Superconducting WFSM Field Coil Pre-Charging for Faster Startup
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Solution Overview
Problem
The responsiveness of wound field synchronous motors (WFSMs) with superconducting coils is low due to the long time required to reach target current values, leading to deteriorated control responsiveness.
Innovation Solution
A method of controlling the motor by charging the field coil before starting, using a controller to compare target and rated speeds, and driving the motor once the field coil is charged to a preset ratio, thereby improving response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a superconducting field coil is used in a wound field synchronous motor, then cost is reduced and magnetic field control capability is improved, but responsiveness deteriorates due to long charging time
Solution Approach 1:
The field coil is charged to a preset ratio (e.g., 50% or more) before the motor is started. This preliminary charging action reduces the time required to reach target current values during operation, thereby improving responsiveness while maintaining the cost and control advantages of superconducting field coils
2Force
If the field coil is fully charged before operation, then magnetic field strength is sufficient, but start-up time increases due to long charging duration
Solution Approach 1:
Instead of requiring 100% charging of the field coil before motor operation, the system charges the field coil to a preset ratio (50% or more) which is sufficient for partial action. During motor operation, the field current is adjusted to achieve the required magnetic field strength, thereby reducing start-up time while maintaining adequate magnetic field performance
3Adaptability or versatility
If field current is adjusted during motor operation, then magnetic field control flexibility is improved, but control complexity increases
Solution Approach 1:
The field coil is pre-charged to a preset ratio before motor operation, establishing an initial magnetic field. During operation, the controller adjusts field current based on operating conditions (speed, load), providing flexible magnetic field control. This approach balances control flexibility with manageable complexity by combining preliminary action with adaptive control
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 allows for immediate provision of required output by enhancing the motor's responsiveness and reducing start-up time, even when the field coil is only partially charged.
Implementation Method 1
a superconducting field coil being wound thereon
Data Source
AI summary
A motor includes a stator on which an armature coil is wound, a rotor disposed inside the stator, a superconducting field coil being wound thereon and, a controller configured to control the motor, in which the controller is configured to control an armature current supplied from an AC source to the armature coil and a field current supplied from a DC source to the field coil, and charge at least a certain ratio of the field coil before starting the motor.