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Medical devices and US 220V electrics

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  Medical devices and US 220V electrics RBlack <news@rblack01.plus.com> - 2017-05-25 13:05 +0100
    Re: Medical devices and US 220V electrics Winfield Hill <hill@rowland.harvard.edu> - 2017-05-25 05:55 -0700
    Re: Medical devices and US 220V electrics upsidedown@downunder.com - 2017-05-25 17:26 +0300
      Re: Medical devices and US 220V electrics Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-05-25 10:27 -0400
        Re: Medical devices and US 220V electrics George Herold <gherold@teachspin.com> - 2017-05-25 08:39 -0700
          Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-25 12:40 -0400
      Re: Medical devices and US 220V electrics Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-25 15:03 +0000
        Re: Medical devices and US 220V electrics upsidedown@downunder.com - 2017-05-25 20:09 +0300
      Re: Medical devices and US 220V electrics RBlack <news@rblack01.plus.com> - 2017-05-25 16:56 +0100
        Re: Medical devices and US 220V electrics Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-25 16:42 +0000
        Re: Medical devices and US 220V electrics upsidedown@downunder.com - 2017-05-25 20:38 +0300
        Re: Medical devices and US 220V electrics whit3rd <whit3rd@gmail.com> - 2017-05-25 10:48 -0700
        Re: Medical devices and US 220V electrics Neon John <no@never.com> - 2017-05-28 15:48 -0400
        Re: Medical devices and US 220V electrics rickman <gnuarm@gmail.com> - 2017-05-29 01:08 -0400
      Re: Medical devices and US 220V electrics Cursitor Doom <curd@notformail.com> - 2017-05-25 17:51 +0000
        Re: Medical devices and US 220V electrics upsidedown@downunder.com - 2017-05-25 21:25 +0300
      Re: Medical devices and US 220V electrics "Tom Del Rosso" <fizzbintuesday@that-google-mail-domain.com> - 2017-05-26 11:55 -0400
        Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-26 17:38 -0400
          Re: Medical devices and US 220V electrics "Tom Del Rosso" <fizzbintuesday@that-google-mail-domain.com> - 2017-05-26 20:32 -0400
            Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-26 22:20 -0400
              Re: Medical devices and US 220V electrics "Tom Del Rosso" <fizzbintuesday@that-google-mail-domain.com> - 2017-05-27 00:33 -0400
                Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-27 09:37 -0400
    Re: Medical devices and US 220V electrics legg <legg@nospam.magma.ca> - 2017-05-25 12:07 -0400
      Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-25 12:49 -0400
        Re: Medical devices and US 220V electrics Neon John <no@never.com> - 2017-05-28 15:56 -0400
          Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-28 16:59 -0400
        Re: Medical devices and US 220V electrics upsidedown@downunder.com - 2017-05-30 12:37 +0300
          Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-30 17:41 -0400
      Re: Medical devices and US 220V electrics gregz <zekor@comcast.net> - 2017-05-30 06:58 +0000
    Re: Medical devices and US 220V electrics rickman <gnuarm@gmail.com> - 2017-05-25 12:15 -0400
      Re: Medical devices and US 220V electrics Jon Elson <jmelson@wustl.edu> - 2017-05-25 15:07 -0500
        Re: Medical devices and US 220V electrics John Larkin <jjlarkin@highland_snip_technology.com> - 2017-05-25 13:14 -0700
          Re: Medical devices and US 220V electrics Jon Elson <jmelson@wustl.edu> - 2017-05-25 16:34 -0500
        Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-25 18:47 -0400
          Re: Medical devices and US 220V electrics Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> - 2017-05-27 01:46 +0200
            Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-26 19:53 -0400
              Re: Medical devices and US 220V electrics Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> - 2017-05-27 02:05 +0200
                Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-26 22:21 -0400
                  Re: Medical devices and US 220V electrics Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> - 2017-05-27 04:25 +0200
                    Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-26 22:33 -0400
                      Re: Medical devices and US 220V electrics Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> - 2017-05-27 21:48 +0200
    Re: Medical devices and US 220V electrics Don Y <blockedofcourse@foo.invalid> - 2017-05-25 11:20 -0700
    Re: Medical devices and US 220V electrics Jon Elson <jmelson@wustl.edu> - 2017-05-25 14:57 -0500
      Re: Medical devices and US 220V electrics RBlack <news@rblack01.plus.com> - 2017-05-26 12:17 +0100
        Re: Medical devices and US 220V electrics tabbypurr@gmail.com - 2017-05-26 04:53 -0700
        Re: Medical devices and US 220V electrics Phil Allison <pallison49@gmail.com> - 2017-05-26 06:00 -0700
        Re: Medical devices and US 220V electrics rickman <gnuarm@gmail.com> - 2017-05-26 12:05 -0400
        Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-26 17:51 -0400
          Re: Medical devices and US 220V electrics George Herold <gherold@teachspin.com> - 2017-05-26 17:54 -0700
            Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-26 22:24 -0400
        Re: Medical devices and US 220V electrics upsidedown@downunder.com - 2017-05-27 00:52 +0300
          Re: Medical devices and US 220V electrics Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-05-26 15:39 -0700
        Re: Medical devices and US 220V electrics Neon John <no@never.com> - 2017-05-28 16:34 -0400
          Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-28 17:26 -0400
            Re: Medical devices and US 220V electrics Neon John <no@never.com> - 2017-05-29 12:12 -0400
              Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-29 14:26 -0400
    Re: Medical devices and US 220V electrics Tim Wescott <tim@seemywebsite.really> - 2017-05-29 00:08 -0500
    Re: Medical devices and US 220V electrics David Lesher <wb8foz@panix.com> - 2017-05-29 20:24 +0000
      Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-29 16:37 -0400
        Re: Medical devices and US 220V electrics David Lesher <wb8foz@panix.com> - 2017-05-30 16:33 +0000
          Re: Medical devices and US 220V electrics Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-05-30 09:46 -0700
          Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-30 17:45 -0400
            Re: Medical devices and US 220V electrics David Lesher <wb8foz@panix.com> - 2017-05-31 03:31 +0000
              Re: Medical devices and US 220V electrics krw@notreal.com - 2017-05-31 17:58 -0400
                Re: Medical devices and US 220V electrics Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-06-01 07:54 +0000
                  Re: Medical devices and US 220V electrics upsidedown@downunder.com - 2017-06-01 12:49 +0300
                    Re: Medical devices and US 220V electrics Neon John <no@never.com> - 2017-06-01 10:28 -0400
                      Re: Medical devices and US 220V electrics Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-06-01 14:45 +0000
                      Re: Medical devices and US 220V electrics Neon John <no@never.com> - 2017-06-01 18:47 -0400
                        Re: Medical devices and US 220V electrics Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-06-01 15:57 -0700
                          Re: Medical devices and US 220V electrics Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-06-02 07:21 +0000
                        Re: Medical devices and US 220V electrics krw@notreal.com - 2017-06-01 18:59 -0400
                Re: Medical devices and US 220V electrics David Lesher <wb8foz@panix.com> - 2017-06-03 14:00 +0000
                  Re: Medical devices and US 220V electrics krw@notreal.com - 2017-06-03 11:19 -0400
      Re: Medical devices and US 220V electrics upsidedown@downunder.com - 2017-05-30 01:16 +0300
        Re: Medical devices and US 220V electrics tabbypurr@gmail.com - 2017-05-29 22:31 -0700
          Re: Medical devices and US 220V electrics Phil Allison <pallison49@gmail.com> - 2017-05-29 23:06 -0700
            Re: Medical devices and US 220V electrics tabbypurr@gmail.com - 2017-05-29 23:25 -0700
              Re: Medical devices and US 220V electrics Phil Allison <pallison49@gmail.com> - 2017-05-29 23:39 -0700
                Re: Medical devices and US 220V electrics tabbypurr@gmail.com - 2017-05-30 00:19 -0700
              Re: Medical devices and US 220V electrics rickman <gnuarm@gmail.com> - 2017-05-30 10:40 -0400
      Re: Medical devices and US 220V electrics rickman <gnuarm@gmail.com> - 2017-05-30 10:37 -0400
    Re: Medical devices and US 220V electrics Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-05-30 16:58 -0700
      Re: Medical devices and US 220V electrics Don Y <blockedofcourse@foo.invalid> - 2017-05-30 22:15 -0700
        Re: Medical devices and US 220V electrics Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-05-31 07:38 -0700
      Re: Medical devices and US 220V electrics Don Kuenz <g@crcomp.net> - 2017-05-31 14:05 +0000
        Re: Medical devices and US 220V electrics Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-05-31 07:40 -0700
        Re: Medical devices and US 220V electrics Don Y <blockedofcourse@foo.invalid> - 2017-05-31 09:37 -0700

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#462310

On Tue, 30 May 2017 16:33:50 +0000 (UTC), David Lesher
<wb8foz@panix.com> wrote:

>krw@notreal.com writes:
>
>>>This always PO'ed me. I want a real electric snowblower, and
>>>lawnmower. I lust for a British 30A 220V ring socket.... 
>
>>Oh, good grief.  Just add a 240V circuit.
>
>No, reality. No one makes/sells 240V lawnmowers & snowblowers
>here, because they would require outlets that most houses lack.
>
>(If I was building myself one it would have a 3-phase motor with
>the VFD back at the garage.)

My lawn guy uses gasoline >:-}
		
                                        ...Jim Thompson
-- 
| James E.Thompson                                 |    mens     |
| Analog Innovations                               |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| STV, Queen Creek, AZ 85142    Skype: skypeanalog |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |

     Thinking outside the box... producing elegant solutions.

"It is not in doing what you like, but in liking what you do that
is the secret of happiness."  -James Barrie

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#462341

On Tue, 30 May 2017 16:33:50 +0000 (UTC), David Lesher
<wb8foz@panix.com> wrote:

>krw@notreal.com writes:
>
>>>This always PO'ed me. I want a real electric snowblower, and
>>>lawnmower. I lust for a British 30A 220V ring socket.... 
>
>>Oh, good grief.  Just add a 240V circuit.
>
>No, reality. No one makes/sells 240V lawnmowers & snowblowers
>here, because they would require outlets that most houses lack.
>
>(If I was building myself one it would have a 3-phase motor with
>the VFD back at the garage.)

Why go to all that work?  Just use a rotary phase converter (an idling
three phase motor) to get the third phase.  Personally, I wouldn't go
near such a snow blower. Gasoline works great.  OTOH, I would never go
near a snow blower again (or snow that needed a snow blower).

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#462390

krw@notreal.com writes:
>>
>>(If I was building myself one it would have a 3-phase motor with
>>the VFD back at the garage.)

>Why go to all that work?  Just use a rotary phase converter (an idling
>three phase motor) to get the third phase.  Personally, I wouldn't go
>near such a snow blower. Gasoline works great.  OTOH, I would never go
>near a snow blower again (or snow that needed a snow blower).

And it always starts in subzero weather, does not need you to
keep fresh gas, never needs the oil changed......

A rotary converter is *easier* than a VFD? Not in my book.


-- 
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

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#462492

On Wed, 31 May 2017 03:31:06 +0000 (UTC), David Lesher
<wb8foz@panix.com> wrote:

>krw@notreal.com writes:
>>>
>>>(If I was building myself one it would have a 3-phase motor with
>>>the VFD back at the garage.)
>
>>Why go to all that work?  Just use a rotary phase converter (an idling
>>three phase motor) to get the third phase.  Personally, I wouldn't go
>>near such a snow blower. Gasoline works great.  OTOH, I would never go
>>near a snow blower again (or snow that needed a snow blower).
>
>And it always starts in subzero weather, does not need you to
>keep fresh gas, never needs the oil changed......

Gas?  Oil?  WTF are you talking about.

>A rotary converter is *easier* than a VFD? Not in my book.

Of course  it's easier.  It's just a motor.  It's done all the time
for surplus woodworking machinery.  VFDs are expensive.

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#462539

On a sunny day (Wed, 31 May 2017 17:58:23 -0400) it happened krw@notreal.com
wrote in <iseuichahb83bhmrof2o5a6us21obpgeqf@4ax.com>:

>On Wed, 31 May 2017 03:31:06 +0000 (UTC), David Lesher
><wb8foz@panix.com> wrote:
>
>>krw@notreal.com writes:
>>>>
>>>>(If I was building myself one it would have a 3-phase motor with
>>>>the VFD back at the garage.)
>>
>>>Why go to all that work?  Just use a rotary phase converter (an idling
>>>three phase motor) to get the third phase.  Personally, I wouldn't go
>>>near such a snow blower. Gasoline works great.  OTOH, I would never go
>>>near a snow blower again (or snow that needed a snow blower).
>>
>>And it always starts in subzero weather, does not need you to
>>keep fresh gas, never needs the oil changed......
>
>Gas?  Oil?  WTF are you talking about.
>
>>A rotary converter is *easier* than a VFD? Not in my book.
>
>Of course  it's easier.  It's just a motor.  It's done all the time
>for surplus woodworking machinery.  VFDs are expensive.

I *have* an electric lawn mower, think it is only 1kW or so,
the kind you need to push (or pull) what is the problem?
Now much snow here lately (last 10 years or so that I can remember),
eh make that last 40 year, eh make that last 60 years...
Oh well.

Those electric movers are OK, just plug it in and it works.
Cleaning it after mowing is most of the work.

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#462543

On Thu, 01 Jun 2017 07:54:54 GMT, Jan Panteltje
<pNa0nStpealmtje@yahoo.com> wrote:

>On a sunny day (Wed, 31 May 2017 17:58:23 -0400) it happened krw@notreal.com
>wrote in <iseuichahb83bhmrof2o5a6us21obpgeqf@4ax.com>:
>
>>On Wed, 31 May 2017 03:31:06 +0000 (UTC), David Lesher
>><wb8foz@panix.com> wrote:
>>
>>>krw@notreal.com writes:
>>>>>
>>>>>(If I was building myself one it would have a 3-phase motor with
>>>>>the VFD back at the garage.)
>>>
>>>>Why go to all that work?  Just use a rotary phase converter (an idling
>>>>three phase motor) to get the third phase.  Personally, I wouldn't go
>>>>near such a snow blower. Gasoline works great.  OTOH, I would never go
>>>>near a snow blower again (or snow that needed a snow blower).
>>>
>>>And it always starts in subzero weather, does not need you to
>>>keep fresh gas, never needs the oil changed......
>>
>>Gas?  Oil?  WTF are you talking about.
>>
>>>A rotary converter is *easier* than a VFD? Not in my book.
>>
>>Of course  it's easier.  It's just a motor.  It's done all the time
>>for surplus woodworking machinery.  VFDs are expensive.
>
>I *have* an electric lawn mower, think it is only 1kW or so,
>the kind you need to push (or pull) what is the problem?
>Now much snow here lately (last 10 years or so that I can remember),
>eh make that last 40 year, eh make that last 60 years...
>Oh well.
>
>Those electric movers are OK, just plug it in and it works.
>Cleaning it after mowing is most of the work.
>

The nice feature of those small movers that you cam easily carry them
from one place to an other, while gas powered devices needs to be
dragged from place to place.

At power levels around 1 kW (1.5 hp) , the current drawn from 230 V is
only 5 A. Since the mover are double insulated no protected ground
(PE) is needed, so a light cable with 2 x 1.5 mm² conductors is
sufficient.

I also have a snow blower with an engine with several horse power
engine. Even so, it sometimes has problems handling thick snow. To do
it electrically would require a 3 x 16 A  230/400 V socket somewhere
in the house (not that uncommon here, but perhaps not outdoors).
Anyway, the thicker cable would be awkward to handle, especially at
cold days.
  
 

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#462556

On Thu, 01 Jun 2017 12:49:20 +0300, upsidedown@downunder.com wrote:


>>>Of course  it's easier.  It's just a motor.  It's done all the time
>>>for surplus woodworking machinery.  VFDs are expensive.

I've purchased a small 120 volt in, 240 volt 3 phase out VFD for $129.
Now go price even a defective 3 phase motor and the capacitors it
takes to run it.  The scrap value of the motor is pretty close to that
cost.  Then compute the running losses of an induction motor phase
converter.  It is quite inefficient.  The OP wants to use this on a
swamp cooler which will run much of the time.  A small VFD that gives
him the added benefit of variable speed, is a no-brainer.

>>
>>I *have* an electric lawn mower, think it is only 1kW or so,
>>the kind you need to push (or pull) what is the problem?

Several years ago I built an electric lawnmower.  Scrap magnesium
deck.  physically small universal motor.  With the blade I selected,
when it's mowing tall grass it draws 17 amps.  Works much better than
the gas mower I tossed out.

My wife wanted a shiny new mower so I ordered her a Worx 12 amp mower.
It comes today.  We'll see how it compares to my scruffy looking
home-made unit.

>>Those electric movers are OK, just plug it in and it works.
>>Cleaning it after mowing is most of the work.

cleaning? :-)

>>
>
>The nice feature of those small movers that you cam easily carry them
>from one place to an other, while gas powered devices needs to be
>dragged from place to place.

True.  My home-made unit weighs less than 20 lbs.

John
John DeArmond
http://www.neon-john.com
http://www.tnduction.com 
Tellico Plains, Occupied TN
See website for email address

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#462565

On a sunny day (Thu, 01 Jun 2017 10:28:01 -0400) it happened Neon John
<no@never.com> wrote in <tb80jctice8clphejnec60duvj916hjmk7@4ax.com>:

>On Thu, 01 Jun 2017 12:49:20 +0300, upsidedown@downunder.com wrote:
>
>
>>>>Of course  it's easier.  It's just a motor.  It's done all the time
>>>>for surplus woodworking machinery.  VFDs are expensive.
>
>I've purchased a small 120 volt in, 240 volt 3 phase out VFD for $129.
>Now go price even a defective 3 phase motor and the capacitors it
>takes to run it.  The scrap value of the motor is pretty close to that
>cost.  Then compute the running losses of an induction motor phase
>converter.  It is quite inefficient.  The OP wants to use this on a
>swamp cooler which will run much of the time.  A small VFD that gives
>him the added benefit of variable speed, is a no-brainer.
>
>>>
>>>I *have* an electric lawn mower, think it is only 1kW or so,
>>>the kind you need to push (or pull) what is the problem?
>
>Several years ago I built an electric lawnmower.  Scrap magnesium
>deck.  physically small universal motor.  With the blade I selected,
>when it's mowing tall grass it draws 17 amps.  Works much better than
>the gas mower I tossed out.
>
>My wife wanted a shiny new mower so I ordered her a Worx 12 amp mower.
>It comes today.  We'll see how it compares to my scruffy looking
>home-made unit.
>
>>>Those electric movers are OK, just plug it in and it works.
>>>Cleaning it after mowing is most of the work.
>
>cleaning? :-)
>
>>>
>>
>>The nice feature of those small movers that you cam easily carry them
>>from one place to an other, while gas powered devices needs to be
>>dragged from place to place.
>
>True.  My home-made unit weighs less than 20 lbs.

There is a guy in a boating group here who uses 4 of those lawnmower type motors
to replace a diesel for his boat, and it actually works.

Picture:
 http://zeilersforum.nl/media/kunena/attachments/16210/20170222_121909a.jpg

Thread in Dutch: 
 http://zeilersforum.nl/index.php/forum-hoofdmenu-37/73-stroom-elektrische-apparatuur-aan-boord/572183-ombouwen-naar-vol-elektrisch-de-diesel-eruit?start=200

Mixed results, but it works.
Huge batteries, converter.

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#462619

On Thu, 01 Jun 2017 10:28:01 -0400, Neon John <no@never.com> wrote:


>My wife wanted a shiny new mower so I ordered her a Worx 12 amp mower.
>It comes today.  We'll see how it compares to my scruffy looking
>home-made unit.

My bad.  The brand is GreenWorks.  18" mower.  It came today.  We cut
the HUGE front yard.  We're satisfied.  It only draws 4.6 amps when
cutting light grass so a lightweight cord can be used.

John

>
>John
>John DeArmond
>http://www.neon-john.com
>http://www.tnduction.com 
>Tellico Plains, Occupied TN
>See website for email address
John DeArmond
http://www.neon-john.com
http://www.tnduction.com 
Tellico Plains, Occupied TN
See website for email address

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#462623

Den fredag den 2. juni 2017 kl. 00.47.17 UTC+2 skrev Neon John:
> On Thu, 01 Jun 2017 10:28:01 -0400, Neon John <no@never.com> wrote:
> 
> 
> >My wife wanted a shiny new mower so I ordered her a Worx 12 amp mower.
> >It comes today.  We'll see how it compares to my scruffy looking
> >home-made unit.
> 
> My bad.  The brand is GreenWorks.  18" mower.  It came today.  We cut
> the HUGE front yard.  We're satisfied.  It only draws 4.6 amps when
> cutting light grass so a lightweight cord can be used.

get something like this: https://forbrugsguiden.dk/wp-content/uploads/2016/07/robotpl%C3%A6neklipper-test.jpg

and have a beer while it does the mowing for you ... 

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#462655

On a sunny day (Thu, 1 Jun 2017 15:57:15 -0700 (PDT)) it happened Lasse
Langwadt Christensen <langwadt@fonz.dk> wrote in
<914bf441-3fd2-4f6c-a42c-2313f3244017@googlegroups.com>:

>get something like this: https://forbrugsguiden.dk/wp-content/uploads/2016/07/robotpl%C3%A6neklipper-test.jpg
>
>and have a beer while it does the mowing for you ... 

What sort of ammo does it use?

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#462624

On Thu, 01 Jun 2017 18:47:07 -0400, Neon John <no@never.com> wrote:

>On Thu, 01 Jun 2017 10:28:01 -0400, Neon John <no@never.com> wrote:
>
>
>>My wife wanted a shiny new mower so I ordered her a Worx 12 amp mower.
>>It comes today.  We'll see how it compares to my scruffy looking
>>home-made unit.
>
>My bad.  The brand is GreenWorks.  18" mower.  It came today.  We cut
>the HUGE front yard.  We're satisfied.  It only draws 4.6 amps when
>cutting light grass so a lightweight cord can be used.

A dinky 18" mower and a HUGE yard don't mix, IMO.  Also, be sure the
blade stay sharp and you don't let the yard go (vacation, monsoon
week, or whatever).   Tall, wet, grass won't be fun.

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#462842

krw@notreal.com writes:


>>>>(If I was building myself one it would have a 3-phase motor with
>>>>the VFD back at the garage.)
>>
>>>Why go to all that work?  Just use a rotary phase converter (an idling
>>>three phase motor) to get the third phase.  Personally, I wouldn't go
>>>near such a snow blower. Gasoline works great.  OTOH, I would never go
>>>near a snow blower again (or snow that needed a snow blower).
>>
>>And it always starts in subzero weather, does not need you to
>>keep fresh gas, never needs the oil changed......

>Gas?  Oil?  WTF are you talking about.

The reasons I want to be rid of gas mowers....

>>A rotary converter is *easier* than a VFD? Not in my book.

>Of course  it's easier.  It's just a motor.  It's done all the time
>for surplus woodworking machinery.  VFDs are expensive.

Such as the one at the Dayton Hamvention for $20....
Electronics are cheap; iron, copper, bushings, and frames cost.
And a FVD is far more capable....



-- 
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

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#462850

On Sat, 3 Jun 2017 14:00:06 +0000 (UTC), David Lesher
<wb8foz@panix.com> wrote:

>krw@notreal.com writes:
>
>
>>>>>(If I was building myself one it would have a 3-phase motor with
>>>>>the VFD back at the garage.)
>>>
>>>>Why go to all that work?  Just use a rotary phase converter (an idling
>>>>three phase motor) to get the third phase.  Personally, I wouldn't go
>>>>near such a snow blower. Gasoline works great.  OTOH, I would never go
>>>>near a snow blower again (or snow that needed a snow blower).
>>>
>>>And it always starts in subzero weather, does not need you to
>>>keep fresh gas, never needs the oil changed......
>
>>Gas?  Oil?  WTF are you talking about.
>
>The reasons I want to be rid of gas mowers....

Why on Earth would you want to do that?

>>>A rotary converter is *easier* than a VFD? Not in my book.
>
>>Of course  it's easier.  It's just a motor.  It's done all the time
>>for surplus woodworking machinery.  VFDs are expensive.
>
>Such as the one at the Dayton Hamvention for $20....
>Electronics are cheap; iron, copper, bushings, and frames cost.
>And a FVD is far more capable....

Electronics aren't cheap.  Surplus motors are.

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#462221

On Mon, 29 May 2017 20:24:21 +0000 (UTC), David Lesher
<wb8foz@panix.com> wrote:

>RBlack <news@rblack01.plus.com> writes:
>
>>Hi,
>
>>We are working on a medical product, which will draw about 3 kW from the 
>>mains.  This is new territory for us, all our previous products were a 
>>few hundred watts max so an off-the-shelf auto-ranging PSU with a 
>>suitable IEC lead was OK for any country in the world.
>
>>3 kW is OK for a standard outlet in 220V countries, but for North 
>>America, Japan etc we are over the limit for a standard 110V outlet.
>
>This always PO'ed me. I want a real electric snowblower, and
>lawnmower. I lust for a British 30A 220V ring socket.... 

In Europe, the most common sockets are:
1 x 10 A @230 V (2 kW)
1 x 16 A @230 V (3 kW)
3 x 16 A @230/400 V (10 kW)

>
>But all we have is wimpy circuits providing flea power. 
>
>My only hope is more garages are getting electric car chargers;
>lotsakilowatts!

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#462257

On Monday, 29 May 2017 23:15:25 UTC+1, upsid...@downunder.com  wrote:
> On Mon, 29 May 2017 20:24:21 +0000 (UTC), David Lesher
> <wb8foz@panix.com> wrote:
> 
> >RBlack <news@rblack01.plus.com> writes:
> >
> >>Hi,
> >
> >>We are working on a medical product, which will draw about 3 kW from the 
> >>mains.  This is new territory for us, all our previous products were a 
> >>few hundred watts max so an off-the-shelf auto-ranging PSU with a 
> >>suitable IEC lead was OK for any country in the world.
> >
> >>3 kW is OK for a standard outlet in 220V countries, but for North 
> >>America, Japan etc we are over the limit for a standard 110V outlet.
> >
> >This always PO'ed me. I want a real electric snowblower, and
> >lawnmower. I lust for a British 30A 220V ring socket.... 
> 
> In Europe, the most common sockets are:
> 1 x 10 A @230 V (2 kW)
> 1 x 16 A @230 V (3 kW)
> 3 x 16 A @230/400 V (10 kW)

Here (UK) they're mostly 240v 30A with some 240v 20A.


NT

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#462259

tabb...@gmail.com wrote:

-----------------------



> > In Europe, the most common sockets are:
> > 1 x 10 A @230 V (2 kW)
> > 1 x 16 A @230 V (3 kW)
> > 3 x 16 A @230/400 V (10 kW)
> 
> Here (UK) they're mostly 240v 30A with some 240v 20A.
> 


** Standard UK sockets and plugs are rated at 13 amps and the plugs are internally fused as well. 

https://www.kenable.co.uk/images/A144FA_MAINS_LEAD_1.jpg

The "ring mains" wiring used means that a given circuit can deliver 30 amps in total.


.... Phil 

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#462260

On Tuesday, 30 May 2017 07:06:56 UTC+1, Phil Allison  wrote:
> tabby wrote:

> > > In Europe, the most common sockets are:
> > > 1 x 10 A @230 V (2 kW)
> > > 1 x 16 A @230 V (3 kW)
> > > 3 x 16 A @230/400 V (10 kW)
> > 
> > Here (UK) they're mostly 240v 30A with some 240v 20A.
> > 
> 
> 
> ** Standard UK sockets and plugs are rated at 13 amps and the plugs are internally fused as well. 
> 
> https://www.kenable.co.uk/images/A144FA_MAINS_LEAD_1.jpg
> 
> The "ring mains" wiring used means that a given circuit can deliver 30 amps in total.
> 
> 
> .... Phil

Yes, if you mean continuous ratings. IRL our ring circuits routinely deliver far above the rated 32A. And a bit naughtily, 30A welders are often run on a 13A plug without problem, as they're not continuous 30A loads.


NT

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#462261

tabb...@gmail.com wrote:

------------------------

> 
> > > > In Europe, the most common sockets are:
> > > > 1 x 10 A @230 V (2 kW)
> > > > 1 x 16 A @230 V (3 kW)
> > > > 3 x 16 A @230/400 V (10 kW)
> > > 
> > > Here (UK) they're mostly 240v 30A with some 240v 20A.
> > > 
> > 
> > 
> > ** Standard UK sockets and plugs are rated at 13 amps and the plugs are internally fused as well. 
> > 
> > https://www.kenable.co.uk/images/A144FA_MAINS_LEAD_1.jpg
> > 
> > The "ring mains" wiring used means that a given circuit can deliver 30 amps in total.
> > 
> > 
> 
> Yes, if you mean continuous ratings. 
>

 
 ** Is there another kind ?? 

 ( apologies to Jack Nicholson) 


> IRL our ring circuits routinely deliver far above the rated 32A.

** The thermal /magnetic breakers should not allow that for long. 

> And a bit naughtily, 30A welders are often run on a 13A plug without 
> problem, as they're not continuous 30A loads.
> 

** 13A BS1362 fuses are a bit sluggish. 

 The 16amp breakers commonly used here will often trip at 16 amps, given a few minutes and warm weather. 



 .....  Phil 
 

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#462266

On Tuesday, 30 May 2017 07:39:06 UTC+1, Phil Allison  wrote:
> tabby wrote:
> 
> ------------------------
> 
> > 
> > > > > In Europe, the most common sockets are:
> > > > > 1 x 10 A @230 V (2 kW)
> > > > > 1 x 16 A @230 V (3 kW)
> > > > > 3 x 16 A @230/400 V (10 kW)
> > > > 
> > > > Here (UK) they're mostly 240v 30A with some 240v 20A.
> > > > 
> > > 
> > > 
> > > ** Standard UK sockets and plugs are rated at 13 amps and the plugs are internally fused as well. 
> > > 
> > > https://www.kenable.co.uk/images/A144FA_MAINS_LEAD_1.jpg
> > > 
> > > The "ring mains" wiring used means that a given circuit can deliver 30 amps in total.
> > > 
> > > 
> > 
> > Yes, if you mean continuous ratings. 
> >
> 
>  
>  ** Is there another kind ?? 
> 
>  ( apologies to Jack Nicholson) 
> 
> 
> > IRL our ring circuits routinely deliver far above the rated 32A.
> 
> ** The thermal /magnetic breakers should not allow that for long. 

They allow it for long enough to not cause nuisance trips when rings deliver 45 or 50A, as is routine in UK households. Naturally they don't run that high for more than 10 or 15 minutes.

The magnetic breaker component acts on large overcurrents only. The thermal bit is the one to act on long low level overcurrents. It has to be rated to pass 32A continuously at max rated environment temp, so no surprise it passes well over 32A for a fair time.


> > And a bit naughtily, 30A welders are often run on a 13A plug without 
> > problem, as they're not continuous 30A loads.
> > 
> 
> ** 13A BS1362 fuses are a bit sluggish. 

they are. Bolts even more so.

>  The 16amp breakers commonly used here will often trip at 16 amps, given a few minutes and warm weather. 

Ours are specced to never trip at rated current.


NT

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