Permanent Magnet Motor Control Using Repulsive Flux Pulses
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electric motors with permanent magnets are limited by the current understanding of magnetism, necessitating improved designs for increased performance, efficiency, and versatility to meet global environmental and technological demands.
Innovation Solution
An electric motor design featuring a mobile component with permanent magnets and a stator with ferromagnetic cores and coils, controlled by a magnetic position control system that generates repulsive magnetic flux to manage attraction forces, allowing precise control of rotor movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional electric motors with permanent magnets are used, then the motor structure is simple and easy to manufacture, but the performance, efficiency, and versatility are limited by current understanding of magnetism
Solution Approach 1:
The patent changes the fundamental operating parameters of the motor by switching from attraction-based force generation to repulsion-based force generation. This involves changing the magnetic polarity configuration and the timing of coil energization, allowing the motor to overcome the limitations of conventional designs and achieve higher performance while maintaining manufacturing simplicity
Solution Approach 2:
The patent inverts the conventional approach by using repulsive forces instead of attractive forces to drive the rotor. Instead of attracting the rotor toward the stator, the stator poles are configured to repel the rotor magnets, fundamentally changing the force generation mechanism to achieve superior performance
2Ease of operation
If repulsive magnetic flux is generated to cancel attraction forces, then precise control of movement is achieved, but the device complexity increases due to the magnetic position control system
Solution Approach 1:
The patent implements a magnetic position control system that continuously monitors the rotor's magnetic position and uses this feedback information to control the timing and magnitude of electric pulses delivered to the stator coils. This closed-loop control enables precise movement control while managing the complexity through systematic feedback mechanisms
Solution Approach 2:
The patent replaces complex mechanical positioning and control mechanisms with a magnetic-based control system. Instead of using mechanical sensors, linkages, or actuators to control rotor position, the system uses magnetic field interactions and electrical pulse timing to achieve precise control, reducing mechanical complexity
3Power
If electric pulses are delivered to generate repulsive magnetic flux, then high rotational speeds and torque are achieved, but energy input and heat generation increase
Solution Approach 1:
The patent uses periodic delivery of electric pulses to the stator coils, synchronized with the rotor's magnetic position. By delivering pulses only at the appropriate moments in the rotation cycle and de-energizing coils when not needed, the system achieves high power output while minimizing continuous energy consumption and reducing heat generation from constant current flow
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 design enables efficient, versatile, and performant electric motors capable of self-starting, speed control, and dynamic braking with minimal energy input, suitable for various applications including HVAC systems and transportation.
Implementation Method 1
controllably deliver an electric pulse to the coil of each at least one stator pole to generate a repulsive magnetic flux on the ferromagnetic core
Implementation Method 2
the ferromagnetic core being naturally attracted to the at least one permanent magnet
Data Source
AI summary
Electric motors and methods of controlling electric motors are described herein. The electric motors include a mobile component having at least one permanent magnet coupled thereto and a stator spaced apart from the mobile component. The stator includes at least one stator pole having a ferromagnetic core and a coil wrapped around the ferromagnetic core. The ferromagnetic core is naturally attracted to the at least one permanent magnet. The motors also include a magnetic position control system configured to monitor a position of the at least one permanent magnet relative to the stator and controllably deliver an electric pulse to the coil of each stator pole to generate a repulsive magnetic flux on the ferromagnetic core to cancel an attraction force between the ferromagnetic core and the at least one permanent magnet to control movement of the mobile component.