State-of-the-Art
Stock & Custom Stepper Motor Control Manufacturer Offering Top Quality at
Wholesale Prices
Stepper Motor Control
Call TEMCo today for delivering
leading industry products that will supply your electrical needs and
help sustain your business functions, such as ordering a Stepper Motor
Control device for a new building or power expansion. Call us today at
510-490-2187.
Stepper Motor ControlThe Stepper Motor Compared
With Other Motors
Stepper Motor Control is based on a
specific type of motor known as the stepper motor, or step motor.
They are brushless and synchronous. They are brushless because
there is no wound armature to require energizing the armature.
They are synchronous because their rotor poles move at the same speed
to each other. An electromagnetic DC field excites the rotor.
The stepper motor may have a rotor of common metal and depends on
variable reluctance where minimum reluctance equals minimum gap.
A stepper may use a fixed magnet rotor where that alternative operates on the basis of
magnetic attraction and repulsion between the rotor and the
electromagnets. A third option is where a hybrid of both
approaches may be
used.
A stepper motor design is a reversal of the
common version of
the common DC
motor where there are fixed magnets positioned around an energized
armature. That type of motor requires brush contacts to carry
current to the armature. Stepper motor Control relies on
the design of the stepper motor. The rotor of that motor is
toothed and never energized. The electromagnets placed
around the rotor are energized and are also toothed. When any one of the electromagnets is energized
it causes the teeth to be magnetized on the electromagnetic side and
the teeth on both magnet and rotor will tend to line up. The
consecutive electromagnets (and their teeth's) relative
positions are deliberately off, so a magnet aligning one toothed
portion will automatically throw out the alignment of the next magnet
and its teeth.
The magnets are sequentially charged so as to move the rotor in
measured portions of a full circle. This way, the Stepper Motor
Control arrives at a precise motion without resorting to a
feedback mechanism of any kind.
Stepper Motor ControlThe Stepper Motor &
Efficiency
Stepper motor Controls are as precisely
accurate as the size and quantities of teeth on the rotor and the
electromagnets that determine the magnitude of movement. Number
of electromagnets is another factor. Accuracy will also depend on
the capabilities given the Stepper Motor Control mechanism.
These capabilities are reasonably able in surpassing those of the
mechanical aspects of the motors they control. There is little
possibility, therefore, that the motor control will inhibit motor
efficiency. The Stepper Motor Control can thereby be
as accurate as desired, and therefore, also very efficient in its
motions.
Stepper Motor ControlThe Stepper Motor
Liabilities
A Stepper Motor Control does have
drawbacks. The main one is that the rapid movement from
one magnet to another can bring about a roughness in motion that can be
radical at certain speeds. This is sometimes mitigated by quickly
accelerating through those ranges. Two other options are use of a
micro-stepping driver or by damping the system physically. (A
micro-stepping motor would break up the movement into many much smaller
increments. This would tend to reduce the tendency of jerky
motions resulting in "rough points" in rotation at certain speeds.) Torque loss,
another drawback, is experienced at increased speeds.
Balancing drive voltage against use of current limiting drivers can
improve torque.
Stepper Motor ControlThe Stepper Motor Wiring
Options
The usual stepper is open-loop; there is no
feedback indicating location or position of the rotor. The load or inertia may result in
carrying the rotor past or failing to arrive at an optimum point before energization. This creates the need to overbuild a stepper motor
so it will not lose steps. One option to this is using a servo
motor with a
servo
motor control. A closed loop system is now offered which
reports on the exact rotor position and allows increased efficiency in
applying energization. This prevents losses of steps through
variation in load or high load inertias.
The motors in a
two phase
stepper motor may also be either unipolar or bipolar. In a
unipolar motor there will be two windings in each phase. Each one
is dedicated to one magnetic field direction. The magnetic pole
can be reversed with no change in current direction. This
simplifies wiring and number of leads.
In the bipolar motor there is a single winding in
each phase. This requires the driving circuit to be more complex
so it can be reversed. Each phase requires two leads with none in
common.
An 8-lead stepper can additionally be used with
either unipolar, series or parallel windings, giving a variation in
choice of inductance, current levels, performance torque or speed.
The higher the number of phases (electromagnets),
the smoother the operation will generally be.
TEMCo's Philosophy
At TEMCo we place the customer first. We
firmly believe that there is an entire road a business's commitment to
its customers must
follow. It is marked by the six main critical steps inherent in
any business transaction. First we provide exemplary
customer service. Next the products are of high quality.
Then, speed of delivery is very important. After that is
great customer and product support such as is found at TEMCo.
Product support is then backed up by a best-in-industry warranty. Most great
businesses would stop there, but we go the last step and offer
the most competitive prices available.
Highest Quality Motor Controls
Call TEMCo with your specific
needs. TEMCos technical sales department has many years of
applications experience providing design and engineering assistance for
all types of Stepper Motor Control installations.
Call Our Stepper Motor Control Specialists
Today!
*Custom Stepper Motor
Control Voltage Combinations Available*
Contact our team at TEMCo
Transformer at
510-490-2187 to get your quote, place your order and arrange
for shipping.
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