How to identify unipolar and bipolar stepper motor?

2023-02-02 17:39:02

Stepper motors are electric motors that can rotate in precise increments, or steps, rather than continuously. These motors are widely used in a variety of applications, including CNC routers, 3D printers, and other precision machines. There are two main types of stepper motors: unipolar and bipolar. In this article, we will explain how to identify these two types of stepper motors.

Subtitle: Unipolar Stepper Motors

Unipolar stepper motors have five or six wires and a center tap on each of the two phase windings. These motors are typically simpler to drive and are often used in low-power applications. To identify a unipolar stepper motor, look for the following characteristics:

  • Five or six wires
  • A center tap on each of the two phase windings
  • Wires that are typically labeled with numbers or colors

To determine the wire connections for a unipolar stepper motor, you can use a continuity tester or multimeter to test the resistance between the wires. For example, if you find that wires 1 and 3 have a resistance of zero when you touch the probes together, then these two wires are likely connected to the same phase winding.

Subtitle: Bipolar Stepper Motors

Bipolar stepper motors have four wires and do not have a center tap. These motors are typically more powerful and are often used in high-power applications. To identify a bipolar stepper motor, look for the following characteristics:

  • Four wires
  • No center tap on the phase windings
  • Wires that are typically labeled with numbers or colors

To determine the wire connections for a bipolar stepper motor, you can use a continuity tester or multimeter to test the resistance between the wires. For example, if you find that wires 1 and 3 have a resistance of zero when you touch the probes together, then these two wires are likely connected to the same phase winding.

In summary, unipolar stepper motors have five or six wires and a center tap on each of the two phase windings, while bipolar stepper motors have four wires and no center tap. By identifying the characteristics of these two types of stepper motors, you can choose the right motor for your application.

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