2689-POLOLU Stepper Motor with 18cm Lead Screw: Bipolar, 200 Steps/Rev, 42×38mm, 2.8V, 1.7 A/Phase

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2689-POLOLU
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2689-POLOLU Stepper Motor with 18cm Lead Screw: Bipolar, 200 Steps/Rev, 42×38mm, 2.8V, 1.7 A/Phase

This NEMA 17-size hybrid bipolar stepping motor has an integrated 18 cm (7″) 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).

The lead screw built into this stepper motor extends 18 cm (7″) from the face of the stepper motor and weighs 352 g (12.4 oz). We also carry versions of this stepper motor with a 28 cm and 38 cm lead screw, and we also have the stepper motor available without a lead screw.

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 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. This stepper motor comes in three versions with different length lead screws built in: 18 cm, 28 cm, and 38 cm.

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 or AMIS-30543 stepper motor driver carrier for use with this stepper motor, which allow for a linear resolution of 1.25 µm per 1/32 microstep. However, please note that the nut is not spring loaded, so changes in direction will result in loss of positioning precision due to backlash. Extra traveling nuts are also available for purchase separately.

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) with the 28 cm lead screw version.

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.

Our NEMA 17 aluminum bracket offers a variety of options for mounting this stepper motor in your project.

Note: We can customize the shaft length for volume orders (at least a few dozen units). Please contact us for more information. While you might be tempted to cut the lead screw to shorter lengths yourself, this is something we advise against since the manufacturer specially treats the end of the lead screw to protect the nut.

Specifications

  • Size: 42.3 mm square × 38 mm, not including the shaft (NEMA 17)
  • Leadscrew: Tr 8 × 8(P2)
  • 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″)
  • Output shaft supported by two ball bearings

More specifications are available in the datasheet (63k pdf). Note that while the datasheet is for the stepper motor with 28 cm lead screw, the only difference between the three versions is the length of the lead screw.

Dimensions

The following diagram shows the stepper motor, lead screw, and traveling nut dimensions in mm. The value of L is 182 mm for the stepper motor with 18cm lead screw, 282 mm for the stepper motor with 28cm lead screw, and 382 mm for the stepper motor with 38cm lead screw. Note that the datasheet incorrectly labels the threaded rod as “TR8×3”; it is really a Tr8×8(P2) leadscrew, which is the ISO designation for a trapezoidal metric thread with an 8 mm nominal diameter, 8 mm lead, and 2 mm pitch. (Put more simply, the rod has four independent threads spaced 2 mm apart, so the carriage nut advances 8 mm for each full revolution of the rod.)

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

 

Product
Size
NEMA size
Weight
(g)
Shaft diameter (mm)
Shaft type
Steps per revolution
Current rating (A)
Voltage rating (V)
2690-POLOLU Stepper Motor with 38cm Lead Screw: Bipolar, 200 Steps/Rev, 42×38mm, 2.8V, 1.7 A/Phase 42.3 mm square × 38 mm
(NEMA 17)1
17 4152 8 38 cm threaded rod3 200 1.684 2.8
2689-POLOLU Stepper Motor with 18cm Lead Screw: Bipolar, 200 Steps/Rev, 42×38mm, 2.8V, 1.7 A/Phase 42.3 mm square × 38 mm
(NEMA 17)1
17 3552 8 18 cm threaded rod3 200 1.684 2.8
2299-POLOLU Sanyo Pancake Stepper Motor: Bipolar, 200 Steps/Rev, 50×16mm, 5.9V, 1 A/Phase 50 mm square × 16 mm1   150 5   200 14 5.9
2268-POLOLU Stepper Motor with 28cm Lead Screw: Bipolar, 200 Steps/Rev, 42×38mm, 2.8V, 1.7 A/Phase 42.3 mm square × 38 mm
(NEMA 17)1
17 3852 8 28 cm threaded rod3 200 1.684 2.8
2267-POLOLU Stepper Motor: Bipolar, 200 Steps/Rev, 42×38mm, 2.8V, 1.7 A/Phase 42.3 mm square × 38 mm
(NEMA 17)1
17 285 5 5 mm "D" 200 1.684 2.8
1474-POLOLU Stepper Motor: Bipolar, 200 Steps/Rev, 57×56mm, 2.5V, 2.8 A/Phase 56.4 mm square × 56 mm1 23 700 6.35 1/4 inch "D" 200 2.84 2.5
1473-POLOLU Stepper Motor: Unipolar/Bipolar, 200 Steps/Rev, 57×56mm, 3.6V, 2 A/Phase 56.4 mm square × 56 mm1 23 700 6.35 1/4 inch "D" 200 24 3.6
1472-POLOLU Stepper Motor: Unipolar/Bipolar, 200 Steps/Rev, 57×56mm, 7.4V, 1 A/Phase 56.4 mm square × 56 mm1 23 700 6.35 1/4 inch "D" 200 14 7.4
1475-POLOLU Stepper Motor: Unipolar/Bipolar, 200 Steps/Rev, 57×76mm, 4.5V, 2 A/Phase 56.4 mm square × 76 mm1 23 1000 6.35 1/4 inch "D" 200 24 4.5
1478-POLOLU Stepper Motor: Bipolar, 200 Steps/Rev, 57×76mm, 3.2V, 2.8 A/Phase 56.4 mm square × 76 mm1 23 1000 6.35 1/4 inch "D" 200 2.84 3.2
1477-POLOLU Stepper Motor: Unipolar/Bipolar, 200 Steps/Rev, 57×76mm, 8.6V, 1 A/Phase 56.4 mm square × 76 mm1 23 1000 6.35 1/4 inch "D" 200 14 8.6
1476-POLOLU Stepper Motor: Unipolar/Bipolar, 200 Steps/Rev, 57×41mm, 5.7V, 1 A/Phase 56.4 mm square × 41 mm1 23 450 6.35 1/4 inch "D" 200 14 5.7
2298-POLOLU Sanyo Pancake Stepper Motor: Bipolar, 200 Steps/Rev, 42×11.6mm, 3.5V, 1 A/Phase 42 mm square × 11.6 mm1   70 5   200 14 3.5
2297-POLOLU Sanyo Pancake Stepper Motor: Bipolar, 200 Steps/Rev, 50×11mm, 4.5V, 1 A/Phase 50 mm square × 11 mm1   90 5   200 14 4.5
2296-POLOLU Sanyo Pancake Stepper Motor: Bipolar, 200 Steps/Rev, 42×18.6mm, 5.4V, 1 A/Phase 42 mm square × 18.6 mm1   140 5   200 14 5.4
2295-POLOLU Sanyo Miniature Stepper Motor: Bipolar, 200 Steps/Rev, 14×30mm, 6.3V, 0.3 A/Phase, Double Shaft 14mm square × 30 mm5   28 4 Double shaft 200 0.36 6.3
2294-POLOLU Sanyo Miniature Stepper Motor: Bipolar, 200 Steps/Rev, 14×30mm, 6.3V, 0.3 A/Phase 14 mm square × 30 mm5   27 4 Single shaft 200 0.36 6.3
1200-POLOLU Stepper Motor: Unipolar/Bipolar, 200 Steps/Rev, 42×48mm, 4V, 1.2 A/Phase 42.3 mm square × 48 mm
(NEMA 17)1
17 350 5 5 mm "D" 200 1.24 4
1209-POLOLU Stepper Motor: Bipolar, 200 Steps/Rev, 35×36mm, 2.7V, 1 A/Phase 35 mm square × 36 mm1 14 180 5 5 mm "D" 200 14 2.7
1208-POLOLU Stepper Motor: Bipolar, 200 Steps/Rev, 35×28mm, 10V, 0.5 A/Phase 35 mm square × 28 mm1 14 140 5 5 mm "D" 200 0.54 10
1207-POLOLU Stepper Motor: Bipolar, 200 Steps/Rev, 35×26mm, 7.4V, 0.28 A/Phase 35 mm square × 26 mm1 14 130 5 5 mm "D" 200 0.284 7.4
1206-POLOLU Stepper Motor: Bipolar, 200 Steps/Rev, 28×45mm, 4.5V, 0.67 A/Phase 28 mm square × 45 mm1 11 140 5 5 mm "D" 200 0.674 4.5
1205-POLOLU Stepper Motor: Bipolar, 200 Steps/Rev, 28×32mm, 3.8V, 0.67 A/Phase 28 mm square × 32 mm1 11 110 5 5 mm "D" 200 0.674 3.8
1204-POLOLU Stepper Motor: Bipolar, 200 Steps/Rev, 20×30mm, 3.9V, 0.6 A/Phase 20 mm square × 30 mm1 8 60 4 4 mm "D" 200 0.64 3.9

 

Notes:

1. Not including the shaft.
2. This measurement includes the traveling nut, which adds 11.6 g (0.41 oz).
3. ISO definition of thread characteristics: Tr 8 × 8(P2) – trapezoidal thread, 8 mm diameter, 8 mm lead, 2 mm pitch.
4. Per coil.

 

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