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AlphaStep Closed Loop Stepper Motor Systems

Closed Loop Stepper Motors

 

AlphaStep Closed Loop Stepper Motors

AlphaStep Closed Loop Stepper Motor Systems

Oriental Motor's AlphaStep closed loop control systems perform accurate positioning operations with ease. The AlphaStep features a unique control system combining the benefits of "open loop control" and "closed loop control".

With the AlphaStep control system, the position of the motor is always monitored and then the driver automatically switches between the two types of control depending on the situation. Under normal circumstances the operation of the motor is monitored and control is applied using open loop like a standard stepper motor. If an error occurs between the command and motor position due to a load or the like, the system immediately switches to closed loop control like a servo motor. This corrects the position and speed maintaining the desired operation. The combination of these two control methods ensures high reliability and performance.

To expand applications of stepper motors, Oriental Motor offers many different product series designed with different power specifications and various functions. A wide spectrum of variation are available within each series, as products come in many frame sizes and pre-assembled options, such as electromagnetic brake types, geared types or linear and rotary actuator products.


αSTEP Hybrid Control Systems

AlphaStep products are stepper motor based hybrid motors with a unique hybrid control system combining the benefits of "open loop control" and "closed loop control".

The position of the motor is always monitored, and then the driver automatically switches between 2 types of control depending on the situation.

Normally Operates in Open Loop Control for the Same Ease of Use as a Stepper Motor

Open Loop Control

High Response

By utilizing the high responsiveness of the stepper motor, moving a short distance for a short time is possible. The motors can execute commands without lag.

High Response

Holding the Stop Position without Hunting

During positioning, the motor stops with its own holding force without hunting. Because of this, it is ideal for applications where the low rigidity of the mechanism requires absence of vibration upon stopping.

Tuning-Free

Because it is normally operated with open loop control, positioning is still possible without gain adjustment even when the load fluctuates due to the use of a belt mechanism, cam or chain drive, etc.

Switches to Closed Loop Control during Overload for More Reliable Operation like a Servo Motor

Closed Loop Control

Continues Operation Even with Sudden Load Fluctuation and Sudden Acceleration

It operates synchronously with commands using open loop control during normal conditions. In an overload condition, it switches immediately to closed loop control to correct the position.

Closed Loop Control

Alarm Signal Output in Case of Abnormality

If an overload is applied continuously, an alarm signal is output. When the positioning is complete, and END signal is output. This ensures the same level of reliability as a servo motor.

 


 

AlphaStep Performance

What is the Output of αSTEP?

"Rated Output" is not listed because AlphaStep has no "rated speed". Refer to the graph below to compare rate torque of the AlphaStep to Watts of of servo motor's rated output torque.

AlphaStep Rated Output

What is the Stopping Accuracy of αSTEP?

The stopping accuracy of a typical AlphaStep is ±0.05° (under no load), which is equivalent to that of servo motors. The graphs below show the actual measured stopping accuracies when an AlphaStep and an AC servo motor were rotated once.

AlphaStep Stopping Accuracy

Hybrid Control System

The hybrid control system constantly monitors the motors position allowing for the benefits of performance from "open loop" control while providing the assurance of "closed loop " performance.

Normal Conditions
Overload Condition


 

AlphaStep Sensor Types

AZ Series with Absolute (ABZO) Sensor - αSTEP

Absolute Mechanical Sensor

The AlphaStep AZ Series stepper motors offer high efficiency, low vibration and incorporates our newly developed Mechanical Absolute Encoder for absolute-type positioning without battery back-up or external sensors to buy.

Mechanical Multi-turn Absolute Sensor

Absolute position detection is possible within ±900 rotations (1800 rotations) of the motor shaft from the home reference.

No Battery Required

Because positioning information is managed mechanically by the absolute sensor, the positioning information can be preserved, even if the power turns off or if the cable between the motor and driver is disconnected.

 


AR Series with Rotor Position Detection Sensor - αSTEP

AR Series Rotor Position Detector

The AlphaStep AR Series stepper motors offer high efficiency, low vibration, continuous operation with the security of closed loop performance without hunting or gain tuning.

Slim Motor Sensor

Because the sensor is compact and slim, the overall length of the motor has been reduced.

High Performance Resolver

Performance such as heat resistance and vibration resistance is better than with regular optical encoders.

Reduced Wiring

Because an encoder cable is not necessary, the motor and driver can be connected with just 1 cable.

 

 

AlphaStep Motor Types

The AlphaStep stepper motors are used in multiple product types to meet your specific application needs; stepper motors available with a wide range of gearing options and brake types, as well as a full line linear actuators and rotary actuators.




 

αSTEP Stepper Motor Driver Types

A wide range of stepper motor drivers are available for use with the AlphaStep series products:

AZ Series AC Input Drivers

AlphaStep AC Input Drivers

The AlphaStep AZD (AC Input) Drivers offers superior high speed performance, high functionality and closed loop control. There are no external sensors to buy as the motor and driver complete the system. Available in 5 types; EtherNet/IP™, EtherCAT compatible, a stored data (network) driver, pulse input driver or pulse input with RS-485 communications for monitoring. Advanced operation and function control is included through our MEXE02 software (free download). The AlphaStep AZD (AC Input) Drivers can perform quick positioning operations over a short distance without the need for tuning, while providing smooth performance.

  • Built-in Protective Functions
  • Emergency Torque Off Function
  • Pulse Input, Pulse Input with RS-485 Communications, Built-in Controller (Network), EtherCAT or EtherNet/IP™ Types
  • Single-Phase 100-120 VAC or Single-Phase/Three-Phase 200-240 VAC
  • For use with AlphaStep AZ Series Motors (AC Input)

EtherCAT

 

AZ Series DC Input Drivers

AlphaStep DC Input Drivers

The AlphaStep AZD-K Drivers offer 24/48 VDC input voltage, high functionality and closed loop control. There are no external sensors to buy as the motor and driver complete the system. Available in 5 types; EtherNet/IP™, EtherCAT compatible, a stored data (network) driver, pulse input driver or pulse input with RS-485 communications for monitoring. Advanced operation and function control is included through our MEXE02 software (free download). The AlphaStep AZD-K (DC Input) can perform quick positioning operations over a short distance without the need for tuning, while providing smooth performance.

  • Built-in Protective Functions
  • Pulse Input, Pulse Input with RS-485 Communications, Built-in Controller (Network), EtherCAT or EtherNet/IP™ Types
  • 24/48 VDC
  • For use with AlphaStep AZ Series Motors (DC Input)

EtherCAT

 

Multi-Axis Controller / Driver (EtherCAT)

Multi-Axis Controller / Driver

A multi-axis controller that supports EtherCAT communication.Compatible with the CiA402 drive profile. It can be connected to the AZ Series DC input motors and electric actuators.

2-axis, 3-axis and 4-axis driver connections are available.

  • 24/48VDC
  • Multi-Axis Motor Connection Cables required*

EtherCat

AR Series AC Input Drivers

AC Input Drivers

The AlphaStep ARD (AC Input) Drivers offers superior high speed performance, low vibration and closed loop control. Available in a stored data (network) driver or pulse input driver. Advanced operation and function control is included through our MEXE02 software (free download). The ARD (AC Input) Drivers can perform quick positioning operations over a short distance without the need for tuning, while providing smooth performance.

  • Built-in Protective Functions
  • Pulse Input or Built-in Controller (Network) Types
  • Single-Phase 100-115, 200-240 VAC or Three-Phase 200-230 VAC
  • For use with AlphaStep AR Series Motors (AC Input)

 

AR Series DC Input Drivers

AC Input Drivers

The AlphaStep ARD-K (DC Input) Drivers offer 24/48 VDC input voltage, low vibration and closed loop control. Available in a stored data (network) driver or pulse input driver. Advanced operation and function control is included through our MEXE02 software (free download). The ARD-K (DC Input) Driver can perform quick positioning operations over a short distance without the need for tuning, while providing smooth performance.

  • Built-in Protective Functions
  • Pulse Input or Built-in Controller (Network) Types
  • 24/48 VDC
  • For use with AlphaStep AR Series Motors (DC Input)

 

SCX11 Universal Controller

universal controller

The SCX11 is a highly-functional and sophisticated controller equipped with program editing and execution functions. Use the SCX11 as a stored program controller to connect to any of Oriental Motor's standard pulse input drivers. The SCX11 is also able to control the motor via serial communications such as USB, RS-232C and CANopen.

 

Network Gateways

Network Gateways

The communication protocol of the master controller, Factory Automation (FA) network, is converted to Oriental Motor's own RS-485 communication protocol. Connection to Oriental Motor's network compatible products is completed with one RS-485 communication cable.

  • Compatible Networks:
    CC-Link, MECHATROLINK-II, MECHATROLINK-III, EtherCat

EtherCat CC-Link MECHATROLINK


 


EtherNet/IP™ Compatible Driver

With the EtherNet/IP driver, the operating data can sent from the host system or can be set in the driver and selected and executed from a host system. Host system connection and control are performed with I/O Stored Data or EtherNet/IP communications.

EtherNet/IP Drivers

AZ Series EtherNet/IP™ Drivers

Easily control the AZ Series by directly connecting to the EtherNet/IP master device using a single EtherNet/IP communications cable. This allows for quick and simple wiring.

EtherNet/IP Network


EtherNet/IP™ Support Software and EDS File

An EDS file has been prepared to allow EtherNet/IP compatible products to be used more easily.

Built-in Controller Type (Network Compatible)
Built-in Controller Type

With this type of driver, the operating data is set in the driver and is then selected and executed from the host system. Host system connection and control are performed with any of the following: I/O, Modbus (RTU), RS-485 communication or FA network.

By using a network converter (sold separately), CC-link, MECHATROLINK or EtherCAT communication is possible.

FLEX is the collective name for products that support I/O control, Modbus (RTU) control and FA network control via network converters.

Built-in Controller

Built-in Controller Control Methods

 

Pulse Input Type with RS-485 Communication (AZ Series Only)
Pulse Input Type with RS-485 Communication

This type executes operations by inputting pulses into the driver. Control the motor using a positioning module (pulse generator) that you have obtained yourself. Rs-485 Communication can be used to monitor status information for the motor (position, speed, torque, alarms, temperature and more).

RS-485 Driver

RS-485 Driver Control Methods

 

Pulse Input Type
Pulse Input Driver

This type executes operations by inputting pulses into the driver. Control the motor using a positioning module (pulse generator) that you have obtained yourself. The support software (MEXE02) can be used to check alarm history and monitor status information.


 

Network Compatible Multi-Axis Driver (AZ Series DC Input Only)
Multi-Axis Driver

This multi-axis driver is compatible with EtherCAT drive profiles.

AZ Series DC input motors (and linear and rotary actuators that contain them) can be connected.

Drivers that can connect 2, 3 or 4 axes are available.


AlphaStep Multi-Axis Controller Control Methods

 



 

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