JP3087753U - Fixed structure of magnetic material for motor rotor - Google Patents

Abstract

(57) Abstract: Provided is a motor rotor magnetic material fixing structure capable of firmly fixing a magnetic material and improving the rotational torque and heat dissipation efficiency of the motor. A rotor is configured by stacking a plurality of silicon steel sheets, and a plurality of housing portions for housing magnetic materials depressed inward at the same distance are provided on an outer peripheral edge of the silicon steel sheets. A side surface 111 is provided between the housing portion 11 and the silicon steel sheet 1,
A side surface 112, a bottom surface 113, and an opening 114 facing the bottom surface 113 are formed. Side 111 and Side 1
The connecting portion between the base 12 and the bottom surface 113 has a recess 12, and the side surface 111, the side surface 112 and the bottom surface 113 are each cut into the recess 12 by the recess 12, and a plurality of leaf springs 13 are formed. The magnetic material is tightly fitted between the leaf springs 13 and is firmly fixed.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a structure for fixing a magnetic material of a motor rotor, and in particular, an accommodating portion in a silicon steel plate constituting the rotor has a plurality of leaf springs, and an inner edge of each of the leaf springs is slightly larger than a size of the magnetic material. The present invention relates to a structure for fixing a magnetic material of a motor rotor in which a magnetic material is firmly fixed by an elastic force generated because the magnetic material is small.

[0002]

[Prior art]

 The rotor of the motor is configured by stacking a plurality of silicon steel plates, and the periphery of the silicon steel plates has a plurality of concave grooves at the same distance. The dimensions of each groove are designed to be slightly larger than the magnetic material, and the magnetic material is placed in each groove after the adhesive is applied, and bonded by adhesion.

However, in the method in which the magnetic material is bonded by the adhesive method, when the motor is used for a certain period of time, the magnetic material may fall off at a high speed. In order to solve the problem that the adhered magnetic material is easy to fall off, the magnetic material is combined with the rotor in an embedded manner. As shown in FIGS. 4 and 5, a silicon steel plate 8 of another conventional motor has a fixing hole 81 provided at a central portion to penetrate a core shaft. The outer peripheral portion of the silicon steel plate 8 has through holes 82 provided for placing the magnetic material 9 and arranged at the same distance. Since the through-hole 82 is coupled to the magnetic material 9 in the form of an interference fit, it is buried in the through-hole 82 and firmly fixed when installed.

Since the magnetic material 9 is firmly fixed in the through hole 82, the size of the through hole 82 is designed to be smaller than the size of the magnetic material 9, but the magnetic material 9 is made of a material that is easily broken. Therefore, if the magnetic material 9 is forcibly pushed into the through hole 82, the magnetic material 9 may be cracked and defective products may be generated.

After the magnetic material 9 is buried and installed, the magnetic material 9 is in close contact with the periphery of the through hole 82, so it is difficult to radiate heat generated during rotation of the rotor, and the magnetic material 9 is heated due to a rise in temperature. The problem of reduced efficiency occurs. When there is no fixed distance between the through hole 82 and the outer peripheral edge of the silicon steel plate 8, the strength for fixing the magnetic material 9 is insufficient. This constant distance increases the distance between the magnetic material 9 and the stator 91 on the outer periphery of the rotor, increases the gap H between the magnetic material 9 and the stator, and reduces the problem of motor torque reduction. Therefore, the above-mentioned structure for fixing the magnetic material needs to be improved.

[0006]

[Problems to be solved by the invention]

 According to the present invention, a plurality of leaf springs are formed in the accommodating portion at the peripheral edge of each silicon steel plate, a magnetic material is provided in the accommodating portion, and the respective leaf springs are slightly elastically deformed, and are uniformly distributed by the elastic force of the respective leaf springs. A main object of the present invention is to provide a motor rotor magnetic material fixing structure in which a magnetic material is sandwiched and which stably fixes the magnetic material.

According to the present invention, when the magnetic material is placed in the housing, the leaf springs are deformed, and the size of the housing is increased, so that the magnetic material is easily placed and the magnetic material is not damaged. It is another object of the present invention to provide a fixing structure for a magnetic material. According to the present invention, since each housing is recessed inward from the outer peripheral edge of the silicon steel sheet, the magnetic material is provided in the housing and then further approaches the stator, and the gap between the magnetic material and the stator is reduced. It is another object of the present invention to provide a structure for fixing a magnetic material of a motor rotor, which can reduce the motor torque and improve the rotational torque of the motor.

When the magnetic material is placed in the storage portion, the magnetic material is tightly fixed by a plurality of leaf springs formed by cracks in the recess, and the periphery of the magnetic material flows through the air formed by the recess. Therefore, the heat dissipation efficiency of the magnetic material during operation of the motor is improved. In addition, since the outside of the magnetic material is exposed to the gap formed by the rotor and the stator, heat is more easily dissipated than the embedded type, and the motor rotation that can avoid the adverse effects caused by the heat of the magnetic material can be avoided. It is another object to provide a fixing structure for a magnetic material.

[0009]

[Means for Solving the Problems]

 According to the structure for fixing the magnetic material of the motor rotor according to the first aspect of the present invention, the rotor is formed by stacking a plurality of silicon steel plates, and the magnetic material is recessed inward at the outer periphery of each silicon steel plate at the same distance. A plurality of housing portions are provided, two side surfaces, a bottom surface, and an opening facing the bottom surface are formed between each housing portion and the silicon steel plate. It has a recessed portion, whereby the two side surfaces and the bottom surface in each of the housing portions are respectively cut into the two recessed portions to form a plurality of leaf springs, and a tight fit between the leaf springs and the magnetic material is provided. State. According to the motor rotor magnetic material fixing structure according to the second aspect of the present invention, the opening of the housing is slightly narrower than the width of the inside of the housing, and the two side surfaces have a slope gradually expanding from the outside to the inside. Present.

[0010]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1 to FIG. 3, the motor rotor according to one embodiment of the present invention is configured by stacking a plurality of silicon steel plates 1. A plurality of accommodating portions 11 accommodating the magnetic material 2 are provided on the outer peripheral edge of the silicon steel sheet 1 at the same distance and inward. Side surfaces 111 and 112, a bottom surface 113, and an opening 114 facing the bottom surface are separately formed between the housing portion 11 and the silicon steel plate 1. The opening 114 is formed to be smaller than the width of the inside of the accommodating portion 11, and the side surface 111 and the side surface 112 are slopes gradually expanding from the outside to the inside. The side surface 111 and the connecting portion between the side surface 112 and the bottom surface 113 each have a concave portion 12. The side surface 111, the side surface 112, and the bottom surface 113 of the housing portion 11 are each cut into the recessed portion 12 to form a triple leaf spring 13. An interference fit is formed between the three-plate spring 13 and the magnetic material, and a central portion of the silicon steel plate 1 has a through hole 14 for penetrating a core shaft.

When the magnetic material 2 is placed in the above-described structure, each leaf spring 13 is pressed by the magnetic material 2 and deforms. Therefore, when the magnetic material 2 is placed, the size of the housing portion 11 is increased by the deformation of the leaf spring 13. Therefore, when the magnetic material 2 is tightened, the magnetic material 2 is not damaged. After the magnetic material 2 is arranged, the magnetic material 2 is firmly held by the elastic force generated by the elastic deformation of the three-plate spring 13, and the magnetic material 2 is stably fixed. Since the opening 114 is slightly narrower than the width of the inside of the accommodating portion 11, the side surface 111 and the side surface 112 are slopes gradually expanding from the outside to the inside. Therefore, the magnetic material 2 held between the three leaf springs 13 does not fall off due to the high-speed rotation of the motor.

The housing 11 is partially in contact with the magnetic material 2 by a three-plate spring 13, and the recess 12 is a path through which air can flow. Since the heat generated in the magnetic material 2 during the rotation of the rotor is exhausted by the flowing air, the problem of a decrease in the magnetic energy generated by the temperature rise of the magnetic material 2 can be avoided. Further, since each of the accommodating portions 11 is depressed inward from the outer peripheral edge of the silicon steel sheet 1, the magnetic material 2 is provided in the accommodating portion 11 and then approaches the stator 3 further. Therefore, the gap h between the magnetic material 2 and the stator 3 can be reduced, and as shown in FIG. 3, the rotational torque and efficiency of the motor can be improved.

The present invention has the following effects. (A) The plurality of leaf springs 13 in the housing 11 firmly hold the magnetic material 2 by the elastic force generated by the elastic deformation, so that the magnetic material 2 can be fixed stably.

(B) When the magnetic material 2 is placed in the housing portion 11, each leaf spring 13 slightly deforms, so that the magnetic material 2 is easy to enter and the magnetic material 2 is not damaged. (C) After the magnetic material 2 is provided in the accommodating section 11, the magnetic material 2 comes closer to the stator 3, so that the gap h between the magnetic material 2 and the stator 3 can be reduced. The rotational torque and efficiency of the motor can be improved.

(D) When the magnetic material 2 is placed in the accommodating portion 11, the recessed portion 12 becomes a path through which air flows, and the magnetic material 2 in the opening 114 is directly formed by the rotor and the stator. As a result, the heat dissipation efficiency during rotation of the motor can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a structure for fixing a magnetic material of a motor rotor according to an embodiment of the present invention;

FIG. 2 is a schematic view showing a structure for fixing a magnetic material of a motor rotor according to an embodiment of the present invention;

FIG. 3 is a schematic view showing a structure for fixing a magnetic material of a motor rotor according to an embodiment of the present invention;

FIG. 4 is a front view showing a silicon steel plate of a conventional motor.

FIG. 5 is a schematic view showing a silicon steel plate of a conventional motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Silicon steel plate 11 Housing part 12 Depression part 13 Leaf spring 111 Side surface 112 Side surface 113 Bottom surface 114 Opening

Claims (2)

[Utility model registration claims] A rotor is formed by stacking a plurality of silicon steel plates, and a plurality of storage portions for receiving a magnetic material recessed inward at the same distance are provided on an outer peripheral edge of each of the silicon steel plates. Two side surfaces, a bottom surface, and an opening opposed to the bottom surface are respectively formed between the silicon steel plates, and a connection portion between the two side surfaces and the bottom surface has a recessed portion, respectively. The two side surfaces and the bottom surface of the housing portion are each cut into the two recessed portions to form a plurality of leaf springs, and the space between the leaf springs and the magnetic material are tightly fitted. A fixing structure for a magnetic material of a motor rotor, characterized by: 2. The motor rotation according to claim 1, wherein the opening of the housing portion is slightly narrower than the width of the inside of the housing portion, and the two side surfaces exhibit a slope that gradually widens from outside to inside. Fixed structure of magnetic material.