A stepper motor is a type of electric motor that divides a full rotation into a series of equal steps. Each step corresponds to a fixed angle, allowing for precise control of rotation without the need for a separate encoder. Stepper motors are highly reliable for applications where position control is critical. They operate based on the principle of electromagnetism, where magnets inside the motor interact with a sequence of energized coils to rotate the rotor.

Stepper motors work by using a sequence of electrical pulses to move the rotor by fixed increments (steps). These steps give the motor its precision, with each step producing a set movement, typically between 0.9° and 1.8° per pulse. The rotor in the motor moves from one position to another without the need for continuous rotation, making it an excellent choice for applications that require high accuracy and reliability. There are two main types of stepper motors: unipolar and bipolar. Unipolar motors have a center-tapped coil, while bipolar motors have a coil with no center tap. Bipolar motors tend to be more powerful but require more complex control.

Using a stepper motor with Arduino is relatively straightforward. To connect the motor to Arduino, you’ll need a stepper motor driver (such as the A4988 or DRV8825) that controls the motor’s steps and direction. The Arduino sends control signals to the driver, which then powers the motor. Here is a basic example of using a stepper motor with Arduino:

 #include // Define number of steps per revolution #define STEPS 200 // Create stepper motor object Stepper myStepper(STEPS, 8, 9, 10, 11); void setup() { myStepper.setSpeed(60); // Set speed (RPM) } void loop() { myStepper.step(STEPS); // Move one revolution delay(1000); }

Stepper motors come in a variety of sizes, with the most common sizes being NEMA 17 and NEMA 23. These numbers refer to the motor’s mounting face dimensions in inches. For example, NEMA 17 motors have a 1.7-inch square mounting face, while NEMA 23 motors have a 2.3-inch square mounting face. The larger the motor, the more torque it can produce, but it will also require more power.

Common Stepper Motor Sizes

Size	Mounting Face	Typical Torque	Common Applications
NEMA 17	1.7 inches (43.2 mm)	30-80 Ncm	3D Printers, CNC Machines
NEMA 23	2.3 inches (57.2 mm)	80-200 Ncm	Robotics, Automation
NEMA 34	3.4 inches (86.4 mm)	200-800 Ncm	Heavy-duty CNC Machines, Large Robotics

There are several types of stepper motors available, each with its unique features and performance characteristics. These include:

1. Permanent Magnet Stepper (PM Stepper)

PM steppers are simple and inexpensive. They are often used in applications where low to medium torque is required. The rotor is made of a permanent magnet, and the stator contains electromagnets that are energized in sequence.

2. Variable Reluctance Stepper (VR Stepper)

VR steppers use a rotor made of soft magnetic material, which aligns with the energizing stator coils. They are known for precision and reliability but may not offer the same torque as PM steppers.

3. Hybrid Stepper Motor

Hybrid stepper motors combine the best features of both PM and VR motors. They are the most common type used in applications that require high performance, such as 3D printers and CNC machines.

4. Closed Loop Stepper Motor

Closed-loop stepper motors, also known as servo stepper motors, incorporate a feedback system to continuously monitor and adjust the motor’s performance. This feedback helps optimize the motor’s torque, speed, and efficiency, making it a more reliable choice for applications where precise motion control is critical. The feedback system ensures that the motor operates at peak performance, reducing issues like overheating and power consumption.

5. Integrated Stepper Motor

Integrated stepper motors combine the motor and driver into a single compact unit. This integration simplifies the setup process and reduces wiring complexity. They are often used in applications where space is limited, and ease of installation is a priority. While they offer convenience and compactness, they may have some limitations in terms of flexibility and customization compared to separate motor-driver setups.

6. Linear Stepper Motor

Linear stepper motors are designed to provide linear (straight-line) motion rather than rotational motion. They function similarly to traditional rotary stepper motors but instead move a carriage or load directly along a linear path. These motors are used in applications requiring precise and controlled linear movement, making them ideal for use in actuators, precision equipment, and robotic systems. Each type of stepper motor offers distinct advantages depending on the application. While permanent magnet stepper motors are simple and cost-effective, hybrid stepper motors combine the best features of PM and VR motors for high-performance needs. Closed-loop stepper motors enhance efficiency with feedback control, and integrated stepper motors offer convenience and space-saving designs. Linear stepper motors stand out when linear motion is required for applications like robotics and automated machines. When selecting the right stepper motor, consider factors like torque, precision, application requirements, and size limitations. Understanding the unique features of each type will help you make an informed decision that ensures optimal performance for your project.

Stepper Motor Comparison Table

Motor Type	Torque	Accuracy	Common Applications
Hybrid Stepper	High	Very High	3D Printers, CNC Machines, Robotics
Closed Loop Stepper	Medium to High	High	Industrial Automation, Robotics, Conveyor Systems
Integrated Stepper	Medium	Medium	Small Automated Systems, Cameras, Robotics
Permanent Magnet Stepper (PM)	Medium	Moderate	Printers, Robotics, Small Applications
Variable Reluctance Stepper (VR)	Low	High	Precision Machines, Medical Devices
Linear Stepper	Medium	Very High	Linear Actuators, Automated Machines, CNC

When selecting a stepper, consider the following factors:

• Torque: Choose a motor that provides the required torque for your application.
• Size: Ensure the motor fits within your design’s available space.
• Voltage and Current: Match the voltage and current ratings of the motor with the power supply and driver.
• Motor Driver: Select a compatible driver based on the motor type (e.g., bipolar or unipolar).
• Power Supply: The power supply should be able to provide sufficient voltage and current for the motor and driver.

Advantages:

• High precision and accuracy in positioning
• Reliable and stable performance without feedback systems
• Easy to control with microcontrollers like Arduino
• Available in a variety of sizes and torque ratings

Disadvantages:

• High power consumption at idle
• Can produce noise and vibration, especially at high speeds
• Lower efficiency compared to DC motors

Why Choose SSS-Motors Stepper Motors

• Wide selection of standard and customized stepper motors
• Stable torque output and reliable positioning accuracy
• Support for OEM customization and special applications
• Experienced engineering support for motor selection

If you are not sure which stepper motor is suitable for your application,
our technical team can help you select the right motor based on torque,
speed, voltage, and control requirements.

Stepper Motor Selection Guide

Choosing the right stepper motor depends on several factors including
required torque, operating speed, load characteristics, and control method.
You may explore our technical guides and comparison articles to better understand
the differences between various stepper motor types.

Browse our stepper motor products below or contact us for customized solutions.

If your stepper motor is making a squealing noise, it could be due to several factors, including incorrect driver settings, improper current settings, or mechanical issues. Visit our blog to learn more about how to troubleshoot and fix stepper motor squealing noises.

Stepper motors are widely used across various industries due to their ability to deliver precise motion control. Some of the most common applications include:

• 3D Printers
• Robotics
• CNC Machines
• Camera Systems
• Medical Devices
• Automated Systems