JPS5849054A - Stator core for motor - Google Patents

Abstract

PURPOSE:To obtain a stator core which does not magnetically saturate in a toothed part and a yoke section even if the magnetic flux density of an air gap is increased by reducing the thickness of a laminated core by selecting the height in a yoke and the slot of the toothed part in a specified relationship. CONSTITUTION:The yoke of a stator core and slots of toothed part are formed to become a relationship of 1.80<=pi.D/(dts.S1)<=1.90, 1.80<=D(hys.P)<=1.90 where the inner diameter of the core is represented by D, the width of the tooth is by dts, the number of the slots is by S1, the height of the yoke is by hys and the number of poles is by P. In this manner, thickness of the stator core can be reduced, and the capacity of an operating condenser can be reduced in a washing motor and in a motor having excellent characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator core for a W motor, and more particularly, an object of the present invention is to provide a stator core for a motor suitable for a washing machine motor.

Generally, in a conventional single-phase induction motor, the maximum magnetic flux before the air gap ff (Bgm)h 0.65 to 0.80W t)/
#/, Maximum magnetic flux density (Btm8, Byms) Hl of 0 part (teeth part, yoke part), 50~1.80wb/
The maximum magnetic flux density of the stator core (Btms, Byms) and the maximum magnetic flux density of the air gap (B
gm) and o ratio, Btff18/Bgffl, B7m8/
A Bgfflrr of 2.0 or higher was normal.

In recent years, with advances in electrical materials, there has been a trend toward miniaturization by increasing the insulation class of the stator and reducing the thickness of the iron core, in other words, by increasing the magnetic flux density in the air gap. When using existing iron cores, there is a limit to how thin the stator core can be made because magnetic saturation occurs in the teeth and yoke parts of the iron core.

The present invention has been devised to solve the above-mentioned problems, and even if the core thickness is reduced and the magnetic flux density in the gap is increased, magnetic saturation does not occur in the teeth and yoke parts of the stator. It aims to provide an iron core.

The maximum magnetic flux density in the air gap Bgm minus the maximum magnetic flux density in one pole +!
It is given by the following formula for m.

Here, the apparent thickness of the Irj core, tep, is the pole pitch.

Next, the maximum magnetic flux density BtmB of the six-legged iron core tooth joint is given by the following equation considering the maximum value of the spatial distribution.

Here, the dts tooth width, the number of q inner pole grooves, and the nucleated thickness of the ln core.

j, the ratio of Bgm and Btm8, Btms/Bgm, is (1
), (according to formula 21, Ip = π・D/P, the inner diameter dimension of the D core, P is the number of strokes (1
=s1/P, 51rj70y) total number, ln=0.93
Since there is a relationship with 1, equation (3) can be expressed as follows.

Btms π·D Furthermore, if the ratio Byms/Bgm of the maximum magnetic flux density Byms of the solid foot core portion and the maximum magnetic flux density Bgm of the air gap portion is similarly calculated, it can be expressed as shown in the following equation.

Here, hysH is the yoke height.

The lamp of the present invention, JBtms/Bgm according to the above formulas (4) and (5)
, B31'm8/Bgm, respectively, are equivalent ratios ≦α≦
1.90.The shape of the yoke, teeth, and slot 1 of the stator core is determined so that 1.80≦β≦1.90.

Now, as an example, let α be within the range of the present invention (1,80≦a≦1
．． 90) (specifically aα=1°85)
, β are shown in Table 1 and FIG. 2. In addition, the thickness of the iron core was 175 m, which was thinner than that generally used as the electric motor for conventional layer washing machines, and the capacitor capacity was 10 μF't.

Table 1: Used in washing machines! The motive is rr, the input at 11M is small ([7F can be saved]), 1) rotation speed under load ≧1330 (r-I) - m) 2) starting torque ≧2.00
(ln=1) 3) Stall torque ≧3.80 (#-IcgI
) -t'Arukoto 2 is preferable in terms of product specifications.

Taking this into account, the electric motor for a washing machine should be 1.80.
It is clear that the range of ≦β≦1.90 is good.

Next, the motor performance characteristics of the embodiment of the present invention and the conventional example are compared and are shown in Table 2. The shapes and dimensions of the outer diameter and inner diameter of the embodiments of the present invention are the same. The dimensions of the iron plate in the example are: n=65CIi1M), dts-4,6(W), 51
=24. h78=8.8(關), p==4.

In addition, various dimensions tI'1dt8-4 of the iron core in the conventional example
．． 0 (at), h3'8=7.3 (all)? , other dimensions rj are the same as in the embodiment.

C50/60Hz 100VU As is clear from Table 2, the fixation according to the present invention
By using a secondary core, we were able to obtain the same characteristics as the conventional example even if we reduced the stacking thickness by 15% and used a 17% smaller operating capacitor. As described above, according to the present invention, it is possible to provide a washing machine motor with excellent characteristics, which has a thin stator core and a small capacitance of an operating capacitor. Can be done.

[Brief explanation of the drawing]

Figure 1 shows the flat i]tl factor of the stator core of an induction motor, and the second
It is a diagram showing the initial characteristics of the SS motor when changing p/hys·P.

Claims (1)

[Claims] (1) @Inner diameter of the stator core of a conductive motor? D, tooth width (lt8, number of slot grooves YrS
1. A stator core for a conductive motor, characterized in that the yoke and tooth slots of the stator core are formed so that the yoke height is hys and the number of strokes is P.