αSTEP/Stepper Motor: αSTEP

αSTEP is a stepper motor-based motor with a unique control that hybridizes the advantages of "open loop control" and "closed loop control." In normal operation, open loop control provides high responsiveness. During overload conditions, it continues operation by correcting the motor position with closed loop control.

Featuring Oriental Motor's Unique Closed Loop Control

A deviation counter calculates the deviation (time lag/advance) of the actual rotor's rotation position relative to the command position specified by the pulse signal.
The calculation result of the deviation counter is used to detect an "overload region" and operate the motor by switching between open mode and closed loop mode.

• Normally, the motor is operated in the open mode.
• Under an overload condition, the motor is operated in the closed loop mode.

In the closed loop mode, the excitation state of motor windings is controlled so that the maximum instantaneous torque is generated for the given rotation position of the rotor.
This control method eliminates unstable points (overload region) in the angle - torque characteristics.

AZ Series

Mechanical Multi-Rotation Absolute Encoder (ABZO sensor)

ABZO sensor mechanically detects the position and store it on the sensor side. By storing the position information on the sensor side, an absolute system is established in which position information can be retained even when the power supply is shut down. Also, it no longer requires a battery that was needed to back up position information, and therefore, the position information will not be lost even if the motor cable is disconnected.

AR Series

Built-In Rotor Position Detection Sensor

A built-in rotor position detection sensor is provided on the rear shaft side of the motor.