CN115706477A

CN115706477A - Stainless steel switch reluctance motor

Info

Publication number: CN115706477A
Application number: CN202110920334.0A
Authority: CN
Inventors: 赵成; 方立
Original assignee: Hangzhou Siwan Intelligent Equipment Co ltd
Current assignee: Hangzhou Siwan Intelligent Equipment Co ltd
Priority date: 2021-08-11
Filing date: 2021-08-11
Publication date: 2023-02-17

Abstract

The invention provides a stainless steel switch reluctance motor which comprises a stator, a rotor, a rotating shaft and a winding, wherein the winding is arranged on the stator; wherein the stator comprises a stator yoke and a plurality of stator teeth arranged on the stator yoke, and the rotor comprises a rotor yoke and a plurality of rotor teeth arranged on the rotor yoke; an air gap is formed between the stator tooth surface and the rotor tooth surface. The SR motor designed by adopting the magnetic-conductive stainless steel material can prevent rusting and resist corrosion in a humid environment and underwater operation, the electromagnetic air gap of the motor of the SR motor is consistent with the physical air gap, the output power of the motor is high, the copper loss is less, and the output efficiency is improved to a certain extent.

Description

Stainless steel switch reluctance motor

Technical Field

The invention relates to the field of motors, in particular to a switched reluctance motor.

Background

The switched reluctance motor (hereinafter referred to as SR motor) is a component of a switched reluctance motor driving system, is a component for realizing electromechanical energy conversion in the switched reluctance motor driving system, and has the advantages of large starting torque, good low-speed performance, wide speed regulation range, reliable work, and adaptability to various severe, high-temperature and even strong vibration environments compared with an asynchronous motor. As a novel speed regulating system, the SR motor is widely applied to the industrial production fields of vehicle traction, fans, pumps, windlasses and the like.

In actual production, a plurality of scenes exist in which the SR motor needs to work in a humid environment and underwater, but the stator and the rotor of the conventional SR motor are formed by stacking silicon steel sheets, and the silicon steel sheets are easy to rust in the environments, so that the use of the motor is influenced. Therefore, in wet or underwater operation, the motor is required to have excellent corrosion resistance while ensuring proper insulation of its conductive parts from water.

In view of the above, one solution in the prior art is to use a protective element to enclose the active part of the machine from direct contact with the water. One particular approach is to add a metallic rotor can surrounding the rotor and a metallic stator can fixed inside and outside the stator core, which are made of corrosion resistant materials such as hastelloy. As shown in fig. 1, the motor comprises a stator 1, a rotor 2 and a rotating shaft 3, wherein the stator 1 comprises a stator yoke 11, stator teeth 12 and a corrosion-resistant metal stator end cover 13 fixed on the inner side of the stator 1; the rotor 2 comprises a rotor yoke 21, rotor teeth 22 and a corrosion-resistant metallic rotor end cover 23 around the outside of the rotor 2. When the device is used for underwater operation, the corrosion condition of the SR motor can be well slowed down, but the scheme also has obvious problems, and the production cost of the device including materials and processing is increased; secondly, when the protective element for canning is made of conductive metal materials, eddy currents can be induced in the motor when the motor runs, so that the loss of the motor is increased, and the reliability of the whole stator can be reduced; the protection element is easy to lose efficacy due to corrosion over time, so that the service life of the machine is reduced; fourthly, the stator end cover 13 and the rotor end cover 23 are both arranged at the air gap position, so that the thickness of the electromagnetic air gap of the SR motor is the sum of the thickness of the gap between the stator end cover and the rotor end cover and the thickness of the stator end cover and the rotor end cover, thereby increasing the electromagnetic air gap of the SR motor and further reducing the performance of the SR motor.

Disclosure of Invention

In order to meet the requirements of the specific industrial production field, the invention provides the stainless steel switch reluctance motor, the stator and the rotor are prepared from the magnetic-conductive stainless steel material, the problem that the SR motor is easy to rust when in moist or underwater operation is solved, and the motor has excellent performance.

One of the technical schemes provided by the invention is as follows:

a stainless steel switch reluctance motor comprises a stator, a rotor, a rotating shaft and a winding arranged on the stator, wherein the stator and the rotor are both made of magnetic-conductive stainless steel;

wherein the stator comprises a stator yoke and a plurality of stator teeth arranged on the stator yoke, and the rotor comprises a rotor yoke and a plurality of rotor teeth arranged on the rotor yoke; an air gap is formed between the stator tooth surface and the rotor tooth surface.

In other optimized technical schemes, the magnetic stainless steel is the stainless steel with the grade 430.

In other optimized technical schemes, the stator and the rotor are formed by laminating a plurality of magnetic conduction stainless steel sheets.

In other optimized technical schemes, the stator and the rotor are made of solid stainless steel.

In other optimized technical scheme, the thickness of the air gap is not more than 1mm.

In other optimized technical schemes, the thickness of the air gap is 0.25-0.5 mm.

In other optimized technical schemes, the winding structure is a double-layer concentrated winding.

In other optimized technical scheme, the winding is an insulated copper wire.

In other optimized technical schemes, the winding is a polyvinyl chloride insulated copper wire.

In other optimized technical schemes, the winding is a polyester enameled insulated copper wire.

In other preferred embodiments, the stator teeth are distributed uniformly along the circumference of the stator, and/or the rotor teeth are distributed uniformly along the circumference of the rotor.

The invention has the beneficial effects that:

according to the SR motor, the magnetic stainless steel material is adopted to replace the existing silicon steel material and is used as a substitute for the SR motor design, so that the use of a protective cover and shell sealing is completely avoided, the anti-rusting and corrosion-resistant SR motor capable of being used in wet and underwater operation is obtained, the electromagnetic air gap value of the motor is reduced, the output power of the motor is high, the copper loss is low, and the output efficiency is improved to a certain extent.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without any creative effort.

FIG. 1 is a prior art canned switched reluctance motor;

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

fig. 3 is a stainless steel switched reluctance motor of embodiment 1;

FIG. 4 is a graph comparing B-H curves of a switched reluctance motor in prior art and in example 1;

description of reference numerals:

1-stator, 2-rotor, 3-rotation axis, 4-air gap, 11-stator yoke, 12-stator tooth, 13-stator end cover, 21-rotor yoke, 22-rotor tooth, 23-rotor end cover.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

It should be noted that, in the description of the present invention, the descriptions of "first", "second", etc. are used for descriptive purposes only and should not be interpreted as indicating or implying any limitation to the number of technical features. All directional indicators (such as up, down, left, right, front, and back … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the movement, etc. in a specific state (as shown in the drawings), and if the specific state changes, the directional indicator changes accordingly. In the description of the present invention, "a number" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In order to prevent rusting when a production facility needs to be operated underwater, there is a motor structure as shown in fig. 1 in the prior art: the motor comprises a stator 1, a rotor 2 and a rotating shaft 3, wherein the stator 1 comprises a stator yoke 11, stator teeth 12 and a corrosion-resistant metal stator end cover 13 fixed on the inner side of the stator 1; the rotor 2 comprises a rotor yoke 21, rotor teeth 22 and a corrosion-resistant metallic rotor end cover 23 around the outside of the rotor 2. However, the motor with the structure has obvious defects, the cost is increased, the existence of the canning structure can also cause induced eddy currents in the motor, the loss of the motor is increased, the overall reliability of the canned stator is reduced, and the thickness of the canning protection shell is smaller, as shown in figure 1, the stator and the rotor are formed by stacking 35WW270 silicon steel sheets, the protection shell is 430SS stainless steel, wherein the thicknesses of the stator end cover 13 and the rotor end cover 23 are both 0.5mm, when the tank body with the thickness is put into use at the initial stage, the corresponding strength can be ensured, the stator and the rotor made of the silicon steel sheets can be effectively protected, but the strength and the anti-corrosion protection effect of the tank body gradually lose efficacy along with the lapse of time, and the service life of the machine is reduced.

In addition, the circled part A in the attached figure 1 is enlarged, as shown in the attached figure 2: the actual air gap 4 of the motor is 0.35mm, the thicknesses of the stator end cover 13 and the rotor end cover 23 are respectively 0.5mm, at the moment, the electromagnetic air gap thickness of the motor is 1.35mm and is obviously larger than that of an ordinary SR motor, and under the condition of the same current, the larger electromagnetic air gap can cause the generated electromagnetic torque to be smaller, so that the loss of the motor is increased, and the performance of the motor is reduced.

Example 1:

the present embodiment provides a stainless steel switched reluctance motor, as shown in fig. 3: the stator and the rotor are laminated by 430SS stainless steel sheets, and comprise a stator 1, a rotor 2, a rotating shaft 3 and windings (not marked in the figure) arranged on the stator 1.

The 430SS stainless steel used in the embodiment has good corrosion resistance, the prepared motor can be completely placed in water for use, and when the motor is directly immersed in water, the contact area between the laminated stainless steel sheet motor and the water is large, and the heat dissipation capability is further enhanced.

Further, the stator 1 comprises a stator yoke 11 and a plurality of stator teeth 12 arranged on the stator yoke 11, and the rotor 2 comprises a rotor yoke 21 and a plurality of rotor teeth 22 arranged on the rotor yoke 21; an air gap 4 is formed between the surface of the stator tooth 12 and the surface of the rotor tooth 22, and the thickness of the air gap 4 is 0.35mm.

The motor of the stator and the rotor made of stainless steel has low cost, does not need a silicon steel sheet stamping step, saves a canning structure in the prior art, realizes the integration of a motor shell and the motor, and has simpler structure; in addition, considering that the air gap has great influence on the efficiency and the power performance of the switched reluctance motor, the air gap of the motor in the embodiment is smaller, and the electromagnetic air gap is consistent with the physical air gap, so that the output power and the efficiency of the motor are improved.

Further, to avoid early interruption due to the windings coming into contact with water, additional protection of the windings is required. The winding of the motor is a double-layer concentrated winding, and a polyvinyl chloride insulating copper wire insulated with water is adopted as a winding copper wire. In other preferred embodiments, polyester enameled insulated copper wire may also be used.

Further, the stator teeth 12 are evenly distributed along the circumference of the stator 1, and the rotor teeth 22 are evenly distributed along the circumference of the rotor 2.

In other embodiments, similar soft magnetic materials, represented by ferritic stainless steels, can be used as a replacement for motor designs, the commonality of such materials being both corrosion resistance and acceptable magnetic properties. By using the materials, the use of a protective cover and a shell for sealing can be completely avoided, the actual air gap and the electromagnetic air gap are ensured to be equal while the underwater corrosion-resistant SR motor is obtained, and compared with the prior art, the electromagnetic air gap value of the motor is reduced, and the performance of the motor is improved.

The following table shows the magnetic permeability parameters of the prior art using 35WW270 silicon steel sheet material compared with 430SS stainless steel in this example.

Further, as shown in fig. 4, which is a comparison graph of B-H curves of two materials in the prior art and in example 1, as the magnetic field strength H increases, the magnetic field density B of both materials increases, and compared with a silicon steel sheet, the magnetic property of the 430SS stainless steel is lower, but is sufficient to meet the requirements of the SR motor for underwater operation.

Further, performance parameters of two switched reluctance motors are compared, wherein the traditional switched reluctance motor adopts 35WW270 silicon steel sheet materials, the improved motor adopts stainless steel 430SS, and the outer diameter and the axial length of stators of the two motors are kept consistent. Due to the existence of the stator and rotor end covers of the 35WW270 silicon steel sheet material switched reluctance motor, the actual electromagnetic air gap is 1.35mm, and the actual electromagnetic air gap of the 430SS stainless steel switched reluctance motor is 0.35mm.

When the rotating speeds of the two motors are the same and the input power is close to each other, the electromagnetic air gap of the 430SS stainless steel motor is larger, and compared with a 35WW270 silicon steel sheet motor, the output power is higher, the copper loss is less, but the iron loss is larger. The efficiency can reach 73% under the condition that the input power is close, as shown in the following table:

parameter(s)	Silicon steel sheet 35WW270 switch reluctance motor	Stainless steel 430SS switch reluctance motor
			Rotational speed (rpm)	8000	8000
Output power (W)	383	440
			Copper loss (W)	220	80
Iron loss (W)	10	82
			Input power (W)	613	602
Efficiency (%)	62	73

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the specification and drawings of the present invention or other related technical fields directly/indirectly using the technical idea of the present invention shall fall within the scope defined by the claims of the present invention without departing from the spirit of the present invention.

Claims

1. The utility model provides a stainless steel switched reluctance motor, includes stator, rotor, rotation axis, and sets up winding on the stator, its characterized in that:

the stator and the rotor are both made of magnetic-conductive stainless steel;

2. The stainless steel switched reluctance machine of claim 1, wherein:

the magnetic stainless steel is the stainless steel with the trade mark 430.

3. The stainless steel switched reluctance machine of claim 1, wherein:

the stator and/or the rotor are formed by laminating a plurality of magnetic conduction stainless steel sheets.

4. The stainless steel switched reluctance machine of claim 1, wherein:

the stator and/or the rotor are solid stainless steel.

5. A stainless steel switched reluctance machine according to any one of claims 1 to 4, wherein:

the thickness of the air gap is not more than 1mm.

6. The stainless steel switched reluctance machine of claim 5, wherein:

the thickness of the air gap is 0.25-0.5 mm.

7. The stainless steel switched reluctance machine of claim 6, wherein:

the winding is structurally a double-layer concentrated winding.

8. The stainless steel switched reluctance machine of claim 6, wherein:

the winding is an insulated copper wire.

9. A stainless steel switched reluctance machine according to any one of claims 8, wherein:

the winding is any one of a polyvinyl chloride insulated copper wire or a polyester enameled insulated copper wire.

10. The stainless steel switched reluctance machine of claim 6, wherein:

the stator teeth are evenly distributed along the circumference of the stator, and/or the rotor teeth are evenly distributed along the circumference of the rotor.