Linear_Motors_and_Stepper_Motors

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					Title:
Linear Motors and Stepper Motors

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408

Summary:
A linear induction motor is made up of an inductor which is made of
individual cores with a concentrated polyphase. Linear motors can be
directly substituted for ball screw drives, hydraulic drives, pneumatic
drives, or cam drives.


Keywords:
linear motors rotary tables


Article Body:
A linear induction motor is made up of an inductor which is made of
individual cores with a concentrated polyphase. Linear motors can be
directly substituted for ball screw drives, hydraulic drives, pneumatic
drives, or cam drives.

A linear induction motor is basically what is referred to by experts as a
“rotating squirrel cage” induction motor. The difference is that the
motor is opened out flat. Instead of producing rotary torque from a
cylindrical machine it produces linear force from a flat machine. The
shape and the way it produces motion is changed, however it is still the
same as its cylindrical counterpart. There are no moving parts, however
and most experts don’t like that. It does have a silent operation and
reduced maintenance as well as a compact size, which appeals many
engineers. There is also a universal agreement that it has an ease of
control and installation. These are all important considerations when
thinking about what type of device you want to create. The linear
induction motor thrusts ratio varies depending mainly on the size and
rating. Speeds of the linear induction motor vary from zero to many
meters per second. Speed can be controlled. Stopping, starting and
reversing are all easy. Linear induction motors are improving constantly
and with improved control, lower life cycle cost, reduced maintenance and
higher performance they are becoming the choice of the experts. Linear
motors are simple to control and easy to use. They have a fast response
and high acceleration. Their speed is not dependant on contact friction
so it is easier to pick up speed quickly.

Stepper motors are a special kind of motor that moves in discrete steps.
When one set of windings is energized the motor moves a step in one
direction and when another set of windings is energized the motor moves a
step in the other direction. The advantage of stepper motors that the
position of the motor is "known". Zero position can be determined, if the
original position is known.

Stepping motors come in a wide range of angular resolution and the
coarsest motors typically turn 90 degrees per step. High resolution
permanent magnet motors are only able to handle about 1 8 degrees less
than that. With the right controller stepper motors can be run in half -
steps, which is amazing.

The main complaint about the stepper motor is that it usually draws more
power than a standard DC motor and maneuvering is also difficult.

				
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posted:12/26/2010
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Monika Kamal Monika Kamal Jesus http://ineed4u.blogspot.com/
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