TWI575844B - Non-oriented electromagnetic steel sheet, manufacturing method therefor, and claw pole motor - Google Patents

Non-oriented electromagnetic steel sheet, manufacturing method therefor, and claw pole motor Download PDF

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Publication number
TWI575844B
TWI575844B TW105109882A TW105109882A TWI575844B TW I575844 B TWI575844 B TW I575844B TW 105109882 A TW105109882 A TW 105109882A TW 105109882 A TW105109882 A TW 105109882A TW I575844 B TWI575844 B TW I575844B
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rolling
magnetic flux
steel sheet
flux density
hot rolling
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TW105109882A
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TW201735499A (en
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川又龍太郎
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新日鐵住金股份有限公司
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Description

Non-directional electromagnetic steel plate, manufacturing method thereof and claw pole motor Field of invention

The present invention relates to a non-oriented electrical steel sheet used as a core material of a claw pole motor, a method of manufacturing the same, and a claw pole type motor using the non-oriented electrical steel sheet.

Background of the invention

The claw-pole motor has attracted attention because of the improved positioning accuracy due to the development of sheet metal technology since the 1970s. In particular, although it has been used as a stepping motor or an alternator for automobiles, the application of generators and alternators for generating regenerative electric power has been expanding recently. In addition, the expansion of the use of the drive motor for EV and HEV is expected.

As the stator core of the claw pole type motor, although the non-oriented electrical steel sheet is punched into a disc-shaped disc shape, and the stator core is bent and formed by the cylindrical drawing to form the stator core at the outer diameter of the core has been It has been used since ancient times, but in recent years, it has been used to make non-oriented electromagnetic steel sheets with plural A strip of claws (claw poles) is punched and the sheet metal is processed into a cylindrical stator core. Since the claw pole type motor can easily produce a motor core by sheet metal working, it has been paid attention to a motor that is used for cost reduction.

However, if a general non-oriented electrical steel sheet is used to punch out a strip-shaped billet and the billet is processed into a stator core, the flow of magnetic flux at the claw pole of the stator core and the outer diameter of the core is not generated. Smooth problem. In other words, since the stator core is used to process a member that has been integrally punched into a strip shape into a cylindrical shape, it is meaningless that the magnetic properties of the material are non-directional in the plane, and only for 90. It is important that the claw poles of the ° and the outer diameter of the core are in the two directions of their respective directions to make the magnetic properties good. However, a biaxial magnetic steel sheet excellent in magnetic properties in the 0° and 90° directions with respect to the rolling direction still requires a difficult procedure to be implemented, and thus has not been put to practical use in the industry.

Further, since the strip-shaped blank sheet metal after punching is processed into a core, the core of the claw-pole motor is obtained by punching under the influence of deterioration of magnetic properties caused by strain caused by sheet metal working. A general motor obtained by laminating steel sheets has a problem that efficiency is deteriorated when a motor having the same output and torque is produced. In order to solve this problem, it is more desirable to develop a non-oriented electrical steel sheet or a hot-rolled steel sheet in which magnetic properties are not sensitive to stress sensitivity in sheet metal processing, compared to conventional non-oriented electrical steel sheets or hot-rolled steel sheets.

Patent Document 1 discloses a case where a biaxial electromagnetic steel sheet is used as a split core. However, the two-directional electromagnetic steel sheet Since cross-rolling must be performed in the manufacturing process, productivity is poor and the cost is high, and it is difficult to meet the strict cost reduction required for the claw-pole motor.

Patent Document 2 discloses a claw pole type motor using a core formed by compressing magnetic powder. However, at this time, since the magnetic powder is used as a core, in the case where a high magnetic field of up to 10000 A/m is applied, a DC magnetization characteristic having a magnetic flux density of 1.7 Tesla or more is required, and compared with a non-oriented electrical steel sheet. This will lower the operating magnetic flux density and reduce the torque of the motor. Further, in order to increase the torque, it is necessary to increase the number of turns of the copper wire, and there is a problem that not only the motor itself becomes large but also the cost of the copper wire increases due to the increase in the amount of copper wire used. Moreover, since the core is divided, the assembly work of the core is laborious and the cost is increased. Therefore, it is difficult to meet the requirements of low cost and miniaturization required for the claw pole type motor.

Patent Document 3 discloses that a claw pole-shaped yoke unit having the same structure as that of the claw pole-shaped yoke unit for excitation is disposed adjacent to the claw pole-shaped yoke unit for excitation, and is disposed on the rotation axis. A stepper motor arranged in the direction of the axis. However, this motor requires a claw pole type yoke unit for the rotation sensor in addition to the claw pole type yoke unit for the excitation, and the copper wire needs to be wound in the unit. Therefore, the motor becomes large and the weight is increased, and the manufacturing cost is increased.

In Patent Document 4, although a stator core and a coil bobbin having a claw pole type structure are disclosed, in order to make the stator core and the bobbin difficult to be displaced, the bobbin is in the bobbin. a stepping motor in which a positioning protrusion is provided to be fitted to a positioning hole of a stator core, However, this is a technique for assembling a general claw-pole motor, and is not a technique for improving the motor characteristics, increasing the efficiency, and miniaturizing.

In Patent Document 5, a single-phase claw-pole type motor in which the side surface of the claw pole is parallel to the axial direction and productivity can be improved is disclosed, but the claw-pole motor is not required to be high in efficiency, high in torque, and small in size. And other technologies. Further, the stator having the claw pole is integrally punched, and there is a problem that the aggregate structure of the non-oriented electrical steel sheet cannot be utilized.

Patent Document 6 discloses a claw-pole type motor in which a core is divided into three, and an iron core having a claw pole that faces downward in the axial direction, a core having a claw pole that faces upward in the axial direction, and The winding wire is formed by dividing the winding core into two cores, and the iron core having the claw pole sandwiches the core of the divided winding wire from above and below. This motor is for the purpose of ensuring the sectional area of the magnetic circuit flowing from the claw to the claw pole, and in order to increase the sectional area, it is premised on the use of a non-scale magnetic material, a sintered material, or a powder material, and no direction is assumed. The situation of the electromagnetic steel plate. Moreover, in order to ensure the magnetic flux of the core and increase the cross-sectional area of the core, if a non-oriented electrical steel sheet is used, there is a problem that the eddy current is increased to greatly reduce the efficiency of the claw-pole motor.

Patent Document 7 discloses a method for producing a cold-rolled non-oriented electrical steel sheet having excellent magnetic properties in two directions intersecting at an angle of 45° with respect to a rolling direction, and the slab reheating temperature is set to 1150. A finishing hot rolling method of not less than ° C and not more than 700 ° C, a finishing hot rolling start temperature of 650 ° C or more and 850 ° C or less, and a hot rolling completion temperature of 550 ° C or more and 800 ° C or less.

However, the finishing hot rolling start temperature disclosed in Patent Document 7 is achieved and At the completion temperature of hot rolling, in addition to the increase in the rolling reaction force applied to the hot rolling rolls of the finishing hot rolling mill, the wear thereof becomes faster, and the life is shortened, and the bearing life of the rolls is also increased due to the rolling. The problem of shortening the reaction force.

Further, in the rough rolling process performed before the finishing hot rolling, if the flattening reheating temperature is lowered, the ability of the rough rolling in the flat embryo produced by the general continuous casting is obtained. The rolling reaction reaction force is still too large, and there is a problem that it is difficult to roll the sheet to a predetermined thickness.

Patent Document 8 discloses a method for producing a hot-rolled non-oriented electrical steel sheet having excellent magnetic properties in two directions intersecting at an angle of 45° with respect to a rolling direction, and a thin cast piece having a thickness of 20 mm or more and 100 mm or less is used. The finishing hot rolling method is performed by setting the finishing hot rolling start temperature to 650 ° C or more and 850 ° C or less, and the hot rolling completion temperature to 550 ° C or more and 800 ° C or less.

However, when the finishing hot rolling start temperature and the hot rolling completion temperature disclosed in Patent Document 8 are realized, in addition to the increase in the rolling reaction force applied to the hot roll of the finishing hot rolling mill, the wear is accelerated, and the life is increased. In addition to the shortening, there is also a problem that the bearing life of the roller is also shortened due to the increased rolling reaction force.

Prior technical literature Patent literature

Patent Document 1: Japanese Patent Laid-Open No. Hei 11-355983

Patent Document 2: Japanese Patent Laid-Open Publication No. 2008-72854

Patent Document 3: Japanese Patent Laid-Open Publication No. 2001-161054

Patent Document 4: Japanese Patent Laid-Open Publication No. 2003-189584

Patent Document 5: Japanese Patent Laid-Open Publication No. 2013-201811

Patent Document 6: Japanese Patent Laid-Open Publication No. 2005-117744

Patent Document 7: Japanese Patent Laid-Open No. 2011-111658

Patent Document 8: Japanese Patent Laid-Open Publication No. 2012-67330

Summary of invention

When considering the flow of the magnetic field in the core of the claw-pole motor, it is possible to obtain an iron core having a good magnetic property by using an electromagnetic steel sheet (bidirectional electromagnetic steel sheet) having excellent magnetic properties in two directions perpendicular to each other. It is a matter of course for those of ordinary skill in the art to which the present invention pertains. However, as described above, in the manufacturing process of the claw pole motor, since the strip-shaped blank sheet metal punched from the electromagnetic steel sheet is processed into a core, the strain generated on the core due to the sheet metal processing is caused. This causes deterioration of magnetic properties. As a result, when a general motor obtained by laminating steel sheets obtained by die cutting is compared under the same output and the same torque, the claw pole type motor produced by using the biaxial electromagnetic steel sheet has maximum efficiency. Lower subject.

In the present specification, the general motor refers to an induction motor that is integrated with a die cutting die, an induction motor that uses a split core on the stator, a synchronous motor that integrally cuts the die, and a synchronous motor that uses a split core on the stator.

In view of the above-mentioned problems, the inventors of the present invention found that when a non-oriented electrical steel sheet having excellent magnetic properties in a direction in which the rolling direction is 45° is used as a material of a stator core of a claw pole motor, the maximum efficiency is This is higher than in the case of a general motor using the same non-oriented electrical steel sheet and having a core outer diameter and claws and applying a winding wire around the claws. In other words, even if the non-oriented electrical steel sheet having the above-described characteristics is used on a motor other than the claw pole type motor, the effect of improving the efficiency as applied to the claw pole type motor is not found.

On the other hand, as disclosed in the above-mentioned Patent Documents 7 and 8, as a method for producing a non-oriented electrical steel sheet having excellent magnetic properties in a direction of 45° with respect to the rolling direction, a technique of performing finish hot rolling at a low temperature has been It is widely known, but there are equipment problems in implementing these technologies on current rough rolling mills and finishing hot rolling mills.

The present invention has been made in view of the above circumstances, and an object of the invention is to provide a stator core of a claw-pole motor which is low in cost and excellent in magnetic properties and which is small in efficiency and small in efficiency. A non-oriented electrical steel sheet of a material, a method for producing the same, and a claw pole type motor produced by the non-oriented electrical steel sheet.

As described above, the inventors of the present invention have found that when a non-oriented electrical steel sheet having excellent magnetic properties in a direction of 45° in the rolling direction is used as a material of a stator core of a claw pole motor, the maximum efficiency is better than that of the production. The use of the same non-oriented electrical steel sheet with a core outer diameter and claws and a general motor applying a winding wire around the claws is higher.

Although the technical reason why such an effect can be obtained is not clear, it is presumed to be as follows. In other words, it is considered to be a non-directional electric power which is excellent in magnetic properties in a direction of 45° with respect to the rolling direction. In the magnetic steel sheet, the aggregate structure or the crystal structure has been improved. Therefore, when the strip-shaped blank sheet punched out from the non-oriented electrical steel sheet is processed to form a core, the residual strain amount introduced into the core is reduced, and as a result, the core of the claw-pole motor is made. The flow of magnetic flux has been greatly improved.

As a method of manufacturing a non-oriented electrical steel sheet having such a feature, a technique of performing finish hot rolling at a low temperature as disclosed in the above-mentioned Patent Documents 7 and 8 (setting a finishing hot rolling temperature condition to a temperature which is generally known) Although lower technology is widely known, there are still equipment problems (short life of hot rolls and bearings) to achieve these technologies in the current rough rolling and finishing hot rolling mills. not easy.

As a result of further research, the inventors of the present invention found that the flattening heating temperature and the rough rolling temperature can be maintained at a normal temperature, and the rolling speed in finishing hot rolling can be set low and precisely. The present invention has been completed by controlling the cooling and solving the problems in the equipment of the prior art and producing a non-oriented electrical steel sheet having magnetic properties equal to or higher than those of the prior art. In the following description, the conventional production method refers to a method for producing a non-oriented electrical steel sheet formed by low-temperature finishing hot rolling disclosed in Patent Documents 7 and 8.

The inventors of the present invention have also found that, according to the manufacturing method of the present invention, it is possible to obtain a range in which the magnetic flux density centering on the direction of 45° with respect to the rolling direction is higher than the conventional method. A non-oriented electrical steel sheet having a wide angular distribution and a high absolute value and excellent magnetic properties.

By reducing the rolling speed of finishing hot rolling, compared to the previous method, Although the technical reason for producing a non-oriented electrical steel sheet having excellent magnetic properties is not clear, it is presumed to be as follows. That is, the sheet bar conveyed from the rough rolling mill to the finishing hot rolling mill receives heat by finishing the hot rolling rolls of the hot rolling mill, and is rolled at a temperature far higher than the cold rolling. Delay, but by reducing the rolling speed, the processing heat itself can be suppressed. As a result, it is considered that there is a possibility that a non-oriented electrical steel sheet having an aggregate structure or a crystal structure different from the non-oriented electrical steel sheet produced by the conventional production method can be obtained.

Moreover, the inventors of the present invention have also found that the effect of the magnetic properties in the 45° direction obtained by the production method of the present invention is excellent in the case of the rolling speed of the conventional production method. Although this technical reason is not clear, it is presumed that the reason for the increase in the rolling speed is that the recrystallization is performed in the finishing rolling because the strain rate is increased, so that the aggregate structure excellent in magnetic properties cannot be formed. Or crystalline tissue.

The gist of the present invention based on the above findings is as follows.

(1) A non-oriented electrical steel sheet according to an aspect of the present invention is a non-oriented electrical steel sheet for a stator core of a claw pole motor, which is a magnetic flux density in a direction of 45° with respect to a rolling direction, A strip-shaped steel sheet having a magnetic flux density in the rolling direction and a magnetic flux density in the sheet width direction in a direction of 90° with respect to the rolling direction.

(2) In the non-oriented electrical steel sheet according to the above (1), the direction inclined by an angle of 45° counterclockwise with respect to the rolling direction in the rolling direction may be referred to as a first direction, and may be 135. The angle of the angle of inclination is set to In the second direction, a direction inclined at an angle of 45° clockwise about the normal to the plate surface with respect to the rolling direction is referred to as a third direction, and a direction inclined at an angle of 135° is referred to as a fourth direction, and The average value of the magnetic flux density in the first direction, the magnetic flux density in the second direction, the magnetic flux density in the third direction, and the magnetic flux density in the fourth direction in the magnetization force 5000 A/m is set in units of T B50 (45-ave.), and the average value of the magnetic flux density in the rolling direction and the magnetic flux density in the sheet width direction in the magnetizing force 5000 A/m is set to B50 (L+C) in units of T The following formula (1) will hold.

B50(L+C)+0.020<B50(45-ave.)......(1)

(3) The non-oriented electrical steel sheet according to the above (2), wherein the angle with respect to the rolling direction is included in a direction of a range of 0° to 90° counterclockwise around the normal to the plate surface. The magnetic flux density in the first direction is the highest, and the magnetic flux in the second direction is included in a direction in a range of 90° to 180° counterclockwise around the normal to the plate surface in an angle with respect to the rolling direction. The density is the highest, and the angle with respect to the rolling direction is included in a direction clockwise around the normal of the plate surface in the range of 0° to 90°, and the magnetic flux density in the third direction is the highest, and the rolling is performed with respect to the foregoing The angle of the direction is included in a direction clockwise around the normal of the plate surface by 90° to 180°, and the magnetic flux density in the fourth direction is the highest.

In this case, when the magnetic flux density in the first direction is B45max, the magnetic flux in the direction of ±10° around the normal to the plate surface at the angle with respect to the first direction is satisfied. The density is 0.99×B45max or more, and each of the second direction, the third direction, and the fourth direction satisfies the same condition.

(4) A method for producing a non-oriented electrical steel sheet according to an aspect of the present invention comprises: a hot rolling step of forming a sheet obtained by rough rolling a flat blank at a finishing hot rolling starting temperature of 800 ° C or higher Hot rolling at 1150 ° C or less, hot rolling completion temperature of less than 750 ° C, and rolling speed of the final station output side of the finishing hot rolling mill of 300 m / min or less; and cold rolling step, from the foregoing The hot-rolled steel sheet obtained by the hot rolling step was subjected to cold rolling at a rolling reduction ratio of more than 87%.

(5) A method for producing a non-oriented electrical steel sheet according to another aspect of the present invention includes a hot rolling step, wherein a sheet obtained by rough rolling a flat blank is subjected to a finishing hot rolling starting temperature of 800 ° C or higher. Hot rolling is carried out under conditions of 1150 ° C or less, a hot rolling completion temperature of 800 ° C or less, a finishing hot rolling reduction of 94% or more, and a rolling speed of the final station output side of the hot rolling mill of 300 m / min or less. Delay.

(6) A claw-pole type motor in which the non-oriented electrical steel sheet according to any one of the above (1) to (3) is used as a stator core, which is The motor of the stator core is formed by punching into a strip-shaped billet having an angle of 45 degrees with respect to the rolling direction of the non-oriented electrical steel sheet.

According to the above aspect of the present invention, it is possible to obtain a problem of the equipment of the prior art, and it is suitable for producing a non-oriented electrical steel sheet having a low-cost, high-efficiency, high-efficiency, small claw-pole motor. A manufacturing method and a claw pole type motor produced from the non-oriented electrical steel sheet.

1‧‧‧ non-directional electrical steel sheet

2‧‧‧Banded billets

11‧‧‧ core outer diameter

12‧‧‧ claw pole

21‧‧‧ coil

22‧‧‧ permanent magnet type rotor

23‧‧‧Outer board

31‧‧‧ Stator

32‧‧‧ claw pole motor

L‧‧‧Rolling direction

C‧‧‧ plate width direction

D1‧‧‧1st direction (direction 45° with respect to the rolling direction)

D2‧‧‧2nd direction (direction 45° with respect to the rolling direction)

D3‧‧‧3rd direction (direction 45° with respect to the rolling direction)

D4‧‧‧4th direction (relative to the rolling section) In the direction of 45°)

P‧‧‧board normal

Fig. 1 is a plan view showing a non-oriented electrical steel sheet according to an embodiment of the present invention.

2 is a plan view showing a punching example of a strip-shaped billet in which a stator core of a claw-pole motor is formed from the non-oriented electrical steel sheet of the embodiment.

Fig. 3 is a plan view showing an example of a strip-shaped billet forming the stator core of the claw pole type motor of the embodiment.

Fig. 4 is a perspective view showing a state in which the strip-shaped billet of Fig. 3 is processed into a cylindrical shape.

Fig. 5 is a perspective view showing the state of processing continued from Fig. 4.

Fig. 6A is an explanatory view showing a process of inserting a coil in a process of inserting a coil into a stator core to manufacture a stator.

6B is an explanatory view showing a process of bending a lower side of a coil of a stator core in a process of inserting a coil into a stator core to manufacture a stator.

Fig. 6C is a completed view of the stator fabricated in accordance with the process shown in Figs. 6A and 6B.

Fig. 7 is a perspective view showing the processing state continued from Fig. 6C.

Figure 8 is a perspective view showing the appearance of a completed claw pole motor.

Fig. 9 is a perspective view showing the appearance of a claw pole type motor equipped with an outer panel.

10 is a graph in which the ratio of the magnetic flux density in each angular direction to the magnetic flux density (maximum magnetic flux density) in the direction of 45° is plotted on the vertical axis with respect to the angle in the rolling direction.

Form for implementing the invention

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the specification and the drawings, elements that have substantially the same functional configurations are denoted by the same reference numerals, and the description thereof will not be repeated.

Fig. 1 is a plan view showing a non-oriented electrical steel sheet 1 according to an embodiment of the present invention. As shown in Fig. 1, in the present embodiment, the steel sheet for the stator core of the claw pole type motor has a magnetic flux density in a direction of 45° with respect to the rolling direction L in the sheet surface, and is more than the rolling direction. The magnetic flux density of L and the strip-shaped non-oriented electrical steel sheet 1 having a larger magnetic flux density in the plate width direction C in the direction in which the rolling direction L is 90°.

As shown in Fig. 1, in the present embodiment, a direction inclined by an angle of 45° with respect to the rolling direction L counterclockwise around the plate surface normal P (an axis perpendicular to the plate surface) is referred to as a first direction D1. And the direction inclined by the angle of 135 degrees is set as the 2nd direction D2. Further, a direction inclined at an angle of P45° clockwise about the plate surface normal to the rolling direction L is referred to as a third direction D3, and a direction inclined at an angle of 135° is referred to as a fourth direction D4. In the following, the counterclockwise direction of the normal P of the plate surface may be set to the positive direction, the clockwise direction of the normal P of the plate surface may be set to the negative direction, and the positive and negative symbols may be attached to the angle (refer to the figure). 1).

Each of the first direction D1, the second direction D2, the third direction D3, and the fourth direction D4 described above is a direction that is 45° with respect to the rolling direction L in the plate surface. In the non-oriented electrical steel sheet 1 of the present embodiment, the magnetic flux density in the first direction D1, the second direction D2, the third direction D3, and the fourth direction D4 is higher than the magnetic flux density and the plate width direction in the rolling direction L. C has a higher magnetic flux density.

The magnetic flux density in the first direction D1, the magnetic flux density in the second direction D2, the magnetic flux density in the third direction D3, and the fourth square in the magnetization force 5000 A/m The average value of the magnetic flux density to D4 is set to B50 (45-ave.) in units of T (Tesla). Moreover, the average value of the magnetic flux density in the rolling direction L and the magnetic flux density in the sheet width direction C in the magnetization force 5000 A/m is set to B50 (L+C) in units of T (Tesla). In this case, it is preferable that the following formula (1) is satisfied in the non-oriented electrical steel sheet 1 of the present embodiment.

B50(L+C)+0.020<B50(45-ave.)...(1)

When the magnetic flux density in each direction of the magnetization force of 5000 A/m is measured by an Epstein apparatus, the Epstein measurement value is used as a measurement value of the magnetic flux density. Further, when the magnetic flux density in each direction of the magnetization force of 5000 A/m was measured by SST (magnetic tester), the sample cut in each direction was used, and the same number of average values were measured.

Preferably, in the non-oriented electrical steel sheet 1 of the present embodiment, the angle with respect to the rolling direction L is included in the direction of the counterclockwise normal plane of the plate surface P0° to 90° (that is, here). Among the directions including the rolling direction L and the plate width direction C), the magnetic flux density in the first direction D1 is the highest. Here, it is preferable to satisfy the following condition: when the magnetic flux density in the first direction D1 is B45max, the angle with respect to the first direction D1 is included in the direction of the range of P±10° around the normal of the plate surface. The pass density is 0.99×B45max or more.

That is, the magnetic flux density in the first direction D1 is prominently higher than the angle in the range of 0° to +90° with respect to the angle L in the rolling direction L, and it is preferable that it is The angular range in which the angle (+45°) of the first direction D1 having the largest magnetic flux density is the center has a constant amplitude of the magnetic flux density (see FIG. 10 described later). More preferably, the angle in the direction relative to the first direction D1 is included in the direction of the range of P ± 15° around the normal of the plate surface. The pass density is 0.99×B45max or more.

Similarly, it is preferable that the angle with respect to the rolling direction L is included in the direction of the counterclockwise normal direction of the plate surface P 90° to 180° (that is, the rolling direction L is also included in the direction). Among the plate width directions C), the magnetic flux density in the second direction D2 is the highest. Preferably, the second direction D2 also satisfies the same condition as the condition of the first direction D1.

In other words, it is preferable that when the magnetic flux density in the second direction D2 is B135max, the angle with respect to the second direction D2 is included in the direction of the range of P±10° around the normal to the plate surface. The magnetic flux density is 0.99 × B135max or more. More preferably, the magnetic flux density in the direction of the range of P±15° around the normal to the plate surface in the angle with respect to the second direction D2 is 0.99×B135max or more.

Similarly, it is preferable that the angle with respect to the rolling direction L is included in a direction of a clockwise direction of the normal plane of the plate surface P 0° to 90° (that is, the rolling direction L is also included in the direction). Among the plate width directions C), the magnetic flux density in the third direction D3 is the highest. Preferably, the third direction D3 also satisfies the same condition as the condition of the first direction D1.

In other words, it is preferable to satisfy the following condition: when the magnetic flux density in the third direction D3 is B45max', the angle with respect to the third direction D3 is included in the range of P±10° around the normal to the plate surface. The magnetic flux density is 0.99 × B45max' or more. More preferably, the magnetic flux density in the direction of the range of P±15° around the normal to the plate surface is 0.99×B45max' or more in the angle with respect to the third direction D3.

Similarly, it is desirable to have an angle relative to the rolling direction L The magnetic flux density in the fourth direction D4 is included in the direction of the clockwise normal plane of the plate surface P 90° to 180° (that is, the rolling direction L and the plate width direction C are also included in this direction). highest. Preferably, the fourth direction D4 also satisfies the same condition as the condition of the first direction D1.

In other words, it is preferable to satisfy the following condition: when the magnetic flux density in the fourth direction D4 is B135max', the angle with respect to the fourth direction D4 is included in the range of P±10° around the normal to the plate surface. The magnetic flux density is 0.99×B135max' or more. More preferably, the magnetic flux density in the direction of the range of P±15° around the normal to the plate surface is 0.99×B135max' or more in the angle with respect to the fourth direction D4.

Magnetic flux having a magnetic flux density in a direction of 45° with respect to the rolling direction L (the first direction D1, the second direction D2, the third direction D3, and the fourth direction D4) than the rolling direction L and the plate width direction C The non-oriented electrical steel sheet 1 having a higher density is produced by controlling hot rolling and cold rolling as will be described later. In the manufacturing steps of the non-oriented electrical steel sheet 1, the control of the hot rolling conditions is critical, and there is no particular limitation on the control of the annealing step. By using such a non-oriented electrical steel sheet 1 as a stator core of a claw pole type motor, the characteristics of the non-oriented electrical steel sheet 1 can be sufficiently utilized, and the efficiency of the claw pole type motor can be greatly improved.

The non-oriented electrical steel sheet 1 having the above-described characteristics can greatly improve the efficiency of the claw pole type motor, but the magnetic properties of the conventional two-oriented electrical steel sheet in the rolling direction and the sheet width direction are excellent. In the case of a non-oriented electrical steel sheet and a hot-rolled steel sheet having excellent characteristics, this effect is not produced, and the reason for this is presumed as follows.

It is considered that this is because the non-oriented electrical steel sheet 1 having the above characteristics may have a residual strain amount introduced into the steel sheet during sheet metal processing due to some improvement of the aggregate structure or improvement of the crystal structure, and thus As a result, the flow of the magnetic flux in the core of the formed claw pole motor is greatly improved. According to the review by the inventors of the present invention, it was confirmed that the effect was remarkable on the claw pole type motor in which the bending radius R of the core was 10 mm or less, or the claw pole type motor core which was bent into almost right angles. of.

When the non-oriented electrical steel sheet 1 having the above characteristics is produced by cold rolling, the sheet obtained by roughly rolling the flat blank is subjected to a hot rolling step so that the hot rolling completion temperature becomes less than 750. In the cold rolling step, the hot rolled steel sheet obtained from the hot rolling step is subjected to cold rolling and rolled at a rolling reduction ratio of more than 87%. From the viewpoint of improving the magnetic properties in the direction of 45° with respect to the rolling direction L, it is preferable to set the finishing hot rolling starting temperature in the hot rolling step to 800 ° C or more and 1150 ° C or less. It is desirable to be 900 ° C or more and 1050 ° C or less. The lower limit of the hot rolling completion temperature is not set, but from the viewpoint of the rolling property, it is preferably 500 ° C or more. From the viewpoint of the improvement of the magnetic properties in the direction of 45° with respect to the rolling direction L, it is desirable to make the rolling speed in the hot rolling step at the output side of the finishing hot rolling mill at a speed of 300 m/ In the following, it is more preferably 200 m/min or less, and from the viewpoint of productivity, it is preferably 20 m/min or more.

Moreover, when the non-oriented electrical steel sheet 1 having the above-described characteristics is produced by hot rolling, the flattening of the flat embryo is performed in the hot rolling step. The obtained sheet is hot rolled at a hot rolling completion temperature of 800 ° C or lower, 650 ° C or higher, and a finishing hot rolling reduction ratio of 94% or more, and is subjected to low temperature finishing to suppress hot rolling. Recrystallization of the steel sheet. The upper limit of the finishing hot rolling reduction ratio is not particularly set, but from the viewpoint of productivity, it is preferably 98.5% or less. Thereby, an aggregate structure excellent in magnetic properties in a direction of 45° with respect to the rolling direction is formed. From the viewpoint of improving the magnetic properties in the direction of 45° with respect to the rolling direction L, it is preferable to set the finishing hot rolling starting temperature to 800 ° C or more and 1150 ° C or less, and more preferably 900 ° C or more and 1050. Below °C. If the hot rolling completion temperature is too low, the magnetic properties are lowered due to residual stress, so the lower limit is preferably set to 650 °C. Further, if the hot rolling completion temperature is too high, recrystallization is caused on the hot-rolled steel sheet after finishing the final station of the hot rolling mill, and the desired aggregate structure cannot be obtained. Therefore, the upper limit is set to 800 °C. From the viewpoint of improving the magnetic properties in the direction of 45° with respect to the rolling direction L, it is preferable that the rolling speed is 300 m/min or less on the output side of the final station of the finishing hot rolling apparatus, which is more preferable. It is 200 m/min or less, and from the viewpoint of productivity, it is preferably 20 m/min or more.

Further, it is also possible to carry out the lubrication hot rolling in which the fat emulsion of 0.5 to 20% by volume is mixed in the cooling water of the hot roll.

As described above, in the method for producing the non-oriented electrical steel sheet 1 of the present embodiment, after the slab is heated, the rough rolling until the formation of the slab is performed, and the hot rolling is performed at a low speed, and the tempering is performed at a low temperature. finishing. The rough rolling at low temperature is difficult to carry out with the current rough rolling extension because of the large thickness of the rolled material, and therefore it is preferably used in the prior art. The rough hot rolling is performed in the temperature range of 800 ° C or more and 1250 ° C or less. More preferably, the rough rolling is performed in a temperature range of 850 ° C or more and 1050 ° C or less.

In the finishing hot rolling, in order to lower the hot rolling completion temperature, the finishing hot rolling start temperature is lowered, or the finishing hot rolling start temperature is the same as in the prior art, and various types are used in the finishing hot rolling. Means to control the cooling of the two methods.

Here, when the finishing hot rolling start temperature is lowered, it is necessary to uniformly reduce the sheet which has been subjected to the rough rolling to a predetermined temperature, and as a method thereof, a thin cast piece is used and the rough rolling is delayed. The method of coiling to a tunnel furnace or a coil box furnace for soaking heat preservation. According to this method, although the hot rolling start temperature can be precisely controlled to lower the hot rolling completion temperature, there is a problem in how to cool the sheet which has been subjected to the rough rolling in a short time. This cooling usually reaches 200 ° C or more, so cooling of the sheet having a thickness must be achieved in a short time.

In the method for producing the non-oriented electrical steel sheet 1 of the present embodiment, in order to start the hot rolling at a low temperature, the sheet may be cooled by light brine or contacted by a dedicated cooling roll to transfer heat transfer or These combinations may be cooled to a predetermined temperature to start finishing hot rolling.

Further, in order to further improve the magnetic characteristics in the direction of 45° with respect to the rolling direction L, it is more preferable to perform cooling in finishing hot rolling by low-speed rolling without particularly cooling the sheet. of. Thereby, an angle (+45°) in the first direction D1, an angle (+135°) in the second direction D2, an angle (−45°) in the third direction D3, and an angle in the fourth direction D4 can be obtained. Centered at (-135°), it is included in the normal of the plate surface P ± 10 ° (more excellent magnetic The magnetic flux density in the direction of the range of ±15°) is a non-oriented electrical steel sheet 1 having excellent magnetic properties such as a value of 0.99 times or more of the maximum magnetic flux density in the central angular direction.

In order to realize such magnetic characteristics, as described above, it is preferable that the rolling speed is 300 m/min or less on the output side of the finishing station of the finishing hot rolling mill, more desirably 200 m/min or less, and from the productive From the point of view, it is more desirable to be 20 m/min or more. Therefore, it is desirable to uniform the temperature between the control stations on the finishing hot rolling mill and to uniformize the temperature distribution in the sheet width direction C. Further, since the finishing rolling speed is low, it is desirable to perform controlled hot rolling in which the temperature distribution in the longitudinal direction of the coil from the front end portion to the rear end portion of the finished hot rolled coil is kept uniform.

As a method of realizing this technique, a rod heater is disposed behind the rough rolling mill, in front of the finishing hot rolling mill, or between the stations of the finishing hot rolling mill, and the coil width direction and the length direction are required as needed. Temperature compensation. Further, in the cooling of the finish hot rolling, in order to perform the temperature compensation of the end portion of the hot rolled sheet which is easy to lower in the low-speed hot rolling, it is necessary to achieve the width direction in the sheet width direction by a different cooling method. Different cooling rates. Since the contact time of the roll with the rolled material is long due to low-speed finishing hot rolling, the roll of the finishing hot rolling mill is appropriately cooled as needed to perform cooling by contact with the roll. It is difficult to set the temperature deviation in the width direction of the roll from the viewpoint of the life thereof. Therefore, it is preferable to perform cooling compensation in the width direction of the plate between the stations, and to perform cooling control of the roll heat dissipation in the longitudinal direction of the steel sheet.

The components of the non-oriented electrical steel sheet 1 of the present embodiment are As long as it is a normal non-oriented electrical steel sheet, there is no particular limitation. However, from the viewpoint of securing the general magnetic characteristics of the non-oriented electrical steel sheet 1, an example of a preferable component is as follows. However, it is not intended to limitly define the component system of the non-oriented electrical steel sheet having the aggregate structure intended by the present invention by these components.

The component of the non-oriented electrical steel sheet 1 of the present embodiment is formed by the following components in terms of % by mass: 0.1 ≦Si ≦ 6.5 0.1 ≦ Mn ≦ 1.5, and Al addition is not essential, but if it is added, it is set to 0.1≦Al≦2.5, C≦0.003 N≦0.003 S≦0.003 The remainder is composed of Fe and unavoidable impurities.

When Si, Mn, and Al added to the non-oriented electrical steel sheet 1 are less than 0.1%, the increase in electrical resistivity at this time may be insufficient, and a desired low iron loss may not be obtained. Add 0.1% or more. When the Si addition amount exceeds 6.5%, the hot rolling ductility and the cold rolling ductility are lowered, so it is preferably 6.5% or less. When the amount of addition of Mn exceeds 1.5%, the effect of improving the aggregate structure via the additive effect is saturated, which is not economical, and therefore it is preferably 1.5% or less. The addition of Al is not essential. When the amount of addition of Al exceeds 2.5%, the hysteresis loss is increased and the iron loss improvement effect in the non-oriented electrical steel sheet 1 having a high electrical resistivity is saturated. Therefore, it is preferable to The amount of addition is controlled below 2.5%.

When the C content exceeds 0.003%, there is a problem that the value of iron loss increases due to magnetic aging in the use of the non-oriented electrical steel sheet 1. Therefore, the C content is preferably 0.003% or less. When the N content exceeds 0.003%, various fine nitrides are formed in the steel to prevent crystal grain growth of the non-oriented electrical steel sheet 1 or to impede the movement of the magnetic wall, and any of them causes an increase in iron loss. It is desirable that the N content is 0.003% or less. When the S content is more than 0.003%, the sulfide is melted in the heating of the flat embryo, and is finely precipitated during the hot rolling at the time of finishing hot rolling, and the crystal grain growth of the non-oriented electrical steel sheet 1 is hindered or becomes a magnetic wall. The obstacle to movement, whichever is the cause of the increase in iron loss, is preferably such that the S content is 0.003% or less.

Fig. 2 is a plan view showing a punching example of a strip-shaped billet forming a stator core of a claw pole motor from a steel sheet. As described above, the steel sheet 1 is a non-oriented electrical steel sheet having a magnetic flux density in a direction of 45° with respect to the rolling direction L being larger than a magnetic flux density in the rolling direction L and a magnetic flux density in the sheet width direction C. The strip-shaped blank 2 is punched at an angle of 45° with respect to the rolling direction L of the steel sheet 1. The strip-shaped billet 2 has a plurality of claws each having, for example, 12 or 24 poles in the vertical direction with respect to the longitudinal direction of the core outer diameter portion 11 on both sides in the width direction of the strip-shaped core outer diameter portion 11. Extreme 12. In this way, the strip-shaped billet 2 is punched at an angle of 45° by a non-oriented electrical steel sheet having excellent magnetic properties in a direction of 45° with respect to the rolling direction L, and the strip-shaped billet 2 becomes Both the longitudinal direction of the core outer diameter portion 11 and the direction of the claw pole 12 have excellent magnetic properties. In the present embodiment, the strip-shaped blank 2 is integrally processed to form a stator core of a claw-pole motor.

3 to 9 are views showing a process of producing a claw pole type motor from the strip-shaped blank 2 punched out as shown in Fig. 2 . The outline of the manufacturing process of the claw pole motor will be described below.

As shown in Fig. 2, the strip-shaped blank 2 punched out from the steel sheet 1 at an angle of 45° is in the direction indicated by the arrow in Fig. 3, that is, the longitudinal direction of the outer diameter portion 11 of the core and the direction of the claw pole 12 Excellent magnetic properties. The strip-shaped blank 2 is formed into a cylindrical shape as shown in FIG. 4 by sheet metal processing, and further, as shown in FIG. 5, the width direction of the core outer diameter portion 11 is one side, which is shown in FIG. The claw pole 12 on the upper side is folded inward, and the coil 21 is inserted from below. As shown in FIG. 6A, the coil 21 is inserted into a space formed between the core outer diameter portion 11 and the claw pole 12 by bending the claw pole 12 from the core outer diameter portion 11 into a substantially right angle, and then, as shown in FIG. 6B. As shown in Fig. 6C, the claw poles 12 on the opposite sides (the lower side in Figs. 6B and 6C) are also folded inside the core outer diameter portion 11. As shown in Fig. 6C, the opposing claw poles 12 are formed such that the respective poles are at alternate positions.

In addition, in order to improve workability or other purposes, each of the operations may be performed in a state in which the members are turned upside down in the steps of FIGS. 6A, 6B, and 6C.

By completing the stator 31 of the claw pole motor and inserting, for example, the permanent magnet type rotor 22 as shown in FIG. 7 to complete the stator type claw pole motor 32 as shown in FIG. . Further, for example, the upper outer plate 23 may be attached as shown in FIG. 9 and used as the claw pole motor 32.

As described above, the claw pole motor 32 which is formed by integrally processing the strip-shaped blank 2 by the sheet metal processing to form the stator core is used as a material for making the direction of the core outer diameter portion 11 of the stator 31 a material. a certain direction of 1 In addition, the core outer diameter portion 11 and the claw pole 12 are directions in which the magnetic properties of the steel sheet 1 are excellent in the direction of the rolling direction L by 45°. By using the article integrally formed from the strip-shaped billet 2 as the stator core of the claw pole type motor, the efficiency of the claw pole type motor is greatly improved.

Further, since the non-oriented electrical steel sheet 1 of the present embodiment can be manufactured by a simple method as compared with the biaxial electromagnetic steel sheet, the cost can be significantly reduced as compared with the case of using the two-direction electromagnetic steel sheet. Moreover, since the core can be punched by integral punching, the manufacturing cost of the core can also be reduced. Further, since the high magnetic flux density can be obtained with a low magnetic field, the amount of the copper wire required as the exciting coil can be reduced, and the core is not required to be divided, so that the manufacturing cost can also be reduced. In other words, the claw-pole motor can be reduced in size, high in torque, and high in efficiency at low cost.

The preferred embodiments of the present invention have been described above, but the present invention is not limited by the examples. Obviously, as long as it is a person having ordinary knowledge in the technical field to which the present invention pertains, various modifications and modifications can be conceived within the scope of the technical idea described in the scope of the patent application, and it should be understood that Etc. also falls within the technical scope of the present invention.

Example

(Example 1)

The steels 1 to 3 of the components shown in Table 1 were melted and continuously cast to form a 200 mm thick flat embryo, which was heated to 1,100 ° C and formed into a 40 mm thick plate by rough rolling. For this sheet, the finishing hot rolling start temperature F0T is variously set as shown in Table 2, and is finished by rolling and rolling. 2.0mm hot rolled steel sheet. In order to control the temperature of the rough rolled sheet, the sheet was cooled by a light brine cooling and a dedicated cooling roll, and a rod heater was used to compensate for the temperature. Further, the rolling speed of the final station output side of the finishing hot rolling mill is set to be 100 m/min or more to 250 m/min to control the hot rolling completion temperature. In order to make the hot rolling completion temperature uniform, the rod heaters disposed between the stations are used in combination with the cooling between the stations. Further, this was pickled, and the cold rolling ratio was variously set to carry out cold rolling and rolling, and finishing annealing was performed. The finishing annealing conditions were set such that steel 1 was 750 ° C for 30 seconds, steel 2 was 950 ° C for 20 seconds, and steel 3 was 1050 ° C for 20 seconds. Thereafter, B50 (45-ave.) and B50 (L+C) of the respective steel sheets were measured. Further, in the FOT and the cold rolling ratio, a value other than the range of the present invention when the non-oriented electrical steel sheet is produced by cold rolling is attached with a bottom line.

At the same time, a claw-pole motor and a general motor that performs a winding wire on the claws of the stator were fabricated using each steel plate, and the maximum efficiency was investigated. The sheet metal bending process at the time of the claw pole type motor is formed at a right angle as shown in Fig. 6(a). The results are shown in Table 2.

【Table 2】

It can be seen from Table 2 that when the finishing hot rolling start temperature F0T is lower than 750 ° C and the cold rolling ratio exceeds 87%, the value of 50 (45-ave.) - B50 (L + C) is 0.04 T or more, and relative The magnetic flux density in the direction in which the rolling direction is 45° is excellent. Further, it is understood that when a claw-pole type motor is produced by the non-oriented electrical steel sheet of this manufacturing method, an excellent maximum efficiency of 94.0% or more can be obtained. and Moreover, in the case of a general motor, the maximum efficiency as a claw pole type motor cannot be obtained.

(Example 2)

The steel of the composition shown in Table 3 was melted and continuously cast to form a 200 mm thick slab, which was heated to 1,100 ° C and formed into a 20 mm thick slab by rough rolling. For this sheet, the hot rolling completion temperature FT and the rolling reduction ratio were variously set as shown in Table 4, and finishing rolling was performed. At this time, the finishing hot rolling start temperature is set to 950 ° C, and in order to adjust the hot rolling completion temperature, the rolling speed of the final station output side of the finishing hot rolling mill is set to 150 m / min to 300 m / min. In order to make the temperature distribution of the finished hot-rolled sheet uniform in the width direction and the length direction, the temperature can be controlled by a rod heater provided between the finishing hot rolling mill and the finishing hot rolling mill. Further, controlled cooling in the width direction and the longitudinal direction is performed between the finishing hot rolling stations. In order to finish the hot rolling temperature control, not only the cooling water is directly sprayed on the steel sheet, but also the cooling of the rolling rolls is controlled to control the hot rolling completion temperature by the heat dissipation control of the rolls. Using this hot rolled steel sheet, B50 (L+C) and B50 (45-ave.) were measured. Further, in the FT and the rolling reduction ratio, a value other than the range of the present invention when the non-oriented electrical steel sheet is produced by hot rolling is attached with a bottom line.

At the same time, a claw-pole motor and a general motor that performs a winding wire on the claws of the stator were fabricated using each steel plate, and the maximum efficiency was investigated. The radius R of the sheet metal bending process in the production of the claw pole motor is set to 3 mm. The results are shown in Table 4.

As is clear from Table 4, when the FT is at 800 ° C or lower and the sheet rolling reduction ratio is 94% or more, the magnetic flux density in the direction of 45° with respect to the rolling direction is excellent. this In addition, it can be understood that when a claw-pole type motor is produced using the non-oriented electrical steel sheet of this manufacturing method, an excellent maximum efficiency of 95.0% or more can be obtained. Moreover, in the case of a general motor, the maximum efficiency as a claw pole type motor cannot be obtained.

(Example 3)

The steel of the composition shown in Table 5 was melted and continuously cast to form a 200 mm thick flat embryo, which was heated to 1,100 ° C and formed into a 20 mm thick sheet by rough rolling. With respect to this sheet, the hot rolling reduction ratio was set to 96%, and the hot rolling completion temperature was set to three grades as shown in Table 6, and finishing rolling was performed. At this time, the finishing hot rolling start temperature is set to 900 ° C, and the rolling speed of the final station output side of the finishing hot rolling mill is set to 100 m / min to 200 m / min to adjust the hot rolling completion temperature. At this time, the finishing hot rolling start temperature is set to 950 ° C, and in order to adjust the hot rolling completion temperature, the rolling speed of the final station output side of the finishing hot rolling mill is set to 150 m / min to 300 m / min. In order to set the temperature distribution of the finished hot-rolled sheet to be uniform in the sheet width direction and the longitudinal direction, the temperature can be controlled by a rod heater or an edge heater provided between the finishing hot rolling mills. Further, controlled cooling in the width direction and the longitudinal direction is performed between the finishing hot rolling stations. In order to finish the hot rolling temperature control, not only the cooling water is directly sprayed on the steel sheet, but also the cooling of the rolling rolls is controlled to control the hot rolling completion temperature by the heat dissipation control of the rolls. A claw pole type motor was produced using the obtained hot rolled steel sheet. The radius R of the sheet metal bending process when the claw pole motor is manufactured is set to 7 mm.

The maximum efficiency of the produced claw-pole motor was compared with 1.00 at a hot rolling completion temperature of 675 °C. The results are shown in Table 6.

As can be seen from Table 6, the maximum efficiency of the claw pole type motor using the hot rolled steel sheet having a hot rolling completion temperature of 625 ° C is inferior to that of the hot rolling completion temperature of 675 ° C. This reason is considered to be caused by an increase in the residual strain amount in the hot-rolled steel sheet used for the claw-pole motor because the hot rolling completion temperature is too low. Further, in the maximum efficiency of the claw pole type motor, the motor using the hot rolled steel sheet having a hot rolling completion temperature of 675 ° C is superior in maximum efficiency to the hot rolling completion temperature of 860 ° C. In view of this, it is considered that the non-oriented electrical steel sheet according to the present embodiment is characterized in that the aggregate structure of the hot-rolled steel sheet is particularly improved in the case of a claw-pole motor.

(Example 4)

The steel of the composition shown in Table 7 was melted and continuously cast to make 200 mm. A thick flat embryo was heated to 1100 ° C and made into a 20 mm thick sheet by rough rolling. With respect to this sheet, the hot rolling ratio was set to be 95%, and the following two kinds of hot-rolled steel sheets were obtained: as the example of the present invention, the hot rolling completion temperature was set to 730 ° C, and finishing rolling was performed, and The hot-rolled steel sheet X having excellent magnetic properties in the direction of 45° in the rolling direction; and the general non-directionality in which the hot rolling completion temperature is 860° C. and the magnetic properties in the 45° direction from the rolling direction are not excellent as a comparative example. Hot rolled steel sheet Y. At the time of finishing hot rolling, the finishing hot rolling start temperature was set to 920 ° C, and the final station passing speed was set to 110 m / min. In order to control the hot rolling completion temperature, controlled cooling between stations and edge heaters and rod heaters disposed between the stations are used. Further, in order to compare the angular characteristics of the magnetic flux density of the electromagnetic steel sheet, the steel 10 was used, and at the same time, the finishing hot rolling start temperature was set to 920 ° C by the finish hot rolling, and the final station passing speed was set to 400 m. /min, a comparison material in which the hot rolling completion temperature was set to 730 °C. This is called steel 10-Z. The hot rolling conditions other than the hot rolling completion temperature are set to be the same as the steel 10-X by the cooling control. However, in the steel 10-Z, the controlled cooling in the refining hot rolling is obtained, and the hot rolling completion temperature equivalent to that of the steel 10-X is obtained.

As a result of measurement by SST with n number = 10, the hot rolled steel sheet X satisfies B50 (L + C) + 0.020 < B50 (45 - ave.). In Table 7, the measurement results of B50 (45-ave.) - B50 (L + C) are shown together with the components of the material to be tested.

At the same time, claw-type motors were fabricated using each hot-rolled steel sheet X and Y, and the maximum efficiency was investigated. When making a claw pole motor, change the radius R of the sheet metal bending process. When the hot-rolled steel sheet X of the present invention is used, the ratio is used. A comparison of the maximum efficiency of the claw pole type motor in the case of the hot rolled steel sheet Y is shown in Table 8.

As is clear from Table 8, when the radius R of the corner of the sheet metal working is 10 mm or less, the residual stress of the bending process is increased, and the effect of the present invention is remarkably exhibited. It is speculated that this may be when the radius R of the sheet metal processing is 10mm. In the case of the upper portion, the residual stress during the bending process is lowered, and when used as a motor, the flow of the magnetic flux of the core of the processed portion is improved, and it is less likely to be affected by the aggregate structure or the crystal structure of the hot-rolled steel sheet. To.

Further, in Table 8, when the steel sheet X of the example of the present invention is used, it is seen that the efficiency tends to be high when the radius R of the sheet metal bending process is small, but it is presumed that the radius of the corner is small. Since the groove full rate of the winding wire in the core is increased, the efficiency of the claw pole type motor is improved when a steel sheet which is generally less susceptible to residual stress by sheet metal processing is used as in the case of the present invention.

The steel 10-X, the steel 10-Y, and the steel 10-Z were cut at an angle with respect to the rolling direction, and an Epstein sample was measured to measure the value of the magnetic flux density B50. In addition to forming a cutting angle every 5°, a sample having a direction of 22.5° with respect to the rolling direction and a direction of 67.5° was taken. The sample was taken in a direction inclined by ±θ (°) with respect to the rolling direction, and the sample having an angle of 90° or more with respect to the rolling direction was set to be the same as θ=(180-θ). To handle.

The results of measuring the magnetic flux density B50 of each sample showed that the magnetic flux density B50 of the sample of ±45° with respect to the rolling direction in steel 10-X and steel 10-Z and the sample of ±135° Is the highest magnetic flux density B45max (steel 10-X) and B45max (steel 10-Z) in the sample measured by changing the angle. In the steel 10-Y, the rolling direction B0max (steel 10-Y) shows the highest magnetic flux density B50. Moreover, the result of setting these values as 1.000 to calculate the relative ratio of the magnetic flux density B50 of the sample of each angle is shown in FIG.

Finishing hot rolling final station that satisfies the hot rolling conditions of the present invention B45max (steel 10-X) with low speed finishing hot rolling at a speed of 110 m/min and B45max (steel 10-Z) with a finishing hot rolling final station passing speed of 400 m/min, the magnetic flux of the present invention The density shows a higher value. In Fig. 10, the average value of the four directions of ±45° and ±135° with respect to the rolling direction is shown as 45° on the horizontal axis. Further, the average value of the samples which are inclined at an angle of two directions of θ with respect to the rolling direction by ±45° is displayed as θ on the horizontal axis. Further, the rolling direction is 0°, and the plate width direction is 90° and is displayed on the horizontal axis.

As is apparent from Fig. 10, in the non-oriented electrical steel sheet of the present invention, B45max (steel 10-X) which is the maximum value of the magnetic flux density in the direction of ±45° and ±135° with respect to the rolling direction is 45. ° is a center value of 0.99 times the value of B45max (steel 10-X) in the range of 35° to 55° on the horizontal axis of ±10°, and 30 on the horizontal axis of ±15° A value equal to or greater than 0.99 times the B45max is maintained in the angular range of °~60°.

On the other hand, in the B45max (steel 10-Z) of the comparative example, the angle range of 40° to 50° on the horizontal axis of ±5° centered on 45° is less than 0.99 times. The angle range of 35° to 55° on the horizontal axis of ±10° is less than 0.98 times, and the magnetic flux density B50 is decreased from the direction of the angular shift in the direction of 45° which shows the maximum value of the magnetic flux density. It is remarkable. As can be seen from FIG. 10, in the B0max (steel 10-Y) of the comparative example, the value of the magnetic flux density B50 is the highest at θ=0° in the rolling direction, and the value of the magnetic flux density is in accordance with the present invention. When B45max (steel 10-X) is compared, the steel 10-X of the present invention has a lower B50 value in all measurement directions. Further, when the magnetic flux density of the comparative example is compared with the magnetic flux density of the example of the present invention by an absolute value, it is in the comparative example. In B0max (steel 10-Y), the value (absolute value) of the magnetic flux density B50 is the highest at θ = 0° in the rolling direction, and is 1.765T. On the other hand, the value of the magnetic flux density B45max (steel 10-X) of the present invention is 1.841T. Thus, the inventors of the present invention confirmed from the above FIG. 10 that the steel 10-X phase of the present invention shows a higher value of the magnetic flux density B50 in all measurement directions than the steel 10-Y of the comparative example.

As described above, according to the low-speed finishing hot rolling of the present invention, it is possible to obtain an electromagnetic steel sheet having a high magnetic flux density in the 45° direction over a larger range than the comparative example obtained by the prior art.

Industrial availability

The present invention can be applied to a stator core such as a small motor, a stepping motor, an alternator, a generator, or even a driving motor of an electric vehicle or a hybrid electric vehicle. Moreover, it can be applied as a non-oriented electrical steel sheet for core use.

1‧‧‧ non-directional electrical steel sheet

L‧‧‧Rolling direction

C‧‧‧ plate width direction

D1‧‧‧1st direction (direction 45° with respect to the rolling direction)

D2‧‧‧2nd direction (direction 45° with respect to the rolling direction)

D3‧‧‧3rd direction (direction 45° with respect to the rolling direction)

D4‧‧‧4th direction (direction 45° with respect to the rolling direction)

P‧‧‧board normal

Claims (6)

  1. A non-oriented electrical steel sheet which is a non-oriented electrical steel sheet for a stator core of a claw pole motor, characterized in that the magnetic flux density in a direction of 45° with respect to the rolling direction is larger than the rolling direction The magnetic flux density and the strip-shaped steel sheet having a larger magnetic flux density in the direction of the sheet width in the direction of 90° with respect to the rolling direction.
  2. The non-oriented electrical steel sheet according to claim 1, wherein the direction inclined by an angle of 45° counterclockwise with respect to the rolling direction is set to a first direction, and the direction inclined by an angle of 135° is set. In the second direction, a direction inclined at an angle of 45° clockwise about the normal to the plate surface with respect to the rolling direction is referred to as a third direction, and a direction inclined at an angle of 135° is referred to as a fourth direction. The average value of the magnetic flux density in the first direction, the magnetic flux density in the second direction, the magnetic flux density in the third direction, and the magnetic flux density in the fourth direction in the magnetization force 5000 A/m is set in units of T B50 (45-ave.), and the average value of the magnetic flux density in the rolling direction and the magnetic flux density in the sheet width direction in the magnetizing force 5000 A/m is set to B50 (L+C) in units of T , the following formula (1) will hold, B50 (L+C) + 0.020 < B50 (45-ave.) (1).
  3. The non-directional electrical steel sheet of claim 2, wherein The angle with respect to the rolling direction is included in a direction of a range of 0° to 90° counterclockwise around the normal to the plate surface, and the magnetic flux density in the first direction is the highest, and the angle is opposite to the rolling direction. The magnetic flux density in the second direction is the highest in a direction of 90° to 180° counterclockwise around the normal of the plate surface, and the angle with respect to the rolling direction is included in the clockwise normal to the plate surface. In the direction of the range of 0° to 90°, the magnetic flux density in the third direction is the highest, and the angle with respect to the rolling direction is included in a direction clockwise around the normal of the plate surface by 90° to 180°. The magnetic flux density in the fourth direction is the highest, and the following condition is satisfied: when the magnetic flux density in the first direction is B45max, the angle with respect to the first direction is included in the normal to the plate surface by ±10°. The magnetic flux density in the direction of the range is 0.99 × B45max or more, and the second direction, the third direction, and the fourth direction satisfy the same conditions.
  4. A method for producing a non-oriented electrical steel sheet, comprising: a hot rolling step, wherein a sheet obtained by rough rolling a flat blank is subjected to finishing hot rolling starting temperature of 800 ° C or more and 1150 ° C or less, and heat The hot rolling is performed under the conditions that the rolling completion temperature is less than 750 ° C and the rolling speed of the final station output side of the finishing hot rolling mill is 300 m / min or less; and the cold rolling step is obtained from the hot rolling step Hot rolled steel The cold rolling is performed at a rolling reduction ratio exceeding 87%.
  5. A method for producing a non-oriented electrical steel sheet, comprising: a hot rolling step, wherein a sheet obtained by rough rolling a flat blank has a finishing hot rolling starting temperature of 800 ° C or more and 1150 ° C or less, and heat Hot rolling is performed under the conditions of a rolling completion temperature of 800 ° C or less, a finishing hot rolling reduction of 94% or more, and a rolling speed of the final station output side of the finishing hot rolling mill of 300 m/min or less.
  6. A claw pole type motor is a claw pole type motor in which the non-oriented electrical steel sheet according to any one of claims 1 to 3 is used as a stator core, characterized in that it is punched into a direction of a claw pole. The stator core is formed with a strip-shaped billet at an angle of 45° with respect to the rolling direction of the non-oriented electrical steel sheet.
TW105109882A 2016-03-29 2016-03-29 Non-oriented electromagnetic steel sheet, manufacturing method therefor, and claw pole motor TWI575844B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001161054A (en) * 1999-11-30 2001-06-12 Sanyo Denki Co Ltd Permanent magnet stepping motor
TW200516827A (en) * 2003-09-16 2005-05-16 Honda Motor Co Ltd Claw pole motor stator
TW201230618A (en) * 2010-09-17 2012-07-16 Hoganas Ab Publ Rotor for modulated pole machine
JP2013201811A (en) * 2012-03-23 2013-10-03 Hitachi Automotive Systems Ltd Single-phase claw pole type motor
CN203481940U (en) * 2012-08-09 2014-03-12 美蓓亚株式会社 A claw-pole motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001161054A (en) * 1999-11-30 2001-06-12 Sanyo Denki Co Ltd Permanent magnet stepping motor
TW200516827A (en) * 2003-09-16 2005-05-16 Honda Motor Co Ltd Claw pole motor stator
TW201230618A (en) * 2010-09-17 2012-07-16 Hoganas Ab Publ Rotor for modulated pole machine
JP2013201811A (en) * 2012-03-23 2013-10-03 Hitachi Automotive Systems Ltd Single-phase claw pole type motor
CN203481940U (en) * 2012-08-09 2014-03-12 美蓓亚株式会社 A claw-pole motor

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