Motor case for miniature motors
A motor and casing technology, which is applied in the field of motor casings of small motors, can solve the problems of reducing the positioning accuracy of the motor casing cover 3, reducing the performance of the motor, and increasing manufacturing costs, so as to reduce coating residues and burrs and improve the size Accuracy and production cost reduction effects
Inactive Publication Date: 2003-03-26
MABUCHI MOTOR
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Problems solved by technology
[0011] If burrs and other residues are produced due to the above-mentioned deep drawing process, all or part of them may peel off and enter the interior of the small motor, thereby causing malfunction of rotation, lowering the positioning of the motor housing cover 3 shown in Figs. 1 and 2 Accuracy and reduction in motor performance
[0012] Removing these burrs and other residues after the motor housing 1 is made would involve cumbersome manual operations which would increase manufacturing costs
[0013] The use of carbon steel sheet as the material of the motor housing 1 can prevent plating residues during deep drawing, but still produces a certain amount of burrs
In addition, the use of carbon steel plates requires electroplating and anti-corrosion measures for steel material storage after fabrication, which also leads to an increase in the overall cost compared to the use of plated steel plates
Method used
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[0032] Figure 5 is a perspective view of an embodiment of the present invention. Like parts are denoted by like reference numerals in FIG. 2 . exist Figure 5 In, reference numeral 15 denotes an inclined surface which is formed at an acute angle 1a near the boundary between the shoulder portion 12 and the case main body 1b in such a manner that the wall thickness of the motor case 1 is from Its open end tapers toward its interior.
[0033] Figure 6 is showing Figure 5 A longitudinal sectional view of the area in the vicinity of the middle shoulder portion 12 and the inclined surface 15. exist Figure 6 Among them, the symbol θ represents the oblique angle of the inclined surface 15 relative to the axis, and the symbol b represents the width of the shoulder portion 12 perpendicular to the axis direction. exist Figure 6 Among them, the inclination angle θ is preferably 2°~15°. A slope angle θ of more than 15° is undesirable because it would increase the Figure 5 The d...
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Abstract
A motor case for small-sized motor, which is formed during deep drawing a thin armor plate to a bottomed hollow cylinder, the cross-section contour involves at least one set of parallel straight lines and having sharp corners, and at the open end having a stepped part for orientation of the motor case cover and fixing, thereinto, the thickness of the corner la near the boundary between a stepped part 12 and a body part 1b is formed smaller than that of the corner la of the body part lb. Or the roundness of 0.1 to 0.2mm radius is formed at the inner periphery end of the boundary between the stepped part and the body part.
Description
technical field [0001] The present invention relates to a motor housing for a small motor on a small rotating machine (such as an electric ladder knife). Electroplated or carbon steel sheet deep-drawn into a hollow bottomed cylinder whose cross-section includes at least one pair of parallel lines and has an acute angle, and has at its open end a and shoulder sections that are held in place. Background technique [0002] Fig. 1 is a longitudinal sectional view showing an example of a small electric motor to which the present invention is applied. In Fig. 1, reference numeral 1 represents a hollow bottomed cylindrical motor housing made of metal material (such as low carbon steel), and an arc-shaped motor housing is firmly fitted on the inner peripheral surface of the housing. The block-shaped permanent magnets 2 form the stator. Reference numeral 3 denotes a motor case cover made of thermoplastic material or a combination of thermoplastic material and metal material in suc...
Claims
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IPC IPC(8): H02K5/04B21D22/26H02K15/12H02K15/14
Inventor 渡辺勤松本惠司工藤晃目黑贤次
Owner MABUCHI MOTOR