Double-Rotor Machine Induction Torque Without Magnets
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Solution Overview
Problem
Existing double-rotor electrical rotating machines face efficiency drops due to energy conversion losses and complex, costly constructions requiring rare permanent magnets or electromagnets with additional components like slip rings.
Innovation Solution
A double-rotor electrical rotating machine design featuring a stator with armature pole coils, a first rotor with salient poles wound by induction coils, and a second rotor with permeable and non-permeable materials along its periphery, allowing magnetic flux to induce current without permanent magnets, using reluctance and magnetic torque for rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If permanent magnets are used in the rotor to provide big output or big torque with compact construction, then the output or torque is improved, but the cost increases due to using rare and precious permanent magnets such as neodymium magnets
Solution Approach 1:
The patent extracts and removes the permanent magnets from the rotor structure, replacing them with a stator-based electromagnetic field generation system. This eliminates the need for rare and precious permanent magnets while maintaining the ability to generate big output or torque through electromagnetic induction in the rotor coils.
Solution Approach 2:
The patent substitutes the magnetic field generation mechanism from permanent magnets (mechanical/magnetic material) to electromagnetic coils energized by electrical power. This replacement uses electromagnetism instead of permanent magnetic materials, reducing cost while maintaining power output capability.
2Power
If electromagnets are used in place of permanent magnets and electric power is supplied to the electromagnets on the rotor side, then the power output is maintained, but the construction becomes complicated requiring slip rings or the like for supply of electric power to coils and an inverter, resulting in cost increase
Solution Approach 1:
The patent inverts the traditional motor structure by placing the electromagnetic coils on the rotor side and the armature structure on the stator side. This allows the rotor coils to be energized through electromagnetic induction from the stator armature, eliminating the need for slip rings or external power supply to the rotor while maintaining electromagnet functionality.
Solution Approach 2:
The rotor coils generate their own magnetic field through induced current from the stator armature magnetic flux, rather than requiring external power supply through slip rings. The system uses the magnetic flux passing through the rotor to induce current that energizes the rotor coils, creating a self-sustaining electromagnetic interaction.
3Adaptability or versatility
If energy conversion from mechanical energy to electrical energy is required in the power transmission path, then the system can function as a range extender, but massive conversion losses occur and energy transmission efficiency drops
Solution Approach 1:
The patent designs the double-rotor electrical rotating machine to function in multiple modes including motor operation and generator operation for range extender applications. The machine can convert mechanical energy to electrical energy when needed, providing versatility while minimizing conversion losses through its efficient electromagnetic design with dual rotors and induction-based power transfer.
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 design results in a simple, cost-effective electrical rotating machine with minimal efficiency drop, rotating both rotors efficiently without permanent magnets and reducing component complexity, enabling effective torque generation and energy transmission.
Implementation Method 1
a stator (10) including armature pole coils (14) capable of generating magnetic flux when energized; a first rotor (30) driven to rotate when the magnetic flux passes therethrough; and a second rotor (20) driven to rotate in a magnetic path of the magnetic flux that passes through the first rotor
Implementation Method 2
the first rotor (30) includes a plurality of salient poles (32) situated along the periphery of the first rotor and wound by induction coils (34) which induce induced current when linked by the magnetic flux generated by the armature pole coils (14)
Implementation Method 3
the second rotor (20) includes portions of different materials, in permeability, which are situated along the periphery of the second rotor
Data Source
AI summary
An electrical rotating machine comprises: a stator including armature pole coils 14 capable of generating magnetic flux when energized; an inner rotor driven to rotate when the magnetic flux passes therethough; and an outer rotor in a magnetic path of the magnetic flux that passes through the first rotor, the outer rotor having portions of different materials, in permeability, which are situated along the periphery of the outer rotor, the inner rotor having a plurality of salient poles situated along the periphery of the inner rotor and wound by wound coils 34 which induce induced current when linked by the magnetic flux generated by the armature pole coils.