Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2003-07-21
2004-10-19
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S06800R, C310S06800R, C310S071000, C310S179000, C310S180000
Reexamination Certificate
active
06806598
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a double-phase half-wave brushless dc motor having two sensor/drive members. More particularly, the present invention is related to using two sensor/drive members to control a double-phase half-wave coil assembly of the brushless dc motor.
2. Description of the Related Art
Referring initially to
FIG. 1
, it illustrates a schematic circuitry of a conventional double-phase half-wave brushless dc motor. The double-phase half-wave brushless dc motor has a drive circuit
10
for driving a double-phase half-wave coil assembly. The drive circuit
10
includes a sensor/drive member
11
and two coils
12
. The sensor/drive member
11
has two pins O
1
and O
2
for electrical connection, thereby connecting to the two coils
12
. In function, the sensor/drive member
11
is applied to alternatively turning on or off for controlling the coil
12
. Thereby, the sensor/drive member
11
is in control of conducting or cutting off the coil
12
. Consequently, the two excited coils
12
are capable of rotating a motor rotor.
However, the rated power characteristic of the sensor/drive member
11
is changed nonlinear with respect to its dimensions. In other words, if the rated power of the sensor/drive member
11
is doubled, the dimensions have an increase of more than double. Thus, the increase of the rated power of the sensor/drive member
11
must result in an extra-occupation in an inner space of the motor.
Moreover, a large rated power of the sensor/drive member
11
must result in an increase of manufacturing cost. That is, the manufacturing cost of a double rated power of the sensor/drive member
11
must be more expensive than that of two regular rated power of the sensor/drive member
11
.
In order to save the inner space and to reduce manufacturing cost of the motor, an additional sensor/drive member is added into the motor. Consequently, the motor accomplishes a double increase in rated power and a reduction in manufacturing cost.
The present invention intends to provide a double-phase half-wave brushless dc motor having two sensor/drive members for controlling a double-phase half-wave coil assembly, each of the sensor/drive members provided with a small rated power. Due to the small dimensions and the low manufacturing cost, the small rated power of the sensor/drive members substitute for a large rated power of the sensor/drive member that may enhance the rated power, minimize the dimensions and reduce the manufacturing cost. In manufacture, maximum number of the sensor/drive members of the motor is equal to or less than number of poles.
SUMMARY OF THE INVENTION
The primary objective of this invention is to provide a double-phase half-wave brushless dc motor having two sensor/drive members, each of which has small rated power adapted to control a double-phase half-wave coil assembly. Thereby, the two sensor/drive members may enhance the rated power of the double-phase half-wave brushless dc motor.
The secondary objective of this invention is to provide the double-phase half-wave brushless dc motor having two sensor/drive members, which have small dimensions and low manufacturing cost. Thereby, the two sensor/drive members may minimum the dimensions and lower the manufacturing cost of the double-phase half-wave brushless dc motor.
The double-phase half-wave brushless dc motor in accordance with the present invention includes a first sensor/drive member, a second sensor/drive member, a first motor coil and a second motor coil. Each of the sensor/drive members has two pins for electrical connection. Each of the motor coils is consisted of a first terminal and a second terminal for electrical connection. The first terminals of the first and second motor coils are commonly connected to a power source. The second terminal of the first motor coil is connected to one of the pins of the first sensor/drive member and one of the pins of the second sensor/drive member in common. And, the second terminal of the second motor coil is connected to the other pin of the first sensor/drive member and the other pin of the second sensor/drive member in common.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description and the accompanying drawings.
REFERENCES:
patent: 4800307 (1989-01-01), Papst
patent: 5731645 (1998-03-01), Clifton
patent: 5821674 (1998-10-01), Weiner
patent: 5828147 (1998-10-01), Best
patent: 6727613 (2004-04-01), Kawakami et al.
Hong Ching-Sheng
Horng Alex
Ko Ta-Lun
Bacon & Thomas PLLC
Dougherty Thomas M.
Mohandesi Iraj A.
Sunonwealth Electric Machine Industry Co. Ltd.
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