Electric motor and method of producing electric motor
A technology of an electric motor and a manufacturing method, which is applied to electric components, electromechanical devices, electrical components, etc., can solve the problems of poor workability, larger opening area, poor waterproofness, etc., so as to improve waterproofness and ensure ventilation area. , the effect of adequate ventilation area
Inactive Publication Date: 2008-05-14
MITSUBA CORP
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Problems solved by technology
[0005] But, as above-mentioned existing invention, the upper and lower long sides of the ventilation hole are formed in a staggered shape to present a shelter structure. When the ventilation hole is viewed from the front, there are actually long holes with openings, and the long holes are staggered from inside to outside. As a result, not only the water resistance is still not good, but also cutting chips are generated in order to form the vent hole, and two processes of punching the long hole and forming the upper and lower long sides are required. There is a problem of poor workability in the stamping process, which is exactly the problem to be solved by the present invention
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Embodiment Construction
[0028] Embodiments of the present invention will be described below based on the drawings. In the figure, reference numeral 1 is an electric motor for a radiator fan, and the electric motor 1 is composed of the following components: a yoke 2, which is made into a cylindrical shape with a bottom to be described later; an end frame 3, which is 3 to block the opening of the yoke 2; the armature mandrel 5, which is freely rotatably pivotally supported between the yoke barrel bottom 2a and the end frame 3 via the bearings 4, 4a; the armature core 6, which is 6 is fixed on the armature core shaft 5; the coil 7 is wound on the armature core 6; the permanent magnet 8 is fixed on the inner side of the yoke peripheral surface 2b; and the commutator 9 , Brushes 10 and other components. These structures are all existing structures.
[0029] In the yoke bottom portion 2a, a plurality of vent holes 11 according to the present invention are scattered and formed in the axial circumferential...
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In a fan motor (1) for a vehicle, an opening of an airflow hole (11) in a tubular bottom section (2a) of a yoke (2) that forms the fan motor (1) is formed so as not to be visible in a front view of the airflow hole (11). The airflow hole (11) is segmented to an upper half (12) and a lower half (13) by a laterally long segmentation line (X) having a mountain-like shape whose center part in its left-right direction enters into the upper half (12) side. The upper half (12) is formed in a spherical shape and protrudes outward from a bottom surface as it nears the lower side. As a result, the upper and lower halves (12, 13) are shifted from each other inward and outward.
Description
technical field [0001] The present invention belongs to the technical field of electric motors such as electric motors for radiator fans. Background technique [0002] Generally speaking, among such electric motors, there is an electric motor in which a vent hole for improving the cooling effect is opened on the bottom of a bottomed cylindrical yoke, but the vent hole is formed by punching such as punching. In the case of a simple opening, there is a problem that water such as rainwater enters the inside of the motor through the opening. [0003] As a countermeasure for this improvement, there is an invention in which the vent hole is formed as a long hole long in the left-right direction, and the upper long side protrudes outside the case and the lower long side sinks into the case. The internal and external staggered structure on the inside prevents water from entering from the outside by using the upper long side as a shelter shape (refer to Patent Document 1). [0004]...
Claims
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IPC IPC(8): H02K5/20H02K5/10
CPCH02K5/20H02K5/10Y10T29/49009H02K5/207
Inventor 细井启一横尾次男岩田正人
Owner MITSUBA CORP