Control command unit

Control command unit
Both the servo motor and stepping motor are controlled by pulse train signals. In this case, a single pulse is the minimum unit of control.

The relationship of the rotation speed and rotation angle (position) with the pulse and motor are as follows:
  • The rotation angle (position) is proportional to the number of pulses.
  • The rotation speed is proportional to the pulse frequency (pps).
The quantity of movement per pulse of a machine depends on the design of the machine.

<With ball screw driving>
ねじリード = 10(mm)、エンコーダ1000(p/r)の場合

For lead of screw = 10 (mm), and a 1000 (p/r) encoder
Since lead of screw = 10 (mm), the carriage moves for 10 (mm) when the motor rotates 360°.
The motor needs 1000 pulses to rotate 360°, therefore the travel distance of one pulse is 10/1000 (mm) = 0.01 (mm).
Therefore, it takes 100 (1/0.01) pulses to move the carriage for a distance of 1mm.

In the same way, the machine speed by 1 pulse/second is as follows:
The travel distance for one pulse is 0.01 (mm), which means 1(pps) = 0.01 (mm/sec).
For example, to move at 10mm/sec, a speed of 10 / 0.01 = 1000 (pps) should be specified.

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