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Hollow Rotary Actuators

DG Series

Hollow Rotary Actuators - DGII Series (Pulse Input Type)

The new DGII Series uses the highly efficient and energy saving AlphaStep AR Series as the motor of the hollow rotary actuator. High accuracy positioning can be performed while keeping the user-friendly features of a stepper motor intact.

Packages include 3 m (9.8 ft.) connection cables.

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High Positioning Accuracy

  • Non-Backlash
  • Repetitive Positioning Accuracy ±15 sec
  • Lost Motion 2 arc minutes

Note: The repetitive positioning accuracy is measured at a constant temperature (normal temperature) under a constant load.

Large-Diameter, Hollow Output Table Makes Simple Wiring and Piping Possible

The large diameter hollow hole (through-hole) helps reduce the complexity of wiring and piping, thus simplifying your equipment design.

Hollow Output Table

Product Application Demos

Product Demo

Click to view Demo #1

Product Demo

Click to view Demo #2


Contributes to Easier Equipment Design

The gear-reduction mechanism employs precision gears along with a proprietary adjustment mechanism that eliminates backlash. The repetitive positioning accuracy from a single direction is ±15 sec., while lost monition in a positioning operation from two directions is 2 arc minutes. These characteristics make the DGII series the ideal choice for applications in which accurate positioning is a must.

Accurate Positioning
Actuator with High Strength, Accuracy and Reliability
Moment Load

High Power and Rigidity

The hollow output table is integrated with a high rigidity crossroller bearing*. The structure improves permissible thrust load and moment load while maintaining high torque.
*Excludes the DG60

The output table uses deep-groove ball bearings (two pieces) for the 2.36 in. (60 mm) frame size type, and a cross-roller bearing for the 3.35 in. (85 mm), 5.12 in. (130 mm) and 7.87 in. (200 mm) frame size types. As the frame size increases, the permissible moment load also increases but the displacement caused by the moment load decreases.

"Home Sensor Set" is Available as an Accessory

Since the sensor set comes with all the parts required for the return-to-home operation, less time is spent designing, fabricating and procuring parts related to sensor installation.

DG130 Sensor Installation Example

Home Sensor Set is Available as an Accessory

Direct Coupling for Higher Reliability

Equipment tables and arms can be installed directly on the output table. This saves you the hassle and cost of designing an installation mechanism, arranging necessary parts, adjusting the belt tension, etc. when mechanical parts such as belt and pulley are used for installation.

Direct Coupling

Built-in Controller Package (Stored Data) Also Available


The DGII Series with Built-in Controller (Store Data) Type is a hollow rotary actuator and driver package with a stored data controller built-in. The burden on the programmable PLC is reduced because the information necessary for motor operations is built into the driver.

The DGII Series with Pulse Input Type is offered for PLC (Master Controller) motion profile control. Both type increases system configuration flexibility.

Motor Features: High Reliability Plus High Efficiency. AlphaStep AR Series Now Used.

Adoption of a Rotor Position Detection Sensor (Resolver)

Rotor Detection Sensor

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

Performance such as heat resistance and vibration resistance is improved over regular optical encoders.

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

High Efficiency and Energy Saving

A closed loop AlphaStep AR Series stepper motor and driver package has been adopted as the motor. This creates a more efficient and energy saving product compared with conventional models.

The AR Series uses Oriental Motor's closed loop control to maintain positioning operation even during abrupt load fluctuations and accelerations. The rotor position detection sensor monitors the rotation. When an overload condition is detected, the AR Series will instantaneously regain control using the closed loop mode. When an overload condition continues, the AR Series will output an alarm signal, thereby providing reliability equal to that of a servo motor. Learn more about the AlphaStep technology.

Lower Heat Generation

Heat generation by the motor has been significantly reduced through higher efficiency.

Speed Torque

Motor Surface Temperature during Same Operation Conditions

Continues Operation Even with Sudden Load Fluctuation and Sudden Acceleration

Operates synchronously with commands using open loop control during normal conditions. In an overload condition, changes immediately to closed loop control to correct the position.

Speed Torque


Alarm Signal Output in Case of Abnormality

If an overload is applied continuously, an alarm signal is output. When the positioning is complete, an END signal is output. This ensures the same level of reliability achieved by an advanced closed loop system or a servo motor.

Closed Loop Diagram

Power Consumption: 66% Less* Than Conventional Model

Speed Torque



Extended FunctionsExtended Functions

You can combine a control module (OPX-2A) (sold separately) or data setting software* (MEXE02) both to change parameters, add functions and perform various monitoring operations according to the needs of your system.

*Cable for connection to PC required for MEXE02 data setting software (sold separately**- see Accessories).

**One FREE CC05IF-USB communications cable is available per customer, contact Technical Support for more information.

Item Overview Basic

Selection of Pulse Input Mode

Select the 1-pulse input or 2-pulse input (negative logic) mode.

Yes Yes

In addition to the normal settings, phase difference input can be set.
- 1-pulse input mode (positive logic/negative logic)
- 2-pulse input mode (positive logic/negative logic)
- Phase difference input (1-multiplication/2-multiplication/4-multiplication)

- Yes

Resolution Setting

Select the resolution with the function switches (D0, D1, CS0, CS1).

Yes Yes

Changes the value of the electronic gear corresponding to each function switch (D0, D1, CS0,CS1).

- Yes

Running Current Setting

Changes the running current setting with the current setting switch (CURRENT)

Yes Yes

Changes the value corresponding to each of 0~F (16 levels) for the current setting switch (CURRENT)

- Yes

Standstill Current Setting

Sets the ratio of the standstill current relative to the running current.

- Yes

Motor Rotational Coordinates Setting

Sets the rotational coordinates of the motor.

- Yes

All Windings On Signal (C-ON input)

The input signal for the excitation of the motor.

Yes Yes

Sets the C-ON input logic for when the power supply is input.

- Yes

Return to Excitation Position Operation during All Windings On Enable/Disable

Sets whether or not to return to the excitation position (deviation 0 position) during all windings on.

- Yes

Alarm Code Signal Enable/Disable

Set to output the code when an alarm occurs.

- Yes

END Output Signal Range Setting

Changes the END output signal range.

- Yes

END Output Signal Offset

Offsets the END output signal value.

- Yes

A-/B- Phase Output

Use for motor position verification

Yes Yes

Timing Output Signal

This is output each time the motor rotates 7.2° (0.4° for output table)

Yes Yes

Velocity Filter Setting

Applies a filter to the operation command to control the motor action.

Yes Yes

Change the value corresponding to each of 0~F (16 levels) for the setting switch.

- Yes

Vibration Suppression Function for Normal Mode

Set to suppress resonant vibration during rotation.

- Yes

Set to suppress vibration during acceleration, deceleration and stopping.

- Yes

Gain Adjustment for Current Control Mode*

Adjusts the position and speed loop gain.

- Yes

Adjusts the speed integration time constant.

- Yes

Sets the damping control vibration frequency.

- Yes

Sets whether to enable or disable damping control.

- Yes

Selection of Motor Excitation Position at Power On

Selects the motor excitation position for when the power is turned on.

- Yes

Control Module Setting

Select whether to use symbols or an absolute value display for the speed display of the control module.

- Yes

Sets the geared motor gear ratio for the speed monitor (The gear ratio for the DGII Series is 1:18)

- Yes

*Except when to further reduce heat generation or noise, using normal mode is recommended.

Product Lineup


Frame Size

Power Supply

Permissible Torque

Permissible Speed

Permissible Moment Load


Permissible Thrust Load

N (lb.)

Standard Type Electromagnetic Brake Type


2.36 in.

24 VDC




2 (17.7) 100 (22)


3.35 in.

Single-Phase 100-115 VAC



200 10 (88) 500 (112)

Single-Phase 200-230 VAC

Three-Phase 200-230 VAC


5.12 in.

Single-Phase 100-115 VAC

Single-Phase 100-115 VAC


200 50 (440) 2000 (450)

Single-Phase 200-230 VAC

Single-Phase 200-230 VAC

Three-Phase 200-230 VAC

Three-Phase 200-230 VAC


7.87 in.

Single-Phase 100-115 VAC

Single-Phase 100-115 VAC



100 (880) 4000 (900)

Single-Phase 200-230 VAC

Single-Phase 200-230 VAC

Three-Phase 200-230 VAC

Three-Phase 200-230 VAC

View Products = View all DGII Series products.

System Configuration

Control Options

Using either the optional control module or data setting software you can change parameters, add functions and perform various monitoring operations according to the needs of your system. (See Extended Functions)

Control Module (OPX-2A)


Cable for Data Setting Software

Cable for Data Setting Software

This communication cable is required for connecting to the
computer on which the data setting software is installed.

*One FREE CC05IF-USB communications cable is available per customer, contact Technical Support for more information.

Home Sensor Set

Home Sensor Set
A home-sensor set, which consists of a photomicro sensor, connector with cable, sensor mounting bracket, shielding plate and mounting screws, is provided to facilitate easy return to home operation.

Available in NPN or PNP sensor output.
Model Sensor

Installation Pedestal

Installation Pedestal

This is a useful installation pedestal that enables the DGII Series to be used as a direct drive motor. Applications that require height and installation from the side can also be performed, expanding the range of available operations.

Model Type Applicable Products
 MDG60A Single Shaft DG60-ARA
 MDG60B Single/Double Shaft DG60-ARA
 MDG85A Single Shaft DG85R-ARA
 MDG85B Single/Double Shaft DG85R-ARA
 MDG130A Single Shaft DG130R-ARA
 MDG130B Single/Double Shaft, Electromagnetic Brake DG130R-ARA

Connection / Extension Cables*

Motor Cables

Cables for connecting the motor and driver. Flexible and extension cables are also available.

*Packages include 3 m (9.8 ft.) connection cable set.

General Purpose Cable

Driver CableThis shielded cable has a half pitch connector at one end of the cable for easy connection to the driver.

Model Type Applicable Connector Length
CC36D1E Straight CN5 (36 pins) 3.3 ft. (1 m)
CC36D2E 6.6 ft. (2 m)
CC36D1AE Right-Angle 3.3 ft. (1 m)
CC36D2AE 6.6 ft. (2 m)

Connector - Terminal Block Conversion Unit

terminal blockA terminal block conversion unit connects a driver to a host controller.

  • With a signal name plate for easy, one-glance identification of driver signal names
  • DIN-rail mountable
Model Applicable Connector Length
CC36T10E CN5 (36 pins) 3.3 ft. (1 m)

Enclosure Fans Available for Control Box Cooling

Enclosure Fans for Control Box Cooling




Controllers are devices that output pulse signals needed to operate a linear actuator. Controllers let you make various settings to control your motor and also permit connection with a host programmable controller and sensors or PC. Select a controller that best suits your system.


Technology Training Videos

ORIENTAL MOTOR offers monthly Live Seminars as well as On Demand Training Videos.


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