Variable Field Rotary Machine Rotor Core Adjustment
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Solution Overview
Problem
Conventional rotary electrical machines face challenges in achieving high torque at low rotational speeds while also maintaining high-speed rotation, as they either struggle with high torque at low speeds or high-speed rotation but not both, due to fixed field magnetic flux configurations.
Innovation Solution
A rotary electrical machine of a variable field type is designed with a rotor core that adjusts its angular position relative to the shaft using magnetic suction force, allowing the field magnetic flux to change in response to load torque, eliminating the need for a rotor phase control mechanism and maintaining a simplified construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the field magnetic flux is kept fixed, then the construction is simplified, but the machine cannot achieve both high torque at low speeds and high-speed rotation
Solution Approach 1:
The rotor core automatically adjusts its own angular position relative to the shaft in response to load torque changes, eliminating the need for external field control mechanisms. The magnetic suction force between the rotor core and shaft creates a self-regulating system where the rotor core naturally shifts to optimal positions for different operating conditions.
Solution Approach 2:
The rotor core is designed to be dynamically adjustable rather than fixed, allowing it to change its angular position relative to the shaft based on operating conditions. This dynamic adjustment enables the machine to adapt its field magnetic flux automatically, achieving both high torque at low speeds and high-speed rotation capability.
2Adaptability or versatility
If a rotor phase control mechanism is added to adjust field magnetic flux, then torque-speed performance improves, but the construction becomes complex
Solution Approach 1:
The rotor core automatically adjusts its own angular position relative to the shaft in response to load torque changes, eliminating the need for external field control mechanisms. The magnetic suction force between the rotor core and shaft creates a self-regulating system where the rotor core naturally shifts to optimal positions for different operating conditions.
Solution Approach 2:
The invention removes the complex rotor phase control mechanism entirely, extracting only the essential function needed for field magnetic flux adjustment. By allowing the rotor core to freely adjust its angular position without mechanical constraints or control systems, the patent achieves torque-speed adaptability through a much simpler configuration.
3Adaptability or versatility
If the rotor core is rigidly fixed to the shaft, then the construction is simplified, but the field magnetic flux cannot be adjusted in response to load torque
Solution Approach 1:
The rotor core is designed to be dynamically adjustable rather than fixed, allowing it to change its angular position relative to the shaft based on operating conditions. This dynamic adjustment enables the machine to adapt its field magnetic flux automatically, achieving both high torque at low speeds and high-speed rotation capability.
Solution Approach 2:
The rotor core automatically adjusts its own angular position relative to the shaft in response to load torque changes, eliminating the need for external field control mechanisms. The magnetic suction force between the rotor core and shaft creates a self-regulating system where the rotor core naturally shifts to optimal positions for different operating conditions.
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 enables high torque at low speeds and high-speed rotation simultaneously, while also achieving high efficiency across a range of torque levels by dynamically adjusting the field magnetic flux in response to load torque, thus overcoming the limitations of comparative examples with fixed field magnetic flux.
Implementation Method 1
The rotor core is held at a predetermined angular position with respect to the shaft with a magnetic suction force of the first permanent magnet
Implementation Method 2
to increase a relative angle with the shaft in response to an increase of a load torque against the magnetic suction force
Data Source
AI summary
This disclosure discloses a rotary electrical machine of a variable field type configured to change a field magnetic flux. The rotary electrical machine includes a stator including stator windings and a stator core, and a rotor including a shaft rotatably supported, a rotor core relatively rotatably mounted on the shaft, and a plurality of first permanent magnets disposed on the rotor core. The rotor core is configured to be held at a predetermined angular position with respect to the shaft with a magnetic suction force of the first permanent magnet, and to increase a relative angle with the shaft in response to an increase of a load torque against the magnetic suction force. The rotor core has an approximately same axial length as the stator core.