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Don M
08-14-2011, 02:21 PM
Looking for a module that can handle a motor that I have that draws 5 amps or less. Anyone have a good lead on a supplier or where I can find such a thing? Google search didn't provide me with what I was looking for.

PJ Allen
08-14-2011, 03:00 PM
That's definitely in the realm of industrial motor control, electric car stuff.

kwinn
08-14-2011, 05:40 PM
Take a look at these sites for info.

http://www.vsholding.com/datasheets/7147%20H-driver%20All%20voltage.pdf

http://www.alldatasheet.com/datasheet-pdf/pdf/236831/SUTEX/MD7120.html

http://www.robotpower.com/

http://www.cnczone.com/forums/open_source_controller_boards/63620-150v_8a_driver_design_bipolar.html

http://www.mskennedy.com/client_images/catalog19680/pages/files/4227rd.pdf


Unfortunately most H bridges with currents in that low a range are also low voltage as well. As the voltage rating increases so does the current and cost.

PJ Allen
08-14-2011, 07:49 PM
www.instructables.com
Search for "electric car", "electric car conversion", "electric bicycle", etc.
You can see what they're using/doing.

erco
08-14-2011, 09:32 PM
RELAYS! Actually there were MANY low-tech but somewhat successful homebuilt electric car conversions in the 1970s-80s. They would often get a surplus 36V starter/generator motor out of old WW2 aircraft, powered by dozens of 12V lead acid cars batteries switched by contactors and rows of heavy-duty relays that made series/parallel connections.

http://www.evconvert.com/eve/electric-car-motors

Loopy Byteloose
08-15-2011, 08:08 AM
@Erco
Relays? The dilemma is that relay contacts perform much better with AC than DC. At 200VDC and 5amps, it may be harder to find a reliable relay than it is to build a heavy duty MOSfet H-bridge. Why so? The contacts work well with AC because the metal is moved back and forth from one to the other; with DC all the contact metal is moved in one direction.

Take a look at relay contact ratings - Often 5 amps at 250VAC is only good for 5 amps at 24VDC.

But if you must use relays, automotive solenoid relays for starter motors are some of the best value in heavy duty.

Newer Power MOSfets are rated at 250VDC and above And can be used in parallel, unlike older semiconductors.

Tubular
08-15-2011, 10:17 AM
You can get much better performance out of contactors / control relays by connecting their 3 poles in series. For instance on these (http://www.ab.com/en/epub/catalogs/12768/229240/229254/229461/229481/tab6.html) contactors, at 220v DC, and for DC-1 rating (** you need at least DC-3, DC-5, maybe even DC-13 rating depending on your motor and your application), for the fourth contactor from left in the table,
1 pole is rated at 1.5 A
2 poles in series is rated at 8 A
3 poles in series is rated at 25 A

scroll down a bit and you will see, for DC-3 (shunt wound dc motor)
3 poles in series is rated at 6 A

and after that, for DC-5 (series wound dc motor)
3 poles in series is also rated at 6 A

From past experience its really the 'control relays', and contactors before you get sufficient DC performance. There are also 4 main pole versions which are better still.

To be honest, now that we can buy VSDs for $100 that are inverting off a 400vdc bus, I would think there are other solid state solutions, just got to find them.

vsholding
12-04-2011, 07:09 AM
Looking for a module that can handle a motor that I have that draws 5 amps or less. Anyone have a good lead on a supplier or where I can find such a thing? Google search didn't provide me with what I was looking for.

vsholding
12-04-2011, 07:14 AM
HI,
We make many DC Drivers. Please visit my website http://www.vsholding.com or send me email to v_shvartsman@vsholding.com and I will offer you a P/N. I'm working now on a data sheet for a high-speed full-bridge driver.
Thanks, Vladimir