Double Stator Rotary Machine Torque Balance
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Solution Overview
Problem
The double stator-type rotary machine experiences inefficiency due to a significant difference in torque applied by the outer and inner stators, leading to degraded motor performance when high power output is required.
Innovation Solution
Incorporating permanent magnets on both sides of the rotor, allowing the outer stator to function as a switched reluctance motor and the inner stator as a permanent magnet motor, thereby balancing the torque applied to the rotor and enhancing motor efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a double stator structure is employed to improve the performance of a switched reluctance rotary machine, then the power output capability is improved, but a large difference occurs between the torque applied from the outer stator and the torque applied from the inner stator, degrading motor efficiency
Solution Approach 1:
The patent applies parameter changes by introducing permanent magnets to the inner stator, fundamentally altering the operational characteristics of the inner stator from switched reluctance mode to permanent magnet mode. This parameter change in the inner stator's magnetic field generation method enables it to produce higher torque density, thereby balancing the torque contribution between the outer and inner stators and improving overall motor efficiency while maintaining high power output capability
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 configuration increases motor efficiency by reducing the torque difference between the outer and inner stators, allowing for more effective power transmission and improved performance.
Implementation Method 1
permanent magnets are provided in a double stator-type rotary machine
Implementation Method 2
the inner side of the rotor can be operated as a permanent magnet (PM) motor
Implementation Method 3
a torque is applied to the rotor from both of the stators
Data Source
Figure 1
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Figure 3
AI summary
This double stator-type rotary machine is provided with: an annular rotor (2); an outer stator (3) that is disposed on the outer side of the rotor; and an inner stator (4) that is disposed on the inner side of the rotor (2). The rotor (2) is provided with permanent magnets (2d) that are arranged on the inner stator (4) side.