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                            <font size="4">AN907</font>
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                            Title:
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                            Stepping Motors Fundamentals
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                            Name:
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                            AN907
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                            Date:
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                            2/23/04
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                            Author:
                          </td>
                          <td class="NormalText" valign="top" align="left" colspan="2">
                            Reston Condit
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                            Description:
                          </td>
                          <td class="NormalText" valign="top" align="left" colspan="2">
                            <font style="TEXT-ALIGN: justify"><p>Stepping motors fill a unique niche in the motor control world. These motors 
  are commonly used in measurement and control applications. Sample applications<br>
  include ink jet printers, CNC machines and volumetric pumps. Several features 
  common to all stepper motors make them ideally suited for these types of applications. 
  These features are as follows:</p>
<ol>
  <li>Brushless &#8211; Stepper motors are brushless. The commutator and brushes 
    of conventional motors are some of the most failure-prone components, and 
    they create electrical arcs that are undesirable or dangerous in some environments.</li>
  <li>Load Independent &#8211; Stepper motors will turn at a set speed regardless 
    of load as long as the load does not exceed the torque rating for the motor.</li>
  <li>3. Open Loop Positioning &#8211; Stepper motors move in quantified increments 
    or steps. As long as the motor runs within its torque specification, the position 
    of the shaft is known at all times without the need for a feedback mechanism.</li>
  <li>4. Holding Torque &#8211; Stepper motors are able to hold the shaft stationary.</li>
  <li>5. Excellent response to start-up, stopping and reverse.</li>
</ol>
<p>The following sections discuss the most common types of stepper motors, what 
  circuitry is needed to drive these motors, and how to control stepping motors 
  with a microcontroller. </p></font>
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                            Keywords:
                          </td>
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                            AN907, Stepping Motors, Stepper Motors, Unipolar, Bipolar, Bifilar, Hybrid
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                            <b>Datasheets and Other Documentation</b>
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                            AN907
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