18-05-2012, 12:07 PM
Stepper Motor System
[attachment=22331]
STEPPER MOTOR SYSTEMS OVERVIEW
Motion Control, in electronic terms, means to accurately control the movement of an object based on either speed,
distance, load, inertia or a combination of all these factors. There are numerous types of motion control systems,
including; Stepper Motor, Linear Step Motor, DC Brush, Brushless, Servo, Brushless Servo and more. This
document will concentrate on Step Motor technology.
In Theory, a Stepper motor is a marvel in simplicity. It has no brushes, or contacts. Basically it's a synchronous
motor with the magnetic field electronically switched to rotate the armature magnet around.
STEPPING MOTORS
TYPES OF STEPPER MOTORS
There are basically three types of stepping motors; variable reluctance, permanent magnet and hybrid. They differ in
terms of construction based on the use of permanent magnets and/or iron rotors with laminated steel stators.
VARIABLE RELUCTANCE
The variable reluctance motor does not use a permanent magnet. As a result, the motor rotor can move without
constraint or "detent" torque. This type of construction is good in non industrial applications that do not require a
high degree of motor torque, such as the positioning of a micro slide .
PERMANENT MAGNET
The permanent magnet motor, also referred to as a "canstack" motor, has, as the name implies, a permanent
magnet rotor. It is a relatively low speed, low torque device with large step angles of either 45 or 90 degrees. It's
simple construction and low cost make it an ideal choice for non industrial applications, such as a line printer print
wheel positioner.
HYBRID
Hybrid motors combine the best characteristics of the variable reluctance and permanent magnet motors. They are
constructed with multi-toothed stator poles and a permanent magnet rotor. Standard hybrid motors have 200 rotor
teeth and rotate at 1.80 step angles. Other hybrid motors are available in 0.9ºand 3.6º step angle configurations.
Because they exhibit high static and dynamic torque and run at very high step rates, hybrid motors are used in a
wide variety of industrial applications.
[attachment=22331]
STEPPER MOTOR SYSTEMS OVERVIEW
Motion Control, in electronic terms, means to accurately control the movement of an object based on either speed,
distance, load, inertia or a combination of all these factors. There are numerous types of motion control systems,
including; Stepper Motor, Linear Step Motor, DC Brush, Brushless, Servo, Brushless Servo and more. This
document will concentrate on Step Motor technology.
In Theory, a Stepper motor is a marvel in simplicity. It has no brushes, or contacts. Basically it's a synchronous
motor with the magnetic field electronically switched to rotate the armature magnet around.
STEPPING MOTORS
TYPES OF STEPPER MOTORS
There are basically three types of stepping motors; variable reluctance, permanent magnet and hybrid. They differ in
terms of construction based on the use of permanent magnets and/or iron rotors with laminated steel stators.
VARIABLE RELUCTANCE
The variable reluctance motor does not use a permanent magnet. As a result, the motor rotor can move without
constraint or "detent" torque. This type of construction is good in non industrial applications that do not require a
high degree of motor torque, such as the positioning of a micro slide .
PERMANENT MAGNET
The permanent magnet motor, also referred to as a "canstack" motor, has, as the name implies, a permanent
magnet rotor. It is a relatively low speed, low torque device with large step angles of either 45 or 90 degrees. It's
simple construction and low cost make it an ideal choice for non industrial applications, such as a line printer print
wheel positioner.
HYBRID
Hybrid motors combine the best characteristics of the variable reluctance and permanent magnet motors. They are
constructed with multi-toothed stator poles and a permanent magnet rotor. Standard hybrid motors have 200 rotor
teeth and rotate at 1.80 step angles. Other hybrid motors are available in 0.9ºand 3.6º step angle configurations.
Because they exhibit high static and dynamic torque and run at very high step rates, hybrid motors are used in a
wide variety of industrial applications.