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Stepper Motor
Published in Hossam Fattah, LTE™ Cellular Narrowband Internet of Things (NB-IoT), 2021
A stepper motor is an electromechanical device which converts electrical pulses into discrete mechanical movements. The shaft or spindle of a stepper motor rotates in discrete and precise step increments when electrical pulses are applied to it in the proper sequence. The motors rotation has several direct relationships to these applied input pulses. The sequence of the applied pulses is directly related to the direction of motor shafts rotation. The speed of the motor shafts rotation is directly related to the frequency of the input pulses and the length of rotation is directly related to the number of input pulses applied. One of the most significant advantages of a stepper motor is its ability to be accurately controlled in an open loop system. Open loop control means no feedback information about position is needed. This type of control eliminates the need for expensive sensing and feedback devices such as optical encoders. The stepper motor position is known simply by keeping track of the input step pulses. The stepper motor position is known simply by keeping track of the input step pulses.
Introduction to the IoT
Published in Anita Gehlot, Rajesh Singh, Praveen Kumar Malik, Lovi Raj Gupta, Bhupendra Singh, Internet of Things with 8051 and ESP8266, 2020
Anita Gehlot, Rajesh Singh, Praveen Kumar Malik, Lovi Raj Gupta, Bhupendra Singh
A stepper motor rotates in the steps with a minimum step angle of 1.8 degree. The number of degrees the shaft rotates with each step (step size) varies based on several factors. There are two types of stepper motor: unipolar and bipolar.
Control of Synchronous and Special Motor Drives
Published in Vinod Kumar, Ranjan Kumar Behera, Dheeraj Joshi, Ramesh Bansal, Power Electronics, Drives, and Advanced Applications, 2020
Vinod Kumar, Ranjan Kumar Behera, Dheeraj Joshi, Ramesh Bansal
A stepper motor is an electromechanical device that actuates a train of step-angular movements in response to a train of input pulses on a one-to-one basis. This means that the motor moves one step for one input pulse. It is a digital-controlled motor, and the rotational speed is determined by the frequency of the applied pulses, and therefore, the speed of response is very high (10,000 full steps per second).
Virtual commissioning for an Overhead Hoist Transporter in a semiconductor FAB
Published in International Journal of Production Research, 2020
Joo Y. Lee, Kwanwoo Lee, Sangchul Park
The main mission of an OHT is to move a FOUP from a starting point to a destination point, and it consists of four major steps; (1) Move to the starting point in an empty state, (2) Load a FOUP at the starting point, (3) Move to the destination point with the FOUP, and (4) Unload the FOUP at the destination point. Among the four steps, the FOUP loading and unloading steps require many tasks from shutter, slide, hoist and gripper. An OHT device has multiple motions requiring actuators such as ‘servo motors’ and ‘stepper motors’. While servo motors are used for precise control requiring feedback sensors (closed-loop control), stepper motors are suitable for less precise control without feedback sensors (open-loop control). Typically, an OHT has four servo motors (two for driving, one for slide, and one for hoist) and two stepper motors (one for shutter and one for gripper). Each motor has corresponding tasks. By analysing those tasks, we identify nine tasks, as shown in Table 1.