Hybrid stepper motor
Oriental Motor PKP Series 2-phase stepper motors
High-torque 2-phase hybrid stepper motors in frames from 13 mm (NEMA 5) to 85 mm (NEMA 34), 1.8 deg or 0.9 deg step, holding torques up to 9.5 N·m for standard types and up to 120 N·m geared.
Key specifications
| Frame sizes | 13, 20, 28, 35, 42, 56.4, 60, 85 |
|---|---|
| Current (max) | 6.3 A |
| Holding torque | 0.02–9.5 Nm |
| NEMA sizes | 5, 8, 11, 14, 17, 23, 24, 34 |
| Step angle | 1.8 (standard), 0.9 (high-resolution) |
| Geared holding torque max | 120 |
| Options | spur, planetary and harmonic gearheads; encoder 200/400/1000 lines; power-off brake (28 mm and larger); flat types |
Summarised in our own words from ORIENTAL MOTOR CO., LTD.'s published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1
Notes on this data
IP rating not stated on the series page.
Specify Motion is not affiliated with ORIENTAL MOTOR CO., LTD.. Oriental Motor and PKP Series 2-phase stepper motors are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
Alternatives that meet or exceed these figures
Engineers often come to us with an Oriental Motor part number and leave with an alternative that is easier to source, quicker to deliver or a better fit for the machine. These 3 series from our supply network are the closest match on published figures.
110 mm 2-phase hybrid stepper, 11-33 Nm, for high-torque industrial and CNC axes; pairs with high-voltage AC stepper drives.
| Published maximum | PKP Series 2-phase stepper motors | NEMA 42 High Torque (M110STH) |
|---|---|---|
| Holding torque | 9.5 Nm | 33 Nm meets or exceeds |
| Current | 6.3 A | 8 A meets or exceeds |
Leadshine's current 2-phase open-loop hybrid stepper range from 20 mm to 130 mm frames, with encoder, brake, IP65 and gearbox variants.
| Published maximum | PKP Series 2-phase stepper motors | Leadshine CM Series (2-phase) |
|---|---|---|
| Holding torque | 9.5 Nm | 45 Nm meets or exceeds |
| Current | 6.3 A | 7 A meets or exceeds |
86 mm 2-phase hybrid stepper with 22 windings from 2.2 to ~12 Nm, for CNC and heavier industrial axes.
| Published maximum | PKP Series 2-phase stepper motors | NEMA 34 High Torque (M86STH) |
|---|---|---|
| Holding torque | 9.5 Nm | 11.96 Nm meets or exceeds |
| Current | 6.3 A | 6.2 A |
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
What a hybrid stepper motor is
A hybrid stepper motor moves in fixed angular steps, typically 1.8° or 200 full steps per revolution, as a drive switches current through its windings in sequence. It combines a permanent-magnet rotor with toothed iron stator and rotor sections, giving high holding torque and fine resolution. With a microstepping drive, each full step is split into smaller steps for smoother motion. Steppers usually run open loop, so position is known by counting steps rather than measured.
When engineers choose a hybrid stepper motor
Choose a hybrid stepper for low-cost, simple positioning at low to moderate speed, such as indexing, dosing, small axes and instruments. It holds position strongly at standstill and needs no tuning. The trade-offs are falling torque at speed, resonance and possible lost steps if overloaded. Where speed is high, loads vary or a missed position would cause a fault, a closed-loop stepper or servo is safer.
How to specify the Oriental Motor PKP Series 2-phase stepper motors
Send these with your enquiry and an engineer can confirm the right PKP Series 2-phase stepper motors variant or an equivalent:
- Holding torque (Nm)
- Torque needed at operating speed (Nm at rpm)
- Frame size (NEMA or mm)
- Step angle (°)
- Phase current and inductance (A, mH)
- Drive voltage (V)
- Shaft, encoder and IP options
Common mistakes to avoid
- Sizing on holding torque instead of the pull-out curve
- Driving with too low a supply voltage, losing high-speed torque
- Leaving out torque margin, typically 30% to 50%
- Ignoring resonance in the mid-speed range
Oriental Motor PKP Series 2-phase stepper motors: frequently asked questions
What is the Oriental Motor PKP Series 2-phase stepper motors?
High-torque 2-phase hybrid stepper motors in frames from 13 mm (NEMA 5) to 85 mm (NEMA 34), 1.8 deg or 0.9 deg step, holding torques up to 9.5 N·m for standard types and up to 120 N·m geared. Published series figures include current 6.3 A, holding torque 0.02 Nm, holding torque 9.5 Nm. It is made by ORIENTAL MOTOR CO., LTD.; Specify Motion can help source it or propose an equivalent.
Who makes the Oriental Motor PKP Series 2-phase stepper motors?
The Oriental Motor PKP Series 2-phase stepper motors is made by Oriental Motor (ORIENTAL MOTOR CO., LTD.) and is listed here for engineers comparing options. Specify Motion is not affiliated with ORIENTAL MOTOR CO., LTD.; brand names are used only to identify the product.
What is the current of the Oriental Motor PKP Series 2-phase stepper motors?
The published series maximum current is 6.3 A. Individual models and sizes in the PKP Series 2-phase stepper motors range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the Oriental Motor PKP Series 2-phase stepper motors?
Yes. On published figures, NEMA 42 High Torque (M110STH) and Leadshine CM Series (2-phase) are the closest match from our supply network. An engineer confirms the fit against your application before recommending anything.
Why do stepper motors lose torque at high speed?
Winding inductance limits how fast current can rise each step. As speed increases there is less time per step, so current and torque fall. A higher drive voltage raises current faster and extends the torque curve. Always size from the pull-out torque curve at your drive voltage.
Does microstepping increase accuracy?
Microstepping makes motion smoother and gives finer resolution, but accuracy is not improved in proportion. Each microstep produces only a small torque increment, so load torque can shift the actual position. Accuracy is mostly set by the motor's step accuracy and the load.
Further reading: How to select a stepper motor · Servo vs stepper · Servo and stepper motors
Other hybrid stepper motor series
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