Spherical Stator Brushless Motor with Offset Poles
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Solution Overview
Problem
Existing electromagnetic devices, such as electric motors and generators, face issues with short lifespan, increased wear due to brush friction, complex design, magnet strength reduction, and low reliability, particularly in brushless DC motors where brushes wear out and toroidal magnets can be damaged, leading to weak magnetic fields and torque.
Innovation Solution
A brushless motor generator design featuring a rotor with a permanent magnet and a stator of spherical or ellipsoidal shape with windings forming 1 to 12 coils with uniformly offset poles, where the permanent magnet is positioned inside the stator, allowing for a stronger magnetic interaction and smoother rotation, reducing weight and size while maintaining torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brushes are used in electromagnetic devices, then electrical energy can be transmitted to the rotor, but the brushes wear out due to friction leading to short lifespan
Solution Approach 1:
The invention removes the brushes and collector from the electromagnetic device, eliminating the friction-based electrical connection between stator and rotor. Instead, a brushless design with permanent magnets on the rotor and electromagnetic coils on the stator is implemented, where electrical energy is transmitted through the magnetic field without physical contact, thereby eliminating brush wear and extending device lifespan.
Solution Approach 2:
The mechanical brush-collector system is replaced with an electromagnetic field-based energy transmission system. The rotor with permanent magnets interacts with the stator coils through magnetic coupling, allowing electrical energy to be transferred without mechanical contact, thus eliminating the harmful friction and wear of brushes.
2Device complexity
If toroidal magnets are used in brushless DC motors, then the design is simplified, but the magnets can be damaged at certain rotor turns causing destruction
Solution Approach 1:
Instead of using a single large toroidal magnet, the invention divides the magnetic system into multiple smaller permanent magnets distributed around the rotor circumference. This segmentation reduces the mechanical stress on each individual magnet during rotation and prevents catastrophic failure if one magnet is damaged, while maintaining the overall magnetic field required for motor operation.
Solution Approach 2:
The invention positions the permanent magnets and electromagnetic coils such that the magnetic field distribution is optimized to prevent excessive force concentrations on any single magnet. The geometric arrangement and magnetic pole configuration are designed beforehand to cushion and distribute mechanical stresses uniformly, preventing magnet damage at critical rotation points.
3Volume of moving object
If the stator diameter is large with small magnets, then the design is achieved, but the magnetic field is weak affecting torque strength
Solution Approach 1:
The invention optimizes the magnetic field interaction by arranging permanent magnets and electromagnetic coils in a three-dimensional configuration with specific geometric relationships. The magnets are positioned at calculated angular intervals and depths, creating a concentrated and uniform magnetic field in the air gap that maximizes torque production within a compact stator volume, effectively utilizing spatial dimensions to enhance magnetic field density.
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 enhances reliability, reduces weight and size, and ensures smoother rotor rotation with increased torque stability, outperforming previous designs by minimizing wear and maximizing magnetic field interaction.
Implementation Method 1
A brushless motor generator design featuring a rotor with a permanent magnet and a stator of spherical or ellipsoidal shape with windings forming 1 to 12 coils with uniformly offset poles, where the permanent magnet is positioned inside the stator, allowing for a stronger magnetic interaction
Implementation Method 2
The invention is intended to convert electrical energy into mechanical energy of rotation due to a magnetic field and vice versa, mechanical energy of rotation into electrical energy
Data Source
AI summary
The invention relates to electrical engineering, in particular to electromagnetic devices. Brushless motor generator is disclosed, which includes a rotor with a permanent magnet and a stator, the windings of which have a rounded cross-section. According to the invention, the rotor is made in the form of a shaft with a permanent magnet fixed on it. The magnetic field vector of the poles of the magnet is perpendicular to the axis of rotation of the shaft. The stator is spherical, covering the magnet, and the axis of symmetry of the stator coincides with the axis of rotation of the shaft. From 1 to 12 windings are wound on the outer spherical surface of the stator; the windings forming the coils with uniformly offset poles relative to each other.