Fast Pulse Magnetizing Apparatus with GTO Switch and Series Resistor
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Solution Overview
Problem
Existing fast pulse magnetizing apparatuses face limitations in achieving superior functional performance, reliability, and safety due to variable circuit parameters and heat dissipation issues during high-current pulses, which affect the consistency and efficiency of magnetization.
Innovation Solution
The apparatus incorporates a GTO power thyristor and a series-added resistor, along with a solenoid of 'ship coil' geometry and thermal management features, to manage high current variations and improve heat dissipation, using masks with a junction element for precise alignment and thermal stability, and a flat copper wire solenoid for efficient current confinement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a high-current pulse is used for fast magnetization, then magnetization speed is improved, but heat dissipation problems worsen
Solution Approach 1:
The circuit is segmented into multiple capacitor discharge units (CDUs) that can operate independently or in combination. Each CDU handles a portion of the total current, distributing the thermal load across multiple components rather than concentrating it in a single high-current path, thereby enabling fast magnetization while managing heat dissipation through parallel operation.
Solution Approach 2:
A recirculation diode is introduced as an intermediary component to manage current flow during the magnetization process. The diode enables controlled recirculation of current through the inductor, allowing the system to maintain high current pulses for fast magnetization while providing a dedicated path for current management that prevents uncontrolled thermal buildup and improves heat dissipation efficiency.
2Manufacturing precision
If circuit parameters are varied to optimize magnetization, then magnetization precision is improved, but system reliability worsens
Solution Approach 1:
The system employs dynamically adjustable circuit parameters through multiple capacitor discharge units with variable capacitance values. Each CDU can be independently configured to optimize the current pulse characteristics for specific magnetization requirements, achieving precise control over magnetization parameters while maintaining system reliability through modular architecture that allows safe operating configurations.
Solution Approach 2:
The invention implements variable circuit parameters by providing multiple capacitors with different capacitance values (C1, C2, C3) and configurable series/parallel arrangements. This allows the system to change electrical parameters dynamically to achieve precise magnetization control for different applications while maintaining reliability by selecting appropriate parameter combinations that avoid excessive stress on components.
3Manufacturing precision
If multiple capacitors are used to control current pulse, then magnetization control precision is improved, but device complexity worsens
Solution Approach 1:
The multiple capacitor discharge units are designed with universal functionality, where each CDU can operate independently or in combination with others to achieve various magnetization requirements. The switch network provides multi-functionality by enabling different connection configurations (series, parallel, or individual operation) of the same capacitor set, thereby achieving precise magnetization control without proportionally increasing device complexity through redundant components.
Solution Approach 2:
The system uses periodic switching of the capacitor discharge units to achieve precise control over the current pulse characteristics. By sequentially or selectively activating different CDU combinations, the system can generate varied current profiles for different magnetization needs while using a fixed set of components, reducing overall device complexity compared to having separate dedicated circuits for each function.
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 configuration results in a stable and efficient magnetization process with a narrower current pulse, enhanced thermal management, and improved reliability, allowing for precise control of magnetization currents and increased magnetic field uniformity.
Implementation Method 1
capacitors, having a capacitance C, which are charged slowly at a voltage V, i.e., to the energy 1/2CV^2... The apparatus comprises a GTO power thyristor which allows to rapidly discharge the capacitors on an inductor Lcoilsolenoid
Implementation Method 2
an inductor Lcoilsolenoid which generates the magnetizing field... when the electrostatic energy has all been converted into magnetic energy 1/2LI^2
Implementation Method 3
an added resistor Radd, the insertion of which in series in the magnetizing circuit allows to have a narrower current pulse
Implementation Method 4
a solenoid 5, 51... an inductor Lcoilsolenoid which generates the magnetizing field... The pulsed current that flows through the conductors of the inductor generates a pulsed magnetic field which magnetizes the permanent magnets
Implementation Method 5
The pulse would charge the capacitors. To prevent this from occurring, a recirculation diode D is used
Implementation Method 6
thermal management features... enhanced thermal management... junction element for precise alignment and thermal stability
Implementation Method 7
The apparatus comprises a GTO power thyristor which allows to rapidly discharge the capacitors... heat dissipation issues during high-current pulses
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A fast pulse magnetizing apparatus including a magnetizing circuit provided with capacitors having a capacitance C. which are charged slowly at a voltage V, to the energy 1/2CV^2, by means of converters; the capacitors are discharged rapidly on an inductor, which generates a magnetizing field used to magnetize a permanent magnet; the apparatus is characterized in that it includes an added resistor, which Is inserted In series in the magnetizing circuit and reduces the width of the current pulse, so as to generate induced currents necessary for magnetization. The circuit furthermore includes a GTO (gate turn-off) power thyristor used in the circuit as an electronic switch, The apparatus furthermore includes magnetization masks, which are mutually joined so that the electrical juction is far from the work area. The apparatus furthermore Includes a separate solenoid, which is constituted by a flat wire bent edgeways or machined from solid copper and provided with a lateral passage to facilitate the production process and improve the uniformity of the magnetizing field.