Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2002-12-20
2003-09-09
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
Reexamination Certificate
active
06617728
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention is related to a motor synchronous excitation brake, and more particularly, to one that shortens the braking time and promotes braking accuracy.
(b) Description of the Prior Art
Whereas, a motor of the prior art when the power supplied to it is interrupted, will continue to operate due to inertia. Therefore, a brake is usually adapted to the shaft of the motor to stop the motor when the power is interrupted. However, as a diverter is only used to synchronously apply the braking by the brake when the motor stops, drawbacks including inconsistent braking force, malfunction and longer braking time required, and the risks of motor safety in serious cases.
To overcome those problems, an improvement (Utility Pat. No. 186017 titled “Synchronous Excitation Motor Brake”) made by this inventor as illustrated in
FIG. 1
of the accompanying drawings, a rotor
15
adapted with a shaft
16
is penetrated through a casing
10
provided with an excitation coil
11
for the motor. An end cap
12
is each provided at both ends of the casing
10
to support the shaft
16
of the rotor
15
using bearings. When the motor is conducted, the shaft
16
starts to rotate as driven by the rotor
15
through the excitation coil
11
. A brake
20
is provided between the rotor
15
and the end cap
12
. A flange
17
formed with a series of wedge-shaped slots
18
is provided on the outer circumference of the rotor
15
while a braking disk
21
is provided by sliding on the shaft
16
and multiple wedges
22
corresponding to those wedge-shaped slots
18
from the flange
17
are provided on the outer circumference of the braking disk
21
. Meanwhile, a braking spring
23
is holding against at where between the braking disk
21
and the rotor
15
. Consequently, when the motor is excited, the braking disk
21
for being subject to the activated excitation coil
11
moves to the rotor
15
and rotates together with the shaft
16
. On the contrary, once the power supplied to the motor is interrupted, the braking disk
21
for no longer being subject to the excitation coil
11
moves towards both end caps
12
of the casing
11
due to the tension exercised by the braking spring
23
for the braking disk
21
to apply synchronous braking in relation to those braking shoes
13
provided on the end caps
12
.
The improvement does provide consistent braking force without those malfunctions as observed in the prior art, and faster braking. However, this inventor attempts a further improvement on upgrading the braking precision and shortening the braking time.
SUMMARY OF THE INVENTION
The primary purpose of the present invention is to provide a motor synchronous excitation brake with improved braking precision and operation safety of the motor.
Another purpose of the present invention is to provide a motor synchronous excitation brake with increased braking speed to shorten the braking time required.
The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.
Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
REFERENCES:
patent: 3579066 (1971-05-01), Bearfield et al.
patent: 4381048 (1983-04-01), Haverkamp et al.
patent: 5407400 (1995-04-01), Thomas et al.
patent: 6376948 (2002-04-01), Li-Yang
patent: 2 560 722 (1985-03-01), None
Dougherty Thomas M.
Hanh Nguyen
Lei Leong C.
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