Motor-Generator Feedback Windings for Lower Current Draw
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Solution Overview
Problem
Conventional induction motors are inefficient in energy consumption and power generation, leading to high energy costs and limited practical applications as generators due to significant losses and inadequate power output.
Innovation Solution
An energy-efficient motor-generator design featuring a stator with additional windings and an electronic control unit that harvests and feeds back induced EMF to reduce current consumption and generate power for both motor operation and electrical loads, utilizing a rotating magnetic field to induce EMF in multiple windings for efficient energy utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional induction motors are used, then motor operation is achieved, but energy consumption is excessive and efficiency is low
Solution Approach 1:
The patent implements a feedback mechanism where EMF generated in the rotor is fed back to the stator winding through a feedback winding. This feedback EMF reduces the current required from the external power supply, thereby reducing energy consumption and improving overall efficiency. The feedback loop creates a self-regulating system that recycles energy within the motor structure.
Solution Approach 2:
The patent recovers energy that would otherwise be lost as wasted EMF in conventional motors. By capturing the EMF generated in the rotor during normal operation and feeding it back to the stator, the system recovers and reuses energy, transforming what would be discarded energy into useful work that reduces external power requirements.
2Loss of energy
If induction motors are designed for higher efficiency, then energy consumption reduces, but device complexity increases due to additional windings and control units
Solution Approach 1:
The patent makes the motor structure multi-functional by enabling it to both consume electrical energy for motor operation and generate electrical energy through the feedback mechanism. The same motor structure serves dual purposes: as a conventional motor and as a self-regulating energy recovery system, reducing the need for separate energy management devices.
Solution Approach 2:
The patent merges the motor function with the generator function in a single integrated structure. The stator and rotor windings serve both motor operation and energy generation/feedback functions simultaneously, combining what would traditionally be separate systems into one unified device that improves efficiency without proportionally increasing complexity.
3Power
If additional windings are added to the stator, then power generation capability improves, but manufacturing complexity and cost increase
Solution Approach 1:
The patent segments the stator windings into distinct functional groups: main windings for motor operation, feedback windings for energy recovery, and load windings for power generation. This segmentation allows each winding type to be optimized for its specific function while maintaining a modular structure that can be manufactured using standardized processes, reducing overall manufacturing complexity despite the increased number of windings.
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
The design significantly reduces electricity consumption, enhances power efficiency, and enables the motor-generator to efficiently supply power to electrical loads, making it suitable for industrial applications while minimizing mechanical and electrical losses.
Implementation Method 1
When the stator winding of the induction motor is fed with an AC input power supply, alternating flux is produced around the stator winding due to the AC input power supply. This alternating flux revolves with synchronous speed. The revolving flux is referred to as the 'Rotating Magnetic Field' (RMF). The relative speed between the stator RMF and rotor conductors causes an induced electromotive force (EMF) in the rotor conductors, in accordance with Faraday's law of electromagnetic induction.
Implementation Method 2
The relative speed between the stator RMF and rotor conductors causes an induced electromotive force (EMF) in the rotor conductors, in accordance with Faraday's law of electromagnetic induction. The rotor conductors are short circuited, and hence rotor current is produced due to the induced EMF. The induced current in the rotor also produces an alternating flux around it.
Implementation Method 3
The direction of the induced rotor current, according to Lenz's law, is such that it will tend to oppose the cause of its production. As the cause of production of the rotor current is the relative velocity between the rotating stator flux and the rotor, the rotor will try to catch up with the stator RMF.
Data Source
AI summary
The disclosure relates to an energy efficient motor-generator which includes a stator, a main winding (M) of the stator for generating a rotating magnetic field (RMF), and a rotor disposed to rotate relative to the main winding (M) of the stator due to the RMF. The stator further includes a first additional winding (F) for producing an alternating EMF and a second additional winding (E) for producing a corresponding alternating EMF due to the rotation of the rotor. The two alternating EMFs are harvested through an electronic control unit (ECU) interfaced to the stator for continuously supplying power for the working of the motor-generator and for supplying power to drive electrical loads, respectively.