Re: (ET) E12S and a curtis controller??

["Steve Richardson" <scr echoweb net>]

Bob,

 

I wasn't trying to convince you to by a series controller.  It would be a waste of energy to turn on the field all the time.

 

Our soon to be released Sep-X controller would be the most efficient for the E12 if it has a separate low current field winding.  The new controller adjust the field and the armature current based on the load and throttle position which helps to maintain constant speed.

 

Does anyone have any details on the E12 motor I could look at?

 

Thanks Bob for your confidence..

 

Steve

scr echoweb net

 

----- Original Message -----

From: Bob Murcek

To: scr echoweb net

Cc: elec-trak cosmos phy tufts edu

Sent: Wednesday, June 25, 2003 7:23 PM

Subject: Re: (ET) E12S and a curtis controller??

Steve,

I think you just convinced me that your controller could work on an E12 since on these the shunt field is always full on and the motor would look more or less like a PM motor to the controller...Bob

>>> "Steve Richardson" <scr echoweb net> 6/25/2003 10:08:14 PM >>>

Hello Bob,

 

You are correct for the most part.

 

The motors I'm familiar with on the E15's are basically shunt wound motors.  That means field and armature has different requirements.  A series controller cannot be used on a shunt wound motor because it has a single output stage that sees the series connected field and armature of a series motor as one load.  A series controller can be used on PM motor though because it looks like a series motor to the controller.

 

A shunt or Sep-X (separately excited field) controller has two output stages and each are controlled separately, based on the load applied to the motor.

 

The E15 motor has two single loop windings in series with the field to cut down on brush arching. 

 

Alltrax Series controllers are designed to handle the extremely low resistance that a series motor represents to any controller.  Series motors are the preferred motor when you want high starting torque because they have the most torque at stall or zero speed and our controllers are designed to handle that high initial current requirement.

 

Did I answer your questions adequately ?

If not let me know.

 

Thanks

 

Steve Richardson

scr echoweb net

 

 

 

----- Original Message -----

From: Bob Murcek

To: scr echoweb net ; daveb seanet com ; agp vt edu

Cc: elec-trak cosmos phy tufts edu

Sent: Wednesday, June 25, 2003 6:44 AM

Subject: Re: (ET) E12S and a curtis controller??

Someone else on the list has a better understanding of the motors, but my understanding is that they are only slightly series, they're mainly shunt motors with a compensating series winding to help hold speed as load increases.  I think they'd need the same type of controller as a shunt or PM motor. 

 

Aside from not having a specific output for the shunt field, is there anything about the Alltrax controller that's specifically intended for a series motor?

>>> "Steve Richardson" <scr echoweb net> 6/25/2003 12:02:40 AM >>>
Dave, Andy;

If the E12's use a series motor we already have controllers for that.  We
make a range of models and current ratings that vary in price accordingly.
Please see our web site at www.alltraxinc.com for details, including prices
for the SERIES controllers.

  Our original SERIES Golf Car controllers were designed to replace the
Curtis 1204 and 1205 series controllers

I can vision a less expensive kit for the E12's that could include the
appropriate SERIES controller, main fuse, throttle control, fwd/rev switch,
wiring and instructions.

How's that Dave ?

Steve
scr echoweb net


I will ----- Original Message -----
From: "Dave Barden" <daveb seanet com>
To: "'Steve Richardson'" <scr echoweb net>; "'Andrew Poush'" <agp vt edu>
Cc: <elec-trak cosmos phy tufts edu>
Sent: Tuesday, June 24, 2003 8:32 PM
Subject: RE: (ET) E12S and a curtis controller??


> I'd like to know if there'll be a kit for the E12S which has a different
> motor.  I don't think it uses field weakening.  Can someone provide a
> concise summary of the characteristics of the E12, E12S, 15 and 20??
>
> thanks,
> dave
> seattle
> e12S
> e15mod
>
> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu
> [mailto:elec-trak-bounces cosmos phy tufts edu]On Behalf Of Steve
> Richardson
> Sent: Tuesday, June 24, 2003 6:52 PM
> To: Andrew Poush
> Cc: elec-trak cosmos phy tufts edu
> Subject: Re: (ET) E12S and a curtis controller??
>
>
> Hi Andy,
>
> I can't quote any numbers yet because we just don't know.
> The kit price is even a bigger unknown because we want to replace the
manual
> contactor on the side of the console with a real live SEALED contactor
that
> will be controlled by the controller (the controller has a contactor
control
> circuit built in so it can disconnect power if a major fault occurs).  We
> have not yet found a supplier for that contactor.  The field will be
> controlled by the controller based on the throttle input signal, and load.
> I apologize that I don't have all the answers yet.
>
> We feel this retro kit should include all the safety features that we have
> to provide on Golf Carts.  We also believe that the kit should be field
> installable by a normal do-it-your-self kinda guy.  We think the kit
should
> include the controller, throttle control, Sealed contactor, fuse, all
> necessary wiring and detailed instructions how to install everything.
>
> Everything will be finalized after we finish upgrading my E15.  Also I
think
> there are differences between say the E15 and E20.  I don't know what
those
> are at this time.
> Does anyone else know?
>
> I hope this answers most of your questions Andy.  Frankly this controller
> has become more popular than we thought so we were caught unprepared to
> offer up all the particulars so soon.
>
> Thanks
>
> Steve
> scr echoweb net
>
>
> ----- Original Message -----
> From: "Andrew Poush" <agp vt edu>
> To: "Steve Richardson" <scr echoweb net>
> Cc: <elec-trak cosmos phy tufts edu>
> Sent: Tuesday, June 24, 2003 5:32 AM
> Subject: Re: (ET) E12S and a curtis controller??
>
>
> > Steve,
> > I would like to know two things:
> > 1)  how much do you estimate the conversion kit to cost?
> > 2)  does the controller include field weakening?  if so, up to what top
> > speed?
> >
> > Thanks,
> > Andy
> >
> > On Monday, June 23, 2003, at 10:55  PM, Steve Richardson wrote:
> >
> > > Hi David,
> > >
> > > You know us I'm sure, you being an old EV'er.
> > > Its Alltrax Inc., or formally DCP.
> > >
> > > See our web site at;
> > > www.alltraxinc.com
> > >
> > > We have not made any formal announcements yet about the new
> > > controller, but
> > > it should be available for the Elec-Traks first since my E-15 will be
> > > used
> > > to iron out the bugs.
> > >
> > > Steve
> > > scr echoweb net
> > >
> > > ----- Original Message -----
> > > From: "David Roden (Akron OH USA)" <roden ald net>
> > > To: <elec-trak cosmos phy tufts edu>
> > > Sent: Monday, June 23, 2003 7:38 PM
> > > Subject: Re: (ET) E12S and a curtis controller??
> > >
> > >
> > >> On 23 Jun 2003 at 19:07, Steve Richardson wrote:
> > >>
> > >>> If you are not in a great hurry, in 4 or 5 weeks from now my company
> > >>> can
> > >>> offer you a controller that is designed for the E-15 type sep-x
> > >>> motor.
> > >>
> > >> May I inquire -- what company is that?
> > >>
> > >>
> > >> David Roden - Akron, Ohio, USA
> > >> 1991 Solectria Force 144vac
> > >> 1991 Ford Escort Green/EV 128vdc
> > >> 1970 GE Elec-trak E15 36vdc
> > >> 1974 Avco New Idea 36vdc
> > >> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> > >> Thou shalt not send me any thing which says unto thee, "send this to
> > >> all
> > >>
> > >> thou knowest."  Neither shalt thou send me any spam, lest I smite
> > >> thee.
> > >>
> > >> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> > >>
> > >> Est. yearly US cost to safeguard Persian Gulf oil supply: $50 billion
> > >>
> > >> Est. 2001 value of US crude oil imports from Persian Gulf: $19
billion
> > >> -- Harper's Index, April 2002
> > >> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> > >>
> > >>
> > >>
> > >> _______________________________________________
> > >> Elec-trak mailing list
> > >> Elec-trak cosmos phy tufts edu
> > >> https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
> > >>
> > >>
> > >
> > >
> > > _______________________________________________
> > > Elec-trak mailing list
> > > Elec-trak cosmos phy tufts edu
> > > https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
> > >
> >
> >
> >
>
>
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