Questions tagged [linear-motors]

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1 vote
54 views

Method to achieve a constant force no matter the actual velocity when under load

So, this might be a somewhat strange need, as I don't seem to see many resources on this. I'm trying to create a device where I can set an amount of force for it to generate, and when it would behave ...
25 views

Design of a 3 Phase Linear Induction Motor

I am a Mechanical Engineer but need to use a 3 Phase Linear Induction Motor (LIM) for a MagLev project. To demonstrate the working of LIM I need to design LIM for accelerating a 10 kg payload to ...
1 vote
27 views

Linear actuator that extends more than its retracted size

I'm trying to build my standing desk and has been studying a lot of them, but have not found a CAD or Technical Drawing of them mechanism. Obviously, as an Engineer, I assume that it uses a Lead Screw ...
1 vote
28 views

What motors would be suitable for linear actuation in 1-2mm footprint?

I need to control simple braille (text for blind people) array with tiny rods. I don't necessarily have to control the precise location. A linear actuator with on/off states would be enough. However, ...
• 11
20 views

How to design a fast moving tilt table capable of lifting and holding 35kg/75lb?

I have a rectangular table about 0.5m(20") x 1m(40"). I need to lift one end of it, similar to a tilting table using something like a linear actuator (think CNC Z-axis). The load is fairly ...
1 vote
66 views

Lifting a table using linear rails and linear actuators

I'm trying to design a coffee table for a tightly constrained space that can lift up to become a dining table. I've drawn the CAD for this design, but I'm concerned that the moment arm on the linear-...
55 views

Looking for a linear actuator that can carry a transverse load? Does such a product exist?

I am looking for a product that works like a linear actuator where you can control how far it extends but it can also hold a transverse load at the furthest point of extension. What I am looking for ...
31 views

Need a solar powered mechanical motor? that moves a leaver up and down low force and little distance on day/night

I'm planning to use barrels full of water to make a drip watering system. I can make the water controls from a pretty easy toilet fill&flush valves and balance it so it needs a very light push on ...
36 views

Design of a linear actuator that is only 5 mm wide

I have to design a linear actuator with a maximum movement of 3 cm back and forth and a maximum force of 5 N. The only constraint I have is that it can only be 5 mm wide. There's no real constraint ...
110 views

Torque on motor shaft when shaft is rotated manually

The motor shaft is connected to a flywheel which is rotated manually to achieve a certain speed. Now when motor is switched on, how will it impact the shaft? Will motor whole power goes into ...
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44 views

Finding the right stepper motor holding torque for and X and Y gantry pick and place moving back and forth

X axis Force = mgu M = mass of plate g = gravity u = coefficient of friction (7kg)(9.81m/s)(0.5) = 34N Torque = fxd F = force d = radius of pulley T = (34N)(4mm) = 136 mNm (**Stepper Motor, NEMA 17, ...
145 views

How do I calculate the total force required for a linear actuator? [closed]

How do I calculate the total forcerequired for a linear actuator? The image enclosed shows a series of door panels, each with a cam that i would like to connect to a linear actuator on the right hand ...
58 views

Motor Power for vertical lift in linear slide mechanism

I want to pull up and down 10 kg metal cylinder at 7 inch vertically by using linear slide mechanism in 1 second. What should be the motor rpm, gear type, torque, watt etc? Otherwise how to calculate ...
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1 vote
90 views

Linear motion with triangle profile

I am looking for a way to generate a linear motion with a triangle motion profile for my hobby project. The travel distance should be 6cm (so 12 cm for round-trip) with constant speed 1.2 m/s or ...
44 views

Linear Actuator Power

I have a linear actuator that I'm using two relays (Wired as a h-bridge) to control the movement of my actuator. Is it ok to leave power to it all the time, or do I need to cut the power once it ...
3k views

How do I calculate the ideal travel distance of the ball screw per revolution of the stepper or per step for the following hardware?

Question How do I calculate the ideal travel distance of the ball screw per revolution of the stepper / per step for the following hardware (I believe this is called the lead)? Background I have a pre-...
1 vote
122 views

Selecting the right DC motor for horizontal motion

I have come across a problem that for the life of me I can't seem to figure out. I'm sharing this here in the hopes that the amazing community here can help push me in the right direction. The problem ...
180 views

Single linear actuator lifting mechanism

I have inherited a DIY build and I have some doubts about its design. Have a look at the following diagram: 1 is the linear actuator. It's quite beefy 2000 lbs 12" stroke. It is installed in an ...
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1 vote
146 views

CNC side linear rails

I've been wondering why most (hobby) CNC machines have two actuated linear rails like this: Besides the extra force for moving the spindle, is there a need for both rails to be actuated? Could the ...
• 1,033
410 views

Off-centre actuation

I'm trying to lift a platform with several guides using a linear actuator, but off the centre as follows: The load on the platform will be around 100kg, which is just within the linear actuator's ...
• 1,033
1 vote
85 views

Linear actuator with low vibration and low noise

Which kinds of linear actuators offer the lowest levels of noise and vibration? I am looking for an actuator with these properties that can push a load vertically on the cm scale. Velocity, accuracy ...
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1 vote
309 views

Sizing a motor for a floor jack-like mechanism

I've been trying, as a thought exercise, to run some calculations on a floor jack-like mechanism that is expected to lift 130kg (287 lbs). Dimensions and setup are as per the image below. The 130kg ...
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1 vote
152 views

Is it possible to have the load cell signal as feedback to the servo drive of the servo motor?

In my project, I have to control the linear motion in one of the two modes. It will be either in position control or load control. for the displacement control, The servo motor takes the quadrature ...
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1 vote
2k views

Can linear actuators be moved manually?

I've watched a few videos explaining how actuators work and it seems to me that a regular, non-blocking, actuator would freely move if not powered. But theory and practice are rarely the same thing. I'...
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34 views

Is it possible to simulate the electric power output of a linear alternator using finite element analysis software?If yes, which?

We need to build a small (1-2W) linear alternator for a project in engineering school. Is it possible to use finite element software to finetune our design instead of actually building real life ...
1 vote
66 views

Performance of RC car under different gear ratio, measured data vs hypothesis

Assuming the driveshaft of the rear wheeled drive RC car follows the linear DC motor theory for stall torque and no-load RPM, also voltage supplied is constant and no inductance as well. Note: the ...
1 vote
156 views

shock-resistant electromechanical linear actuator?

I was wondering, if there is a shock load resistant electromechanical actuator that can withstand powerful impacts? Is there an electromechanical counterpart for pneumatic cylinders that is as ...
96 views

Need to produce vibration amplitude of 200 um (approx) at natural (resonant) frequency, can be any frequency between 100 to 150 Hz

In order to conduct study, I need to produce controlled vibrations with amplitude (maximum) approx 200 um (micro) at frequency between (100-150) Hz. Vibration amplitude must be controlled with input ...
172 views

Voltage controlled linear actuator with spring back

I have a machine/robot that has a manual joystick to control forward and reverse. The joystick is connected to a mechanical linkage system that goes forward/backward, which than controls a hydraulic ...
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62 views

How to vary the force output of a motor while stalled?

I want to provide a gradual increase in force provided to a piston (perhaps 0-100N over the space of a couple of seconds maximum), up till the point it begins moving, and then drive it to a varying ...
299 views

What is this contraption?

If this is the wrong place for this question, please migrate it to someplace where it's more suitable. So one of my old teachers from my previous school sent me a contraption to try and figure out ...
• 143
1k views

Do linear actuators need to stay powered once in place? If not, how can I lock them?

I want to build a small remote-controlled submarine, and have been thinking about how to handle the ballast tanks. The simplest option seems to be a piston shaft, which fundamentally needs some kind ...
• 165
6k views

Reading stepper motor datasheets to get torque and speed

I don't understand how to use the information in a stepper motor datasheet to understand how much torque it can generate. I was going to do a simple board and try to lift a small weight as an example ...
• 549
2k views

How does a rodless electrical linear actuator work?

I want to pull some weight horizontally and for that i have settled for a linear actuator. The actuator should pull some weight as it moves back and forth as the gif shows. There are linear ...
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