HOME Advanced Micro Systems motion control drivers and indexers.: "A Stepping Motor System consists of three basic elements, often combined with some type of user interface (Host Computer, PLC or Dumb Terminal):
The Step motor Indexer (or motion controller) is a microprocessor capable of generating step pulses and direction signals for the driver. In addition, the indexer is typically required to perform many other sophisticated command functions."
STEP MODES
Stepper motor "step modes" include Full, Half and Microstep. The type of step mode output of any motor is dependent on the design of the driver.
FULL STEP
Standard stepping motors have 50 rotor teeth producing 200 full steps per revolution of the motor shaft.
HALF STEP
Half step simply means that the motor is rotating at 400 steps per revolution. In this mode, one winding is energized and then two windings are energized alternately, causing the rotor to rotate at half the distance, or 0.9ยบ's. (The same effect can be achieved by operating in full step mode with a 400 step per revolution motor). Half stepping is a more practical solution however, in industrial applications. Although it provides slightly less torque, half step mode reduces the amount "jumpiness" inherent in running in a full step mode.
MICROSTEP
Microstep is a relatively new stepper motor technology that controls the current in the motor winding to a degree that further subdivides the number of positions between poles. AMS microstep drives are capable of rotating at 1/256 of a step (per step), or over 50,000 steps per revolution.
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Tuesday, July 15, 2003
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