JP7419501B2 - Magnetization method, electric motor manufacturing method, electric motor, compressor, and air conditioner - Google Patents

Description

The present disclosure relates to a magnetization method for magnetizing a magnetic body of a rotor, and an electric motor.

In general, a magnetization method is known in which permanent magnets (specifically, unmagnetized magnetic bodies) of the rotor are magnetized using coils (also called windings) attached to the stator core. (For example, Patent Document 1).

Japanese Patent Application Publication No. 2015-91192

However, in the conventional technology, there is a problem in that when a current is passed through the coil from a magnetizing power source, a large force is generated in the coil, and the end of the coil in the axial direction of the motor, that is, the coil end, is deformed.

An object of the present disclosure is to prevent significant deformation of the three-phase coil of the stator when magnetizing the rotor with the rotor disposed inside the stator.

A magnetization method according to one aspect of the present disclosure includes:
A fixed device having a stator core having 18×n slots (n is an integer of 1 or more) and a 3-phase coil attached to the stator core with distributed winding and forming 6×n magnetic poles. A magnetization method of magnetizing the magnetic material of the rotor inside the rotor,
The three-phase coil has 6×n U-phase coils, 6×n V-phase coils, and 6×n W-phase coils at the coil end of the three-phase coil. arranging each coil in two slots of the 18×n slots every other slot on one end side of the stator core;
With the center of the magnetic pole of the rotor rotated by a first angle in the first rotation direction of the rotor with respect to the center of the magnetic pole of the three-phase coil, two of the three-phase coils magnetizing the magnetic body by passing current through the phase coil ;
The center of the magnetic pole of the rotor is rotated by a second angle in a second rotation direction that is opposite to the first rotation direction with respect to the center of the magnetic pole of the three-phase coil, magnetizing the magnetic body by passing current through the two phase coils of the three phase coils;
Equipped with
the second angle is equal to the first angle,
The number of slots per pole and per phase of the stator is one.
A magnetization method according to another aspect of the present disclosure includes:
A fixed device having a stator core having 18×n slots (n is an integer of 1 or more) and a 3-phase coil attached to the stator core with distributed winding and forming 6×n magnetic poles. A magnetization method of magnetizing the magnetic material of the rotor inside the rotor,
The three-phase coil has 6×n U-phase coils, 6×n V-phase coils, and 6×n W-phase coils at the coil end of the three-phase coil. arranging each coil in two slots of the 18×n slots every other slot on one end side of the stator core;
magnetizing the magnetic body by passing current through two phase coils of the three-phase coils;
Equipped with
Each of the 18×n slots is provided in an inner layer in which one of the three-phase coils is disposed, and on the outside of the inner layer in the radial direction, and in which one of the three-phase coils is disposed. and an outer layer in which the
Of the 6×n U-phase coils, 3×n U-phase coils are arranged in the outer layer,
The other 3×n U-phase coils among the 6×n U-phase coils are arranged in the inner layer,
Of the 6×n W-phase coils, 3×n W-phase coils are arranged in the outer layer,
The other 3×n W-phase coils among the 6×n W-phase coils are arranged in the inner layer,
A part of the V-phase coil is arranged in the inner layer of the slot in which the U-phase coil is arranged, and another part of the V-phase coil is arranged in the inner layer of the slot in which the W-phase coil is arranged. disposed in the outer layer,
The number of slots per pole and per phase of the stator is one.
A method for manufacturing an electric motor according to another aspect of the present disclosure includes:
A fixed device having a stator core having 18×n slots (n is an integer of 1 or more) and a 3-phase coil attached to the stator core with distributed winding and forming 6×n magnetic poles. With a child
A method of manufacturing an electric motor having a rotor having a magnetic material,
The three-phase coil has 6×n U-phase coils, 6×n V-phase coils, and 6×n W-phase coils at the coil end of the three-phase coil. arranging each coil in two slots of the 18×n slots every other slot on one end side of the stator core;
arranging the rotor inside the stator;
With the center of the magnetic pole of the rotor rotated by a first angle in the first rotation direction of the rotor with respect to the center of the magnetic pole of the three-phase coil, two of the three-phase coils magnetizing the magnetic body by passing current through the phase coil ;
The center of the magnetic pole of the rotor is rotated by a second angle in a second rotation direction that is opposite to the first rotation direction with respect to the center of the magnetic pole of the three-phase coil, magnetizing the magnetic body by passing current through the two phase coils of the three phase coils;
Equipped with
the second angle is equal to the first angle,
The number of slots per pole and per phase of the stator is one.
A method for manufacturing an electric motor according to another aspect of the present disclosure includes:
A fixed device having a stator core having 18×n slots (n is an integer of 1 or more) and a 3-phase coil attached to the stator core with distributed winding and forming 6×n magnetic poles. With a child
A rotor with magnetic material
A method for manufacturing an electric motor, comprising:
The three-phase coil has 6×n U-phase coils, 6×n V-phase coils, and 6×n W-phase coils at the coil end of the three-phase coil. arranging each coil in two slots of the 18×n slots every other slot on one end side of the stator core;
arranging the rotor inside the stator;
magnetizing the magnetic body by passing current through two phase coils of the three-phase coils;
Equipped with
Each of the 18×n slots is provided in an inner layer in which one of the three-phase coils is disposed, and on the outside of the inner layer in the radial direction, and in which one of the three-phase coils is disposed. an outer layer in which the
Of the 6×n U-phase coils, 3×n U-phase coils are arranged in the outer layer,
The other 3×n U-phase coils among the 6×n U-phase coils are arranged in the inner layer,
Of the 6×n W-phase coils, 3×n W-phase coils are arranged in the outer layer,
The other 3×n W-phase coils among the 6×n W-phase coils are arranged in the inner layer,
A part of the V-phase coil is arranged in the inner layer of the slot in which the U-phase coil is arranged, and another part of the V-phase coil is arranged in the inner layer of the slot in which the W-phase coil is arranged. disposed in the outer layer,
The number of slots per pole and per phase of the stator is one.
An electric motor according to another aspect of the present disclosure includes:
A fixed device having a stator core having 18×n slots (n is an integer of 1 or more) and a 3-phase coil attached to the stator core with distributed winding and forming 6×n magnetic poles. With a child
a rotor having a permanent magnet and disposed inside the stator;
The three-phase coil has 6×n U-phase coils, 6×n V-phase coils, and 6×n W-phase coils at the coil end of the three-phase coil,
Each coil of the three-phase coil is arranged in two slots of the 18×n slots every other slot on one end side of the stator core,
With the rotor disposed inside the stator, the permanent magnet is arranged such that the center of the magnetic poles of the rotor is aligned with the center of the magnetic poles of the three-phase coil during a first rotation of the rotor. passing current through two phase coils of the three-phase coils while rotated by a first angle in a direction ; and aligning the center of the magnetic poles of the rotor with the center of the magnetic poles of the three-phase coil. On the other hand, by passing current through the two phase coils of the three-phase coils while the coils are rotated at a second angle in a second rotation direction that is opposite to the first rotation direction, the magnetic It is magnetized by magnetizing the body ,
The number of slots per pole and per phase of the stator is one.
An electric motor according to another aspect of the present disclosure includes:
A fixed device having a stator core having 18×n slots (n is an integer of 1 or more) and a 3-phase coil attached to the stator core with distributed winding and forming 6×n magnetic poles. With a child
a rotor having permanent magnets and disposed inside the stator;
Equipped with
The three-phase coil has 6×n U-phase coils, 6×n V-phase coils, and 6×n W-phase coils at the coil end of the three-phase coil,
Each coil of the three-phase coil is arranged in two slots of the 18×n slots every other slot on one end side of the stator core,
The permanent magnet is magnetized by passing current through two phase coils of the three-phase coils with the rotor disposed inside the stator,
Each of the 18×n slots is provided in an inner layer in which one of the three-phase coils is disposed, and on the outside of the inner layer in the radial direction, and in which one of the three-phase coils is disposed. an outer layer in which the
Of the 6×n U-phase coils, 3×n U-phase coils are arranged in the outer layer,
The other 3×n U-phase coils among the 6×n U-phase coils are arranged in the inner layer,
Of the 6×n W-phase coils, 3×n W-phase coils are arranged in the outer layer,
The other 3×n W-phase coils among the 6×n W-phase coils are arranged in the inner layer,
A part of the V-phase coil is arranged in the inner layer of the slot in which the U-phase coil is arranged, and another part of the V-phase coil is arranged in the inner layer of the slot in which the W-phase coil is arranged. disposed in the outer layer,
The number of slots per pole and per phase of the stator is one.
A compressor according to another aspect of the present disclosure includes:
an airtight container;
a compression device disposed within the closed container;
and the electric motor that drives the compression device.
An air conditioner according to another aspect of the present disclosure includes:
the compressor;
Equipped with a heat exchanger.

According to the present disclosure, when magnetizing is performed with the rotor disposed inside the stator, significant deformation of the three-phase coil of the stator can be prevented.

1 is a top view schematically showing the structure of an electric motor according to Embodiment 1. FIG. FIG. 3 is a cross-sectional view schematically showing the structure of a rotor. FIG. 3 is a top view schematically showing the structure of a stator. It is a figure showing arrangement of three-phase coils in a slot. It is a figure which shows typically the arrangement|positioning of the 3-phase coil in a coil end, and the arrangement|positioning of a 3-phase coil in a slot. It is a flow chart showing an example of a manufacturing process of an electric motor. FIG. 3 is a diagram showing an example of an insertion tool for inserting a three-phase coil into a stator core. It is a figure which shows the process of inserting a 3-phase coil into a stator core. It is a figure which shows the process of inserting a 3-phase coil into a stator core. It is a figure which shows the reference position in a magnetization process. FIG. 3 is a diagram showing a connection between a three-phase coil and a power source for magnetization. It is a figure which shows an example of the first magnetization process. It is a figure which shows an example of the second magnetization process. FIG. 7 is a top view showing an electric motor according to a comparative example. 15 is a diagram showing the arrangement of three-phase coils in the slots of the stator shown in FIG. 14. FIG. It is a figure which shows typically the arrangement|positioning of the 3-phase coil in the coil end of the electric motor based on a comparative example, and the arrangement|positioning of the 3-phase coil in a slot. It is a figure which shows the magnetization process as a comparative example. It is a graph showing the relationship between the angle [degrees] (mechanical angle) with respect to the reference position and the current value [kAT] from the power source for magnetization. 19 is a diagram showing a connection between a three-phase coil and a power source for magnetization in three-phase magnetization shown in FIG. 18. FIG. It is a graph showing the difference in electromagnetic force [N] in the radial direction for each wiring pattern in the three-phase coil, which is generated when the three-phase coil is energized in the magnetization process. It is a graph showing the difference in electromagnetic force [N] in the axial direction for each wiring pattern in the three-phase coil, which is generated when the three-phase coil is energized in the magnetization process. FIG. 7 is a top view showing another example of the electric motor. 23 is a diagram showing the arrangement of three-phase coils in the slots of the stator shown in FIG. 22. FIG. 23 is a diagram schematically showing the arrangement of three-phase coils at the coil end and the arrangement of three-phase coils in slots shown in FIG. 22. FIG. FIG. 2 is a cross-sectional view schematically showing the structure of a compressor according to a second embodiment. FIG. 3 is a diagram schematically showing the configuration of a refrigerating and air conditioning system according to a third embodiment.

Embodiment 1.
In the xyz orthogonal coordinate system shown in each figure, the z-axis direction (z-axis) indicates a direction parallel to the axis Ax of the electric motor 1, and the x-axis direction (x-axis) indicates a direction perpendicular to the z-axis direction (z-axis). The y-axis direction (y-axis) indicates a direction perpendicular to both the z-axis direction and the x-axis direction. The axis Ax is the center of the stator 3 and also the rotation center of the rotor 2. The direction parallel to the axis Ax is also referred to as the "axial direction of the rotor 2" or simply the "axial direction." The radial direction is the radial direction of the rotor 2 or stator 3, and is a direction perpendicular to the axis Ax. The xy plane is a plane perpendicular to the axial direction. An arrow D1 indicates a circumferential direction centered on the axis Ax. The circumferential direction of the rotor 2 or stator 3 is also simply referred to as the "circumferential direction."

<Electric motor 1>
FIG. 1 is a top view schematically showing the structure of an electric motor 1 according to the first embodiment.

The electric motor 1 includes a rotor 2 having a plurality of magnetic poles, a stator 3, and a shaft 4 fixed to the rotor 2. The electric motor 1 is, for example, a permanent magnet synchronous motor.

The rotor 2 is rotatably arranged inside the stator 3. An air gap exists between rotor 2 and stator 3. The rotor 2 rotates around the axis Ax.

FIG. 2 is a cross-sectional view schematically showing the structure of the rotor 2. As shown in FIG.
The rotor 2 has a rotor core 21 and at least one permanent magnet 22 that is a magnetic material. The permanent magnet 22 is a magnetic body that is magnetized using a magnetization method that will be described later.

The rotor core 21 has a plurality of magnet insertion holes 211 and a shaft hole 212 in which the shaft 4 is placed. The rotor core 21 may further include at least one flux barrier section, which is a space communicating with each magnet insertion hole 211.

In this embodiment, the rotor 2 has a plurality of permanent magnets 22. Each permanent magnet 22 is arranged within each magnet insertion hole 211.

One permanent magnet 22 forms one magnetic pole of the rotor 2, ie, a north pole or a south pole. However, two or more permanent magnets 22 may form one magnetic pole of the rotor 2.

In this embodiment, one permanent magnet 22 forming one magnetic pole of the rotor 2 is arranged straight in the xy plane. However, in the xy plane, one set of permanent magnets 22 forming one magnetic pole of the rotor 2 may be arranged so as to have a V-shape.

The center of each magnetic pole of the rotor 2 is located at the center of each magnetic pole of the rotor 2 (that is, the north pole or the south pole of the rotor 2). Each magnetic pole of the rotor 2 (also simply referred to as “each magnetic pole” or “magnetic pole”) means a region that serves as an N pole or an S pole of the rotor 2.

<Stator 3>
FIG. 3 is a top view schematically showing the structure of the stator 3. As shown in FIG.
FIG. 4 is a diagram showing the arrangement of the three-phase coil 32 within the slot 311.
FIG. 5 is a diagram schematically showing the arrangement of the three-phase coil 32 in the coil end 32a and the arrangement of the three-phase coil 32 in the slot 311. In FIG. 5, broken lines indicate the coils of each phase at the coil end 32a, and dashed lines indicate the boundary between the inner layer and the outer layer in each slot 311.
As shown in FIG. 3, the stator 3 includes a stator core 31 and a three-phase coil 32 attached to the stator core 31 with distributed winding.

The stator core 31 includes an annular yoke, a plurality of teeth extending radially from the yoke, and 18×n slots 311 (n is an integer of 1 or more) in which the three-phase coils 32 are arranged. . Each slot 311 is also referred to as, for example, a first slot, a second slot, . . . , an n-th slot. As shown in FIGS. 4 and 5, each of the 18×n slots 311 is provided in the inner layer where one of the three-phase coils 32 is arranged and on the outside of the inner layer in the radial direction. and an outer layer in which one of the three-phase coils 32 is arranged. That is, in the examples shown in FIGS. 4 and 5, the space within each slot 311 is divided into an inner layer and an outer layer. In this embodiment, n=1. Therefore, in the example shown in FIGS. 3 to 5, stator core 31 has 18 slots 311.

The three-phase coil 32 (that is, the coil of each phase) has a coil side arranged in the slot 311 and a coil end 32a not arranged in the slot 311. Each coil end 32a is an end of the three-phase coil 32 in the axial direction.

The three-phase coil 32 includes 6×n U-phase coils 32U, 6×n V-phase coils 32V, and 6×n W-phase coils 32W at each coil end 32a. In other words, the three-phase coil 32 includes 6×n U-phase coils 32U, 6×n V-phase coils 32V, and 6×n W-phase coils 32W on the stator core 31. That is, the three-phase coil 32 has three phases: a first phase, a second phase, and a third phase. For example, the first phase is the U phase, the second phase is the V phase, and the third phase is the W phase. In this embodiment, each of the three phases is referred to as a U phase, a V phase, and a W phase. Each U-phase coil 32U, each V-phase coil 32V, and each W-phase coil 32W shown in FIGS. 1 and 3 are also simply referred to as coils.

In this embodiment, n=1. Therefore, in the example shown in FIGS. 1 and 3, the three-phase coil 32 has six U-phase coils 32U, six V-phase coils 32V, and six W-phase coils 32W at the coil end 32a. ing. However, the number of coils in each phase is not limited to six. In this embodiment, the stator 3 has the structure shown in FIG. 3 in two coil ends 32a. However, the stator 3 only needs to have the structure shown in FIG. 3 in one of the two coil ends 32a.

When current flows through the three-phase coil 32, the three-phase coil 32 forms 6×n magnetic poles. In this embodiment, n=1. Therefore, in this embodiment, when current flows through the three-phase coil 32, the three-phase coil 32 forms six magnetic poles.

As shown in FIGS. 1 and 3, each coil of the three-phase coil 32 is arranged in the slot 311 at one end side of the stator core 31 at a pitch of two slots. The 2-slot pitch means "every 2 slots." That is, a two-slot pitch means that one coil is placed in every two slots 311. In other words, a two-slot pitch means that one coil is placed in every other slot 311. Therefore, as shown in FIGS. 1 and 3, each coil of the three-phase coil 32 is arranged in two slots 311 every other slot on one end side of the stator core 31. In other words, each coil of the three-phase coil 32 is arranged in two slots 311 on one end side of the stator core 31 with one slot 311 in between.

As shown in FIGS. 4 and 5, each slot 311 has two coils arranged therein. Each coil is placed in each slot 311 along with coils of other phases. That is, two coils of different phases are arranged in each slot 311.

<Arrangement of U-phase coil 32U in slot 311>
The arrangement of the U-phase coil 32U within the slot 311 will be specifically described below.
Of the 6×n U-phase coils 32U, 3×n U-phase coils 32U are arranged in the outer layer of the slot 311. The other 3×n U-phase coils 32U among the 6×n U-phase coils 32U are arranged in the inner layer of the slot 311. In the example shown in FIG. 1, three U-phase coils 32U are arranged on the outer layer of the slot 311, and the other three U-phase coils 32U are arranged on the inner layer of the slot 311.

<Arrangement of V-phase coil 32V in slot 311>
The arrangement of the V-phase coil 32V within the slot 311 will be specifically described below.
A part of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the U-phase coil 32U is arranged. The other part of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the W-phase coil 32W is arranged. In other words, if a part of each V-phase coil 32V is arranged in the outer layer of the slot 311 where a coil of another phase is arranged, the other part of each V-phase coil 32V is arranged in the outer layer of the slot 311 where a coil of another phase is arranged. It is arranged in the inner layer of the slot 311. When a part of each V-phase coil 32V is arranged in the inner layer of the slot 311 where a coil of another phase is arranged, the other part of each V-phase coil 32V is arranged in the inner layer of the slot 311 where a coil of another phase is arranged. It is arranged in the outer layer of the slot 311.

<Arrangement of W-phase coil 32W in slot 311>
The arrangement of the W-phase coil 32W within the slot 311 will be specifically described below.
Of the 6×n W-phase coils 32W, 3×n W-phase coils 32W are arranged in the outer layer of the slot 311. The other 3×n W-phase coils 32W among the 6×n W-phase coils 32W are arranged in the inner layer of the slot 311. In the example shown in FIG. 1, three W-phase coils 32W are arranged in the outer layer of the slot 311, and the other three W-phase coils 32W are arranged in the inner layer of the slot 311.

<Arrangement of three-phase coil 32 at coil end 32a>
The 3×n U-phase coils 32U arranged on the outer layer of the slot 311 are arranged at regular intervals in the circumferential direction. The 3×n U-phase coils 32U arranged in the inner layer of the slot 311 are arranged at regular intervals in the circumferential direction. The 6×n V-phase coils 32V are arranged at equal intervals in the circumferential direction. The 3×n W-phase coils 32W arranged in the outer layer of the slot 311 are arranged at regular intervals in the circumferential direction. The 3×n W-phase coils 32W arranged in the inner layer of the slot 311 are arranged at regular intervals in the circumferential direction.

<Winding coefficient>
In the electric motor 1 according to the present embodiment, three slots 311 correspond to one magnetic pole of the rotor 2, and each coil is arranged in the slots 311 at a pitch of two slots. Therefore, the short pitch winding coefficient kp of each coil is determined by the following formula.
kp=sin {P/(Q/S)}×(π/6)
The short pitch winding coefficient of the distributed winding three-phase coil 32 is a coefficient indicating the ratio of the amount of magnetic flux that can be interlinked with one coil. Assuming that P is the number of magnetic poles of the three-phase coil 32, Q is the number of slots 311, and S is the number of slot pitches, in this embodiment, P=6, Q=18, and S=2. Therefore, kp=sin {(6/9)×(π/6)}=0.866. Since the length in the circumferential direction of the three-phase coil 32 forming one magnetic pole is smaller than the length in the circumferential direction of the rotor 2 forming one magnetic pole, the short pitch winding coefficient kp does not become 1.

The distributed winding coefficient kd of the three-phase coil 32 with distributed winding is a coefficient that corrects the phase difference of the magnetic flux interlinking with the three-phase coil 32. When the number of slots per pole and per phase is q, the distributed winding coefficient kd is determined by the following formula.
kd={sin(π/6)}/[q×sin{(π/6)/q}]
In this embodiment, q=1. Therefore, kd=1.

Therefore, in this embodiment, the winding coefficient kw of the electric motor 1 is determined by the following formula.
kw=kp×kd=0.866×1=0.866

<Insulating material>
The stator 3 may include an insulating member that insulates each phase of the three-phase coil 32. The insulating member is, for example, insulating paper.

<Coil connection>
Typically, when two coils are placed in each slot, there is a difference in inductance between the two coils in each slot. In this case, while the motor is being driven, variations in the current flowing through the three-phase coils occur between the phases, and current is difficult to flow in the phase with large inductance, and current is easy to flow in the phase with small inductance. As a result, torque ripple occurs.

If there is a difference in inductance between the coil groups, current will not flow evenly through the coil groups, resulting in current imbalance. In this case, the amplitude of the current flowing through the coil group with small inductance increases, and the phase of the current advances. The amplitude of the current flowing through the coil group with large inductance becomes small, and the phase of the current is delayed. As a result, the motor torque is output with a phase shift, and the sum of the peak amplitude values of the currents flowing through each coil group becomes larger than the sum of the peak amplitude values of the phase currents. Losses such as copper loss caused by resistance increase.

In this embodiment, a U-phase coil 32U, a V-phase coil 32V, and a W-phase coil 32W, which are arranged on the outer layer of the slot 311, are connected in a star connection. A U-phase coil 32U, a V-phase coil 32V, and a W-phase coil 32W arranged in the inner layer of the slot 311 are connected in a star connection. These coils arranged on the outer layer and those arranged on the inner layer are connected in parallel. The neutral points of a star connection are not connected to each other. With this configuration, the unbalance of the inductance is improved, and the unbalance of the current flowing through the three-phase coil 32 is improved.

<Method of manufacturing electric motor 1>
An example of a method for manufacturing the electric motor 1 will be described.
FIG. 6 is a flowchart showing an example of the manufacturing process of the electric motor 1. As shown in FIG. The method for manufacturing the electric motor 1 includes a magnetizing method for magnetizing the magnetic body 22 of the rotor 2.

In step S1, the magnetic body 22 is placed in each magnet insertion hole 211 of the rotor core 21. Specifically, an unmagnetized magnetic body 22 is placed in each magnet insertion hole 211 of the rotor core 21 . In step S1, the shaft 4 may be fixed in the shaft hole 212.

The magnetic material 22 is, for example, a rare earth magnet containing iron, neodymium, boron, and dysprosium. In this case, the dysprosium has been diffused.

The magnetic material 22 may be a rare earth magnet containing iron, neodymium, boron, and terbium. In this case, the terbium has been diffused.

FIG. 7 is a diagram showing an example of an insertion tool 9 for inserting the three-phase coil 32 into the stator core 31.
8 and 9 are diagrams showing the process of inserting the three-phase coil into the stator core 31.
In step S2, the three-phase coil 32 is attached to the prefabricated stator core 31 using the insertion tool 9. In this embodiment, the three-phase coil 32 is attached to the stator core 31 with distributed winding. When inserting the three-phase coil 32 into the stator core 31 using the insertion tool 9 shown in FIG. Insert it inside 31. Next, the three-phase coil 32 is slid in the axial direction and placed in the slot 311.

In this embodiment, at the coil end 32a of the three-phase coil 32, the three-phase coil 32 includes 6×n U-phase coils 32U, 6×n V-phase coils 32V, and 6×n W-phase coils 32W. Each coil of the three-phase coil 32 is arranged in two slots 311 of the 18×n slots 311 every other slot on one end side of the stator core 31 so that

Similarly, in step S2, the three-phase coil 32 is attached to the other end of the stator core 31 with distributed winding. That is, at the coil end 32a of the three-phase coil 32, the three-phase coil 32 has 6×n U-phase coils 32U, 6×n V-phase coils 32V, and 6×n W-phase coils 32W. Each coil of the three-phase coil 32 is arranged in two slots 311 of the 18×n slots 311 every other slot on the other end side of the stator core 31.

In step S3, the U-phase coil 32U, V-phase coil 32V, and W-phase coil 32W are connected. For example, a U-phase coil 32U, a V-phase coil 32V, and a W-phase coil 32W arranged on the outer layer of the slot 311 are connected in a star connection. A U-phase coil 32U, a V-phase coil 32V, and a W-phase coil 32W arranged in the inner layer of the slot 311 are connected in a star connection. These coils arranged on the outer layer and those arranged on the inner layer are connected in parallel.

However, before the three-phase coil 32 is attached to the stator core 31 by distributed winding, the U-phase coil 32U, V-phase coil 32V, and W-phase coil 32W may be connected. In this case, in step S2, the mutually connected U-phase coil 32U, V-phase coil 32V, and W-phase coil 32W may be attached to the stator core 31 by distributed winding.

In step S4, the rotor 2 having the unmagnetized magnetic body 22 is placed inside the stator 3 (specifically, the stator core 31).

<Magnetization process>
A method of magnetizing the magnetic body 22 of the rotor 2 inside the stator 3 will be described.
FIG. 10 is a diagram showing reference positions in the magnetization process.
In step S4, for example, as shown in FIG. 10, the rotor 2 is placed at the reference position. The reference position is a position where the center M1 of the magnetic pole to be magnetized of the rotor 2 coincides with the center of the magnetic pole of the three-phase coil 32 in the xy plane. The center of the magnetic pole of the three-phase coil 32 is the center of the magnetic pole formed when current flows through the three-phase coil. In FIG. 10, the center of the magnetic pole of the three-phase coil 32 is located on the magnetic pole center line C1 shown by a broken line, and the center of the magnetic pole to be magnetized of the rotor 2 is shown by a chain line. It is located on the magnetic pole center line M1.

FIG. 11 is a diagram showing the connection between the three-phase coil 32 and a power source for magnetization.
In step S5, the three-phase coil 32 is connected to a power source for magnetization.

For example, in the example shown in FIG. 11, the V-phase coil 32V is connected to the positive side of the power source, and the U-phase coil 32U is connected to the negative side of the power source. In this case, one end of the W-phase coil 32W is not connected to the power source.

The order of the steps from step S1 to step S5 is not limited to the example shown in FIG. 6, and may be changed as appropriate.

FIG. 12 is a diagram showing an example of the first magnetization process. The arrows on the rotor 2 in FIG. 12 indicate the flow of magnetic flux from the three-phase coil 32.
In step S6, the center of the magnetic pole of the rotor 2 having the unmagnetized magnetic body 22 is rotated by a first angle θ1 in the first rotation direction of the rotor 2 with respect to the center of the magnetic pole of the three-phase coil 32. In this state, current is passed through two phase coils of the three-phase coil 32. That is, current is applied to two phases of the three-phase coils 32 while the center of the magnetic poles of the rotor 2 is rotated by a first angle θ1 from the reference position in the first rotational direction of the rotor 2. Pass. In step S6, current is passed through the U-phase coil 32U or W-phase coil 32W and the V-phase coil 32V. In the connection shown in FIG. 11, in step S6, current is passed through the U-phase coil 32U and V-phase coil 32V, but no current is passed through the W-phase coil 32W. In this embodiment, the first rotation direction is counterclockwise about the axis Ax. The first angle θ1 is greater than 0 degrees and smaller than 11.2 degrees. It is desirable that the first angle θ1 is greater than 0 degrees and smaller than 10 degrees. More preferably, the first angle θ1 is greater than 1.7 degrees and smaller than 11.2 degrees.

When current flows from the power supply to the three-phase coil 32, magnetic flux is generated from the three-phase coil 32, and the magnetic body 22, which is the magnetization target, is magnetized in the direction of easy magnetization. Since the rotor 2 is rotated by the first angle θ1 with respect to the center of the magnetic pole of the three-phase coil 32, the magnetic body 22 can be easily magnetized in the direction in which the magnetic body 22 is easily magnetized. . In particular, one end side in the longitudinal direction of the magnetic body 22 can be easily magnetized in the direction of easy magnetization. In this embodiment, the easy magnetization direction of the magnetic body 22 is the lateral direction of the magnetic body 22 in the xy plane.

FIG. 13 is a diagram showing an example of the second magnetization process. The arrows on the rotor 2 in FIG. 13 indicate the flow of magnetic flux from the three-phase coil 32.
In step S7, the center of the magnetic pole of the rotor 2 is rotated by a second angle θ2 in the second rotation direction of the rotor 2 with respect to the center of the magnetic pole of the three-phase coil 32, and the center of the magnetic pole of the three-phase coil 32 is Pass current through the coils of two of our phases. That is, current is applied to two phases of the three-phase coils 32 while the center of the magnetic poles of the rotor 2 is rotated by a second angle θ2 from the reference position in the second rotational direction of the rotor 2. Pass. The second direction of rotation is opposite to the first direction of rotation. In step S7, current is passed through the U-phase coil 32U or W-phase coil 32W and the V-phase coil 32V. In the connection shown in FIG. 11, in step S7, current is passed through the U-phase coil 32U and V-phase coil 32V, but no current is passed through the W-phase coil 32W. In this embodiment, the second rotation direction is clockwise about the axis Ax. The second angle θ2 is greater than 0 degrees and smaller than 11.2 degrees. The second angle θ2 is preferably greater than 0 degrees and smaller than 10 degrees. More preferably, the second angle θ2 is greater than 1.7 degrees and smaller than 11.2 degrees.

In this embodiment, the second angle θ2 is equal to the first angle θ1.

The second rotation direction may be counterclockwise about the axis Ax. In this case, the first rotation direction is clockwise.

In the second magnetization process, when current flows from the power supply to the three-phase coil 32, magnetic flux is generated from the three-phase coil 32, and the magnetic body 22 as the magnetization target is magnetized in the easy magnetization direction. Since the rotor 2 is rotated by the second angle θ2 with respect to the center of the magnetic pole of the three-phase coil 32, the magnetic body 22 can be easily magnetized in the direction in which the magnetic body 22 is easily magnetized. . In particular, the other end of the magnetic body 22 in the longitudinal direction can be easily magnetized in the direction of easy magnetization.

As a result of the first magnetization process and the second magnetization process, both sides of the magnetic body 22 in the longitudinal direction can be easily magnetized in the easy magnetization direction.

In step S8, the three-phase coil 32 is removed from the power source. Thereby, the electric motor 1 is obtained.

<Comparative example>
FIG. 14 is a top view showing an electric motor 1a according to a comparative example.
FIG. 15 is a diagram showing the arrangement of the three-phase coils 32 in the slots of the stator 3a shown in FIG. 14.
FIG. 16 is a diagram schematically showing the arrangement of the three-phase coil 32 in the coil end 32a and the arrangement of the three-phase coil 32 in the slot 311 of the electric motor 1a according to the comparative example. In FIG. 16, broken lines indicate the coils of each phase at the coil end 32a, and dashed lines indicate the boundary between the inner layer and the outer layer in each slot 311.
In the comparative example, a three-phase coil 32 is attached to the stator core 31 in an overlapping manner. In this case, in each coil end 32a, one side of each coil is arranged on the outer layer of the slot 311, and the other side of the coil is arranged on the inner layer of the other slot 311.

Therefore, when attaching the three-phase coil 32 to the stator core 31 by overlapping winding, it is difficult to attach the three-phase coil 32 to the stator core 31 using an insertion tool (for example, the insertion tool 9 shown in FIG. 7). . Therefore, when attaching the three-phase coil 32 to the stator core 31 by overlapping winding as in the comparative example, the three-phase coil 32 is usually attached to the stator core by hand. In this case, the productivity of the stator 3 decreases.

<Advantages of this embodiment>
The advantages of this embodiment will be explained.
FIG. 17 is a diagram showing a magnetization process as a comparative example.
In the example shown in FIG. 17, the angle with respect to the reference position is zero in the magnetization process. In this case, the direction of the magnetic flux from the three-phase coil 32 is nearly perpendicular to the direction of easy magnetization of the magnetic body 22 as the magnetized object. Therefore, in the example shown in FIG. 17, it is difficult to magnetize both sides of the magnetic body 22 in the xy plane in the easy magnetization direction.

In contrast, in this embodiment, each magnetic pole of the rotor 2 is magnetized twice. Specifically, for each magnetic pole of the rotor 2, the first magnetization is performed with the center of the magnetic pole of the rotor 2 rotated by a first angle θ1 with respect to the center of the magnetic pole of the three-phase coil 32. . With this method, the magnetic body 22 can be magnetized in a state where the direction of the magnetic flux from the three-phase coil 32 is as parallel as possible to the easy magnetization direction of one end side of the magnetic body 22 as the magnetized object. In particular, one end side of the magnetic body 22 in the xy plane is easily magnetized in the direction of easy magnetization.

Further, each magnetic pole of the rotor 2 is magnetized a second time with the center of the magnetic pole of the rotor 2 rotated by a second angle θ2 with respect to the center of the magnetic pole of the three-phase coil 32. With this method, the magnetic body 22 can be magnetized in a state where the direction of the magnetic flux from the three-phase coil 32 is as parallel as possible to the easy magnetization direction of the other end of the magnetic body 22 as the magnetized object. As a result, the magnetic body 22 can be easily magnetized in the direction of easy magnetization without using a large current. In particular, the other end side of the magnetic body 22 in the xy plane is easily magnetized in the easy magnetization direction. Therefore, compared to the example shown in FIG. 17, both sides of the magnetic body 22 in the longitudinal direction can be easily magnetized in the easy magnetization direction.

Furthermore, since the magnetic body 22 can be easily magnetized in the direction of easy magnetization, the magnetic force of the rotor 2 can be increased. As a result, a highly efficient electric motor 1 can be provided.

FIG. 18 is a graph showing the relationship between the angle [degrees] (mechanical angle) with respect to the reference position and the current value [kAT] from the magnetizing power source. In FIG. 18, the angles with respect to the reference position correspond to the above-described first angle θ1 and second angle θ2.
FIG. 19 is a diagram showing the connection between the three-phase coil 32 and the power source for magnetization in the three-phase magnetization shown in FIG. 18.
In FIG. 18, "three-phase magnetization" indicates data obtained by a method of passing current through all phases of three-phase coils. "Two-phase magnetization" indicates data obtained by the method of this embodiment, that is, the method of passing current through only two-phase coils among the three-phase coils.

In three-phase magnetization, it is more difficult to match the magnetic flux from the three-phase coil 32 with the easy magnetization direction of the magnetic body 22 than in two-phase magnetization. Therefore, particularly in order to magnetize both sides of the magnetic body 22 in the longitudinal direction in the direction of easy magnetization, a large current is required. On the other hand, as shown in FIG. 18, compared to three-phase magnetization, the method of this embodiment can reduce the magnetization current.

In three-phase magnetization, the current value is minimum when the first angle θ1 and the second angle θ2 are 7.5 degrees.

When the first angle θ1 and the second angle θ2 are 1.7 degrees < θ1 < 11.2 degrees, 1.7 degrees < θ2 < 11.2 degrees, the magnetization The current from the power supply can be reduced. In this embodiment, when the first angle θ1 and the second angle θ2 are 5.0 degrees, the current value is the minimum.

The magnetic material 22 is, for example, a rare earth magnet containing iron, neodymium, boron, and dysprosium. Therefore, the thickness of the magnetic body 22 can be reduced, and as a result, the current from the magnetization power source in the magnetization process can be reduced.

It is desirable that the dysprosium be subjected to a diffusion treatment. When dysprosium is diffused, dysprosium can be reduced in the magnetic body 22. As a result, the cost of the magnetic body 22 can be reduced.

However, normally, when dysprosium is reduced, the magnetization characteristics of the magnetic material deteriorate, so that the current from the magnetization power source in the magnetization process increases. In contrast, according to the magnetization method of the present embodiment, even when magnetizing the magnetic material 22 containing diffused dysprosium, the current from the magnetization power source can be reduced. can.

The magnetic material 22 may be a rare earth magnet containing iron, neodymium, boron, and terbium. Therefore, the thickness of the magnetic body 22 can be reduced, and as a result, the current from the magnetization power source in the magnetization process can be reduced.

It is desirable that terbium be diffusion treated. When terbium is subjected to diffusion treatment, terbium can be reduced in the magnetic body 22. As a result, the cost of the magnetic body 22 can be reduced.

However, when terbium is reduced, the magnetization characteristics of the magnetic material deteriorate, so that the current from the magnetization power source in the magnetization process increases. In contrast, according to the magnetization method of this embodiment, even when magnetizing the magnetic body 22 containing diffused terbium, the current from the magnetization power source can be reduced.

In this embodiment, since the magnetic poles of the rotor 2 to be magnetized are magnetized twice, a large force is generated in the three-phase coil 32, and the coil end 32a of the three-phase coil 32 is easily deformed.

FIG. 20 is a graph showing the difference in electromagnetic force [N] in the radial direction for each connection pattern in the three-phase coil 32, which is generated when the three-phase coil 32 is energized in the magnetization process.
FIG. 21 is a graph showing the difference in electromagnetic force [N] in the axial direction for each connection pattern in the three-phase coil 32, which is generated when the three-phase coil 32 is energized in the magnetization process.

In FIG. 20, connection patterns P1, P2, and P3 indicate three-phase magnetization data. In the wiring pattern P1, the largest current flows through the U-phase coil 32U during the magnetization process. In the connection pattern P2, the largest current flows through the V-phase coil 32V during the magnetization process. In the connection pattern P3, the largest current flows through the W-phase coil 32W during the magnetization process.

In FIG. 20, connection patterns P4, P5, and P6 indicate two-phase magnetization data. That is, in the wiring pattern P4, current flows through the U-phase coil 32U and the V-phase coil 32V in the magnetization process. In the wiring pattern P5, current flows through the V-phase coil 32V and the W-phase coil 32W in the magnetization process. In connection pattern P6, current flows through U-phase coil 32U and W-phase coil 32W in the magnetization process.

As shown in FIGS. 20 and 21, in three-phase magnetization, electromagnetic force is concentrated on one phase of the three-phase coil 32. In this case, the coil end 32a is easily deformed. On the other hand, in two-phase magnetization as in this embodiment, the electromagnetic force is suppressed, and significant deformation of the coil end 32a can be prevented.

Furthermore, in this embodiment, the three-phase coil 32 is arranged in the slot 311 as described above. Therefore, the unbalance of inductance between the phases is improved, and the unbalance of the current flowing through the three-phase coil 32 is improved. As a result, the electromagnetic force generated in the coil end 32a of a specific phase is reduced, and significant deformation of the coil end 32a can be prevented.

According to this embodiment, the electric motor 1 having the above-mentioned advantages can be manufactured. Furthermore, according to this embodiment, the three-phase coil 32 can be attached to the stator core 31 using the insertion tool 9. Therefore, for example, the stator 3 can be manufactured more efficiently than the stator 3a described as a comparative example.

Variation example.
Another example of the electric motor 1 will be explained.
FIG. 22 is a top view showing another example of the electric motor.
FIG. 23 is a diagram showing the arrangement of the three-phase coils 32 in the slots 311 of the stator 3 shown in FIG. 22.
FIG. 24 is a diagram schematically showing the arrangement of the three-phase coil 32 in the coil end 32a and the arrangement of the three-phase coil 32 in the slot 311 shown in FIG. In FIG. 24, broken lines indicate the coils of each phase at the coil end 32a, and dashed lines indicate the boundary between the inner layer and the outer layer in each slot 311.
In the modified example, the arrangement of the three-phase coil 32 is different from the arrangement described in the first embodiment. In the modified example, a configuration different from that of the first embodiment will be explained. Configurations that are not explained in the modification can be the same configuration as in the first embodiment.

<Arrangement of U-phase coil 32U in slot 311>
The arrangement of the U-phase coil 32U within the slot 311 will be specifically described below.
Each U-phase coil 32U is arranged on the outer layer of the slot 311. That is, 6×n U-phase coils 32U are arranged in the outer layer of the slot 311.

<Arrangement of V-phase coil 32V in slot 311>
The arrangement of the V-phase coil 32V within the slot 311 will be specifically described below.
Each V-phase coil 32V is arranged in the outer layer of the slot 311 and the inner layer of the other slot 311. Specifically, a part of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the U-phase coil 32U is arranged, and another part of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the W-phase coil 32W is arranged. It is arranged in the outer layer of the slot 311. In other words, if a part of each V-phase coil 32V is arranged in the outer layer of the slot 311 where a coil of another phase is arranged, the other part of each V-phase coil 32V is arranged in the outer layer of the slot 311 where a coil of another phase is arranged. It is arranged in the inner layer of the slot 311. When a part of each V-phase coil 32V is arranged in the inner layer of the slot 311 where a coil of another phase is arranged, the other part of each V-phase coil 32V is arranged in the inner layer of the slot 311 where a coil of another phase is arranged. It is arranged in the outer layer of the slot 311.

<Arrangement of W-phase coil 32W in slot 311>
The arrangement of the W-phase coil 32W within the slot 311 will be specifically described below.
Each W-phase coil 32W is arranged in the inner layer of the slot 311. That is, 6×n W-phase coils 32W are arranged in the inner layer of the slot 311.

In a modified example, the three-phase coil 32 forms two star connections. In the modified example, even if two star connections are connected in parallel, the unbalance of inductance between phases is improved, and the unbalance of current flowing through the three-phase coil 32 is improved. As a result, the electromagnetic force generated in the coil end 32a of a specific phase is reduced, and significant deformation of the coil end 32a can be prevented.

In the modified example, this configuration improves the unbalance of inductance between phases, and the unbalance of current flowing through the three-phase coil 32. As a result, the electromagnetic force generated in the coil end 32a of a specific phase is reduced, and significant deformation of the coil end 32a can be prevented.

In the modified example, in the magnetization step, current is passed through the W-phase coil 32W and V-phase coil 32V of the three-phase coil 32, but no current is passed through the U-phase coil 32U. That is, in step S6 and step S7, current is passed through the W-phase coil 32W and V-phase coil 32V, but no current is passed through the U-phase coil 32U. In this case, as shown in FIGS. 20 and 21, the electromagnetic force is suppressed compared to three-phase magnetization, and significant deformation of the coil end 32a can be prevented.

Embodiment 2.
Compressor 300 according to Embodiment 2 will be described.
FIG. 25 is a cross-sectional view schematically showing the structure of the compressor 300.

The compressor 300 includes an electric motor 1 as an electric element, an airtight container 307 as a housing, and a compression mechanism 305 as a compression element (also referred to as a compression device). In this embodiment, compressor 300 is a scroll compressor. However, compressor 300 is not limited to a scroll compressor. Compressor 300 may be a compressor other than a scroll compressor, for example a rotary compressor.

The electric motor 1 in the compressor 300 is the electric motor 1 described in the first embodiment. Electric motor 1 drives compression mechanism 305.

The compressor 300 further includes a subframe 308 that supports the lower end of the shaft 4 (that is, the end opposite to the compression mechanism 305 side).

Compression mechanism 305 is placed inside closed container 307 . The compression mechanism 305 includes a fixed scroll 301 having a spiral portion, an oscillating scroll 302 having a spiral portion that forms a compression chamber between the spiral portion of the fixed scroll 301, and a compliance frame 303 that holds the upper end of the shaft 4. and a guide frame 304 that is fixed to the closed container 307 and holds the compliance frame 303.

A suction pipe 310 that penetrates the closed container 307 is press-fitted into the fixed scroll 301 . Further, the closed container 307 is provided with a discharge pipe 306 that discharges the high-pressure refrigerant gas discharged from the fixed scroll 301 to the outside. This discharge pipe 306 communicates with an opening provided between the compression mechanism 305 of the closed container 307 and the electric motor 1.

The electric motor 1 is fixed to the closed container 307 by fitting the stator 3 into the closed container 307. The configuration of the electric motor 1 is as described above. A glass terminal 309 for supplying electric power to the electric motor 1 is fixed to the closed container 307 by welding.

When the electric motor 1 rotates, the rotation is transmitted to the swinging scroll 302, and the swinging scroll 302 swings. When the swinging scroll 302 swings, the volume of the compression chamber formed by the spiral portion of the swinging scroll 302 and the spiral portion of the fixed scroll 301 changes. Then, refrigerant gas is sucked through the suction pipe 310, compressed, and discharged from the discharge pipe 306.

Compressor 300 includes electric motor 1 described in Embodiment 1, so compressor 300 has the advantages described in Embodiment 1.

Furthermore, since compressor 300 includes electric motor 1 described in Embodiment 1, the performance of compressor 300 can be improved.

Embodiment 3.
A refrigeration and air conditioner 7 as an air conditioner including a compressor 300 according to a second embodiment will be described.
FIG. 26 is a diagram schematically showing the configuration of a refrigerating and air conditioning system 7 according to the third embodiment.

The refrigeration air conditioner 7 is capable of cooling and heating operation, for example. The refrigerant circuit diagram shown in FIG. 26 is an example of a refrigerant circuit diagram of an air conditioner capable of cooling operation.

The refrigeration air conditioner 7 according to the third embodiment includes an outdoor unit 71, an indoor unit 72, and a refrigerant pipe 73 that connects the outdoor unit 71 and the indoor unit 72.

The outdoor unit 71 includes a compressor 300, a condenser 74 as a heat exchanger, a throttle device 75, and an outdoor blower 76 (first blower). Condenser 74 condenses the refrigerant compressed by compressor 300. The throttle device 75 reduces the pressure of the refrigerant condensed by the condenser 74 and adjusts the flow rate of the refrigerant. The expansion device 75 is also referred to as a pressure reduction device.

The indoor unit 72 includes an evaporator 77 as a heat exchanger and an indoor blower 78 (second blower). The evaporator 77 evaporates the refrigerant whose pressure has been reduced by the expansion device 75 to cool the indoor air.

The basic operation of cooling operation in the refrigerating air conditioner 7 will be explained below. In cooling operation, refrigerant is compressed by compressor 300 and flows into condenser 74 . The refrigerant is condensed by the condenser 74, and the condensed refrigerant flows into the throttle device 75. The refrigerant is depressurized by the throttle device 75, and the depressurized refrigerant flows into the evaporator 77. The refrigerant is evaporated in the evaporator 77, and the refrigerant (specifically, refrigerant gas) flows into the compressor 300 of the outdoor unit 71 again. When air is sent to the condenser 74 by the outdoor blower 76, heat is transferred between the refrigerant and the air, and similarly, when air is sent to the evaporator 77 by the indoor blower 78, heat is transferred between the refrigerant and the air. Moving.

The configuration and operation of the refrigerating air conditioner 7 described above are merely examples, and are not limited to the above-mentioned examples.

According to the refrigeration and air conditioner 7 according to the third embodiment, since it has the electric motor 1 described in the first embodiment, the refrigeration and air conditioner 7 has the advantages described in the first embodiment.

Furthermore, since the refrigeration and air conditioner 7 according to the third embodiment includes the compressor 300 according to the second embodiment, the performance of the refrigeration and air conditioner 7 can be improved.

The features of each embodiment and the features of each modification described above can be combined with each other as appropriate.

1 Electric motor, 2 Rotor, 3 Stator, 4 Shaft, 7 Refrigeration and air conditioner, 31 Stator core, 32 3-phase coil, 32a Coil end, 32U U-phase coil, 32V V-phase coil, 32W W-phase coil, 71 Outdoor machine, 72 indoor unit, 74 condenser, 77 evaporator, 300 compressor, 305 compression mechanism, 307 airtight container, 311 slot.

Claims (11)

A fixed device having a stator core having 18×n slots (n is an integer of 1 or more) and a 3-phase coil attached to the stator core with distributed winding and forming 6×n magnetic poles. A magnetization method of magnetizing the magnetic material of the rotor inside the rotor,
The three-phase coil has 6×n U-phase coils, 6×n V-phase coils, and 6×n W-phase coils at the coil end of the three-phase coil. arranging each coil in two slots of the 18×n slots every other slot on one end side of the stator core;
With the center of the magnetic pole of the rotor rotated by a first angle in the first rotation direction of the rotor with respect to the center of the magnetic pole of the three-phase coil, two of the three-phase coils magnetizing the magnetic body by passing current through the phase coil;
The center of the magnetic pole of the rotor is rotated by a second angle in a second rotation direction that is opposite to the first rotation direction with respect to the center of the magnetic pole of the three-phase coil, magnetizing the magnetic body by passing current through the two phase coils of the three phase coils;
Equipped with
the second angle is equal to the first angle,
The number of slots per pole and per phase of the stator is 1,
Each of the 18×n slots is provided in an inner layer in which one of the three-phase coils is disposed, and on the outside of the inner layer in the radial direction, and in which one of the three-phase coils is disposed. and an outer layer in which the
Of the 6×n U-phase coils, 3×n U-phase coils are arranged in the outer layer,
The other 3×n U-phase coils among the 6×n U-phase coils are arranged in the inner layer,
Of the 6×n W-phase coils, 3×n W-phase coils are arranged in the outer layer,
The other 3×n W-phase coils among the 6×n W-phase coils are arranged in the inner layer,
A part of the V-phase coil is arranged in the inner layer of the slot in which the U-phase coil is arranged, and another part of the V-phase coil is arranged in the inner layer of the slot in which the W-phase coil is arranged. located in the outer layer
Magnetization method. A fixed device having a stator core having 18×n slots (n is an integer of 1 or more) and a 3-phase coil attached to the stator core with distributed winding and forming 6×n magnetic poles. A magnetization method of magnetizing the magnetic material of the rotor inside the rotor,
The three-phase coil has 6×n U-phase coils, 6×n V-phase coils, and 6×n W-phase coils at the coil end of the three-phase coil. arranging each coil in two slots of the 18×n slots every other slot on one end side of the stator core;
magnetizing the magnetic body by passing current through two phase coils of the three-phase coils,
Each of the 18×n slots is provided in an inner layer in which one of the three-phase coils is disposed, and on the outside of the inner layer in the radial direction, and in which one of the three-phase coils is disposed. and an outer layer in which the
Of the 6×n U-phase coils, 3×n U-phase coils are arranged in the outer layer,
The other 3×n U-phase coils among the 6×n U-phase coils are arranged in the inner layer,
Of the 6×n W-phase coils, 3×n W-phase coils are arranged in the outer layer,
The other 3×n W-phase coils among the 6×n W-phase coils are arranged in the inner layer,
A part of the V-phase coil is arranged in the inner layer of the slot in which the U-phase coil is arranged, and another part of the V-phase coil is arranged in the inner layer of the slot in which the W-phase coil is arranged. disposed in the outer layer,
The number of slots per pole and per phase of the stator is 1. Magnetization method. 3. The magnetizing method according to claim 1 , wherein current is passed through the U-phase coil or the W-phase coil of the three-phase coil and the V-phase coil. 4. The magnetization method according to claim 1, wherein the magnetic material is a rare earth magnet containing iron, neodymium, boron, and dysprosium. 5. The magnetization method according to claim 4 , wherein the dysprosium is subjected to a diffusion treatment. 4. The magnetization method according to claim 1 , wherein the magnetic material is a rare earth magnet containing iron, neodymium, boron, and terbium. 7. The magnetization method according to claim 6 , wherein the terbium is subjected to a diffusion treatment. A fixed device having a stator core having 18×n slots (n is an integer of 1 or more) and a 3-phase coil attached to the stator core with distributed winding and forming 6×n magnetic poles. With a child
A method of manufacturing an electric motor having a rotor having a magnetic material,
The three-phase coil has 6×n U-phase coils, 6×n V-phase coils, and 6×n W-phase coils at the coil end of the three-phase coil. arranging each coil in two slots of the 18×n slots every other slot on one end side of the stator core;
arranging the rotor inside the stator;
magnetizing the magnetic body by passing current through two phase coils of the three-phase coils,
Each of the 18×n slots is provided in an inner layer in which one of the three-phase coils is disposed, and on the outside of the inner layer in the radial direction, and in which one of the three-phase coils is disposed. and an outer layer in which the
Of the 6×n U-phase coils, 3×n U-phase coils are arranged in the outer layer,
The other 3×n U-phase coils among the 6×n U-phase coils are arranged in the inner layer,
Of the 6×n W-phase coils, 3×n W-phase coils are arranged in the outer layer,
The other 3×n W-phase coils among the 6×n W-phase coils are arranged in the inner layer,
A part of the V-phase coil is arranged in the inner layer of the slot in which the U-phase coil is arranged, and another part of the V-phase coil is arranged in the inner layer of the slot in which the W-phase coil is arranged. disposed in the outer layer,
The number of slots per pole and per phase of the stator is 1. A method for manufacturing an electric motor. A fixed device having a stator core having 18×n slots (n is an integer of 1 or more) and a 3-phase coil attached to the stator core with distributed winding and forming 6×n magnetic poles. With a child
a rotor having a permanent magnet and disposed inside the stator;
The three-phase coil has 6×n U-phase coils, 6×n V-phase coils, and 6×n W-phase coils at the coil end of the three-phase coil,
Each coil of the three-phase coil is arranged in two slots of the 18×n slots every other slot on one end side of the stator core,
The permanent magnet is magnetized by passing current through two phase coils of the three-phase coils with the rotor disposed inside the stator,
Each of the 18×n slots is provided in an inner layer in which one of the three-phase coils is disposed, and on the outside of the inner layer in the radial direction, and in which one of the three-phase coils is disposed. an outer layer in which the
Of the 6×n U-phase coils, 3×n U-phase coils are arranged in the outer layer,
The other 3×n U-phase coils among the 6×n U-phase coils are arranged in the inner layer,
Of the 6×n W-phase coils, 3×n W-phase coils are arranged in the outer layer,
The other 3×n W-phase coils among the 6×n W-phase coils are arranged in the inner layer,
A part of the V-phase coil is arranged in the inner layer of the slot in which the U-phase coil is arranged, and another part of the V-phase coil is arranged in the inner layer of the slot in which the W-phase coil is arranged. disposed in the outer layer,
The number of slots per pole and per phase of the stator is 1. An electric motor. an airtight container;
a compression device disposed within the closed container;
A compressor comprising: the electric motor according to claim 9 , which drives the compression device. A compressor according to claim 10 ,
Air conditioner equipped with heat exchanger and.

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