JPS5986466A - Permanent magnet field synchronous machine - Google Patents

Abstract

PURPOSE:To reduce the leakage magnetic flux and to improve the magnet utility rate by bonding a thin plate of permanent magnet to the surface of a rotor which faces an air gap of stator teeth, and suitably determining the pitch of the poles of the permanent magnet. CONSTITUTION:A rotor is formed of a cylindrical laminated core, on the outer periphery of which teeth of equal pitch are cut and has rotor teeth of the number Nr. A stator 31 is opposed to the rotor through an air gap, and a thin plate of a permanent magnet 34 is bonded to the surface faced with the air gap of the stator teeth. The permanent magnet 34 is magnetized in N- and S-poles at the equal pitch so that the adjacent poles have different polarity from each other. In this case, a relation of Ns=2(Nr+ or -Np) is provided, where Np is integer number 1 and more. Stator grooves 32 are half- or fully-opened, and polyphase 2Np poles are wound in a distributed winding.

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, the rotor has a toothed laminated core, the stator has a laminated core, and a permanent magnet is attached to the surface facing the air gap, and the stator groove has a multiphase distributed winding. This invention relates to a synchronous machine whose field is a wound permanent magnet.

Conventionally, permanent magnet field Fii? In a synchronous machine, that is, a hybrid type step motor, a permanent magnet is attached to the rotor in a homopolar type that passes magnetic flux in the axial direction, so it is a hybrid type step motor.
If you aim for M, :'Uli-like Chiyu using 8 stones, the core lamination will be extremely short (, rx 181 Uri, the air gap magnetic flux density will not be made into a cylinder, and the It has the disadvantage that a large motor cannot be obtained.This homopolar type has a structure long known as a slow thin type.

Currently, Slow Shinnohi's high-crit motors on the market use island magnetic flux density materials such as Alnico and Reya Earth as permanent magnets, but even so, in order to obtain a large (core lamination/diameter) ratio, this magnet is Difficult construction methods had to be used, such as stacking three pieces together with the core.

Figure 1 shows the structure of a conventional homopolar step motor.
).

11 is a rotating shaft made of non-magnetic material, 12 is a circular-shaped permanent grinding stone with N and S poles celadon in the direction of the rotating shaft;
It is provided with toothed portions 13 and 14 in accordance with the rules, and is fixed to the rotating shaft l]. The teeth 13 and 14 are positioned so that the teeth and grooves alternate.

15 is a stator core whose outer periphery is surrounded by an outer frame 17, around which a coil I6 is wound, and which faces the rotor teeth iB 13 and 14. It has a tooth area. Rotor tooth piece 10: (, 14 and [
i! ;l The electronic cores 15 are each made of a laminated iron core. In other words, the density of the air gap magnetic flux φ could not be obtained unless the thickness of the core product 4 of the tooth portion It, 14 was made thin.

As described above, the conventional motor has a permanent weight installed far away from the air gap b between the stator and the mouthpiece. Therefore, the leakage magnetic flux was large, and the Mζ stone utilization rate was 7jX poor.

Here, in the present invention, a thin plate magnet is pasted in the gap of the 1^1 stator to reduce leakage and increase the usability, and the coercive force is applied to the demagnetizing force directly received by the armature 1 magnetic force. It is an object of the present invention to provide a permanent magnet field magnet using a square permanent f1 magnet (such as a layered earth magnet).

The structure of the present invention is as follows.

The rotor U consists of a cylindrical laminated core with a rounded pitch on its outer periphery, and the number of teeth is N.

The IQ=1 constantor is a laminated iron core whose inner peripheral surface is formed so as to face the rotor in the AJ direction through a gap. stone v:'
t: 4) The i is pasted, and the adjacent magnetic poles are celadonized into Nll poles at equal pitches so that they have different polarities. The relationship is 1 kari 2 (Nr 1 N,).

Here, N is an integer greater than or equal to 1. Kak1c11 stator groove is half open or closed, multi-phase 2Np4M distributed winding @j
ji is wrapped.

2Nr realized by making rj in this way
The present invention is based on the first term.

Next, embodiments of the present invention will be described.

FIG. 3 is a front cross section (9) of Example 1 of the present invention.

In this example, the number of rotor teeth Nr = 4 and the number of stator grooves and poles are equal to N = 2 (4 + 1) = 1
The case of 0 is shown.

Since the size N = 1, 2N = 2 distribution winding p of polar polyphase A rope 33 is applied to the stator groove 32.

11. A permanent magnet 34 with NwL and S poles is pasted on the fixed surface formed on the inner circumference of the weight element 31, as shown in 1shi1, and constitutes a field with ■poles.

When the salient poles of the rotor 35 are aligned with the teeth of Nwl, that 1
800m force, Tasari pole S L! j 'C aligned and dyeable φ
creates a mountain road with two poles.

When the rotor 35 rotates clockwise from the point where the rotor protrusion 1fL, r1 coincides with the stator tooth S, the 1φ1 trochanter salient pole r2 and the stator tooth S2 first coincide, and i
f? The bundle φ is transferred from the barbed stator teeth S to the stator teeth S2.

When the rotor salient pole r3 and stator NJS coincide, the magnetic flux φ moves to the stator tooth S, and the rotor salient pole r4
and stator tooth S4 coincide, and the hR bundle φ has stator tooth S4.
Move on to 4. In this way, IL! J trochanter salient pole r1
→Magnetic flux φ at stator tooth S5 → Fixed gear tooth 5, and magnetic flux φ at rotor salient pole r2 →IAI stator tooth S
→→Stator tooth S, and the magnetic flux φ makes one revolution here.

That is, when the rotor 35 rotates 90 degrees, the magnetic flux φ becomes 36
Rotate 0°. When the rotor 35 rotates once, the armature winding 3
A voltage of 4 cycles is generated at 3K.

Therefore, this machine v1. It operates as an 8-pole synchronous machine.

FIG. 4 is an external view of another embodiment 19 of the present invention.

This other embodiment is one in which the cycle 1 (11 turning points) of the present invention is formed in a linear motor.

The rotor 35 is a rail-down VC, and the stator 31 is a movable element.

ηq bed Nll of the stator 31 is made equal to the actual number of poles of the permanent weight 34, but the stator r/IJ: number is especially
There is no need to match sK.

For example, N, more stator grooves; choose the number of grooves 32, polyphase 2N, distribution winding of the object Ym 3: Saki I) 111, stator facing this gap: N8 on the inner surface of '31. A structure in which a thin cylindrical permanent magnet 34 with a thickness of Nm is attached inside is more common.

Therefore, the number of stators in the present invention can be freely selected and determined to facilitate winding. 2(N, soil N,) = N, of N
8rL is the number of magnetic camellias of the cylindrical 6B stone provided in this stator inner rod 1, and is created regardless of the number of grooves due to harmful effects on this.

Thus, according to the present invention, the number of grooves is more than twice as large as that of a conventional electric motor, and the magnetomotive force distribution of the windings can be made uniform, and it is also easy to use multiple phases.

In addition, the rotor has a simple structure and is durable enough to withstand high speeds, high temperatures, and shocks.

Furthermore, there is no factor that causes the characteristics to deteriorate.

Note that if the rotor does not include a permanent magnet, when a linear motor is used, the stator is an 0J-Luri element, and the rotor is a rail, the rail structure is simple and inexpensive, which is a great advantage.

Possible applications of the present invention include Zorashiless DC serge motors, stepping motors, linear motors, father-flow tachogenerators, linear father-flow tachogenerators, high-rise single-flow generators, high-speed motors, and the like.

[Brief explanation of drawings]

Figures 1 and 2 are 11+11 cross-sectional views and front ntY plane views showing the structure of conventional homo, +5-L type step motors, and No. 31 is a front cross-sectional view showing positive acid that can be used to implement one embodiment of the present invention. FIG. 4 is a perspective view of a glue motor as another embodiment of the present invention. 1-8...Stator teeth, 1'-9'...Rotor teeth, 1
1...Rotating shaft, 12...Permanent 6R stone, 13, 14
... rotor, I5 ... stator, 16 ... coil,
17...Outer frame yoke, 3■...Stator, 32...1
! 1 stator groove, 233... ton) Front winding, :(・1...
・Permanent 68 stones (for example, rear magnet): 35・
...rotor. Applicant's agent Kiyoshi Inomata

Claims (1)

[Claims] 1. The rotor consists of a cylindrical laminated iron core with teeth cut at an equal pitch on the outer periphery, and the number of teeth is N.
The stator has an inner circumferential surface facing the rotor with a gap in between. A thin plate of permanent 6R stone is pasted on the surface of the JP, and grooves are placed so that adjacent magnetic poles have different polarities.
8 = = 2 (Nr±N,), (where N is an integer), and the stator groove that accommodates the windings is half open or closed, and multiphase 2N pole distributed windings are wound. A permanent magnet field synchronous machine that makes the process of becoming more difficult. 2. The stator is cut and expanded along the axis at one end in the direction of the rotating shaft to form a flat plate, and the rotor is also expanded into a flat plate along the axis, thereby converting the stator in item 11 into a movable element. and m 141J The permanent magnet field jTη period machine described in the range 1 of the special edition 1〈, which forms a linear motor using a 141J rotor as a rail.