Link here

Stepper Motor Specifications
NEMA 17 1.8 degree 200 steps-per-revolution four-phase unipolar permanent-magnet stepper-motor

microcontroller-projects:stepper-motors:stepper.jpeg The Mosaic stepper motor (part no. STEPMOT-1) is a four phase, unipolar, permanent magnet stepper motor. It is a standard size, 200-steps-per-revolution, NEMA 17 (1.7 in. square footprint, 5 mm shaft diameter), 12 V motor. This motor, like most stepper motors is a permanent magnet motor. The Mosaic stepper is typical of common high resolution motors – a full revolution requires 200 steps, while each step turns the shaft only 1.8° for a full step, or 0.9° in half-stepping mode. This sized motor is commonly used in household appliances, medical equipment, stage lighting devices, and in various industrial control applications.

The following are the specifications of the motor:

Stepper Motor Specifications
Mosaic Part No.: STEPMOT-1
Manufacturer Part No.: 42BYG228
Size: NEMA 17
Drive system: Unipolar
Step angle: 1.8° full step
0.9° half-step
Phase/Windings: 4/2
Voltage & Current: 12V at 400 mA
Resistance per Phase: 30 ohms
Inductance per Phase: 23 mH
Holding Torque: 2000 g-cm
Detent Torque: 220 g-cm max
Weight: 0.24 kg (0.5 lbs.)
Max continuous power: 5 W
Rotor Inertia: 22 g-cm2
Bearings: Ball
Leads: 18 in. 26 AWG UL 1007
Insulation resistance: >100 MΩ at 500VDC
Dielectric strength: 500V 50Hz/minute
Mounting hole space diagonal: 1.73 in.
Mounting screws: 3 mm dia.
0.5 mm pitch
Shaft diameter: 0.197 in. (5 mm)
Motor footprint: 1.7 in. × 1.7 in.
Motor height: 1.5 in.
Ambient temperature: -10°C to +55°C

The motor has six wires, connected to two split windings as is common for unipolar stepper motors:

Stepper motor winding diagram showing phases and wire colors.
Fig. 2  Stepper motor winding diagram showing phases and wire colors

In use, the center taps of the windings are typically wired to the positive supply, and the two ends of each winding are alternately grounded through a drive circuit to reverse the direction of the field provided by that winding. The Motor Wiring Diagram also illustrates the order of the stator poles in the motor: A, B, A’, B’. This is the order in which they must be energized to cause the motor to step in a specified direction (clockwise or counterclockwise).

The motor physical dimensions are shown in the following figure. The motor is 1.7” square, 1.5” long, with a 5 mm shaft. Mounting holes take 3 mm dia., 0.5 mm pitch metric screws. Four screws are installed in the back side of the motor. Two diagonally mounted screws are 40 mm long and extend 5.5 mm through the front side and two are 30 mm long and leave a 4.5 mm deep threaded socket in the front.

Stepper motor size and physical dimensions for a NEMA 17 stepper motor
Fig. 3  Size and physical dimensions of a NEMA 17 stepper motor
This page is about: Stepper Motor Specifications, NEMA 17 1.8 Degree 200 Steps-per-revolution Four-phase Unipolar Permanent-magnet Stepper-motor – Stepper motor specifications for a NEMA 17 four phase, 1.8 degree, 200 step per revolution, unipolar permanent magnet stepper motor for full stepping or half stepping. Stepper motor shaft diameter, stepper motor torque, stepper motor size, stepper motor winding current, stepper motor wire colors, center-tapped windings