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Overview

This NEMA 17-size pancake bipolar stepping motor from Sanyo features an integrated high-resolution (1000 P/R) quadrature encoder that allows for 4000 counts per revolution of the output shaft when counting both edges of both channels. The stepper motor itself has a 1.8° step angle (200 steps/revolution) and each phase draws 1 A at 3.5 V, allowing for a holding torque of 0.85 kg-cm (12 oz-in). The motor has four color-coded wires terminated with bare leads: red and yellow connect to one coil; orange 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 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.

This stepper motor is also available without an encoder.

Specifications

• Size: 42 mm square × 24.5 mm, not including the shaft (NEMA 17)
• Weight: 105 g (3.7 oz)
• Shaft diameter: 5 mm
• Steps per revolution: 200
• Current rating: 1 A per coil
• Voltage rating: 3.5 V
• Resistance: 3.5 ? per coil
• Holding torque: 850 g-cm (12 oz-in)
• Inductance: 1.2 mH per coil
• Lead length: 30 cm (12?)
• Output shaft supported by two ball bearings

More specifications are available in the SS242x stepper motor datasheet (385k pdf) and the product-specific SS2421-50XE100 datasheet (568k pdf).

Dimensions

We also carry a taller version of this stepper motor with identical dimensions except for the height. The pictures below show this stepper motor on the left and the taller version on the right:

Quadrature encoder

The integrated quadrature encoder operates from 5 V and has a resolution of 1000 P/R, which allows for 4000 counts per revolution (CPR) of the output shaft when counting both edges (i.e. rising and falling) of both channels (i.e. A and B). In addition to the A and B channel outputs, the encoder has a home channel, Z, that pulses once per revolution and can be used for absolute positioning. The encoder also has outputs for the inverse of A, B, and Z. A 15 cm (6?) encoder cable is included.

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

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