Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2002-08-09
2003-12-09
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C482S054000
Reexamination Certificate
active
06661136
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an external rotor motor for a treadmill, and more particularly, to a motor with an external rotor whose inertia is increased such that it itself serves as flywheel.
2. Description of the Prior Art
As shown in
FIGS. 1 and 2
, the motor
20
of a conventional treadmill
10
is internal rotor type. The output shaft
22
coupled with the interior rotor
21
has to be provided with a heavy inertia flywheel
23
to drive a driven belt wheel
13
connected with a roller
12
of the walking belt
11
of the treadmill
10
through a driving belt wheel
24
and a transmission belt
25
. As a result, the walking belt
11
can perform an in-place rotation for the operator to make a walking or jogging exercise thereon. However, not only increases the inertia flywheel
23
of the conventional interior-rotor motor
20
processing and material cost, but also the dynamic balance thereof has to be treated separately from the interior-rotor motor
20
. Accordingly, the required precision is not easily achieved.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide an external rotor motor for a treadmill, and more particularly, to a motor with an external rotor whose inertia is increased such that it itself serves as flywheel. As a result, processing and material cost can be reduced and the treatment of the dynamic balance is performed only one time. Accordingly, the required precision is easily achieved.
REFERENCES:
patent: 4121127 (1978-10-01), Adelski et al.
patent: 5141479 (1992-08-01), Vanjani et al.
patent: 6160334 (2000-12-01), Teshima et al.
patent: 6455960 (2002-09-01), Trago et al.
Hanh Nguyen
Ramirez Nestor
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