Rectified Rotor Windings for Synchronous Power Transfer
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Solution Overview
Problem
Existing electric motors and generators face challenges in efficiently transferring power and maintaining synchronicity between the stator and rotor without relying on rare-earth magnets, brushes, or exciter circuits, while also experiencing torque ripple issues.
Innovation Solution
The implementation of a rectified rotor with windings that include a rectifier, such as a diode, and a controller that adjusts current angle and magnitude in response to operating conditions, ensuring synchronicity and reducing torque ripple by controlling the current flow direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional electric motors use rare-earth magnets, brushes, or exciter circuits to transfer power and maintain synchronicity, then power transfer efficiency is improved, but device complexity and reliance on expensive materials increase
Solution Approach 1:
The patent removes rare-earth magnets, brushes, and exciter circuits from the motor structure, extracting the problematic components that cause complexity and material dependency while maintaining power transfer functionality through alternative means
Solution Approach 2:
The patent replaces mechanical power transfer mechanisms (brushes, commutators) with electromagnetic field-based power transfer through rectified rotor windings, eliminating mechanical contact and associated complexity
2Power
If traditional motors use brushes and commutators for power transfer, then power delivery is achieved, but torque ripple and mechanical wear increase
Solution Approach 1:
The patent replaces mechanical brushes and commutators with a rectified rotor winding system that uses electromagnetic induction and rectification to achieve power transfer, eliminating mechanical contact that causes torque ripple and wear
Solution Approach 2:
The patent changes the electrical parameters by introducing rectified windings that convert AC to DC, fundamentally altering how power is delivered to the rotor and eliminating the torque ripple associated with traditional AC commutation
3Device complexity
If rectified rotor windings are implemented without controller adjustment, then power transfer is simplified, but synchronicity maintenance and torque ripple control deteriorate
Solution Approach 1:
The patent implements a controller that monitors operating conditions and adjusts current angle and magnitude in real-time, using feedback to maintain synchronicity between stator and rotor fields while optimizing torque ripple control
Solution Approach 2:
The patent makes the system dynamically adaptive by allowing the controller to adjust electrical parameters (current angle, magnitude) based on operating conditions, enabling the motor to maintain optimal performance across varying loads and speeds
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 enables efficient power transfer and reduced torque ripple in electric machines, eliminating the need for rare-earth magnets and brush or exciter circuits, while maintaining synchronicity between the stator and rotor.
Implementation Method 1
The rotor defines multiple fixed rotor poles with associated rotor windings that include a rectifier
Implementation Method 2
Electric current is translated into electromagnetic fields which exert a mechanical force, or torque, between the stator and the rotor
Implementation Method 3
The rotor is maintained in synchronicity with the magnetic fields produced by the stator windings during operation
Data Source
AI summary
An electric machine includes a stator defining multiple stator poles with associated stator windings configured to receive a stator current. The electric machine also includes a rotor defining multiple fixed rotor poles with associated rotor windings, wherein the rotor defines a field energizable by magnetic fields produced by the stator windings when receiving the stator current to produce relative motion between the rotor and the stator and wherein the rotor is maintained in synchronicity with the magnetic fields produced by the stator during operation of the electric machine. The electric machine also includes a rectification system configured control against an alternating current being induced in the rotor poles as the field is energized by magnetic fields produced by the stator windings when receiving the stator current.