JPS5846859A - Synchronous motor - Google Patents

Abstract

PURPOSE:To simplify the machine processing on the yoke of the titled motor by a method wherein the outer peripheral surface of the yoke, whereon a permanent magnet is pinched, is formed into a circular arc shape in such a manner that the shape is approximated to the prescribed function with which the magnetic flux density distribution will make a sine-wave form. CONSTITUTION:A rotor having six yokes 2-1-2-6 and six permanent magnets 3-1-3-6, for example, which are alternately arranged at equal intervals, is arranged in the center part of the stator 1 whereon a magnetic iron plate was laminated. At this point, when the angle from the center line of the permanent magnets is set at theta and the magnetic flux density distribution between the stator 1 and the yokes is made into a sine-wave form, as there exists relations pertaining to the gap length between the stator 1 and the yokes of Lg(theta)=a/sintheta (a is constant), the outer peripheral surface is formed into a circular arc shape having the centers O1 and O2 and a radius R, approximating by applying the method of least squares on the above formula.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synchronous motor, and in particular to improving the air gap between a stator and a spout.

Generally, a synchronous motor consists of a stator in which electromagnetic iron plates are laminated and woven together, and a rotor provided in the center of the stator. For example, if it is a 6@ synchronous motor,
The rotor consists of six breams arranged at equal intervals, six permanent magnets placed between each yoke, and a shaft at the center. For controllability such as obtaining uniform torque characteristics in such a synchronous motor, it is important that the magnetic flux density distribution between the stator and rotor (in this case, the yoke) has a spatially sinusoidal shape. be.

Conventionally, when determining the threshold air gap length between the stator and rotor (N-ri) mentioned above, it was done using a complicated design based on factors such as the materials of the stator and l-ri, the magnetic force of the permanent magnets, etc. 9. Furthermore, the shape of the outer surface of the resulting slag is also special, which makes machining difficult and increases the production cost.

An object of the present invention is to focus on the fact that most of the magnetic resistance in the single magnetic path formed by the rotor is due to the air gap, and to improve the air gap length L.
g(#) t Lg (θ=Sll#', where l is a 'iii number, # is approximately approximated to the angle from the center line of the permanent magnet, and the outer circumference of d-ri IJillit-circle rA shape, and the machine/ 1-
The problem with the conventional type mentioned above is to be solved.

The present invention will be explained below with reference to the drawings.

Figure 1 relates to the present invention;b 1WIIA motor V) Shown in a top view o #I In Figure 1, an electromagnetic iron plate is laminated on l #L7t stator, and the axial direction of the inner circumference is Volume-
(not shown) is applied. The center sK of the stator l is 6116DB-/(I14Fc12-1-2-6.6
A rotor consisting of permanent stones 3-1 to 3-6 and a shaft 4 is arranged. That is, yokes 2-1 to 2-2
-6 is excited to a predetermined pole by the permanent magnets 3-1 to 3-6 placed between them.For example,
If a-ri 2-1.2-3.2-5 is the north pole, yoke 2-2.2-4.2-6>x8te6b.

Figure 2 is a partially enlarged view of Raku 11, and shows the S of stator 1.
In Figure 9, the Lg1 clause is the angle between the center of the permanent magnet 3-1 and the stator 1 and the rotor (in this case, the angle is 2-1 degrees). 2-2) and O
＠O Stator 1 and Socket 2-1 showing the air gap length
．． Ill straight forward B in the air gap between 2-2 (
#) is, from the controllability of the description,
In (1), it is preferable to pay attention to the fact that in the closed-loop circuit C in the figure al12, the magnetic resistance is mostly occupied by the air gap. The −10 force is given by the amount of money consumed in the air gap by 1. As a result, if the magnetic field in the air gap is H(#).

H (#) - L recommendation (#): Mu (constant) ToI, therefore, LH (#) ''π 100 μm n (phrase - a (2) Since it is 19, a becomes a constant. As shown in the figure, stator 1 and 2-1 (left half of 1 shown) or 2-2 (right half of the diagram) and 0
The 1% aO air gap length can be expressed by a simple formula.According to the present invention, the outer circumferential surface of the yoke is shaped into an arc in order to facilitate machining. For example, in order to approximate the arc shape to the ta formula, the capacity aK can be calculated using the method of least squares. 112
In the figure, the radius of this arc is B, the center is o,
, L), In the above embodiment,
Although a 6-pole internal motor is shown, of course the present invention and other OP
According to the present invention, while maintaining the magnetic flux vIi degree distribution in the air gap between the stator and rotor in a sinusoidal shape, the outer periphery of the W-plane can be applied in an arc shape. Therefore, machining is easy, and therefore, it is advantageous in terms of manufacturing cost. Ol which is a partial enlarged view of 11111: Stator, snow! -1~3-sing; uniform (IIl iron) 3-1゛~S-
@: Permanent monument 4 snow shaft.

good permit applicant Fujitsu Fanuc Corporation Kinsha Tatami permit application agent Patent Attorney Akira Makoto Patent attorney Kazuyuki Ryo Tate Patent attorney Akira Yamaguchi

Claims (1)

[Claims] 1. A synchronous motor comprising a stator, at least two yokes provided at equal intervals in the center of the stator, and a good permanent magnet provided between the yokes. The air gap length Lg between the stator and each yoke is
a) t- L, ($) --,. However, a is a constant, 0 is the angle from the center line of the permanent magnet, and the outer circumferential surface of each of the above is made into an arc shape.