Electric Tool Motor Brake Failure Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric working machines with brake functions face issues where brake device failures are not detectable, leading to either sudden or inadequate braking, causing user discomfort and safety concerns.
Innovation Solution
Incorporating a failure determiner to monitor motor deceleration and notify the user of brake device failures by determining if deceleration falls outside predetermined ranges, allowing for immediate disablement of the motor drive to prevent unsafe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake device is added to generate braking force when motor stops, then safety is improved and tool bit rotation is inhibited, but device complexity increases and reliability decreases due to potential brake failure
Solution Approach 1:
The control device monitors the actual deceleration of the motor during braking and compares it with the standard deceleration value. Based on this feedback, the system determines whether the brake device is functioning properly and notifies the user of any abnormalities, creating a closed-loop monitoring system that enhances safety without requiring additional mechanical brake components.
Solution Approach 2:
The patent replaces the need for a separate mechanical brake device with an electrical control mechanism. By controlling the motor's electrical deceleration through the control device and monitoring it electronically, the system achieves braking functionality without adding complex mechanical brake components, thus improving reliability while maintaining simplicity.
2Speed
If large breaking force is generated when motor stops, then brake function is fully implemented and tool bit rotation stops quickly, but user comfort decreases and tool bit may loosen due to sudden brake
Solution Approach 1:
The control device adjusts the deceleration parameter dynamically by comparing actual deceleration with a predetermined standard value. The system controls the motor to decelerate at the appropriate rate, preventing both excessive braking force that would cause discomfort and insufficient braking that would fail to stop the tool bit promptly.
3Ease of operation
If small breaking force is generated when motor stops, then user comfort is maintained, but brake function is not fully implemented and tool bit rotation cannot be stopped quickly
Solution Approach 1:
The control device continuously monitors the actual deceleration of the motor and compares it with the standard deceleration value. This feedback mechanism ensures that the braking force is sufficient to stop the tool bit quickly while maintaining user comfort, as the system can detect and alert users to any deceleration abnormalities.
4Device complexity
If brake device failure is not detected, then device complexity remains low, but reliability decreases and unsafe operation may occur
Solution Approach 1:
The control device monitors the actual deceleration of the motor during braking and compares it with the standard deceleration value. Based on this feedback, the system determines whether the brake device is functioning properly and notifies the user of any abnormalities, creating a closed-loop monitoring system that enhances safety without requiring additional mechanical brake components.
Solution Approach 2:
The patent replaces the need for a separate mechanical brake device with an electrical control mechanism. By controlling the motor's electrical deceleration through the control device and monitoring it electronically, the system achieves braking functionality without adding complex mechanical brake components, thus improving reliability while maintaining simplicity.
Data Source
AI summary
An electric working machine comprises a motor, a switch, a drive device, a brake device, and a failure determiner. The switch is configured for operation by a user, has an on-state and an off-state. The drive device is configured to drive the motor in response to the switch being placed in the on-state. The brake device is configured to control deceleration of the motor to a stopped state in response to the switch being placed in the off-state. The failure determiner is configured to monitor deceleration of the motor during controlled deceleration and to determine whether the brake device has failed based on the monitored deceleration.