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Tech => Home Brew => Topic started by: rollandelliott on October 18, 2011, 05:46:00 AM

Title: What are typical electric motor effcincy curves look like?
Post by: rollandelliott on October 18, 2011, 05:46:00 AM

I've got a zero ds2010 and I've heard a bunch of people state that driving range is limited the faster you go. I'd like to see a speed vs motor efficiency curve. that way I'd know concretely what the best/optimal speed is. I'm guessing it is 25mph since that is what zero says will get you a 40mile range.

Title: Re: What are typical electric motor effcincy curves look like?
Post by: Bogan on October 18, 2011, 01:12:10 PM

The motor efficiency is relatively constant, it's the air drag which increases exponentially the quicker you go, 5mph would probably get you really good range, but it isn't too practical.

Title: Re: What are typical electric motor effcincy curves look like?
Post by: frodus on October 18, 2011, 10:25:39 PM

not entirely true .... efficiency is flat, but only for a very small range of RPM. Motenergy motor curves show only a small portion of efficiency. Looking at other motors though, they can go from 30% up to 90%+ on the same motor, depending on the RPM you're in.


What motor is in the 2010 Zero DS?



And I second Bogan, the more HP you're using, the less range you'll get. The faster you go the more HP you need, and at about 40mph, air resistance becomes an issue, and its exponential.

Title: Re: What are typical electric motor effcincy curves look like?
Post by: rollandelliott on October 20, 2011, 10:21:45 PM

i went to zero's web site and it says it uses and angi motor
http://www.agnimotors.com/home/index.php?option=com_content&task=view&id=5&Itemid=60 (http://www.agnimotors.com/home/index.php?option=com_content&task=view&id=5&Itemid=60)
is their web site but not sure what motor it is.

Title: Re: What are typical electric motor effcincy curves look like?
Post by: frodus on October 21, 2011, 12:32:29 AM

likely a 95 or 95R

Title: Re: What are typical electric motor effcincy curves look like?
Post by: alecriss on November 10, 2011, 06:45:39 PM

I think it's 95r..