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Discussion Starter · #1 ·
Re: [EVDL] Etek Motor Sevcon Controller Regenerative Operation

Hi Rick,

I use Sevcon 4 quadrant controllers with separately
excited motors and they work well. Down to low speed
and are configurable to braking torque and therefore a
generator current limit, I think. I see no reason I
could not use one for a generator. I have considered
this, but have not done it yet.

I have no experience with the PM controller. You
should be able to get the manual for it.

Beware, I am not sure you can get very good voltage
control in generator mode. So I am not sure how well
this would work charging batteries over a long period.
Regen on my vehicles is just for a few seconds and
never completely charges the battery. You may need
some sort of regulator circuit.

Regards,

Jeff M



--- Rick Willoughby <[email protected]> wrote:

>
> I have a couple of questions concerning the
> regenerative mode of operation
> with an Etek motor in combination with a Sevcon
> 4-quadrant controller.
>
> My reason for the questions is to assess the
> suitability of the motor as a
> generator for a wind turbine.
>
> Using a 48V system, what is the slowest RPM that the
> motor can achieve
> useful charging current. For example will it still
> be able to produce 20A
> at say 600rpm into a 48V battery.
>
> The other question concerns the current limit. Is
> it possible to set the
> current limit in regenerative mode so it does not
> exceed say 50A.
>
> I am also interested in comments on these units from
> anyone actually
> operating them in 4-quadrant mode in vehicle
> applications. Are there any
> particular concerns or detail to be aware of?
>
> Rick W.


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Discussion Starter · #3 ·
Re: [EVDL] Etek Motor Sevcon Controller Regenerative Operation

Jeff
Thank you. I appreciate the information.

What motor are you using? And do you boost field voltage when you are in
braking mode?

I had not thought too much about the possibility of overcharging as I am
only thinking about getting enough into the battery. It certainly raises a
valid point. I am intending to use fixed blades on the turbine so I will
need some sort of automatic furling to prevent overcharging.

Rick W.

Jeff Major wrote:
>
>
> Hi Rick,
>
> I use Sevcon 4 quadrant controllers with separately
> excited motors and they work well. Down to low speed
> and are configurable to braking torque and therefore a
> generator current limit, I think. I see no reason I
> could not use one for a generator. I have considered
> this, but have not done it yet.
> ........
>
> Regen on my vehicles is just for a few seconds and
> never completely charges the battery. You may need
> some sort of regulator circuit.
>
> Regards,
>
> Jeff M
>
>
>
> --- Rick Willoughby <[email protected]> wrote:
>
>>
>> I have a couple of questions concerning the
>> regenerative mode of operation
>> with an Etek motor in combination with a Sevcon
>> 4-quadrant controller.
>>
>> My reason for the questions is to assess the
>> suitability of the motor as a
>> generator for a wind turbine.
>>
>> Using a 48V system, what is the slowest RPM that the
>> motor can achieve
>> useful charging current. For example will it still
>> be able to produce 20A
>> at say 600rpm into a 48V battery.
>>
>> The other question concerns the current limit. Is
>> it possible to set the
>> current limit in regenerative mode so it does not
>> exceed say 50A.
>>
>> I am also interested in comments on these units from
>> anyone actually
>> operating them in 4-quadrant mode in vehicle
>> applications. Are there any
>> particular concerns or detail to be aware of?
>>
>> Rick W.
>
>
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Registered
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70 Posts
Discussion Starter · #4 ·
Re: [EVDL] Etek Motor Sevcon Controller Regenerative Operation

You're welcome, Rick.

I use a D and D SepEx 6.6 inch motor. Pretty much
like a golf cart motor. In fact I have used a GE golf
cart SepEx motor for the prototype with a Curtis SepEx
controller.

And the controller takes care of the field strength
during regen. Pretty much automatic. I think what
happens is that at high speed, they chop the field and
then as speed reduces, keep the field full and chop
(boost) the armature.

With the Sevcon, they allow you to set it up for a pot
input for regen strength. This might allow you to
fashion a regulator circuit with voltage feedback to
get what you need. Just guessing. But for the nice
package and price of the Sevcon, would be worth
considering.

Regards,

Jeff M



--- Rick Willoughby <[email protected]> wrote:

>
> Jeff
> Thank you. I appreciate the information.
>
> What motor are you using? And do you boost field
> voltage when you are in
> braking mode?
>
> I had not thought too much about the possibility of
> overcharging as I am
> only thinking about getting enough into the battery.
> It certainly raises a
> valid point. I am intending to use fixed blades on
> the turbine so I will
> need some sort of automatic furling to prevent
> overcharging.
>
> Rick W.
>
> Jeff Major wrote:
> >
> >
> > Hi Rick,
> >
> > I use Sevcon 4 quadrant controllers with
> separately
> > excited motors and they work well. Down to low
> speed
> > and are configurable to braking torque and
> therefore a
> > generator current limit, I think. I see no reason
> I
> > could not use one for a generator. I have
> considered
> > this, but have not done it yet.
> > ........
> >
> > Regen on my vehicles is just for a few seconds
> and
> > never completely charges the battery. You may
> need
> > some sort of regulator circuit.
> >
> > Regards,
> >
> > Jeff M
> >
> >
> >
> > --- Rick Willoughby <[email protected]>
> wrote:
> >
> >>
> >> I have a couple of questions concerning the
> >> regenerative mode of operation
> >> with an Etek motor in combination with a Sevcon
> >> 4-quadrant controller.
> >>
> >> My reason for the questions is to assess the
> >> suitability of the motor as a
> >> generator for a wind turbine.
> >>
> >> Using a 48V system, what is the slowest RPM that
> the
> >> motor can achieve
> >> useful charging current. For example will it
> still
> >> be able to produce 20A
> >> at say 600rpm into a 48V battery.
> >>
> >> The other question concerns the current limit.
> Is
> >> it possible to set the
> >> current limit in regenerative mode so it does not
> >> exceed say 50A.
> >>
> >> I am also interested in comments on these units
> from
> >> anyone actually
> >> operating them in 4-quadrant mode in vehicle
> >> applications. Are there any
> >> particular concerns or detail to be aware of?
> >>
> >> Rick W.


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