Stepper Motor RKII Series New Technology
Full-Time Microstep Driver With Full Digital Control (This control has been realized for 5-phase stepper motors for the first time)
Changing driver from the conventional total current detection PAM control to each phase current detection PWM control has changed the current in each phase into a sine wave. Current control is digitalized and calculated with high accuracy using the latest high-performance CPUs. As a result, microstep drive is possible throughout all speed ranges, significantly reducing vibration. In addition, by digitizing most of the analog circuit and incorporating it into the CPU, the number of components has been greatly reduced and the driver has been made smaller.
Conventional product (Total current detection PAM control)
1 current sensor detects the motor current for 5-phases. This method is combined with the PAM method to control the constant current so that the average current for the 5-phases is constant. The motor current has a trapezoidal wave shape.
RKII Series (Each phase current detection PWM control)
5 current sensors detect the motor current for 5-phases. This is a method of constant current control in combination with the PWM method. The motor current can be controlled in sine wave form.
Motor Current Waveform (Theoretical data)
Vibration is reduced when the motor current waveform changes from trapezoidal to sinusoidal.
High Efficiency Motors
By reviewing the materials, thickness, and fastening methods of the magnetic steel sheets of the stator and rotor, we have reduced the "iron loss" that is the main cause of loss when the motor rotates. Consequently, we have succeeded in significantly reducing "power consumption" and "heat generation."
