JP5549413B2 - Magnetization method, magnetization apparatus, and method of manufacturing rotating electrical machine - Google Patents

Description

  The present invention relates to a magnetization method, a magnetization apparatus, and a method for manufacturing a rotating electrical machine.

  The magnetizing yoke of Patent Document 1 has a magnetizing coil and a winding groove in accordance with the number of magnetic poles of a ring-type polar anisotropic magnet of a rotor (rotor). This magnetizing yoke has a winding groove so as to straddle the upper and lower magnetic poles of a ring-type polar anisotropic magnet to which a step-like skew (step skew) is applied. The coil winding is inclined obliquely from the rotation axis of the rotor. The ring-type polar anisotropic magnet is magnetized by energizing the oblique coil winding inserted through the winding groove.

JP 2002-153024 A

  In the case of built-in magnetization in which the magnet is magnetized in the rotor, it is known that the position of the magnetizing current in the circumferential direction of the rotor (the position of the center of the magnetizing magnetic field) greatly affects the magnetization result. ing. In the above-described oblique coil winding, the circumferential position of the magnetizing current and the circumferential center position of the magnet pair greatly deviate at the stepped skewed magnet interface. For this reason, in the oblique coil winding, there is a problem that the magnetizing performance (magnetization) to the magnet does not reach the specified value at the portion of the magnet away from the coil winding.

  The present invention has been made paying attention to such conventional problems, and an object thereof is to provide a magnetization method with improved magnetization performance.

A magnetizing method according to an aspect of the present invention is a magnetizing method of a rotor including a first rotor and a second rotor arranged in series in the rotation axis direction. The magnetization method includes a step of disposing a plurality of unmagnetized magnets at predetermined angular intervals in the circumferential direction so that the circumferential positions of the first rotor and the second rotor are shifted between the rotors. In addition, the magnetizing method includes a first circumference between a first circumferential center of magnets adjacent in the first rotor and a second circumferential center of magnets adjacent in the second rotor. It includes a first magnetization step in which magnetization is performed by flowing a magnetization current at the direction magnetization position. Further, in the magnetization method, a magnetization current is passed between the first and second circumferential centers at a second circumferential magnetization position different from the first circumferential magnetization position. Including a second magnetization step to be performed. The first and second circumferential magnetization positions are centered on the first and second circumferential centers, and the first circumferential magnetization position is relative to the reference angle. And the second circumferential magnetization position is on the second circumferential center side with respect to the reference angle.

  ADVANTAGE OF THE INVENTION According to this invention, the magnetization method which improved the magnetization performance can be provided, and it can prevent that magnetization becomes small in the part of the magnet provided in the rotor.

(A) It is a schematic perspective view of the rotor which magnetizes in 1st embodiment. (B) It is an end view of the rotary electric machine which concerns on 1st embodiment. (A) A magnetizing device used for magnetizing. (B) It is a figure which shows the state which the magnetizing yoke (coil winding) of the magnetizing apparatus rotated relatively with respect to the rotor. It is sectional drawing of the rotor which shows the magnetization process in 1st embodiment. (A) It is a figure which shows the condition where a reverse pole arises. (B) It is an enlarged view which shows the magnet in which the reverse pole produced. It is a schematic side view which shows an example of the rotor which magnetizes in 2nd embodiment. It is sectional drawing of the rotor which shows the magnetization process in 2nd embodiment. It is a schematic side view which shows another example of the rotor which magnetizes in 2nd embodiment. It is a schematic side view which shows another example of the rotor which magnetizes in 2nd embodiment. It is sectional drawing of the rotor which shows the magnetization process in 3rd embodiment. (A) In 3rd embodiment, it is a magnetization curve which shows the 1st magnetization of a lower stage magnet. (B) In 3rd embodiment, it is a magnetization curve which shows the 2nd magnetization of a lower stage magnet. (C) In 3rd embodiment, it is a magnetization curve which shows the 3rd magnetization of a lower stage magnet. (D) In 3rd embodiment, it is a magnetization curve which shows the 1st magnetization of an upper stage magnet. (E) In 3rd embodiment, it is a magnetization curve which shows the 2nd magnetization of an upper stage magnet. (F) In 3rd embodiment, it is a magnetization curve which shows the 3rd magnetization of an upper stage magnet. It is sectional drawing which shows the other example of the rotor which magnetizes. It is a prior art magnetized yoke.

  Hereinafter, embodiments for carrying out the present invention will be described in more detail with reference to the drawings.

<First embodiment>
With reference to FIGS. 1-4, the magnetization method which concerns on 1st embodiment is demonstrated.

  FIG. 1A is a schematic view of a rotor 10 that is magnetized. As shown in FIG. 1B, after the rotor 10 is magnetized, it is combined with a stator (stator) 11 to be rotatable so as to constitute a motor (rotary electric machine) 13. The rotor 10 includes a plurality of rotors (lower rotor 10a and upper rotor 10b) having substantially the same shape arranged in series in the rotation axis direction of the rotor 10. Each rotor is attached to the rotating shaft 16. The lower rotor 10a and the upper rotor 10b have unmagnetized magnets (permanent magnets) 14a and 14b, respectively. The lower rotor 10a and the upper rotor 10b may be referred to as a first rotor and a second rotor, respectively.

  A stepped skew is applied to the magnets of different rotors. The magnet 14a of the lower rotor 10a and the magnet 14b of the upper rotor 10b are shifted from each other by a skew angle θ in the circumferential direction. In the present specification, the skew angle θ is defined as a circumferential shift angle (or displacement angle) between magnets of adjacent rotors.

  In FIG. 1, only one magnet is shown for each rotor for convenience, but each rotor actually has a plurality of magnets. Specifically, magnet insertion holes 38 are formed at predetermined angular intervals in the circumferential direction in the outer peripheral region of each rotor. In the magnet insertion hole 38, a plurality of unmagnetized magnets (permanent magnets) coated with an adhesive are inserted in the rotation axis direction. Accordingly, in each rotor, a plurality of unmagnetized magnets are arranged at predetermined angular intervals in the circumferential direction.

  FIG. 2A and FIG. 2B are diagrams illustrating a magnetizing device used for magnetizing. The magnetizing apparatus includes a magnetizing yoke 20, a power source 21 that supplies a magnetizing current, and a coil winding 22 that is provided in the magnetizing yoke 20 and flows the magnetizing current. The rotor 10 is installed in the magnetizing yoke 20 and magnetized. The coil winding 22 passes a current in a direction parallel to the axis of the magnetized yoke 20.

  In addition, the magnetizing apparatus includes an arrangement mechanism 24 that can arrange the coil winding 22 by rotating and moving the coil winding 22 relative to the rotor 10. The arrangement mechanism 24 may include an electric motor that can rotate and move either the magnetized yoke 20 (that is, the coil winding 22) or the rotor 10. FIG. 2B shows a state where the magnetized yoke 20 and the coil winding 22 are rotated in the circumferential direction from the state of FIG.

  When the rotor 10 to be magnetized is disposed inside the magnetizing yoke 20, the coil winding 22 is parallel to the direction of the rotation axis 16 of the rotor 10. When the magnetizing current flows through the coil winding 22, a magnetic field 26 that magnetizes the magnet is generated around the coil winding 22 (that is, around the magnetizing current) in a direction perpendicular to the rotating shaft 16. The coil winding 22 is the center of a magnetic field (magnetic field) generated in a vortex. As shown in FIG. 12, the magnetized yoke of the prior art has an oblique coil winding inclined with respect to the direction of the rotation axis 16 of the rotor 10. The magnetizing yoke of this embodiment is less expensive to manufacture than the magnetizing yoke of the prior art because the coil winding 22 does not tilt from the direction of the rotation axis 16.

  Referring to FIG. 3, in the magnetization process, with reference to the circumferential center position 36 between the circumferential center 30 of the magnet pair 16a in the lower rotor 10a and the circumferential center 32 of the magnet pair 16b in the upper rotor 10b, Each coil winding 22 of the magnetizing yoke 20 is arranged to flow a magnetizing current. The magnet pair 16a is composed of two adjacent magnets 14a and 14a '(unmagnetized) in the lower rotor 10a. The magnet pair 16b includes two magnets 14b and 14b '(unmagnetized) adjacent to each other in the upper rotor 10b. The circumferential center 30 of the magnet pair 16a and the circumferential center 32 of the magnet pair 16b are referred to as a first circumferential center and a second circumferential center, respectively.

  The magnetic field generated by applying a magnetizing current to the coil winding 22 magnetizes (magnetizes) the magnets 14a and 14a 'of the lower rotor 10a and the magnets 14b and 14b' of the upper rotor 10b so that no reverse pole is generated. To do.

  Here, if the circumferential angle of the circumferential center 30 of the lower magnet pair 16a is 0 °, the circumferential angle of the circumferential center 32 of the upper magnet pair 16b is the skew angle θ °. A center position (center angle) 36 in the circumferential direction between the center 30 and the center 32 becomes a reference angle (reference phase) α. Here, the reference angle α is θ / 2.

  In the magnetization process, the arrangement mechanism 24 arranges the coil windings 22 at a plurality of different positions within a range 35 of ± Xmax in which no reverse pole is generated around the reference angle α, and the magnetizing current is magnetized (magnetized). Repeat several times. That is, in a plurality of times of magnetization, the circumferential phase φ (circumferential angular position) of the coil winding 22 is in a range 35 in which a reverse pole from α−Xmax to α + Xmax does not occur (that is, α−Xmax ≦ φ ≦ α + Xmax). The circumferential position of the coil winding 22 is the circumferential position of the magnetizing current.

  The case where the magnetization is performed twice will be described. In the first magnetization process, the arrangement mechanism 24 sets the coil winding 22 (magnetization current) as the first circumferential magnetization position 31 and the phase φ = α−. Set to the X position. In the present embodiment, the first circumferential magnetization position 31 is between the reference angle α and the circumferential center 30 of the lower magnet pair 16a. In the second magnetization process, the arrangement mechanism 24 sets the coil winding 22 (magnetization current) as the second circumferential magnetization position 33 at a position of phase φ = α + X. In the present embodiment, the second circumferential magnetization position 33 is between the reference angle α and the circumferential center 32 of the upper magnet pair 16b. In the first magnetizing stroke, the magnetizing current approaches the lower magnet pair 16a, and in the second magnetizing stroke, the magnetizing current approaches the upper magnet pair 16b. For this reason, it is possible to prevent the portion of the magnet that is far away from the magnetizing current in either magnetizing stroke from being reduced, and to reduce the magnetization in the portion of the magnet.

  Here, the circumferential width X of the coil winding 22 is Xmax or less (X ≦ Xmax). In order to maximize the effective magnetization (effective magnetization) in a range where no reverse pole is generated in the magnets of the lower rotor 10a and the upper rotor 10b, it is preferable that X = Xmax.

  The circumferential angular interval (2X) between the first circumferential magnetized position 31 and the second circumferential magnetized position 33 is substantially equal to the skew angle (shift angle) θ of the magnet between the lower rotor 10a and the upper rotor 10b. You may make it proportional. For example, when the skew angle θ is within 10 ° (0 ° ≦ θ ≦ 10 °), X is about θ / 6 and the angle interval (2X) is about θ / 3. For example, if the skew angle θ is 3.75 °, X is 0.625 °.

When performing 2n times magnetization is deployment mechanism 24, ± a coil winding 22 phase _{φ = α X 1, α ±} X 2, ···, and disposed at a position alpha ± X _n, magnetized The device is magnetized. _{However, X 1, X 2 ··· X} n is less _{Xmax (X 1, X 2,} ··· X n ≦ Xmax).

  The term “reverse pole” means that a part of the magnet is magnetized (magnetized) in a direction opposite to the intended magnetization direction, and a pole opposite to the intended pole is generated on the magnet surface. When the phase width X is larger than Xmax, the magnetizing current is separated from the center 30 of the lower magnet pair 16a in the phase (angular position) φ = α + X of the coil winding 22, so that the magnet 14a ′ of the lower rotor 10a has a reverse polarity. Occurs. When X is larger than Xmax, the phase (angular position) of the coil winding 22 is opposite, and when φ = α−X, the magnetizing current is separated from the center 32 of the upper magnet pair 16b, and therefore reverse to the magnet 14b of the upper rotor 10b. A pole occurs. 4A and 4B show a situation in which a reverse pole is generated in the magnet 14b of the upper rotor 10b. The phase width Xmax in which the reverse pole occurs depends on the arrangement of the magnets and the skew angle θ, and is obtained experimentally.

  In the above description, the reference angle α can be obtained by experimentally obtaining an angle range (φ1 to φ2) of the coil winding 22 in which no reverse pole is generated, and can be set to the central angle in the circumferential direction between the angular positions φ1 and φ2. (Α = (φ1 + φ2) / 2). In this case, Xmax is determined as α−φ1 or φ2−α.

-Action and effect-
According to the first embodiment, the magnetization method includes a plurality of unmagnetized magnets such that the circumferential position of each of the first rotor (lower rotor 10a) and the second rotor (upper rotor 10b) is shifted between the rotors. Including a step of arranging magnets in the circumferential direction at predetermined angular intervals. In addition, the magnetizing method includes a first circumference between a first circumferential center 30 of magnets adjacent in the first rotor and a second circumferential center 32 of magnets adjacent in the second rotor. A first magnetization step is performed in which magnetization is performed by flowing a magnetization current at the direction magnetization position 31. Further, the second magnetization is performed by flowing a magnetization current at a second circumferential magnetization position 33 different from the first circumferential magnetization position 31 between the first and second circumferential centers. And a process. As a result, the portion of the magnet that is far away from the magnetizing current is reduced in both magnetization steps, and it is possible to prevent the magnetization from being reduced in the portion of the magnet provided in the rotor. Further, the magnet can be magnetized after the non-magnetized magnet is incorporated into the rotor so as to have the same effective magnetization as that obtained when the magnet is magnetized before being incorporated into the rotor.

  With the circumferential center 36 of the first and second circumferential centers as the circumferential reference angle α, the first circumferential magnetization position 31 is on the first circumferential center 30 side with respect to the reference angle α. The second circumferential magnetization position 33 is on the second circumferential center 32 side with respect to the reference angle α. For this reason, it can prevent that magnetization becomes small more effectively in the part of a magnet.

  The angular interval in the circumferential direction between the first circumferential magnetization position 31 and the second circumferential magnetization position 33 is proportional to the magnet shift angle θ between the first rotor and the second rotor. For this reason, when the deviation angle θ is large, the circumferential position of the magnetizing current can be greatly changed to prevent the magnetization from becoming smaller at the magnet portion more effectively.

  The first circumferential magnetization position 31 and the second circumferential magnetization position 33 are within a circumferential angle range 35 where no reverse pole is generated by the magnetization current. Thereby, it can be prevented that a large magnetic field for canceling the reverse pole is required in the magnetization process. Further, it is possible to prevent the effective magnetization (average magnetization) of the magnet from decreasing due to the reverse pole.

  The magnetizing device includes a coil winding 22 that conducts magnetization by flowing a magnetizing current. Further, the arrangement mechanism 24 of the magnetizing device is between a first circumferential center 30 of magnets adjacent in the first rotor and a second circumferential center 32 of magnets adjacent in the second rotor. The coil windings 22 are arranged at a first circumferential magnetization position 31 and a second circumferential magnetization position 33 different from the first circumferential magnetization position 31. Thereby, it can prevent that magnetization becomes small in the part of the magnet provided in the rotor.

  The method for manufacturing the rotating electrical machine 13 having the stator 11 includes a step of combining the rotor 10 magnetized by the magnetizing method and the stator 11. Thereby, the rotary electric machine 13 which has the rotor 10 which improved the effective magnetization of the magnet can be provided.

<Second embodiment>
The second embodiment relates to the case where the rotor 40 has three (three) or more rotors arranged in series in the rotation axis direction.

  FIG. 5 is a side view showing an example of a rotor having a three-stage rotor. The rotor 40 includes three stages of rotors (the lowermost rotor 40a, the middle rotor 40b, and the uppermost rotor 40c) having substantially the same shape arranged in series in the rotation axis direction. Each rotor is attached to the rotating shaft 16. The lowermost rotor (first rotor) 40a, the middle rotor (third rotor) 40b, and the uppermost rotor (second rotor) 40c have unmagnetized magnets 44a, 44b, and 44c, respectively.

  A stepped skew is applied to the magnets of different rotors. The magnet 44a of the lowermost rotor 40a and the magnet 44b of the middle rotor 40b are shifted from each other by a skew angle θ in the circumferential direction. The magnet 44a of the middle rotor 40a and the magnet 44b of the uppermost rotor 40b are shifted from each other by a skew angle θ in the circumferential direction. In FIG. 5, only one magnet is shown for each rotor for convenience, but each rotor actually has a plurality of magnets.

  In FIG. 6, when the circumferential angle of the circumferential center 50 of the magnet pair 46a in the lowermost rotor 40a is 0 °, the circumferential angle of the circumferential center 52 of the magnet pair 46b in the middle rotor 40b is θ °, The circumferential angle of the circumferential center 54 of the magnet pair 46c is (2θ) °. The circumferential center position (center angle) between the circumferential center 50 of the lower magnet pair 46a and the circumferential center 52 (third circumferential center) of the middle magnet pair 46b is the first predetermined angle β1 (= θ / 2 °). The circumferential center position (center angle) between the circumferential center 52 of the middle magnet pair 46b and the circumferential center 54 of the upper magnet pair 46c is the second predetermined angle β2 (= 3θ / 2 °). The central angle γ (= (β1 + β2) / 2) between the first predetermined angle β1 and the second predetermined angle β2 is the reference angle α. Here, the reference angle α is θ. As shown in FIG. 7, the reference angle α can be similarly determined even for a magnet arrangement in which the magnets of adjacent rotors are shifted in a zigzag manner in the rotation axis direction.

  FIG. 8 is a side view showing an example of a rotor having four or more stages of rotors. Here, the rotor 40 includes four or more rotors having substantially the same shape arranged in series in the rotation axis direction. In this case, for example, the reference angle α may be set at the center position (center angle) between the circumferential center of the magnet pair 46a of the lowermost rotor and the circumferential center of the magnet pair 46d of the uppermost rotor. Further, the reference angle α can be obtained by experimentally obtaining an angle range (φ1 to φ2) of the coil winding 22 in which no reverse pole is generated, and can be set to an angle between the angular positions φ1 and φ2 in the circumferential direction (α = (Φ1 + φ2) / 2). In this case, Xmax is determined as α−φ1 or φ2−α.

  As in the first embodiment, in the magnetization process, the arrangement mechanism 24 sets the coil winding 22 to a plurality of different positions within a range of ± Xmax around the reference angle α so that no reverse pole occurs. A magnetic current magnetizes (magnetizes) a plurality of times. That is, in a plurality of magnetizations, the circumferential phase φ (circumferential angular position) of the coil winding 22 is in a range from α−Xmax to α + Xmax (that is, α−Xmax ≦ φ ≦ α + Xmax).

  In the case of performing the second magnetization, in the first magnetization process, the arrangement mechanism 24 is arranged between the circumferential center 50 of the magnet pair of the lowermost rotor (first rotor) and the reference angle α. Winding 22 (magnetization current) is set at position 31 of phase φ = α−X. In the second magnetizing step, the arrangement mechanism 24 causes the coil winding 22 (magnetizing current) to have a phase φ between the circumferential center 54 of the magnet pair of the uppermost rotor (second rotor) and the reference angle α. = Set to position 33 of α + X.

  According to the second embodiment, even if the rotor has three or more stages, it is possible to appropriately prevent the magnetization from being reduced at the magnet portion.

<Third embodiment>
In the third embodiment, before the plurality of times of magnetization in the first embodiment, the coil winding 22 (magnetization current) is set to the position of the reference angle α and magnetized. Shaking the position of the coil winding 22 (magnetization current) increases the possibility that a reverse pole will occur due to manufacturing variations. Therefore, before the position of the coil winding 22 (magnetization current) is changed, the coil winding 22 (magnetization current) is set at the reference angle α and magnetized. Other configurations are the same as those in the first embodiment.

  The case where the rotor 10 having the lower rotor 10a and the upper rotor 10b in FIG. 1 is magnetized three times will be described. As shown in FIG. 9, first, the arrangement mechanism 24 sets the coil winding 22 (magnetization current) at the position 37 of the reference angle α, and the magnetization current performs the first magnetization. Thereafter, the arrangement mechanism 24 sets the coil winding 22 (magnetization current) at the position 31 of the phase φ = α−X, and the magnetization current performs the second magnetization. Further, thereafter, the arrangement mechanism 24 sets the coil winding 22 (magnetization current) at the position 33 of the phase φ = α + X, and the magnetization current performs the third magnetization. Here, the reference angle α is a circumferential central position (central angle) between the circumferential center 30 of the lower magnet pair 16a and the circumferential center 32 of the upper magnet pair 16b.

  FIGS. 10A to 10C show the magnetization curve (solid line) of the lower magnet 14a in the case of three times magnetization in correspondence with the hysteresis curve (dotted line). FIGS. 10D to 10E show the magnetization curve (solid line) of the upper magnet 14b 'in the case of three-time magnetization in correspondence with the hysteresis curve (dotted line).

  First, in the first magnetization, since the coil winding 22 (magnetization current) is arranged at the reference angle α, the lower magnet 14a and the upper magnet 14b ′ are similarly magnetized (FIG. 10 ( a) and (d)). Next, in the second magnetization, the coil winding 22 (magnetization current) is at a position of phase φ = α−X between the reference angle α and the circumferential center 30 of the lower magnet pair 16a. Therefore, the lower magnet 14a is magnetized and reaches the vicinity of the saturation magnetization (FIG. 10B). On the other hand, in the second magnetization, the upper magnet 14b 'is not so magnetized (FIG. 10 (e)). Next, in the third magnetization, the coil winding 22 (magnetization current) is set to a position of phase φ = α + X between the reference angle α and the circumferential center 32 of the upper magnet pair 16b. Therefore, the upper magnet 14b ′ is magnetized and reaches the vicinity of the saturation magnetization (FIG. 10C). On the other hand, in the third magnetization, the lower magnet 14a is hardly magnetized (FIG. 10 (f)).

  According to the third embodiment, before the phase φ of the coil winding 22 (magnetization current) is swung to the plus side and the minus side around the reference angle α, the coil winding 22 (magnetization current) is changed to the reference angle α. Is set to the position of and is magnetized. Therefore, the possibility of reverse poles due to manufacturing variations is reduced.

  The present invention is not limited to the first to third embodiments described above, and it is obvious that various modifications can be made within the scope of the technical idea.

  For example, the magnetization methods of the first to third embodiments described above can be applied to a rotor having a plurality of rotors having a magnet arrangement as shown in FIG. In FIG. 11, each rotor includes a magnet 60 disposed at a predetermined angle radially outward and a magnet 62 disposed in a V shape at a predetermined angle radially inner. In this case, if the installation angle σ with respect to the radial direction of the magnet 62 arranged in a V shape is small, a reverse pole is likely to occur at the position indicated by the dotted line in FIG. For this reason, the swing width X of the circumferential phase of the coil winding 22 may be determined according to the installation angle σ of the magnet 62 arranged in a V shape. For example, the swing width X decreases as the installation angle σ decreases. As a result, even in the magnet arrangement as shown in FIG. 11, the swing width X can be determined appropriately within a range where no reverse pole occurs.

10 Rotor 10a First rotor (lower rotor)
10b Second rotor (upper rotor)
14a, 14a ′ First rotor magnets 14b, 14b ′ Second rotor magnets 16a, 16b Magnet pair 20 Magnetization yoke 22 Coil winding 24 Arrangement mechanism 30 First circumferential center 31 First circumferential magnetization position 32 Second circumferential center 33 Second circumferential magnetization position

Claims (7)

A method for magnetizing a rotor including a first rotor and a second rotor arranged in series in a rotation axis direction,
Arranging a plurality of unmagnetized magnets at predetermined angular intervals in the circumferential direction so that the circumferential position of each of the first rotor and the second rotor is shifted between the rotors;
Magnetized at a first circumferential magnetization position between a first circumferential center of adjacent magnets in the first rotor and a second circumferential center of adjacent magnets in the second rotor. A first magnetization step in which current is applied to magnetize,
A second magnetization step in which magnetization is performed by passing a magnetization current at a second circumferential magnetization position different from the first circumferential magnetization position between the first and second circumferential centers; , only including,
With the center of the first and second circumferential centers as a reference angle in the circumferential direction, the first circumferential magnetization position is on the first circumferential center side with respect to the reference angle, and the first A second circumferential magnetization position on the second circumferential center side with respect to the reference angle;
A magnetizing method characterized by the above. 2. The magnetization method according to claim 1 , further comprising a step of performing magnetization by flowing a magnetization current at the position of the reference angle before the first magnetization step and the second magnetization step. . The rotor includes a third rotor arranged in series in the rotation axis direction between the first and second rotors,
In the magnetizing method, a plurality of unmagnetized magnets of the third rotor are arranged at predetermined angular intervals in the circumferential direction so that the circumferential positions are shifted with respect to the plurality of magnets of the first and second rotors. Comprising the steps of:
When the circumferential center of the magnet adjacent in the third rotor is the third circumferential center, the reference angle is the center between the first and third circumferential centers, and the second The magnetization method according to claim 1 , wherein the magnetization angle is a central angle with respect to the center between the third circumferential centers.   A circumferential angle interval between the first circumferential magnetization position and the second circumferential magnetization position is proportional to a magnet shift angle between the first rotor and the second rotor. The magnetization method according to claim 1.   2. The magnetization according to claim 1, wherein the first circumferential magnetization position and the second circumferential magnetization position are within a circumferential angle range in which a reverse pole is not generated by a magnetization current. Method. A method of manufacturing a rotating electrical machine having a stator,
The manufacturing method of the rotary electric machine including the process of combining the rotor magnetized by the magnetization method of Claim 1, and the said stator. A first rotor and a second rotor arranged in series in the rotation axis direction, and a plurality of unmagnetized magnets are respectively arranged at predetermined angular intervals in the circumferential direction so that the circumferential position is shifted between the rotors. A magnetizing device for magnetizing a rotor comprising a first rotor and a second rotor,
A coil winding for magnetizing by passing a magnetizing current;
A first circumferential magnetization position between a first circumferential center of magnets adjacent in the first rotor and a second circumferential center of magnets adjacent in the second rotor; An arrangement mechanism for arranging the coil winding at a second circumferential magnetization position different from the first circumferential magnetization position ;
With the center of the first and second circumferential centers as a reference angle in the circumferential direction, the first circumferential magnetization position is on the first circumferential center side with respect to the reference angle, and the first A second circumferential magnetization position on the second circumferential center side with respect to the reference angle;
The arrangement mechanism arranges the coil winding at the second circumferential magnetization position by a step different from the arrangement of the coil winding at the first circumferential magnetization position.
A magnetizing apparatus characterized by that .

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