Can I run a "brushless DC FAN" backwards?
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From: JosephKK on 8 Aug 2010 17:35 On Mon, 02 Aug 2010 00:35:51 -0700, mike <spamme0(a)go.com> wrote: >I have a project that needs reversible fans. >Can I make a brushless fan go backwards? >Is it as simple as swapping the leads on the coils? >Or is there more to it, like wrong phase for the magnetic pulse >into the hall device? > >And then there's the question whether the blades will >move as much air running backwards. > >The muffin fan is the ideal form factor for this job. > >Only other cost effective thing I can think to do is >put two fans in series and run either one. > >I really don't want to spend the money to buy reversible fans >even if they're available. I gots boxes of muffin fans. > >Ideas? >Thanks, mike Just physically turn it over. The mountings are symmetric for just that reason.
From: mike on 9 Aug 2010 18:14 JosephKK wrote: > On Mon, 02 Aug 2010 00:35:51 -0700, mike <spamme0(a)go.com> wrote: > >> I have a project that needs reversible fans. >> Can I make a brushless fan go backwards? >> Is it as simple as swapping the leads on the coils? >> Or is there more to it, like wrong phase for the magnetic pulse >> into the hall device? >> >> And then there's the question whether the blades will >> move as much air running backwards. >> >> The muffin fan is the ideal form factor for this job. >> >> Only other cost effective thing I can think to do is >> put two fans in series and run either one. >> >> I really don't want to spend the money to buy reversible fans >> even if they're available. I gots boxes of muffin fans. >> >> Ideas? >> Thanks, mike > > Just physically turn it over. The mountings are symmetric for just > that reason. As I stated in the first line of my original posting, I need a REVERSIBLE muffin fan. I already know how to run it forwards, so I asked about backwards.
From: JosephKK on 11 Aug 2010 01:07 On Mon, 09 Aug 2010 15:14:38 -0700, mike <spamme0(a)go.com> wrote: >JosephKK wrote: >> On Mon, 02 Aug 2010 00:35:51 -0700, mike <spamme0(a)go.com> wrote: >> >>> I have a project that needs reversible fans. >>> Can I make a brushless fan go backwards? >>> Is it as simple as swapping the leads on the coils? >>> Or is there more to it, like wrong phase for the magnetic pulse >>> into the hall device? >>> >>> And then there's the question whether the blades will >>> move as much air running backwards. >>> >>> The muffin fan is the ideal form factor for this job. >>> >>> Only other cost effective thing I can think to do is >>> put two fans in series and run either one. >>> >>> I really don't want to spend the money to buy reversible fans >>> even if they're available. I gots boxes of muffin fans. >>> >>> Ideas? >>> Thanks, mike >> >> Just physically turn it over. The mountings are symmetric for just >> that reason. > >As I stated in the first line of my original posting, >I need a REVERSIBLE muffin fan. >I already know how to run it forwards, so I asked about backwards. Only if it is 40 years old already and runs on DC.
From: Jim Thompson on 11 Aug 2010 10:39
On Tue, 10 Aug 2010 22:07:13 -0700, "JosephKK"<quiettechblue(a)yahoo.com> wrote: >On Mon, 09 Aug 2010 15:14:38 -0700, mike <spamme0(a)go.com> wrote: > >>JosephKK wrote: >>> On Mon, 02 Aug 2010 00:35:51 -0700, mike <spamme0(a)go.com> wrote: >>> >>>> I have a project that needs reversible fans. >>>> Can I make a brushless fan go backwards? >>>> Is it as simple as swapping the leads on the coils? >>>> Or is there more to it, like wrong phase for the magnetic pulse >>>> into the hall device? >>>> >>>> And then there's the question whether the blades will >>>> move as much air running backwards. >>>> >>>> The muffin fan is the ideal form factor for this job. >>>> >>>> Only other cost effective thing I can think to do is >>>> put two fans in series and run either one. >>>> >>>> I really don't want to spend the money to buy reversible fans >>>> even if they're available. I gots boxes of muffin fans. >>>> >>>> Ideas? >>>> Thanks, mike >>> >>> Just physically turn it over. The mountings are symmetric for just >>> that reason. >> >>As I stated in the first line of my original posting, >>I need a REVERSIBLE muffin fan. >>I already know how to run it forwards, so I asked about backwards. > >Only if it is 40 years old already and runs on DC. And PM. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Spice is like a sports car... Performance only as good as the person behind the wheel. |