Motor System Quick Stop via Electromagnetic Braking
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Solution Overview
Problem
Conventional motor systems and fan modules continue to rotate for a short period after power shutdown due to inertia, posing a safety risk and operational inefficiency.
Innovation Solution
A motor system and fan module design incorporating a stator magnetic pole, rotor, driving unit, and stop control unit that generates electricity to change the current path and output current from one end to another, using switches and diodes to quickly stop the motor or fan without energy-storing components, leveraging magnetic forces for braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional motor systems are used without quick stop function, then the motor continues to rotate after power shutdown due to inertia, but this causes safety risks and operational inefficiency
Solution Approach 1:
The patent applies preliminary anti-action by using the motor's own inertia and electromagnetic field to generate a counteracting force before the harmful effect (continued rotation) can occur. When power is shut off, the motor's electromagnetic field is used to generate a braking force that opposes the rotational motion, stopping the motor quickly and preventing safety accidents.
Solution Approach 2:
The patent converts the harmful effect of motor inertia (continued rotation after power off) into a beneficial braking force. By utilizing the motor's electromagnetic field and inertia together, the system generates a counteracting force that quickly stops the motor, transforming the potential safety hazard into an effective quick-stop mechanism.
2Speed
If energy-storing components are used to achieve quick stop, then the stopping speed is improved, but the device complexity and cost increase
Solution Approach 1:
The patent applies self-service by using the motor's own electromagnetic field and mechanical structure to generate the braking force, without requiring external energy-storing components. The motor's inherent electromagnetic field is utilized to create a counteracting force during power shutdown, eliminating the need for additional capacitors, batteries, or complex energy storage systems.
Solution Approach 2:
The patent extracts and eliminates the need for energy-storing components from the system. By using the motor's own electromagnetic field and inertia to generate the braking force, the design removes unnecessary capacitors, batteries, and associated control circuits, thereby simplifying the overall system structure and reducing costs while maintaining quick-stop performance.
3Adaptability or versatility
If fan continues to rotate after power shutdown, then operational flexibility is maintained, but air intake efficiency is reduced due to reverse rotation of failed fans
Solution Approach 1:
The patent applies preliminary anti-action by using the motor's electromagnetic field to generate a counteracting braking force before reverse rotation can occur. When power is shut off, the electromagnetic field creates a force that opposes the rotational motion, quickly stopping the fan and preventing it from rotating in reverse, thereby maintaining air intake efficiency.
Solution Approach 2:
The patent converts the potential harmful effect of reverse rotation (which reduces air intake efficiency) into a beneficial quick-stop mechanism. By utilizing the electromagnetic field to generate a braking force, the system quickly stops the fan before reverse rotation can occur, transforming a potential efficiency loss into an opportunity to maintain optimal air intake performance.
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
Enables rapid stopping of the motor or fan upon power loss, enhancing safety, preventing operational failures, and maintaining air intake efficiency by avoiding reverse rotation of failed fans, suitable for robotic arms and parallel-connected fan systems.
Implementation Method 1
the stator magnetic pole generates electricity that changes a path of an electric current flowing through the stop control unit
Implementation Method 2
the stator magnetic pole outputs an electric current from the first end to the second end or from the second end to the first end thereof, thereby stopping the motor system
Data Source
AI summary
A motor system includes a stator magnetic pole, a driving unit and a stop control unit. The stator magnetic pole is adapted to couple with a rotor for the rotor to rotate relative to the stator magnetic pole. The stator magnetic pole has first and second ends. The driving unit is electrically connected with the stator magnetic pole and drives the rotor to rotate by changing the polarity of the stator magnetic pole. The stop control unit is electrically connected to the stator magnetic pole and the driving unit. If the rotor rotates when the motor system is not electrically powered, the stator magnetic pole generates electricity that changes the path of the electric current flowing through the stop control unit, and the stator magnetic pole outputs an electric current from the first end to the second end or from the second end to the first end thereof. In addition, a fan module is also disclosed to solve the problem.