CN210016333U

CN210016333U - Rotor with magnetic strips inserted into tooth grooves of iron core and stepping motor

Info

Publication number: CN210016333U
Application number: CN201920938669.3U
Authority: CN
Inventors: 吴勇
Original assignee: Changzhou Fulling Motor Co Ltd
Current assignee: Changzhou Fulling Motor Co Ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-02-04
Anticipated expiration: 2029-06-21

Abstract

A tooth space is arranged adjacent to the edge of the rotor and faces the iron core, the magnetic pole direction of a tooth space convex part is opposite to the magnetic pole direction of the iron core, the magnetic strip is embedded in a tooth space concave part, and the magnetic pole direction of the outer side of the magnetic rack is the same as the magnetism of the iron core facing the magnetic rack. Compared with the prior art, can reduce between the stator and the rotor and fail to act on the magnetic leakage on the tooth, provide efficiency, the energy saving, the step motor who uses this kind of rotor has the moment advantage under same thickness, under the same output torque condition, can choose for use the motor of littleer volume, has wide installation advantage.

Description

Rotor with magnetic strips inserted into tooth grooves of iron core and stepping motor

Technical Field

The invention relates to a rotor, in particular to a rotor with a magnetic strip inserted into a tooth socket of an iron core, and further provides a motor using the rotor.

Background

When magnetic lines of force are transmitted to a stator through a rotor tooth tip to form a closed magnetic field, most of the magnetic lines of force pass through the tooth tip of the stator, but a part of the magnetic lines of force of the stator can pass through a tooth groove of the stator, and the more the magnetic lines of force pass through the tooth tip, the less the magnetic lines of force pass through the tooth groove, the larger the torque of the motor; the smaller the torque of the motor is, as shown in fig. 3.

In order to improve the efficiency of the stepping motor, although it is possible to increase the number of the stator and the rotor to meet the torque requirement, it is not economical, and the size of the motor is certainly as small as possible to be installed and used in a smaller space. In addition, the mode of increasing the number of the stator and the rotor is not energy-saving. The remaining technical idea is to reduce the leakage flux as much as possible.

The way of reducing the magnetic leakage is many, and most of them are to change the shape of the joint surface. Although effective, there is no substantial improvement.

Disclosure of Invention

In order to overcome the defects of the prior art, the rotor with less magnetic leakage under the condition of the same size specification is provided, and the torque-enhanced stepping motor with higher output torque, higher motor efficiency and small volume is provided.

A tooth socket is arranged adjacent to the edge of the rotor and faces the iron core, the magnetic pole direction of a tooth socket convex part is opposite to the magnetic pole direction of the iron core, the magnetic strip is embedded in a tooth socket concave part, and the magnetic pole direction of the outer side of the magnetic strip is the same as the magnetism of the iron core facing the magnetic strip.

And the magnetic strips are magnetized in an N/S parallel mode. To ensure a larger facing area.

The surface of the magnetic strip is plated with a nickel layer. For protecting the magnetic strip.

An adhesive layer is arranged between the magnetic strip and the iron core tooth socket. The adhesive firmly fixes the magnetic strip and the tooth socket of the iron core.

The principle of the invention is as follows: the rotor core of the motor rotor is provided with small teeth, grooves are formed between the teeth, the shapes of the grooves are similar to rectangular shapes, a single-pole magnetic strip is inserted into each groove, the magnetic pole direction of the single-pole magnetic strip is the same as the magnetic pole direction of the rotor core right opposite to the single-pole magnetic strip, and therefore due to the principle that magnetic lines of force are patted and detached, almost all magnetic lines of force are concentrated to flow into the rotor core through tooth tips to form a closed magnetic field, the attraction of the stator and the rotor is greatly increased, and the effect of increasing the motor torque is finally achieved.

The utility model relates to a moment enhancement mode step motor, this motor include stator, rotor, axle, front end housing, rear end housing, front bearing, rear bearing, stator and rotor concentric, there is the clearance between the two, the rotor as aforementioned, rotor core is last to have 25-50 rotor tooth's slots, inlays in every rotor tooth's slot on the rotor and has the monopole rack, the magnetic pole direction of this monopole rack is the same rather than the magnetism just to inserting rotor core. Compared with the prior art, the motor has the advantages that the magnetic flux leakage between the stator and the rotor which cannot act on the teeth can be reduced, the efficiency is improved, the energy is saved, the motor with the same thickness has the torque advantage, and the motor with smaller volume can be selected under the condition of the same output torque, so that the motor has wide installation advantages.

Drawings

FIG. 1 is a schematic diagram of a magnetic circuit of the present invention

FIG. 2 is a schematic view of the structure of the rotor of the present invention

FIG. 3 is a schematic diagram of a magnetic circuit in the background art

FIG. 4 schematic representation of a magnetic stripe of the present invention

FIG. 5 comparative test results in example 3 of the present invention

Wherein, 1 is the stator, 2 is the rotor, 3 is effective moment magnetic line of force, 4 is the magnetic stripe, 5 is the pivot.

Detailed Description

Example 1

As shown in fig. 1, the iron core of the motor rotor 2 has 50 small teeth, 50 grooves are formed between the teeth, the shape of each groove is similar to a rectangle, a single-pole magnetic strip 4 is inserted into each groove, the magnetic pole direction of the single-pole magnetic strip 4 is the same as that of the stator 1 of the rotor opposite to the single-pole magnetic strip 4, in the specific assembly process, as shown in fig. 2, the iron core of the rotor 2 and the magnetic steel stator 1 are assembled according to the requirement of fig. 2, the rotor 2 is fixed on a rotating shaft 5, the central lines of the teeth of the two sections of the iron cores of the rotor 2 are staggered by 3.6 degrees, the magnetic strips are embedded in the grooves between two teeth of the whole circumference of the iron core of the rotor 2 to occupy the space in the grooves as; the N pole of the magnetic strip points to the excircle, and the circumferences are the same; the S pole of the magnetic strip points to the excircle, and the whole circumference is the same; the magnetic strip does not expose the end face of the side face of the rotor core.

Example 2

A stepping motor comprises a stator, a rotor, a shaft, a front end cover, a rear end cover, a front bearing and a rear bearing, wherein the stator and the rotor are concentric, a gap exists between the stator and the rotor, the rotor is as described above, 40 rotor tooth grooves are formed in a rotor iron core, a monopole rack is embedded in each rotor tooth groove on the rotor, and the magnetic pole direction of the monopole rack is the same as the magnetism of the monopole rack facing the inserted rotor iron core.

Example 3

Selecting a 56.4mm square motor, namely a conventional stepping motor, a common motor, the other rotor iron core, namely the magnetic strip, and the other rotor iron core is inserted with the magnetic strip as described above, wherein the rotor is inserted with a magnetic strip structure, and parameters of the magnetic strip are remanence Br (T) 1.08-1.16 and coercive force Hcb (kOe): 10.5 to 11.3, intrinsic coercivity hcj (koe): y10, maximum energy product (BH) (kA/m)³): 231-255, magnetizing in parallel along the direction NS shown in the figure, wherein the surface of the magnetic strip has no defects of cracks, shrinkage holes of sand holes, inclusions, corner falling and the like, the magnetic strip material is samarium cobalt magnetic material, and the surface is processed by nickel plating. In the scheme, the rotor core has 50 small tooth grooves, a magnetic strip is inserted into each tooth groove on the whole circumference, and the dynamic torque comparison test result of the motor is shown in fig. 5. Compared with a common motor, the motor with the magnetic strips inserted in the rotor iron core has the advantage that the dynamic torque performance is improved by about 30%.

Claims

1. A rotor with a magnetic strip inserted into a tooth socket of an iron core is characterized in that the magnetic strip is embedded in a concave part of the tooth socket, and the magnetic pole direction of the outer side of the magnetic rack is the same as the magnetism of the iron core which is just opposite to the magnetic strip.

2. The iron core cogging-in-slot rotor of claim 1, wherein said bars are magnetized in N/S parallel.

3. The iron core cogging-in-slot rotor of claim 1, wherein the surface of said magnetic bar is plated with nickel.

4. The core-cogging-bar rotor of claim 1 wherein an adhesive layer is disposed between said bars and said core-cogging.

5. A stepping motor, the motor is assembled by parts such as the stator, trochanter, axle, front end cap, rear end cap, fore bearing, rear bearing, etc., characterized by that, the said trochanter is any one kind of trochanters described in claim 1-4.