Rotary Electric Machine Field Slot Layout for Magnetic Force Control
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Solution Overview
Problem
Existing rotary electric machines, such as hybrid excitation flux switching motors, face challenges in efficiently controlling magnetic forces and torque across varying operational conditions, particularly in managing the magnetic states of field magnets and optimizing energy efficiency.
Innovation Solution
The rotary electric machine incorporates a stator with alternately arranged armature and field slots, featuring armature windings, field windings, and dual field magnets, where the field windings generate a flux to control the magnetic force of the first field magnet, allowing for switching between magnetized and demagnetized states, and the second field magnet provides a constant flux direction, enabling diverse operating modes and improved control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a field winding and permanent magnet are housed in the field slot to generate field flux, then the magnetic force control capability is improved, but the device complexity increases due to additional components and winding structures
Solution Approach 1:
The patent combines the field winding and permanent magnet into a single field slot structure, where the permanent magnet provides a base magnetic field and the field winding provides adjustable flux control. This merging allows both components to work together in one location rather than requiring separate structures, achieving effective magnetic control while managing device complexity.
Solution Approach 2:
The field slot structure serves multiple functions: it houses both the permanent magnet for base field generation and the field winding for adjustable flux control. This multi-functional design allows a single structural element to perform both permanent magnet motor and wound field motor functions, improving versatility without proportionally increasing complexity.
2Adaptability or versatility
If six distinct operating modes are enabled through field flux control, then the versatility and performance are improved, but the control system complexity increases
Solution Approach 1:
The patent enables dynamic switching between six operating modes by controlling the field winding current. The system can dynamically adjust the magnetic field characteristics to achieve different operating states (motoring, generating, regenerative braking, etc.), providing high versatility through controllable dynamics rather than fixed mechanical configurations.
Solution Approach 2:
The patent achieves multiple operating modes by changing electrical parameters (field current magnitude and direction) rather than mechanical parameters. By varying the field flux through electrical control, the system can transition between different operating states, reducing mechanical complexity while maintaining operational versatility.
3Use of energy by moving object
If the first field magnet is configured to change magnetic force by field flux, then the energy efficiency is improved through magnetic state switching, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs feedback control to monitor and adjust the field flux, ensuring precise control of the first field magnet's magnetic state. By using feedback from sensors and control circuits, the system can maintain accurate magnetic field conditions for optimal energy efficiency while compensating for manufacturing variations through active control.
Solution Approach 2:
The permanent magnet is pre-configured to provide a base magnetic field that establishes the initial magnetic state. This preliminary magnetic field reduces the amount of additional flux needed from the field winding, improving energy efficiency by reducing copper losses while allowing simpler control precision requirements for achieving the desired operating points.
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 allows for efficient control of magnetic forces and torque across different operational conditions, enhancing energy efficiency and enabling six distinct operating modes, thereby improving the versatility and performance of the rotary electric machine.
Implementation Method 1
The armature winding is configured to generate a rotating magnetic field to rotate the rotor by being supplied with an alternating-current armature current
Implementation Method 2
The field winding is configured to generate a field flux by being supplied with a direct-current field current
Implementation Method 3
The first field magnet is configured to change a magnetic force by the field flux
Data Source
AI summary
A rotary electric machine includes a rotor, and a stator facing the rotor with a predetermined gap interposed between the rotor and stator. The stator has a stator core formed in a substantially circular annular shape and provided with an armature slot and a field slot alternately arranged in a circumferential direction, an armature winding housed in the armature slot, and a field winding and a first field magnet housed in the field slot. The armature winding generates a rotating magnetic field to rotate the rotor by being supplied with an alternating current armature current. The field winding generates a field flux by being supplied with a direct current field current. The first field magnet changes a magnetic force by the field flux.