Locating structure for silicon sheet of motor locator

Details Locating structure for silicon sheet of motor locator Locating structure for silicon sheet of motor locator

2002-07-18

2003-04-22

Ramirez, Nestor (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S06800R, C310S049540

Reexamination Certificate

active

06552458

ABSTRACT:

BACKGROUND OF THE INVENTION
A present invention is related to an improved locating structure for a silicon sheet of a motor locator. The locating structure is able to truly locate the silicon sheet and aim the silicon sheet at a chip sensing point of a sensing switch.
FIGS. 4 and 5
show a conventional wiperless DC motor. The motor includes a base board
81
formed with a central fixing hole
82
. A bush
86
of a locator
85
is fixedly fitted in the fixing hole
82
. A silicon sheet
84
is inlaid in each of the top and bottom faces of the locator
85
. Each silicon sheet
84
has several pole sections
841
. The locator
85
has several downward extending fixing rods
851
. The base board
81
has a sensing switch
83
having a chip sensing point
831
. The base board
81
has several fixing holes
811
respectively corresponding to the fixing rods
851
. The fixing rods
851
are inserted in the fixing holes
811
for locating the locator
85
. When located, the edge of one of the pole sections
841
of the silicon sheet
84
is aimed at the chip sensing point
831
of the sensing switch
83
. The shaft
871
of a rotor
87
is disposed in the bush
86
of the locator
85
. The rotor
87
has an annular permanent magnet
88
fitted around the locator
85
. The coil in the locator
85
is controlled by the sensing switch
83
to create magnetic force of different polarities at the pole sections
841
of the silicon sheet
84
. Accordingly, the permanent magnet
88
is driven to rotate the rotor
87
for driving a fan (not shown).
In the above structure, the fixing rods
851
are integrally formed in integral injection molding of the locator
85
. The cross-section of the fixing rod
851
has small area so that when demolded, the fixing rods
851
tend to bend and deform. As a result, when using the fixing rods
851
to fix the locator
85
, the fixing rods
851
are often deflected so that the pole sections
841
of the silicon sheet
84
can be hardly accurately aimed at the chip sensing point
831
of the sensing switch
83
. In more serious case, the rotor
87
may be unable to rotate.
Moreover, the fixing rods
851
are integrally formed with the locator
85
. Therefore, when the fixing rods
851
are inserted in the fixing holes
811
, it is the locator
85
which is directly located, not the silicon sheet
84
. In other words, the silicon sheet
84
is indirectly located by the fixing rods
851
. Such locating measure tends to cause error of position where the silicon sheet
84
is inlaid in the locator
85
. As a result, the silicon sheet
84
can be hardly truly located. In serious case, the rotor
87
may be also unable to rotate.
The sensing switch
83
through the chip sensing point
831
senses the variation of magnetic force of the pole sections
841
of the silicon sheet
84
so as to control turning on/off of the coil in the locator
85
. Accordingly, the pole sections
841
of the silicon sheet
84
can create magnetic force of different polarities to drive the rotor
87
for driving the fan. Therefore, it is critical to accurately aim the pole sections of the silicon sheet at the chip sensing point of the sensing switch.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide an improved locating structure for silicon sheet of motor locator. The silicon sheet has a group of integrally projecting locating blocks radially opposite to each other. The base board is formed with locating holes respectively corresponding to the locating blocks. When a border of one pole section of the silicon sheet is aimed at the chip sensing point of the sensing switch, the locating blocks are inserted in the locating holes to truly locate the silicon sheet.
The present invention can be best understood through the following description and accompanying drawings wherein:


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