Can a Hydraulic Stepper Motor Step 90 Degrees in 25 Milliseconds?

In summary, the conversation is about the possibility of using a hydraulic stepper motor for a specific application. The participants discuss different options, such as using electronically controlled valvegear or a vane motor with a valve on inlet and exhaust, but it is mentioned that there are no hydraulic steppers readily available in the market. Some suggest using a 4-piston pump as a motor, while others suggest using a linear hydraulic actuator with a pulse width modulated control valve. The purpose of the stepper motor is to continuously index quarter steps at a rapid pace.
  • #1
wolram
Gold Member
Dearly Missed
4,446
558
Is there such a thing? i have had a search but found nothing, i can think of a way that one would work, but i need one that can (step) 90 degrees in 25 milli seconds and hold possition until the next step is called for.

anyone that can help will be rewarded with one of my fantastic chili cakes.
 
Engineering news on Phys.org
  • #2
As far as I'm aware, not as such. However, I've seen applications using some nifty electronically controlled valvegear to control a hydraulic motor by using a position sensor on the motor to feedback to the controller. Will have a dig around.

Is this the same application that you were querying your mutilated gears for a while ago? Chilli cakes sound good.
 
  • #3
I got to enter the contest just because I love chili. Never had it on a cake, but I'll try anything.
Does it have to be a stepper motor? Would a piston-actuated ratchet wheel work?
 
  • #4
Danger said:
I got to enter the contest just because I love chili. Never had it on a cake, but I'll try anything.
Does it have to be a stepper motor? Would a piston-actuated ratchet wheel work?

I do not think so Danger, i need to index quarter steps continuosly, i guess i could use half or even full 360 with gearing ,but i want to keep it a simple as poss, Brewy has the idea ,the way i would do it would be to have a vane motor with a valve on inlet and exhaust with a feed back sensor to vary the signal pulse lengh to the valves, or some such, the (motor) volume would have to be quite small as 25 milli secs is rather rapid.

It is the mark three Brewy.
 
Last edited:
  • #5
Hmmm... not sure about response time, but maybe something like a 'Geneva wheel' attached to the motor shaft as your position sensor/valve actuator?
 
  • #6
I have never seen a stepper motor tht was hyraulic. However there is a fair amount of motion control that is hydraulic based. Check with companies like Moog.
 
  • #7
FredGarvin said:
I have never seen a stepper motor tht was hyraulic. However there is a fair amount of motion control that is hydraulic based. Check with companies like Moog.
Thanks Fred, Danger, i have gone through thousand of (product) pages with no luck, it seem pnuematic and hydraulic devices are images of one another, neither have a stepper design i can find, (why) there must be a reason, would they be so difficult to make?
May be i could make one but where to start, seals would be a major part as would fluid flow times. :confused:
 
  • #8
It just occurred to me that perhaps the lack of hydraulic steppers has to do with the shock loads of a high-pressure system starting and stopping so rapidly and repeatedly. I would suspect that there would be a lot of stress on the components. While you stated 25ms as the needed response time, you didn't mention how often it has to step.
 
  • #9
Danger said:
It just occurred to me that perhaps the lack of hydraulic steppers has to do with the shock loads of a high-pressure system starting and stopping so rapidly and repeatedly. I would suspect that there would be a lot of stress on the components. While you stated 25ms as the needed response time, you didn't mention how often it has to step.

Approx 40 times a minute, which i think is not over the top, some manufacturers are using hydraulicaly opperated valves on ic egines at
15000 rpm and they lift 6mm.

www.sturmanindustries.com/main/valvesActuators.htm[/URL]
 
Last edited by a moderator:
  • #10
Well, that would apparently negate that explanation.
 
  • #11
Parker Rexroth?
 
  • #12
I think the problem i have is that what i want falls between a motor and a actuator, and no one has ever had a need for hydrulic stepper, i think if i want to continue this idea i will have to make my own, (even though i have no idea how to yet) :smile:
 
  • #13
Hey... does this thing continously step in the same direction, or is it reversible?

edit: Actually, never mind that; it doesn't matter. Just an example of things running through my head while I'm trying to come up with something. So... here goes. I have no diagrams or tech data or anything else on hand right now, so I'm just going by memory here. I'm wondering if you could use a 4-piston pump (the kind with a swash-plate) as a motor. Blasting oil into it for long enough to 'compress' one piston should result in 90 degrees of rotation, right? Obviously, this is just an off the top of my head thing, and I won't have a chance to really think it out until at least after I get home tonight.
 
Last edited:
  • #14
I think you are simply looking for an actuator. We have used linear hydraulic actuators and precisely controlled the position with a pulse width modulated control valve and position feedback.

By definition, a stepper motor is an elctric device.

Why do you need a stepper motor? Why not use an electric one?
 
  • #15
FredGarvin said:
I think you are simply looking for an actuator.
I already tried that one; he didn't buy it.
 

1. What is a hydraulic stepper motor?

A hydraulic stepper motor is a type of motor that uses pressurized fluid to generate rotational motion. It is often used in applications where precise control of movement is required.

2. How does a hydraulic stepper motor work?

A hydraulic stepper motor works by using a series of pistons and cylinders to create movement. The flow of fluid through these pistons and cylinders causes the motor to rotate in small, precise increments.

3. What are the advantages of using a hydraulic stepper motor?

One of the main advantages of a hydraulic stepper motor is its ability to provide precise and consistent movement. It also has a high torque output, making it suitable for heavy-duty applications. Additionally, it can operate at high speeds and can be easily controlled through a hydraulic system.

4. What are the common applications of a hydraulic stepper motor?

Hydraulic stepper motors are commonly used in industrial and manufacturing settings for tasks such as positioning, indexing, and driving conveyor systems. They can also be found in medical equipment, robotics, and aerospace technology.

5. How do you choose the right hydraulic stepper motor for a specific application?

When choosing a hydraulic stepper motor, factors such as torque requirements, speed, and precision must be considered. It is also important to ensure that the motor is compatible with the hydraulic system being used. Consulting with a specialist or manufacturer can help in selecting the appropriate motor for a specific application.

Similar threads

Do I need a 360 servo or stepper motor?
    • General Engineering
Replies
4
Views
3K
3D Printer Stepper Motor Torque Requirements Using Gear Reduction
    • Mechanical Engineering
Replies
1
Views
1K
How can I achieve higher speeds when running stepper motors?
    • Electrical Engineering
Replies
5
Views
1K
Microstepping, Gearing, and Torque
    • Mechanical Engineering
Replies
2
Views
1K
Compiles, and motor driver shields work individually--but not together
    • Programming and Computer Science
Replies
1
Views
1K
Motorized rotating platform (180 degrees, periodically)
    • Mechanical Engineering
Replies
2
Views
2K
Controlling a stepper motor-basic equipment
    • Electrical Engineering
Replies
1
Views
1K
Stepper motor stepping uniformity
    • Electrical Engineering
Replies
4
Views
3K
Using a motor to move something 90 degrees
    • Mechanical Engineering
Replies
5
Views
2K
Slowly Rotating Device For a Camera Pan Timelapse
    • Mechanical Engineering
Replies
12
Views
2K

Hot Threads

Recent Insights

Back
Top