Stepper Motors: Principles and Characteristics

1988 ◽  
Vol 202 (2) ◽  
pp. 111-117
Author(s):  
J R Cooke
Keyword(s):  
Motor Drives ◽  
Stepper Motor ◽  
Servo Motor ◽  
Basic Principles ◽  
Stepper Motors

The basic principles of stepper motors are explained. Under certain circumstances it is shown that a stepper motor may be a better option than a servo motor. The three most common types of stepper motor are described and their important characteristics are illustrated and explained. Finally, the principles of stepper motor drives and the various types available are analysed.

scholarly journals Distributed Cooperative Control for Stepper Motor Synchronization

2018 ◽  
Vol 167 ◽  
pp. 02001
Author(s):  
Sauro J Yague ◽  
Guillermo Reyes Carmenaty ◽  
Alejandro Rolán Blanco ◽  
Aurelio García Cerrada
Keyword(s):  
Cooperative Control ◽  
Control Algorithm ◽  
Torque Control ◽  
Stepper Motor ◽  
Two Phase ◽  
Control Techniques ◽  
Control Effectiveness ◽  
Stepper Motors ◽  
Distributed Cooperative Control ◽  
Multi Agents

This paper describes the design and simulation of a distributed cooperative control algorithm based on multi-agents to synchronize a group of stepper motors. Modeling of the two-phase hybrid stepper motor in closed loop is derived in {d - q} rotary reference frame, based on field-oriented control techniques to provide torque control. The simulation obtained by MATLAB-Simulink shows that the distributed cooperative control effectiveness depends on the network topology defined by the graph.

Investigation of Vial Position Controls for the Development of a Cave Auto-Sampler

2018 ◽  
Vol 884 ◽  
pp. 86-92
Author(s):  
Raul Jangali ◽  
Shen Hin Lim ◽  
Adam Hartland
Keyword(s):  
Position Control ◽  
Power Saving ◽  
Gear Ratio ◽  
Stepper Motor ◽  
Sample Collection ◽  
Drip Water ◽  
Airtight Container ◽  
Arduous Task ◽  
Stepper Motors ◽  
The University

Researchers at the University of Waikato visit caves on a periodic basis to collect samples of drip water, which over geological timeframes form stalagmites and other formations. However, most caves are remotely located, which makes it an arduous task to reach the study site and is economically unfeasible for frequent visits. This paper presents the position control aspect of the cave auto-sampler, which is a crucial operation to store water samples in an airtight container. The primary challenge was to position airtight sample vials under the needles for sample collection, within 3.5mm from the centre of the silicone septa. Various methods and makes of stepper motors were tested to find the balance between precision and power saving. A high gear ratio stepper motor was chosen as the primary drives due to its high precision and its ability to hold position when power is turned off between operations. Testing in lab conditions showed satisfactory consistency regarding position control and is integrated into the auto-sampler.

Servomechanical Press: A New Press Concept for Semisolid Forging

2008 ◽  
Vol 141-143 ◽  
pp. 261-266 ◽  
Author(s):  
Zigor Azpilgain ◽  
R. Ortubay ◽  
A. Blanco ◽  
Inaki Hurtado
Keyword(s):  
Motor Drives ◽  
Servo Motor ◽  
Forging Process ◽  
Ac Servo ◽  
Shrinkage Defects ◽  
The Press ◽  
Mechanical Press ◽  
Ac Servo Motor ◽  
The University ◽  
A356 Aluminium Alloy

Semisolid forging process requires special movement of the ram, until now only achievable with hydraulic presses. The upper die, placed on the press ram, must move fast during forming of the component in order to reduce segregation phenomena, and, once the part is shaped, the die must squeeze the material so that the contraction of the material is overcome and no shrinkage defects are formed. Traditional mechanical presses are not able to reproduce this kind of cycles, only possible with hydraulic presses. The introduction of servo motors in mechanical presses makes possible the achievement of those requirements, and, therefore, the use of these presses for the semisolid forging processes. The main characteristic of this type of machines is the elimination of the flywheel and the clutch; in the solution proposed by the press builder Fagor, the AC servo motor drives the ram of the press by using a transmission based on gears and a crank. This paper presents some of the results achieved during the semisolid forging of A356 aluminium alloy using a 400 tons Fagor servo motor driven mechanical press installed at the University of Mondragon.

Experiments in the Commutation and Motion Planning of a Spherical Stepper Motor

2000 ◽  
Author(s):  
David Stein ◽  
Gregory S. Chirikjian
Keyword(s):  
Motion Planning ◽  
Small Area ◽  
Permanent Magnets ◽  
Difficult Problem ◽  
Experimental Results ◽  
Stepper Motor ◽  
Stepper Motors

Abstract This paper addresses the commutation and motion planning of a spherical stepper motor in which the poles of the stator are electromagnets and the poles of the rotor (rotating ball) are permanent magnets. The stator only overlaps a very small area of the rotor, leading to a design that has a much wider range of unhindered motion than other spherical stepper motors in the literature. The problem with having a small stator is that it makes commutation and motion planning a difficult problem. We first explore the techniques and model used to construct the proper sequence of stator activations that result in the desired rotor trajectory. Experimental results are then presented for the model and prototype we have constructed.

scholarly journals Concept and modelling of the electrohydraulic valve with DC and stepper motors

2019 ◽  
Vol 252 ◽  
pp. 06003 ◽  
Author(s):  
Dominik Rybarczyk
Keyword(s):  
Hydraulic Drive ◽  
Dc Motor ◽  
Stepper Motor ◽  
Proportional Valve ◽  
Positioning Accuracy ◽  
Accuracy Requirement ◽  
Stepper Motors ◽  
New Type ◽  
Drive Systems ◽  
Electrohydraulic Valve

The article describes concept and modelling of a new type of electrohydraulic valve controlled by the combination of a stepper motor and a DC motor. The aim of this invention is to use in the proportional valve two motors with the different properties. Both motors are responsible for the movement of a valve spool. The stepper motor and the DC motor are connected to a shaft by using a bellows coupling. Transfer from rotary to linear motion is performed by use of a bolt-nut system. According to the invention, presented here valve can be used in hydraulic drive systems with high positioning accuracy requirement. The author was granted a patent no. P.421994 on the invention described in this paper.

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