Rotor assembly of brushless direct current motor

Details Rotor assembly of brushless direct current motor Rotor assembly of brushless direct current motor

2001-02-14

2002-10-08

Ramirez, Nestor (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S156320, C310S066000

Reexamination Certificate

active

06462441

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rotor assembly of a brushless direct. current motor, wherein the rotor can be conveniently assembled and fixed.
2. Description of the Related Prior Art
A conventional brushless direct current motor of axial winding radial air gap in accordance with the prior art shown in
FIG. 6
comprises a metallic axle tube
91
combined on a housing
90
. The metallic axle tube
91
has an outer diameter combined with a circuit board
92
, a coil
93
, and pole plates
94
. The metallic axle tube
91
has an inner diameter for combination with an oil-impregnated bearing
95
or a positioning bushing and a ball bearing, and a rotor has a magnet ring
96
to induce with the coil
93
to rotate.
During assembly of the conventional brushless direct current motor, it takes a lot of time to assemble the metallic axle tube
91
with the circuit board
92
, the coil
93
, the pole plates
94
, and the oil-impregnated bearing
95
. In addition, it needs a proper tightness between the metallic axle tube
91
and the circuit board
92
, the coil
93
, the pole plates
94
, and the oil-impregnated bearing
95
, thereby causing inconvenience in fabrication and assembly.
SUMMARY OF THE INVENTION
The objective of the present invention is to provide a rotor assembly of a brushless direct current motor, wherein the rotor can be conveniently assembled so that the brushless direct current motor can be manufactured and assembled more easily.
The present invention essentially includes a body provided with a circuit board, a pole plate, a coil, and a shaft base. The shaft base is provided with a positioning hole having a threaded portion by which a fixing member can be combined with a rotor. The rotor is provided with a countersunk seat in which a bearing is placed. The bearing has an axial hole for allowing passage of the fixing member so as to fix it. The rotor takes the fixing member as a center so as to rotate by a permanent magnet inducing with the coil.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.


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