Subject:
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High current speed controllers
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 6 Dec 1997 07:34:18 GMT
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Original-From:
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Thomas Vanselow <vanselow@execpc.STOPSPAMcom>
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Viewed:
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927 times
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Hello,
I was wondering if anyone could recommend a speed controller circuit for
controlling a 12VDC motor which could draw up to 25A. I'd like to use the Handy
Board to control its speed.
Cost is not a big concern but compactness is. I would consider using a
commercial speed controller if I could find one with the foot print about 3"x3".
I've found many speed controllers at the Tower Hobbies web page, but I am not
sure what sort of input these controllers require. Has anyone ever interfaced
the Handy board to a commercial speed controller? It looks like these units are
designed to connect up with RC radio equipment.
Also, can anyone speak to the pros and cons of digital control verse analog? I
seem like many of the speed controllers use PWM techniques for motor speed
control. My application is not really high tech, so I was considering a simply
power transistor circuit. Any thoughts?
Thanks
Tom
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Message has 4 Replies:
 | | Re: High current speed controllers
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| (...) Tom, Try this company , They have single and dual Forward/Reverse proportional speed controls for 4.8 - 140vdc at up to 220 amps and 3 hp. 500oz/in to 27 foot/pound packaged servos. I have a catalog from this company, great stuff but the price (...) (27 years ago, 6-Dec-97, to lugnet.robotics.handyboard)
| | | Re: High current speed controllers
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| Thomas, We are using the HB to control an AstroFligt 50A controller. The controller comes standard with a 20K pot to vary the PWM signal. What I did as substitute the 20K pot with a DallasSimi DS1803 pot. Its a 14 (I think) dip package that uses I2C (...) (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
| | | Re: High current speed controllers
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| I designed a high-current H-bridge to use with my Handyboard (the specs are at (URL) heat sinks on the MOSFETs the bridge can control 50A. (You can substitute fets to get more power). The known problems with this design so far are that the power to (...) (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
| | | Re: High current speed controllers
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| As for your question about controlling a motor with a PWM signal versus an analog level controlled by a power transistor, the issue is efficiency and power dissipation. If you use a power transistor to set the voltage at the motor, it will have to (...) (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
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