magnetic field

[Don Kelly]

On 14/07/2014 3:40 PM, Dan Coby wrote:

On 7/14/2014 9:00 AM, DaveC wrote:
I need to provide jog function on a machine (run the motor for a few
seconds
under load) without use of VFD**. It was done on this small printing
press
with a 3 HP, 3-phase motor but the customer has no multiphase power so
Išm
changing to a 220 ³single phase² 5 HP motor.

Is there any inherent issue with starting an asynchronous motor under
load? A
3ph motor does this with ease, but can the same be said of an async
motor?
Should I be looking at a particular design of async motor?

Also, reversing an asynch motor‹is this a straightforward thing to do?
I'm
thinking about bringing the directional wiring inside the motor's
terminal
box out to separate contactors. I'm also thinking about
cross-connecting aux
contacts in the contactors to eliminate possibility of actuating both
simultaneously and some kind of timer relay to provide delay between
forward
and reverse actuation.

Any observations or experience youšd like to share would be greatly
appreciated.

Thanks!


** The customer has said ³absolutely no VFD². Apparently his business
neighbor has had nothing but troubles with VFDs (blowing the supply
fuses;
smoking at least one VFD) and he is terrified of them. Itšs an emotional
issue, not a logical one so no amount of discussion can change his mind.
Wešve tried.


Does your customer have any objection to a non-electronic converter? A
common means of running 3 phase motors from a single phase supply is via
the use of rotary phase converters.

http://en.wikipedia.org/wiki/Rotary_phase_converter


Dan

Such rotary phase converters have been commonly used in the past and can
be cobbled together from surplus equipment such as a 5-7.5HP 3 phase
motor driven by a single phase motor <1HP at an estimate.
I should think that this is the cheapest alternative.
It is bulky but it means that the original 3 phase 3HP potor can be
kept. Capacitors can help.

However, the sizing of the original motor is probably based on the load
current at start -and a HP rating to fit this and also fit an rms HP
limit equivalent. It may be that a 3HP single phase motor -capacitor
start designed for max torque near standstill would do the job as the
duty cycle is the same as before.
Check the specific info for the original motor and a replacement. The
single phase replacement will be expensive and there would likely be
mounting problems.
It's a bit of a toss up- mainly economics
--

Don Kelly
remove the cross to reply

 

On Mon, 14 Jul 2014 09:00:10 -0700, DaveC <invalid@invalid.net> wrote:

I need to provide jog function on a machine (run the motor for a few seconds
under load) without use of VFD**. It was done on this small printing press
with a 3 HP, 3-phase motor but the customer has no multiphase power so Išm
changing to a 220 łsingle phase˛ 5 HP motor.

The classical trick running an existing three phase motor from a
single phase supply is to connect capacitors between the three motor
terminals and then connect the single phase source between two of the
terminals.

Of course, the voltage is now lower, so less power is available.
Perhaps a autotransformer could be used to beef up the voltage. Having
intermediate taps in the autotransformer could be used to alter
starter or tongue performance.

 

[josephkk]

On Tue, 15 Jul 2014 21:48:50 -0700, DaveC <invalid@invalid.net> wrote:

However, in this case of a jog function- If a single phase capacitor
start single phase motor has the same starting torque as the 3 phase
motor (and with the right capacitor- this may well be done) a single
phase motor may well fit the needs-electrically-but likely not
mechanically with respect to mounting.

I (OP) am concerned about jogging. The single-phase motor will be using its
start winding, and the associated high current will heat the winding. Jogging
means usually repeated, sometimes back-and-forward direction changes, short
motor actuations.

With all this jogging the centrifugal start switch will be abused over time
which probably means early failure.

Two easy answers:
a. use a cap run motor
b. use a current sensing start switch

Also this will almost always be within the start time of the jogger motor.

?-)

 

[Ian Field]

"Pavel Svinchnik" <pintiha@jhmi.edu> wrote in message
news:f29c85c2-65e1-401a-947d-2332e168fed3@googlegroups.com...

I need some sort of device to equalize the volume of audio feed to my TV
but don't know what it's called or even if there is such a thing. I have a
fairly new flat screen TV which is fed by several devices; cable box,
BluRay, an old VHS/DVD player, and X-Box.

The problem is that for the BluRay, I have to turn the volume on the TV up
to 90 or above to hear it, while the cable box is deafening anywhere above
25. The problem is that if my wife has been watching something on the
BluRay and I turn on the TV to cable, it's horribly loud until I can hit
mute or turn down the sound. It seems that there should be something
available to buffer the inputs from the various devices and send the audio
signal to the TV at a consistent volume.

Maybe the cheapest option is to route everything through a compressor.

Basically a variable gain amplifier, the incoming audio is sampled to
produce a control voltage for the VGA.

 

On Wednesday, November 6, 2002 5:39:22 PM UTC-8, Robert Hawk wrote:

RATELCO Battery charger / Rectifier. Type FC481505A Model #
102B-3608-00. 48 Volt @ 150 Amps, Float or Equalize. These units were
manufactured SEPT 1991 and are in the Factory crates and have Never
been used, have 2, sequential Serial numbers. These units can be used
as 48 volt charger for Telephone Central Office Battery supply's with
the ability to Float or Equalize. They can also be used as a stand
alone, well filtered, power supply rated at 48 volts at 150 amps
CONTINOUS DUTY. Input = 110, 208, 240 Volts. 60 Hz, single phase A
must for the expirimenter working with the new generation of 48 volt
solid state RF devices Rated in excess of a Kilowatt. Weight is
approximately 550 pounds, Crated for freight shipping. $1500.xx
Prepaid, in my garage. Loading and shiping are buyers responsibility.

Pictures can be seen at

http://gnc.net/~rhawk/index.html

Bob

Bob , where are you located , and what is your current asking price . Boyd

 

Hey, you can use WP Profit Builder to create a new website only Drag and Drop. it launch at 16/09/2014. you can find more informations about it in video: https://www.youtube.com/watch?v=rEX7UDrZSvU

 

Hey, you can use WP Profit Builder to create a new website only Drag and Drop. it launch at 16/09/2014. you can find more informations about it in video:

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Hey, you can use WP Profit Builder to create a new website only Drag and Drop. it launch at 16/09/2014. you can find more informations about it in video:

https://www.youtube.com/watch?v=rEX7UDrZSvU

 

On Friday, October 17, 2014 1:57:54 PM UTC+1, DaveC wrote:

I have a 12V SPST cube relay in my junque box. The diagram molded into the
relayšs housing includes a component connected in parallel with the coil
which looks suspiciously like a resistor.

Itšs not a back-emf diode: I connected the relay coil using both polarities
(using a current-limited power supply) and the same current draw is measured.


What is the purpose of this resistor?

Thanks,
Dave

The resistor is there to dampen back emf. I've come across them in Hella/Bosch sales catalogues. Use with ecu if more normal damper diode is not already fitted/contained in ecu. An application is early fuel injection systems fitted to older Volkswagen Varient models.

 

I know this is a really old thread, I found one of the radios also. Is it still running? And how did the bulb replacement go? Also I have a loose wire that goes up to the doze button can't find what spot on the board it suppose to connect to. It is loose right under the fiber board. I think I see where it once was but not sure.


On Sunday, January 9, 2005 8:34:38 PM UTC-5, Bob Archambault wrote:

boba3@earthlink.net wrote:

I am in the process of repairing a 1970's clock radio:

Panasonic RC-7462

The radio plays perfectly, and I was able to repair the clock. All
that it needs now is to have the clock lamp replaced. This is a
strange lamp in that it is a tube which is 3 1/4" inches long and
5/16" in diameter, and is soldered direct to its wires (which are both
on one end of the tube). It appears to be a neon or fluorescent type of tube.
It is supplied with 230 volts AC to operate it. I have taken the following numbers
off of the tube (which I hope are correct, since these numbers are almost
microscopic, and I have MUCH trouble seeing them, but here goes...):

NL 60T8-B

Can some one please tell me:

A) What type of lamp this is? -and-

B) Where can I obtain a replacement?


All replies, with the exception of the smart-alecky "throw the POS away
and get a new radio" types, would be greatly appreciated!


OK, folks...

I just want to end this thread and let everyone know how I made out.
I used the green neon bulb from Radio Shack (# 272-708) and cut the
plastic housing away from the bulb with my Dremel tool. While it is
certainly not original, it works just fine and looks pretty good as well.

As far as the original bulb - the NL 60T8-B, I did some experimentation
and determined that it is absolutely a colored neon bulb that gives off
a light purplish-blue color. I found this out by using a microwave to exite
the phosphor coating, thereby letting it show its true colors <g>. My feelings
about the bulb number are pretty much:

NL = Neon Lamp
T8 = Tubular, 8mm diameter
B = Blue

Now as far as the "60" goes, I'm not really sure. Franc suggested the
possibility of it being the striking voltage. I tend to think not, as it would
seem that you wouldn't need 230 V to run a tube that only needs 60 V to
start. I don't think it's a wattage rating, as this certainly seems more powerful
than 60 mW, but is less than 6.0 W. I did notice that the phosphor coating
(which corresponds exactly to the lighted area) is precisely 60mm long,
so that's a possibility. But, again, I really don't know.

In any case, I want to thank all of you who contributed thoughts and
suggestions. I learned a little, and most importantly, repaired the
item satisfactorily.

A final thought - I am still not averse to restoring this to its original
condition, so if someone, at some later time, ambles across this
thread and has first-hand knowledge of where I might actually find
a good NL60T8-B, please e-mail me at:

boba3@earthlink.net


Thanks very much...

Bob Archambault

 

Hi Klaus,

einige Jahre vor, wollten wir einige EVG hestellen wollten,
Sind Sie noch im diese Geschäft tätig?

viele Grüsse
gustavo Blancarte

www.blantek.com.mx
MEXICO

 

On Saturday, September 27, 1997 5:00:00 PM UTC+10, le...@ack.wat.waw.pl wrote:

From: Adam Kawalec
E-Mail: lechs@wat.waw.pl


Hello,


I need Spice model for NE 592 chip. I'd be very grateful if anyone
could send it to me. Thank you in advance.

Adam Kawalec

* NE592 Video Amplifier
..subckt NE592 In1 In2 Out1 Out2 G1A G1B V+ V-
R1 V+ N002 2.4k
R2 V+ N005 2.4k
R3 V+ N009 1.1k
R4 V+ N012 1.1k
Q1 N009 N005 N010 0 NPN
Q2 N012 N002 N010 0 NPN
Q3 V+ N012 Out1 0 NPN
Q4 V+ N009 Out2 0 NPN
R5 Out1 N002 7k
R6 Out2 N005 7k
R7 V+ N001 10k
Q5 N002 In1 G1A 0 NPN
Q6 N005 In2 G1B 0 NPN
R8 G1B N006 50
R9 G1A N003 50
Q7 N003 N001 N004 0 NPN
Q8 N006 N001 N007 0 NPN
Q9 N001 N001 N008 0 NPN
Q10 N010 N001 N011 0 NPN
Q11 Out1 N001 N013 0 NPN
Q12 Out2 N001 N014 0 NPN
R10 N004 V- 600
R11 N007 V- 600
R12 N008 V- 1.4k
R13 N011 V- 300
R14 N013 V- 400
R15 N014 V- 400
..model NPN NPN(BF=125 Cje=.5p Cjc=.5p Rb=500)
..ends NE592

 

Sell:
China Shenzhen ZHAOWEI Machinery & Electronics Co. Ltd engages in designing, manufacturing and marketing all kinds of electric motors. They are mainly suitable for the following applications: smart home application used in smart kitchen and laundry, medical instrument for personal care, smart E-transmission applied in automobile, industry automation applied in telecommunication and a great variety of plastic/metal planetary gearbox in different sizes.
In order to develop the oversea market, we are current seeking new partners around the world to create a bright future together. ZhaoWei is a right choice and excellent partnership with sincere services.

Company: Shenzhen ZHAOWEI Machinery & Electronics Co., Ltd
URL: http://www.zwgearbox.com/
Contact: Anny Liu
Tel：+86-755-27322652
Fax：+86-755-27323949
E-mail:sales@zwgearbox.com
Add: Blk. 18, Longwangmiao Industry Park, Fuyong Tn., Bao’an Dist., Shenzhen 518103, Guangdong, China

 

在 2000年8月9日星期三 UTC+8下午3:00:00，t-st...@webtv.net写道：

hope you can help...

How can make my motor on my radio control car go faster than it is now?
the car is 27 MHz.

thank you in advance

please reply...
_t-s_

Sell:
China Shenzhen ZHAOWEI Machinery & Electronics Co. Ltd engages in designing, manufacturing and marketing all kinds of electric motors. They are mainly suitable for the following applications: smart home application used in smart kitchen and laundry, medical instrument for personal care, smart E-transmission applied in automobile, industry automation applied in telecommunication and a great variety of plastic/metal planetary gearbox in different sizes.
In order to develop the oversea market, we are current seeking new partners around the world to create a bright future together. ZhaoWei is a right choice and excellent partnership with sincere services.

Company: Shenzhen ZHAOWEI Machinery & Electronics Co., Ltd
URL: http://www.zwgearbox.com/
Contact: Anny Liu
Tel：+86-755-27322652
Fax：+86-755-27323949
E-mail:sales@zwgearbox.com
Add: Blk. 18, Longwangmiao Industry Park, Fuyong Tn., Bao’an Dist., Shenzhen 518103, Guangdong, China

 

在 1997年4月16日星期三 UTC+8下午3:00:00，Alex写道：

I have a Velleman K8000 interface board that can output an analog
output from 0-5V but cannot support the load of an electric motor.
How can I use that analog output to control the speed of the motor?
Can I use things like power transisors and Op Amps?

-Alex


******************************
* ayip@mindspring.com *
* http://www3.fa.org/yip *
* http://199.99.157.3/yip *
* 1973 Volvo 1800ES 120,000+ *
******************************

Sell:
China Shenzhen ZHAOWEI Machinery & Electronics Co. Ltd engages in designing, manufacturing and marketing all kinds of electric motors. They are mainly suitable for the following applications: smart home application used in smart kitchen and laundry, medical instrument for personal care, smart E-transmission applied in automobile, industry automation applied in telecommunication and a great variety of plastic/metal planetary gearbox in different sizes.
In order to develop the oversea market, we are current seeking new partners around the world to create a bright future together. ZhaoWei is a right choice and excellent partnership with sincere services.

Company: Shenzhen ZHAOWEI Machinery & Electronics Co., Ltd
URL: http://www.zwgearbox.com/
Contact: Anny Liu
Tel：+86-755-27322652
Fax：+86-755-27323949
E-mail:sales@zwgearbox.com
Add: Blk. 18, Longwangmiao Industry Park, Fuyong Tn., Bao’an Dist., Shenzhen 518103, Guangdong, China

 

Sell:
China Shenzhen ZHAOWEI Machinery & Electronics Co. Ltd engages in designing, manufacturing and marketing all kinds of electric motors. They are mainly suitable for the following applications: smart home application used in smart kitchen and laundry, medical instrument for personal care, smart E-transmission applied in automobile, industry automation applied in telecommunication and a great variety of plastic/metal planetary gearbox in different sizes.
In order to develop the oversea market, we are current seeking new partners around the world to create a bright future together. ZhaoWei is a right choice and excellent partnership with sincere services.

Company: Shenzhen ZHAOWEI Machinery & Electronics Co., Ltd
URL: http://www.zwgearbox.com/
Contact: Anny Liu
Tel：+86-755-27322652
Fax：+86-755-27323949
E-mail:sales@zwgearbox.com
Add: Blk. 18, Longwangmiao Industry Park, Fuyong Tn., Bao’an Dist., Shenzhen 518103, Guangdong, China

 

China Shenzhen ZHAOWEI Machinery & Electronics Co. Ltd engages in designing, manufacturing and marketing all kinds of electric motors. They are mainly suitable for the following applications: smart home application used in smart kitchen and laundry, medical instrument for personal care, smart E-transmission applied in automobile, industry automation applied in telecommunication and a great variety of plastic/metal planetary gearbox in different sizes.
In order to develop the oversea market, we are current seeking new partners around the world to create a bright future together. ZhaoWei is a right choice and excellent partnership with sincere services.

Company: Shenzhen ZHAOWEI Machinery & Electronics Co., Ltd
URL: http://www.zwgearbox.com/
Contact: Anny Liu
Tel：+86-755-27322652
Fax：+86-755-27323949
E-mail:sales@zwgearbox.com
Add: Blk. 18, Longwangmiao Industry Park, Fuyong Tn., Bao’an Dist., Shenzhen 518103, Guangdong, China

 

China Shenzhen ZHAOWEI Machinery & Electronics Co. Ltd engages in designing, manufacturing and marketing all kinds of electric motors. They are mainly suitable for the following applications: smart home application used in smart kitchen and laundry, medical instrument for personal care, smart E-transmission applied in automobile, industry automation applied in telecommunication and a great variety of plastic/metal planetary gearbox in different sizes.
In order to develop the oversea market, we are current seeking new partners around the world to create a bright future together. ZhaoWei is a right choice and excellent partnership with sincere services.

Company: Shenzhen ZHAOWEI Machinery & Electronics Co., Ltd
URL: http://www.zwgearbox.com/
Contact: Annie Liu
Tel：+86-755-27322652
Fax：+86-755-27323949
E-mail:sales@zwgearbox.com
Add: Blk. 18, Longwangmiao Industry Park, Fuyong Tn., Bao’an Dist., Shenzhen 518103, Guangdong, China

 

Il giorno venerdě 5 aprile 2002 08:10:10 UTC+2, Adrian Round ha scritto:

I am trying to locate the manufacturer of a small LCD display. It has
no controller chip and user elastomer connections (40). The part
number is F2025W-34. I need a replacement to fix a friends
stern-drive trim indicator.

Thanks,

Adrian Round

Hi Adrian,
Did you find it?

regards,
Nicola.

 

在 1998年3月16日星期一 UTC+8下午4:00:00，Paul Rampelbergh写道：

Hello,

Please, can somebody explain what is required to print(?) on a PCB:
- a solder mask;
- component location indications.

Jiangmen ABQ Electronic Material Co.,LTD was estimated in the year of 2006.

specialized in the production of high-end photoimageable PCB ink.

We passed the ISO9001 quality standard identification.and ISO14001.



Our Main products:

PISM white colour RS-2000 (W series)for LED ( patent products ),

PISM white colour matt for automative (we have TS16949 certificate , in Europe our RS-2000 WDM already be appointed to use in Automative industry,so there are a lot of PCB factory from china ,from korea ,from Thailand are buying RS-2000 WDM for their Europe automotive order).



Electronica spray ink RS-2000 SP(our electronica spray ink is sucessful in Korea market already)

PISM green colour RS-2000GL

PISM other colours RS-2000 BL,K,Y,R ,and others.

$UV cured solder mask UV-1000 G green colour

UV cured solder mask UV-1000 W white colour

Etching ink RS-1200,RS-1280,RS-8580

UV etching ink UV-680,UV 690.

Conduction current carbon ink RF-1860

Low pressure coating ink:RS-2000 BDHF

Marking ink.



All of our products are approved by UL ,(UL filenumber :E-310593).



Main customers in china :Founder technology ,Tiger builder ,Red board ,KB

,mankun and so on.



Due to we are setting up a new factory ,the total produce capacity will

reach 800tons per month.



In order to meet the new capacity we must develop oversea market largely

with very competitive price.



Our oversea market is developing very fast on the basis of our competitive

price ,stable quality ,excellent service.

Now our oversea market is :korea ,russia ,india ,parkistan,saudi,brazil

,usa,vietnam,turkey,Iran,malaysia and so on.



Consindering the cost ,now more and more PCB manufacturers choose china

mainland PCB ink supplier.



Now we are developing your market,so if we can get cooperation chance from

you then we will be very much appreciated.



Looking forward to hearing from you and best regards.



Mrs. Wang


****************************************************************

Export Manager

Jiangmen ABQ Electronic Material CO.,LTD

Facebook: https://www.facebook.com/abq.pcb.ink

Video: https://youtu.be/iZEE5h3H6Dg

Web: http://www.jmbq.com.cn

E-MAIL: abqink@hotmail.com | abqink@gmail.com

export@jmbq.com.cn

SKYPE: abqink@hotmail.com

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