Need wheel retraction circuit suggestions

[John Bonnett]

Need some recommendations for a solid-state circuit to control
wheel retraction and extension for an amphibious vehicle in a
marine environment. I'm thinking maybe Hall-effect switches to
trigger a J-K flip-flop at the extremes of travel, but am too dumb
to figure out how to use that to drive the motor in an electric
motor (12 VDC, max 10 amps) to make the wheels go up and down.

Thanks in advance for helping !

 

[Eric]

Need some recommendations for a solid-state circuit to control
wheel retraction and extension for an amphibious vehicle in a
marine environment. I'm thinking maybe Hall-effect switches to
trigger a J-K flip-flop at the extremes of travel, but am too dumb
to figure out how to use that to drive the motor in an electric
motor (12 VDC, max 10 amps) to make the wheels go up and down.

Thanks in advance for helping !

Two proximity sensors, a switch or two and one of those
nano-plcs after that it should just be a simple logic
exercise. (Nano-plc => Siemens LOGO, Crouzet Millenium, etc.)

eric

 

[Joerg]

Hi John

Proximity sensors as Eric had suggested are the ticket. There are some
that are basically oscillators. When their coil comes too close to a
metal object then either their oscillator quits or something detect
enough of a frequency deviation and sends a signal. These can be nicely
encapsulated which is probably a requirement in salt water.

If this is to become a commercial solution it might be good to talk it
over with a company like this one who have experts on board in proximity
sensing:

http://www.turck.de/en/

Regards, Joerg

 

[Eric]

Hi John

Proximity sensors as Eric had suggested are the ticket. There are some
that are basically oscillators. When their coil comes too close to a
metal object then either their oscillator quits or something detect
enough of a frequency deviation and sends a signal. These can be nicely
encapsulated which is probably a requirement in salt water.

If this is to become a commercial solution it might be good to talk it
over with a company like this one who have experts on board in proximity
sensing:

http://www.turck.de/en/

Regards, Joerg

Also, it kind of sounds like the original poster wants to do a component
level design of the control circuit. I think this is way unnecessary unless
he's just doing it as a learning exercise. Black box type solutions (where
you just plug in inputs, outputs and power) are abundant.

eric