Alternate to a proportional linear solenoid

AI Thread Summary
The discussion focuses on creating a circuit that replicates the function of a proportional linear solenoid using gears, motors, and relays. The user is exploring design options and has encountered challenges with a cam follower mechanism. Key insights suggest that typical DC motors follow current for torque and voltage for speed, but may struggle with consistency due to stiction. Recommendations include using high-quality motors, such as servos or steppers, along with spur gears and racks to achieve the desired motion. The conversation emphasizes the need for precise motor control to effectively mimic solenoid behavior.
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I am trying to build a circuit using gears, motors, and relays only which mimics the motion of a proportional linear solenoid i.e. Hold a spring compressed at a certain distance depending on the current passed, and push/ release it further based on the increase/ decrease of current. (V=12 V, Spring Force in Kg = 25, distance = 10 cms). For now, I am seeking help in the design, what to use and how to use.

I am trying to use a cam follower mechanism but it doesn't work out. Can you please help me out in this regard?

Thanks in advance
 
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For your typical DC motor, the shaft torque will follow the current, and the motor free speed will follow the applied voltage. The torque will also dip as the motor's shaft angle varies. Some high quality motors (like Maxon) are designed to have a more consistent torque versus angle. You will also have all the difficulties that stiction bring. With a good quality motor, a spur gear, and a rack it should behave somewhat like a solenoid drive.
 
I don't see how you do this with a "normal" motor unless you are running it "stalled". You need a servo or stepper motor, I think. Am I missing something?

http://en.wikipedia.org/wiki/Servomotor
 
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