Technical Field

The invention relates to a magnetic device for adjusting the driving torque which will be used with an electric motor, a thermic motor or any other motor. Background Art

The patent RO 119158 discloses a magnetic mechanism for the transmission and amplification of the magnetic torque, consisting in an assembly having a disk on which are provided some permanent magnets, as well a sub-assembly provided on its circumference with permanent magnets, the two sub-assemblies being placed on a primary shaft, which is placed on some axial bearings, a subassembly having a disk provided with some permanent magnets on its surface and which is placed on a secondary shaft which is perpendicular to the primary shaft and which is placed on radial axial bearings.

This mechanism has the advantage that it lacks direct transmission using a primary transmission, a secondary transmission and a magnetic transmission; also, the amplification of the driving torque with this device leads implicitly to an increase of consumption on the primary shaft.

Disclosure of Invention

The objective of this invention is to overcome the disadvantages of the solutions of the state of the art.

This objective is reached with the magnetic device for adjusting the driving torque as shown in the appended claim 1. The device according to the invention consists from at least a stator provided with at least one circular row of recesses in which are placed permanent magnets N-S radially polarized, in a sequence N-S, N-S or S-N, S-N, with inclination angles ranging between 18° and 55° relative to the corresponding radii of a shaft on which is mounted at least one rotor, the rotor having at least two arms, placed radially symmetric, each arm having recesses in which are placed permanent magnets with N-S radial polarization, in a sequence N-S, N-S or S-N, S-N, in a radial symmetric arrangement in relation to the mentioned shaft, in circular arcs with inclination angles ranging between 18° and 55° relative to the corresponding radii, both the permanent magnets of the stator and those of the rotor being provided with some magnetic shields.

In a preferred embodiment, the stator is configured with at least two circular concentric rows of recesses in which are placed permanent magnets N-S radially polarized, in a sequence N-S, N-S or S-N, S-N.

In another preferred embodiment, the rotor consists of three arms disposed radially symmetric, each arm being provided with recesses in which are placed N-S radially polarized permanent magnets, in a sequence N-S, N-S or S-N, S-N, radially symmetric to the mentioned shaft.

In another preferred embodiment, the rotor is configured as a drum with five arched symmetrically radial arms, each arm being provided with recesses in which are placed N-S radially polarized permanent magnets, in a sequence N-S, N-S or S-N, S-N, radially symmetric to the mentioned shaft.

It is an object of the present invention, the use of the magnetic device for adjusting the driving torque in a wind turbine.

The advantages of the device according to the present invention are obvious:

- the possibility to place the device on any type of driving group, it does not require a primary, secondary or elastic transmission, so it can be placed directly on the propeller's shaft or on the driving group;

- the device according to the present invention reduces the low kinetic value time, with applications for wind turbines, hydrokinetic turbines, etc.;

- high applicability due to its direct placement on the primary shaft, secondary transmission groups not being necessary anymore.

Brief Description of Drawings

Other objectives, advantages and preferred characteristics will be more evident from the following detailed description of the preferred embodiments of the magnetic device for adjusting the driving torque according to the invention, given to illustrate and not to be limitative, in relation to the appended drawings where: - Fig. 1 and Fig. 2 represent a perspective view and respectively a cross- section of a first embodiment of the magnetic device for adjusting the driving torque, in the three arm rotor variant;

- Fig. 3 represents details of the disposition of the polarized permanent magnets and of the magnetic screen of ferro-magnetic material in the stator and rotor of the magnetic device for adjusting the driving torque;

- Fig. 4 presents a schematic example of placement of the magnetic device for adjusting the driving torque on the shaft of an electric motor;

- Fig. 5 presents a schematic example of placement of the magnetic device for adjusting the driving torque in a wind turbine;

- Fig. 6 shows a second embodiment of the magnetic device for adjusting the driving torque in the circulary placed five arm rotor variant;

- Fig. 7 shows a simulation of the interactions of the magnetic fields having as result a kinetic impulse.

Modes for Carrying Out the Invention

Referring to the appended fig. 1 , the magnetic device according to the present invention converts the repulsive magnetic energy of the permanent magnets in kinetic impulses in the rotation sense of the rotor (2) because the stator (1) is provided with recesses in which are placed radially symmetric N-S radially polarized cylindrical permanent magnets (4), in a sequence N-S, N-S or S-N, S-N, at angles between 18° and 55°, for example at a 50° angle, relative to the corresponding radii.

The rotor (2) is built, according to the invention, from a drum provided in this embodiment with three radially symmetric arms, in which are placed radially symmetric N-S polarized cylindrical permanent magnets, in a sequence N-S, N-S or S-N, S-N shielded with the magnetic screens (5) on three of the faces of the permanent magnets of the rotor.

The shaft (3) is provided with bearings (6), some of them being attached to the rotor (2) by pressing and the other ones being attached to the stator (1).

In another embodiment of the device according to the invention, in relation to fig. 6, the stator 1 is provided with recesses in which are placed radially symmetric the cylindrical N-S radially polarized permanent magnets (4), in a N-S, N-S or S-N, S-N sequence, with the magnetic screens (5) made of a ferro-magnetic material placed on two of the faces of the permanent magnets of the rotor.

In this embodiment, the rotor (2) consists of a drum with three symmetrical arms, in which are radially placed, in circular arcs with inclination angles between 18° and 55°, for example of 24° relative to the corresponding radii, cylindrical or rectangular N-S polarized permanent magnets (4), in a sequence N-S, N-S or S-N, S-N, also shielded by the magnetic screens (5) on one to three of the faces of the permanent magnets of the rotor.

Description of the principle of operation

The magnetic screen (5) is built of a ferro-magnetic material with a thickness corresponding to a shielding of the magnetic field of the rotor highest at the contact with the magnetic field of the stator.

The interaction between the magnets of the rotor (4) and the magnets of the stator (4) is of attraction at each entrance in the magnetic field of the stator and of repulsion at each exit from the magnetic field of the stator. The display of the magnetic screens (5) existing between the permanent magnets of the stator (4) and the permanent magnets of the rotor (4), as well as the angles of the incidence vectors of the magnetic fields, resulting from the position in the angles previously described of the magnets of the rotor and of the magnets of the stator, lead to an imbalance between the attraction and the repulsion of the magnetic fields of the rotor and the magnetic fields of the stator; this imbalance has as result a kinetic repulsive impulse of the magnetic field of the rotor (respectively rotor arm) at the exit from every magnetic field of the stator (see fig. 7), which acts kinetically repulsive on the rotor, provided with a shaft, in a single sense of rotation.

Industrial applicability

Fig. 4 and fig. 5 illustrate schematically a variant of use of the device according to the present invention on an electric motor (fig. 4), aiming to adjust the driving torque and to reduce the electrical energy consumption, while fig. 5 represents a variant of assembly of the device according to the present invention on a wind turbine, with the goal to reduce the low kinetic value times, a slow wind respectively.

The implementation of the magnetic device for adjusting the driving torque according to the present invention is not limited to what is presented in the appended drawings, but it can consist in many implementations all encompassed by the scope of the appended claims. Furthermore, the materials as well as the dimensions of the individual components can be the appropriate ones in order to fit the specific requirements.