Details for item #2689
The lead screw built into this stepper motor extends 18cm (7³) from the face of the stepper motor and weighs 352g (12.4oz). We also carry versions of this stepper motor with a 28cm and 38cm lead screw, and we also have the stepper motor available without a lead screw.
|
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—38mm 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: 18cm, 28cm, and 38cm.
|
NEMA 17-size stepper motors with 18, 28, and 38cm lead 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 8.0mm per full revolution of the lead screw, which allows for a linear resolution of 0.040mm 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 1.25micro;m 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 30cm/s (12in/s) with the 28cm lead screw version.
The stepper motor has a 1.8deg; step angle (200steps/revolution) and each phase draws 1.7A at 2.8V, allowing for a holding torque of 3.7kg-cm (51oz-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. |
---|
|
Our NEMA 17 aluminum bracket offers a variety of options for mounting this stepper motor in your project:
|
NEMA 17 stepper motor with lead screw mounted with a stamped aluminum L-bracket. |
---|
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: 42.3mmsquare—38mm, not including the shaft (NEMA 17)
- Leadscrew: Tr 8 — 8(P2)
- Steps per revolution: 200
- Linear step size: 40micro;m (1.6mil) per full step
- Current rating: 1.68A per coil
- Voltage rating: 2.8V
- Resistance: 1.65Omega; per coil
- Holding torque: 3.7kg-cm (51oz-in)
- Inductance: 3.2mH per coil
- Lead length: 16cm (6.5³)
- 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 28cm 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 182mm for the stepper motor with 18cm lead screw, 282mm for the stepper motor with 28cm lead screw, and 382mm for the stepper motor with 38cm lead screw. Note that the datasheet incorrectly labels the threaded rod as #8220;TR8—3#8221;; it is really a Tr8—8(P2) leadscrew, which is the ISO designation for a trapezoidal metric thread with an 8mm nominal diameter, 8mm lead, and 2mm pitch. (Put more simply, the rod has four independent threads spaced 2mm apart, so the carriage nut advances 8mm for each full revolution of the rod.)
|
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.