a voltage supplied from the motor/brake driving DC power supply is applied to the brake feedback-controls the voltage applied to the brake. This configuration serves to reduce the loss (due to temperature rise) in the brake coil of the motor being driven to move a robot arm.