Stator Coil Resonance Heating to Lower Induction Power Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for manufacturing stators require high-voltage power supply equipment for induction heating due to the large number of turns in the coils, increasing manufacturing costs.
Innovation Solution
A method involving a three-phase coil disposed in an annular stator core, with capacitors connected between the power supply and the coil ends to form a resonant circuit, reducing the power supply voltage by making three-phase alternating current pass through the coil for induction heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a separate coil for induction heating is provided, then the stator core can be heated, but the manufacturing cost increases
Solution Approach 1:
The patent makes the stator coils serve dual functions: both as electromagnetic coils for motor operation and as induction heating coils for manufacturing. By utilizing the existing coils for both purposes, the need for separate heating coils is eliminated, reducing device complexity and manufacturing cost while achieving effective heating of the stator core
Solution Approach 2:
The stator coils perform self-heating by utilizing their own electromagnetic properties during the manufacturing process. The coils generate heat through their inherent resistance when three-phase alternating current passes through them, eliminating the need for external heating equipment and reducing overall system complexity
2Temperature
If three-phase alternating current is made to pass through the coil for induction heating, then the stator core can be heated, but high-voltage power supply equipment is required
Solution Approach 1:
The patent changes the electrical parameters by introducing resonant circuits that resonate at the same frequency as the power supply. This resonance condition transforms the coil circuit into a high-impedance circuit, allowing effective heating at lower voltages. The resonant frequency is matched to the power supply frequency to maximize heating efficiency while minimizing voltage requirements
Solution Approach 2:
The patent utilizes periodic three-phase alternating current at specific frequencies (e.g., 1 kHz or greater) to drive the resonant circuits. This periodic action creates sustained resonance in the coil circuits, enabling continuous heating effect at reduced voltage levels compared to conventional DC or low-frequency AC heating methods
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 reduces the power supply voltage required for induction heating, thereby decreasing the cost of power supply equipment and enhancing the efficiency of the stator manufacturing process.
Implementation Method 1
making a three-phase alternating current pass through the three-phase coil, thereby inductively heating the stator core
Implementation Method 2
capacitors respectively connected between a power supply configured to supply the three-phase alternating current to ends of the three-phase coil and each one of the ends of coils of respective phases in the three-phase coil, whereby a circuit comprising the three-phase coil serves as a resonant circuit
Data Source
AI summary
To reduce the power supply voltage during induction heating using a coil provided in a stator core. A method for manufacturing a stator according to one aspect of the present disclosure includes: disposing a three-phase coil in an annular stator core; and making a three-phase alternating current pass through the three-phase coil, thereby inductively heating the stator core. Capacitors are respectively provided between a power supply configured to supply the three-phase alternating current to ends of the three-phase coil and each one of the ends of coils of respective phases in the three-phase coil, whereby a circuit comprising the three-phase coil serves as a resonant circuit when the three-phase alternating current is made to pass through the three-phase coil.