CN219227300U

CN219227300U - Rotor punching sheet used on permanent magnet motor and permanent magnet motor

Info

Publication number: CN219227300U
Application number: CN202320016303.7U
Authority: CN
Inventors: 李文成; 黄家友; 鲁方春; 尚健
Original assignee: Anhui Mingteng Permanent Magnetic Machinery & Electrical Equipment Co ltd; BEIJING MINGCHENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
Current assignee: Anhui Mingteng Permanent Magnetic Machinery & Electrical Equipment Co ltd; BEIJING MINGCHENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
Priority date: 2023-01-04
Filing date: 2023-01-04
Publication date: 2023-06-20
Anticipated expiration: 2033-01-04

Abstract

The embodiment of the utility model provides a rotor punching sheet for a permanent magnet motor and the permanent magnet motor, and belongs to the technical field of permanent magnet motors. A plurality of conducting strip grooves are formed in the outer periphery of the rotor punching sheet at intervals, a plurality of magnetic steel grooves are formed in the rotor punching sheet, a first end of each magnetic steel groove is close to a central hole of the rotor punching sheet relative to a second end of each magnetic steel groove, and the conducting strip grooves opposite to the second ends of the magnetic steel grooves along the radial direction of the rotor punching sheet are communicated with the outer peripheral wall of the rotor punching sheet through opening channels. The rotor punching sheet can reduce magnetic leakage, and can improve the back electromotive force amplitude of the permanent magnet motor and increase the starting torque multiple of the permanent magnet motor.

Description

Rotor punching sheet used on permanent magnet motor and permanent magnet motor

Technical Field

The utility model belongs to the technical field of permanent magnet motors, and particularly relates to a rotor punching sheet for a permanent magnet motor and the permanent magnet motor.

Background

The permanent magnet motor has the advantages of high efficiency, good energy-saving effect, capability of omitting a transmission, a gear box and the like, gradually replaces an asynchronous motor and gear structure, and is spreading in a large area in the industrial field. But permanent magnet motors do not have self-starting capability and must be equipped with a frequency converter for starting. The permanent magnet motor capable of self-starting has the starting capability like an induction motor because the rotor is provided with the starting winding, but because the rotor of the self-starting permanent magnet motor is provided with magnetic steel and starting conducting bars, the space is compact, and therefore the problems of overhigh magnetic leakage coefficient and insufficient starting capability exist.

Disclosure of Invention

In view of the foregoing problems of the prior art, an object of an embodiment of the present utility model is to provide a rotor sheet for a permanent magnet motor, which can reduce magnetic leakage.

The technical scheme adopted by the embodiment of the utility model is as follows:

a rotor punching sheet for a permanent magnet motor, a plurality of conducting bar grooves are formed in the outer periphery of the rotor punching sheet at intervals, a plurality of magnetic steel grooves are formed in the rotor punching sheet, a first end of each magnetic steel groove is close to a central hole of the rotor punching sheet relative to a second end of each magnetic steel groove, and the conducting bar grooves opposite to the second ends of the magnetic steel grooves in the radial direction of the rotor punching sheet are communicated with the outer peripheral wall of the rotor punching sheet through opening channels.

Further, the guide bar groove is a rectangular groove.

Further, the open channel penetrates to a first side wall of the bar guide groove opposite to the outer peripheral wall of the rotor punching sheet.

Further, the width dimension of the open channel is at least half the length dimension of the first sidewall of the bar guide groove.

Further, the magnetic steel groove is a strip-shaped groove or an arc-shaped groove.

The permanent magnet motor comprises a stator punching sheet, a rotor punching sheet used on the permanent magnet motor, magnetic steel inserted in the magnetic steel groove and a conducting bar inserted in the conducting bar groove.

Further, the ratio of the outer diameter of the rotor punching sheet to the outer diameter of the stator punching sheet is 0.75-0.85.

Further, the material of the rotor punching sheet is neodymium iron boron permanent magnet material.

Further, the conducting bars are rectangular copper conducting bars.

Further, stator slots opposite to the conducting strip slots are formed in the stator punching sheet, the number of the stator slots is Q1, the number of the conducting strip slots is Q2, and the number of poles of the permanent magnet motor is 2P, wherein: q1-q2=k×2p, k= ±1 or ±2.

Compared with the prior art, the embodiment of the utility model has the beneficial effects that:

the conducting strip groove opposite to the second end of the magnetic steel groove on the rotor punching sheet is in an opening shape, so that magnetic force lines of the opening part are not closed by themselves, the magnetic leakage problem of the rotor punching sheet can be reduced, and the utilization rate of the magnetic steel fixed on the rotor punching sheet is improved.

Drawings

Fig. 1 is a schematic structural diagram of a rotor sheet according to an embodiment of the present utility model, in which magnetic steel is shown;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is a schematic diagram of an assembly structure of a rotor punching sheet and a stator punching sheet in a permanent magnet motor according to an embodiment of the present utility model;

fig. 4 is a comparison diagram of voltage variation of a permanent magnet motor provided by the embodiment of the present utility model and a conventional permanent magnet motor along with starting time, wherein a solid line represents the conventional permanent magnet motor, and a dotted line represents the permanent magnet motor of the embodiment.

In the figure: 1-stator punching sheet, 2-rotor punching sheet, 3-conducting bar groove, 4-magnetic steel groove, 5-opening channel, 6-magnetic steel, 7-stator groove and 8-conducting bar.

Detailed Description

In order to keep the following description of the embodiments of the present utility model clear and concise, the detailed description of known functions and known components thereof have been omitted.

As shown in fig. 1, the embodiment of the utility model provides a rotor punching sheet 2 applied to a permanent magnet motor, wherein a plurality of conducting strip grooves 3 are arranged on the outer periphery of the rotor punching sheet 2 at intervals, a plurality of magnetic steel grooves 4 are arranged on the rotor punching sheet 2, and a first end and a second end of each magnetic steel groove 4 are close to a central hole of the rotor punching sheet 2.

Further, as shown in fig. 2, the second end of the magnetic steel groove 4 is communicated with the outer peripheral wall of the rotor sheet 2 through an opening passage 5 along the guide bar groove 3 facing in the radial direction of the rotor sheet 2 so that the guide bar groove 3 is opened.

The radial direction of the rotor blade 2 of the present embodiment refers to the direction along which the radius thereof extends.

The conducting strip groove 3 opposite to the second end of the magnetic steel groove 4 on the rotor punching sheet 2 is in an opening shape, so that magnetic lines of force of the opening part are not closed by themselves, the magnetic leakage problem of the rotor punching sheet 2 is reduced, and the utilization rate of the magnetic steel 6 fixed on the rotor punching sheet 2 is improved.

In some embodiments, as shown in fig. 2, the conducting bar groove 3 of the present embodiment is a rectangular groove, a side wall of the conducting bar groove 3 opposite to the outer peripheral wall of the rotor punching sheet 2 is a first side wall, and the open channel 5 penetrates to the first side wall.

The width dimension of the open channel 5 of this embodiment is at least half the length dimension of the first side wall of the guide slot 3.

Of course, in other embodiments, the guide bar groove 3 may be a circular groove. Correspondingly, the width dimension of the open channel 5 is at least the dimension of the radius of the guide groove 3.

As shown in fig. 1, in some embodiments, the magnetic steel grooves 4 may be bar-shaped grooves or arc-shaped grooves, and the magnetic steel grooves 4 are disposed obliquely on the rotor sheet 2 such that the first ends thereof are close to the center hole of the rotor sheet 2 with respect to the second ends thereof.

The embodiment of the utility model also provides a permanent magnet motor, as shown in fig. 3, which comprises a rotor punching sheet 2, the stator punching sheet 1 described in any one of the above embodiments, magnetic steel 6 inserted in the magnetic steel groove 4 and a conducting bar 5 inserted in the conducting bar groove 3, wherein the rotor punching sheet 2 is arranged inside the stator punching sheet 1.

The ratio of the outer diameter of the rotor sheet 2 to the outer diameter of the stator sheet 1 of this embodiment is between 0.75 and 0.85. Preferably, the ratio is between 0.75 and 0.78.

Further, the material of the rotor punching sheet 2 in this embodiment may be a neodymium-iron-boron permanent magnet material; the conducting bars 8 are copper conducting bars, and the conducting bars 8 are matched with the conducting bar grooves 3 in shape. For example, the guide bar 8 is a rectangular body or a cylindrical body.

As further shown in fig. 3, stator slots 7 are provided at intervals on the inner periphery of the stator lamination 1, opposite to the guide slots 3 on the rotor lamination 2.

Further, assume that the number of stator slots 7 on the stator lamination 1 of the present embodiment is Q1, the number of rotor bars is Q2, and the number of motor poles is 2P, wherein: q1-q2=k×2p, k= ±1, ±2.

For example, the number of stages of the permanent magnet motor is 6, the number of stator slots 7 on the stator lamination 1 is 72, and the number of bar slots 3 on the rotor lamination 2 is 60. As shown in fig. 4, the structure of the permanent magnet motor was calculated to have a 5% improvement in back emf as compared to the conventional structure. Correspondingly, the starting torque of the permanent magnet motor can be improved by 10%. The permanent magnet synchronous motor is manufactured and successfully operated on a fan, a belt conveyor and the like.

The above description is intended to be illustrative and not limiting, and variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art within the scope of the present disclosure. Also, the above examples (or one or more aspects thereof) may be used in combination with each other, and it is contemplated that the embodiments may be combined with each other in various combinations or permutations.

Claims

1. The rotor punching sheet used on the permanent magnet motor is characterized in that a plurality of conducting strip grooves are formed in the outer periphery of the rotor punching sheet at intervals, a plurality of magnetic steel grooves are formed in the rotor punching sheet, a first end of each magnetic steel groove is close to a central hole of the rotor punching sheet relative to a second end of each magnetic steel groove, and the conducting strip grooves opposite to the second ends of the magnetic steel grooves in the radial direction of the rotor punching sheet are communicated with the outer peripheral wall of the rotor punching sheet through an opening channel.

2. A rotor punching sheet for a permanent magnet machine according to claim 1, wherein the guide bar groove is a rectangular groove.

3. A rotor punching sheet for a permanent magnet machine according to claim 2, characterized in that the open channel penetrates to a first side wall of the bar slot opposite to the outer peripheral wall of the rotor punching sheet.

4. A rotor blank for a permanent magnet machine according to claim 3 wherein the width dimension of the open channel is at least half the length dimension of the first side wall.

5. A rotor punching sheet for a permanent magnet motor according to claim 1, wherein the magnetic steel grooves are bar grooves or arc grooves.

6. A permanent magnet motor comprising a stator punching sheet, characterized in that the permanent magnet motor further comprises a rotor punching sheet for a permanent magnet motor according to any one of claims 1-5, magnetic steel inserted in the magnetic steel groove and a guide bar inserted in the guide bar groove.

7. A permanent magnet motor according to claim 6 wherein the ratio of the outer diameter of the rotor laminations to the outer diameter of the stator laminations is 0.75 to 0.85.

8. A permanent magnet machine according to claim 6 wherein the material of the rotor laminations is a neodymium iron boron permanent magnet material.

9. A permanent magnet motor according to claim 6 wherein the conductors are rectangular copper conductors.

10. The permanent magnet motor of claim 6 wherein stator slots are formed in the stator laminations opposite to the guide slots, the number of stator slots is Q1, the number of guide slots is Q2, and the number of poles of the permanent magnet motor is 2P, wherein: q1-q2=k×2p, k= ±1 or ±2.