Electric Tool Pre-Startup Control for Load-Carrying Startup
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Solution Overview
Problem
Existing chain saws with gear transmission mechanisms often have weak starting ability under load, and methods to enhance this, such as increasing gear numbers or sizes, result in increased weight and cost, compromising user experience.
Innovation Solution
A chain saw with a controller that outputs control signals to operate the motor in alternating operation modes, with a pre-startup phase where the drive gear rotates in one direction for a preset time to enhance startup force, followed by normal operation in the opposite direction, allowing for improved load-carrying startup capability without hardware changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the number of gears or gear sizes are increased to enhance load-carrying startup capability, then the startup capability is improved, but the weight and cost of the electric tool increase
Solution Approach 1:
The patent changes the operational parameters of the motor by implementing dual rotation directions and variable speed modes. During the pre-startup phase, the motor rotates in a first direction to build acceleration, then reverses to the second direction for actual startup. This parameter change enables enhanced load-carrying capability without modifying the physical gear structure, thus avoiding weight increase.
Solution Approach 2:
The patent applies preliminary action by implementing a pre-startup phase where the motor rotates in the first direction before the actual startup in the second direction. This preliminary rotation builds up acceleration and prepares the transmission mechanism, enabling the motor to overcome load during startup without requiring larger or more numerous gears.
2Force
If the number of gears or gear sizes are increased to enhance load-carrying startup capability, then the startup capability is improved, but the cost of hardware increases
Solution Approach 1:
The patent utilizes parameter changes in motor operation (rotation direction and speed) rather than hardware modifications. By controlling the motor to rotate in first and second directions with different speeds during pre-startup and startup phases, the system achieves enhanced startup capability using the existing gear structure, thereby avoiding additional hardware costs.
Solution Approach 2:
The patent replaces a mechanical solution (adding more or larger gears) with a control-based solution. Instead of modifying the mechanical transmission system, the invention uses electronic control of motor rotation parameters to achieve the desired effect, simplifying the manufacturing process and reducing costs.
3Force
If hardware configuration is changed to enhance load-carrying startup capability, then the startup capability is improved, but the shape of the electric tool changes
Solution Approach 1:
The patent achieves enhanced startup capability through parameter changes in motor operation rather than hardware modifications. The existing tool structure and shape are preserved while the controller adjusts motor rotation direction and speed to improve load-carrying startup performance.
4Force
If the motor rotates in opposite directions with preset timing control, then the load-carrying startup force is enhanced, but the control complexity increases
Solution Approach 1:
The controller implements preliminary action by executing a predetermined sequence: first rotating the motor in the first direction for a preset time, then reversing to the second direction for startup. This structured approach, while adding control steps, uses simple timing and direction reversal logic that can be efficiently implemented in existing motor control systems.
Solution Approach 2:
The motor operation follows a periodic pattern with distinct phases (pre-startup rotation followed by startup rotation). This periodic control structure, managed by the controller, enables enhanced startup force through systematic alternation between rotation directions and speeds, using programmable logic rather than complex mechanical mechanisms.
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 approach enhances the load-carrying startup force of the chain saw by utilizing a pre-startup phase to acquire an acceleration parameter, increasing the driving force during normal startup without altering the tool's hardware or weight, thus improving user experience.
Implementation Method 1
a motor configured to rotate to drive the drive structure to operate
Data Source
AI summary
An electric tool includes a drive structure, a motor, a driver circuit, and a controller. The controller is configured to output a first control signal to control the motor to drive the drive structure to operate in a first operation mode for a preset period of time in response to receiving a start instruction. After the preset period of time, the controller will output a second control signal to control the motor to drive the drive structure to operate in a second operation mode to a preset state. The first operation mode and the second operation mode are two opposite operation modes.