WO2012031475A1

WO2012031475A1 - Stator iron core of irregular slotted disc type motor

Info

Publication number: WO2012031475A1
Application number: PCT/CN2011/072051
Authority: WO
Inventors: 叶芃; 叶常彬
Original assignee: 叶羽经
Priority date: 2010-09-07
Filing date: 2011-03-22
Publication date: 2012-03-15
Also published as: CN101938169A

Abstract

A stator iron core (1) of irregular slotted disk type motor is provided. Radial slots (2) are evenly distributed in the iron core(1). Each slot (2) is wider and shallower towards the outer periphery of the iron core (1) and narrower and deeper towards the inner periphery of the iron core (1), so that the sectional area of each slot (2) is constant at any plane perpendicular to the radial direction. The ratio of the width of the tooth (3) and the thickness of the yoke (4) both located at the outer periphery of the iron core (1) is substantially equal to the ratio of the width of the tooth (3) and the thickness of the yoke (4) both located at the inner periphery of the iron core (1). In the magnetic path from the outer periphery to the inner periphery of the iron core (1), the magnetic flux density of the teeth (3) and that of the yoke (4) are substantially equal. The saturation problem of local magnetic path of the stator iron core of the disc type motor is solved by the improved slots (2). The temperature rise of the motor is effectively reduced, and the efficiency of the motor is enhanced.

Description

Special-shaped slot disk motor stator core

Technical field:

The invention belongs to the technical field of electric motors, and in particular relates to an improvement of a stator core of a special-shaped slotted disc motor.

Background technique:

In the conventional disc motor technology, the grooves and teeth on the plane of the stator core are radially distributed. When the motor is working, the magnetic lines on the rotor pass through the air gap, the stator teeth, the stator yoke, the stator teeth of the adjacent poles, the air gap, and the rotor to form a magnetic circuit. The wires in the slot and the magnetic lines in the circuit generate electromagnetic induction. .

Conventional disc stator core: In order to make the stator convenient, the outer shape of the disc stator core and the inner circle are the same, which results in excessive tooth width at the outer circumference of the stator and the tooth width at the inner circumference of the stator. Too small, and the yoke at the outer and inner circles of the stator are equal, thus causing the ratio of the tooth width at the outer and inner circles to the thickness of the yoke to be unequal, that is, on the outer circumference, the magnetic path cross-sectional area of the tooth The cross-sectional area of the magnetic path of the yoke portion is larger; on the inner circumference, the cross-sectional area of the magnetic path of the tooth portion is smaller than the cross-sectional area of the magnetic path of the yoke portion. In the outer circumference yoke, the magnetic flux density is larger than the tooth portion, and the inner circumferential tooth portion has a larger magnetic flux density than the yoke portion. On different circumferences, the magnetic flux density of the teeth and the yoke differ greatly, and the outer circumferential yoke portion and the inner circumferential tooth portion have magnetic properties. The road is highly saturated, causing defects in high stator temperature, material waste, and low motor efficiency.

This is especially true when the diameter ratio of the outer and inner circles of the core exceeds 1.7:1.

Summary of the invention:

SUMMARY OF THE INVENTION An object of the present invention is to provide a stator core of a profiled disk disk motor in which the groove shape is an equal-area staked shaped groove and the magnetic circuit of the outer yoke portion and the inner scallop portion of the core is improved.

The technical solution of the present invention is realized as follows: a stator core of a special-shaped slot disk motor, the iron cores are evenly distributed with radial wire grooves, characterized in that the outer circumference of the iron core is wide and shallow, and the inner circumference is narrow. And deep, and into the same area to stake out the shaped groove structure. The tooth width at the outer circle is made to be larger than the thickness of the yoke, and the tooth width at the inner circle is close to or tends to be equal to the thickness ratio of the yoke portion, reducing or avoiding saturation of the local magnetic circuit.

The ratio of the width of the tooth portion to the thickness of the yoke at the outer round end and the ratio of the width of the tooth portion at the inner round end to the thickness of the yoke portion are not more than 20%.

The radial wire grooves are radially evenly distributed on the iron core.

The radiation grooves are evenly distributed on the iron core at an angle to the radial direction.

The invention has the novel idea, improves the magnetic circuit structure through the improvement of the wire groove, reduces or avoids the defects of the magnetic circuit saturation, effectively reduces the temperature rise, and improves the motor efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS:

The present invention will be further described below in conjunction with specific legends:

Figure 1 is a schematic view of a 12-slot disc stator core

Figure 2 Schematic diagram of a 12-slot disc stator core

Figure 3 is a perspective view of a 18-slot disc stator core

Figure 4 Schematic diagram of the end face of a 18-slot disc stator core

Figure 5 is a three-dimensional schematic diagram of a 36-slot disc stator core

Figure 6 Schematic diagram of a 36-slot disc stator core

among them

1—iron core 2-line groove 3—tooth 4—yoke

detailed description:

Referring to FIG. 1, FIG. 2, FIG. 5 and FIG. 6, the wire slot 2 of the stator core 1 of the disk motor is formed into an equal-area shaped groove structure, that is, the cross-sectional area on the different circumferences is equal, and the groove full rate after embedding the coil Is equal. The wire trough 2 is evenly distributed on the iron core 1 in a radial direction, wherein the wire groove 2 at the outer circumference of the iron core is wide and shallow, and the width of the tooth portion 3 becomes smaller than that of the conventional technique, and the thickness of the yoke portion 4 is thickened, The ratio is smaller; the groove 2 at the inner circle is narrow and deep, and the width of the tooth portion 3 becomes larger than that of the conventional technique, and the thickness of the yoke portion 4 becomes thinner, and the ratio between the two becomes larger; the outer core and the inner circle are both extremes. The ratio of the width of the tooth portion to the thickness of the yoke portion gradually approaches or equals. In the magnetic circuit from the outer circle to the inner circle, the magnetic flux density of the teeth and the yoke is substantially the same, and local magnetic saturation is avoided. Therefore, the ratio of the diameter of the outer circumference of the core to the inner circle may exceed 2:1, and the ratio of the width of the tooth at the outer end to the thickness of the yoke is different from the ratio of the width of the tooth at the inner end to the thickness of the yoke. The iron core with a diameter ratio of not more than 20%, especially in the outer diameter of the outer circle and the inner circle, the ratio of the width of the tooth portion to the thickness of the yoke at both ends can be equal, that is, the ratio is zero.

1 and 2 are 12-slot disc stator cores, and Figs. 5 and 6 are 36-slot disc stator cores.

The number of the above slots is designed according to the requirements of the motor for the number of revolutions and the number of pole pairs, and may be various numbers of slots such as 24 and 48.

Referring to Figures 3 and 4, there is an 18-slot disc stator core, and the radial trunking 2 is evenly distributed on the core 1 at an angle to the radial direction, which improves the waveform of the motor output.

Claims

The stator core of the special-shaped slot disk motor is provided with a radial wire slot, which is characterized in that the outer circumference of the iron core is wide and shallow, and the inner groove is narrow and deep, and is shaped into an equal area. Slot structure.
A stator core of a profiled slot disk motor according to claim 1, wherein the ratio of the width of the tooth portion at the outer round end to the thickness of the yoke portion is different from the ratio of the width of the tooth portion at the inner round end to the thickness of the yoke portion. More than 20%.
A stator core of a profiled slot disk motor according to claim 1, wherein the radial wire grooves are radially evenly distributed on the iron core.
A stator core of a profiled slot disk motor according to claim 1, wherein the radial wire grooves are evenly distributed on the iron core at an angle to the radial direction.