Stepper motor

1. STEPPER MOTOR
Presented by
NAME : S.ARUNKUMAR
YEAR : IV YEAR
DEPARTMENT : MECHANICAL ENGINEERING
COLLEGE : SUDHARASAN ENGG COLLEGE

2. INTRODUCTION
• Introduction to Stepper Motors. This is Part 1 in a series of seminars
related to Stepper Motor Fundamentals. The following seminar will
focus on some of the stepper motors available for your applications.
So let’s begin.

3. WHAT IS A STEPPER MOTOR
• Motor that moves one step at a time
- A digital version of an electric motor
- Each step is defined by a Step Angle

4. NEED OF STEPPER MOTOR
Relatively inexpensive
Ideal for open loop positioning control
Can be implemented without feedback
Minimizes sensing devices
Just count the steps
Torque
Holds its position firmly when not turning
Eliminates mechanical brakes
Produces better torque than DC motors at lower speeds

5. COMPONENTS
• Consists of
 Stators
 Holds multiple windings/phases.

6. TYPE OF STEPPER MOTOR
• zPermanent Magnet
− Magnetic rotor
• Variable Reluctance
− Non-magnetic, geared rotor
• Hybrid
− Combines characteristics from PM and VR
− Magnetic, geared rotor

7. PERMANENENT MAGNET MOTOR
• Rotor rotates by energizing each winding ,
− Current flow generates magnetic polarity on each stator

8. ADVANTAGES
• The rotation of angle of motor is proportional t the input pulse.
• The motor has full torque at stand-still.
• It has excellent response to starting/stopping/reversing.
• No sensor is need for positioning and speed sensing.
• It readily interfaced wit a microprocessor.
• Speed does not depend on the torque applied on the axis.

9. Disadvantages
• Resonance can occur if not properly controlled.
• It is not easy to operate at extremely high speed.