Easy to use: 34%
Inexpensive: 17%
Simple operations:16%
No need for tuning: 12%
Other: 21%
*# of questionees: 258 (multiple answers allowed)/ researched by Oriental Motor
Inexpensive: 17%
Simple operations:16%
No need for tuning: 12%
Other: 21%
*# of questionees: 258 (multiple answers allowed)/ researched by Oriental Motor
Key Points: Ease-of-Use, Simple Operations and Low Cost
According to the survey of hybrids stepper motors users, many favor stepper motors for their "ease-of-use," "simple operations", and "low cost" derived from the structure and system configuration. It makes sense that many users find such positive aspects in stepper motors, thanks to the simple structure and system configuration.
Point 1
Fantastic Stopping Accuracy!
For example, when converting stopping accuracy ±0.05° of a stepper motor to the ball screw mechanism:
Operating Conditions:
• Motor: RK II Series
• Lead of ball screw: 10mm Stopping Accuracy: ±1.4μm
Generally, accuracy of a ground ball screw type is ±10μm. When using a rolled ball screw type, its accuracy declines to ±20μm, indicating that the stopping accuracy of a stepper motor is much higher than that of ball screw types.
Point 2
Excellent Mid/ Low-Speed Range!
Example: Torque of a motor frame size 85 mm is equivalent to a rated torque of a 400 W servo motor when 1000 r/min.
Torque in an even lower speed range can be up to 5 times higher. For a short- distance positioning, having high torque in the mid/low-speed range is essential.
Impressive "Stopping Accuracy," "Mid/Low-Speed Range" and "Responsiveness"
Stepper motors have remarkable stopping accuracy, and accurate control with open-loop is possible. For example, when using the RK II Series for positioning of a rotating table, its stopping accuracy is within ±0.05 degrees (with no load). Because stopping position errors do not accumulate between steps, high accuracy positioning is possible. The structure of the stepper motor, which requires no encoder, allows for the simple drive system and low cost.
High Responsiveness and Excellent Synchronization
The third remarkable feature of stepper motors is the responsiveness. The open-loop control, which sends one-way commands to the motor, has a very high follow-up mechanism toward commands.
Suitable Applications!
Other than an inching applications with frequent starting and stopping, stepper motors are suitable for positioning of image check processors that dislike vibrations, cam drives that would be difficult to adjust with servo motors, and low rigidity mechanisms such as a belt drive. Furthermore, cost is reduced significantly by replacing a ball screw drive to a belt drive.
Cost Reduction and the Advantage of Great Features
Besides cost reduction, stepper motors have many advantages in terms of performance. I hope this article provides an opportunity for those who have routinely selected servo motors to start considering stepper motors as their options. On the followong pages, detailed information of stepper motors, such as basic structure, system and example applications, is introduced for those who want to learn more about stepper motors.
Operation & Structure
A stepper motor rotates with a fixed step angle, just like the second hand of a clock. Highly accurate positioning can be performed with open-loop control thanks to the mechanical structure within the motor.
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