Rotor control

A Hall Effect proximity switch is a non-contact electronic switch, which consist of a permanent magnet or ferromagnetic part as trigger intermediary and a Hall Effect sensor IC. The Hall sensor IC detects the change of the magnet field when the permanent magnet comes in the close proximity to it and generates an electric signal. This signal is amplified and rectified to control the output signal of the switch.




Compared with magneto-electric, optoelectronic and capacitive proximity switches, Hall proximity switches have the advantages of good output wave shape, high stability, low costs, unaffected by oil, dirt and vibration, and wide operating temperature etc. They are very suitable for integrating in PC systems and various kinds of industrial control equipments, and are optimal switches for position control, speed measurement, counting, direction detection and automatic protection etc.

  General Operation

The sensor consist of two hall-effect elements biased with a magnet to detect the change in magnetic field strength caused by the rotation of a ferrous target gear. When the target gear passes by sensor element A, the output switches from a logic 0 to a logic 1 at half the pitch (P/2) of the target gear. As the target gear continues, the output switches from a logic 1 to a logic 0 at the gear pitch (P).
  Sensor element B is placed at a distance of one fourth of the pitch of the target gear (P/4) from element A. The output of element B is shifted by one forth (P/4) from the output of element A. In electrical terms, this creates a phase shift of 90°. When the gear turns in the counterclockwise direction, output A leads output B. When the gear turns in the clockwise direction, output A lags output B.      

Using 12-core double shielded cable fron the control box towards the first junction box within the coax shed.

Sometimes a magnet drilling machine doesn't fit. In this situation I ahd to drill a hole close to as standoff and as you can see the performance is quick different ;o)


Using 2x inductive sensor DCKJ40-Q80KB-DPA with Switching distance of 40 mm.

  Actuator over travel

Acceleration time parameters always set the time to accelerate from 0 to the maximum output frequency. Deceleration time parameters always set the time to decelerate from maximum output frequency to 0. Using solid steel actuators to secure the overtravel time.
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