On Sunday 29 March 2015 07:13:54 kqt4a...@gmail.com wrote: [...] Locally, Lowes sells them for about $35.
> No IR thermometer > I ran the motor on 12 volts for about 1 hour and the chip was only > barely warm to touch Then I ran the motor on 36 volts for about 1 hour > and the chip was only barely warm to touch The 36 volt power supply is > close in the same container so I disconnected it and ran the motor on > batteries Same results the motor is very weak I wasn't referring to the chip temps, I was more interested in the motors temp, which being a relatively massive item to heat, taking a boring amount of time to reach a stable operating temp, a temp thats quite likely to be too hot to touch comfortably. But either you didn't notice because it wasn't getting "too hot"., or didn't feel it for heat. They will run hot, uncomfortably hot in normal operation. And contrary to what somneone else said, the driver components will actually run cooler at the higher voltages because most of them are "hexfets" with on resistances measured in milliohms and at the high voltages spend less time in the on state to reach the regulated current point at the higher voltages, they will actually run cooler as the voltage rises, up to the rated voltage. Because of the higher on time at lower voltages, the 2M542 driver is not recommended to be run on less than 24 volts. This is a 50 volt rated, max of 4.2 amps driver available on fleabay, for less than $50 a copy. When I fried the 3rd xylotex, I bought 7 of them, 3+ years ago, 2 for my lathe and 4 for the mill since it can also have a rotary table. The 7nth one has now been used as a test mule, set for a /8 stepping, driving a 425 oz/in triple stack nema 23 motor at speeds up to 3000 rpms on a 47 volt supply, long enough to prove it can do it. The motor gets hot, but the driver is running maybe 5 degrees above ambient, at 1/2 its max amps rated output as the test motor is an 8 wire, wired in series. You haven't said, other than you built them yourself, what your driver is, so we are all in the dark trying to read between the lines. Perhaps you can supply a link to where you obtained the schematic for it? I am a CET, and perhaps might be able to see why its not working as advertised. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
