The Difference between Unipolar and Bipolar Stepper Motors

The working principle and characteristics of bipolar stepper motor

Bipolar stepper motor is a common stepper motor, and its working principle is to use the rotation of the magnetic field to control the rotation Angle and speed of the motor. The motor is characterized by the need for four control lines, which can realize front and back, left and right rotation, and the rotation Angle and speed can be accurately adjusted according to the size and frequency of the control voltage signal.

The advantages of bipolar stepper motor are sensitive dynamic response, high control accuracy, small error, and stable rotation performance. Therefore, bipolar stepper motors are widely used in printers, scanners, medical devices and other fields.

The working principle and characteristics of unipolar stepper motor

Unipolar stepper motor is another type of stepper motor, and its working principle is also to use the rotation of the magnetic field to control the rotation Angle and speed of the motor. Unlike bipolar stepper motors, unipolar stepper motors only require two control lines, can achieve one-way rotation, and the speed and Angle can be adjusted by controlling the pulse frequency of the signal.

The advantages of unipolar stepper motor are simple structure, less control circuit, low cost, high reliability and low noise. Therefore, the unipolar stepper motor is suitable for small size, low power demand, low control difficulty occasions, such as smart home, smart wearable devices and other fields.

The difference between bipolar stepper motor and unipolar stepper motor

As can be seen from the above introduction, the main difference between bipolar stepper motors and unipolar stepper motors is the number of control lines and rotation mode. The bipolar stepper motor needs four control lines, and the speed and Angle can be adjusted according to the size and frequency of the control signal. The unipolar stepper motor only needs two control lines, and the speed and Angle can be adjusted by the pulse frequency of the control signal.

In addition, bipolar stepper motors usually have higher rotation accuracy and stability, which is suitable for high-demand occasions. The unipolar stepper motor has the advantages of low cost, simple structure and high reliability, and is suitable for low requirements, but the speed is relatively slow.

In summary, bipolar stepper motor and unipolar stepper motor have their unique advantages and scope of application in practical applications, you can choose the right stepper motor according to specific needs.

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