Reconfigurable Synchronous Motor Pole Design for Wide-Speed Efficiency
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Solution Overview
Problem
Existing synchronous motor and generator systems face challenges in dynamically reconfiguring their pole and phase configurations, limiting their performance and efficiency, especially over a wide speed range.
Innovation Solution
Implementing a dynamically reconfigurable synchronous motor system with a rotor and stator design that includes phase windings, permanent and wound poles, and magnetic barriers to control magnetic reluctance, allowing for dynamic adjustment of pole and phase configurations using multi-harmonic field-oriented control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic reconfiguration technology is implemented in synchronous machines, then performance and efficiency are improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic reconfiguration of pole and phase configurations in synchronous machines by making the magnetic pole structure adjustable. The rotor contains both permanent magnet poles and wound poles with field windings, allowing the number of poles to be changed during operation by controlling the excitation current in the wound poles. This dynamic capability enables the motor to adapt to different operating conditions, improving performance and efficiency across varying speeds and loads.
2Force
If the number of poles is increased to improve torque density, then torque density improves, but the system size increases
Solution Approach 1:
The patent changes the parameter of pole number dynamically to optimize torque density. By using a combination of permanent magnet poles and wound poles with controllable field windings, the system can adjust the effective number of poles based on operating conditions. This allows high torque density to be achieved when needed without permanently increasing the physical size of the motor, as the pole configuration is variable rather than fixed.
3Loss of energy
If dynamic reconfiguration is implemented to optimize performance over wide speed range, then efficiency improves, but control complexity increases
Solution Approach 1:
The patent employs dynamic reconfiguration of pole and phase configurations to optimize efficiency across a wide speed range. The control system adjusts the excitation current in the wound poles to change the pole configuration dynamically, and simultaneously adjusts the stator winding connections to maintain proper phase relationships. This dynamic adaptation allows the motor to operate efficiently at both low and high speeds by selecting appropriate pole configurations.
Solution Approach 2:
The patent changes multiple parameters simultaneously - pole number, phase configuration, and excitation current - to optimize efficiency. By dynamically adjusting these parameters based on operating conditions, the system maintains high efficiency across the entire speed range rather than being optimized for a single operating point.
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
Enhances torque and power density, improves efficiency, and reduces system size and cost by enabling seamless transitions between different pole configurations, optimizing performance across varying speeds and loads.
Implementation Method 1
a plurality of phase windings is located in the stator and configured to generate a first magnetic field in the air gap
Implementation Method 2
The rotor contains a group of permanent magnet poles and a group of wound poles which are configured to generate a second magnetic field in the air gap
Implementation Method 3
a d-axis magnetic reluctance barrier is placed in or around the body so a d-axis magnetic reluctance of a wound pole is approximately the same as that of one of the permanent poles
Data Source
AI summary
An apparatus has a rotor magnetically coupled to a stator through an air gap, and a plurality of phase windings is located in the stator and configured to generate a first magnetic field in the air gap. The rotor contains a group of permanent magnet poles and a group of wound poles which are configured to generate a second magnetic field in the air gap. Each wound pole has a field winding around its body and a d-axis magnetic reluctance barrier is placed in or around the body so a d-axis magnetic reluctance of a wound pole is approximately the same as that of one of the permanent poles.