Dienstag, 5. November 2019 - keine Kommentare
There are four types of industrial automation motor loads:
Variable horsepower and constant torque
Variable torque and constant horsepower
Variable horsepower and variable torque
Positional control or torque control.
Variable horsepower and constant torque applications include conveyors, cranes, and gear-type pumps. In these applications, the torque is constant because the load doesn't change.
The required horsepower may vary depending on the application, which makes constant speed ac and high speed high torque bldc motor a good choice.
An example of a variable torque and constant horsepower application is a machine rewinding paper. The material speed remains constant, which means the horsepower doesn't change. The load does change.
In small systems, this is a good application for dc motors or a servo motor. Regenerative power also is a concern and should be considered when sizing the linear step motor or choosing the energy control method.
Stepper motor with encoder, closed-loop control, and full quadrant drives may be beneficial for larger systems.
Montag, 4. November 2019 - keine Kommentare
Stepper motors are unique among electronic motors in that they move in a series of discrete steps (hence their name) rather than a continuous motion. This is a useful property since it allows steppers to have positional and velocity control that is both accurate and easy and doesn’t even require feedback to maintain (under normal operation).
However, one of the primary disadvantages of this style of motor comes as a direct result of this discrete nature and open loop control.
Since steppers are typically run in open loop, the controller has no knowledge of these missed steps; The result is the motor will not get to its destination successfully. The effect can become so pronounced that the nema 23 stepper motor loses torque completely and stops rotating. Depending on the synchronization of the steps, it can even reverse the direction of rotation.
First, this phenomenon is only problematic at the stepper’s natural frequency. This means that it will only be at work in a certain velocity band. Depending on what speeds you are running your motor at, you may never even notice it at all!
Second, the resonance takes time to build up. It’s not like you will hit a bad velocity and immediately lose torque. The oscillations will take a few seconds to get to the troublesome levels. Since this issue only crops up at certain velocities, you can typically accelerate through a bad region and emerge unaffected on the other side. You are only at risk if you are staying in the bad region for extended periods of time. (Click here to buy cnc stepper motor kit)
Finally, this effect is greatly reduced by having load on the motor. If the motor has load on it, then the inertia is much greater and the oscillations will be reduced substantially.
Montag, 21. Oktober 2019 - keine Kommentare
NEMA 17 is the most common size for stepper motors used in 3D printers. They can be designed and manufactured to have different mechanical and electrical specifications to suit the 3D printer that you want to build.
So, How do you choose the right motor for 3D printing?
A high torque NEMA 17 stepper motor that can provide 200 steps per revolution (1.8-degree step angle) is one of the options to consider for 3D printers. Be sure to check the model and specifications of your 3D printer before you buy a NEMA 17.
Some companies can manufacture and design custom NEMA 17 stepper motors for your 3D printer. You can choose different lead wires and include lubricant and bearing options in case you need parts for high temperature and humid operations.
You can order NEMA 17 steppers online at this website “https://www.oyostepper.com/”. Look for a reputable supplier of small electric motors with years of experience working for a range of industries. This way, you can be sure to get high-quality stepper motors at the right size.
Montag, 21. Oktober 2019 - keine Kommentare
Stepper motors are brushless motors that use multi-toothed electromagnets to define the position. The electromagnets are fixed around a centralized gear. NEMA numbers define the standard dimensions of a faceplate for mounting a motor. NEMA 17 stepper motors are stepper motors with a 43.2mm x 43.2mm (1.7 inch x 1.7 inch) faceplate. They are heavier and larger than a NEMA 14 stepper motor, but their size is what ensures more room for higher torque. NEMA 17 is the most common size for stepper motors used in 3D printers. They can be designed and manufactured to have different mechanical and electrical specifications to suit the 3D printer that you want to build.
When looking for a NEMA 17 stepper, remember that the name is merely the frame size standard, which defines the dimensions of a mounting faceplate. You need to make sure that you are getting the right stepper based on the motor’s electrical specifications.
Some companies can manufacture and design custom NEMA 17 stepper motors for your 3D printer.
Custom NEMA 17 stepper motors are ideal for custom 3D printer applications that require a specific lead length, shaft size, frame size, or body length.