Q.What is the difference between [Hz] and [r/min], both of which are listed as units of rotation speed in the catalog?

r/min is the number of rotations per minute. This unit is commonly used to express motor rotation speed.
Hz expresses the number of pulses per second. This unit expresses the speed of the pulse signal sent from the controller to the control motor (driver). The pulse speed (Hz) is proportional to the rotation speed.
The conversion formula between [r/min] and [Hz] is as follows.

Rotation speed [r/min] = f × (θs/360) × 60

f

Pulse speed [Hz]

θs

Angle of movement per pulse of motor [°].