19-06-2012, 02:20 PM
Stepper Motor
Stepper Motor .pptx (Size: 1.23 MB / Downloads: 98)
INTRODUCTION
Fundamentals of operation
How do stepper motors work?
Advantages and disadvantages
Characteristic of stepper motor
Stepping modes
Types of stepper motors
Slewing
STEPPER MOTOR
A stepper motor is brushless DC electric motor that can divide a full rotation into a large number of steps. The motor's position can be controlled well and accuracy without any feedback mechanism(extra source).
FUNDAMENTALS OF OPERATION
Frame 1: The top electromagnet (1) is turned on, attracting the nearest teeth of the gear-shaped iron rotor. With the teeth aligned to electromagnet 1, they will be slightly offset from electromagnet 2.
HOW DO STEPPERS WORK?
Steppers work in a very simple manner.
2 pole rotor with 3 poles
Switch A is closed, so this creates a north pole to attract the south pole of the rotor. There are 2 options, either de-energize the A switch and energize the B switch, or de-energize the A switch and energize the C switch.
HOW DO STEPPERS WORK?
This would cause the rotor to turn 60 degrees in either direction.
This is a simple example, to illustrate the operation of a stepper. Most stepper motors have many poles on the rotor, and can step from 90 degrees all the way down to a fraction of a degree per increment.