JPS61191248A - Concentrated winding induction machine with teeth at large pitch - Google Patents

Abstract

PURPOSE:To reduce leakage flux and the weight of a core, by providing windings for concentrated winding in grooves provided for a laminated core, to connect the windings by a specified means, and by forming a stator fixing a permanent magnet on each magnetic pole. CONSTITUTION:Half-closing or opening grooves 12 are provided for the inner peripheral face of a laminated core 11 at equal intervals, and m phase windings 13 for concentrated winding are contained in the grooves. On the windings 13, the phase difference of each pi/m is arranged between electrical angles, and windings with phase difference of each pi are mutually connected in counter- series to be phase windings. Also, on the inner peripheral face of the magnetic poles of the stator core, permanent magnets 14 are fixed alternately with poles N or poles S to form a stator 1. A tooth-gear-shaped rotor 2 having salient poles 21 different from stator poles in quantity is made to confront the inner peripheral side of the stator 1 via space. By the method, efficiency and power factor can be improved on an induction machine with teeth at large pitch.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides permanent protection between the air gap between the armature and the inductor! i also relates to a concentrated winding inductor machine with a large tooth pitch and equipped with a magnetic field.

[Problems with conventional technology]

Conventionally known inductor machines with a tooth pitch of several centimeters or more include inductor type non-commutator motors and linear synchronous motors, but from the magnetomotive force source of the field to the inductor teeth. Since the magnetic path length is long and follows a complicated path, there is a drawback that the leakage magnetic flux is large and the mold seedlings are large.

In addition, inductor machines with a small tooth pitch are equipped with electromagnets and permanent magnets in the fixed and child parts. However, as the tooth pitch of the stator becomes larger, the thrower where the electromagnet is housed; the tooth pitch of the topid and the salient pole, and the number of pole pairs of the permanent magnet become closer. The structure in which a multi-pole permanent magnet is provided for one electromagnet has the disadvantage that the modulation rate of permeance is small and the utilization of magnetic flux is poor.

[Purpose of the invention]

Here, the present invention provides a method for installing permanent magnets with air gaps.
The purpose of this invention is to provide a concentrated winding inductor machine with a large tooth pitch, which has a small magnetic flux and a large reduction in iron core type R, and is provided with a permanent magnet of N pole or S pole for one electromagnet.

[Key points of the invention]

The present invention uses a cylindrical laminated iron core as a stator, on the inner circumferential surface of which Ns grooves are cut in the axial direction at close intervals, and in these grooves there are
The phase windings are housed, and if k is an integer of 1, then N = 2mk, and this potential is semi-closed ['' or CNs product Fi iron cores with N5 thin plate-like permanent A magnet is pasted on the right 1J,
Adjacent permanent magnets are magnetized so that they have different polarities
2m mutually adjacent windings of m phase forming an r-pole field have an electrical angle of π/
Windings having a phase difference of m and a phase difference of π are connected in anti-series to form a phase winding, and the rotor is a gear-shaped laminated layer fixed to a rotating shaft that is rotatably supported. This is a concentrated winding inductor machine with a large tooth pitch, in which the number of salient poles Nr of the iron core is selected to be N - (m±1)k.

〔Example〕

A front sectional view of an embodiment of the present invention is shown in FIG.

This shows a two-phase six-pole inductor rotating machine.

The stator 1 has a cylindrical laminated core 11, and N3 (4) vortices 12 are cut at equal intervals in the direction of the axis 22 on the inner peripheral surface of the core 11. M-phase (two-phase) windings 13 are housed, and when k is a positive integer, it is N −2mk .

This groove 12 is semi-closed or open and has N5 V4 layer cores 1.
N3 thin plate-like permanent magnets 14 are attached to the tooth head of tooth 1 [
The permanent magnets 14 adjacent to each other are magnetized to have different polarities to form a field with Ns polarity.

The 2m adjacent windings 13 of m phases have a phase difference of π/m in electrical angle, and the windings 13 having a phase difference of π are connected in anti-series to form a phase winding. This is shown in FIG. 2, where the mark 1o indicates the beginning of winding α, ■, etc.

The rotor 2 is rotatably supported by a rotating shaft 22.
The number of salient poles Nr (
3 pieces) are selected as Nr=(m±1)k.

That is, the rotor 2 has three salient poles, and the machine is a six-pole synchronous machine. Stator 1 has 4 grooves and is concentratedly wound with α, β, a, ? A winding wire 13 is provided, and the tooth heads surrounding this winding wire 13 are magnetized with NrS and NrS, respectively! A permanent magnet 14 is attached.

Note that the number of grooves Nr=4. Number of phases m-21 Number of rotor salient poles N
=3, so Nr=(2-!1)Xi holds true.

However, regarding the α-phase winding 13, when the salient poles of the rotor 2 coincide with the α magnetic poles, d! Rotor 2 is on the I pole
The four poles are facing each other.

The magnetic flux φ flowing through the α magnetic pole is the maximum, and the magnetic flux φd flowing through the d magnetic pole is the minimum. Since the α-phase winding consists of five α-windings connected in series, this interlinkage magnetic flux is φ. −φ
(X” is present, plus maximum, rotor 2 is 60°
As it rotates, the α magnetic pole faces the four poles of the rotor 2, and the d magnetic pole faces the salient pole, so φ. −φη becomes the maximum negative value.

In this way, when the rotor 2 rotates 120', the magnetic flux of the α-phase winding fluctuates by one recycle. In the β-phase winding, fluctuations in magnetic flux occur at a mechanical angle of 90" behind this.12
Since 0° mechanical angle corresponds to 360° electrical angle, mechanical angle 9
0° corresponds to 270° electrical angle. 270' = 360
Since the angle is −90°, the β-phase winding has an electrical angle of −90°.
The phase windings constitute two phases.

FIG. 3 is a front sectional view of another embodiment of the present invention, and FIG. 4 is a connection diagram of its windings.

In all the drawings, the same symbol P3 also indicates the same or corresponding parts.

It represents a three-phase (tJ, V, W>8-pole inductor rotating machine), and its operation is similar to that of a two-phase machine.

The following means can be considered as another embodiment of the present invention.

a) It is clear that a cylinder can be cut into a flat near motor by cutting x-x' in Figure 1, and this is shown in Figure 5.

b) When the number of winding phases m≧3, the mechanical angle is 180 to each other.
If the winding 13 at the position of 0.degree. is connected with the same polarity, that is, U-U, instead of U-U as shown in FIG. 4, the following number of salient poles Nr - (m±2)k is possible. However, the electrical angle phase difference between adjacent winding magnetic poles is 2π/m. This conceptual diagram is not shown in FIG.

〔Effect of the invention〕

Thus, the present invention improves the permeance modulation rate by nearly twice as compared to relatively high-speed linear motors and DD (formerly rect drive without deceleration mechanism) motors that make noises with a tooth pitch of several centimeters or more, and improves efficiency and efficiency. An electric motor with a good power factor can be obtained, and the structure is balanced and easy to manufacture (therefore, the cost is also low).

[Brief explanation of drawings]

Fig. 1 is a front sectional view of one embodiment of the present invention, Fig. 2 is a winding connection diagram, Figs. 3 and 4 are front sectional views of other embodiments of the invention, and 1st winding connection diagram. 5 and 6 are conceptual diagrams of another embodiment of the present invention. 1... Stator 11... Stator core 12... Stator groove 13... Winding □ 14... Permanent magnet 2... Rotor 21... Rotor core (ultimate) 22 ···Axis of rotation. Applicant's agent Kiyoshi Inomata Engraving of the drawing (no change in content) yl Figure 1 Figure 2 Leap Figure 3 Figure 4 Figure 5 Figure 6 Procedural amendment (method) % formula % 1 Display of the case 1986 Year Patent Application No. 29960 2 Name of the invention Concentrated winding inductor machine with a large tooth pitch 3 Relationship to the case of the person making the amendment Patent applicant (662) Yaskawa Electric Co., Ltd. Il! Factory 4 agent May 8, 1985

Claims (1)

[Claims] 1. The stator is a cylindrical laminated iron core, and N_s grooves are cut in the axial direction at equal intervals on the inner peripheral surface of the core.
The phase windings are stored, and if k is a positive integer, then N_s = 2mk, and this groove is semi-closed or open, and N_s thin plate-like permanent magnets are attached to the tooth heads of the N_s laminated cores. The adjacent permanent magnets are magnetized so that they have different polarities, and N_s
2m mutually adjacent windings of m phase forming a pole field have an electrical angle of π/
Windings having a phase difference of m and a phase difference of π are connected in anti-series to form a phase winding, and the rotor is a gear-shaped laminated core fixed to a rotatably supported rotating shaft. A concentrated winding inductor machine with a large tooth pitch, characterized in that the number N_r of salient poles is selected to be N_r=(m±1)k. 2. The concentrated winding guide with a large tooth pitch as set forth in claim 1, which is formed by cutting the stator and rotor along the radial direction connecting the axis of the rotating shaft and the center of the groove and developing them into a planar shape. Cordless handset. 3. When the number of phases of the stator windings is m≧3, connect the windings located at 180° mechanical angle to each other with the same polarity, and set the number of salient poles of the rotor N_r=(m±2)k. A concentrated winding inductor machine with a large tooth pitch according to claim 1.