Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-12-06
2001-10-09
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S063000, C310S089000, C482S054000
Reexamination Certificate
active
06300694
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cooling fan for electric treadmill motor, and more particularly, to a cooling fan which prevents the armature of the treadmill motor from being burnt down due to being overheated.
2. Description of the Prior Art
First of all, referring to
FIG. 2
, two induced-draft fans
14
,
16
are outwards disposed at two sides of a transmission shaft
12
the treadmill motor
10
respectively. When the treadmill motor
10
runs, the two induced-draft fans
14
,
16
simultaneously perform the air draft operation. Moreover, a turning wheel
17
is coupled at the most outward side of the transmission shaft
12
so that a treadmill running belt (not shown) can be driven by a transmission belt
18
.
Though this operation model seems reasonable and proper, the turning speed of the treadmill motor
10
is changeable in accordance with the user's operation so that the turning velocity varies tremendously (the adjustment range lies usually between at slowest 280 and at fastest 4800 revolutions) while the loading is kept at the same level (the weight of the user standing on the running belt of the treadmill). The two induced-draft fans
14
,
16
are activated by the operation of the treadmill motor
10
so that the air draft efficiency increases when the treadmill motor
10
runs more rapidly; therefore, an optimal cooling effect can be achieved at this case. However, the air draft efficiency decreases when the treadmill motor
10
runs less rapidly and the treadmill motor
10
can be therefore burnt down due to being overheated as the expected cooling effect can't reached.
Briefly, when the revolution velocity of the treadmill motor
10
becomes slow and the loading keeps unchanged (that is, the weight of the user keeps unchanged), the induced-draft fan can't create an expected cooling effect, so that the life of the treadmill motor
10
of the prior art is often shortened.
SUMMARY OF THE INVENTION
It is a main object of the present invention to provide a cooling fan for electric treadmill motor having an induced-draft fan of an independently running motor to perform a cooling operation while the air draft power is kept at a constant level no matter how fast the revolution velocity of the treadmill motor is, so that the life of the treadmill motor can be efficiently extended.
REFERENCES:
patent: 4759540 (1988-07-01), Yu et al.
patent: 4859888 (1989-08-01), Ohbayashi et al.
patent: 5102380 (1992-04-01), Jacobson et al.
patent: 5921893 (1999-07-01), Hurt
Wang Leao
Wu Peter
Kuo-Hsiung CHIU
Lam Thanh
Ramirez Nestor
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