Search found 7 matches

by MPaulHolmes
Sun, 04 Dec 2011, 05:43
Forum: General EV Discussion
Topic: 10KW BLDC FROM GOLDEN MOTOR Model HPM-10kw
Replies: 14
Views: 16232

10KW BLDC FROM GOLDEN MOTOR Model HPM-10kw

A company in Turkey was telling me that whenever they buy motor controllers from Golden Motor, Golden Motor sends fewer than what was ordered, and they take a very long time to ship.
by MPaulHolmes
Tue, 08 Sep 2009, 20:01
Forum: Electric motors and controllers
Topic: Open Source DC controller
Replies: 110
Views: 20270

Open Source DC controller

I was mainly concerned with ripple current. The EVTech list had also told me that basically the more capacitance and ripple current the better. I went with the approach of getting as much ripple current capability as possible in the space I had in order to keep the caps cool. I didn't do any officia...
by MPaulHolmes
Tue, 08 Sep 2009, 09:53
Forum: Electric motors and controllers
Topic: Open Source DC controller
Replies: 110
Views: 20270

Open Source DC controller

Within the space right now, the sixteen 820uF caps I'm using take about 3-4 times longer to precharge than the Curtis 1231c according to Joe. He had to change to a smaller value precharge resistor. There is also another larger cap that's just about 10mm taller but same diameter that we could use wit...
by MPaulHolmes
Mon, 07 Sep 2009, 20:21
Forum: Electric motors and controllers
Topic: Open Source DC controller
Replies: 110
Views: 20270

Open Source DC controller

I emailed them and asked for 10 samples. We'll see what happens. They also have a new 250v mosfet with an RdsOn of 12.9 mOhms I think. 500v diodes are pretty easy to find, so I think it would be basically the same price for making a 200v controller instead of a 144v. Well, maybe an extra $20 or $30....
by MPaulHolmes
Fri, 04 Sep 2009, 10:53
Forum: Electric motors and controllers
Topic: Open Source DC controller
Replies: 110
Views: 20270

Open Source DC controller

FANCY MOSFETS! Check out those mosfets! They won "best in show" or whatever at the 2009 mosfet fair or something like that. I was reading about that. Digikey has them for $7 each in quantities of 10, but are out of stock until December. Now, if we could get synchronous rectification working, or som...
by MPaulHolmes
Wed, 02 Sep 2009, 14:12
Forum: Electric motors and controllers
Topic: Open Source DC controller
Replies: 110
Views: 20270

Open Source DC controller

Hey Squiggles! The intrinsic diodes in the mosfets don't help. The freewheel diodes conduct from M- to B+, whereas the mosfet intrisic diodes go from B- to M-. Isn't that sad!?
by MPaulHolmes
Wed, 02 Sep 2009, 08:28
Forum: Electric motors and controllers
Topic: Open Source DC controller
Replies: 110
Views: 20270

Open Source DC controller

Hello! I think D6 protects against spikes. This is the datasheet: http://www.diodes.com/datasheets/ds21502.pdf Also, see R17, a 1k pulldown to make sure the driver output is pulled low. I learned the hard way to make sure to have one of those. The bike controller I made first didn't have that, and t...