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20SG
Holry
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| Screw Specifications: | |
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NEMA8(20MM) Linear Actuator Description
The HOLRY' brand of hybrid Stepper Motor Linear Actuators come in five sizes, from 20 mm square to 86 mm square, corresponding to Nema size 8, size 11, size 14, size 17, size 23, and size 34. Each size has three to three form factors available - captive, non-captive and an external linear version.
There are over twenty different travels per step available, from. 0001563 inch (.00397 mm) to .003937 inch (1 mm). Microstepping can be used for even finer resolution.
The NEMA 8 Stepper Motor has an integrated threaded rod as its output shaft, turning it into a linear actuator capable of precision open loop positioning.
Features
Much easier to integrate into an application; can be coupled with programmable controllers/drivers.
Provide higher level of precision in motion control (speed, torque and force can be modified at different stages during movement).
Actuators are not susceptible to leakages or contamination - safer, cleaner and more convenient.
More economical in the long run, require less maintenance, are rugged and easy to operate / install, last longer and can be reliably used in different environmental conditions.
With simple quick connect wires and cable, actuators can be easily assembled, are more compact, and operate quietly.
Configurations
Kindly check our stepper motor catalog for full specifications.
Holry Stepper Motor Catalogue.pdf
The key differences between an external linear, non-captive, and captive motor is,
External | Non-captive | Captive |
  |  |  |
| The external linear motor has the screw affixed to the rotor, so it rotates external to motor body, like a DC motor. | The non captive screw travels freely in and out of the motor body and does not rotate. | The captive has a short screw that is held mostly inside the motor body, coupled to a spline. |
| External linear motors are most akin to motorized rails where the nut is replaced by a driven carriage assembly. Non captive is generally the shortest overall length assembly, while the captive is the longest. | ||
Trapezoidal (ACME) Lead Screw Options | ||||
| Diameter(mm) | Pitch(mm) | Lead(mm) | Starts | Step(mm) |
| 6 | 1 | 1 | 1 | 0.005 |
| 6 | 1.5 | 1.5 | 1 | 0.0075 |
| 6.35 | 0.794 | 0.794 | 1 | 0.00397 |
| 6.35 | 1.5875 | 3.175 | 2 | 0.015875 |
| 6.5 | 1.5 | 3 | 2 | 0.015 |
| 8 | 1 | 1 | 1 | 0.005 |
| 8 | 2 | 2 | 1 | 0.01 |
| 8 | 2 | 4 | 2 | 0.02 |
| 8 | 2 | 8 | 4 | 0.04 |
Stepper Motor Model
| Step Angle (°) | Motor Length L2(mm) | Rated Current (A) | Phase Resistance (Ω) | Phase Inductance (mH) | Holding Torque (Kg.cm) | Detent Torque (g.cm) | Rotor Inertia (g.cm⊃2;) | Lead Wire (NO.) |
28HB31F09SG | 1.8 | 31 | 0.95 | 2.8 | 0.8 | 0.8 | 15 | 9 | 4 |
28HB31F06SG | 1.8 | 31 | 0.68 | 5.6 | 3.4 | 0.6 | 15 | 9 | 4 |
28HB44F09SG | 1.8 | 44 | 0.95 | 3.4 | 1.2 | 1.2 | 35 | 12 | 4 |
28HB44F06SG | 1.8 | 44 | 0.68 | 6.8 | 4.9 | 0.95 | 35 | 11 | 4 |
28HB51F09SG | 1.8 | 51 | 0.95 | 4.6 | 1.8 | 1.5 | 50 | 18 | 4 |
28HB51F06SG | 1.8 | 51 | 0.68 | 9.2 | 7.2 | 1.2 | 50 | 18 | 4 |
End Machine Options | Screw Nut Options |
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| Please contact HOLRY for custom solutions. | |
Appilcations
FAQ
The stepper motor is an electromagnetic device that converts digital pulses into mechanical shaft rotation. Advantages of step motors are low cost, high reliability, high torque at low speeds and a simple, rugged construction that operates in almost any environment.
Stepper motors are so named because each pulse of electricity turns the motor one step. Stepper motors are controlled by a driver, which sends the pulses into the motor causing it to turn.
Step angle is defined as the angle through which the stepper motor shaft rotates for each command pulse.
If external force is applied to a stepping motor when it is stopped but energized, the attractive force generated between the rotor and stator works to maintain the stop position of the motor. This torque of withstanding the external force is called the holding torque.
The NEMA 8 Stepper Motor has an integrated threaded rod as its output shaft, turning it into a linear actuator capable of precision open loop positioning.
The HOLRY' brand of hybrid Stepper Motor Linear Actuators come in five sizes, from 20 mm square to 86 mm square, corresponding to Nema size 8, size 11, size 14, size 17, size 23, and size 34. Each size has three to three form factors available - captive, non-captive and an external linear version.
There are over twenty different travels per step available, from. 0001563 inch (.00397 mm) to .003937 inch (1 mm). Microstepping can be used for even finer resolution.
