Dual-Stator Induction Motor Layout for Higher Torque Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional induction motors with a single stator face limitations in torque and output due to unilateral magnetic flux flow, and existing methods to improve heat dissipation and fill factor have limitations in enhancing motor performance.
Innovation Solution
A hybrid induction motor design featuring dual stators arranged inside and outside a hollow rotor with a single conductor bar, where the outer and inner stators have windings disposed parallel to the rotor's surfaces, and phase shift control between the stators to reduce harmonics and torque ripple.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single stator is used in the conventional induction motor, then the structure is simple, but the torque and output are limited due to unilateral magnetic flux flow
Solution Approach 1:
The stator is divided into two separate stators (inner stator and outer stator) that are positioned on opposite sides of the rotor. Each stator has its own winding and independently generates magnetic flux that flows through the rotor, enabling dual-directional magnetic flux flow and significantly improving torque and output while maintaining manufacturing simplicity
Solution Approach 2:
The magnetic flux flow is extended from a single direction (unilateral) to two directions (bilateral) by adding the inner stator. This dimensional change in magnetic flux path allows the rotor to be magnetized from both sides, effectively doubling the magnetic interaction and improving motor performance without complicating the basic structure
2Temperature
If cooling system is used to suppress temperature rise, then heat dissipation improves, but armature current and current density increase leading to higher copper loss
Solution Approach 1:
The cooling function is segmented from the main motor structure and implemented as a separate cooling passage system. The cooling passages are formed between the inner and outer stators and extend in the axial direction, allowing coolant to flow through and cool the armature windings and core without affecting the electrical parameters or causing increased copper loss
Solution Approach 2:
A coolant is introduced as an intermediary substance to transfer heat away from the armature windings and core. The cooling passages allow the coolant to flow through the motor structure, absorbing heat and carrying it away, thereby suppressing temperature rise without requiring increased armature current or current density
3Power
If the fill factor of armature windings is improved, then armature resistance decreases and torque increases, but the structural complexity increases
Solution Approach 1:
The armature windings are divided into two separate sets: inner armature windings on the inner stator and outer armature windings on the outer stator. Each winding set can be independently designed and optimized, allowing for improved fill factors and reduced armature resistance without requiring complex single-winding structures. The segmented approach simplifies the manufacturing process while achieving the desired performance improvements
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 hybrid induction motor achieves improved torque and output density, reduced harmonics and torque ripple, and enhanced vibration and noise characteristics, while maintaining manufacturing simplicity and efficiency through dual stator arrangement and phase control.
Implementation Method 1
the stator includes a stator core and stator windings... the hollow rotor includes, besides the conductor bar, a rotor core... magnetic flux flows unilaterally into the conductor bar
Data Source
AI summary
The present disclosure in some embodiment provides a hybrid induction motor including dual stators. According to at least one embodiment, the present disclosure provides a hybrid induction motor including a hollow rotor including a single conductor bar which is annularly disposed and spaced apart from a rotation axis by a predetermined distance, an outer stator having an outer stator winding disposed in parallel with an outer circumferential surface of the hollow rotor, and an inner stator having an inner stator winding disposed in parallel with an inner circumferential surface of the hollow rotor.