Soft Start Device for Power Cutting Machine Tool
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electronic tools lack a soft start device to manage surge currents upon activation, leading to noise and potential damage to internal components.
Innovation Solution
A soft start device with a control circuit group, light emitting circuit group, and trigger circuit group that gradually increases the motor's working voltage and speed, reducing noise and protecting internal components by using a control circuit, light emitting unit, and trigger circuit to manage the activation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic tool is switched on without a soft start device, then the activation is immediate and simple, but a great surge current enters the electronic tool causing enormous noise and potential damage to connection interfaces or internal components
Solution Approach 1:
The patent introduces a light-emitting unit as an intermediary between the power source and the motor. The light-emitting unit converts electrical energy to optical energy, which then acts on the photo-sensitive resistor to gradually reduce its resistance, thereby gradually increasing the motor's working voltage and avoiding direct surge current input
Solution Approach 2:
The patent implements preliminary action by using the light-emitting unit to pre-condition the circuit before full power is applied to the motor. The gradual reduction of photo-sensitive resistor resistance prepares the circuit for full power operation, preventing surge current damage before it occurs
2Object-affected harmful factors
If the motor is activated directly without gradual voltage increase, then the device structure remains simple, but enormous noise is generated that may frighten the operator or spectators
Solution Approach 1:
The light-emitting unit serves as a mediator that converts electrical energy to optical energy, which then gradually reduces the photo-sensitive resistor's resistance. This intermediary mechanism enables gradual motor startup and noise reduction without requiring complex direct electrical control circuits
3Reliability
If a soft start device is installed to delay activation time, then surge current damage is prevented, but the activation process becomes more complex with additional control circuits
Solution Approach 1:
The patent replaces traditional mechanical or direct electrical soft start control mechanisms with an optical control system. The light-emitting unit and photo-sensitive resistor combination provides gradual voltage increase through optical interaction, simplifying the control circuit structure while maintaining reliable surge current protection
Solution Approach 2:
The photo-sensitive resistor acts as an intermediary element that responds to optical energy from the light-emitting unit. This intermediary mechanism provides smooth, gradual resistance change that protects against surge current without requiring complex multi-stage electrical control circuits
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 reduces noise and protects internal components by gradually increasing the motor's speed and voltage during activation, preventing damage from surge currents.
Implementation Method 1
a light emitting unit of the light emitting circuit group generates light fading up
Implementation Method 2
make the resistance of a sensing unit of the trigger circuit group decrease gradually
Data Source
AI summary
A soft start device for a power cutting machine tool, a control circuit group includes two end, one of which is connected with an input power source and the other is connected with each of two control switches. When the input power source provides a working voltage for the control circuit group, the control circuit group outputs a low-level signal to the control switches to enable a light emitting circuit group to lighting gradually from dark to light, whereby a resistance of a trigger circuit group decreases gradually to make motor setup the working voltage. Next, the control circuit group outputs a high-level signal after a period of time, to turn on the control switches for inputting voltage to the motor directly. The soft start device can not only decrease the noise during activation of the motor but effectively protect the internal components of an electronic device from damage.