I am converting my John Deere L111 Riding Lawn Mower from ICE to
all-electric. There are a couple of design considerations and I would
greatly appreciate recommendations and comments from the Group. I think your
help and ideas will save much time, money and, above all, frustrations.
My design criteria's are:
1) It must operate very much like it originally did, or else my Chief
Operator (wife) will not be happy ... and you know how that goes.
2) Because of above, I believe it is best to stick with the hydrostatic
transaxle, even recognizing the inherent losses. I think I can live with
that. The hydrostat is very simple to operate, with no gear shifting or
switching to go from forward to reverse.
At this point, I plan on using equipment on hand:
> Advanced DC motor 140-22-4001A
> Curtis 1204X-4407 (24-36 VDC) Not 100% sure about this one.
> Six 6-volt Golf Cart Batteries ... not yet acquired. (operate at 36 V)
Preliminary design is to mount the motor, vertically, above the transaxle
input drive shaft and directly couple the two units together, through an
appropriate coupler. This design has been "mocked up" and appears to be do'
able. (See blog link, below.)
Here is where I need s little help:
The rotational direction of the motor is opposite from what is required with
my proposed arrangement. Since the motor is single-ended, I would need to
reverse the motor direction.
QUESTION ONE: Is running the motor in the reverse direction possible? I
assume some changes need to be made ... and what are they? Can I do this
myself or should I send it to a motor shop to have it done? Can any motor
shop do it?
QUESTION TWO: The hydrostatic transaxle should operate at around 3000 rpm,
continuously. Obviously, the DC motor speed could vary from runaway over
speed, with no load to some undetermined lower speed under heavy load. Is
there a controller, or some other way, to control the motor speed,
regardless of load, to around 3000 rpm, say +/- 200-300 rpm within limits of
the power available, of course. There is a multi-bladed cooling fan that is
between the motor and transaxle. (I have a piece of reflective tape on one
blade to use with my optical digital tachometer.)
Any and all help and suggestions will be GREATLY appreciated.
Roger Daisley
Pullman, WA
[email protected]
http://ElectricTractor.blogspot.com
http://ElectricVW.blogspot.com
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all-electric. There are a couple of design considerations and I would
greatly appreciate recommendations and comments from the Group. I think your
help and ideas will save much time, money and, above all, frustrations.
My design criteria's are:
1) It must operate very much like it originally did, or else my Chief
Operator (wife) will not be happy ... and you know how that goes.
2) Because of above, I believe it is best to stick with the hydrostatic
transaxle, even recognizing the inherent losses. I think I can live with
that. The hydrostat is very simple to operate, with no gear shifting or
switching to go from forward to reverse.
At this point, I plan on using equipment on hand:
> Advanced DC motor 140-22-4001A
> Curtis 1204X-4407 (24-36 VDC) Not 100% sure about this one.
> Six 6-volt Golf Cart Batteries ... not yet acquired. (operate at 36 V)
Preliminary design is to mount the motor, vertically, above the transaxle
input drive shaft and directly couple the two units together, through an
appropriate coupler. This design has been "mocked up" and appears to be do'
able. (See blog link, below.)
Here is where I need s little help:
The rotational direction of the motor is opposite from what is required with
my proposed arrangement. Since the motor is single-ended, I would need to
reverse the motor direction.
QUESTION ONE: Is running the motor in the reverse direction possible? I
assume some changes need to be made ... and what are they? Can I do this
myself or should I send it to a motor shop to have it done? Can any motor
shop do it?
QUESTION TWO: The hydrostatic transaxle should operate at around 3000 rpm,
continuously. Obviously, the DC motor speed could vary from runaway over
speed, with no load to some undetermined lower speed under heavy load. Is
there a controller, or some other way, to control the motor speed,
regardless of load, to around 3000 rpm, say +/- 200-300 rpm within limits of
the power available, of course. There is a multi-bladed cooling fan that is
between the motor and transaxle. (I have a piece of reflective tape on one
blade to use with my optical digital tachometer.)
Any and all help and suggestions will be GREATLY appreciated.
Roger Daisley
Pullman, WA
[email protected]
http://ElectricTractor.blogspot.com
http://ElectricVW.blogspot.com
_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev