Textiles: spinning – twisting – and twining – Apparatus and processes – Driving
Reexamination Certificate
2001-09-14
2002-05-28
Worrell, Danny (Department: 3765)
Textiles: spinning, twisting, and twining
Apparatus and processes
Driving
Reexamination Certificate
active
06393816
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the spindle direct motor drive system of a spinning machine such as ring spinning machine, ring twister machine, and double twister machine.
2. Prior Art
FIG.
1
and
FIG. 2
show respectively the examples of the first system and the second system of a plurality of individual motors for driving individually and directly a plurality of spindles which are arranged on spindle rails installed in the full length of spinning machine, the wiring system and the peripheral system. In general, the power source voltage of the spinning machine which consumes about 30~50 kVA is mainly the alternating 400V class.
FIG. 1
or the first system is the one that all of the individual motors
3
are drove by a large capacious inverter
72
, and after the alternating current voltage of power source
6
is converted to the direct current voltage by the voltage converter
7
l,the alternating current power is supplied from the inverter
72
to the individual motors
3
, through the power supply lines
4
, the power supply line branches
4
b
of the each individual motors
3
and switches
102
of which the movements are synchronized with the braking devices
101
.
FIG. 2
or the second system is the one that every individual motor
3
or every several individual motors
3
is controlled by each control mean (invertor in case of this example)
8
, and is the one that after the alternating current voltage of power source
6
is converted to the direct current voltage by the voltage converter
71
, the direct current power is supplied to every inverter
8
through the power supply lines
4
and the power supply line branches
4
b
and is converted to the alternating current voltage again by each inverter
8
and the alternating current power is supplied from each inverter
8
to every individual motor
3
through the connecting wires
4
c.
Moreover, the signal line
5
is connected with invertor
8
by the signal line branch
5
b,
and The stop switch
103
is the one to instruct each invertor
8
to stop or start the spindle
2
individually.
In any of the first system and the second system, because that one phase of the alternating current power supply
6
is usually grounded and in addition the voltage converter
71
is not an insulation type, the individual motors
3
should have the characteristic to be proof against the voltage and the insulation characteristic which corresponds to the power supply voltage against the earth.
FIGS. 3-7
show the conventional technologies.
FIG. 3
shows the conventional exempla of the individual motor
3
's structure. The stator
3
a
comprises the stator core
3
a
1
made of the silicon steel board and the electric winding wire
3
a
2
and the stator
3
a
is supported by the mean that the metallic housing
3
c
engages the edge of the stator core
3
a
1
's outer part. The metallic housing
3
c
is molded as one body with the holder
3
d
of the spindle's bolster
2
a
into which the bolster
2
a
is pressed and fit. On the other hand, the rotor
3
b
into which the spindle rotating part
2
b
is pressed and fit rotates at high speed inside of stator
3
a.
The individual motor
3
should have the characteristic to be proof against the voltage which corresponds to the power source voltage against the earth. And because the metallic housing
3
c
of the individual motor
3
is connected with the frame of the machine electrically, only the insulator of the stator winding wire
3
a
2
should have the characteristic to be proof against the voltage. By any chance if the insulation of this stator winding wire
3
a
2
is destroyed and if the earth resistance is large or the frame of the machine is imperfectly grounded, it is very dangerous because the power supply voltage appears on the metallic housing
3
c
of individual motor
3
which person's hand can touch easily. Because of the restriction that it is necessary to secure the insulating distance to be proof against the voltage, it is not easy to install compactly the switch
102
of
FIG. 1
, the inverter
8
, the stop switch
103
of FIG.
2
and etc. on the metallic housing
3
c.
FIG. 4
shows a conventional example of the wiring system of the first system and electric power supply lines or naked bars,
41
,
42
, and
43
which are arranged and partially embedded in the wiring duct
161
made of the insulation resin, being the distance apart from each other (in this case, surface distance) for insulating according to the power supply voltage.
FIG. 5
shows a conventional structure example of individual motors
3
, the wiring system and the peripheral system of the second system and power supply lines
41
and
42
which supply the direct current power and signal lines
51
are arranged in the wiring duct
161
being the distance apart from each other for insulating according to the power supply voltage, and they are installed under the spindle rail
1
. Invertor
8
, stop switch
103
, control materials
104
and the wiring of power supply line branches
4
b,
signal line branches
5
b
and connected wires
4
c,
etc. are arranged in housing
17
, and they are installed for each spindle as covering the individual motor
3
, the lower side of spindle
2
, the spindle rail
1
and the wiring duct
16
.
In the wiring system of
FIG. 4
, and the wiring system and the peripheral system of
FIG. 5
, power supply lines
4
of the machine of the alternating current power source 400V class should be the electric wires with the corresponding diameter or thickness, also including the peripheral system, they should be surely the distance apart from each other for insulating according to the voltage. In addition, they should have the safety structure that person's hand does not touch easily and the sealing up structure that the rubbish of a minute fiber which floats in the air does not invade. For such a reason, the size of the wiring system and the peripheral system are considerably large and their structure become complex. A large space is necessary to install them inside of the machine, and then it's not easy to install them anywhere inside of the machine.
FIG. 6
shows a conventional example of the signal transmission system that is necessary in the individual motor
3
, the wiring system and the peripheral system of the second system. There are speed set value signal, drive/stop signal, brake signal, motor restrain signal and so on as control signals sent to the inverter
8
from the controller
11
that controls the machine entirely and there are error signal, error type indicate signal and so on as a status signals sent to the controller
11
from the inverter
8
. In the spinning machine of which total length reaches to as many as 20-40 m, it is not practical to transmit the control signal and the status signal as parallel and digital signals even on the mounting side and the cost side because quite a lot of wiring are needed.
FIG. 6
is the example of the local network (LAN) system that processes these signals as the serial communications between multi bureaus.
FIG. 7
shows a main circuit composition of each bureau in the LAN system. In this LAN system, the coaxial cable of exclusive use or the twisted pair lines are used as a transmission medium and in each bureau
9
(each invertor
8
is included) and the relay circuits
12
, the special driving/receiving circuit
9
d
for transmission are used which can drive about
100
bureaus, so the LAN system is the general purpose and highly developed serial communication system which can transmit the signal in both directions to over several hundred meters distantly.
In serial communication system (LAN) between multi bureaus showing in FIG.
6
and
FIG. 7
, each composition element has generality based on each role. For the use as the spindle direct motor drive system of the spinning machine in which a small amount of data are transmitted in both directions between 500-1000 inverters
8
that are arranged in right and left side of the machine and the c
Eckert Seamans Cherin & Mellott , LLC
Silverman Arnold B.
Worrell Danny
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