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Small DC motor

A technology of DC motors and motor frames, applied in the direction of electric components, DC commutators, electrical components, etc., can solve the problems of large magnet thickness and achieve the effect of maintaining magnetism

Active Publication Date: 2006-11-29
MINEBEA MOTOR MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, in the small DC motor described in JP-A-07-059322, since even the four corners of the motor frame are filled with magnets, the thickness of the magnets is thicker than necessary for the actual driving performance

Method used

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  • Small DC motor
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1A to 1L show explanatory diagrams illustrating the features of the small-sized DC motor of the present invention while comparing with existing similar products.

[0042] 1A to 1D are diagrams showing the structure of a conventional general-purpose DC motor utilizing a ferrite magnet, wherein FIG. 1A is a diagram of one side when viewed in a direction indicated by an arrow a in FIG. 1C , and FIG. 1B is a transverse sectional view along line b-b in FIG. 1C , FIG. 1C is a sectional view along line c-c in FIG. 1B , and FIG. 1D is the other side when viewed in the direction indicated by arrow d in FIG. 1C diagram of .

[0043] In FIGS. 1A to 1D, a structure is employed in which two magnets 105 magnetized into N poles and S poles in the direction of rotation and each having an arcuate section are arranged along the length of a cylindrical motor frame 106. The side walls are arranged in axisymmetric manner, and a gap is arranged between the two magnets 105 .

[0044] In thi...

Embodiment 2

[0089] Next, the magnet and motor frame of the present invention will be described by comparing with the magnet and motor frame in the conventional example.

[0090] Figures 3A1 to 3E1 with Figures 3A2 to 3E2 Illustrative diagrams describing various embodiments of the invention are shown. Note that in Figures 3A1 to 3E1 with Figures 3A2 to 3E2 In , the figures with figure numbers suffixed with "1" are figures showing the end plates of the motor frame. In other words, they are diagrams showing the respective external shapes of the motor frame. The diagrams with figure numbers suffixed with "2" are diagrams showing respective sections of the motor frame.

[0091] exist Figure 3A1 with 3A2 Among them, when viewed in section, the motor frame 3a adopts a substantially circular shape, and the magnet 2a is formed in such a shape that secures the magnetic permeability of the magnet necessary for maintaining the performance of the motor, which suppresses the change of the m...

Embodiment 3

[0099] Figure 6A with 6B A cross-sectional view of a coreless motor to which the magnet structure of the present invention is applied is shown.

[0100] Figure 6A is along Figure 6B The profile of line n-n in , and Figure 6B is along Figure 6A Transversal profile of line m-m in . The small DC motor of the present invention includes the coreless motor 29 of the present invention.

[0101] The coreless motor 29 comprises an armature rotatably mounted in a motor frame 30 comprising a commutator die 37 , an armature winding forming element 38 and a shaft 7 .

[0102] The motor frame 30 of the coreless motor 29 includes a cylindrical portion 31 , an end plate portion 32 provided continuously with the cylindrical portion 31 , and a bearing housing portion 33 provided continuously with the end plate portion 32 . Inside the bearing seat portion 33 , the shaft 7 is rotatably supported by two bearings 34 , 35 separated from each other so as to be provided at upper and lower ...

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PUM

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Abstract

A small DC motor includes a motor frame having a cylindrical portion, the cylindrical portion having a constant thickness and having a cross section in a shape that comprises four sides and connecting portions, each of the connecting portions connecting adjacent two of the four sides and being located inward from a corresponding corner in a quadrangle comprising the four sides; and a magnet having a circumferential surface on an inside thereof and having conformable contact with the motor frame on an outside thereof.

Description

technical field [0001] The invention relates to a small DC motor with small size and easy installation. Background technique [0002] In DC motors used in laser printers, inkjet printers, and other electronic devices, there is a need to reduce motor size while maintaining motor performance. [0003] Therefore, in a state where the magnetic components of the rotating elements (the outer diameter of the armature core and the thickness of the laminations) that determine the performance of the motor are maintained by changing the shape of the magnetic components of the fixed components (magnets, motor frame), the motor’s The shape is made smaller. [0004] For a DC motor to be rotated, since the ratio of the number of magnetized poles (N: any positive number) to the number of slots (M: any positive number) is basically 2N:3M, the number of magnetized poles of the magnet is 2 poles, 4 pole, 6 pole, 8 pole, .... Generally, DC motors are formed in elliptical and cylindrical shap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K23/04H02K23/26H02K1/17H02K5/04
Inventor 黑田稔
Owner MINEBEA MOTOR MFG
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