Controlling the Linear Voice Coil Actuator

http://acm-magnetics.com/acm/pdfs/15-BasicsOfVCMs.pdf

Thank you, but i found this earlier than I sent my question.

It's controlled by a switching power supply and an amplifier.Good luck.

Thank you, but I knew about this earlier, than I sent my question.

This is what they make vibration test system out of, here is one manufacturer:

http://vts2000.homestead.com/files/multiv.htm

The speed of the stroke and the mass to be moved are critical to the size of the system you need. A lot more detain would be needed to suggest further.

Here's where to go:

Shakers and Accessories, Electrodynamic Shaker Systems ...

Think those are all short-stroke, high-force jobs (but I could be wrong). Here are some longer-stroke ones (still begging the OP's request for control systems - to use as positioners, they'd need feedback):

http://www.pwr-con.com/linear-motor-with-bearing.htm

Thank you, but this is obvious.

The OP does have a fundamental question. It is real. How do you keep a voice coil from essentially exploding at excessive amplitudes, as far as you desire?!!?

Physically, you do not (keep it from mischief).

Actually, the voice coil force generator is INSEPARABLE from the movement amplitude, until a definite negative feedback introduced.

If you do not get it: It is not worth sh*t, until you get it under control, iffy even then.

Capiche?!?

What is the proposed application?

Hello, thank you for this first and logical question.

So, this has to be silent electric drive for the piston, with electronic stroke regulator, controling a speed of the linear motion, with adjustable change of initial & end position of the piston.

Output power is low , therefore I chose a small mass and a moving coil only.

So I'm looking for a ready solution to the task.

A voice coil is basically another form of loud speaker, so audio amps can drive it with various waveforms, but if you need to be able to hold it in a particular position, you will need a DC coupled amp.

Yes, the data sheet brought back memories of open reel tape drives to mainframe computers. They had multiple, nestled feedback loops to have all those spindles , capstans humming right. That kind of design needed teams of good engineers, and not one amateur among them.

But, nowadays, having only one lightly loaded (whatever that is) actuator to be moved up to 6" I would use off-the-shelf components with stepper motor microstepped, and be done with. It may take some learning, allright.

A stepper motor (micro stepper) is too slow.

Here you need a fast-moving six inches during the 50 msec

My project need use this actuator as is shown there:

http://www.pwr-con.com/docs/lvcm-051-165-01.pdf

although stroke is a little bigger.

I need a complete solution, including the schema, interface and the program.

This has no position sensing device for feedback to the control system. How do you intend to measure the position?

By linear encoder (magnetic ruler) mounted on head and frame body.

Have you contacted any manufacturers yet?

Yes, but ready solutions are to expensive as to my design.

I need do it much simpler and cheapest as possible.

Nobody of them want not to disclose an electronic scheme and software for steering.

How much time do you have to reinvent the wheel here and what is that time worth?

What is the practical/commercial objective for making this coil and its associated piston move in a controlled manner?

You still have to sort out the positioning feedback unless you are just slamming the coil back and forward against mechanical stops.

Is this part of a plan to build a tool for world domination on the cheap or what?

Thank you for your time, you spent for this topic's disscussion.