Step Motor Nema 17 Two Phase 1.8degree Brake Stepper Motor
Specifications
Model | PST42H241-4L20M | PST42H249-4L20M | PST42H261-4L20M |
Holding Torque | 0.4N.m | 0.48N.m | 0.72N.m |
Related Current | 2A/Phase | 2A/Phase | 2A/Phase |
Resistance | 1.05Ω/Phase | 1.35Ω/Phase | 1.75Ω/Phase |
Inductance | 2MH/Phase | 2.9MH/Phase | 4MH/Phase |
Inertia | 54g.cm² | 77g.cm² | 100g.cm² |
Black Torque | 0.5N.m | 0.5N.m | 0.5N.m |
Product description of stepper motor
- The motor’s response to digital input pulses provides open-loop control, making the motor simpler and less costly to control.


Ti What is stepper motor?
- Stepper motor is an actuator transforming electric pulse into angular displacement. Popularly, when receiving a pulse signal, the stepper motor wi ll rotate a fixed angle (namely ''stepping angle'') according to the direction set for the stepper motor. The angular displacement volume can be c ontrolled by controlling the pulse number to achieve the purpose of positioning accurately. In the meantime, the rotational velocity and acceleration of motor can be controlled by controlling the pulse frequency to achieve the purpose of speed control.
General specifications
Specification | Motor Characteristics |
Insulation Class | Class B130°C |
Step Angle Accuracy | ±0.09° |
Withstand Voltage | AC500V (one minute) |
Insulation Resistance | 100MQ MIN. 500VDC |
Temperature Rise | 80*C MAX |
Radial Play | 0.025mm Max. (Load450g) |
Axial Play | 0.075mm Max. (Load950g) |
| Temperature | -10~+50°C (Non Condensing) |
Operating Environment | Humidity | 85%RH MAX. (Non Condensing) |
Medium | No corrosive gas or dust. Not directly in contact with water, oil, etc. |
Storage Environment | Temperature | 0~+50°C (Non Condensing |
Humidity | 85%RH MAX. (Non Condensing) |
Life | 5000 Hours MIN. |


The Advantages of Stepper Motors
- Not every application will benefit from a stepper motor, but in the right environment stepper motors can be ideal. First, stepper motors have full torque at standstill, and the rotation angle of the motor is proportional to the input pulse. Essentially, stepper motors offer excellent speed control, precise positioning, and repeatability of movement.
- Additionally, stepper motors are highly reliable since there are no contact brushes in the motor. This minimizes mechanical failure and maximizes the operation lifespan of the motor. These motors can be used in a wide range of environments, as many different rotational speeds can be achieved because the speed is proportional to the frequency of pulse inputs.
Applications of Stepper Motors
s stepper motors are diverse in their uses, but some of the most common include:
- 3D printing equipment
- Textile machines
- Printing presses
- Gaming machines
- Medical imaging machinery
- Small robotics
- CNC milling machines
- Welding equipment