Stepper Motor with 28cm Lead Screw: Bipolar, 200 Steps/Rev, 42×38mm, 2.8V, 1.7 A/Phase

Stepper Motor with 28cm Lead Screw: Bipolar, 200 Steps/Rev, 42×38mm, 2.8V, 1.7 A/Phase
Pololu item #: 2268 336 in stock

Price break Unit price (US$)
1 49.95
5 44.95


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This NEMA 17-size hybrid bipolar stepping motor has an integrated 28 cm (11″) threaded rod as its output shaft, turning it into a linear actuator capable of precision open-loop positioning. The included traveling nut has four mounting holes and moves 40 µm (1.6 mil) per full step; finer resolution can be achieved with microstepping. The stepper motor has a 1.8° step angle (200 steps/revolution) and each phase draws 1.7 A at 2.8 V, allowing for a holding torque of 3.7 kg-cm (51 oz-in).

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Stepper motor with 28cm lead screw: bipolar, 200 steps/rev, 42×38mm, 2.8V, 1.7 A/phase.
When the nut is prevented from rotating, it travels up or down the rod as the motor rotates.

Overview

This linear positioning drive consists of our 42×38 mm NEMA17 stepper motor with a built-in lead screw in place of the normal output shaft, which makes it easy to move an object or platform in a linear motion with the precision of a stepper motor. Motors like this are especially popular for use in home-built 3D printers (e.g. RepRap) and CNC machines. The stainless steel threaded rod extends 28 cm (11″) from the face of the stepper motor, and since it is integrated into the motor itself, you do not have to deal with bulky shaft couplers or loose set screws.

The included copper alloy traveling nut (also known as a carriage nut) features a mounting flange with four holes threaded for M3 screws. The nut moves 8.0 mm per full revolution of the lead screw, which allows for a linear resolution of 0.040 mm per full step of the stepper motor. Even smaller step sizes can be achieved through microstepping, which is a feature of many bipolar stepper motor drivers. We recommend the DRV8825 stepper motor driver carrier for use with this stepper motor, which allows for a linear resolution of 1.25 µm per 1/32 microstep.

The maximum achievable linear speed depends a lot on the details of the system, including the load and motor supply voltage. Under ideal conditions (e.g. with gradual ramping up of the step rate, a high supply voltage, and no load), we were able to achieve speeds close to 30 cm/s (12 in/s).

The stepper motor has a 1.8° step angle (200 steps/revolution) and each phase draws 1.7 A at 2.8 V, allowing for a holding torque of 3.7 kg-cm (51 oz-in). The motor has four color-coded wires terminated with a JST XHP-4 connector with 0.1" spacing: black and green connect to one coil; red and blue connect to the other. It can be controlled by a pair of suitable H-bridges (one for each coil), but we recommend using a bipolar stepper motor driver.

The JST XHP-4 connector that terminates the leads of the NEMA 17 stepper motor with 28cm lead screw.
Bipolar stepper motor wiring diagram.

Note: We can customize the shaft length for volume orders (at least a few dozen units). Please contact us for more information. Note that the manufacturer does not recommend cutting the lead screw to shorter lengths since the end is specially treated to prevent damage to the nut.

Specifications

  • Size: 42.3 mm square × 38 mm, not including the shaft (NEMA 17)
  • Weight: 385 g (13.5 oz)
  • Shaft diameter: 8 mm threaded rod
  • Shaft length: 28 cm (11″)
  • Steps per revolution: 200
  • Linear step size: 40 µm (1.6 mil) per full step
  • Current rating: 1.68 A per coil
  • Voltage rating: 2.8 V
  • Resistance: 1.65 Ω per coil
  • Holding torque: 3.7 kg-cm (51 oz-in)
  • Inductance: 3.2 mH per coil
  • Lead length: 16 cm (6.5″)

More specifications are available in the datasheet (63k pdf).

Dimensions

The following diagram shows the stepper motor, lead screw, and traveling nut dimensions in mm.

The inside of a bipolar stepper motor.

Stepper Motor Applications

Stepper motors are generally used in a variety of applications where precise position control is desirable and the cost or complexity of a feedback control system is unwarranted. Here are a few applications where stepper motors are often found:

  • Printers
  • CNC machines
  • 3D printer/prototyping machines (e.g. RepRap)
  • Laser cutters
  • Pick and place machines
  • Linear actuators
  • Hard drives

Note: This stepper motor is SOYO part number SY42STH38-1684A.

People often buy this product together with:

DRV8825 Stepper Motor Driver Carrier, High Current DRV8825 Stepper Motor Driver Carrier, High Current
0.1" (2.54mm) Crimp Connector Housing: 1x4-Pin 10-Pack 0.1" (2.54mm) Crimp Connector Housing: 1x4-Pin 10-Pack