Stepper Motor: Unipolar/Bipolar, 200 Steps/Rev, 42×48mm, 4V, 1.2 A/Phase

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Pololu item #: 1200
Brand: SOYO
Status: Active and Preferred 
RoHS 3 compliant


This NEMA 17-size hybrid stepping motor can be used as a unipolar or bipolar stepper motor and has a 1.8° step angle (200 steps/revolution). Each phase draws 1.2 A at 4 V, allowing for a holding torque of 3.2 kg-cm (44 oz-in).

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Pictures

Stepper motor: unipolar/bipolar, 200 steps/rev, 42×48mm, 4V, 1200mA (SY42STH47-1206A).

Dimensions (in mm) of 42.3mm square stepper motors.

6-lead, unipolar/bipolar stepper motor wires are terminated with bare leads.

6-lead, unipolar/bipolar stepper motor wiring diagram.

5mm Pololu universal aluminum mounting hub on a stepper motor with a 5mm-diameter output shaft.

NEMA 17 stepper motor (item #1200) mounted with a Pololu stamped aluminum L-bracket for NEMA 17 stepper motors.

The inside of a bipolar stepper motor (SOYO NEMA 14-size).

Pololu’s assortment of stepper motors.




Overview

This hybrid stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 1.2 A at 4 V, allowing for a holding torque of 3.2 kg-cm (44 oz-in). The motor has six color-coded wires terminated with bare leads that allow it to be controlled by both unipolar and bipolar stepper motor drivers. When used with a unipolar stepper motor driver, all six leads are used. When used with a bipolar stepper motor driver, the center-tap yellow and white wires can be left disconnected (the red-blue pair gives access to one coil and the black-green pair gives access to the other coil). We recommend using it as a bipolar stepper motor and controlling it with one of our bipolar stepper motor drivers or one of our Tic Stepper Motor Controllers. In particular, the Tics make control easy because they support six different interfaces (USB, TTL serial, I²C, RC, analog voltages, and quadrature encoder) and are configurable over USB with our free configuration utility.

5mm Pololu universal aluminum mounting hub on a stepper motor with a 5mm-diameter output shaft.

NEMA 17 stepper motor (item #1200) mounted with a Pololu stamped aluminum L-bracket for NEMA 17 stepper motors.

6-lead, unipolar/bipolar stepper motor wires are terminated with bare leads.

6-lead, unipolar/bipolar stepper motor wiring diagram.

Our 5 mm universal mounting hub can be used to mount objects on the stepper motor’s 5 mm-diameter output shaft, and our NEMA 17 aluminum bracket offers a variety of options for mounting this stepper motor in your project. A similar NEMA17 stepper motor is available with a threaded rod output shaft that converts its rotations into linear motion of the included traveling nut.

Specifications

More specifications are available in the datasheet (189k pdf).

Dimensions

The following diagram shows the stepper motor dimensions in mm. The dimension labeled “length” is 48 mm. The output D-shaft has a 5 mm diameter with a section that is flattened by 0.5 mm. This shaft works with our 5 mm universal mounting hub.

The inside of a bipolar stepper motor (SOYO NEMA 14-size).

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:

Note: This stepper motor is SOYO part number SY42STH47-1206A.

Dimensions

Size: 42.3 mm square × 48 mm
(NEMA 17)1
NEMA size: 17
Weight: 350 g
Shaft diameter: 5 mm

General specifications

Shaft type: 5 mm "D"
Current rating: 1200 mA2
Voltage rating: 4 V
Holding torque: 44 oz·in
Steps per revolution: 200
Resistance: 3.3 Ohm2
Inductance per phase: 2.8 mH
Number of leads: 6
Lead length: 30 cm

Notes:

1
Not including the shaft.
2
Per coil.

File downloads

Frequently-asked questions

I want to control a 3.9 V, 600 mA bipolar stepper motor, but this driver has a minimum operating voltage above 3.9 V. Can I use this driver without damaging the stepper motor?

Yes. To avoid damaging your stepper motor, you want to avoid exceeding the rated current, which is 600 mA in this instance. All of our stepper motor drivers let you limit the maximum current, so as long as you set the limit below the rated current, you will be within spec for your motor, even if the voltage exceeds the rated voltage. The voltage rating is just the voltage at which each coil draws the rated current, so the coils of your stepper motor will draw 600 mA at 3.9 V. By using a higher voltage along with active current limiting, the current is able to ramp up faster, which lets you achieve higher step rates than you could using the rated voltage.

If you do want to use a lower motor supply voltage for other reasons, consider using our DRV8834 or STSPIN-220 low-voltage stepper motor drivers.

How do I connect my stepper motor to a bipolar stepper motor driver?
The answer to this question depends on the type of your stepper motor and how many wires it has. We have an application note that details possible methods for connecting stepper motors to bipolar drivers and controllers and the advantages and disadvantages of each option.

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