JPH05300675A - Rotor for motor or generator - Google Patents

Abstract

PURPOSE:To improve the magnetic properly or mechanical strength of a rotor for a motor or a generator by constituting the rotor for a motor of a generator, using a stack fused magnetic material. CONSTITUTION:A magnetic core material 1, which is made by stamping a non-oriented silicon steel plate plated with Cu or Sn, is provided with a slot 2, through which a copper bar corresponding to rotor winding passes, and a rotor shaft hole 3, in which the rotor shaft 7 is inserted. Next, magnetic core materials 1 stamped from a plated non-oriented silicon plate are stacked, and copper short-circuit rings 4 are arranged at both ends, and threaded copper bars 5 are passed into the slots 2 of the magnetic core materials 1, and the magnetic core materials 1 and the short-circuit rings 4 are fastened with bolts and nuts 6. Moreover, a rotor shaft 7, which is plated, at the section in contact with the magnetic core materials 1, with Cu, is inserted into the rotor shaft holes 3 of the magnetic core materials. And these are put in a jig for annealing and are annealed, whereupon the magnetic core materials 1, the copper bars 5, and the nuts 6, and the short-circuit rings 4 are united into a motorrotor of high mechanical strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mover for a motor or a generator.

[0002]

2. Description of the Related Art Recently, high-speed motors have been used in high-end machine tools and
Demand for compressor motors for high-performance coolers is increasing, and induction motors and brushless motors are mainly studied and used. The problem with this high-speed motor is that it is driven at a high frequency due to high speed, the motor temperature rises due to power loss such as iron loss and copper loss, and motor performance is limited. Since a strong centrifugal force is generated by the moving element such as the rotor, high mechanical strength is required. Electric power loss includes iron loss and copper loss, and copper loss is consumed by a conductor wire. Since the type of material used is limited, it depends only on the reduction in the amount of current. In order to keep the motor output unchanged while reducing the current amount, a method of increasing the magnetic flux is used. Then, in the iron core as it is, the magnetic flux density is increased, and the iron loss rapidly increases. Therefore, a method of reducing the magnetic flux density by increasing the amount of the iron core and reducing the total iron loss is being studied. Along with this, the motor becomes large, and the size of the mover such as the rotor also becomes large. Therefore, when the rotor or the like is rotated at a constant number of revolutions, the centrifugal force becomes large and the mechanical strength becomes a problem. Therefore, as a magnetic material for rotors,
A pure iron type is used as one body, but there is a problem in magnetic characteristics. For example, it is not possible to obtain better magnetizing characteristics and iron loss than those of a silicon steel sheet normally used for a motor.
However, when ordinary silicon steel sheets are used, they are laminated and used, so that the mechanical strength such as the rigidity required for the rotor and the like cannot be obtained, and the rotor dimensional accuracy required for high-speed rotation is also difficult to obtain. However, there is a problem that the balance of the center of gravity cannot be obtained.

Against this background, there is a demand for a motor mover having excellent magnetic properties and high mechanical strength.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the problems of the prior art described above, has excellent magnetic properties, high mechanical strength such as tensile strength and rigidity, and can be obtained at low cost It was made for the purpose of providing a mover for a motor or a generator having excellent magnetic properties and high mechanical strength by using a magnetized material.

[0005]

The feature of the present invention resides in a mover for a motor or a generator using a laminated fusion magnetic material.

Further, a feature of the present invention resides in a motor or a generator provided with the above-mentioned motor or generator mover.

The present invention will be described in detail below.

First, the motor may be of any type, such as a rotating motor or a motor that performs linear motion, and may be a DC machine, a synchronous machine, an induction machine, or the like, as long as the present invention can be used. The generator can be of any type. A mover is a rotor that rotates a motor,
A linear motor or the like that moves linearly is shown. Laminated fusion magnetic material means that copper, tin,
After zinc or the like is plated, processing and the like are performed as needed, they are laminated or combined according to the purpose, and then heated and seized to form an integrated or molded product.

The magnetic material referred to here is a general magnetic material, such as a magnetic steel sheet such as a silicon steel sheet, a magnetic soft iron, a magnetic material such as cobalt or nickel, and other magnetic materials can also be used to drive the motor of the present invention. It is good if it can be used as a child, and it is mainly one that can be plated, and it is also good if other things can cause seizure and the like. The shape is not limited, and any shape such as plate, wire, powder and the like may be used as long as the present invention can be applied. In addition, this magnetic material
It is not necessary that the final magnetic properties are obtained. It is sufficient that the final magnetic characteristics can be obtained in a process such as a seizure annealing that is performed before the final use state of the motor mover. For example, in the case of a silicon steel plate, a cold-rolled plate or the like may be used as the material of the laminated fusion-bonded magnetic material, or a material that can obtain magnetic characteristics by baking and annealing.

Copper, aluminum, nickel, tin, zinc, etc., and alloys thereof can be used as the material plated on the surface of the magnetic material. The plating thickness is
The higher the electric resistance of the laminated or combined magnetic materials, the smaller the better. Also, the thickness required to promote the seizure between materials and to ensure the sufficient mechanical strength of the laminated materials and combination forming body. Must be The type of material plated on the surface of the material needs to be determined according to the difficulty of plating and the required magnetic circuit characteristics.
When a magnetic flux flows in a direction perpendicular to the length direction of the magnetic material, it is preferable to select a plating material having excellent magnetization characteristics such as nickel. On the contrary, when a magnetic flux flows in the plane of the magnetic material or in the linear direction, a nonmagnetic material may be plated. It is not necessary for all materials to be plated. If a state such as seizure can be obtained and the necessary mechanical strength can be obtained, a part of the material may be used, or a part or one surface of the material may be used instead of the entire surface. Also,
One or more kinds of plating materials may be combined together.

When the magnetic materials are laminated or combined, the magnetic materials are arranged so that the easy axes of magnetization of the magnetic materials are aligned as much as possible along the magnetic flux flow to be used, or the shape magnetic anisotropy is utilized. Use the shape and arrangement of. For example, if the easy axis of magnetization is aligned with the rolling direction of the material, such as a unidirectional silicon steel sheet or a bidirectional silicon steel sheet, arrange the rolling direction as closely as possible along the magnetic flux flow to be used. Alternatively, the plate surface of the plate-shaped magnetic body or the linear direction of the linear magnetic body may be aligned so as to follow the magnetic flux flow to be used. Before laminating or combining this magnetic material, it is preferable to preliminarily process it into a shape that is finally used as a motor mover or a shape that takes into consideration the magnetic flux flow described above. This processing is cutting or punching, and if necessary, molding processing may be used. When this forming process is used, it is also effective in increasing the contact area in order to sufficiently burn the materials after forming the combination and in increasing the space factor of the obtained magnetic material.

After laminating and combining magnetic materials and the like,
Annealing is performed to cause seizure between materials. This baking is due to the dissolution of the plating material at high temperature, the chemical reaction between the plating materials, the chemical reaction between the material to be laminated or combined and the plating material, and further the adhesive development occurs at high temperature. It is the one to be confused. The surface of the magnetic material, etc. must be clean and free from oil or foreign matter, and have a low surface roughness in order to allow sufficient seizure between materials to form a magnetic material with high mechanical strength. It is necessary. To clean the surface of the magnetic material or the like, pickling or oil washing may be performed. It is also necessary to consider the thermal strain due to the temperature difference during annealing, which is a process such as seizure. Annealing causes seizure between materials, and also releases strain of a combination-formed body such as a magnetic material that has been molded.

Further, in the final motor mover, the temperature and time required to provide the necessary mechanical strength must be achieved. In this annealing step, in order to maintain a predetermined shape of the laminated or combination-formed body of the magnetic material that has been formed and processed, and to promote seizure between the materials, the annealing is
Formed bodies such as laminations and combinations of molded magnetic materials must be performed under pressure. However, the pressing means can be omitted if the same effect can be obtained by the weight of the combination forming body of the laminated or molded materials. Also,
Annealing is preferably performed in a reducing atmosphere.

The material of the laminated fusion-bonded magnetic material is mainly the above-mentioned magnetic material, but if necessary, a material other than the magnetic material may be partially combined. For example, when the motor mover is bonded to another portion, seizure or the like may be performed at the same time.

For the purpose of the present invention, it is necessary to increase the electric resistance of the motor mover. For that purpose, it is advisable to use an electric resistivity of 20 μΩcm or more for the magnetic material of the laminated fusion-bonded magnetic material.

For that purpose, when the material is a silicon steel sheet, it is preferable that the silicon content is 1% by weight or more and 7% by weight or less.

As the plating material applied to the laminated fusion magnetic material material, one or more of copper, tin, zinc, or alloys thereof, which have already been described, have high mechanical strength. Is easy to obtain. When copper and tin are used as the plating material and a cold rolled sheet of silicon steel sheet is used as the material of the laminated fusion-bonded magnetic material, the final annealing and the seizure annealing of the silicon steel sheet can both be performed.

A motor mover magnetic core is formed by using this laminated fused magnetic material. Before baking and annealing the laminated fusion-bonded magnetic material, it is preliminarily processed into a shape that is finally used as a motor mover or a shape that takes into consideration the magnetic flux flow already described, and then laminated or combined and baked and annealed. Then, a motor mover magnetic core or a final product of the motor mover magnetic core can be obtained. After the laminated fused magnetic material is prepared, it may be processed into the final shape. Alternatively, a part may be processed when laminating and fusing, and the remaining part may be processed after laminating and fusing. At this time, the laminated fusion magnetic material can be used in any shape by combining magnetic materials suitable for a predetermined magnetic circuit, and if a high electric resistance material is used,
It is possible to suppress eddy currents in the motor mover magnetic core that occur during high-speed rotation. Further, since the mechanical strength is high, there are few mechanical problems of the motor mover. In particular, when the motor mover magnetic core becomes complicated, if a laminated fused magnetic material is made by arranging a directional silicon steel plate along the magnetic flux flow and an easy axis of magnetization is used as the motor mover, this is not usually possible. A motor mover core is also possible.

Next, a motor mover is made using this motor mover core. The motor mover core may be made and later assembled to the motor mover, but if possible, a step of making a laminated fusion magnetic material. Inside, other parts of the motor mover, for example, copper or aluminum corresponding to the shaft or the mover winding, or short-circuit rings arranged at both ends of the motor mover core are combined to form a laminated fusion magnetic material and at the same time. A motor mover or a final product of the motor mover magnetic core may be formed. Further, at this time, the shaft of the motor mover and the motor mover magnetic core may be bonded and fixed, and further, copper or aluminum corresponding to the mover winding, or a short circuit arranged at both ends of the motor mover magnetic core. The ring or the like and the motor movable element magnetic core may be adhered and fixed.

Therefore, such a motor mover is
It has excellent magnetic properties and high mechanical strength. When this motor mover is used in a high-speed motor, it is possible to obtain more than conventional performance.

The motor mover and the power generator mover using the laminated fusion-bonded magnetic material of the present invention exhibit high mechanical strength.
Such as high speed rotation. In the case of a rotor, the stress on the magnetic core material due to the centrifugal force at high speed is proportional to the square of the product of the rotor diameter and the number of revolutions.
The product of the number of rotations per minute is 3 × 10 ⁶ or more, which is effective. With the rotor diameter D _o mm, the density dg / cm ³ of the material of the laminated fusion-bonded magnetic material of the magnetic core, and the rotation speed n rpm, the tensile stress σ applied to the material is roughly estimated, and the stress due to gravity is ignored, and the magnetic core diameter D _i mm By the way, it is approximately σ to 10 ^-13 × dD _o ³ n ² / D _i kg / mm ² , and the tensile strength of ordinary silicon steel sheet is generally 40 kg /
If it is less than mm ² and more strength is required, d
= 8 g / cm ³ and D _o / D _i = 4, D _o n> 3 ×
Must be 10 ^6, the locally include those caused by gravity imbalance, it is desired that a D _o n ≧ 10 ^6.

Although the motor has been described above, the same can be applied to the generator.

[0023]

[Embodiment 1] Referring to FIG. 1, a 0.35 mm non-oriented silicon steel sheet having a Si content of 6.5% used in a motor mover of the present invention is first plated with Cu to a thickness of 1 μm. S
Magnetic core material 1 punched out by n-plating 0.2 μm
Indicates. In this magnetic core material 1, slots 2 through which copper rods corresponding to rotor windings pass and rotor shaft holes 3 into which rotor shafts are inserted
Is provided.

FIG. 2 shows a motor mover using the punched magnetic core material 1 of the plated non-oriented silicon steel plate shown in FIG. 1 is laminated, and copper short-circuit rings 4 are provided on both ends thereof.
And the copper rod 5 that is a bolt
The magnetic core material 1 and the short-circuit ring 4 are bolted with the copper nut 6 through the slot 2 and the rotor shaft 7 is passed through the rotor shaft hole 3 of the magnetic core material 1. Rotor shaft 7
Is obtained by plating the portion in contact with the magnetic core material 1 with 1 μm of copper. This was placed in an annealing jig and annealed at 850 ° C. for 2 hours in a reducing atmosphere. By this annealing, the magnetic core material 1, the copper rod 5 which is a bolt, the copper nut 6 and the copper short-circuiting ring 4 are integrated to form a motor mover with high mechanical strength. Further, the fixing force increases due to the adhesion of the rotor shaft and the magnetic core material 1.

[Embodiment 2] FIG. 3 shows that a 0.3 mm grain-oriented silicon steel sheet having a Si content of 6.5% and a non-oriented silicon steel sheet used in the motor rotor of the present invention are first Cu-plated to 1 μm. A magnetic core material using a Sn-plated 0.2 μm film is shown below. Magnetic core pieces 8 and 9 punched out of grain-oriented silicon steel used for the outer circumference of the rotor are shown.
The width of the magnetic core piece 9 is increased by the width 10. The direction in which the rolling direction of this grain-oriented silicon steel sheet has excellent magnetization characteristics is defined as 1
Shown in 1. The magnetic core pieces 12 and 13 punched out from a non-oriented silicon steel sheet used for the inner circumference of the rotor are shown. The outer diameter of the magnetic core piece 13 is smaller than the outer diameter of the magnetic core piece 12 by a width 14 so as to correspond to the magnetic core pieces 9 and 10 used outside the rotor.

FIG. 4 shows a motor rotor magnetic core which is assembled and seizure-annealed. As shown in the figure, the magnetic core pieces 9 and 10 are stacked in a staggered manner, and the magnetic core pieces 12 and 13 are arranged inside, and are integrated after baking and annealing. In the motor rotor, since the magnetic flux density is high in the portion between the slots, a grain-oriented silicon steel sheet having a good magnetization characteristic is arranged in that portion to improve the magnetic circuit characteristic of the rotor. Since a rotating magnetic field is applied inside the rotor,
A non-oriented silicon steel plate is used. A high-speed motor using this rotor magnetic core can use a high magnetic flux density in the rotor and can be downsized.

[0027]

EFFECTS OF THE INVENTION According to the present invention, by using a laminated fusion magnetic material which has excellent magnetic properties, high mechanical strength such as tensile strength and rigidity, and which can be obtained at low cost, excellent magnetic properties and high It is possible to provide a mover for a motor or a generator having mechanical strength.

Since the motor mover core used in the motor mover of the present invention uses the laminated fusion material, it has high mechanical strength and can withstand the stress generated in the motor mover core during high speed rotation. In particular, when a silicon steel sheet of 6.5 wt% Si is used, it is possible to withstand tensile stress generated by centrifugal force or the like even at 100 kg / mm ² or more. In addition, the easy axis of magnetization can be aligned along the magnetic flux flow that provides an efficient magnetic flux distribution for driving the motor.
Eddy current can be suppressed by forming an ideal magnetic circuit and by using a magnetic material having a high electric resistance as the material of the laminated fused magnetic material. Therefore, the magnetic circuit characteristics are excellent, the iron loss of the mover magnetic core can be reduced, and the industrial value is great. Also,
At this time, the shaft of the motor mover and the motor mover magnetic core may be adhered and fixed, and further copper or aluminum corresponding to the mover winding, or a short-circuit ring arranged at both ends of the motor mover core. And the motor mover magnetic core may be adhered and fixed, and also has a role of increasing the mechanical strength of the motor mover. If sufficient strength can be maintained, it is possible to fix with this adhesive.

Lathe processing of a pure iron-based material increases the processing cost, but the use of the laminated fusion-bonded magnetic material has an economical advantage because it can be used for low-cost punching processing. The mover of the present invention can be applied not only to a motor but also to a generator.

Therefore, such a motor mover has excellent magnetic characteristics and high mechanical strength, and when this high motor mover is used for a high speed motor, it is possible to obtain more than conventional performance.

[Brief description of drawings]

FIG. 1 shows a magnetic core material used in a motor rotor of the present invention.

FIG. 2 shows a rotor using the magnetic core material shown in FIG.

FIG. 3 shows a magnetic core material used in the motor rotor of the present invention.

4 shows a rotor magnetic core using the magnetic core material shown in FIG.

[Explanation of symbols]

 1 Magnetic Core Material 2 Copper Rod Slot 3 Rotor Shaft 4 Short-Circuiting Ring 5 Copper Rod 6 Nut 7 Rotor Shaft 8 and 9 Magnetic Core Piece 11 Direction with Excellent Magnetization Characteristics 12, 13 Magnetic Core Piece

Claims (6)

[Claims] 1. A mover for a motor or a generator using a laminated fused magnetic material. 2. A mover for a motor or a generator according to claim 1, wherein the material of the laminated fusion-bonded magnetic material has an electric resistivity of 20 μΩcm or more. 3. The mover for a motor or a generator according to claim 2, wherein the material of the laminated fusion-bonded magnetic material is a silicon steel plate containing silicon in an amount of 1% by weight or more and 7% by weight or less. 4. The motor or generator mover according to claim 1, wherein the material of the laminated fusion-bonded magnetic material is a magnetic material plated with one or more of copper, tin, zinc, or an alloy thereof. .. 5. The product of the rotor diameter in millimeters and the number of revolutions per minute is 10 ⁶ or more.
Alternatively, the mover for the motor or the generator according to 4 above. 6. A motor or generator comprising the motor or generator mover according to claim 1, 2, 3 or 4.