How efficient are SEPEX motors? I have searched but can't find the much info on sepex motors. This would be for a 400cc Honda CM400A. Almost everything is Three phase AC with a few brushed PM motors discussions on Endless Sphere now.
Later floyd
Sepex motors tend to be largish, heavy probably due to copper windings for both the field and armature.
Brush and commutator technology will see some heating and efficiency losses.
Changing the field magnetic strength does add some interesting performance options.
If you happen to head that direction I have a working 72V 400A Curtis controller removed from an IT car looking for a new home.
We changed up to a 600A version and added forced air cooling to the motor.
Sepex motors tend to be largish, heavy probably due to copper windings for both the field and armature.
Brush and commutator technology will see some heating and efficiency losses.
Changing the field magnetic strength does add some interesting performance options.
If you happen to head that direction I have a working 72V 400A Curtis controller removed from an IT car looking for a new home.
We changed up to a 600A version and added forced air cooling to the motor.
Thank you for the reply
The motor i am looking at is a D&D model ES-89 ~7" by 10.5" ~60 lbs with two Curtis controllers 400A 600A 36V-84V
The motor is 36-48 but can be overvolted to 72V safely the seller says. I don't know if my calculations are right I figured 15% losses 16kW @51.8V and 360A 18kW@59.2V and 360A 23.7kW@77.7V and 360A all voltages are nominal.
23,.7kW @51.8 and 540A 27kW@59,2V and 540A 35.6kW@77.7V and 540A
I have 10 7s1p 63Ah modules, and could get the 16s modules. The 77.7V nominal might be pushing it for the motor
The field control and regen is what caught my eye.
later floyd
We updated our 2003 GEM car with a D&D motor and reprogrammed the GE controller which gave it a massive acceleration and speed improvement.
Regen worked great to slow the car when releasing the throttle but I don't think it put much back into the battery.
That motor is robust and can take an over voltage without worry.
If you don't mind the motor weight and the price is good it could be a decent build.
Usually that motor is used with 6 ~ 700 pounds of lead batteries in a golf cart (or NEV) without much airflow to the brushes.
A light motorcycle where the motor is open to airflow, it will be fine.
I still have the programmer for the Curtis controllers.
Oh ... amp/hours rating is different then discharge amps.
Lead batteries in the GEM car can peak discharge at 1,000 amps.
If your buying used ... it might be good idea to ask for a picture of the brushes and commutator.
We updated our 2003 GEM car with a D&D motor and reprogrammed the GE controller which gave it a massive acceleration and speed improvement.
Regen worked great to slow the car when releasing the throttle but I don't think it put much back into the battery.
That motor is robust and can take an over voltage without worry.
If you don't mind the motor weight and the price is good it could be a decent build.
Usually that motor is used with 6 ~ 700 pounds of lead batteries in a golf cart (or NEV) without much airflow to the brushes.
A light motorcycle where the motor is open to airflow, it will be fine.
I still have the programmer for the Curtis controllers.
Oh ... amp/hours rating is different then discharge amps.
Lead batteries in the GEM car can peak discharge at 1,000 amps.
Thank you, I sent the seller an offer. This is the item https://www.ebay.com/itm/325451710644?
The LG modules I have, Evwest tested to 500+ amps of course Evwest modules were new. mine are salvaged. I have enough to make a 3p21s1p 189Ah battery pack but doubtful there is room for all that battery.
Pc programmer or handheld?
Only a few hundred miles from local But only 60 miles from the motors. I thought it seemed like a good deal. Hopefully he will get back to me on my offer.
Later floyd
I have searched but can't find the much info on sepex motors. This would be for a 400cc Honda CM400A. Almost everything is Three phase AC with a few brushed PM motors discussions on Endless Sphere now.
Sepex is also a brushed DC motor, it just uses a separately excited field winding, instead of a series-wired field winding, so that the controller has to have a separate output for the field winding, rather than using one output wire pair to run the whole motor.
I have searched but can't find the much info on sepex motors. This would be for a 400cc Honda CM400A. Almost everything is Three phase AC with a few brushed PM motors discussions on Endless Sphere now.
Sepex is also a brushed DC motor, it just uses a separately excited field winding, instead of a series-wired field winding, so that the controller has to have a separate output for the field winding, rather than using one output wire pair to run the whole motor.
Looks like I needed to be more specific in my question sorry. I am after efficiency ratings of Sepex motors. Not how they work. I figured 85% in my calculations in a previous post in this thread.
later floyd
85% is probably in the ballpark at the peak. All the power going to the field winding is a loss, on top of other losses.
The motor manufacturer may have an efficiency graph for a particular model.
85% is probably in the ballpark at the peak. All the power going to the field winding is a loss, on top of other losses.
The motor manufacturer may have an efficiency graph for a particular model.
I have to go pick the motors and controllers up sometime between the storms. Glad the motors are to the north of me cause south of me much of the area is underwater.
Later floyd
But only 60 miles from the motors. I thought it seemed like a good deal. Hopefully he will get back to me on my offer.
