JPH09163692A - Magnetizer for rotating-field type permanent magnet synchronous motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetizer for magnetizing each pole of an unmagnetized magnet having high remanent magnetic flux density and high coercive force after it is mounted on a rotor without increasing the size of current supply for magnetization. SOLUTION: The magnetizer 8a comprises a magnetization unit 6a where a plurality of cores 5 (51a-54a), each having a width equal to one half that of pole of different polarity split by adjacent through holes 21-24 on the opposite sides of a slot 3 and applied with a coil 30 passing through the slot 3 while reversing the winding direction, are arranged in the circumferential direction on the outer circumference of a permanent magnet 2 in a rotor 1, and a current supply 7. The coil 30 of each pole core 5a is fed with a pulse current from the current supply 7 through a switch 60 thus magnetizing the permanent magnet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a magnetizing device for magnetizing unmagnetized permanent magnets of a rotary field type permanent magnet synchronous motor in which permanent magnets are mounted on a rotor to form field poles.

[0002]

6 to 8 show a magnetizing device for forming a field pole of a rotor of a conventional rotating field type permanent magnet synchronous motor, and FIG. 6 constitutes the magnetizing device. A magnetizer,
FIG. 7 is a perspective view of a rotor mounted with an unmagnetized permanent magnet before being inserted into the magnetizer, FIG. 7 is a configuration diagram of a magnetizing device for magnetizing the permanent magnet of the rotor inserted into the magnetizer, and FIG. (A) And (b) is explanatory drawing of the principle of magnetization of a permanent magnet, respectively. Since a permanent magnet synchronous motor that uses permanent magnets for the field poles of the rotor can make the field strength almost constant, it supplies a variable frequency power to the armature winding of the stator to generate a rotating magnetic field. By generating it, it is possible to obtain a highly efficient rotor in which the rotational speed of the rotor can be precisely controlled and varied. Moreover, since the excitation unit does not require a power supply as a non-excitation by the permanent magnet as described above, it is possible to reduce the size of the equipment and to reduce the maintenance management. As a rotating machine, it is mainly applied to small and medium capacity machines.

By the way, the permanent magnet does not normally have a magnetic force at the molding stage, but it has a performance as a magnet by so-called magnetization or magnetization, which is a force to externally generate a magnetomotive force. A device that magnetizes this unmagnetized permanent magnet is called a magnetizing device or a magnetizing device. In the rotating field type permanent magnet synchronous motor, the magnetizing method for magnetizing the unmagnetized permanent magnets forming the field poles of the rotor is as shown in the case of the four poles in FIG. Four coils wound by being inserted into a groove 3 axially provided concentrically with the rotor 1 so as to face the outer circumference of an unmagnetized permanent magnet 2 provided on the outer circumference. 4 and a magnetizer 6 composed of a four-pole magnetic pole core 5 supporting the coil 4, and a current supply device 7 for supplying a current to the coil 4 of the magnetizer 6. This is performed by inserting the rotor 1 inside the magnetizer 3.

The current flowing through the coil 4 for magnetizing the permanent magnet 2 may be a large current for a relatively short time. Therefore, a normal LC resonance type pulse power source is used as shown in FIG. . Magnetization of the permanent magnet 2 is performed by first supplying a current flowing through four coils 4 wound around respective magnetic pole cores 5 for generating magnetic flux for forming permanent magnets 2 in four poles and connected in series. The discharge switch 9 of the device 7 is opened and cut off. Next, the switch 10 is closed and the charging circuit 11 charges the capacitor 12 from the power supply 11a. After charging to a predetermined voltage, the switch 10 is opened and then the discharge switch 9 is closed, so that the current from the charging circuit 11 is wound around the same iron core 5 of the magnetizer 6 described above. 4 to generate a magnetic flux 13. here,
When the capacitance of the capacitor 12 of the current supply device 7 is C, the resistance of the coil 4 of the magnetizer 6 is R, and the inductance is L, the current supply device 7 is satisfied when the condition of R <2√ (L / C) is satisfied. The current 14 flowing from the coil 4 to the coil 4 exhibits a damped oscillation waveform as shown in FIG. 8A, and a very high steeple value can be obtained in the first period. On the other hand, the permanent magnet 2
8 (b) shows an inherent hysteresis curve 15 depending on the constituent material. Due to the strong magnetic flux 13 generated by the current 14, the magnetic saturation region 16 immediately reaches the magnetic saturation region 16 and the hysteresis disappears when the current disappears. Curve 15
The residual magnetic characteristics 17 according to the above, and corresponding to the magnetic flux direction determined by the current direction of the arrow flowing through the permanent magnets 2 facing the four coils 4 after completing the magnetization. As shown in FIG. 7, a 4-pole field pole is formed.

By the way, in magnetizing the permanent magnets of the rotating field permanent magnet synchronous motor by the magnetizing device 8 including the magnetizer 6 shown in FIG. 7, it is important to magnetize all poles at the same time. That is, in the same manner as described above, in the four-pole magnetic pole configuration, as shown in FIG.
As described above, current is supplied from the current supply device 7 to the two coils 4 and 4 wound by changing the winding direction on the adjacent magnetic pole cores 5 and 5 to generate magnetic flux, and the S pole and N pole are attached. When magnetized, the direction of the magnetic flux 18 does not go in the normal direction of the permanent magnet 2, and the magnetization direction of the magnetized permanent magnet 2 also tilts,
Further, the distribution of the magnetic flux 18 becomes non-uniform, and there is a possibility that an unsaturated region 19 that is not sufficiently saturated is formed. In magnetizing the permanent magnet 2 of the rotor 1, it is important to completely saturate, and if the saturation is not perfect, permanent demagnetization may occur when a reverse magnetic field is applied from the outside such as the stator side. In the structure of the magnetizer 6 shown in FIGS. 5 and 6 described above,
It is an indispensable condition to magnetize all poles of the field pole at the same time.

[0006]

Recently, a permanent magnet having a high coercive force has been developed. Especially, the application of a permanent magnet synchronous motor using a rare earth magnet has been expanded, and it has been applied to a large-sized large-capacity machine. Application development is also underway. Therefore, a magnetizing device for a permanent magnet is required to have a high magnetizing ability for magnetizing a permanent magnet having a higher residual magnetic flux density. However, in the above-described conventional magnetizing device that magnetizes all poles of the permanent magnet at the same time, it is necessary to pass a large current through the coil in order to generate magnetic flux, and the current supply device 7 also becomes large in size. There was a problem that the magnetic cost increased. Therefore, in a rotor structure in which a large permanent magnet is mounted, a method of magnetizing the permanent magnet and then attaching the permanent magnet to the rotor to form a field pole is generally performed. The configuration of the field poles of this rotor requires very careful handling and a special jig for the mounting positioning jig, etc., in order to mount the already magnetized one on the outer circumference of the rotor, which is an iron member. It requires complicated work.

An object of the present invention is to form a field pole composed of a permanent magnet having a large residual magnetic flux density and a high coercive force, which solves the above-mentioned problems, by mounting it on a rotor after magnetizing as in the conventional case. It is an object of the present invention to provide a magnetizing device capable of magnetizing each pole after mounting an unmagnetized permanent magnet on a rotor without needing to increase the size of a current supply device.

[0008]

In order to solve the above-mentioned problems, the magnetizing device of the present invention has an N-pole and an S-pole which are alternately arranged and are formed on the circumference of a permanent magnet of a rotor by magnetization. Each magnetic pole is divided into two at the center, and half of the adjacent magnetic poles
To magnetize the combination of poles as a unit,
A magnetizer is constructed by arranging magnetic pole cores, which are divided into left and right coils and wound in opposite directions to face each other in the circumferential direction of the rotor, and a pulse shape is applied to the coil of this magnetizer from a current supply device. The magnetic flux is generated by passing the current pulse of (1) and the permanent magnet is magnetized.

As a result, a plurality of magnetic pole cores, each of which is divided into two parts of the above-mentioned magnetizer and each of which is wound with a coil, are arranged facing the outer circumference of the unmagnetized permanent magnet according to the number of magnetic poles of the rotor, and the By passing a pulsed current from the supply device to the coils of the plurality of magnetizers while sequentially switching it, it is possible to magnetize all the poles at the same time as in the magnetizing device. Moreover, as compared with the conventional magnetizing device that magnetizes all poles at the same time, all the poles can be magnetized by the current supply device that magnetizes one pole as described above, so that the capacity of the capacitor of the current supply device can be reduced. Since the number of magnetic poles can be reduced in inverse proportion to the number of magnetic poles, the magnetizing device can be a current supply device having a small power supply capacity.

Further, the magnetizer is divided into left and right by the through hole, and the magnetic pole iron core around which the coil is wound is formed by arranging one set or two sets facing each other on the outer circumference of the unmagnetized permanent magnet. Then, the magnetic pole core or the rotor is rotationally moved to the magnetic pole position formed by the magnetization of the permanent magnets on the circumference of the rotor so that the position of the magnetic pole core of the magnetizer matches the position of the magnetic pole of the rotor. , In order to magnetize all the conventional poles at the same time, the inductance of the coil wound around the magnetic pole core of the magnetizer can be magnetized at the same time by using a magnetizing device equipped with a positioning means for magnetizing the magnet in multiple times. In comparison with a magnetizing device consisting of a magnetizer, which requires as many magnetic pole cores as the number of magnetic poles, the value divided by the number of magnetic poles in the case of one set of magnetic poles, or twice the value in the case of two sets. Since it can be set to a value, it is assumed that the magnetizing device has a small magnetizer. It is possible.

Further, a first magnetizer in which magnetic pole cores of the magnetizer are arranged at intervals of one pole on the circumference of the rotor, and a magnetic pole core position of the first magnetizer in the circumferential direction. A second magnetizer arranged on the circumference of the rotor at a position offset by one pole interval is concentrically arranged at an axial interval, and an unmagnetized permanent magnet is mounted. First mentioned above for rotor
And a magnetizing device having means for axially moving and positioning the second magnetizer. As a result, by switching and connecting the pulsed currents from the current supply device between the first and second magnetizers, and magnetizing the permanent magnets at the positions corresponding to the respective magnetic pole iron cores, The power supply capacity can be reduced as compared with a current supply device of a magnetizing device that magnetizes all poles at the same time.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. First Embodiment FIG. 1 is a configuration diagram of a magnetizing device for a rotating field permanent magnet synchronous motor according to a first embodiment of the present invention. The rotor field magnetic pole of FIG. 1 is a four-pole configuration example, and the magnetic pole core 5a that constitutes the magnetizer 6a of the magnetizing device 8a is the N pole or S pole formed on the permanent magnet 2 mounted on the rotor 1. Four magnetic pole cores 51a, 52a, 53a, 54a divided by the groove 3 are arranged on the outer periphery of the rotor 1 at positions corresponding to the poles. And each magnetic pole core 5a is
A through hole 20 (21, 21,
2, 23, 24) are provided to divide the magnetic pole core 5 into two parts. Then, the coil 30 is penetrated through the through hole 20 of the magnetic pole core 5, and the coil 30 is wound around each of the two magnetic pole cores 5 divided into the left and right. Next, as shown in FIG. 1, four magnetic flux generating circuits 40 (41, 4) are connected by connecting the coils 30 wound around the adjacent 1/2 poles of different polarities via the groove portion 3.
2, 43, 44).

The current pulse flowing through the magnetic flux generating circuit 40 is supplied from the power source 11a of the current supply device 7 to the charging circuit 1.
The current charged by 1 is supplied by closing the discharge switch 9 as described in the conventional example. In this case, the contact wire connected to the magnetic flux generating circuits 41 to 44 formed of the coil 30 wound around the magnetic pole iron core 5a of the magnetizer 6a forming four magnetic poles in the permanent magnet 2 is connected to the contact wire 4
1a, 41b to 44a, 44b switch 60
By switching the contact point 61 of each of the magnetic poles 5 and sequentially passing a pulsed current from the current supply device 7, the permanent magnets 2 corresponding to the magnetic pole cores 5a are magnetized to have 1/2 poles of different poles. Then magnetize all poles.

In the first embodiment of the present invention, two circuits of the magnetic flux generating circuit 40 can be connected in series or in parallel when the power supply capacity of the current supply device 7 has a margin, and the existing circuit can be installed. Magnetic flux generating circuit 40 according to the current supply device 7
Can be selected. Further, this embodiment is suitable for magnetizing a rotating magnetic field type permanent magnet synchronous motor having a wide magnetic pole width and a small number of poles.

Second Embodiment FIG. 2 is a block diagram of a magnetizing device for a rotating field permanent magnet synchronous motor according to a second embodiment of the present invention. Magnetic pole core 5b constituting the magnetizer 6b of the magnetizer 8b shown in FIG.
Is a magnetic pole core 51b divided into two by a groove portion 3 provided in the axial direction having a magnetic pole width of 1/2 pole to the magnetic pole center of each of the adjacent N and S poles of the magnetized permanent magnet 2. 5
2b and penetrates through the groove 3 to form the magnetic pole core 5
A coil 30b is wound around 1b and 52b with their winding directions reversed. Positioning means 62 for the rotor 1 is provided for changing the relative position between the magnetic pole core 5b of the magnetizer 6b and the magnetized permanent magnet 2 for positioning.

The above-mentioned positioning means 62 is a driving machine 62.
The rotor shaft 64a, which is directly connected to the center of the rotor 1 that engages with the rotating shaft 63a of a, is rotated by the rotation of the rotating machine 62a. To magnetize the permanent magnet 2,
First, as shown in FIG. 2, a portion A of the permanent magnet 2 of the rotor 1 is arranged so as to face the magnetic pole core 5b of the magnetizer 6b, and the contact 61a of the changeover switch 60a from the current supply device 7 is closed to close the magnetic pole. Coil 30 wound around the iron core 5b
A pulsed current is passed through b in the direction of the solid arrow. As a result, depending on the direction of the current flowing in each coil of the magnetic pole cores 51b and 52b divided into two, the S pole and the N pole are magnetized to the right and left by 1/2 poles with the groove portion 3 as the boundary between the magnetic poles as shown in the figure.

Next, the driving machine 62a of the positioning means 62 is rotated to move the rotor 1 in the counterclockwise direction as indicated by the arrow by the circumference of one pole of the magnetic pole core 5b, so that the B of the permanent magnet 2 is moved. The part is positioned corresponding to the position of the pole core 5b and fixed by a fixing jig (not shown). The magnetization of the B portion of the permanent magnet 2 is performed by closing the contact 61b of the changeover switch 60a and reversing the magnetization of the A portion of the permanent magnet 2 in the coil 30b. Pulse current is passed in the direction of the dotted arrow. As a result, the unmagnetized ½ pole adjacent to the right of the above-mentioned portion A of the permanent magnet 2 is magnetized to the N pole, so that the N pole and one pole can be formed. Thereafter, the driving machine 62a is rotated to move one pole by one pole, and the pulse current is switched from the current supply device 7 to flow through the magnet to sequentially magnetize portions C and D. As described above, A and C of the permanent magnet 2 are
Since the combination of the S pole and the N pole and the combination of the B and D are the N pole and the S pole, the magnetization of each pair is changed over by the changeover switch 60a.
The magnetization direction is reversed by reversing the direction of the pulse current from the current supply device 7. In the second embodiment,
Although the magnetized portion of the permanent magnet 2 was aligned with the magnetic pole iron core 5b by rotating the rotor 1, the magnetizer 6b provided with the magnetic pole iron core 5b was rotated to the magnetized position of the permanent magnet 2. It can also be performed by positioning and fixing.

Third Embodiment FIG. 3 is a block diagram of a magnetizing device for a rotating field type permanent magnet synchronous motor according to a third embodiment of the present invention. The magnetizing device 8c shown in FIG. 3 corresponds to the magnetizer 6 of the second embodiment.
The magnetic pole core 5b around which the coil 30b forming the S pole and the 1/2 pole of the N pole of b is wound, and the 1/2 pole of the N pole and the S pole opposite to the magnetization direction of the magnetic pole of the magnetic pole core 5b. From a magnetizer 6c provided with two sets of magnetic pole cores, that is, a magnetic pole core 51c and a magnetic pole core 5c formed by winding the coil 30c into two magnetic pole cores 51c and 52c so as to be formed so as to face the magnetic pole core 5b in the circumferential direction. The field pole of the rotor shown in FIG. 3 constitutes 6 poles. That is, the magnetizer 6c is constructed by vertically arranging the magnetic pole cores 5b and 5c, and the coil 30 wound around the magnetic pole cores 5b and 5c.
b and 30c are connected in series and connected to the current supply device 7.

As shown in FIG. 3, the permanent magnet 2 is magnetized by the magnetizing device 8c according to the third embodiment. As shown in FIG. 3, the magnetic poles are located so as to face the respective portions A and A'of the permanent magnet 2. By supplying a pulsed current simultaneously from the current supply device 7 to the iron cores 5b and 5c, the magnetic pole iron cores 5b and 5
The magnetic fluxes flowing through the magnetic pole cores 51b and 52c facing each other with c are the same, and the magnetic flux directions of the magnetic pole cores 52c and 51c are opposite to those of 51b and 52c. As a result, in the permanent magnet 2 described above, at the portion A, in the case of FIG. 3, a half pole of the S pole and the N pole, and at the portion A'at the symmetrical position with A is the N pole and the S pole. 1 / of
Two poles are magnetized.

Next, the drive unit 62 of the positioning means 62a rotates the rotor shaft 64a through the rotary shaft 63a to rotate the rotor 1 in the direction of the arrow of 120 °, and in the same manner as described above, the current supply device 7 is used. A current pulse is passed through the coils 30b and 30c to magnetize B and B'of the permanent magnet 2 into 1/2 poles of S poles and N poles and 1/2 poles of N poles and S poles. To do. Further, the permanent magnet 2 is rotated by 120 ° and the portions C and C ′ of the permanent magnet 2 are magnetized in the same manner as described above, so that all poles are magnetized. In the third embodiment, the magnetic pole core 5b of the magnetized portion of the permanent magnet 2 is the same as in the second embodiment.
And 5c can be aligned by rotating the magnetizer 6c provided with the magnetic pole iron cores 5b and 5c. Also,
The third embodiment of the present invention is a system which does not require switching of the direction of the current from the current supply device 7 at the time of magnetization as in the second embodiment, and has a large number of poles of 6 or more. Suitable for magnetizing children.

Fourth Embodiment FIGS. 4 and 5 are configuration diagrams of a magnetizing device for a rotating field permanent magnet synchronous motor according to a fourth embodiment of the present invention. FIG. 4 is a cross section of the magnetizer. 5 and 5 are views taken along arrows V ₁ and V ₂ of FIG. 4. As shown in FIG. 4, Embodiment 4 of the present invention
The magnetizing device 8d is configured by concentrically fixing the magnetizer 6d and the magnetizer 6e to the support member 70 with a gap in the axial direction. The rotor 1 is axially fastened and fixed by shafts 80a and 80b coupled to the fixing member 71 at both ends in the axial direction, and the rotor 1 is moved by the movement of the supporting member 70 in the axial direction. It is configured to fit inside the magnetizers 6d and 6e. The movement of the support member 70 is such that the screw portion 7 that engages with the screw portion 91 provided on the shaft of the driving machine 90 fixed on the fixing member 71.
0a is provided on the support member 70, and the driving machine 90 is rotated.

The magnetizing device 8d shown in the fourth embodiment is
Four field poles are formed in the rotor, and as shown in FIG. 5, the magnetizer 6d has 1/2 poles of N pole and S pole, respectively, as described in the third embodiment. A magnetic pole core 5e in which coils 30e and 30f are wound around the two-divided magnetic pole core through the groove portion 3 with the winding directions reversed.
And 5f are connected in series with the coils 30e and 30f, and are arranged in the circumferential direction at intervals of one pole on the circumference of the rotor. Then, the magnetizer 6e has magnetic pole cores 5e and 5f of the magnetizer 6d, which are adjacent to the magnetic pole cores 5e and 5f of the magnetizer 6d at positions adjacent to each other by one pole interval in the circumferential direction. The magnetic pole cores 5e and 5f of the magnetizer 6d are arranged to have the same poles as the divided magnetic pole cores.
The coil 30e and the coil 30f that are wound around are provided with magnetic pole cores 5g and 5h having coils 30g and 30h that are wound in opposite directions.

The permanent magnet 2 of the rotor 1 is magnetized by the magnetizers 6d and 6e of the magnetizing device 8d having the above-described structure.
First, at the position where the rotor 1 is fitted in the magnetizer 6d,
The contact 31e and the contact 31f are closed from the current supply device 7 by the changeover switch 60b, a pulse current is passed through the coils 30e and 30f, and the permanent magnets 2 located on the magnetic pole iron cores 5e and 5f are arranged as shown in FIG. The N pole and the S pole are magnetized by 1/2 pole. Next, the driver 90 is rotated to move and fix the rotor 1 in the magnetizer 6e. Then, the contacts of the changeover switch 60b are set to 31g and 31h.
By switching to the side and passing a pulsed current from the current supply device 7 to the coils 30g and 30h, and ½ poles of the S pole and the N pole of the unmagnetized permanent magnet 2 in the magnetizer 6d, respectively. It is magnetized to form a field pole composed of a four-pole permanent magnet. The magnetizing device 8d according to the fourth embodiment does not need to rotate the rotor 1 for magnetizing when all the magnetic poles are magnetically poled, as in the above-described embodiment, and thus can be used as a rotor of a large machine. It is convenient for magnetization.

[0024]

As described above, in the present invention, the magnetizing device of the rotating field permanent magnet synchronous motor is composed of the N poles arranged alternately on the circumference of the permanent magnet of the rotor. Each of the S poles is divided into two in the center, and the coils are divided into left and right so as to be magnetized with a combination of 1/2 poles of adjacent magnetic poles as a unit, and the coils are wound in reverse. The magnetic pole iron cores are arranged so as to face each other in the circumferential direction of the rotor to form a magnetizer, and a current pulse is passed from a current supply device to a coil arranged in the magnetizer, and the above-mentioned N pole, S pole, and The S pole and the N pole are arranged to be sequentially magnetized for each 1/2 pole. This makes it possible to reduce the power supply capacity of the current supply device as compared with a conventional magnetizing device that magnetizes all poles of the rotor at the same time, and to reduce the number of turns of the coil wound around the magnetic pole core of the magnetizer. can do.

That is, the magnitude of the current flowing from the current supply device to the coil wound around the magnetic pole iron core during magnetization is
It is determined by the capacity of the capacitor charged from the power supply, and this capacitor occupies most of the inner volume of the magnetizing device. According to the number of magnetic poles of the rotor, a plurality of magnetic pole cores, each of which is divided into two parts of the above-mentioned magnetizer and wound with a coil, are arranged so as to face the outer circumference of an unmagnetized permanent magnet, and a pulse shape from a current supply device is provided. Comparison of the magnetizing device according to the first embodiment, in which the current flows through the coils of the plurality of magnetizers while being sequentially switched, and the conventional magnetizing device for simultaneously magnetizing all poles shown in FIGS. 6 and 7. The result is as follows. Here, assuming that the magnetomotive force required to magnetically saturate the permanent magnet is H _m , the thickness of the permanent magnet is t _m , and the number of turns of one coil is N, the current required for magnetization of one pole is obtained. I _m becomes I _m = H _m · t _m / N, and at this time, the inductance L ₁ of the coil when the coils are magnetized by connecting the coils in series with the above all poles is L ₁ = μ _m · N ² · S / t _m × 4 Here, μ _m represents the magnetic permeability of the permanent magnet, and S represents the area of one pole of the magnet. Inductance L _{2 in} the case of a coil wound around a pair of magnetic pole cores in the magnetizing device shown in the first embodiment
_{Is, L 2 = μ m · N} 2 · S / t m , and the relative said the conventional system, the inductance of the coil is 1/4.

On the other hand, of the current flowing through the coil during magnetization,
The current peak value of the first cycle, which is composed of the resonance circuit of the coil of the magnetic pole iron core and the capacitor of the current supply device, is approximately the voltage applied between the coils by V ₀
Then, since I _m = V ₀ √ (C / L), the capacity of the capacitor required for the power source is C ₁ = (I _m / V ₀ ) 2 × L _{1 in} the conventional case, and In the case of form 1, C ₂ = (I _m / V ₀ ) 2 × L ₂ . Therefore, the capacity of the power supply is only 1/4 that of the conventional magnetizing device that magnetizes all poles, so that the power supply capacity of the current supply device can be made smaller, and the size of the capacitor becomes smaller. can do.

The current and the magnetizer are divided into two parts to the left and right by the through holes.
The magnetic pole cores, which are divided and wound with coils, are arranged in a set so as to face the outer circumference of an unmagnetized permanent magnet, and the magnetic pole is located at the magnetic pole position formed by the magnetization of the permanent magnet on the circumference of the rotor. A magnetizing device is provided with a positioning means for rotating the iron core or the rotor so as to match the position of the magnetic pole of the magnetizer with the position of the magnetic pole of the rotor and to magnetize the magnet in multiple times. As a result, the inductance of the coil wound around the magnetic pole iron core of the magnetizer is greater than that of a conventional magnetizer that is composed of a magnetizer that requires magnetic pole cores for the number of magnetic poles for simultaneously magnetizing all poles. Since only one magnetic pole is required, the magnetizing device can have a small magnetizer. Also,
The configuration in which the magnetic pole cores, in which the coils are wound so as to be magnetized in different directions from the above-mentioned one set of magnetic pole cores, are arranged so as to face each other on the circumference is twice as large as that in the above case. .

Further, the first magnetizer in which the magnetic pole cores of the magnetizer are arranged at intervals of one pole on the circumference of the rotor, and the magnetic pole core position of the first magnetizer in the circumferential direction. A second magnetizer arranged on the circumference of the rotor at a position offset by one pole interval is concentrically arranged at an axial interval, and an unmagnetized permanent magnet is mounted. First rotor described above
And a magnetizing device having means for moving and positioning to the second magnetizer. Thus, by magnetizing the permanent magnets at the positions corresponding to the respective magnetic pole cores by the first and second magnetizers, the power supply capacity of the current supply device of the conventional magnetizer that magnetizes all poles simultaneously Can be made smaller.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a magnetizing device for a rotating field permanent magnet synchronous motor according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a magnetizing device for a rotating field type permanent magnet synchronous motor according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a magnetizing device for a rotating field type permanent magnet synchronous motor according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a magnetizing device of a rotating field type permanent magnet synchronous motor according to a fourth embodiment of the present invention.

5 is a view as seen from arrows V ₁ and V ₂ in FIG.

FIG. 6 is a perspective view of a magnetizer that constitutes a magnetizing device of a conventional rotary field permanent magnet synchronous motor, and a rotor that mounts an unmagnetized permanent magnet before being inserted into the magnetizer.

FIG. 7 is a configuration diagram of a magnetizing device that magnetizes a permanent magnet of a rotor inserted and attached to a conventional magnetizer.

FIG. 8 is an explanatory diagram of a principle of magnetizing a permanent magnet, (a)
Is the current flowing through the coil of the magnetic pole core, and (b) is the hysteresis curve of the permanent magnet.

FIG. 9 shows a magnetic flux distribution and a magnetization state when a permanent magnet is partially magnetized into two poles in a conventional magnetizing device.

[Explanation of symbols]

 1 rotor 2 permanent magnet 3 groove part 4 coil 5 magnetic pole core 5a magnetic pole core 5b magnetic pole core 5c magnetic pole core 5e magnetic pole core 5f magnetic pole core 5g magnetic pole core 5h magnetic pole core 6 magnetizer 6a magnetizer 6b magnetizer 6c magnetizer 6c Magnetizer 7 Current supply device 8 Magnetizer 8a Magnetizer 8b Magnetizer 8c Magnetizer 8d Magnetizer 20 Through hole 30 Coil 40 Magnetic flux generating circuit 60 Changeover switch 62 Positioning means 70 Supporting member 71 Fixing member

Claims (11)

[Claims] 1. A magnetic pole core that is arranged concentrically with the rotor facing the outer circumference of an unmagnetized permanent magnet mounted on the outer circumference of the rotor and is divided in the circumferential direction by a groove portion provided in the axial direction. And a magnetizer consisting of a coil inserted into the groove of the magnetic pole core, and a current supply device for supplying a pulsed current from a capacitor charged by a power source to the coil. A rotating magnetic field type permanent magnet synchronization that supplies a pulsed current to the coil and magnetizes the unmagnetized permanent magnet at a position facing the magnetic pole core by the magnetic flux flowing through the magnetic pole core to form a magnetic pole on the rotor. In a magnetizing device of an electric motor, a magnetizer is provided with a through hole that divides a magnetic pole core between groove portions into two in a circumferential direction in an axial direction at a position of a magnetic pole center of the magnetic pole core and is adjacent to each other via a groove portion of the magnetic pole core. Heterogeneity A plurality of magnetic pole cores formed by winding the coils through the through hole and the groove portion with the winding directions reversed to each other are arranged in each of the two divided magnetic pole cores each having a 1/2 pole width. The magnetic pole iron cores of each group are provided with means for sequentially switching and connecting the pulsed current from the current supply device to the coils provided in the magnetic pole cores of each group arranged in the circumferential direction of the magnetizer. A magnetizing device for a rotating field type permanent magnet synchronous motor, characterized in that a portion of a permanent magnet facing a coil is magnetized in a circumferential direction while magnetizing different poles by 1/2 pole each. 2. The magnetizing device for a rotary field type permanent magnet synchronous motor according to claim 1, wherein a plurality of sets of magnetic pole iron core coils arranged in the circumferential direction are connected in series. A magnetizing device for a rotating field type permanent magnet synchronous motor. 3. A magnetizing device for a rotary field type permanent magnet synchronous motor according to claim 1, wherein a plurality of magnetic pole iron core coils arranged in the circumferential direction are connected in parallel. A magnetizing device for a rotating field type permanent magnet synchronous motor. 4. A magnetic pole core that is arranged concentrically with the rotor facing the outer circumference of an unmagnetized permanent magnet mounted on the outer circumference of the rotor and is divided in the circumferential direction by a groove portion provided in the axial direction. And a magnetizer consisting of a coil inserted into the groove of the magnetic pole core, and a current supply device for supplying a pulsed current from a capacitor charged by a power source to the coil. Magnetization of a rotating magnetic field type permanent magnet synchronous motor for supplying a pulsed current to the coil and magnetizing a permanent magnet at a position facing the magnetic pole core by a magnetic flux flowing through the magnetic pole core to form a magnetic pole on a rotor. In the device, a magnetizer is a magnetic pole iron core having winding poles each having a magnetic pole width of ½ pole and adjacent to each other through a groove portion of the magnetic pole core. One group And a means for locating the position of the magnetic pole core and the magnetized position of the unmagnetized permanent magnet of the rotor are provided, and the coil provided on the magnetic core arranged in the magnetizer is connected to the coil from the current supply device. Pulsed current is passed through, the portions of the permanent magnet facing the coil of the magnetic pole iron are magnetized by ½ poles in different poles from each other, and the magnetizing position is sequentially moved by the positioning means. A magnetizing device for a rotating field type permanent magnet synchronous motor, which is magnetized in a direction. 5. The magnetizing device for a rotating field type permanent magnet synchronous motor according to claim 4, wherein the positioning means sets the magnetizing position of the permanent magnet at the position of the magnetic pole core provided on the magnetizer. A magnetizing device for a rotating field type permanent magnet synchronous motor, characterized in that it is rotationally moved and aligned. 6. The magnetizing device for a rotary field type permanent magnet synchronous motor according to claim 4, wherein the positioning means rotationally moves the magnetizer to the magnetized position of the permanent magnet of the rotor to position the magnetic pole core. A magnetizing device for a rotating field type permanent magnet synchronous motor, characterized in that they are combined. 7. A magnetizing device for a rotating field type permanent magnet synchronous motor according to claim 4, wherein a coil is provided on a magnetic pole iron core arranged in the magnetizer from a current supplying device. 2. A magnetizing device for a rotating field type permanent magnet synchronous motor, comprising: switching means for switching the flow direction of the pulsed current. 8. A magnetic pole core which is arranged concentrically with the rotor facing the outer circumference of an unmagnetized permanent magnet mounted on the outer circumference of the rotor and which is divided in the circumferential direction by a groove portion provided in the axial direction. And a magnetizer consisting of a coil inserted into the groove of the magnetic pole core, and a current supply device for supplying a pulsed current from a capacitor charged by a power source to the coil. Magnetization of a rotating magnetic field type permanent magnet synchronous motor for supplying a pulsed current to the coil and magnetizing a permanent magnet at a position facing the magnetic pole core by a magnetic flux flowing through the magnetic pole core to form a magnetic pole on a rotor. In the device, the magnetizer includes a magnetic pole core having two magnetic poles each having a width of ½ pole, which are adjacent to each other via a groove portion of the magnetic pole core, and the coils are wound in opposite winding directions. With the magnetic pole of The coil of the first magnetic pole core is set such that the winding direction of the coil is opposite to the magnetization direction of the permanent magnet that is connected to the coil of the first magnetic pole core and is magnetized by the pulse current supplied from the current supply device. A second magnetic pole core wound in the opposite direction to that of the first magnetic pole core, and the positions of the first and second magnetic pole cores and attachment of unmagnetized permanent magnets of the rotor. Positioning means for positioning the magnetic position is provided, and a pulsed current from the current supply device is passed through the coils provided on the first and second magnetic pole iron cores arranged on the magnetizer, and Rotation field type, characterized in that the portions of the permanent magnet facing the coil are magnetized by ½ poles to different poles, and are magnetized in the circumferential direction while moving the magnetizing position by the positioning means. Magnetizing device for permanent magnet synchronous motor. 9. A magnetizing device for a rotary field type permanent magnet synchronous motor according to claim 8, wherein the positioning means are provided at respective positions of the first and second magnetic pole cores provided on the magnetizer.
A magnetizing device for a rotating field type permanent magnet synchronous motor, wherein the magnetizing position of a permanent magnet of a rotor is aligned by rotating the rotor. 10. A magnetizing device for a rotating field type permanent magnet synchronous motor according to claim 8, wherein the positioning means rotationally moves the magnetizer to the magnetizing position of the permanent magnet of the rotor. A magnetizing device for a rotating field permanent magnet synchronous motor, characterized in that the magnetic pole cores of 2 are aligned. 11. A magnetic pole core which is arranged concentrically with the rotor facing the outer circumference of an unmagnetized permanent magnet mounted on the outer circumference of the rotor and which is divided in the circumferential direction by a groove portion provided in the axial direction. And a magnetizer consisting of a coil inserted into the groove of the magnetic pole core, and a current supply device for supplying a pulsed current from a capacitor charged by a power source to the coil. Magnetization of a rotating magnetic field type permanent magnet synchronous motor for supplying a pulsed current to the coil and magnetizing a permanent magnet at a position facing the magnetic pole core by a magnetic flux flowing through the magnetic pole core to form a magnetic pole on a rotor. In the device, a magnetizer is a magnetic pole core in which coils are wound in opposite winding directions on a magnetic pole core having two magnetic poles each having a width of ½ pole and which are adjacent to each other through a groove portion of the magnetic pole core. The pole A plurality of first magnetizers arranged at intervals with intervals, and permanent magnetized by a pulsed current supplied from a current supply device, which is connected to a coil of a magnetic pole core of the first magnetizer. A second magnetic pole core, which is formed by winding the coil in the opposite direction to the coil of the first magnetic pole core so as to be opposite to the magnetizing direction of the magnet, is used as a magnetic pole core position of the first magnetizer. And a plurality of second magnetizers arranged in a plurality of positions at intervals displaced by one pole interval in the circumferential direction, are concentrically arranged at intervals in the axial direction, and are configured as permanent magnets of the rotor. Means for moving and positioning the above-mentioned first and second magnetizers to the magnetizing positions of the first and second magnetizers, and each coil provided on the magnetic pole cores of the first and second magnetizers is provided with a current supply device. Pulsed electric current is switched and connected to flow, and magnetic pole irons of the first and second magnetizers are provided. Rotation field type permanent magnet synchronous motor magnetizing apparatus characterized by magnetizing magnetized by ½ pole of the different poles each other site of the position of the permanent magnet corresponding to.