JPS63202007A - Magnetizing apparatus - Google Patents

Abstract

PURPOSE:To prevent breakdown of magnetic plates, by applying a cushioning film around the inner surface of the main body of a magnetizing apparatus. CONSTITUTION:A cushioning film 6 is applied around the entire inner surface of a main body 1 of a magnetizing apparatus. At this time, the cushioning film 6 is openly expanded from the upper and/or lower ends of the main body 1 and extended outward. Thus a guide parts 6' are formed. A rotor 8, in which a shaft 7 is inserted and fixed, is inserted into the cylinder of the main body. At this time, even if the rotor is slightly deviated, the rotor can be suitably centered and slidden in owing to the inclination of the guide parts 6' of the cushioning film. Even if magnets 9 are contacted with the inner surface of the main body 1, breakdown of the magnets 9 can be prevented with the cushioning action of the film.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetizer for magnets of rotors for synchronous motors, and in particular magnets such as ferrite magnets, alnico magnets, samarium cobalt magnets, etc. 1-
It is arranged on the circumferential surface and used for magnetizing the next rotor.

[Conventional technology]

2. Description of the Related Art A rotor for a synchronous motor having an easily chipped magnet bonded to its outer peripheral surface is well known, and magnetizers for the rotor shown in FIGS. 2A, 2B and 20 are conventionally known.

Figure 2A is a plan view of the rotor inserted into the magnetizer, and Figures 2B and 20 are schematic side views of the rotor inserted and removed, respectively, as is clear from the figures. , a plurality of notched recesses 2 extending from the upper end to the lower end are arranged at equal intervals on the inner circumferential surface of the nine main body l formed of a laminate of electromagnetic steel plates, and a winding 3 is inserted into the recesses 2. A magnet plate 9 made of a magnetic material (for example, a ferrite magnet) that is easily chipped is attached to the outer peripheral surface of the rotor 8 that constitutes the magnetizer and is fixed through the shaft 7.
A plurality of sheets are attached to each other at equal intervals, and the gap G between the surface of each magnet plate and the inner peripheral surface of the main body is approximately constant so that the magnetizing force does not vary depending on the location. Each magnet 9 is magnetized.

[Problem that the invention seeks to solve]

When using a conventional magnetizer to magnetize the rotor by attaching magnets that are easily damaged to the outer circumferential surface, it is necessary to form a rough surface between the outer surface of the magnet and the laminated state of the electromagnetic steel sheet in order to improve magnetization efficiency. The gap between the inner circumferential surface of the main body 1 and the inner peripheral surface of the magnetizer is usually 11111 mm or less, and the operation of aligning and inserting the main body 1 of the magnetizer and the already assembled rotor requires skill and is difficult. Because of these two points, as shown in Figure 2B, if the rotor is inserted without being completely aligned, the lower end of the magnet 9 and the inner upper end of the main body 1 will collide at point P1, causing the magnet to be damaged. However, as shown in Figure 2C, during insertion or removal, the magnet may be broken by applying it to the inner surface of the main body. In addition, the rotor after magnetization tends to stick to the inner surface of the main body, and the impact also causes the magnet to break.

Not only will the specified performance not be obtained due to damage to the magnet, but if the magnet breaks after magnetization,
The crushed pieces of the magnet are attached by magnetic force, but when such a defective rotor is incorporated into an electric motor, it causes problems such as not rotating or getting caught during rotation.

The object of the present invention is to provide a magnetizer that is completely free from these dangers.

[Means and effects for solving the problem] As shown in FIG. 1B, the present invention is to stretch a cushion film 6 over the entire inner circumference of the magnetizer main body 1. When inserting the rotor into the cylinder of the main body, the bush and/or membrane 6 are extended from the upper end and/or the lower end of the main body 1 to form a guide part 6', and the shaft 7 is fixed therethrough. Even if the rotor is slightly misaligned, it will slide in while being properly centered due to the inclination of the guide portion 6' of the cushion membrane, and even if the magnet hits the inner surface of the main body, the magnet will be damaged due to the action of the shoe 7.7 of the membrane. I no longer do it.

In addition, by setting the thickness of the cushion film to an appropriate value, it was possible to easily maintain the distance G between the magnet plate surface and the inner peripheral surface of the main body substantially constant over the entire surface.

〔Example〕

Fig. 1A is a cross-sectional view of the rotor inserted into the magnetizer of the present invention, and Fig. 1B is a longitudinal cross-sectional view of only the N porcelain, with the rotor inserted into the magnetizer. .

As is clear from these figures, the main body 1 of the magnetizer is made of laminated electromagnetic steel sheets, and a plurality of cut recesses 2 are arranged at equal intervals on the inner peripheral surface of the main body 1 from the upper end to the lower end. The winding 3 is inserted into the cut recess, and a thin aluminum alloy support cylinder 4 having the same outer diameter as the main body is erected on the outer periphery of the upper and lower end surfaces of the main body.
An annular plate 5 having a hole with a diameter larger than the inner diameter D1 of the main body 1 is placed on the support cylinder 4, and the annular plate 5 and the support cylinder 4 are fixed to the main body with bolts 10. Next, in consideration of replacing the upper and lower annular plates 5°5 with a cushion film 6 made of a Teflon sheet whose thickness is thinner than the gap G between the magnet plate surface and the inner peripheral surface of the main body, the plates 11 and 12 are fixed with bolts 12. .

In the cushion film 6, the inner diameter of the annular plate 5 is the main body inner diameter Dt.
Since the inner edge of the outer end of the annular plate 5 and the inner edge of the outer end of the main body 1 are inclined at an angle θ, forming a cushion film guide portion 6', the gap between the annular plate 5 and the main body 1 is slightly larger. In between, the cushion membrane guide portion 6' became a stretched portion of only the membrane without a backing material.

The rotor magnetized by the magnetizer of the present invention is a conventional rotor,
A plurality of magnet plates 9 are attached to the outer circumferential surface of a rotor 8 made of a magnetically permeable material at a constant interval.

In the obtained loading/unloading device, when inserting a conventional rotor having a shaft fixed therethrough, the edge of the magnet on the outer peripheral surface of the rotor comes into contact with the cushion film guide portion 6' on the outside of the main body l. Also, the film of the guide portion 6' is elastically deformed, so that no destructive force is applied to the magnet, and the angle θ of the guide 6' is
The centering action of the rotor was induced by the bending caused by the inclination of the rotor. The gap G between the inner surface of the main body and the outer circumferential surface of the magnet is conventionally the same, but the presence of the Teflon film allows the rotor to be smoothly slid and guided, and the gap G can be kept approximately constant. This allows for smooth removal and removal of the rotor, which has an attractive force after magnetization.

In addition, the same effect can be obtained by using Nomex paper (Dupont product name) as the cushion film. For example, the main body 1 is usually fastened and fixed with a bolt or the like and formed in layers, but it is possible to use a longer one for the bolt and reuse it. It is also possible to hold and fix the annular plate 5 by doing so.

〔Effect of the invention〕

A cushion film is attached to the inner circumference of the magnetizer body, and a fragile and easily chipped magnet plate is attached to the outer circumference of the magnetizer to prevent the rotor from breaking inside the magnetizer body even under minute gaps. The magnet plate can be inserted easily and quickly while keeping the gap between the surface of the magnet plate and the inner peripheral surface of the main body substantially constant.

The inclined guide portion 6' of the cushion membrane achieves centering of the rotor during insertion.

The rotor may come off after magnetization, and the rotor may stick to the main body.
The surface of the cushion membrane slides much more smoothly than the surface of the main body made of a laminated iron core, allowing the rotor to be removed and removed smoothly.

[Brief explanation of the drawing]

FIG. 1A is a cross-sectional view of the rotor inserted into the magnetizer according to the present invention, and FIG. 1B is a side view of only the magnetizer in the same state. FIG. 2A is a plan view of a state in which a rotor is inserted into a conventional magnetizer, and FIGS. 2B and 2C are explanatory views of the process of inserting a rotor into a conventional magnetizer. body, 2: cut recess, 3: winding, 4: support, 5: annular plate, 6: cup 7, membrane, 7: shaft, 8: rotor,
9: Magnet, θ: Cushion. angle of inclination of the membrane guide portion 6'. 1...Body 2...Notch recess 3...Winding 4...Support 5...Retaining ring 1st B turn 8...Rotor 9...Magnesoto

Claims (1)

[Claims] 1. The winding (3) is inserted into a plurality of notch recesses (2) arranged at equal intervals on the inner peripheral surface of the main body (1), and the winding wire (3) is inserted over the entire inner peripheral surface of the main body. The magnetizer is covered with a cushion film (6). 2. The magnetizer according to claim 1, wherein the cushion film (6) has a guiding inclined widening portion extending from the upper end and/or lower end of the main body (1). 3. The magnetizer according to claim 2, wherein the guiding inclined expansion portion (6') is only a cushion film.