 | | High current speed controllers —Thomas Vanselow
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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 (...) (27 years ago, 6-Dec-97, to lugnet.robotics.handyboard)
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| | | | | Re: High current speed controllers —Terry P. Gathright
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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)
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| | | | | Re: High current speed controllers —Bruce Moore
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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)
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| | | | | Re: High current speed controllers —Chuck McManis
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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)
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| | | | | | | Re: High current speed controllers —Chuck McManis
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| | | | | | Whoops, the url for my H-bridge design should be: (URL) previous version was missing the 'robotics' in the middle. Thanks to Mike for pointing that out. --Chuck (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
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| | | | | Re: High current speed controllers —Mike Vande Weghe
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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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