Sanyo Denki
2010
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Sanyo Denki
Joseph Mark Wexler Urging Companies to Examine and Reduce Their Carbon Footprint
Rancho Santa Margarita, California; January 13, 2011 - Joseph Mark Wexler is working hard to help companies efficiently reduce their carbon footprint and is urging all companies to consider the impact their operations have on our environment. Joseph Mark Wexler is encouraging companies to realize the value of their corporate image and is reaching out to demonstrate his ability to help.
Joseph Mark Wexler has passionately dedicated himself to do his share to help reduce the progression of global warming. Through his background as a mechanical engineer and extensive experience as a sale engineer, Joseph Mark Wexler has not only assisted his customers in reducing their power consumption, but has also been successful in increasing sales volume 2 to 3 times for the companies he has collaborated with.
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Cooling: The ever increasing capacity requirements of data centers for companies such as Face Book, Google, Cisco, and a variety of others has created a massive electric power need which will only increase over time. Joseph Mark Wexler strategically aligned himself with the Sanyo Denki Company in order to provide cooling systems which reduce their customer's power consumption to the bare minimum effectively minimizing the carbon footprint of the company's data centers.
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For additional information, contact:
Joseph Mark Wexler
8 Santa Nella
Rancho Santa Margarita, CA 92688
949-547-2667
jmwexler ( @ ) yahoo dot com
http://www.linkedIn.com/in/josephmarkwexler
Source:
http://www.1888pressrelease.com/joseph-mark-wexler/joseph-m-wexler/joseph-mark-wexler-urging-companies-to-examine-and-reduce-th-pr-271399.html
About the Author
http://www.linkedin.com/in/josephmarkwexler
driving stepper motors problems?
I am using an at89c2051 to drive a stepper motor (h546 from sanyo denki). The motor is connected to an l293d which is directly connected to pins p2 to p5 of the mcu. However I am having a big problem with the motor - when the motor is spinning, sometimes if i try to read some input pins these are read as high even though physically these are grounded. I am thinking that the problem could be from noise coming from the motor and somehow propogating to the mcu - do you think this is the case? If so I might try using some photocoupler isolator such as the pc845. Moreover since I am not using any protection diodes could this be a problem of back emf? But the l293d should have these diodes internally, right? Or could it be that this problems is because my motor requires more current than the l293d can source? if so what can I do?
thanks
The optocoupling won't solve your problem I think. But I assure you it CAN be solved, if you pay attention to three things: current loops, spike control and coupling elimination. In a previous life I worked on daisywheel printers which use steppers, solenoids, motors and low-level optical resolvers - all routed together in flexible cable. And it all worked fine.
First, you need to isolate the stepper driver on its own supply loop. Star-tie its power and ground back at the supply, separate from the MCU. You can also filter the motor supply to catch differential and common-mode noise.
Next, you can also slow down the edge rate to the driver using an RC damper. This will reduce the spikes. Very important. Also consider using a lighter "hold" voltage when the stepper is parked vs. when it's operating. This will save considerable power.
Also, it looks like they recommend additional freewheeling diodes in the data sheet (link below). These will help catch the back-emf locally closer to the motor. I'd say it's a good idea (I've always seen them used.)
Finally, examine the routing of your sense wires. Are they subject to noise coupling from the motor wires? If so, you can reroute them or shield them. Ground them back at the MCU and also provide their supply from the MCU too. This prevents forming another current loop.
Another measure you can use is current-mode or differential signaling to reject common-mode noise. You will need some kind of buffer for that.
Sanyo Denki 6000 RPM with home made 5V PWM Fan controller. Thanks bing!
