Reconfigurable Synchronous Motor Pole Switching Across Wide Speed Ranges
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Solution Overview
Problem
Existing technologies face challenges in dynamically reconfiguring synchronous motors to improve power and torque density and efficiency over a wide speed range, particularly in applications requiring high performance.
Innovation Solution
A motor system with dynamically adjustable pole and phase configurations, utilizing a rotor-stator setup with phase windings coupled to inverters, allows for dynamic adjustment of magnetic fields by controlling currents in phase windings, merging reversible and unchanged poles to change the pole number, and employing multi-harmonic field-oriented control for synchronized pole adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If dynamic reconfiguration technology is applied to synchronous motors, then power density and torque density are improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic reconfiguration of the synchronous motor by enabling the pole number to be changed during operation. The motor can switch between different pole configurations (e.g., 4-pole, 6-pole, 8-pole) through controlled switching of phase windings, allowing the motor to adapt to different load and speed requirements dynamically. This dynamic capability resolves the contradiction by enabling high power density through optimal pole selection while managing complexity through structured control architecture.
Solution Approach 2:
The motor design incorporates multi-functional capability by integrating multiple pole configurations within a single motor structure. The same motor can operate in different modes (4-pole for high speed, 6-pole for medium speed, 8-pole for low speed) without requiring separate motors for each application, thereby improving power density across wide operating ranges while avoiding the complexity of multiple separate motor systems.
2Loss of energy
If dynamic reconfiguration technology is applied to synchronous motors, then efficiency is improved, but device complexity increases
Solution Approach 1:
The motor system dynamically adjusts pole configuration based on operating conditions to optimize efficiency. By switching between 4-pole, 6-pole, and 8-pole modes, the motor can operate at optimal efficiency points across different speed and load ranges, reducing energy losses. The control system monitors operating conditions and selects the most efficient pole configuration, resolving the contradiction between improved efficiency and increased complexity through intelligent dynamic adaptation.
3Adaptability or versatility
If pole number is dynamically adjusted, then adaptability is improved, but device complexity increases
Solution Approach 1:
The motor implements dynamic pole switching capability, allowing it to adapt to different operating requirements by changing pole configuration during operation. The system can transition between 4-pole, 6-pole, and 8-pole modes based on load and speed demands, significantly improving adaptability. The controlled complexity is managed through structured phase winding arrangements and coordinated control strategies.
Solution Approach 2:
The motor windings are segmented into multiple independent phase groups that can be selectively activated. By dividing the winding system into controllable segments, the motor can independently configure different pole numbers through selective connection of phase groups, improving adaptability while organizing complexity through modular segmentation of the electrical system.
4Productivity
If multi-harmonic field-oriented control is used, then productivity is improved, but device complexity increases
Solution Approach 1:
The control system implements multi-harmonic field-oriented control with feedback mechanisms that monitor motor operating conditions and adjust control parameters accordingly. The feedback loop enables real-time optimization of torque and speed control across different pole configurations, improving productivity through precise control while managing complexity through systematic feedback architecture.
Solution Approach 2:
The control system dynamically changes multiple parameters including pole number, switching frequency, and current harmonics to optimize motor performance. By coordinating changes in these parameters through multi-harmonic control strategies, the system achieves high productivity across varying operating conditions while organizing complexity through parameter-based control methodology.
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 motor performance by improving power and torque density, efficiency, and reducing costs through dynamic reconfiguration of synchronous motors, enabling high performance across varying speed ranges.
Implementation Method 1
a plurality of phase windings configured to be coupled to a plurality of inverters and generate a first magnetic field
Implementation Method 2
a plurality of poles configured to generate a second magnetic field in the air gap... each reversible pole has a field winding around a pole body, where a polarity of each reversible pole is configured to be changed
Implementation Method 3
a rotor magnetically coupled to a stator through an air gap
Data Source
AI summary
An apparatus has a plurality of poles facing an air gap, and the poles are configured to generate a magnetic field in the air gap. The poles include a group of unchanged poles and a group of reversible poles, where a polarity of each reversible pole is configured to be changed during an operation mode, and after the polarity has been changed, each reversible pole and at least an adjacent unchanged pole in effect merged into one augmented pole, such that the pole number of the magnetic field in the air gap is changed.