Patent Application
20080150387
1. Field of the Invention
The present invention relates to a rotatable device, and more particularity to a rotatable magnetic device that uses repelling magnetic forces to rotate a shaft in the rotatable magnetic device so that the shaft can be rotated without applying an external force.
2. Description of Related Art
A conventional rotatable device such as generators in accordance with the prior art has a housing, a stator, a shaft, a rotor, a coil and a commutator.
The housing is hollow and has an inner wall.
The stator has multiple permanent magnets. Each permanent magnet is mounted on the inner wall of the housing and has a magnetic field.
The shaft is mounted coaxially and rotatably in the housing and has an end and is rotated by an external force.
The rotor is mounted around the shaft and has an outer surface.
The coil is wound on the outer surface of the rotor and passes through the magnet fields of the permanent magnets when the shaft rotates.
The commutator is mounted on the end of the shaft, is connected to the coil and has multiple brushes. The brushes are mounted on the commutator and picks up and rectifies current generated in the coil when the shaft rotates.
When the external force stops acting on the shaft, the shaft stops rotating, and the rotatable device stops function or generating electricity. Furthermore, another power source is required to generate the external force needed to rotate the shaft, and the generator is not perfectly efficient so some of the other power source is wasted.
To overcome the shortcomings, the present invention provides a rotatable magnetic device to obviate or mitigate the aforementioned problems.
The primary objective of the present invention is to provide a rotatable magnetic device that uses repelling magnetic forces to rotate a shaft in the rotatable magnetic device so no external force is required to rotate the shaft.
The rotatable magnetic device has a housing, a shaft, a stator, a rotor and a cord. The housing is hollow and has an inner wall. The shaft is mounted rotatably and coaxially in the housing. The stator is mounted on the inner wall of the housing and has a polarity. The rotor is mounted on the shaft and has a polarity that causes the repelling magnetic force from the stator to rotate the rotor, which drives the shaft to rotate simultaneously.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
The housing (10,60) is hollow and has an inner wall.
The stator (20, 61) has multiple magnetic pieces (21). Each magnetic piece (21) may be a permanent magnet or a temporary magnet and rectangle-shape and is mounted on the inner wall of the housing (10, 60) and has a side wall and a polarity and magnetic field.
The shaft (30, 63) is mounted coaxially and rotatably in the housing (10)(60) and has an end and a side and a center.
With further reference to
The coil (22) is wounded on the side walls of the magnetic pieces (21) of the stator (20, 61) and may be connected to a power source and increase the magnetic fields of the magnetic pieces (21) of the stator (20, 61).
The coil (42) is coiled on the side walls of the magnetic pieces (41) of the rotor (40, 62) and may be connected to a power source and increase the magnetic fields of the magnetic pieces (41) of the rotor (40, 62).
The rings (64) are mounted around the end of the shaft (63).
The commutator (51)(65) may be a band and is mounted around the end of the shaft (30)(63) and may have a side and wires. The wires are connected the commutator (65) and the rings (64).
The cord (50, 70) is mounted on the side of the shaft (30, 63) and between the magnetic pieces (41) of the rotor (40, 62) and may be connected to the commutator (51) or the rings (64).
The brushes (52) are mounted on the side of the commutator (51, 65) and picks up and rectifies current generated in the cord (50, 70) when the shaft (30, 63) rotates.
Due to the polarity repelling between the stator (20, 61) and the rotor (40, 62), the repelling force from the stator (20, 61) to the rotor (40, 62) drives the rotor (40, 62) to rotate, which drives the shaft (30, 63) to rotate simultaneously.
During the rotation, the magnetic fields between the stator (20, 61) and the rotor (40, 62) make the cord (50, 70) to generate the current or others. The current will transmit to the commutator (51) or the rings (64). The rings (64) will pass the electricity to the commutator (65). The brushes (52) pick up and rectifies the current. The current can be used or saved in the battery. Part of the current will transmit back to the rotor (40, 62) or the stator (20, 61) to increase the magnetic fields of the rotor (40, 62) or the stator (20, 61) to accelerate the rotation of the shaft (30, 63) so that the rotatable magnetic device may generate more current or speed up some device that connects to the rotatable magnetic device.
From structures described above, the rotation of the shaft (30, 63) depends on the magnetic repelling of the stator (20, 61) and the rotor (40, 62) so that the shaft (30, 63) may rotate without an external force. Because no external force is required so that no power source is wasted during the shaft (30, 63) rotates. Furthermore, the rotatable magnetic device may be widely used in a continued rotation device such as a generator, traffic devices or household appliances.
Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description together with details of the structure and function of the invention, the disclosure is illustrative only. Changes may be made in detail especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
