RAC-S

♦  Coupling divided into “Flexible type” and “Rigidity type”.

♦  To apply flexible couplings timing in case of power transmission, two shafts are not easy to set in alignment, or to simplify two shafts installation. It contains shock buffer to absorb parallelism, deflection, axial displacement, deviation improvement, and improvement of traditional transmission power, so few deviation would not cause any unusual situation on bearing. It is widely applied to current markets.

♦  Rigidity coupling is a unit causing non-eccentric, non-deflection, and make two connected shafts fixed in one unit. Users must do the best to have motor running and axis of load in alignment due to high requirement of concentricity, also means of axis has to be calibrated strictly; otherwise, the rotating shaft would be broken caused by mechanism fatigue, also the bearing would be thermal abrasion due to eccentric load, those were brought by continuous vibration of the axis during long term running of the motor. The advantage of rigidity couplings is to transmit transmission torque precisely.

Fixing Type

♦ Set screw fixing：
This fixing in low cost is the most traditional. Front of screw contacting with axis directly may cause damage or difficult disassembly.

♦ Clamping fixing：
Use sink screw securing to narrow the slit for clamping axis tightly.
Clamped fix and easy disassembly won’t cause damage of shaft.

♦ Separation fixing：
Use separated bushings to fix and disassemble without moving your equipment.

♦ Key way fixing：
This type is also traditional, like set screw fixing, suits for transmission in higher torque. Prevent from parallel movement, it’s usually used with set screw fixing and clamp fixing together.

♦ Zero Backlash type：
Zero backlash type coupling is designed to be equipped high precision clamping nut as one unit, performs high friction moment and reliable movement which is suitable for spindle transmission of the machine.

Motor Reference

♦ Stepping motor
(1) Without triple torque in case of running momently, but max. rated torque of motor occurs.
(2) Larger torque in low speed than servo motor in same level.
(3) Higher RPM, smaller torque in motor.
(4) Motor have temperature rise in case of running continuously.( to improve by using disk type coupling)
* Force output in stepping motor is smaller than servo motor.

♦ Servo motor
(1) More than triple torque occurs in case of running momently.
(2) Under rated RPM range, cause rated torque.
(3) Same torque produce in low speed and high speed
(4) Temperature rise is small in case of running continuously.

♦ Encoder
(1) Built-in in servo motor, has tiny driven torque.
(2) Or connected to stepping motor. (optional)