LITERATURE REVIEW

JOURNAL 3

STEPPER MOTOR 

A stepper motor can be a good choice whenever controlled movement is required. They can be used to advantage in applications where you need to control rotation angle, speed, position and synchronism. Because of the inherent advantages listed previously, stepper motors have found their place in many different applications. Some of these include printers, plotters, high end office equipment, hard disk drives, medical equipment, fax machines, automotive and many more.

Advantages:

• The rotation angle of the motor is proportional to the input pulse. 
• The motor has full torque at standstill. 
• Precise positioning and repeatability of movement since good stepper motors have an accuracy of 3 – 5% of a step and this error is non cumulative from one step to the next. 
• Excellent response to starting/stopping/reversing. 
• Very reliable since there are no contact brushes in the motor. Therefore the life of the motor is simply dependant on the life of the bearing. 
• The motors response to digital input pulses provides open-loop control, making the motor simpler and less costly to control. 
• It is possible to achieve very low speed synchronous rotation with a load that is directly coupled to the shaft. 
• A wide range of rotational speeds can be realized as the speed is proportional to the frequency of the input pulses. 

Disadvantages:

• Resonances can occur if not properly controlled. 
• Not easy to operate at extremely high speeds.

Credit to : Prajapati Dipali, K., Raj Roshani, D., Patel Komal, C., & Hilali Marhaba, A. ( 2014). Automatic Gate Opening System For Vehicles With RFID or Password.