13-10-2012, 03:53 PM
Stepper Motor
Stepper Motor.ppt (Size: 928 KB / Downloads: 59)
Stepping motor / Step motor/ Brushless DC motor
It converts the electrical pulses into equal increments of angular displacement.
(OR)
It is an electromagnetic incremental actuator which converts digital pulse into analog output shaft motion.
Ideally suited for precise positioning and /or precise speed control in open loop.
Power output : 1 – 2500 watts
Advantages:
High rates of acceleration
Fast response
Quite robust and reliable due to the absence of rotor windings, commutator and brushes
Less maintenance
Disadvantage:
Absence of detent torque
Not easy to operate at extremely high speeds
Resonances can occur due to improper
Applications of Stepper Motor
Operation control:
Computer peripherals
Textile industry
IC fabrications
Robotics
Incremental motion:
Type writers
Line printers
Tape drives
Floppy disc drives
X-Y plotters
Numerically controlled machine tools
Process control systems
Classification of Stepper Motor
Depending upon type of rotor
Variable reluctance stepper motor
Permanent magnet stepper motor
Hybrid stepper motor
Depending of number of windings on stator
Two phase stepper motor
Three phase stepper motor
Four phase stepper motor
Also
Single stack and
Multistack stepper motors
Terminologies
Step: The angular rotation produced by the shaft each time the motor receives a step pulse.
Step angle: The angle through which the motor shaft rotates for each step input/command pulse.
= 360/(number of stator phases xnumber of rotor teeths)
Holding torque: The torque required to rotate the output shaft a full step with the motor energised.
Step response: Time taken by the motor to make one complete step.
Slew rate: The maximum step rate at which the motor will run under a rated load.
Ramping: A control method used to vary the step rate to a different rate whether it is accelerating or decelerating
Stepper Motor.ppt (Size: 928 KB / Downloads: 59)
Stepping motor / Step motor/ Brushless DC motor
It converts the electrical pulses into equal increments of angular displacement.
(OR)
It is an electromagnetic incremental actuator which converts digital pulse into analog output shaft motion.
Ideally suited for precise positioning and /or precise speed control in open loop.
Power output : 1 – 2500 watts
Advantages:
High rates of acceleration
Fast response
Quite robust and reliable due to the absence of rotor windings, commutator and brushes
Less maintenance
Disadvantage:
Absence of detent torque
Not easy to operate at extremely high speeds
Resonances can occur due to improper
Applications of Stepper Motor
Operation control:
Computer peripherals
Textile industry
IC fabrications
Robotics
Incremental motion:
Type writers
Line printers
Tape drives
Floppy disc drives
X-Y plotters
Numerically controlled machine tools
Process control systems
Classification of Stepper Motor
Depending upon type of rotor
Variable reluctance stepper motor
Permanent magnet stepper motor
Hybrid stepper motor
Depending of number of windings on stator
Two phase stepper motor
Three phase stepper motor
Four phase stepper motor
Also
Single stack and
Multistack stepper motors
Terminologies
Step: The angular rotation produced by the shaft each time the motor receives a step pulse.
Step angle: The angle through which the motor shaft rotates for each step input/command pulse.
= 360/(number of stator phases xnumber of rotor teeths)
Holding torque: The torque required to rotate the output shaft a full step with the motor energised.
Step response: Time taken by the motor to make one complete step.
Slew rate: The maximum step rate at which the motor will run under a rated load.
Ramping: A control method used to vary the step rate to a different rate whether it is accelerating or decelerating