JPS58116045A - Measuring method for electric machine core - Google Patents

Abstract

PURPOSE:To improve the workability by disposing an exciting pole, on which exciting and measuring coils are wound in advance, oppositely to the bore of an armature core through air gaps and measuring the magnetic characteristics of the core. CONSTITUTION:Exciting poles 4, on which exciting and measuring coils 1 and 2 are wound in advance, are disposed oppositely to the bore of a circular armature core through air gaps 5, 5' in the bore of the core. The magnetic characteristics of the armature core is measured by measuring a current I1 supplied to the coil 1 and a voltage induced at the coil 2. In this manner, the workability is improved, and the magnetic characteristics can be accurately measured.

Description

[Detailed Description of the Invention] Technical Separation of the Invention The present invention is a method for measuring and controlling the magnetic properties of an armature core, which is formed by punching and laminating iron plates and integrating them, in the mass production process while improving workability. Tsuki Tetsushin characteristic measurement method C: related.

Technical Background of the Invention Generally, the armature core of a rotating machine has [
*It is an annular shape made by laminating and integrating grooved iron glue, in which a plurality of grooves for storing +II wires are arranged, to a required thickness. As for the magnetic properties of this armature core, it is required to measure the core's excitation IIM resistance and iron loss flux. In response to such a request, the characteristics have been conventionally measured by placing the iron core material in a collection C: and measuring its magnetic characteristics by tm using the Epstein method or the like.

However, since temporal deterioration is unavoidable in the subsequent processing steps of punching and lamination-2, it is desirable to measure and manage the characteristics after core lamination as an intermediate step.

Therefore, the following methods have been conventionally adopted as measurement management methods to achieve this purpose. In other words, 1s
As shown in Figure 1, the excitation coil 1 and measurement coil 2 are wound around the yoke part of the annular armature core, and a predetermined alternating current is supplied to the excitation coil 1 to generate magnetic flux. 3
At this time, the input (excitation) to the excitation coil 1 (excitation) 'ai[, the voltage induced in the measurement coil 2], and the voltage induced in the measurement coil 2, A method is adopted in which the desired magnetic 4I- property is determined by changing the needle side.

However, such conventional methods have the following drawbacks.

First, $1 is a skewer in which the magnetic flux 3 passes only through the yoke part and does not pass through the groove part of the iron core as shown in the figure. As shown in Figure 1, the measurement in Figure 1 was performed under conditions different from the actual magnetic flux, as the route is taken from the rotor to the yoke via the groove, and then back to the rotor through the groove on the opposite magnetic pole side. In general, deterioration during the punching process of the iron core also appears in the groove part, so measuring only the thicker yoke part described above is sufficient (the good characteristics of the second glaze degree). Unable to perform measurements.

The second problem is that the workability in measuring characteristics is poor. In other words, the characteristics of the iron core? Since it is necessary to wind each of the excitation and measurement coils 1 and 2 around the annular iron core each time the ll+ determination is performed, the number of turns of the coils is limited by a certain tIM degree. Therefore, in order to obtain a given number of excitation amperes (
Second, the excitation and magnetic current must be increased in proportion to the size of the core cross section, making handling of each coil 1 and 2 difficult.

Purpose of the Invention The present invention was made in view of the above-mentioned situation, and its purpose is to provide an electric iron core that can improve workability, expand the number of control axes, and measure magnetic properties with high precision. The purpose of this invention is to provide a method for measuring the characteristics of

SUMMARY OF THE INVENTION In order to achieve the above object, in the present invention, iron plates having a plurality of 41 grooves for storing armature windings are laminated to a required thickness and integrated. When measuring the magnetic properties of the armature core, an excitation pole around which an excitation coil and a measurement coil are wound is placed in advance on the inner diameter of the SWA child core so as to face the inner diameter of the SWA child core with a gap therebetween. The voltage induced in the excitation coil supplied by the excitation coil, the voltage induced in the measurement coil, and the magnitude based on these are used to measure the voltage.

Example of Meimen of the Invention The present invention will be described below with reference to an embodiment shown in Fig. The parts are shown with the same reference numerals, that is, the excitation pole 4 in which excitation and measurement coils 1°1 are pre-wound around the inner diameter of the annular armature core in Fig. are arranged so as to face the inner diameter with gaps 5 and 5' interposed therebetween.

Here, the length t1 of the excitation pole 4 in the axial direction (direction of the magnetic layer) should not be shorter than the m bank of the armature core, and
The noodles are determined by assuming the longest stacking thickness that can be expected for a vi-type or electronic image core with the same gap diameter. Also, encouragement @
pole 41. The length in the #1 direction of the polar roar differs by about 90e at the circular part's 174, that is, the central angle. - Support 111 for removal
In order to make the IF1 range that does not occur in 1i' as narrow as possible (
= Select grass. Furthermore, the excitation coil 1 forms the amperage to obtain the required @ end, but in order to suppress the change in pE during the #! Select the wire size and number of turns. Also, since the % measuring coil 2 is intended to detect the amount of magnetic flux passing through the iron core and extract its induced electric force ratio, the amount of copper may be small.

Next, the characteristic measurement method will be described in detail.

In the circuit 6 shown in FIG. 3, a predetermined frequency #! is applied to the excitation coil 1. When an AC voltage of i (generally a commercial wave number) is applied, a magnetic flux I is generated, and as described above, the excitation pole 4 - the air gap 5 - the groove 6 - the yoke 1 - the #1 section 6' - the air barrier 5' - the excitation pole 4 magnetic paths are alternated. Let the amount of magnetic flux at this time be φ, the magnetic flux density at any cross section of the magnetic path be B, and the magnetic path break [k+product of that cross section be A].

If the voltage induced in the measuring coil 1 is E, then 1l-444fNt" φ Xl0-"- is -94.

13mF K: constant (-4, 44fN, ・101) From the above relationship, the induced electric current ratio B of the 1ltl constant coil 2.

By keeping φ at a predetermined value, the amount of magnetic flux φ can be held constant regardless of variations in the magnetic path, and thus the magnetic flux density of each part can also be measured under constant conditions. What is generally required as management axis property is the excitation time property of the iron core and the iron loss ratio. Each variation can be calculated from m1j9.

First, since the magnetized electric shield for inducing the required magnetic flux density φt- of mll value 11 is the main component, approximately that value can be considered to be the excitation & f resistance of the armature core, but the air gap 5,
When considering the variation of 51, as shown in FIG.
It is better to consider the relationship between , and the starting current (4), vc, and separate the ampere conductor s consumed in the empty part to make a judgment.

Ic in FIG. 4 corresponds to the magnetizing force spent in the iron core.

Next, the iron loss value is the value obtained by subtracting the copper loss of the excitation coil 1 and the iron loss in the excitation pole 4 from the total human power, so Wil# Wo - (II '' rl + w +, )
However, Wo: the power formed by all input cars E, and I x 1 n! ■: Input current nl to excitation coil 1, fig: S number of coil 1.2 rt: Resistance between terminals of excitation coil 1 WA*: Iron loss of excitation pole 4, where φ and f Under certain conditions, W
Since il is a constant value, it becomes a constant value, and if there is no change in 1 during measurement (@ it is good to keep the temperature pL of magnetic coil 1 constant) By adjusting the acid constants of 1i, Wo and I, it is possible to control the fluctuation state of Wil.

In this way, the armature core is made by storing the Amenko winding in the inner diameter part of one disc-shaped mantissa, and then laminating and integrating the PJ steel plates in several grooves 6 and 6' to the required thickness. When measuring the magnetic properties of a magnetic field, the excitation pole 4, which has previously passed through the excitation coil 1 and the measurement coil 2, is placed opposite the inner diameter of the above-mentioned armature core through 9 holes 5.5'. Place it as you like.

The measurement is made from the excitation electric shield l supplied to the excitation coil 1, the pressure E1 induced in the measurement coil 2, and the electric power WO based on these.

Therefore, the following effects can be obtained.

(1) It is possible to measure the magnetic undulation with extremely high accuracy because the characteristics of the 9-taste facing surface and the thin part, which were considered to be out of control using conventional measurement methods, can be determined through m*t-. can.

(2) The excitation coil is layered #! Since there is no need to apply a constant Ikuhiro, the necessary and sufficient number of turns tS can be applied to the circuit 1.
It is possible to suppress the cost to an appropriate value.

(3) Since the excitation and measurement coils necessary for measurement are wound in advance so as to interlink with the magnetic circuit, it is only necessary to simply push the armature core to be measured into the excitation pole.
There is no need to wind or unwind the coil around the iron core, significantly improving work efficiency.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be realized in the following manner.

+11 In the above measurements, the smaller the number of grooves in the general C two-armature core, the smaller the number of grooves, so differences in magnetic resistance tend to occur depending on the relative position in the circumferential direction with the excitation pole. To avoid! As shown in Figure s5, at least one overdraft 1 of the magnetic pole is provided as a positioning guide, and this can be aligned with the droplet part of the armature core for fixing the hook to stabilize the position. (2) The variation in the gap length between the excitation pole outer diameter and the core inner diameter can be dealt with by the method described above, but as a method to further improve the workability of measurement, the method shown in Figure 6, c-2, can be used. Then, the excitation pole 4 is divided into two parts at an inclined line position that has an angle of 45@ or less with respect to the pole center axis E, so that it can be slid together along the dividing line, and by adjusting that part, the magnetic pole boat can be automatically assembled. It is possible to adopt a structure in which measurements are made with the void length always at its minimum.

(3) The general case where the 11 armature is in external ringing was described above, but the same principle can also be applied to the case of the internal armature type in a relatively completely opposite manner.

Other 1. The present invention can be implemented in various modifications without changing its gist.

Masuaki Yojimoto, who explained above, is a method for measuring the physical properties of electrical iron cores, which can be used to widen the tube-embedded Ig curve and measure properties at once with extremely good axiality, while also improving workability. method can be provided.

[Brief explanation of the drawing]

Figure 1 shows the conventional measurement principle, and Figure 2 shows the &
A conceptual diagram specifically showing the situation of the B bundle, Figs. 3 and 4 are schematic diagrams showing one embodiment of the present invention, and Figs. 5 and 6 are schematic diagrams showing other embodiments of the present invention. It is. 1... Excitation coil, 1... Measurement coil, 1...
・@end, 4... Excitation pole %5, 5'... Gap part, 6.
lx'... Groove, 1... Yoke, 1... Positioning guide. Outgoing Agent Patent Attorney Dosu Takeshi Jiang Disciple 1 Country 21st! ! Figure 3 Figure 4 I. Figure 5/--ゝN1 Figure 6

Claims (3)

[Claims] (1) Measuring the magnetic properties of an armature core made by laminating and integrating iron plates with a plurality of grooves arranged on the inner diameter side of a disc-shaped iron plate to accommodate the armature windings to a required thickness (2) On the occasion,
An excitation pole, around which an excitation coil and a measurement coil are wound in advance, is placed on the inner diameter of the case core so as to face the inner diameter of the case core with an air gap therebetween, and the excitation current supplied to the excitation coil and the measurement coil are A method for measuring the characteristics of a 4EJ11 iron core, characterized in that the measurement is performed from the electric ratio induced in the coil and the electric power based on these. (2) Scope of Claim No. (1) in which the relative device relationship between the armature core and the excitation pole is automatically regulated by making the protrusion 1-*-mouth part act as a positioning guide. Method for measuring characteristics of electrical iron cores described in Section 1. (3) The excitation pole is divided into two parts along the pole center axis (an inclined line position at a predetermined angle with respect to the pair) and can be slid together along the dividing line 42 to correct variations in the magnetic gap between the pole and the armature core. (The method for measuring the characteristics of an electric iron core according to claim (1).