JP5656719B2 - Permanent magnet type rotating electrical machine and method for manufacturing permanent magnet type rotating electrical machine - Google Patents

Description

  The present invention relates to a permanent magnet type rotating electrical machine and a method for manufacturing a permanent magnet type rotating electrical machine. The permanent magnet type rotating electric machine may be simply called a motor.

In order to obtain a rotating electrical machine with good characteristics in a rotating electrical machine that has a so-called concentrated winding structure with a concentrated winding on the teeth of the stator core, and that uses a permanent magnet as the rotor, A stator having a stator core, and a coil concentratedly wound on individual teeth of the stator core, a rotor core, and a plurality of permanent magnets held by the rotor core; A permanent magnet type rotation in which a permanent magnet is a rare earth magnet and a rare earth magnetic powder is bound by SiO _2. Electrics have been proposed. This permanent magnet type rotating electrical machine can obtain good characteristics such as high output by using a rare earth magnet material (see, for example, Patent Document 1).

  In addition, in a surface-arranged permanent magnet type rotating electrical machine, in addition to high output, a permanent magnet using a rare earth magnet processed into an arc shape having an R smaller than the radius of the rotor in order to suppress cogging, pulsation and the like. A magnet-type rotating electrical machine has also been proposed (see, for example, Patent Document 2).

JP 2009-71910 A (first page, FIG. 5 etc.) JP 2004-173415 A (8th page, FIG. 6 etc.)

  In recent years, permanent magnet type rotating electrical machines used for household equipment, in-vehicle equipment, machine tools, and the like are required to be highly efficient and downsized. Therefore, there is a tendency that the number of permanent magnet type rotating electrical machines using a rare earth magnet material having a high magnetic flux density is increased.

  However, rare earth magnet materials are rare on the earth, and their reserves and production areas are limited, which has been a major factor in increasing the cost of permanent magnet type rotating electrical machines. Furthermore, in recent years, the supply of materials from production areas has tended to fluctuate rapidly, and it has been difficult to secure rare earth magnet materials for equipment premised on mass production.

  Moreover, when the magnet surface is processed into the circular arc shape having R smaller than the radius of the rotor to realize low noise as in Patent Document 2, the material yield is poor and the cost is increased. It was the cause.

  The present invention has been made to solve the above-described problems, and can achieve a small, high-power, low-cost permanent magnet type rotation that can suppress the amount of rare earth magnet material used without lowering the output. A method for manufacturing an electric machine and a permanent magnet type rotating electric machine is provided.

A permanent magnet type rotating electrical machine according to the present invention is a permanent magnet type rotating electrical machine including a stator and a rotor provided inside the stator via a gap,
The rotor is
A yoke formed by laminating a predetermined number of electromagnetic steel sheets punched into a predetermined shape;
A field portion that is provided on the outer peripheral surface of the yoke and includes a main magnet and an auxiliary magnet that form a Halbach array;
And a gap provided at a predetermined position in the yoke facing the auxiliary magnet to suppress magnetic flux leakage of the auxiliary magnet.

  A permanent magnet type rotating electrical machine according to the present invention includes a yoke in which a rotor is formed by laminating a predetermined number of electromagnetic steel plates punched into a predetermined shape, and a main magnet having a Halbach array provided on the outer peripheral surface of the yoke. And an auxiliary magnet and a gap provided in a predetermined position in the yoke facing the auxiliary magnet to suppress the magnetic flux leakage of the auxiliary magnet. Leakage can be prevented, the amount of magnetic flux in the air gap can be increased, output torque is improved, and pulsation is reduced.

FIG. 3 shows the first embodiment and is a cross-sectional view of the permanent magnet type rotating electric machine 100. AA sectional drawing of FIG. FIG. 5 shows the first embodiment and is a cross-sectional view of the stator 110. FIG. 5 shows the first embodiment, and is a transverse cross-sectional view of the stator core 111. FIG. 5 shows the first embodiment, and is a cross-sectional view of the rotor 120. BB sectional drawing of FIG. FIG. 5 shows the first embodiment and is a schematic diagram showing the arrangement and orientation of permanent magnets of the rotor 120. FIG. FIG. 5 shows the first embodiment and is a cross-sectional view of a yoke 121. FIG. 5 shows the first embodiment and is a schematic diagram showing the arrangement and orientation of permanent magnets of a rotor 220 according to a modification. FIG. 5 shows the first embodiment, and shows the effect of reducing the amount of rare earth magnets. FIG. 5 shows the first embodiment, and shows the effect of providing gaps 124 and 224 on the outer circumferences of yokes 121 and 221. FIG. 5 shows the second embodiment, and is a cross-sectional view of a permanent magnet type rotating electric machine 300. CC sectional drawing of FIG. FIG. 5 shows the second embodiment and is a cross-sectional view of a rotor 320. DD sectional drawing of FIG. FIG. 9 is a diagram illustrating the second embodiment, and is a perspective view of a rotor 320 in which a shaft 325 and the like are omitted. FIG. 6 shows the second embodiment and is a perspective view of the first yoke 321a. FIG. 9 shows the second embodiment and is a perspective view of a second yoke 321b. FIG. 9 is a diagram illustrating the second embodiment, and is a perspective view of a yoke 321. FIG. 9 is a partial cross-sectional view of a rotor 420, showing Embodiment 3.

Embodiment 1 FIG.
1 and 2 are diagrams showing Embodiment 1, FIG. 1 is a transverse sectional view of a permanent magnet type rotating electric machine 100, and FIG. 2 is an AA sectional view of FIG. A permanent magnet type rotating electric machine 100 shown in FIGS. 1 and 2 includes a stator 110 and a rotor 120 disposed inside the stator 110 via an air gap 130.

  The permanent magnet type rotating electrical machine 100 of the present embodiment is characterized by the rotor 120. First, the configuration of the stator 110 will be described.

  FIG. 3 is a cross-sectional view of the stator 110 showing the first embodiment. As shown in FIG. 3, the stator 110 includes a stator core 111 and a winding 112 that is housed in a slot (described later) of the stator core 111 and is wound around a tooth (described later).

  FIG. 4 is a cross-sectional view of the stator core 111 showing the first embodiment. As shown in FIG. 4, the entire stator core 111 has a substantially cylindrical shape. The stator core 111 is formed by laminating a predetermined number of electromagnetic steel plates of a thin plate (about several hundred μm, for example, 350 μm in one example) punched into a predetermined shape. The plurality of electromagnetic steel plates are fixed by punching, welding, or the like.

  A stator core 111 shown in FIG. 4 has a cylindrical core back 115 formed on the outer peripheral side. Twelve teeth 113 extend radially from the core back 115 in the direction of the rotor 120 at substantially equal intervals in the circumferential direction. Yes. A space between adjacent teeth 113 is called a slot 114. The number of slots 114 is twelve, which is the same number as the teeth 113.

  The circumferential width of the teeth 113 is substantially constant in the radial direction. Therefore, the circumferential width of the slot 114 between the adjacent teeth 113 gradually increases from the rotor 120 side toward the core back 115.

  The slot 114 is open at the inner peripheral side end of the stator core 111. This portion is called a slot opening 114a. When the stator core 111 is not a split core but an integral one, the winding 112 is inserted into the slot 114 from the slot opening 114a.

  5 to 7 are diagrams showing the first embodiment. FIG. 5 is a transverse sectional view of the rotor 120, FIG. 6 is a sectional view taken along the line BB of FIG. 5, and FIG. It is a schematic diagram which shows orientation. As shown in FIGS. 5 and 6, the rotor 120 includes a substantially cylindrical yoke 121, ten main magnets 122 and auxiliary magnets 123 provided on the outer peripheral surface of the yoke 121, and a substantially central portion of the yoke 121. And a pair of bearings 126a and 126b fixed to both ends of the shaft 125.

  As shown in FIG. 7, an auxiliary magnet 123 is provided between adjacent main magnets 122. The magnetization direction of the main magnet 122 is the radial direction, and the magnetization direction of the auxiliary magnet 123 is the circumferential direction. Such a configuration is called a Halbach array.

  The field part is composed of a main magnet 122 and an auxiliary magnet 123 that form a Halbach array.

  A rare earth permanent magnet is used for the main magnet 122. The rare earth permanent magnet is a rare earth permanent magnet mainly composed of neodymium (element symbol: Nd), iron (element symbol: Fe), and boron (element symbol: B), and dysprosium ( The element symbol: Dy) may be contained. In other words, the rare earth permanent magnet is a magnet containing neodymium, iron, boron, and dysprosium.

  A ferrite magnet is used for the auxiliary magnet 123.

  A notch (described later) is provided on the outer periphery of the yoke 121 where the auxiliary magnet 123 is provided so as to face the auxiliary magnet 123. The gap 124 is formed by combining the auxiliary magnet 123 and the notch. As will be described later, the gap 124 prevents the magnetic flux from the auxiliary magnet 123 from leaking to the yoke 121 side.

  FIG. 8 shows the first embodiment, and is a cross-sectional view of the yoke 121. Similarly to the stator core 111, the yoke 121 is formed by laminating a predetermined number of thin steel plates (several hundred μm, for example 350 μm) punched into a predetermined shape. The plurality of electromagnetic steel plates are fixed by punching, welding, or the like.

  As shown in FIG. 8, the yoke 121 has a substantially cylindrical shape as a whole. The yoke 121 has a notch 128 formed on the outer peripheral surface. Ten notches 128 are formed at substantially equal intervals in the circumferential direction. An auxiliary magnet 123 is provided on the outer peripheral surface of the yoke 121 so as to face the notch portion 128. For example, the auxiliary magnet 123 is fixed to the outer peripheral surface of the yoke 121 by adhesion or the like. Therefore, the circumferential length of the notch 128 is made shorter than the circumferential length of the auxiliary magnet 123 to secure the mounting surface (adhesion surface). Further, the q-axis permeance is ensured by making the circumferential length of the notch 128 shorter than the circumferential length of the auxiliary magnet 123. The length of the notch 128 in the radial direction is the same as that of the air gap 130 and is several hundred μm. When the length in the radial direction of the notch 128 is larger than this, the magnetic path of the magnetic flux of the main magnet 122 is narrowed.

  A shaft hole 127 into which the shaft 125 is fitted is formed at a substantially central portion of the yoke 121.

  FIG. 9 is a diagram showing the first embodiment, and is a schematic diagram showing the arrangement and orientation of the permanent magnets of the rotor 220 according to a modification. The rotor 220 of the modified example is different from the rotor 120 in that the gap 224 is not open to the outside, and that a thin iron core 229 exists between the auxiliary magnet 223 and the gap 224. The air gap 224 is located inside the yoke 221. The radial dimension of the thin iron core portion 229 is about the thickness (for example, 0.35 mm) of the electromagnetic steel sheet. In order to exhibit the function of the air gap 224 for suppressing magnetic flux leakage, it is desirable that the radial dimension of the thin core portion 229 is as small as possible. However, in the example of Embodiment 1, in order to ensure punching accuracy. The dimensions are about the plate thickness.

  By providing the gap 224 inside the yoke 221, the area and q-axis permeance of the mounting surface (adhesion surface) between the auxiliary magnet 223 and the yoke 221 can be made larger than those of the rotor 120.

  FIG. 10 is a diagram showing the first embodiment, and shows the effect of reducing the amount of rare earth magnets.

  By arranging the main magnet 122 with the magnetization direction in the radial direction and the auxiliary magnet 123 with the magnetization direction in the circumferential direction into the Halbach array, the amount of magnetic flux emitted to the outer peripheral side of the rotors 120 and 220 is increased. (Orientation or parallel orientation) is easier to generate torque.

  FIG. 10 compares the output torque ratio and the rare earth magnet weight ratio (100% of the conventional example) for the conventional example, the example in which only the rare earth magnet amount is reduced, and the first embodiment.

The above three types of conventional examples, an example in which only the rare earth magnet amount is reduced, and the first embodiment are as follows.
(1) Conventional example: using rare earth magnets, with radial or parallel orientation;
(2) Example in which only the amount of rare earth magnet is reduced: A rare earth magnet is used, which has a radial orientation or a parallel orientation, and the amount of rare earth magnet is reduced from the conventional example;
(3) Embodiment 1: A Halbach array of a main magnet 122 using a rare earth magnet with a radial magnetization direction and an auxiliary magnet 123 using a ferrite magnet with a circumferential magnetization direction.

  As shown in FIG. 10, in the example in which (2) only the rare earth magnet amount is reduced, the output torque is reduced by 2-3% when the rare earth magnet amount is reduced to about 77% compared to the conventional example.

  However, as in the first embodiment, the amount of rare earth magnets can be reduced as compared with the conventional example by arranging the main magnet 122 with the magnetization direction in the radial direction and the auxiliary magnet 123 with the magnetization direction in the circumferential direction. Even if it is reduced to about 77%, the output torque is not different from the conventional example.

  FIG. 11 is a diagram illustrating the first embodiment, and is a diagram illustrating an effect obtained by providing the gaps 124 and 224 on the outer circumferences of the yokes 121 and 221. Magnetic flux from the auxiliary magnets 123 and 223 is generated by the gap 124 formed by providing the notch 128 on the outer periphery of the yoke 121 or the gap 224 provided on the inner side of the outer periphery of the yoke 221 with the thin core portion 229 interposed therebetween. Leakage to the yokes 121 and 221 side can be prevented, and the amount of magnetic flux in the air gap 130 can be increased. That is, as shown in FIG. 11, it can be seen that the output torque is slightly improved and the pulsation (ripple) is also reduced.

As described above, according to the first embodiment, the following effects can be obtained.
(1) The main magnet 122 using a rare earth magnet with a magnetization direction in the radial direction and the auxiliary magnet 123 using a ferrite magnet with a magnetization direction in the circumferential direction are arranged in a Halbach array, thereby reducing the amount of rare earth magnets to about 77 of the conventional example. Even if it is reduced to%, the output torque is not different from the conventional example.
(2) From the auxiliary magnets 123 and 223, the gap 124 formed by providing the notch 128 on the outer periphery of the yoke 121 or the gap 224 provided inside the outer periphery of the yoke 221 with the thin core portion 229 interposed therebetween. Can be prevented from leaking to the yokes 121 and 221 side, the amount of magnetic flux in the air gap 130 can be increased, the output torque is slightly improved compared to that without air gaps, and pulsation (ripple) is also reduced.
(3) By providing the gap 224 inside the yoke 221, the area and q-axis permeance of the mounting surface (adhesion surface) between the auxiliary magnet 223 and the yoke 221 can be made larger than those of the rotor 120.

Embodiment 2. FIG.
12 and 13 show the second embodiment. FIG. 12 is a transverse sectional view of the permanent magnet type rotating electric machine 300, and FIG. 13 is a sectional view taken along the line CC in FIG. A permanent magnet type rotating electrical machine 300 shown in FIGS. 12 and 13 includes a stator 310 and a rotor 320 disposed inside the stator 310 via an air gap 330.

  Since the configuration of the stator 310 is the same as that of the stator 110 of the first embodiment, description thereof is omitted.

  14 to 16 show the second embodiment. FIG. 14 is a cross-sectional view of the rotor 320, FIG. 15 is a cross-sectional view taken along the line DD of FIG. 14, and FIG. FIG. As shown in FIGS. 14 to 16, the rotor 320 includes a substantially cylindrical yoke 321, ten main magnets 322 and auxiliary magnets 323 provided on the outer peripheral surface of the yoke 321, and a substantially central portion of the yoke 321. And a pair of bearings 326a and 326b fixed to both ends of the shaft 325. However, the air gap provided in the yoke 321 so as to face the auxiliary magnet 323 is not shown.

  Similarly to the rotor 120, the rotor 320 is provided with an auxiliary magnet 323 between adjacent main magnets 322. The magnetization direction of the main magnet 322 is a radial direction, and the magnetization direction of the auxiliary magnet 323 is a Halbach array in the circumferential direction.

  A rare earth permanent magnet is used for the main magnet 322. The rare earth permanent magnet is a rare earth permanent magnet mainly composed of neodymium (element symbol: Nd), iron (element symbol: Fe), and boron (element symbol: B), and dysprosium ( The element symbol: Dy) may be contained. In other words, the rare earth permanent magnet is a magnet containing neodymium, iron, boron, and dysprosium.

  A ferrite magnet is used for the auxiliary magnet 323.

  This embodiment is characterized by the yoke 321. 17 to 19 are diagrams showing the second embodiment. FIG. 17 is a perspective view of the first yoke 321a, FIG. 18 is a perspective view of the second yoke 321b, and FIG. 19 is a perspective view of the yoke 321.

  The yoke 321 is divided into two in the axial direction, and includes a first yoke 321a and a second yoke 321b.

As shown in FIG. 17, the first yoke 321a includes the following elements.
(1) A first yoke body 321a-1 having an axial length La shorter than the axial length Lc of the yoke 321 and having a substantially cylindrical shape.
(2) The first yoke radial extending portion 321a-2 (outside of the first yoke main body 321a-1 is formed to protrude outward (radial direction) from the outer peripheral surface of the first yoke body 321a-1. The surface becomes the main magnet mounting surface). The number of the first yoke radial direction overhanging portions 321a-2 is ten, which is the same as the number of the main magnets 322.
(3) A first end having an axial length La, which is formed by the circumferential end portions of the adjacent first yoke radial extending portions 321a-2 and the outer peripheral surface of the first yoke body 321a-1. Yoke connecting portion 321a-3.

  The first yoke 321a is formed by laminating a predetermined number of electromagnetic steel plates that are punched into a predetermined shape (several hundred μm, for example, 350 μm). The plurality of electromagnetic steel plates are fixed by punching, welding, or the like.

As shown in FIG. 18, the second yoke 321b includes the following elements.
(1) A second yoke body 321b-1 having a substantially cylindrical shape and a length Lb in the axial direction shorter than the length Lc in the axial direction of the yoke 321.
(2) Second yoke radial projecting portions 321b-2 (outside of the outer surface of the second yoke main body 321b-1 are formed so as to project outward (radial direction) from the outer peripheral surface of the second yoke main body 321b-1. The surface becomes the auxiliary magnet mounting surface). There are ten second yoke radial extending portions 321b-2, which is the same number as the auxiliary magnets 323.
(3) A second end of the axial length Lb is formed by the opposing circumferential end of the adjacent second yoke radial extending portion 321b-2 and the outer peripheral surface of the second yoke body 321b-1. Yoke connecting portion 321b-3.

The axial length La of the first yoke body 321a-1 and the first yoke coupling portion 321a-3, the axial length Lb of the second yoke body 321b-1 and the second yoke coupling portion 321b-3, and The axial length Lc of the yoke 321 has the following relationship.
La + Lb = Lc

  As shown in FIG. 19, the yoke 321 is formed by fitting a first yoke 321a and a second yoke 321b together in the axial direction. The second yoke radial extending portion 321b-2 of the second yoke 321b is inserted into the first yoke coupling portion 321a-3 of the first yoke 321a. At the same time, the first yoke radial extending portion 321a-2 of the first yoke 321a is inserted into the second yoke coupling portion 321b-3 of the second yoke 321b. The first yoke 321a and the first yoke 321a and the second yoke 321b are in contact with the first yoke 321a and the second yoke 321b until the axial end portions inside the second yoke body 321b-1 come into contact with each other. The two yokes 321b are fitted together along the axial direction.

  After the first yoke 321a and the second yoke 321b are connected, the shaft 325 is press-fitted, coked or baked into the shaft hole 321a-4 of the first yoke 321a and the shaft hole 321b-4 of the second yoke 321b. It is inserted and fixed by a method such as fitting.

  A gap (not shown) that suppresses leakage of magnetic flux from the auxiliary magnet 323 to the yoke 321 side in the second yoke radial extending portion 321b-2 of the second yoke 321b, as in the first embodiment. May be provided. In that case, the air gap may be formed by providing a notch on the outer peripheral portion of the second yoke radial extending portion 321b-2 (leaving the surface on which the auxiliary magnet 323 is mounted), or a thin iron core portion. A through-hole may be provided in the second yoke radial extending portion 321b-2 with (the thickness of the electromagnetic steel plate about) (when the surface on which the auxiliary magnet 323 is mounted is a notch) Wider than).

  A main magnet 322 is attached to the outer peripheral surface of the first yoke radial extending portion 321a-2 of the first yoke 321a over substantially the entire axial direction. In addition, the auxiliary magnet 323 is attached to the outer peripheral surface of the second yoke radial protruding portion 321b-2 of the second yoke 321b over substantially the entire axial direction.

  Attaching the first magnet 322 to the first yoke radial extension 321a-2 of the first yoke 321a or the auxiliary magnet 323 to the second yoke radial extension 321b-2 of the second yoke 321b. The mounting is performed before the yoke 321 is assembled.

  The main magnet 322 is attached to the first yoke radial extension 321a-2 of the first yoke 321a, and the auxiliary magnet 323 is attached to the second yoke radial extension 321b-2 of the second yoke 321b. Assembling the yoke 321 after that facilitates the positioning of the magnets (the main magnet 322 and the auxiliary magnet 323), and the rotor 320 in the Halbach array can be easily obtained.

  The first yoke diametrically extending portion 321a-2 of the first yoke 321a and the second yoke diametrically extending portion 321b-2 of the second yoke 321b are each provided with a magnet at one end (circumferential direction). You may have the radial direction protrusion part (not shown) for positioning (the main magnet 322 and the auxiliary magnet 323).

Embodiment 3 FIG.
FIG. 20 is a partial cross-sectional view of the rotor 420 showing the third embodiment. The rotor 420 shown in FIG. 20 is between the first yoke radial extending portion 421a-2 of the first yoke 421a and the second yoke radial extending portion 421b-2 of the second yoke 421b. In addition, a gap 429 (backlash) having a predetermined circumferential dimension is provided.

  In that case, the first yoke radial direction overhanging part 421a-2 of the first yoke 421a and the second magnetic flux density distribution after the assembly of the rotor 420 are optimized (the harmonic component is minimized). Assembling is performed while adjusting the circumferential position of the second yoke radial extending portion 421b-2 of the yoke 421b.

  As a result, variations in the magnet shape can be absorbed, and distortion of the air gap magnetic flux density can be suppressed to reduce vibration.

  In the present embodiment, the first yoke radial extending portion 421a-2 of the first yoke 421a and the first protruding portion 421a-2 of the first yoke 421a are optimized so that the magnetic flux density distribution after the assembly of the rotor 420 is optimized (the harmonic component is minimized). Since the second yoke 421b is assembled while adjusting the circumferential position of the second yoke radial extending portion 421b-2, before the first yoke 421a and the second yoke 421b are combined, the main magnet 422, the auxiliary The magnets 423 need to be magnetized.

  Sintered magnets (rare earth magnets) tend to vary in shape (tolerance is often ± 0.1 mm), and cogging and ripple may increase depending on the attachment position, but the main magnet 422 and auxiliary magnet By adjusting the circumferential positional relationship with 423, the magnetic flux density distribution in the air gap can be optimized, and an extreme increase in cogging ripple can be avoided.

  100 permanent magnet type rotating electric machine, 110 stator, 111 stator core, 112 winding, 113 teeth, 114 slot, 114a slot opening, 115 core back, 120 rotor, 121 yoke, 122 main magnet, 123 auxiliary magnet, 124 gap, 125 shaft, 126a bearing, 126b bearing, 128 notch, 130 air gap, 220 rotor, 221 yoke, 222 main magnet, 223 auxiliary magnet, 224 gap, 229 thin iron core, 300 permanent magnet type rotating electrical machine , 310 stator, 320 rotor, 321 yoke, 321a first yoke, 321a-1 first yoke body, 321a-2 first yoke radial projecting portion, 321a-3 first yoke coupling portion, 321a-4 Shaft hole, 321b Second yoke, 321b DESCRIPTION OF SYMBOLS 1 2nd yoke main body, 321b-2 2nd yoke radial direction overhang | projection part, 321b-3 2nd yoke connection part, 321b-4 axial hole, 322 main magnet, 323 auxiliary magnet, 325 shaft, 326a bearing, 326b bearing, 330 air gap, 420 rotor, 421a first yoke, 421a-2 first yoke radial overhang, 421b second yoke, 421b-2 second yoke radial overhang, 429 Gaps.

Claims (11)

A permanent magnet type rotating electrical machine comprising a stator and a rotor provided via an air gap inside the stator,
The rotor is
A yoke formed by laminating a predetermined number of electromagnetic steel sheets punched into a predetermined shape;
A field portion that is provided on the outer peripheral surface of the yoke and includes a main magnet having a radial magnetization direction and an auxiliary magnet having a circumferential magnetization direction ;
A permanent magnet type rotating electrical machine, comprising: a gap provided at a predetermined position in the yoke facing the auxiliary magnet for suppressing magnetic flux leakage of the auxiliary magnet. A notch having a predetermined shape is formed on the outer periphery of the yoke so as to face the auxiliary magnet at substantially equal intervals in the circumferential direction, and the notch constitutes the gap. The permanent magnet type rotating electrical machine according to claim 1. The permanent magnet type rotating electric machine according to claim 1 , wherein the gap is formed inside the outer peripheral portion of the yoke via a thin iron core portion. The circumferential length of the air gap, the permanent magnet rotating electric machine according to any one of claims 1 to 3, characterized in that shorter than the circumferential length of the auxiliary magnets. The permanent magnet type rotating electric machine according to any one of claims 1 to 4, wherein a rare earth permanent magnet is used for the main magnet and a ferrite magnet is used for the auxiliary magnet. The yoke is
Divided into two in the axial direction, composed of a first yoke and a second yoke ;
The first yoke is
A substantially cylindrical first yoke body having an axial length La shorter than an axial length Lc of the yoke;
A first yoke radial projecting portion formed to project outward from the outer peripheral surface of the first yoke body and provided at substantially equal intervals in the circumferential direction;
A first yoke coupling portion formed by an opposing circumferential end portion of the adjacent first yoke radial projecting portion and an outer circumferential surface of the first yoke body, and having an axial length La; Have
The second yoke is
A substantially cylindrical second yoke body having an axial length Lb shorter than the axial length Lc of the yoke;
A second yoke radial projecting portion formed to project outward from the outer peripheral surface of the second yoke main body and provided at substantially equal intervals in the circumferential direction;
A second yoke coupling portion formed by an opposing circumferential end portion of the adjacent second yoke radial projecting portion and an outer circumferential surface of the second yoke body, and having an axial length Lb; Have
The second yoke radial projecting portion of the second yoke is inserted into the first yoke coupling portion of the first yoke, and at the same time, the second yoke coupling portion of the second yoke. By inserting the first yoke radial projecting portion of the first yoke, the first yoke and the second yoke are fitted together along the axial direction so that the yoke is The permanent magnet type rotating electric machine according to claim 1, wherein the permanent magnet type rotating electric machine is formed. Wherein the length La of the first yoke main body and the axial direction of the first yoke connecting portion, and the length Lb of the second yoke main body and the axial direction of the second yoke connecting portion, the axis of the yoke The length Lc in the direction is
La + Lb = Lc
The permanent magnet type rotating electric machine according to claim 6 , wherein the relationship is satisfied. A gap having a predetermined circumferential dimension is formed between the first yoke radial projecting portion of the first yoke and the second yoke radial projecting portion of the second yoke. The permanent magnet type rotating electric machine according to claim 6 or 7, wherein It is a manufacturing method of the permanent magnet type rotating electrical machine according to claim 6,
The main magnet is mounted on the first yoke radial projecting portion of the first yaw click,
The auxiliary magnet is mounted on the second yoke radially projecting portion of the second yaw click,
After a second yaw click and the first yaw click by fitting along the axial direction to form the yoke, permanent magnets, characterized that you fixed by inserting the shaft into the yoke A manufacturing method of a rotary electric machine. After adjusting the circumferential position of the first yoke and the second yoke until the harmonic component of the magnetic flux density distribution of the air gap after assembly of the rotor is minimized , the shaft is inserted into the yoke. manufacturing method of a permanent magnet rotating electrical machine according to claim 9 to the fixed to said isosamples. Wherein the first yoke, the second yoke, said shaft and a manufacturing method of a permanent magnet rotating electrical machine according to claim 9 or 10, fixed to said Rukoto press fit or shrink in fitting.

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