JP2005287138A - Structure of motor rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the structure of a motor rotor which generates a magnetic field of sinusoidal or trapezoidal waveform. <P>SOLUTION: Many silicon steel plates 1 are accumulated and constituted. Many accommodation parts 11 for accommodating magnetic material which puts equal distance on the peripheral edge of each silicon steel plate 1 and presents a hollow, are provided. The accommodation part 11 has a bottom 111 and an aperture 112, and presents the state contracted upward from the bottom 111. The bottom 111 and the aperture 112 continue on two side faces. A protrusion 13 protruding in the aperture 112 direction is formed in the bottom 111. When the magnetic material is engaged within the accommodation part 11, the magnetic material is made to contact with the upper edge of the protrusion 13. When an electricity is put and the rotor is rotated, the magnetic field of a sine waveform is generated as operating with a stator. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure of a rotor in a motor, and in particular, a motor that generates a magnetic field having a sinusoidal waveform or a trapezoidal waveform when the rotor rotates due to a configuration in which a magnetic material can be fitted to the periphery of the rotor. Relates to the structure of the rotor.

A rotor of a conventional motor is configured by stacking a large number of silicon steel plates, and a plurality of recesses are provided on the periphery of the silicon steel plates to accommodate magnetic materials at equal distances. The dimensions are designed to be slightly larger than the dimensions of the magnetic material, and when the magnetic material is coated with an adhesive and fitted in the recess, they are combined.
However, in the method of bonding the magnetic material by the adhesion method, when the rotor rotates at a high speed for a long time, the magnetic material sometimes drops off in a high-speed rotation state.

  In order to solve the above problem, a method of bonding the magnetic material by an embedding method is adopted, and as shown in FIGS. 7 and 8, it is another type of silicon steel plate 7, which is a central portion of the silicon steel plate 7. Is provided with a fixing hole 71 for inserting a motor shaft, and a plurality of accommodating portions 72 for accommodating the magnetic material 8 at equal distances are provided on the periphery of the silicon steel plate 7. The fit with the magnetic material 8 is a motion fit, and when the magnetic material 8 is embedded in the accommodating portion 72, the magnetic material 8 is wrapped and fixed.

  In order to easily fix the magnetic material 8 in the accommodating portion 72, the dimension of the accommodating portion 72 is designed to be larger than the dimension of the magnetic material 8, so that when the rotor rotates at high speed, the magnetic material 8 Cannot fit into the accommodating portion 72, and a collision sound is generated. Conversely, if the size of the accommodating portion 72 is designed to be smaller than the size of the magnetic material 8, the magnetic material 8 is made of a material that can be easily broken, so that if the magnetic material 8 is strongly pushed into the accommodating portion 72. The magnetic material 8 is easily broken.

As shown in FIG. 8, the peripheral edge of the accommodating portion 72 and the silicon steel plate 7 is added with the width of the outer edge of the silicon steel plate surrounding the magnetic material 8 in addition to the gap H1 between the rotor and the stator. The guiding distance between 8 and the stator is quite large. The silicon steel plate 7 fixes the magnetic material 8 with sufficient strength, but its width increases the distance between the magnetic material 8 and the periphery of the rotor, so that the torque and efficiency of the motor are reduced.
Further, when the motor rotor generates a magnetic field having a desired sinusoidal or trapezoidal waveform, an extremely complicated circuit is required, so that there remains room for improvement in the motor rotor.

  The main object of the present invention is to provide a plurality of accommodating portions spaced equidistantly around the periphery of the silicon steel plate, and the accommodating portion is reduced from the inside to the outside, so that the magnetic material is fitted into the accommodating portion. When the magnetic material is sandwiched and fixed by elastic deformation of the housing portion and abuts against the protrusion at the bottom of the housing portion, when rotating, it acts with the stator to generate a magnetic field, and the magnetic field waveform is a sine waveform Alternatively, a motor having a trapezoidal waveform, a sinusoidal magnetic field has a smooth start-up, a small starting current, a high localization accuracy, and a trapezoidal magnetic field has a large starting torque and instantaneous torque. Provides a rotor structure.

  The next object of the present invention is to provide a structure of a rotor in a motor in which the clearance between the magnetic material and the stator is made closer so that the gap becomes smaller and the motor torque increases.

  In order to achieve the above object, the present invention is configured by stacking a large number of silicon steel plates, and the periphery of each silicon steel plate is provided with a large number of accommodating portions for accommodating magnetic materials which are equidistant and exhibit depressions. The accommodating portion has a bottom surface and an opening, the accommodating portion is configured to shrink upward from the bottom surface, and the bottom surface and the opening are continuous on two side surfaces, and an opening is formed in the bottom surface of the accommodating portion. A protrusion projecting in the direction, and when the magnetic material is fitted into the housing portion, the magnetic material abuts on the upper edge of the protrusion, and acts as a stator when rotating by turning on electricity. The gist of the present invention is the structure of the rotor in the motor, characterized in that a sinusoidal magnetic field is generated.

The present invention has the following effects.
(B) Since a plurality of accommodating portions placed at equal distances are provided on the periphery of the silicon steel plate and the accommodating portion is reduced from the inside to the outside, when the magnetic material is fitted into the accommodating portion, the magnetic material Since it is sandwiched and fixed by elastic deformation of the housing part and abuts against the protrusion at the bottom of the housing part, when rotating, it acts with the stator to generate a magnetic field, and the magnetic field waveform exhibits a sine or trapezoidal waveform. The sinusoidal magnetic field has characteristics such as smooth start-up, low start-up current, and high localization accuracy, and the trapezoidal waveform magnetic field has characteristics of large start-up torque and instantaneous torque.
(B) By making the distance between the magnetic material and the stator closer, the gap becomes smaller, and the torque of the motor increases.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
Please refer to FIG. 1 to FIG. The embodiment shown in the drawings is an example for explaining the present invention, and is not intended to limit the scope of claims of the present invention.

  The structure of the rotor in the motor according to one embodiment of the present invention is configured by stacking a large number of silicon steel plates 1, and the periphery of each silicon steel plate 1 is for accommodating a magnetic material 2 exhibiting depressions that are equidistant. In the present embodiment, the magnetic material 2 is a permanent magnet, the storage portion 11 has a bottom surface 111 and an opening 112, and the storage portion 11 contracts upward from the bottom surface 111. The bottom surface 111 and the opening 112 are continuous on two side surfaces 113, and the two side surfaces 113 have slopes that increase from the outside to the inside. A recess 12 is provided at a location where the projection 11 is in contact, and a protrusion 12 protruding in the direction of the opening 112 is provided on the bottom surface 111 of the housing 11, and the protrusion 12 is located at the center of the bottom 111. Magnetic When the material 2 is fitted into the accommodating portion 11, the magnetic material 2 comes into contact with the upper edge of the protrusion 12, and a fixing hole 14 for inserting a motor shaft into the center of the silicon steel plate 1. Is opened.

  When the magnetic material 2 is fitted into the accommodating portion 11, the opening 112 of the accommodating portion 11 is pushed by the magnetic material 2 and a slight amount of deformation occurs, and the amount of deformation increases the size of the opening 112 of the accommodating portion 11. Then, the magnetic material 2 can be smoothly fitted into the accommodating portion 11. When the magnetic material 2 is fitted into the accommodating portion 11, the opening 112 that is pushed and deformed firmly holds the magnetic material 2 by the elastic force generated by the deformation, and the width of the bottom surface 111 of the accommodating portion 11 is open. Since it is larger than the width of 112, the magnetic material 2 can be more stably fixed in the accommodating portion 11, and does not detach from the accommodating portion 11 even if rotated at a high speed.

  Further, since the stator 4 is an electromagnetic magnet, when the power is supplied to the stator 4 and the rotor of the motor, the stator 4 acts on the magnetic material 2 in the rotor to generate a magnetic field, thereby generating a motor. And the magnetic material 2 comes into contact with the upper edge of the protrusion 13 in the accommodating portion 11, so that when the rotor rotates, the magnetic material 2 acts on the electromagnetic magnet of the stator 4 to generate a magnetic field. As shown in FIG. 3, the magnetic field has a sinusoidal waveform, and the sinusoidal magnetic field generated by the magnetic material 2 and the stator 4 has a smooth startup, a small startup current, and a high localization accuracy. Therefore, the present invention can be applied to facilities having more complicated driving circuits and higher cost. For example, it can be applied to precision machine tools, national defense industry, and precision valve angle control.

Moreover, as shown in FIG. 4, since the accommodating part 11 is located in the periphery of the silicon steel plate 1, when fitting the magnetic material 2 in the accommodating part 11, the clearance gap H becomes the minimum and the efficiency of a motor is improved. improves.
As described above, the structure of the rotor in the motor or the generator according to the present embodiment can stably fix the magnetic material 2 in the housing portion 11 by the form of the housing portion 11 and the silicon steel plate 1, and When the magnetic material 2 is fitted and fixed in the accommodating portion 11, the magnetic material 2 comes into contact with the upper edge of the protrusion 13. Therefore, when the power is turned on and the rotor is rotated, the magnetic material 2 becomes the stator. 4 generates a sinusoidal magnetic field, and the sinusoidal magnetic field does not require a very complicated control circuit as in a conventional motor.

  Of course, there are many other embodiments of the present invention, which are only changes in detail. Please refer to FIG. 5 and FIG. This is a second embodiment of the present invention, the bottom surface 111 of the housing portion 11 is provided with two protrusions 13, the two protrusions 13 project from the bottom surface 111 toward the opening 112, The two protrusions 13 are located on both sides of the center of the bottom surface 111, and the magnetic material 2 comes into contact with the upper edge of the two protrusions 13 when the magnetic material 2 is fitted into the storage part 11.

  When the magnetic material 2 is fitted into the accommodating portion 11, the magnetic material 2 comes into contact with the upper edge of the two protrusions 13. Therefore, when the stator 4 and the rotor are turned on, the stator 4 Acts on the magnetic material 2 in the rotor to generate a magnetic field to rotate the motor, and the magnetic field exhibits a trapezoidal waveform as shown in FIG.

  Further, according to the trapezoidal waveform magnetic field, even when the volume and the rated voltage are the same, the starting torque and the instantaneous torque are increased, so that it can be applied to an electric forklift or a high-load electric transportation bus.

  The above embodiments are examples for explaining the present invention and are not intended to limit the scope of claims of the present invention. For example, changes in numerical values, replacement of motors or generators, machinery All replacements of parts having similar effects such as a pinching action are within the scope of the claims of the present invention.

It is a side view which shows the structure of the rotor by 1st Example of this invention. It is a side view which shows a part of structure of the rotor by 1st Example of this invention. It is a figure which shows the relationship between the voltage of the structure of the rotor by 1st Example of this invention, and time. It is the schematic which shows the structure of the rotor by the 1st Example of this invention, and the relationship between a stator. It is a side view which shows a part of structure of the rotor by the 2nd Example of this invention. It is a figure which shows the relationship between the voltage of the structure of the rotor by 2nd Example of this invention, and time. It is a side view of the conventional diatom steel plate. It is the schematic which shows the relationship between the conventional diatom steel plate and a stator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Silicon steel plate, 2 Magnetic material, 4 Stator, 11 Housing | casing part, 12 Indentation part, 13 Protrusion part, 14 Through-hole, 111 Bottom face, 112 opening, 113 Side surface, H clearance

Claims (4)

  A large number of silicon steel plates are stacked, and the periphery of each silicon steel plate is provided with a large number of accommodating portions for accommodating magnetic materials that are equidistant and exhibit depressions, and the accommodating portion has a bottom surface and an opening. The accommodating portion has a form of shrinking upward from the bottom surface, the bottom surface and the opening are continuous on two side surfaces, and a protrusion projecting in the opening direction is provided on the bottom surface of the accommodating portion, and the magnetic material A motor having a sinusoidal magnetic field generated by acting with a stator when the magnetic material contacts the upper edge of the projecting portion and rotates with electricity when the housing portion is fitted. The structure of the rotor.   The structure of the motor rotor according to claim 1, wherein the magnetic material is a permanent magnet.   The structure of the motor rotor according to claim 1, wherein a recess is formed at a location where the two side surfaces and the bottom surface of the housing portion are connected to each other.   A large number of silicon steel plates are stacked, and the periphery of each silicon steel plate is provided with a large number of accommodating portions for accommodating magnetic materials that are equidistant and exhibit depressions, and the accommodating portion has a bottom surface and an opening. The accommodating portion is configured to shrink upward from the bottom surface, the bottom surface and the opening are continuous on two side surfaces, and the bottom surface of the accommodating portion is provided with two protrusions projecting in the opening direction, and a magnetic material is provided. When the magnetic material is fitted into the housing portion, the magnetic material comes into contact with the upper edge of the two protrusions, and when turning on electricity, it acts with a stator to generate a trapezoidal magnetic field. The structure of the motor rotor.

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