Electric motor with constant magnets

FIELD: electric engineering, in particular, electric motors with constant magnets.

SUBSTANCE: electric motor with constant magnets includes stator with a winding wound on it and a rotor with magnets. Magnets of the rotor are made of different materials which have different energy values. Thickness of a strong magnet is less than thickness of weak magnets.

EFFECT: reduced growth of material costs of manufacture of magnets, improved torque and increased power of electric motor.

8 cl, 5 dwg

 

The technical field to which the invention relates.

The present invention relates to a motor with permanent magnets mounted on the surface, which is placed radially and magnetized permanent magnets attached to the surface of the rotor, and more specifically, the invention relates to a motor with permanent magnets, which are to improve the performance of the motor is made of expensive rare earth elements and inexpensive ferrite.

The level of technology

In General motors with permanent magnets depending on the configurations of magnetic circuits are divided on the motors with the surface-mounted permanent magnets and motors installed inside a permanent magnet.

Figure 1 shows a schematic view in plan of the electric motor, which is one of the known types of motors with the surface-mounted permanent magnets.

Known motor with the surface-mounted permanent magnets, in which the rotor 20 and stator 10 mainly includes a stator 10 and mounted for rotation within the rotor 20, are placed so that the outer surface of the rotor 20 is in the radial direction at a certain distance from the stator 10 with the formation of the who's who of the ear gap.

The stator 10 has a ring core 11, a set of teeth formed on the inner circumference of the ring core 11 so that the teeth 13 are separated from each other in the circumferential direction, and each of them is tightly wound coil 15 connected to an external power source.

The rotor 20 includes an annular core 21 of the rotor that serves as a magnetic circuit, and the magnet 25 mounted in the radial direction with alternating N and S poles on the outer surface of the core 21 and are in contact with each other with formation of an annular set of magnets so that the set of magnets is rotated in the electromagnetic interaction between the magnet 25 when the current flows through the coil 15.

The stator 10 has twenty-four slots, each of which includes a coil 15 wound on the respective teeth 13, and the rotor 20 has sixteen poles in the form of magnets 25 of the same thickness, made of ferrite or metal and attached to the surface of the core 21 of the rotor.

To increase the torque of the electric motor with the surface-mounted permanent magnets it is possible to optimize the length of the assembled rotor 20 or use the magnets 25, made of expensive rare earth elements.

If you apply the method of increasing the length of the assembled rotor of the motor installed is passed on the surface of the permanent magnets when using magnets of ferrite, the motor will be quite complex and will be difficult to use it in products of limited size, for example in washing machines of the drum type. Since the density of the residual magnetic flux of the ferrite magnets is low, and the increase in torque of the motor will be relatively low compared with the increase of the electric motor.

If all the magnets 25 of the electric motor to perform a rare earth element, the torque of the motor will increase significantly, but the cost of the motor also will increase significantly.

Disclosure of inventions

The present invention has been made considering the above problems, and its objective is the creation of an electric motor with permanent magnets containing magnets, made of expensive rare earth element with high energy, and the magnets of the budget ferrites with low energy, providing increased torque of the electric motor and, consequently, its performance.

In accordance with one aspect of the present invention the above and other problems can be solved through the creation of an electric motor with permanent magnets containing a stator with a wound on him winding and a rotor with magnets installed in the provisions of the relevant article of the Torah, and made of different materials having different densities of the residual magnetic flux or different energy values.

Preferably we are talking about the motor rotation with the rotor installed inside the stator.

Preferably, made of different materials magnets were located in the area of forming one magnetic pole.

Further preferably, one strong magnet with a high density of residual magnetic flux and high energy was located in the center of the magnetic pole, and two weak magnet with a low density of the residual magnetic flux and low energy would lie, respectively, on both sides of a strong magnet.

Even more preferably, the thickness of a strong magnet was equal to or less than the thickness of weak magnets.

Strong magnet may preferably be made of a rare earth element, and weak magnets of ferrite or cermets.

Further preferably, the weak magnets were obtained by forming an N or S pole on one of the magnetic parts.

And preferably also to the part of the rotor, forming a magnetic circuit, was obtained by spiral winding.

In accordance with another aspect of the invention, the electric motor with permanent magnets includes a stator with namorando is on him winding and the rotor, located in the stator and having a set of magnetic pairs installed in positions corresponding to the stator, with each magnet pair includes a strong magnet with a high density of residual magnetic flux and high energy and weak magnets with low density residual magnetic flux and low energy.

Motor with permanent magnets in accordance with the present invention contains magnets of small thickness, made of expensive rare earth elements with high energy, and the magnets of the budget ferrites with low energy, thanks to which limited the increase in material costs for the magnets, improved torque and improved performance of the motor.

Brief description of drawings

The foregoing objectives, features and advantages of the invention will be better understood from the subsequent detailed description and the accompanying drawings.

Figure 1 shows the conventional motor with a permanent magnet;

Figure 2 is a view in plan of the electric motor with a permanent magnet in accordance with the present invention;

On figa and 3B depict a schematic of the distribution of magnetic fluxes of the conventional motor with permanent magnets and electric motor with permanent magnets in accordance with the present invention;

Figure 4 from the reflected comparative graphs, illustrating a lower magnetic flux density for a conventional electric motor with permanent magnets in comparison with an electric motor with permanent magnets in accordance with the present invention;

Figure 5 shows comparative graphs protivoelektrodvizhushchej power of ordinary motor with a permanent magnet and an electric motor with a permanent magnet in accordance with the present invention;

The implementation of the invention

Next, an embodiment of an electric motor with a permanent magnet in accordance with the present invention will be described in more detail with reference to the accompanying drawings.

Although the electric motor with permanent magnets in accordance with the present invention can have many options, here are the most preferred of them. In fact, the design of the motor with permanent magnets in accordance with the present invention are identical to known conventional electric motors with permanent magnets, so its detailed description will be omitted.

As shown in figure 2, the electric motor with permanent magnets in accordance with the present invention is a motor rotation with permanent magnets mounted on the surface, and includes a stator 50, on which is wound a coil 55, and the rotor 60, is within the set of magnetic pairs 65, installed in positions corresponding to the stator 50, and are made of materials with different densities of the residual magnetic flux or with different energy value.

Here is shown the electric motor, which motor rotation, in which the rotor 60 is located in the stator 50. The stator 50 has a ring core 51, the winding 55 connected to the power source and tightly wound on the teeth formed at a distance from each other on the inner surface of the annular core 51.

The rotor 60 includes an annular core 61 of the rotor that serves as a magnetic core, and a magnetic pair 65, made of different materials, N and S poles are arranged alternately in the radial direction on the outer circumference of the core 61 of the rotor and are connected with the formation of a circular set of magnets is rotated by the interaction of magnetic pairs 65 when current flows through the coil 55.

Described here, the stator 50 is of the same construction and the number of grooves as the stator of a conventional motor with permanent magnets, and the rotor 60 has sixteen poles with the formation of a combination of twenty-four (24) groove/sixteen (16) poles.

The magnets of each magnetic pair 65, made of different materials, arranged so that they form a single magnetic pole. In the center of the magnetic pole is located is one strong magnet 66 with a high density of residual magnetic flux, and on both sides of it are two weak magnet 67 with a low density residual magnetic flux.

Strong magnet 66 has a large coercive force demagnetization. Accordingly, it is preferable that a strong magnet 66 has a thickness equal to or smaller than the thickness of the weak magnets 67. Weak magnets 67 receive through education N or S pole on one of the magnetic parts.

Strong magnet 66 is made of rare earth elements, and a weak magnet 67 is ferrite or ceramic-magnet. Magnets made from rare earth elements, have ten times greater coercive force than conventional magnets.

Forming the magnetic core 61 of the rotor 60 is preferably performed using a spiral winding.

Next will be described the operation of the above electric motor with permanent magnets in accordance with the present invention.

As shown in figure 2, a strong magnet 66, made of a rare earth element, and weak ferrite magnets 67 are arranged with the formation of the field containing one N or S pole. Accordingly, placing a strong magnet 66, made of a rare earth element and having a small thickness, between weak ferrite magnets 67 increases the torque of the electric motor and the OTF is to limit the increase in material cost for manufacturing the motor.

Figure 4 illustrates the comparative graphs of the densities of the magnetic fluxes of the conventional motor with permanent magnets and electric motor with permanent magnets in accordance with the present invention. As shown in figure 4, the motor with permanent magnets in accordance with the present invention has a greater magnetic flux density as compared with conventional motors.

Figure 5 illustrates the comparative graphs protivoelektrodvizhushchej power of ordinary motor with permanent magnets and electric motor with permanent magnets in accordance with the present invention. As shown in figure 5, since the average protivoelektrodvizhushchej the power of ordinary motor with permanent magnets is equal to 28, and the average protivoelektrodvizhushchej power motor with permanent magnets in accordance with the present invention is equal to 41, the motor with permanent magnets in accordance with the present invention has a high protivoelektrodvizhushchej power and more torque than a conventional electric motor with permanent magnets of the same design and size.

As follows from the above description, the present invention is a motor with permanent magnets, which contains the magnets of small thickness, carried out the of expensive rare earth elements, and the magnets are made of cheap weak ferrites, making the cost of the magnets is not increased, the torque increases and the growing power of the motor.

Preferred variants of the present invention have been described for illustrative purposes, and any expert will understand that any modifications, additions and substitutions, if they do not go beyond the spirit and scope of the invention as expressed in the claims.

1. Motor with permanent magnets, characterized in that it contains a stator with a wound on him winding and a rotor with magnets, made of different materials having different energy values, and a strong magnet thickness less than the thickness of weak magnets.

2. The electric motor according to claim 1, characterized in that the electric motor is a motor for rotation with the rotor installed inside the stator.

3. The electric motor according to claim 1, characterized by the fact that a strong magnet is located in the center of the magnetic pole, and two weak magnets located respectively on both sides of a strong magnet.

4. The electric motor according to claim 1, characterized by the fact that a strong magnet made of rare earth element.

5. The electric motor according to claim 1, characterized in that the weak magnets made of ferrite or cermets.

6. The electrode is the " according to claim 3, characterized in that the weak magnets obtained by forming an N - or S-pole on one of the magnetic parts.

7. The electric motor according to claim 1, characterized in that the part of the rotor, which is a magnetic core obtained by spiral winding.

8. The electric motor according to claim 1, characterized by the fact that made from different materials magnets are located in a region forming one magnetic pole.



 

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