JP2008079393A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor that makes it possible to increase torque without newly ensuring a magnet installation space and can be reduced in size. <P>SOLUTION: The motor includes at least either of a rotor 11 and a stator 14. The rotor has a magnetic flux generating member that generates magnet magnetic flux equivalent to multiple different numbers of magnetic poles on its surface in a combined manner. The stator is supplied with a current so that multiple magnetic fields corresponding to the multiple numbers of magnetic poles can be combined and rotated. Magnetized magnets 12 are disposed at a portion where magnetic flux is reduced by the combination of magnet magnetic flux so that magnetic flux is concentrated on a portion where magnetic flux is increased by the combination of magnet magnetic flux. The magnetic flux of magnets 12 disposed at least part of the portion where magnetic flux is reduced by the combination of magnet magnetic flux is concentrated on the portion where magnetic flux is increased by the combination of magnet magnetic flux in one or more directions of magnetization. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric motor, and more particularly to an electric motor used for a hybrid vehicle.

  In recent years, many electric motors have been used in automobiles. However, since the object of application is automobiles, demands for miniaturization and higher efficiency are severe. Currently, many automobiles equipped with electric motors for running are hybrid cars that run by combining the output of the engine and the output of the motor, and many have two motors for generator use and electric motor use. There is a “rotary electric machine” (refer to Patent Document 1) as a means for realizing miniaturization and high efficiency of such a motor for a hybrid vehicle.

According to this “rotary electric machine”, it is possible to rotate two rotors independently by supplying power to one stator, and it is possible to generate torque for two motors with one motor physique. In addition, the average value of the current applied to the stator in accordance with both rotors is lower than the average value when the current is simply applied to the two motors, and there is an effect that the loss due to the current is reduced.
Japanese Patent Laid-Open No. 11-275827

However, in the conventional “rotary electric machine”, for example, in the case of a wheel-in motor in which a motor is mounted on the inside of a tire, two output shafts are unnecessary and redundant. In order to generate torque with a low loss, the two rotors are mechanically coupled, making it difficult to reduce the size.
On the other hand, the present applicant, for example, integrates a plurality of rotors having different numbers of pole pairs into a single motor to reduce the size of a single motor (see Japanese Patent Application No. 2005-338874). is suggesting.

On the other hand, it is conceivable to install an auxiliary magnetic pole in order to increase the magnet torque (see Japanese Patent Application Laid-Open No. 2003-347121), but in this case, a place for installing the auxiliary magnetic pole, that is, a magnet installation space is newly provided. It was necessary to secure.
An object of the present invention is to provide an electric motor capable of improving torque without newly securing a magnet installation space and further realizing downsizing.

  In order to achieve the above object, an electric motor according to the present invention corresponds to a rotor having a magnetic flux generating member that generates a magnetic flux corresponding to a plurality of different magnetic poles on its surface and the number of magnetic poles. The stator is provided with at least one of the stators to which a current can be applied so that the plurality of current magnetic fields can be added and rotated, and the magnetic flux can be reduced by adding the magnetic flux to the portion where the magnetic flux is reduced by adding the magnetic flux. Magnets magnetized so that the magnetic flux concentrates on the increased part are arranged.

According to the present invention, a rotor having a magnetic flux generating member for generating a magnetic flux corresponding to a plurality of different magnetic poles on the surface thereof, and a plurality of current magnetic fields corresponding to the plurality of magnetic poles are added together. And at least one of stators to which an electric current is applied so as to be rotated, and the magnet magnetic flux is provided by a magnetized magnet disposed in a portion where the magnetic flux is reduced by adding the magnetic flux of the magnet. The magnetic flux concentrates on the portion where the magnetic flux is increased by the sum of the above.
For this reason, torque can be improved without newly securing a magnet installation space, and further downsizing can be realized.

The best mode for carrying out the present invention will be described below with reference to the drawings.
(First embodiment)
FIG. 1 is an explanatory cross-sectional view schematically showing a configuration of a rotor and a stator of an electric motor according to a first embodiment of the present invention. FIG. 2 is a cross-sectional explanatory view showing an example of another magnetization direction in the magnet of FIG. In addition, the arrow in a figure has shown the magnetization direction of the magnet, and it is the same also in another figure.
As shown in FIG. 1, an electric motor (motor) 10 is a composite magnetic flux motor having a rotor (rotor) 11 that generates a magnetic flux corresponding to a plurality of different magnetic pole numbers. A magnet 12 composed of magnets 12a and 12b having a magnetizing direction is arranged in a flux barrier portion which is a decrease portion of the magnet.

  The magnets 12 arranged in the flux barrier part are magnetized so that the magnetization direction is one or more multi-directions so that the magnetic flux concentrates in the direction of the magnetic flux increasing part by the sum of the magnetic fluxes. As shown in FIG. 2, the magnet 12 may be magnetized in one direction by a set of multi-directional magnetic fluxes (see arrows in the figure) having a plurality of different tilt angles instead of a single angle. . Thereby, by simple arrangement | positioning of the magnet 12, a torque can be improved, without ensuring a magnet installation space newly, or an equivalent torque can be generated with a small magnet amount.

The motor 10 which is this composite magnetic flux motor has a configuration in which a 4-pole rotor and an 8-pole rotor are overlapped.
FIG. 3 is an explanatory cross-sectional view schematically showing a configuration of a rotor and a stator of a motor having a 4-pole pair rotor on a 12-slot stator. FIG. 4 is a cross-sectional explanatory view schematically showing a configuration of a rotor and a stator of a motor having an 8-pole rotor on a 12-slot stator. FIG. 5 is an explanatory cross-sectional view schematically showing a configuration of a rotor and a stator of a motor in which a 4-pole rotor and an 8-pole rotor are overlapped.

  As shown in FIG. 3, the motor 13 is a low magnetic pole number motor having a stator (stator) 14 having 12 slots 14a and a rotor 16 in which a magnet 15 having four pole pairs is arranged. As shown, the motor 17 is a high magnetic pole number motor having a stator 14 having 12 slots 14a and a rotor 18 in which magnets 15 having 8 poles are arranged. As shown in FIG. 5, the motor 19 having a configuration in which the four-pole rotor 16 of the motor 13 (see FIG. 3) and the eight-pole rotor 18 of the motor 17 (see FIG. 4) are overlapped, A portion where the different polarities overlap each other in the rotor radial direction of the rotor 20 is regarded as the flux barrier portion 20a. This is because the portions where the different polarities overlap in the rotor radial direction are offset by the opposite magnetization directions.

That is, in the motor 10 that is a composite magnetic flux motor having a configuration in which a rotor of four pole pairs and a rotor of eight pole pairs are overlapped, a portion considered as a flux barrier portion that is a magnetic flux reduction portion by the sum of magnet magnetic fluxes of the rotor 11 is provided. A magnet 12 (see FIGS. 1 and 2) composed of magnets 12a and 12b magnetized so that the magnetic flux is concentrated in the direction of the magnetic flux increasing portion by the sum of the magnetic fluxes adjacent to this portion is disposed.
Here, the composite magnetic flux motor will be described.

FIG. 6 is a cross-sectional view showing a rotor and a stator of a composite magnetic flux motor. As shown in FIG. 6, the stator 21 of the synchronous motor is composed of 18 divided cores 22, and windings 23 are intensively wound around each of the 18 divided cores 22. . Three windings are arranged as a set (6 sets in total), and each winding is connected in series or in parallel, and one of them is connected to one of the other phases as a neutral point. The other is inside an inverter (not shown) and is connected to the P side and the N side of the power supply line via a switching element. This inverter is configured to control six phases.
Although this stator is described with a divided core, the same operation can be performed with a non-divided core, and the present invention can be applied to a slotless motor. Further, the winding is not limited to concentrated winding but can be applied to distributed winding.

  The rotor 24 includes three magnets N1 to N3 having N poles and six magnets S1 to S6 having S poles, and these magnets include two sets of two types of pole pairs, that is, three pole pairs and six pole pairs. Functions as a magnet. The two sets of magnets in this case are conceptual, and the members are not clearly separated. For one current constituting a composite current supplied to the stator winding, 3 magnets are used. Means that there is one set of magnets that behave as a set of pole pairs, and that there is one set of magnets that behaves as a set of 6 pole pairs for the other current that makes up the composite current The magnets S1 to S6 and N1 to N3 simultaneously function as both sets of magnets.

  The details will be described with reference to FIG. Hereinafter, for convenience of drawing and explanation, the rotor magnets are illustrated and described as N poles and S poles, but the operation and effect of the invention are the same even if the configuration and arrangement of the NS poles are reversed. Please keep in mind. Further, the N-pole and S-pole magnets are magnets in which the magnetization direction is in the radial direction (opposite direction) so that the direction of the magnetic field lines is in the radial direction, and the N pole is on the outer side (stator side). The poles are arranged on the outside (stator side). In this embodiment, the magnet is used in which the magnetizing direction is arranged in the radial direction. However, the present invention is not limited to this arrangement, and there is no problem as long as the magnetic lines of force are directed substantially in the radial direction, for example, a V-shaped magnet. It may be an arrangement.

FIG. 7 is a diagram for explaining the generation of the rotor of FIG. 6. FIG. 7A is a rotor of a motor having a two-rotor structure, in which a magnet having three pole pairs for the inner rotor and six pole pairs for the outer rotor. Prepare. This magnet is arranged in two layers on the surface layer of the inner rotor in (B). Note that the phase is slightly adjusted at the time of arrangement, the details of which will be described later.
7B, in the rotor 24A, two types of magnets (N pole and S pole) having different magnetization directions are in contact with each other at several positions. As is well known, when magnets with different magnetization directions are bonded together, the magnets are equivalent to those without magnets if both magnetic forces are the same.

Therefore, FIG. 7 (C) shows that the magnets are removed from the part where the magnets with different magnetizations as viewed in the radial direction are bonded together, and this rotor 24 has N-pole magnets N1 to N3 and S-poles. Magnets S1 to S6 are included. As a result, the rotor 24 that generates the composite magnetic flux CF of the three-pole pair and the six-pole pair as shown by a curved line is completed. Note that the motor also functions in the configuration of FIG. 7B in which the inner rotor and the outer rotor are integrated. That is, the rotor 24A is a rotor having a configuration in which the first rotor of the inner rotor and the second rotor of the outer rotor are integrated.
The present invention is further directed to the configuration shown in FIG. 7C in which unnecessary magnets are removed, which is an improvement on such a configuration. The torque is improved by reducing the inertia of the deleted magnets. It has the effect of reducing the motor weight and reducing the cost of the deleted magnet.

In FIG. 7C, an area from which unnecessary magnets are removed is a space, and air occupies the area, but the area occupied by the air functions to prevent magnetic flux from passing therethrough. That is, in this area from which the magnet has been removed, it is necessary to place a member other than a material that can easily pass magnetic flux such as iron, but space (air) is usually sufficient. Of course, a member that hardly allows magnetic flux other than air to pass therethrough may be installed in the region.
FIG. 8 is a waveform diagram showing an example of a composite state of two sine waves. That is, each current of the sine wave (amplitude 1) for driving the rotor of 3 pole pair and 6 pole pair, and each waveform as an example of the composite current which compounded these are shown. When both are combined, it can be easily imagined that the waveform changes depending on the phase of both, and the peak of the absolute value, the average value of the absolute value, and the mean square value when the phase is changed are shown in the figure. 9 (A), (B), (C).

FIG. 9 is an explanatory diagram showing changes in peak / average values and the like due to two sine wave composites. When this sine wave composite is applied to a current that generates rotating magnetic flux, the peak of the absolute value is related to the switching element capacity of the inverter, and the average value of the absolute value generates a constant voltage drop. Is involved in the loss of power elements (IGBT, etc.) and diodes, etc., which are constituent members of the above, and the mean square value is related to the loss at a constant resistance such as a winding.
As can be seen from the graph, when the phase difference between the two is 0 (or 30 °), the absolute value peak and the average value of the absolute values are minimized, and the mean square value is constant regardless of the phase. Also, in each figure, the sum of the values obtained for each of the three-pole pair and the six-pole pair is indicated by another line, and it can be seen that both are smaller when combined. Therefore, it can be said that controlling the current so that the phase difference becomes zero is an excellent condition for all of the capacitance of the switching element, the loss of IGBT, etc., and the loss of resistance.

In order for the current to be in this condition, the magnetic flux generated in the rotor needs to be shifted by 1/4 period with respect to each of the three-pole pair and the six-pole pair. Since the 6-pole pair is 15 °, it is only necessary to deviate by 15 °. For this reason, in FIG. 7B, the two magnets are overlapped so that the ends of the magnets are 15 °, so that the loss is minimized.
If this phase difference is used for the purpose of relaxing the magnetic saturation of the magnetic field of the rotor, it is conceivable to apply the configuration with the above phase difference of 0 to the rotor magnet. Regarding the phase difference, there is an optimum phase difference depending on the purpose as described above, and each is set.

Next, the operation will be described. As described above, a six-phase inverter is connected to the stator, and a current may be applied so as to generate a composite sinusoidal magnetic flux corresponding to the rotor magnetic field of three and six pole pairs. The current command is rotated according to the position of the rotor in the same way as a normal motor. However, in this motor, in order to generate a composite magnetic flux corresponding to both pole pairs, first, a set of magnets (set of three pole pairs) is set. ), Three sine waves are generated, so the inverter is considered to have six phases, and the current value at each position obtained by dividing one cycle of the sine wave into six is calculated as a command value for each phase.
On the other hand, since a sine wave of 6 cycles is generated for a set of 6 pole pairs of magnets, it is obtained as a current command value at a position where one cycle of the sine wave is divided into three, and the first and fourth of the 6-phase inverter Phase, second and fifth phases, and third and sixth phase command values. Thereafter, the command values of the 3 pole pair and 6 pole pair are added together, and current control is performed as the command value of the 6-phase inverter. This causes the rotor to generate torque and rotate.

Next, the effect will be described. Torque is generated by the operation described above. Torque is generated by the interaction of field magnetic flux (magnetic flux generated by the rotor) and current magnetic flux (rotational magnetic flux generated by the stator), which is the fundamental wave component of each magnetic flux (in this embodiment). Is generated in response to a three-pole pair and a six-pole pair. In this embodiment, since the magnetic flux obtained by combining the sine waves having the amplitude 1 is generated, the fundamental wave component has the amplitude 1 as a matter of course. Accordingly, it is theoretically possible to generate a torque that is approximately twice that of a motor that is rotated alone with an amplitude of 1 with a single motor.
Further, as described above, the loss generated by the current flowing at that time is smaller than the sum of the single average values for both the absolute value mean and the square mean of the combined current, and thus the loss is clearly small. As described above, it is possible to obtain an effect that the loss due to the current is smaller than that of the two motors while the torque of approximately two is generated by the motor of one physique.

  As described above, the motor 10 that generates magnetic flux obtained by combining sine waves has a magnetic flux generating member (magnet) that generates a magnetic flux corresponding to a plurality of different magnetic pole numbers on its surface. The rotor 11 is provided with either one or both of a stator 14 to which a plurality of current magnetic fields corresponding to the number of magnetic poles are added and a current is supplied so that the rotor 11 can be rotated. The magnet 12 magnetized in one or more directions is arranged in the flux barrier portion 11a, which is a portion where the magnetic flux is reduced due to the sum of the 11 magnetic fluxes, so that the magnetic flux is concentrated on the portion where the magnetic flux is increased due to the sum of the magnetic flux. is doing.

That is, at least a part of the part regarded as the flux barrier part 11a, which is a reduced part of the magnetic flux due to the sum of the magnet magnetic fluxes, is concentrated on the magnet in which the magnetic flux is concentrated in the direction of the increased part of the magnetic flux due to the sum of the magnet magnetic flux adjacent to this part. By replacing, torque can be improved without newly securing a magnet installation space, or equivalent torque can be generated with a small amount of magnets.
As described above, since the auxiliary magnetic pole is arranged in the area where the magnet is not arranged (the magnetic flux blank area necessary for producing the composite magnetic flux), the space efficiency due to the arrangement of the auxiliary magnetic pole is not deteriorated. In other words, the combination of the composite magnetic flux rotor and the auxiliary magnetic pole motor inevitably has a magnet installation space that must be secured in the auxiliary magnetic pole motor, so that there is no disadvantage in the configuration of the auxiliary magnetic pole motor. Is.
(Second Embodiment)

FIG. 10 schematically shows a configuration of a rotor and a stator of an electric motor according to a second embodiment of the present invention, where (a) is a cross-sectional explanatory view when the magnet is arranged on the surface, and (b) is a diagram of the magnet. It is sectional explanatory drawing at the time of embedding arrangement | positioning. As shown in FIG. 10, in the motor 25, the magnetic flux concentrates in the direction of the magnetic flux increasing portion due to the summation of the magnet magnetic flux in the flux barrier portion (see FIG. 5) that is the magnetic flux reduction portion due to the magnetic flux summation of the rotor 26. Thus, the magnet 27 provided with one or more installation angles is arranged. Other configurations and operations are the same as those of the motor 10.
That is, in the motor 25, at least a part of the portion considered as the flux barrier portion 26a that is a magnetic flux decrease portion by the magnet magnetic flux summation of the rotor 26 is provided with a magnetic flux in the direction of the magnetic flux increase portion by the magnet magnetic flux summation adjacent to this portion. The magnet 27 is replaced with a magnet 27 composed of magnets 27a and 27b (see FIG. 10) installed at a concentrated angle.

Thus, if a magnet having a general shape is used as the magnet 27, the torque can be improved at low cost without newly securing a magnet installation space, or the equivalent torque can be generated with a small magnet amount. it can.
(Third embodiment)
FIG. 11 schematically shows a configuration of a rotor and a stator of an electric motor according to a third embodiment of the present invention, where (a) is a cross-sectional explanatory diagram when magnets are arranged on the surface, and (b) is a diagram illustrating magnets. It is sectional explanatory drawing at the time of embedding arrangement | positioning. As shown in FIG. 11, in the motor 30, the magnetic flux concentrates in the flux barrier portion (see FIG. 5), which is a magnetic flux decrease portion due to the sum of the magnet magnetic flux of the rotor 31, in the direction of the magnetic flux increase portion due to the sum of the magnet magnetic flux. Two or more magnets 32 are arranged so that such a composite vector can be formed.

That is, at least a part of the portion regarded as the flux barrier portion 31a that is a magnetic flux reduction portion by the magnet magnetic flux summation of the rotor 31 is applied to the motor 30 in the direction of the magnetic flux increase portion by the magnet magnetic flux summation adjacent to this portion. A plurality (three in this example) of magnets 32a, 32b, and 32c that form a concentrated magnetic flux vector to be concentrated are replaced.
Thereby, since the surface area of a magnet can be earned, torque can be further improved without newly securing a magnet installation space, or equivalent torque can be generated with a small amount of magnet.
(Fourth embodiment)

FIG. 12 schematically shows a configuration of a rotor and a stator of an electric motor according to a fourth embodiment of the present invention, where (a) is a cross-sectional explanatory view when the magnet is arranged on the surface, and (b) is a diagram of the magnet. It is sectional explanatory drawing at the time of embedding arrangement | positioning. As shown in FIG. 12, in the motor 35, the magnetic flux concentrates in the direction of the magnetic flux increasing portion due to the summation of the magnet magnetic flux in the flux barrier portion (see FIG. 5) that is the magnetic flux reduction portion due to the summation of the magnet magnetic flux of the rotor 36. As described above, one or more magnets 37 and one or more flux barrier portions 38 are arranged.
That is, at least a part of the portion of the rotor 36 that is regarded as a flux barrier portion that is a magnetic flux reduction portion by the sum of magnet magnetic fluxes is supplied to the motor 35 in the direction of the magnetic flux increase portion by the sum of the magnet magnetic fluxes adjacent to this portion. The concentrated magnets 37a and 37b are replaced with flux barrier portions 38 located on the outer peripheral sides of the magnets 37a and 37b.

As a result, the magnet can be arranged easily and at a low cost if a magnet having a general shape is used, and the torque can be improved without newly securing a magnet installation space, or a magnet with a small equivalent torque. Can be generated in quantities.
As described above, the electric motor according to the present invention includes a rotor having a magnetic flux generating member that generates a magnetic flux corresponding to a plurality of different magnetic poles on its surface and a plurality of magnetic fluxes corresponding to the plurality of magnetic poles. The stator is provided with at least one of the stators to which current can be added and can be rotated, and the magnetic flux is increased by adding the magnetic flux to the portion where the magnetic flux is reduced by adding the magnetic flux. Magnets magnetized so that the magnetic flux concentrates on the part are arranged.

In other words, by replacing part or all of the flux barrier part, which is the reduced part of the magnetic flux due to the sum of the magnetic fluxes, with a magnet, and concentrating the magnetic flux in the direction of the increasing part of the magnetic flux due to the sum of the magnetic fluxes, a new magnet installation space is provided. Torque can be improved without ensuring, and further downsizing can be realized.
Further, the magnetic flux of the magnet disposed in at least a part of the portion where the magnetic flux is reduced due to the sum of the magnetic fluxes is concentrated on the portion where the magnetic flux is increased due to the sum of the magnet magnetic fluxes according to one or more magnetization directions. In other words, by replacing a part or all of the flux barrier portion, which is a reduced magnetic flux portion due to the sum of magnet magnetic fluxes, with a magnet magnetized so that the magnetic flux is concentrated in the direction of the increased magnetic flux portion due to the sum of magnet magnetic fluxes, With the magnet arrangement, torque can be improved without newly securing a magnet installation space, or equivalent torque can be generated with a small amount of magnets.

  Further, the magnetic flux of the magnet arranged at least in a part where the magnetic flux is reduced due to the sum of the magnetic fluxes is concentrated on the part where the magnetic flux is increased due to the sum of the magnet magnetic flux depending on the installation angle of one or more magnets. In other words, by replacing a part or all of the flux barrier part, which is a reduced magnetic flux part due to the sum of magnet magnetic fluxes, with a magnet provided with an installation angle so that the magnetic flux concentrates in the direction of the increased magnetic flux part due to the sum of magnet magnetic fluxes, If a magnet having a general shape is used, the torque can be improved at a low cost without newly securing a magnet installation space, or an equivalent torque can be generated with a small magnet amount.

  Further, the magnetic flux of the magnet disposed in at least a part of the portion where the magnetic flux is reduced due to the sum of the magnet magnetic fluxes is concentrated on the portion where the magnetic flux is increased due to the sum of the magnet magnetic fluxes by vector synthesis of two or more magnetic fluxes. In other words, by replacing a part or all of the flux barrier part, which is a reduced magnetic flux part due to the sum of magnet magnetic fluxes, with a plurality of magnets that create a composite magnetic flux vector that concentrates the magnetic flux in the direction of the increased magnetic flux part due to the sum of magnet magnetic fluxes. Since the surface area of the magnet can be increased, the torque can be further improved without newly securing a magnet installation space, or the equivalent torque can be generated with a small amount of magnet.

  Further, the magnetic flux of the magnet disposed in at least a part of the portion where the magnetic flux is reduced due to the sum of the magnetic fluxes is concentrated on the portion where the magnetic flux is increased due to the sum of the magnetic fluxes by one or more magnets and one or more flux barriers. ing. In other words, by replacing part or all of the flux barrier part, which is a reduced magnetic flux part due to the sum of magnet magnetic fluxes, with a magnet and a flux barrier so that the magnetic flux is concentrated in the direction of the increased magnetic flux part due to the sum of magnet magnetic fluxes. If a magnet with a general arrangement and a general shape is used, the torque can be improved without securing a new magnet installation space, or the equivalent torque can be generated with a small amount of magnet. it can.

  Note that the motor according to the present invention does not depend on the number of slots of the stator, the number of drive phases, the order of magnetic flux, the order of generated magnetic flux, and the like, and therefore can be realized even when these are different from the present embodiment. In addition, motor shapes such as inner rotor, outer rotor, and axial rotor, stator shapes such as concentrated winding and distributed winding, rotor shapes such as embedded magnets and surface magnets, and magnet shapes such as split magnets, bar magnets, arc magnets, etc. However, since they are not dependent on each other, the same holds true even when they are different from the present embodiment.

It is a section explanatory view showing roughly the composition of the rotor and stator of the electric motor concerning a 1st embodiment of this invention. It is a cross-sectional explanatory drawing which shows the example of the other magnetization direction in the magnet of FIG. FIG. 5 is a cross-sectional explanatory view schematically showing a configuration of a rotor and a stator of a motor having a four-pole pair of rotors in a 12-slot stator. FIG. 5 is a cross-sectional explanatory view schematically showing a configuration of a rotor and a stator of a motor having an 8-pole pair of rotors in a 12-slot stator. FIG. 4 is a cross-sectional explanatory view schematically showing a configuration of a rotor and a stator of a motor in which a 4-pole rotor and an 8-pole rotor are superimposed. It is sectional drawing which shows the rotor and stator of a composite magnetic flux motor. FIG. 7 is an explanatory diagram of generation of the rotor of FIG. 6, (A) is a rotor of a motor with a two-rotor structure, and (B) is a two-layer arrangement of the magnet of (A) on the surface layer of the inner rotor. (C) is the one in which the magnets are excluded from the portion where the magnets with different magnetizations as seen in the radial direction are bonded together. It is a wave form diagram which shows an example of the composite state of two sine waves. It is explanatory drawing which shows the change of the peak, an average value, etc. by two sine wave composites with a graph. The structure of the rotor and stator of the electric motor which concerns on 2nd Embodiment of this invention is shown roughly, (a) is sectional explanatory drawing at the time of arranging a magnet on the surface, (b) is the case where magnet is embedded and arranged FIG. The structure of the rotor and stator of the electric motor which concerns on 3rd Embodiment of this invention is shown roughly, (a) is sectional explanatory drawing at the time of arranging a magnet on the surface, (b) is the case where magnet is embedded and arranged FIG. The structure of the rotor and stator of the electric motor which concerns on 4th Embodiment of this invention is shown roughly, (a) is sectional explanatory drawing at the time of arranging a magnet on the surface, (b) is the case where magnet is embedded and arranged FIG.

Explanation of symbols

10, 13, 17, 19, 25, 30, 35 Motor 11, 16, 18, 20, 24, 24A, 26, 31, 32, 36 Rotor 12, 12a, 12b, 15, 27, 27a, 27b, 32a, 32b, 32c, 37, 37a, 37b, N1 to N3, S1 to S6 Magnet 14a Slot 14, 21 Stator 11a, 20a, 26a, 31a, 38 Flux barrier portion 22 Core 23 Winding

Claims (5)

Adding and rotating a rotor having a magnetic flux generating member that generates a magnetic flux corresponding to a plurality of different magnetic poles on its surface and a plurality of current magnetic fields corresponding to the plurality of magnetic poles. Comprising at least one of the stators to which current can be applied so that
An electric motor in which magnets magnetized so that the magnetic flux concentrates on the portion where the magnetic flux is increased due to the sum of the magnet magnetic fluxes are arranged in the portion where the magnetic flux is reduced due to the sum of the magnet magnetic fluxes.   The magnetic flux of a magnet disposed in at least a part of a portion where the magnetic flux is reduced due to the sum of the magnet magnetic fluxes is concentrated on a portion where the magnetic flux is increased due to the sum of the magnet magnetic fluxes according to one or more magnetization directions. Electric motor.   The magnetic flux of a magnet disposed in at least a part of a portion where the magnetic flux is reduced due to the sum of the magnetic fluxes is concentrated on a portion where the magnetic flux is increased due to the sum of the magnet magnetic fluxes according to an installation angle of one or more magnets. The electric motor described.   2. The magnetic flux of a magnet disposed in at least a part of a portion where the magnetic flux is reduced due to the sum of the magnet magnetic fluxes is concentrated on a portion where the magnetic flux is increased due to the sum of the magnetic fluxes by vector synthesis of two or more magnetic fluxes. The electric motor described.   A magnetic flux of a magnet disposed in at least a part of a portion where the magnetic flux is reduced due to the sum of the magnetic fluxes is concentrated on a portion where the magnetic flux is increased due to the sum of the magnetic fluxes by one or more magnets and one or more flux barriers. Item 4. The electric motor according to Item 1.

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