Linear Motor

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The Basic Types of Linear Stepper Motors

Linear stepper motors can be used as a compact linear actuator to achieve linear motion or linear reciprocating movement. To achieve linear motion, the main principle is to use screws and nuts meshing. This paper will introduce three main structures for linear stepper motors. NON-CAPTIVE LINEAR STEPPER MOTORS The rotor is equipped with the nuts for non-captive linear motors. The lead screw can be inserted into the motor, or it can be removed from the motor completely. The shaft has no stroke limits, but must be securely attached to an assembly that won't rotate. This will allow the lead screw's movement in and out the motor body to be free and without rotation. The motor body can be used as the drive or nut in some setups. Anti-rotation can be found at the attachments point. This is often a cut or machine thread at the end of the screw. The non-captive assembly may be the shortest overall. EXTERNAL LINEAR STEPPER MOTORS The motor rotor is made up of the lead screws for the external linear steppermotors. The external drive nut can be attached to a carriage. The nut moves in a linear fashion by moving back and forth on the lead screws as it turns. A bearing journal is the common end feature of the screw. External linear stepper motors look most like motorized rails, except that the nut can be replaced with a driven carriage assembly. CAPTIVE LINEAR STEPPER MOTORS A threaded drive shaft is used to attach a spline to a captive linear stepper motor. The spline shaft allows the motor to retract and extend as one unit without additional anti-rotation requirements. The captive actuator can be used for strokes up to three inches in length. Because it is self-contained, the basic design is less tolerant to system misalignment. The basic body of the captive is the longest.  
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