JPS63257444A - Magnetizing device - Google Patents

Abstract

PURPOSE:To conduct optimum skew magnetization to various kinds of machines, by shifting a magnetizing yoke axially and by magnetizing an object to be magnetized while rotating it. CONSTITUTION:A magnetizing device is tarted to discharge the electric charge charged into a capacitor 6 inside a magnetizing power source 5 to a coil 10 for magnetization. At this time, an object 7 to be magnetized is magnetized by the portion of radial length a of a magnetizing yoke 1 from the edge of a permanent magnet 9. Then, the magnetizing yoke 1 shifts axially, when a magnetizing power source 5 is set to a charge mode. The object 7 to be magnetized rotates at the rotating speed to meet the skew angle on its holding section 2. During this rotation a capacitor 6 completes charging and again discharges to perform magnetization. After that, in keeping on axially shifting the magnetizing yoke 1 and shifting the object 7 to be magnetized in rotation, the capacitor 6 in the magnetizing power source 5 is repeated to charge and discharge for magnetization at specified time intervals. Consequently, the object 7 to be magnetized of the same diameter can be magnetized with a single magnetizing yoke 1, so that it is possible to magnetize for multiple kinds of machines.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a permanent magnet rotating electrical machine, and particularly to a magnetizing device suitable for mass producing high-performance rotating electrical machines with little slot ripple.

[Conventional technology]

Conventionally, when magnetizing a permanent magnet incorporated in the stator or rotor of a permanent magnet rotating electric machine, the shape of the object to be magnetized is 2.
A magnetizing yoke was manufactured according to the dimensions, and the magnetizing yoke was magnetized by passing current through a coil for generating magnetic flux once or twice.

Figure 3.4 shows an example of a conventional magnetizing device.

Hydraulic or pneumatic drive devices are often used to incorporate and remove magnetized objects into these magnetizing yokes.

[Problem that the invention seeks to solve]

The above conventional technology does not consider magnetizing objects of high quality, especially when implementing skew magnetization to reduce slot ripple, which is a factor of rotational speed pulsation in permanent magnet rotating electric machines. , one set of magnetizing yoke is required for each model. Moreover, since the magnetizing yoke also becomes larger in size to match the size of the object to be magnetized, there is a problem in that it is difficult to change the setup.

An object of the present invention is to provide a magnetizing device that can perform skew magnetization optimal for each model with relatively simple steps when magnetizing objects of various quality with the same magnetizing device.

[Means for solving problems]

The above purpose is to configure the axial length of the magnetizing yoke to be thinner than the axial length of the rotor or rotor to be magnetized, and to This is achieved by a magnetizing device that performs skew magnetization by magnetizing the object while moving it and simultaneously rotating it relative to the magnetization yoke.

[Effect]

As described above, since the magnetizing yoke is moved in the axial direction relative to the object to be magnetized, the axial length of one magnetizing yoke may be small. Therefore, the portions that need to be attached and detached when changing the setup are small. In addition, because the 1 magnetizing yoke is small, 1
The capacity of the power supply device that supplies current to the coil to generate magnetic flux to the magnetizing yoke is small.Furthermore, the skew angle is determined by the speed of rotation of the magnetized object relative to the magnetizing yoke, or the rotational distance. Since it can be changed by varying L, objects to be magnetized with the same diameter can be magnetized with one magnetizing yoke, from those with a long L to those with a short L.

〔Example〕

An embodiment of the present invention will be described below using FIG. 1.2.5.

The magnetizing device of the present invention includes a magnetizing yoke 1. Magnetized object holding part 2,
It is composed of a magnetized object rotating device 3, a magnetizing yoke axial movement device 4, and a magnetizing power supply device 5.

Figure 1 shows the four-pole permanent magnets built into the rotor.

An example of a magnetizing device is shown. FIG. 5 shows the magnetized object after magnetization. Next, the operation of the magnetizing device will be explained according to the order of magnetizing work.

First, the magnetized object 7 is attached to the magnetized object holding section 2.

Next, power is applied to the magnetizing power supply 5, and after charging the capacitor 6 in the first magnetizing power supply is completed, the first magnetizing yoke]- is set to the initial position. When this magnetizing device is started, the electric charge stored in the capacitor 6 in the magnetizing power supply is discharged to the magnetizing coil. At this time, the permanent magnet 9 is magnetized by the axial length a of the magnetizing yoke 1 from the end thereof. Next, the magnetizing power source 5 is set to charging mode, and at the same time the magnetizing yoke 1 begins to move in the axial direction.

The moving speed is set to the speed ()/1) at which the magnetizing yoke 1 moves a length l somewhat shorter than the axial length a of one magnetizing yoke 1 within the time required to completely charge the capacitor 6 in the power supply device. Further, the magnetized object holding section 2 rotates at a rotational speed that matches the skew angle θ. If the skew angle of the entire length of the permanent magnet 9 is 00, then the rotation speed is such that θx' rotates in seconds.After a second, the capacitor 6 in the power supply device is discharged again to perform magnetization. While continuing the axial movement of the magnetizing yoke 1 and the rotational movement of the magnetized object 7, the capacitor 6 in the magnetizing power source 1 is repeatedly charged and discharged for t seconds to continue magnetization. When the cumulative moving distance reaches L-no and the capacitor 6 in the magnetizing power source is discharged to perform magnetization, the magnetization of the entire permanent magnet is completed. After magnetization is completed, the magnetizing yoke 1 is moved to a position where the magnetized object 7 can be taken out, and after the movement is completed, the magnetized object 7 is taken out. The magnetizing yoke axial movement device 4 of this embodiment is composed of a general-purpose induction motor and a ball screw. The magnetized object rotating device 3 is composed of a ten-gear combination of an induction motor with a speed detector and an inverter. or,
Start/stop of each drive device and capacitor 6 in magnetizing power supply
Control of charging and discharging can be realized using a simple sequence circuit.6 Figure 5 shows.

According to this embodiment, the skew magnetization device of the present invention can be realized without requiring large-scale equipment. Furthermore, by setting the initial position and the rotational speed of the magnetized object holder M3, manual labor is only required when attaching and detaching the magnetized object and when starting and stopping the device.

In this embodiment, an induction motor is used as the drive source, but other rotating machines may be used.Furthermore, the magnetizing yoke axial movement device 4 is driven by a hydraulic system instead of using a rotating machine or a ball screw. etc. may also be used. In addition, in this embodiment, a method is used in which magnetization is performed while moving both the magnetized object 7 and the magnetization yoke 1, but a servo motor is used as the drive device, and the capacitor in the magnetization power supply is moved while stopping. There is also a method of magnetizing by discharging 6.

Furthermore, although this embodiment uses a capacitor charging/discharging type magnetizing power source, a power source that flows a constant direct current may also be used. In this case, the pole boundaries after magnetization are not step-like as shown in FIG. 5, but are straight.

〔Effect of the invention〕

According to the present invention, a skew magnetization device having the following features can be realized.

1) The magnetizing yoke is relatively small and setup changes are easy.

2) Objects with the same diameter can be magnetized with a single magnetizing yoke, so even when magnetizing multiple models, one less magnetizing yoke is required.

3) Even if the capacity of the magnetizing power supply is small, large objects can be magnetized.

4) Can be magnetized without much manual effort.

5) Special skew magnetization can be easily achieved as shown in Figure 6.

[Brief explanation of drawings]

Fig. 1 is a goose bump diagram showing the entire embodiment of the present invention, Fig. 2 is a developed view of the magnetizing yoke in Fig. 1, Fig. 3 is an elevational view of the conventional example, and Fig. 4 is a bird's-eye view of the conventional example. 5 and 6 are goose bump diagrams showing a magnetized object after being magnetized by the magnetizing device of the present invention. 1. Magnetizing yoke; 2. magnetized object holding section; 3. Magnetized object rotating device, 4. Young magnetic yoke axial movement device. 5. Magnetizing power supply, 68 capacitor in magnetizing power supply, 7° magnetized object, 8. Ball screw, 9. Permanent magnet, 10° magnetizing coil, 1], gear, 12. Induction motor with speed detector, 13
．． General purpose induction motor. 3: Bin M first eye, &-if A' field magnet electric sieve go, de) Boo 9: Permanent magnet tenth 2nd eye 3 eye 4 flower 5 figure 6 concave

Claims (1)

[Claims] 1. In a device that magnetizes a permanent magnet that is built into the stator of a rotating electric machine that has a permanent magnet or a rotor, the magnetization yoke that surrounds the magnetized object is a stator that attempts to magnetize the axial length. Alternatively, a magnetizing device configured to be thinner than the axial length of the rotor and magnetized while moving a magnetizing yoke in the axial direction relative to a magnetized object.