| Komocon has several types of AC motors as handling products. |
|
| The most common and simple industrial motor is the AC induction
motor. Our wide range of compact AC motor series seemed to be offering
many benefits to Factory Automation & Office automation. |
|
| Our AC motors are |
|
|
| Following is brief introduction on Advantages & Disadvantages
of AC motors just for your reference. This is just an information
and out line of general AC motors. |
|
| Advantages |
|
| |
| Disadvantages |
|
|
|
|
| Simple Design |
|
| The simple design of the AC motor -- simply a series of windings
in the exterior (stator) section with a simple rotating section
(rotor). The changing field caused by the 50 or 60 Hertz AC line
voltage causes the rotor to rotate around the axis of the motor. |
|
| The speed of the AC motor depends only on three variables: |
|
- The fixed number of winding sets (known as poles) built into
the motor, which determines the motor's basic speed.
- The frequency of the AC line voltage. Variable speed drives
change this frequency to change the speed of the motor.
- The amount of torque loading on the motor, which causes slip.
|
Low
Cost |
|
| Due to the simple design of the motor, AC motors are overwhelmingly
preferred for fixed speed and variable applications in industrial
applications and for commercial and domestic applications where
AC line power can be easily attached. Over 90% of all motors are
AC induction motors. They are found in air conditioners, washers,
dryers, industrial machinery, fans, blowers, vacuum cleaners, and
many, many other applications. |
|
| Reliable
Operation |
|
| The simple of the AC motor results in extremely
reliable, low maintenance operation. Unlike the DC Motor, there
are no brushes to replace. If run in the appropriate environment
for its enclosure the AC motor can expect to need new bearings after
several years of operation. If the application is well designed,
an AC motor may not need new bearings for more than a decade. |
|
| Easily
Found Replacements |
|
| The wide use of the AC motor has resulted in easily found replacements.
|
|
| Variety
of Mounting Styles |
|
| AC Motors are available in many different mounting styles such
as Foot mount, C-Face, Large Flange, Vertical, Specialty, etc for
convenience. |
|
| Many
Different Environmental Enclosures |
|
| Because of the wide range of environments in which people want
to use motors, the AC motor has been adapted by providing a wide
range of enclosures |
|
|
| Expensive
speed control |
|
| Speed control is expensive. The electronics required to handle
an AC inverter drive are considerably more expensive than those
required to handle a DC motor. However, if performance requirements
can be met -- meaning that the required speed range is over 1/3rd
of base speed -- AC inverters and AC motors are usually more cost-effective
than DC motors and DC drives for applications larger than about
10 horsepower, because of cost savings in the AC motor. |
|
| Inability
to operate at low speeds |
|
| Standard AC motors should not be operated at speeds less than
about 1/3rd of base speed. This is due to thermal considerations.
A DC motor should be considered for these applications. |
|
| Poor
positioning control |
|
| Positioning control is expensive and crude. Even a vector drive
is very crude when controlling a standard AC motor. Servo motors
are more appropriate for these applications. |
|
