PKP Series 5-Phase Stepper Motors (DC Input)

PKP Series 5-Phase Hybrid Stepper Motors

PKP Series 5-Phase Stepper Motors (DC Input)

The high-torque PK/PKP series stepper motor offers balanced performance enhanced by high torque, low vibration and low noise.

  • 0.72° (500 pulse/rev) & 0.36° (1000 pulse/rev)
  • Wide Range of Gear Types for Inertia Matching & Higher Torque
  • New Pentagon Winding
  • Encoders - 500 or 1000 Lines of Resolution
  • Electromagnetic Brake Type
  • 5-Phase Stepper Drivers Available

Stepper Motor Lineup

Frame Size

Motor Types

Available Options

Current per Phase

Lead Wires

Max. Holding Torque

NEMA 8 hybrid stepper motors

0 .79 in. (20 mm)

Standard Type (0.72°)


0.35 A


3.2 oz-in

0.0231 N·m

Geared Type

56 ~ 85 oz-in

0.4 ~ 0.6 N·m

NEMA 11 hybrid stepper motors

1.10 in. (28 mm)

Standard Type (0.72°)


0.35 ~ 1.2 A


6.8 ~ 11 oz-in

0.048 ~ 0.072 N·m

High-Resolution (0.36°)

0.35 A

5.9 ~ 13 oz-in

0.042 ~ 0.09 N·m

Geared Type

0.35 or 0.75 A

28 ~ 336 oz-in

0.3 ~ 2.4 N·m

NEMA 17 hybrid stepper motors

1.65 in. (42 mm)

Standard Type (0.72°)

Electromagnetic Brake

0.75 ~ 1.8 A


34 ~ 59 oz-in

0.24 ~ 0.42 N·m

High-Resolution (0.36°)

Geared Type


0.75 A

48 ~ 704 oz-in

0.35 ~ 5 N·m

NEMA 23 / NEMA 24 hybrid stepper motors

2.36 in. (60 mm)

Standard Type (0.72°)

Electromagnetic Brake

1.4 ~ 2.4 A


59 ~ 230 oz-in

0.42 ~ 1.66 N·m

High-Resolution (0.36°)

Geared Type


1.4 A

11 ~ 1120 oz-in

1.25 ~ 8 N·m


High-Torque Type Stepper Motors (0.72°)

  • 0.79 in. (20 mm)
  • 1.10 in. (28 mm)
  • 1.65 in. (42 mm)
  • 2.36 in. (60 mm)

5-Phase Stepper Motors

High Accuracy

In general, stopping accuracy tends to be lower during microstep operation than full step operation and this effect is more noticeable in a 1.8° motor. In this situation, using a 0.72°/0.36° stepper motor along with a CVD 5-phase driver enables a higher positioning accuracy.

Stopping Accuracy:

  • 0.72° = ±0.05° (±3 arcmin)
  • 0.36° = ±0.034° (±2 arcmin)

Low Vibration and Low Noise

Because the basic step angle is small at 0.72° (0.36° for high-resolution type), the vibrations and noise are lower than the 2-phase stepper motor with a basic step angle of 1.8°. Also, vibrations and noise can be further reduced with the use of a 5-phase stepper motor and CVD 5-phase driver..

Utilizing Hybrid Stepper Motor Technology

A hybrid stepper motor is a combination of the variable reluctance and permanent magnet type motors. The rotor of a hybrid stepper motor is axially magnetized like a permanent magnet stepper motor, and the stator is electromagnetically energized like a variable reluctance stepper motor. Both the stator and rotor are multi-toothed.

A hybrid stepper motor has an axially magnetized rotor, meaning one end is magnetized as a north pole, and the other end a south pole. Toothed rotor cups are placed on each end of the magnet, and the cups are offset by half of a tooth pitch.

Hybrid Stepper Motor Rotor

High-Resolution Type Stepper Motors (0.36°)

  • 1.10 in. (28 mm)
  • 1.65 in. (42 mm)
  • 2.36 in. (60 mm)


High-Resolution 5-Phase Stepper Motors

The 0.36° high-torque type stepper motors provide 1000 steps per revolution by having 100 teeth on the rotor. This contributes to the highest resolution and lowest vibration.

5-Phase Stepper Motor Rotor

Lowest Vibration

The lowest vibration is achieved using the smallest basic step angle of 0.36°.

High Resolution - Low Vibration

Generates Higher Torque

The high-torque stepper motor generates approx. 1.2 to 1.5 times the torque achieved by the standard motor stepper motor.

5-Phase Stepper Motor Performance

Stop Position Accuracy of 2 Arc Minutes (No Load)

The 0.36° high-torque type stepper motor is designed with a stop position accuracy of 2 arc minutes (0.034°) [standard type: 3 arc minutes (0.05°)]. The reduced error helps improve the positioning accuracy.

5-phase stepper motor accuracy


Taper Hobbed Gear Stepper Motors (TH)

  • 1.10 in. (28 mm)
  • 1.65 in. (42 mm)
  • 2.36 in. (60 mm)

Taper Hobbed Gear Stepper Motors

High Speed, Low Backlash Gears

With the TH geared type, tapered gears are used for the spur gear's speed-reduction mechanism and the meshing gear. The tapered gear is produced through continuous profile shifting toward the shaft. The tapered gears are adjusted in the direction of the arrows, as shown in the figure, to reduce backlash.

Taper Hobbed Gear Structure

Planetary Gear Stepper Motors (PS)

  • 1.10 in. (28 mm)
  • 1.65 in. (42 mm)
  • 2.36 in. (60 mm)

Planetary Gear Stepper Motors

High Permissible Torque, Low Backlash Gears

In conventional spur-gear speed reduction mechanisms, gears mesh one to one, so the amount of torque is limited by the strength of each single gear. On the other hand, in the planetary gear speed reduction mechanism, a greater amount of torque can be transmitted, since torque is distributed through dispersion via several planetary gears.

Planetary Gear Structure

The Planetary Gear (PS) gear mechanism is comprised primarily of a sun gear, planetary gears and an internal tooth gear. The sun gear is installed on the central axis surrounded by planetary gears enclosed in an internal tooth gear centered on the central axis. The PS gear offers high permissible torque and low backlash [ 15 ~ 25 arc minute (0.25º~0.42º)]. Gear ratios of 5:1, 7.2:1, 10:1, 25:1, 36:1 and 50:1 are available.

Planetary Gear Structure


Harmonic Gear Stepper Motors (HG)

  • 0.79 in. (20 mm)
  • 1.18 in. (30 mm)
  • 1.65 in. (42 mm)
  • 2.36 in. (60 mm)

Harmonic Gear Stepper Motors

High Accuracy, Non-Backlash Performance Gears

The harmonic gear is a pre-assembled stepper motor and gear which offers unparalleled precision in positioning and features a simple structure. Unlike conventional spur gears, the harmonic gear is capable of averaging the effects of tooth pitch errors and accumulated pitch errors to the rotational accuracy, thus achieving highly accurate, non-backlash performance.

Harmonic Gear Structure

The harmonic gear utilizes the metal’s electrodynamics property. It is comprised of three basic components, a wave generator, flex spline and circular spline.

Stepper Motor Gear Structure

Harmonic Gear Rotation

Rotating the wave generator (input) clockwise while keeping the circular spline fixed in position will subject the flax spline to elastic deformation, causing a gradual shift in the point of engagement between the circular spline and flex spline.

Harmonic Gear Rotation

When the wave generator completes one revolution, the flex spline has rotated two fewer teeth than the circular spline has, resulting in the movement of the flex spline for the difference in the tooth count (two teeth) in the opposite direction of the wave generator's rotation (i.e. counterclockwise). This movement translates into output, thereby reducing the speed.

Surface Installation of Load

The harmonic geared type permits installation of load directly on the rotating surface integrated with the shaft. [Expect for geared stepper motors with a frame size of 3.54 in. (90 mm)].

Harmonic Gear Installation


Harmonic Gear Index Table



Encoder Options

  • 1.65 in. (42 mm)
  • 2.36 in. (60 mm)

Encoder Type Stepper Motors

encoder type stepper motor

A rotary encoder is an electro-mechanical device that converts the angular position of a shaft to an analog or digital code. There are two main types: absolute and incremental. Oriental Motor offers incremental types (TTL or Differential) as a standard product for our stepper motors. For an absolute encoder solution, use the AZ Series. For other standard product encoder offerings and motors that correct themselves, contact technical support  for assistance.

An incremental encoder provides the incremental change in position of the encoder to the counting electronics. Stepper motors with incremental encoders make it possible to monitor the present position and detect for errors. Position monitoring can be used to detect the position of the motor. For instance, to confirm normal operations, compare commanded position to the actual position.

2 or 3-Channel Encoders

Use the Index signal for the return-to-home operation. By using the Index signal, the return-to-home point will be detected with higher accuracy than single use of the return-to-home sensor. The index channel is an optional output channel which provides one pulse per revolution.

Line Driver Output Type

The Line Driver output offers excellent noise resistance because of the differential output and is capable of longer wiring distance compared to the voltage output.

Detecting for Errors

An incremental encoder works by providing an A and B pulse output. The counting is done through external electronics. Here, the encoder counter is compared to the commanded position counter (third party electronics). The point where the counting begins depends on the counter in the external electronics and not on the position of the encoder.

Stepper Motor Encoders

TTL or Differential Type

500 or 1000 p/rev
2 or 3-Channel
Compact & Space Saving

Electromagnetic Brake Option

  • 1.65 in. (42 mm)
  • 2.36 in. (60 mm)

Stepper Motor with Brake Option

These products have built-in power-off activated electromagnetic brakes. When power is accidentally cut off due to a blackout or other unexpected events, the electromagnetic brake holds the load in position to prevent it from dropping or moving. Also, when the motor is at standstill, it is held by the electromagnetic brake. It is possible to suppress the heat generated from the motor by turning off the motor current.

CVD 5-Phase Drivers

CVD 5-Phase Bipolar Drivers

The CVD 5-phase stepper motor driver offers superior performance and value and is ideal for OEM or single axis machines. The CVD stepper motor drivers offer:

  • Lowest Vibration and Noise with advanced Microstepping control
  • Significantly improves positional accuracy when microstepping
  • Small, thin microstepping drive with space saving FETs
  • Selectable step angle and microstepping filter control
  • Alarms
  • 24 VDC Input / 0.3 ~ 2.4 A


CRD 5-Phase Drivers

CRD 5-phase drivers

The CRD 5-phase drivers offer low vibration and compact size and are available with a Built-in Controller (Stored Data or Stored Program Type).

  • Microstepping Driver
  • Stored Data or Stored Program Type
  • 24 VDC / 0.35 ~ 1.4 A


Flexible Couplings

Flexible Couplings

This three-piece coupling adopts an aluminum alloy hub and a resin spider. The simple construction ensures that the high torque generated by a gear motor can be transmitted reliably. The proper elasticity of the spider suppresses motor vibration.


Mounting Brackets

Mounting brackets are convenient for installation and securing a stepper motor or geared stepper motor.

Clean Dampers

Mechanical dampers suppress stepper motor vibration and improve high-speed performance. An inertia body and silicon gel are hermetically sealed in a plastic case.

(For use with Double Shaft motors)

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. Accepts encoder inputs.

System Configuration

System Configuration

CAD / Manual Search

To locate product CAD and Operator Manuals please search using the product Item Number.

Technical Articles


Stepper Motor Application Example

5-Phase Stepper Motors

5-Phase Stepper Drivers


Linear Actuators
Rotary Actuators


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