Dual-Purpose Stator Winding for BLDC Motor Energy Recovery
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Solution Overview
Problem
Conventional brushless DC (BLDC) motors do not fully utilize their potential to generate electrical energy while operating as motors, as they require additional prime moving forces for energy generation, leading to inefficiencies and wasted energy opportunities.
Innovation Solution
A dual-purpose stator assembly is designed for BLDC motors, with one segment of windings dedicated to producing torque and another to generating electrical energy, optimizing the placement of windings to maximize efficiency and reduce back-EMF, allowing for simultaneous motor operation and electrical energy generation without external prime moving forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional BLDC motors operate as motors only, then motor function is achieved, but electrical energy generation capability is lost
Solution Approach 1:
The stator winding assembly is designed to perform dual functions: producing torque in the rotor and generating electrical energy output. The same stator structure serves both motor operation and electrical energy generation, eliminating the need for separate generator components.
Solution Approach 2:
The stator winding assembly is divided into two distinct segments: a first set of windings configured to produce torque and a second set of windings configured to generate electrical energy. This segmentation allows independent optimization of each function while sharing the same stator structure.
2Use of energy by moving object
If additional prime moving forces are added for energy generation, then electrical energy can be generated, but system efficiency decreases
Solution Approach 1:
The BLDC motor generates electrical energy from its own operating magnetic field and rotor motion without requiring external prime moving forces. The motor's normal operation creates the conditions necessary for energy generation, making the system self-sufficient and eliminating additional mechanical components.
Solution Approach 2:
The motor function and generator function are merged into a single integrated system. The rotor's magnetic field and motion serve dual purposes: producing mechanical torque and inducing electrical energy in the stator windings, eliminating the need for separate prime moving force systems.
3Power
If windings are placed closer to the rotor for energy generation, then electrical energy output increases, but back-EMF increases
Solution Approach 1:
The stator winding assembly is segmented into two functionally distinct sets: torque-producing windings positioned to optimize motor function and energy-generating windings positioned to maximize electrical output. This segmentation allows the energy-generating windings to be placed closer to the rotor for higher output without compromising motor performance.
Solution Approach 2:
Different regions of the stator assembly have different winding configurations optimized for their specific functions. The energy-generating windings are locally positioned closer to the rotor where magnetic flux density is highest, while torque-producing windings are positioned for optimal motor operation, allowing each region to perform its function with maximum efficiency.
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 solution achieves an efficiency of 90-95%, enabling BLDC motors to generate 50% or more of the input electrical energy during motor operation, extending the drive range of electric vehicles by harnessing and storing generated energy.
Implementation Method 1
To generate torque, commutation methods of BLDC motors are accomplished through electromagnetic excitation by energizing the stator winding assembly
Implementation Method 2
as a byproduct of the energy expended to produce torque in the rotor, it also generates electrical energy known as back electromotive force (back—EMF)
Data Source
AI summary
A brushless direct current (BLDC) motor that generates electrical energy (AC voltage) while operating as a motor. The motor is configured with a dual purpose stator assembly wherein one segment of the stator assembly includes coil windings to produce the rotary force (torque) in the rotor and the other segment of the stator assembly includes coil windings to generate electrical energy. The stator windings for producing torque are electrically connected through commutation control circuitry to a DC supply source, and the stator windings for generating electrical energy are connected to a load or to an energy storage system. Thus, the embodiment offers a novel means for generating electrical energy in the conventional BLDC motors. Because the motor can generate electrical energy while operating as a motor, it can effectively serve as a powertrain in electric vehicles, whereby the electrical energy it generates can be used to extend the vehicles' drive range.