Spindle motor with a special contact arrangement

Details Spindle motor with a special contact arrangement Spindle motor with a special contact arrangement

2000-06-30

2001-11-13

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S06700R, C310S091000, C360S099080

Reexamination Certificate

active

06316855

ABSTRACT:

The invention relates to a spindle motor with a contact arrangement as described in the preamble of claim
1
. Such spindle motors are used for example for driving hard disks.
There have been spindle motors for driving hard disks with a stationary base flange carrying a central spindle. In addition, a hub is provided which is pivotably mounted on the spindle by means of suitable bearings and on which at least one hard disk is arranged. On its inner circumference, the hub is provided with a magnetic yoke with a permanent magnet with a winding assembly located opposite to it which is attached to the base flange by means of a winding support. The electric connection with the winding assembly is established by means of a terminal fitting equipped with terminal lugs. This terminal fitting is attached at the bottom of the base flange and has a projecting part which fits into a recess provided on the base flange. The projecting part of the terminal fitting in turn is provided with a recess through which the leads coming from the winding assembly are guided and which are then connected to the terminal lugs by means of winding or soldering.
The disadvantage of the previous way of contacting consists in the fact that the spindle motor must have been assembled completely before the leads are connected. Only then is it possible to guide the leads manually through the recesses provided on the terminal fitting and to connect them to the terminal lugs.
Another disadvantage is the fact that the recesses through which the leads are guided must be provided with a dustproof and insulating seal by applying a sealing material after bonding.
Moreover, it is disadvantageous that it is impossible to coat the winding assembly with the insulating material before connecting the leads, as the leads must remain uncoated until bonding is performed.
In order to handle the disadvantages the object of the present invention is to develop a spindle motor with a contact arrangement of the initially mentioned type in such a way that rapid and simple contacting is enabled, the winding assembly can be coated before bonding, and the contacting area can be insulated and sealed appropriately.
According to the invention, this problem is solved due to the characteristics as described in claim
1
.
The invention is characterized by contact pins being provided in/on the winding support, to the free ends of which the leads of the winding assembly can be connected and the other ends of which project from the recess on the base flange and can be connected to the terminal lugs with the terminal fitting being attached.
This has the advantage that the leads of the winding assembly can be bonded with the contact pins before the spindle motor is finally assembled. Furthermore, the winding assembly already connected to the contact pins may be coated completely without impairing or making subsequent bonding with the terminal lugs difficult.
Another advantage consists in the fact that the leads may be bonded with the respective contact pins fully mechanically. In so doing, the leads are wound around the contact pins mechanically in a first step, and these points of contact may then be bonded in a second step by means of mechanical soldering.
In a first embodiment, the contact pins are arranged within, that is in the area between the winding assembly and the spindle.
In another embodiment, the contact pins are arranged outside, that is radially outside the winding assembly. For this purpose, the winding support is provided with a support located outside which is arranged between the rotor magnet of the hub and the base flange.
More advantageous features and embodiments are objects of the dependent claims.


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