Hall-Effect Operation And Motor Phasing; Figure 2-13: Linear Motor Phasing - Aerotech BLM Series Hardware Manual

Hardware Manual BLM

2.8. Hall-Effect Operation and Motor Phasing

In linear servomotors, one popular method of commutation is with Hall-effect sensors. They sense
the presence of a magnetic field and provide an output as a function of the forcer position. Aerotech
linear motor Hall sensors provide a unique set of Hall-sensor outputs every 60 electrical degrees.
Therefore the forcer position can be resolved to any of six segments over 360 electrical degrees. The
Hall sensors used in the linear motors have an open collector output. Figure 2-13 shows the motor
BEMF versus Hall signal relationship for positive motion.
Figure 2-13: Linear Motor Phasing
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