JP2010068706A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate its control by reducing the drive frequency of a necessary inverter and to improve durability to the high-speed revolution of a shaft by relieving the stress due to centrifugal force working on a rotor, in a permanent magnet synchronous motor. <P>SOLUTION: This motor includes only one first pole 5 and only one second pole 6 as poles, and the first pole 5 and the second pole 6 are equipped with outer sections 5a and 6a, which are arranged on the peripheral side of a rotor 2, and inner sections 5b and 6b, which are superposed, when viewed in the radial direction of the rotor 2, on the outer sections 5a and 6a, and also are arranged on the shaft side of the rotor 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes a cylindrical rotor in which a shaft is inserted at the center and a plurality of permanent magnets arranged annularly with the shaft as a center, and a rotor arranged opposite to the circumferential surface of the rotor. In particular, the present invention relates to a motor having a shaft that rotates at a high speed relative to a general-purpose motor.

In recent years, so-called hybrid automobiles equipped with a motor together with an engine have been put into practical use as automobiles in consideration of the global environment.
As a motor mounted on such a hybrid vehicle, a permanent magnet synchronous motor in which a permanent magnet is accommodated in a rotor as shown in Patent Documents 1 to 11 is used.

  On the other hand, a turbocharger rotates a turbine impeller using exhaust gas from an engine or the like and transmits the rotational drive to the impeller of the compressor to generate compressed air. Due to the fluctuation, torque shortage occurs, and compressed air may not be obtained stably. In view of this, a so-called electric supercharger has been proposed in which the above-described permanent magnet synchronous motor is used as a supercharger to compensate for the above torque shortage by the torque of the permanent magnet synchronous motor.

Japanese Patent No. 3811426 Japanese Patent No. 3819211 Japanese Patent No. 3596542 JP 2006-280195 A JP 2005-198487 A JP-A-2005-354798 JP 2005-328679 A JP 2003-324875 A Japanese Patent Laid-Open No. 2002-44888 JP 2000-350393 A JP 2001-258187 A

  However, the permanent magnet synchronous motor used for the electric supercharger is considerably higher than the permanent magnet synchronous motor mounted on the hybrid vehicle because the turbine impeller and the compressor impeller rotate at high speed. High speed rotation is required.

  The electric supercharger is equipped with an inverter for converting the DC power of the battery into AC power of an arbitrary frequency so that the rotation of the rotor can be controlled. There is a possibility that the drive frequency of the inverter becomes very high. In other words, when the shaft is rotated at a high speed, it is necessary to convert the DC power into a high frequency AC power in order to control the rotation of the rotor, and the drive frequency of the inverter becomes high, making control difficult. It is done.

  Further, when the shaft is rotated at a high speed, the rotor is rotated at a high speed, so that stress due to centrifugal force acts strongly on the permanent magnet housed inside the rotor. For this reason, it is required to increase the durability of the rotor.

  The present invention has been made in view of the above-described problems, and in a permanent magnet synchronous motor, it is easy to control by reducing the drive frequency of the required inverter, and stress due to centrifugal force acting on the rotor. The purpose is to improve the durability against high-speed rotation of the shaft.

  The present invention adopts the following configuration as means for solving the above-described problems.

  According to a first aspect of the present invention, there is provided a cylindrical rotor having a shaft inserted through the center thereof and accommodating therein a plurality of permanent magnets arranged in an annular shape with the shaft as a center, and being disposed opposite to the circumferential surface of the rotor A motor comprising a stator that houses an armature winding for controlling the rotation of the rotor. The motor includes a plurality of permanent magnets in which the stator side is an S pole and the shaft side is an N pole. And a second pole constituted by a plurality of the permanent magnets in which the stator side is an N pole and the shaft side is an S pole, and the first pole and the second pole are provided. At least one of the poles of the rotor is disposed on the peripheral surface side of the rotor, and the inner portion is disposed on the shaft side of the rotor while being disposed so as to overlap the outer portion when viewed from the radial direction of the rotor. When To adopt a configuration that includes.

  According to a second invention, in the first invention, at least one of the outer part and the inner part has a configuration in which the stator side and the shaft side are curved.

  According to a third invention, in the second invention, a permanent magnet having a shape in which at least one of the outer portion and the inner portion is curved on the stator side and the shaft side along the circumferential surface of the rotor, A configuration is adopted in which a plurality are arranged in the circumferential direction of the rotor.

  A fourth invention is the permanent magnet according to the second or third invention, wherein at least one of the outer portion and the inner portion is curved on the stator side and the shaft side along the circumferential surface of the rotor. However, a configuration in which a plurality of the shafts are arranged in the extending direction of the shaft is employed.

  According to a fifth invention, in the fourth invention, a configuration is adopted in which the plurality of permanent magnets arranged in the extending direction of the shaft are arranged so as to be shifted from each other in the circumferential direction of the rotor.

  6th invention employ | adopts the structure provided with the flux barrier which touches the edge part of the said outer side part, and the edge part of the said inner side part in the said any one of the 1st-5th invention.

  According to a seventh invention, in any one of the first to sixth inventions, the seventh invention includes a plurality of the first poles and a plurality of the second poles, wherein the first pole and the second pole are the rotor. The structure of being alternately arranged along the circumferential direction is adopted.

According to the present invention, the first pole constituted by a plurality of permanent magnets having the stator side as the S pole and the shaft side as the N pole, and the plurality of the stator side as the N pole and the shaft side as the S pole. And a second pole constituted by a permanent magnet.
That is, the motor of the present invention is a so-called two-pole motor that includes one first pole and one second pole.
The drive frequency of the inverter increases in proportion to the number of poles of the motor. Therefore, by using the minimum number of poles as in the motor of the present invention, the drive frequency of the inverter can be reduced, for example, with respect to a motor having four or more poles.
Therefore, according to the present invention, in the permanent magnet synchronous motor, the control can be facilitated by reducing the required drive frequency of the inverter.

Further, according to the present invention, at least one of the first pole and the second pole is disposed so as to overlap the outer portion disposed on the circumferential surface side of the rotor and the outer portion as viewed from the radial direction of the rotor. And an inner portion on the shaft side of the rotor.
The magnetic force applied to the stator by the first pole or the second pole is affected by both the magnetic flux from the outer part toward the stator and the magnetic flux from the inner part toward the stator. For this reason, when the magnetic force applied to the stator is fixed, the permanent magnets constituting the inner part and the outer part are divided by dividing the first pole and the second pole into the outer part and the inner part. In the case where the size is not divided into the outer portion and the inner portion, the size can be made smaller than that of the permanent magnets constituting the first pole and the second pole.
When the first pole or the second pole is divided into the outer part and the inner part, the stress due to the centrifugal force received by the inner part is smaller than that of the outer part. The stress caused by the centrifugal force that the pole receives as a whole is smaller than in the case where the pole is not divided into the inner part and the outer part.
Therefore, according to the present invention, it is possible to improve durability against high-speed rotation of the shaft by relieving stress due to centrifugal force acting on the rotor.

  Therefore, according to the present invention, in a permanent magnet synchronous motor, control is facilitated by reducing the required drive frequency of the inverter, and at the same time, the stress caused by centrifugal force acting on the rotor is relieved to reduce the high speed of the shaft. It becomes possible to improve durability against rotation.

It is sectional drawing which showed schematic structure of the motor which is one Embodiment of this invention. It is sectional drawing which showed the motor by which the permanent magnet which is a modification of the motor which is one Embodiment of this invention was divided | segmented into two in the circumferential direction of the rotor. It is sectional drawing which showed the motor by which the permanent magnet which is a modification of the motor which is one Embodiment of this invention was divided | segmented into 3 in the circumferential direction of the rotor. It is sectional drawing which showed the motor by which the permanent magnet which is a modification of the motor which is one Embodiment of this invention was divided | segmented into two in the extension direction of the shaft. It is sectional drawing which showed the motor by which the permanent magnet which is a modification of the motor which is one Embodiment of this invention was divided | segmented into three in the extension direction of the shaft. FIG. 6 is a view showing a skew in a motor in which a permanent magnet which is a modified example of the motor according to the embodiment of the present invention is divided into two in a shaft extending direction. It is the figure which skewed in the motor by which the permanent magnet which is a modification of the motor which is one Embodiment of this invention was divided | segmented into three in the extension direction of the shaft. FIG. 6 is a cross-sectional view of a motor in which two first poles and two second poles 6 are alternately arranged along the circumferential direction of the rotor as a modification of the motor according to the embodiment of the present invention.

  Hereinafter, an embodiment of a motor according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

FIG. 1 is a cross-sectional view schematically showing a schematic configuration of a motor 100 of the present embodiment. In FIG. 1, the motor 100 is cut along a plane perpendicular to the extending direction of the shaft.
The motor 100 of this embodiment is a motor capable of high-speed rotation that can be suitably used particularly for an electric supercharger.
As shown in FIG. 1, the motor 100 of this embodiment includes a shaft 1, a rotor 2, and a stator 3.

The shaft 1 is a rod member that transmits the rotational power generated by the rotor 2 and the stator 3 to the outside, and is arranged extending in the direction perpendicular to the paper surface of FIG.
In addition, since the motor 100 according to the present embodiment is capable of high-speed rotation as described above, the rigidity of the shaft 1 is the shaft included in the motors disclosed in the above-described Patent Documents 1 to 11 cited as the prior art documents. It is desired that the rigidity is higher than the rigidity. And in the motor 100 of this embodiment, the rigidity of the shaft 1 is improved by making the diameter of the shaft 1 larger than the shaft with which the motor disclosed by patent documents 1-11 is equipped.
In addition, when the rigidity of the shaft 1 can be improved by suitably selecting the forming material and shape of the shaft 1, the diameter of the shaft 1 is the same as the diameter of the shaft included in the motor disclosed in Patent Documents 1 to 11. Alternatively, it can be set small.
Moreover, it is preferable that the forming material of the shaft 1 is formed of a non-magnetic material so that the magnetic lines of force of a permanent magnet included in the rotor 2 described later are directed toward the stator 3 efficiently. However, the shaft 1 can also be formed of a magnetic material.

  The rotor 2 and the stator 3 generate a rotational force by a magnetic field line caused by a magnetic field and a current flowing through an armature winding described later, and the stator 3 is fixed and the rotor 2 is rotated.

  The rotor 2 has a cylindrical shape through which the shaft 1 is inserted at the center, and includes a rotor core 4, a first pole 5, a second pole 6, and a flux barrier 7.

The rotor core 4 forms the outer shape of the rotor 2, and is formed into a cylindrical shape in which a hole for inserting the shaft 1 is formed in the central portion and is formed of a magnetic material.
In the rotor core 4, two spaces for accommodating a permanent magnet constituting the first pole 5 and a permanent magnet constituting the second pole 6, which will be described later, are arranged annularly with the shaft as the center. The permanent magnet is accommodated in the space.
That is, in the motor 100 of this embodiment, the rotor 2 accommodates therein a plurality of permanent magnets that are inserted in the center and arranged in an annular shape with the shaft 1 as the center.
The rotor core 4 may be formed, for example, by laminating a plurality of circular electromagnetic steel plates in the extending direction of the shaft 1 or by ferrite in order to suppress the generation of eddy currents on the surface. preferable.

  As shown in FIG. 1, the first pole 5 and the second pole 6 are accommodated by arranging a plurality (two in this embodiment) in an annular shape with the shaft 1 at the center inside the rotor core 4. The permanent magnet 10 is used. In addition, as the permanent magnet 10, a neodymium magnet can be used suitably, for example.

The motor 100 according to this embodiment includes, as the permanent magnet 10, a first outer permanent magnet 11 disposed on the stator side of the rotor 2 while the stator side is the S pole and the shaft side is the N pole, and the stator side is the N pole. And the second outer permanent magnet 12 disposed on the stator side of the rotor 2 with the shaft side being the S pole, and the stator side being the S pole and the shaft side being the N pole and being disposed on the shaft side of the rotor 2. And a second inner permanent magnet 14 disposed on the shaft side of the rotor 2 while the stator side is an N pole and the shaft side is an S pole.
The first outer permanent magnet 11 and the first inner permanent magnet 13 and the second outer permanent magnet 12 and the second inner permanent magnet 14 are arranged so as to overlap each other when viewed from the radial direction of the rotor 2.
Further, the first outer permanent magnet 11, the second outer permanent magnet 12, the first inner permanent magnet 13, and the second inner permanent magnet 14 have shapes in which the stator side and the shaft side are curved along the circumferential surface of the rotor 2. Have.

The first pole 5 is constituted by the first outer permanent magnet 11 and the first inner permanent magnet 13, and the second pole 6 is constituted by the second outer permanent magnet 12 and the second inner permanent magnet 14.
That is, the first pole 5 is disposed so as to overlap the outer portion 5 a disposed on the circumferential surface side of the rotor 2 and the outer portion 5 a when viewed from the radial direction of the rotor 2 and on the shaft side of the rotor 2. It is divided into an inner portion 5b. The second pole 6 is disposed so as to overlap the outer portion 5 a disposed on the peripheral surface side of the rotor 2 and the outer portion 6 a when viewed from the radial direction of the rotor 2 and on the shaft side of the rotor 2. It is divided into an inner portion 6b.

The motor 100 of the present embodiment is a so-called two-pole motor that includes only the first pole 5 and the second pole 6 as poles.
In the motor 100 of the present embodiment, the outer portion 5 a and the inner portion 5 b of the first pole 5 and the outer portion 6 a and the inner portion 6 b of the second pole 6 are viewed from the radial direction of the rotor 2. It is installed in a range of 160 ° without overlapping, and has a length substantially equal to the length of the rotor 2 in the length direction of the rotor 2 (extending direction of the shaft 1).

The flux barrier 7 is provided so as to be in contact with both end portions of the outer portion 5a and the inner portion 5b of the first pole 5 and both end portions of the outer portion 6a and the inner portion 6b of the second pole 6. It is a region having high resistance, and in each of the outer portion 5a and inner portion 5b of the first pole 5 and the outer portion 6a and inner portion 6b of the second pole 6, the stator side to the shaft side or the shaft side to the stator The leakage of magnetic flux to the side is suppressed.
And in the motor 100 of this embodiment, the flux barrier 7 is comprised by the void | hole. However, the flux barrier 7 is not limited to the holes, and can be configured by a member having a low magnetic permeability.
In the case of a high-speed motor such as the motor 100 of the present embodiment, the stress of centrifugal force concentrates on the flux barrier 7 in particular by making the flux barrier 7 a hole. For this reason, as shown in FIG. 1, it is preferable to set the flux barrier 7 in a rounded shape so that stress is relaxed.

  The stator 3 is disposed to face the peripheral surface of the rotor 2 and accommodates an armature winding for controlling the rotation of the rotor. A plurality of armature windings are provided at equal pitches in the circumferential direction of the rotor 2. The number of armature windings is set in consideration of the width of the first pole 5 and the second pole 6 in the circumferential direction of the rotor 2 and the like.

  Although not shown in FIG. 1, the motor 100 of this embodiment may include a casing that covers and supports the stator 3.

  In the motor 100 of this embodiment having such a configuration, the rotor 2 is driven to rotate by supplying AC power from an external DC power source to the armature winding in the stator 3 via an inverter. Power is taken out through the shaft 1.

According to the motor 100 of the present embodiment as described above, the first pole 5 is a permanent magnet 10 (first outer permanent magnet 11 and first inner permanent magnet) in which the stator side is the S pole and the shaft side is the N pole. And the second pole 6 is constituted by a permanent magnet 10 (second outer permanent magnet 12 and second inner permanent magnet 14) in which the stator side is an N pole and the shaft side is an S pole. Yes. That is, the motor 100 according to the present embodiment is a so-called two-pole motor that includes only the first pole 5 and the second pole 6 as poles.
The drive frequency of the inverter that supplies AC power to the armature winding of the stator 3 increases in proportion to the number of poles of the motor. Therefore, by setting the minimum number of poles as in the motor 100 of the present embodiment, the drive frequency of the inverter can be reduced, for example, with respect to a motor having four or more poles.
Therefore, according to the motor 100 of the present embodiment, in the permanent magnet synchronous motor, it is possible to reduce the required drive frequency of the inverter and facilitate control.

Further, according to the motor 100 of the present embodiment, the first pole 5 and the second pole 6 are seen from the outer portions 5 a and 6 a arranged on the circumferential surface side of the rotor 2 and the radial direction of the rotor 2. The outer portions 5a and 6a are disposed so as to overlap with each other, and the inner portions 5b and 6b are provided on the shaft side of the rotor 2.
The magnetic force applied to the stator 3 by the first pole 5 or the second pole 6 is both a magnetic flux directed from the outer portions 5a and 6a toward the stator 3 and a magnetic flux directed toward the stator 3 from the inner portions 5b and 6b. Affected by the magnetic flux. For this reason, when the magnetic force applied to the stator 3 is fixed, the inner part can be obtained by dividing the first pole 5 and the second pole 6 into outer parts 5a, 6a and inner parts 5b, 6b. The size of each permanent magnet (the first outer permanent magnet 11, the second outer permanent magnet 12, the first inner permanent magnet 13 and the second inner permanent magnet 14) constituting the outer portions 5a and 6a is set to the outer side. The size can be made smaller than the permanent magnets constituting the first pole and the second pole when the parts 5a, 6a and the inner parts 5b, 6b are not divided.
And when the 1st pole 5 and the 2nd pole 6 are divided into outside parts 5a and 6a and inside parts 5b and 6b, the stress by the centrifugal force which inner parts 5b and 6b receive is outside parts 5a and 6a. Therefore, the stress due to the centrifugal force received by the first pole 5 and the second pole 6 as a whole is smaller than in the case where the stress is not divided into the inner part and the outer part.
Therefore, according to the motor 100 of the present embodiment, it is possible to improve durability against high-speed rotation of the shaft 1 by relaxing stress due to centrifugal force acting on the rotor 2.

  Therefore, according to the motor 100 of the present embodiment, in the permanent magnet synchronous motor, control is facilitated by reducing the required drive frequency of the inverter, and stress due to centrifugal force acting on the rotor 2 is relieved. As a result, the durability of the shaft 1 against high-speed rotation can be improved.

Further, according to the motor 100 of the present embodiment, the outer portion 5 a and the inner portion 5 b of the first pole 5 and the outer portion 6 a and the inner portion 6 b of the second pole 6 are along the peripheral surface of the rotor 2. The stator side and the shaft side have a curved shape.
In order to ensure the magnetic force acting on the stator 3, the areas of the outer part 5 a and inner part 5 b of the first pole 5 and the outer part 6 a and inner part 6 b of the second pole 6 are set in the circumferential direction of the rotor 2. Although it is necessary to make it as wide as possible, if a general-purpose bar magnet is used and the areas of the outer part 5a and inner part 5b of the first pole 5 and the outer part 6a and inner part 6b of the second pole 6 are increased, Since the bar magnet extends linearly long, the rotor core 4 becomes thick in order to accommodate the bar magnet in the rotor core 4.
On the other hand, the shapes of the outer portion 5a and the inner portion 5b of the first pole 5 and the outer portion 6a and the inner portion 6b of the second pole 6 are formed on the stator side and the shaft along the circumferential surface of the rotor 2. By making the side curved, the outer core 5a and the inner portion 5b of the first pole 5 and the outer portion 6a and the inner portion 6b of the second pole 6 are secured with a large area, and the meat of the rotor core 4 is increased. The thickness can be reduced.
Therefore, according to the motor 100 of the present embodiment, the rotor core 4 can be thinned in the radial direction, and the centrifugal force acting on the rotor 2 can be reduced.

  In the permanent magnet synchronous motor, an induced voltage generated in the armature winding of the stator when the rotor 2 is rotating may be measured, and the rotation of the rotor 2 may be controlled based on the measurement result. In the motor 100 according to the embodiment, the outer portion 5a and the inner portion 5b of the first pole 5 and the outer portion 6a and the inner portion 6b of the second pole 6 are arranged along the circumferential surface of the rotor 2 on the stator side and the shaft side. Since it has a curved shape, the measured induced voltage becomes a sine wave, and the rotation of the rotor 2 can be controlled more accurately.

Note that the permanent magnet 10 (the first outer permanent magnet 11, the second outer permanent magnet 12, the first inner permanent magnet 13, and the second inner permanent magnet 14) included in the motor 100 of the present embodiment includes the first pole 5 and In order to constitute the second pole 6, it is installed in a range of 160 ° in the circumferential direction of the rotor 2, and has a length substantially equal to the length of the rotor 2 in the length direction of the rotor 2 (extending direction of the shaft 1). Have.
For this reason, when manufacturing the permanent magnet of such a magnitude | size, it is assumed that a yield is bad. Therefore, as shown in FIGS. 2 and 3, the permanent magnets 10 (the first outer permanent magnet 11, the second outer permanent magnet 12, the first inner permanent magnet 13, and the second inner permanent magnet 14) are arranged in the circumferential direction of the rotor. It may be 2 minutes or 3 minutes. That is, the outer part 5 a and the inner part 5 b of the first pole 5 and the outer part 6 a and the inner part 6 b of the second pole 6 are curved along the circumferential surface of the rotor 2 on the stator side and the shaft side. The plurality of small permanent magnets 10 a may be arranged in the circumferential direction of the rotor 2.
By adopting such a configuration, the size of each permanent magnet is reduced, the yield of the permanent magnet is improved, and even if it is damaged, only the damaged portion needs to be replaced. The motor 100 of this embodiment can be manufactured at a low price.
One of the permanent magnets 10 (first outer permanent magnet 11, second outer permanent magnet 12, first inner permanent magnet 13, and second inner permanent magnet 14) is divided in the circumferential direction of the rotor 2. Also good.

Further, as shown in FIGS. 4 and 5, the permanent magnets 10 (first outer permanent magnet 11, second outer permanent magnet 12, first inner permanent magnet 13, and second inner permanent magnet 14) are arranged in the length direction of the rotor. It may be 2 minutes or 3 minutes (in the extending direction of the shaft 1). That is, the outer part 5 a and the inner part 5 b of the first pole 5 and the outer part 6 a and the inner part 6 b of the second pole 6 are curved along the circumferential surface of the rotor 2 on the stator side and the shaft side. The plurality of small permanent magnets 10 b may be arranged in the length direction of the rotor 2.
Even when such a configuration is adopted, the size of each permanent magnet is reduced, the yield of the permanent magnet is improved, and even if the permanent magnet is damaged, only the damaged portion needs to be replaced. The motor 100 of this embodiment can be manufactured at a low price.
In the permanent magnet 10, only one of the first outer permanent magnet 11, the second outer permanent magnet 12, the first inner permanent magnet 13, and the second inner permanent magnet 14 is divided in the length direction of the rotor 2. Also good.

As shown in FIGS. 4 and 5, when the permanent magnet 10 is divided into a plurality of parts in the extending direction of the shaft 1, each permanent magnet 10 b is arranged around the rotor 2 as shown in FIGS. 6 and 7. Preferably, the rotor 2 is skewed by being displaced from each other in the direction.
Thus, by skewing the rotor 2, for example, vibration and noise of the motor 100 can be reduced.

  Further, as shown in FIG. 8, two first poles 5 constituted by the outer part 5a and the inner part 5b, and two second poles 6 constituted by the outer part 6a and the inner part 6b, By alternately arranging along the circumferential direction of the rotor 2, the motor 100 may be a 4-pole permanent magnet synchronous motor. That is, in the motor 100, the first pole 5 and the second pole 6 arranged on the rotor 2 are not limited to one each, and a plurality of the first pole 5 and the second pole 6 may be arranged. At this time, the flux barrier 7 is provided so as to be in contact with both end portions of the first pole 5 and the second pole 6.

Thus, in the motor 100, since the rotational speed of the rotor 2 can be increased by increasing the number of poles as shown in FIG. 8, it is possible to realize a small motor that can rotate at high speed. I can do it. Further, in the motor 100, since the flux barrier 7 has a round shape, the stress of the centrifugal force that increases as the rotational speed increases can be relieved, so that the motor 100 can withstand high-speed rotation as compared with the conventional case. . Further, in the motor 100, the flux barrier 7 can reduce magnetic flux (leakage magnetic flux) concentrated inside the rotor 2, that is, magnetic flux that cannot contribute to the rotation of the rotor 2. Thus, the rotor 2 can be rotated. Thus, in the motor 100, since the permanent magnet 10 can be reduced in size by effectively using the magnetic force, the motor itself can be further reduced in size.
By applying such a motor 100 as a generator to a high-speed rotation generator installed with a turbo, it becomes possible to realize a small high-speed rotation generator, so that the engine room is a limited space. Even so, a high-speed rotation generator can be installed in the space.

  The preferred embodiment of the motor according to the present invention has been described above with reference to the accompanying drawings, but the present invention is not limited to the above embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

100 ...... Motor, 1 ... Shaft, 2 ... Rotor, 3 ... Stator, 4 ... Rotor core, 5 ... First pole, 5a ... Outer part, 5b ... Inner part, 6 ... Second Poles, 6a ... outer side, 6b ... inner side, 7 ... flux barrier, 10 ... permanent magnet, 11 ... first outer permanent magnet, 12 ... second outer permanent magnet, 13 ... first Inner permanent magnet, 14 …… Second inner permanent magnet

Claims (7)

A cylindrical rotor that houses a plurality of permanent magnets that are annularly arranged with the shaft at the center and a shaft inserted in the center, and is disposed opposite to the circumferential surface of the rotor and controls the rotation of the rotor A motor including a stator that houses an armature winding for
A first pole constituted by a plurality of the permanent magnets having the stator side as an S pole and the shaft side as an N pole;
A second pole constituted by a plurality of the permanent magnets having the stator side as an N pole and the shaft side as an S pole;
At least one of the first pole and the second pole is disposed so as to overlap with an outer portion disposed on the circumferential surface side of the rotor and the outer portion as viewed from the radial direction of the rotor. An inner portion disposed on the shaft side of the motor.   The motor according to claim 1, wherein at least one of the outer portion and the inner portion has a shape in which the stator side and the shaft side are curved.   At least one of the outer part and the inner part is configured by arranging a plurality of permanent magnets having a shape in which the stator side and the shaft side are curved along the circumferential surface of the rotor in the circumferential direction of the rotor. The motor according to claim 2.   At least one of the outer part and the inner part is configured by arranging a plurality of permanent magnets in a shape in which the stator side and the shaft side are curved along the peripheral surface of the rotor in the extending direction of the shaft. The motor according to claim 2 or 3, wherein the motor is provided.   The motor according to claim 4, wherein the plurality of permanent magnets arranged in the extending direction of the shaft are arranged so as to be shifted from each other in the circumferential direction of the rotor.   The motor according to claim 1, further comprising a flux barrier in contact with an end portion of the outer portion and an end portion of the inner portion. A plurality of the first poles and a plurality of the second poles are provided, and the first poles and the second poles are alternately arranged along a circumferential direction of the rotor. Item 7. The motor according to any one of Items 1 to 6.

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