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參數(shù)資料
| 型號： | 305C1 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | PTCR Motor Start Packages PSC Single Phase Motor Start Assist |
| 中文描述： | PTC熱敏陶瓷馬達(dá)啟動軟件包力晶單相電機(jī)起動輔助 |
| 文件頁數(shù)： | 2/6頁 |
| 文件大?。?/td> | 177K |
| 代理商： | 305C1 |
www.vishay.com
4
305C Series
Vishay Cera-Mite
ceramite.support@vishay.com
Document Number: 23086
Revision 14-May-02
The use of a PTCR start assist insures sufficient acceleration
torque to overcome not only breakaway friction, but also
parasitic asynchronous torques associated with the 5th and
7th motor harmonics or lamination slot harmonics.
ACCELERATION TIME CONSIDERATIONS
The time to accelerate a rotating machine is:
Accelerating Time (Seconds) =
(Avg. Torque = Curve B - Curve A)
RPM x WK
2
(lb ft
2
)
Avg. Torque (lb ft) x 308
1. If (Curve B - Curve A) is zero or less, the motor may stall.
2. In calculating torque available from Curve B, allowance
should be made for cusps in the torque curve due
to harmonics. The time needed to accelerate from rest
to 1/2 speed is critical, as the average torque available
in this region is limited. Select a PTCR with sufficient
switching time (t) to accelerate the compressor.
3. Scroll and rotary compressors may have less breakaway
torque than shown.
4. A compressor with no equalization may require over
100% starting torqe and time as long as several seconds.
PTCR starters not recommended.
CONSIDERATIONS FOR CURRENT IN PTCR
APPROXIMATE EQUIVALENT CIRCUIT PSC MOTOR AT ZERO SPEED
Fig T-4
Fig T-6
Simplified Voltage Diagram of the PSC Motor at Operating
Speed
*I
A
(auxiliary current) leads I
M
(main current)
by 80
°
to 90
°
when C (run capacitor) is
chosen for balanced operation at 3/4 to
full load. Line Power Factor = sine 2
θ
Fig T-5
PTCR Motor Start Packages
I
L
(run) =
HP x 746
I
L
(start)
≈
6 x
I
L
run
V
M
x pf x eff
For running conditions:
If V
aux
= V
M,
then
I
M
and
I
aux
=
If V
aux
≠
V
M
,
then
I
aux =
x and Z
aux =
I
L
√
2
I
L
V
M
V
M
√
2
V
aux
I
aux
For the greatest starting torque, PTCR should be chosen to make:
V
x
I
= V
x
I
. In many cases the auxiliary Volt-
Amperes are limited to about 50% of the main winding
Volt-Amperes to get 50% - 70% rated torque.
Then at start, with PTCR in series:
Z'
aux
= R
PTCR
+ Z
aux
I
R
start
through PTCR =
I
C start
through Run Cap = Xc
I
aux start
=
I
R start
+
I
C start
V
M
Z'
aux
V
1
2
π
fC
If Z
is low impedance, less than 10% of R
PTCR
then it can be ignored and
I
PTCR
at start = V
M
This closely approximates the condition for motors over 1/2 HP.
R
START AND ACCELERATION TORQUES
SINGLE PHASE PSC HIGH EFFICIENCY COMPRESSORS
100
75
50
25
0
5th
7th
Slot
P
100
200
A
2
A
1
B
1
B
2
Line Voltage V
M
I
aux
I
M
I
c
R
M *
X
M *
L
2
C
PTCR
X
aux
R
aux
*R and X are total of stator and rotor
V
aux
L
1
I
L
I
R
CURVE B2
Motor speed
versus torque
with run cap
and PTCR
CURVE B1
Motor speed
versus torque
with run cap
only
CURVE A2
Torque req
’
d to
accelerate
compressor at
partial differential
pressure
CURVE A1
Torque req
’
d
to accelerate
unloaded
compressor
Cold Breakaway Torque
Percent Rated Torque
Full Load
Operating Point
Possible Region of
Harmonic Torques
max.
Torque
V
A
θ
I
A
I
M
V
M
Applied
Voltage
V
PTCR
=V
C
=
I
A
C
θ
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 305C11 | PTCR Motor Start Packages PSC Single Phase Motor Start Assist |
| 305C19 | PTCR Motor Start Packages PSC Single Phase Motor Start Assist |
| 305C12 | PTCR Motor Start Packages PSC Single Phase Motor Start Assist |
| 305U | STANDARD RECOVERY DIODES |
| 306RPFB | 16-Channel CMOS Analog Multiplexer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 305C11 | 制造商:Vishay Intertechnologies 功能描述:PTCR MOTOR START A CASE |
| 305C12 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:PTCR Motor Start Packages PSC Single Phase Motor Start Assist |
| 305C19 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:PTCR Motor Start Packages PSC Single Phase Motor Start Assist |
| 305C2 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:PTCR Motor Start Packages PSC Single Phase Motor Start Assist |
| 305C20 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:PTCR Motor Start Packages PSC Single Phase Motor Start Assist |
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