I agree with robert, how the inverter is capable of 'charge the battery' from regen when at very low RPMs?
Another doubt I would add is; different than when using the system as 'motor' with the 6 IGBTs putting power in a specific sequence on the coils. But how an AC induction motor can work as a generator without any 'natural magnets' that would induce energy back on the coils? (Like it works on DC generators) Is that the inverter 'excites' the coils first (using the battery pack voltage) and then harvest the power X times greater? Marco Gaxiola EnergyEV.com Sent from my iPhone > On Jan 2, 2017, at 5:30 PM, ROBERT via EV <[email protected]> wrote: > > As always with me yes and no. I understand the use of a bidirectional buck > boost inverter for varies battery types or supercap usage. However, I need > more info on the switching of the H-Bridge during regen. An AC inverter has > 6 IGBTs is H-bridge configurations. Two IGBTs are assigned for each motor > phase (upper and lower IGBT). The upper IGBT is never switched on when the > lower IGBT is energized and vise versa. A dead time is included between > switching. By switching the 6 IGBTs in a certain sequence, the 3 phase > voltages are created. I understand all this. What I do not understand is > the switching sequence that occurs during regen. In addition, as the vehicle > slows down, the motor acting as a generator outputs a decreasing voltage > because the RPMs are decreasing. The motor/generator is outputting a > decreasing 3 phase voltage. If the voltage is less than the DC voltage of > the battery, there is no potential to charge the battery. How do you get the > AC converter t o > DC to charge the batter? > > > > ________________________________ > From: EV <[email protected]> on behalf of Cor van de Water via EV > <[email protected]> > Sent: Monday, January 2, 2017 4:43 PM > To: Electric Vehicle Discussion List > Subject: Re: [EVDL] Regen on AC Inverter > > Robert, > An AC motor is by definition a motor that needs 3-phase (or more) AC > power. The direction of power (acceleration or braking) is only > determined by the phase (direction) of the current. > So, an AC controller will always automatically include the ability to do > regen. > > The requirement for example with the Toyota Prius from MY 2004 onward to > use a bi-directional boost converter is because the engineers wanted to > use a 200V battery as well as have 500V at the inverter to increase > power and speed over the 300V that was the battery voltage of the > 2001-2003 Prius. > > Hope this clarifies, > > Cor van de Water > Chief Scientist > Proxim Wireless > > office +1 408 383 7626 Skype: cor_van_de_water > XoIP +31 87 784 1130 private: cvandewater.info > > http://www.proxim.com > Proxim - Wireless Broadband, Backhaul Solutions and Access > ...<http://www.proxim.com/> > www.proxim.com > Proxim Wireless offers licensed and unlicensed point to point, backhaul, > bridge, point to multipoint, wireless broadband and wireless access points. > > > > This email message (including any attachments) contains confidential and > proprietary information of Proxim Wireless Corporation. If you received > this message in error, please delete it and notify the sender. Any > unauthorized use, disclosure, distribution, or copying of any part of > this message is prohibited. > > > -----Original Message----- > From: EV [mailto:[email protected]] On Behalf Of ROBERT via EV > Sent: Monday, January 02, 2017 3:10 PM > To: [email protected] > Subject: [EVDL] Regen on AC Inverter > > In order to accomplish regen with an AC inverter on an all electric > vehicle are the IGBTs modulated or is a buck boost circuit added to the > inverter? > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20170102/5e29 > 7b37/attachment.htm> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at NEDRA > (http://groups.yahoo.com/group/NEDRA) > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20170103/d55686d5/attachment.htm> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
